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MAX538BEPA

hot MAX538BEPA

MAX538BEPA

For Reference Only

Part Number MAX538BEPA
Manufacturer Maxim Integrated
Description IC DAC SERIAL +5V LP 12BIT 8-DIP
Datasheet MAX538BEPA Datasheet
Package 8-DIP (0.300", 7.62mm)
In Stock 218 piece(s)
Unit Price Request a Quote
Lead Time Can Ship Immediately
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MAX538BEPA

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MAX538BEPA Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - Data Acquisition - Digital to Analog Converters (DAC)
Datasheet MAX538BEPA Datasheet
Package8-DIP (0.300", 7.62mm)
Series-
Number of Bits12
Number of D/A Converters1
Settling Time25µs (Typ)
Output TypeVoltage - Buffered
Differential OutputNo
Data InterfaceSPI
Reference TypeExternal
Voltage - Supply, Analog5V
Voltage - Supply, Digital5V
INL/DNL (LSB)±1 (Max), ±1 (Max)
ArchitectureR-2R
Operating Temperature-40°C ~ 85°C
Package / Case8-DIP (0.300", 7.62mm)
Supplier Device Package8-PDIP

MAX538BEPA Datasheet

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_______________General Description The MAX531/MAX538/MAX539 are low-power, voltage- output, 12-bit digital-to-analog converters (DACs) speci- fied for single +5V power-supply operation. The MAX531 can also be operated with ±5V supplies. The MAX538/MAX539 draw only 140µA, and the MAX531 (with internal reference) draws only 260µA. The MAX538/MAX539 come in 8-pin DIP and SO packages, while the MAX531 comes in 14-pin DIP and SO pack- ages. All parts have been trimmed for offset voltage, gain, and linearity, so no further adjustment is necessary. The MAX538’s buffer is fixed at a gain of +1 and the MAX539’s buffer at a gain of +2. The MAX531’s internal op amp may be configured for a gain of +1 or +2, as well as for unipolar or bipolar output voltages. The MAX531 can also be used as a four-quadrant multiplier without external resistors or op amps. For parallel data inputs, see the MAX530 data sheet. _______________________Applications Battery-Powered Test Instruments Digital Offset and Gain Adjustment Battery-Operated/Remote Industrial Controls Machine and Motion Control Devices Cellular Telephones ___________________________Features ♦ Operate from Single +5V Supply ♦ Buffered Voltage Output ♦ Internal 2.048V Reference (MAX531) ♦ 140µA Supply Current (MAX538/MAX539) ♦ INL = ±1/2LSB (max) ♦ Guaranteed Monotonic over Temperature ♦ Flexible Output Ranges: 0V to VDD (MAX531/MAX539) VSS to VDD (MAX531) 0V to 2.6V (MAX531/MAX538) ♦ 8-Pin SO/DIP (MAX538/MAX539) ♦ Power-On Reset ♦ Serial Data Output for Daisy-Chaining ______________Ordering Information M A X 5 3 1 /M A X 5 3 8 /M A X 5 3 9 +5V, Low-Power, Voltage-Output, Serial 12-Bit DACs ________________________________________________________________ Maxim Integrated Products 1 1 2 3 4 8 7 6 5 VDD VOUT REFIN AGNDDOUT CS SCLK DIN DIP/SO TOP VIEW MAX538 MAX539 _________________Pin Configurations ________________Functional Diagram For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 19-0172; Rev 6; 2/97 PART TEMP. RANGE PIN-PACKAGE MAX531ACPD 0°C to +70°C 14 Plastic DIP MAX531BCPD 0°C to +70°C 14 Plastic DIP MAX531ACSD 0°C to +70°C 14 SO MAX531BCSD 0°C to +70°C 14 SO ERROR (LSB) ±1/2 ±1 ±1/2 ±1 DAC DAC REGISTER (12 BITS) SHIFT REGISTER (12 BITS) 4 BITS CONTROL LOGIC POWER-UP RESET 2.048V REFERENCE (MAX531 ONLY) AGND SCLK DIN (MAX531 ONLY) REFOUT REFIN (MAX531 ONLY) BIPOFF RFB (MAX531 ONLY) VOUT VDD DGND (MAX531 ONLY) VSS (MAX531 ONLY) DOUT (LSB) (MSB) CLR (MAX531 ONLY) CS MAX531 MAX538 MAX539 MAX531BC/D 0°C to +70°C Dice* ±1 Ordering Information continued at end of data sheet. *Dice are specified at TA = +25°C only. Pin Configurations continued at end of data sheet.

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M A X 5 3 1 /M A X 5 3 8 /M A X 5 3 9 +5V, Low-Power, Voltage-Output Serial 12-Bit DACs 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS VDD to DGND and VDD to AGND ................................-0.3V, +6V VSS to DGND and VSS to AGND .................................-6V, +0.3V VDD to VSS .................................................................-0.3V, +12V AGND to DGND........................................................-0.3V, +0.3V Digital Input Voltage to DGND ......................-0.3V, (VDD + 0.3V) REFIN ..................................................(VSS - 0.3V), (VDD + 0.3V) REFOUT to AGND .........................................-0.3V, (VDD + 0.3V) RFB .....................................................(VSS - 0.3V), (VDD + 0.3V) BIPOFF................................................(VSS - 0.3V), (VDD + 0.3V) VOUT (Note 1) ................................................................VSS, VDD Continuous Current, Any Pin................................-20mA, +20mA Continuous Power Dissipation (TA = +70°C) 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)....727mW 8-Pin SO (derate 5.88mW/°C above +70°C) ................471mW 14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)...800mW 14-Pin SO (derate 8.33mW/°C above +70°C) ..............667mW Operating Temperature Ranges MAX53_ _C_ _ .....................................................0°C to +70°C MAX53_ _E_ _ ..................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +165°C Lead Temperature (soldering, 10sec) .............................+300°C ELECTRICAL CHARACTERISTICS—Single +5V Supply (VDD = +5V ±10%, VSS = 0V, AGND = DGND = 0V, REFIN = 2.048V (external), RFB = BIPOFF = VOUT (MAX531), CREFOUT = 33µF (MAX531), RL = 10kΩ , CL = 100pF, TA = TMIN to TMAX, unless otherwise noted.) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. PARAMETER SYMBOL MIN TYP MAX UNITS Unipolar Offset Error VOS 0 8 LSB Differential Nonlinearity DNL ±1 LSB Relative Accuracy (Note 2) INL LSB ±1 Unipolar Offset Tempco TCVOS 3 ppm/°C Gain Error (Note 2) GE ±1 LSB Resolution N 12 Bits ±0.5 Gain-Error Tempco 1 ppm/°C Power-Supply Rejection Ratio (Note 3) PSRR 0.4 1 LSB/V 0 VDD - 2 Output Voltage Range 0 VDD - 0.4 V Output Load Regulation 1 LSB Short-Circuit Current ISC 12 mA Voltage Range 0 VDD - 2 V Input Resistance 40 kΩ Input Capacitance 10 50 pF AC Feedthrough -80 dB CONDITIONS MAX53_ _C/E Guaranteed monotonic 4.5V ≤ VDD ≤ 5.5V MAX53_ _C/E MAX531 (G = +1), MAX538 MAX531 (G = +2), MAX539 VOUT = 2V, RL = 2kΩ Code dependent, minimum at code 555 hex Code dependent (Note 4) REFIN = 1kHz, 2Vp-p Note 1: The output may be shorted to VDD, VSS, or AGND if the package power dissipation limit is not exceeded. MAX53_AC/E MAX53_BC/E REFERENCE INPUT (REFIN) VOLTAGE OUTPUT (VOUT) STATIC PERFORMANCE

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M A X 5 3 1 /M A X 5 3 8 /M A X 5 3 9 +5V, Low-Power, Voltage-Output, Serial 12-Bit DACs _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS—Single +5V Supply (continued) (VDD = +5V ±10%, VSS = 0V, AGND = DGND = 0V, REFIN = 2.048V (external), RFB = BIPOFF = VOUT (MAX531), CREFOUT = 33µF (MAX531), RL = 10kΩ , CL = 100pF, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER Input Current SYMBOL MIN TYP MAX IIN ±1 UNITS Noise Voltage en µA 400 Input Capacitance CIN µVp-p Power-Supply Rejection Ratio 8 PSRR 300 µV/V Resistance RREFOUT 0.5 2 pF Ω Temperature Coefficient TCREFOUT 30 50 ppm/°C Minimum Required External Capacitor CMIN 3.3 µF Output High Input High VOH VIH 2.4 VDD - 1 V Input Low V VIL 0.8 V Output Low VOL 0.4 V Voltage-Output Slew Rate SR 0.15 0.25 V/µs Voltage-Output Settling Time 25 µs Digital Feedthrough 2.024 2.048 2.072 5 nV-s Signal-to-Noise plus Distortion SINAD 68 dB 260 400 CONDITIONS VIN = 0V or VDD 0.1Hz to 10kHz 4.5V ≤ VDD ≤ 5.5V (Note 5) MAX531AC/AE/AM/BM ISOURCE = 2mA ISINK = 2mA TA = +25°C To ±1/2LSB, VOUT = 2V CS = VDD, DIN = 100kHz REFIN = 1kHz, 2Vp-p (G = +1 or +2), code = FFF hex Power-Supply Current IDD All inputs = 0V or VDD, output = no load 140 300 µA CS Setup Time tCSS 20 ns SCLK Fall to CS Fall Hold Time tCSH0 15 ns SCLK Fall to CS Rise Hold Time tCSH1 0 ns SCLK High Width tCH 35 ns SCLK Low Width tCL 35 ns DIN Setup Time tDS 45 ns DIN Hold Time tDH 0 ns DOUT Valid Propagation Delay tDO CL = 50pF 80 ns CS High Pulse Width tCSW 20 ns CLR Pulse Width tCLR 25 ns MAX531BC/BE MAX531 MAX538, MAX539 30 2.017 2.079Reference Output Voltage V 2.013 2.083 VDD = 5.0V CS Rise to SCLK Rise Setup Time tCS1 50 ns TA = +25°C MAX531BC MAX531BE Positive Supply Voltage VDD 4.5 5.5 V REFERENCE OUTPUT (REFOUT—MAX531 only) DIGITAL INPUTS (DIN, SCLK, CS, CLR) DIGITAL OUTPUT (DOUT) DYNAMIC PERFORMANCE POWER SUPPLY SWITCHING CHARACTERISTICS

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M A X 5 3 1 /M A X 5 3 8 /M A X 5 3 9 +5V, Low-Power, Voltage-Output, Serial 12-Bit DACs 4 _______________________________________________________________________________________ PARAMETER SYMBOL MIN TYP MAX UNITS Bipolar Offset Error VOS ±8 Gain Error (Unipolar or Bipolar) GEU LSB Differential Nonlinearity ±1 DNL ±1 LSB Relative Accuracy INL LSB LSB ±1 Gain-Error Tempco Bipolar Offset Tempco TCVOS 3 ppm/°C 1 ppm/°C Power-Supply Rejection Ratio (Note 3) PSRR 0.4 1 LSB/V Voltage Range Resolution VSS + 2 VDD - 2 N 12 V Input Resistance Bits 40 kΩ Input Capacitance ±0.5 10 50 pF AC Feedthrough -80 dB CONDITIONS BIPOFF = REFIN, MAX531_C/E MAX531_C/E Guaranteed monotonic Tested at VDD = 5V, VSS = -5V BIPOFF = REFIN 4.5V ≤ VDD ≤ 5.5V, -5.5V ≤ VSS ≤ -4.5V Code dependent, minimum at code 555 hex Code dependent (Note 4) REFIN = 1kHz, 2.0Vp-p ELECTRICAL CHARACTERISTICS—Dual Supplies (MAX531 Only) (VDD = +5V ±10%, VSS = -5V ±10%, AGND = DGND = 0V, REFIN = 2.048V (external), RFB = BIPOFF = VOUT, CREFOUT = 33µF, RL = 10kΩ , CL = 100pF, TA = TMIN to TMAX, unless otherwise noted.) MAX531AC/E MAX531BC/E 2.024 2.048 2.072 MAX531AC/AE/AM/BM 30 50 Temperature Coefficient TCREFOUT MAX531BC/BE 30 ppm/°C Resistance RREFOUT (Note 5) 0.5 2 Ω Power-Supply Rejection Ratio PSRR 4.5V ≤ VDD ≤ 5.5V 300 µV/V en 0.1Hz to 10kHz 400 µVp-pNoise Voltage Minimum Required External Capacitor CMIN 3.3 µF Input High VIH 2.4 V Input Low VIL 0.8 V Input Current IIN VIN = 0V or VDD ±1 µA Input Capacitance CIN 8 pF Output High VOH ISOURCE = 2mA VDD - 1 V Output Low VOL ISINK = 2mA 0.4 V 2.017 2.079VDD = 5.0V 2.013 2.083 VReference Output Voltage TA = +25°C MAX531BC MAX531BE REFERENCE INPUT (REFIN) REFERENCE OUTPUT (REFOUT—MAX531 only) DIGITAL INPUTS (DIN, SCLK, CS) DIGITAL OUTPUT (DOUT)

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M A X 5 3 1 /M A X 5 3 8 /M A X 5 3 9 +5V, Low-Power, Voltage-Output, Serial 12-Bit DACs _______________________________________________________________________________________ 5 Note 2: In single-supply operation, INL and GE calculated from code 11 to code 4095. Tested at VDD = +5V. Note 3: This specification applies to both gain-error power-supply rejection ratio and offset-error power-supply rejection ratio. Note 4: Guaranteed by design. Note 5: Tested at IOUT = 100µA. The reference can typically source up to 5mA (see Typical Operating Characteristics). ELECTRICAL CHARACTERISTICS—Dual Supplies (MAX531 Only) (continued) (VDD = +5V ±10%, VSS = -5V ±10%, AGND = DGND = 0V, REFIN = 2.048V (external), RFB = BIPOFF = VOUT, CREFOUT = 33µF, RL = 10kΩ , CL = 100pF, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL MIN TYP MAX UNITS Voltage-Output Slew Rate SR dB 0.15 0.25 VDD V/µs 4.5 5.5 ISC 12 V mA Positive Supply Voltage 1 LSB Negative Supply Voltage Voltage-Output Settling Time 25 µs Signal-to-Noise plus Distortion 5 nV-s VSS -5.5 0 V Short-Circuit Current 68 Digital Feedthrough SINAD 68 Output Load Regulation VSS + 2 VDD - 2 Output Voltage Range VSS + 0.4 VDD - 0.4 V CONDITIONS VOUT = 2V, RL = 2kΩ To ±1/2LSB, VOUT = 2V Step 000 hex to FFF hex REFIN = 1kHz, 2Vp-p, (G = +1) REFIN = 1kHz, 2Vp-p, (G = +2) MAX531 (G = +1) MAX531 (G = +2) CS Setup Time tCSS 20 ns SCLK Fall to CS Fall Hold Time tCSH0 15 ns SCLK Fall to CS Rise Hold Time tCSH1 0 ns SCLK High Width tCH 35 ns SCLK Low Width tCL 35 ns DIN Setup Time tDS 45 ns DIN Hold Time tDH 0 ns DOUT Valid Propagation Delay tDO CL = 50pF 80 ns CS High Pulse Width tCSW 20 ns CLR Pulse Width tCLR 25 ns CS Rise to SCLK Rise Setup Time tCS1 50 ns Positive Supply Current IDD 260 400 µAAll inputs = 0V or VDD, no load Negative Supply Current ISS -120 -200 µAAll inputs = 0V or VDD, no load VOLTAGE OUTPUT (VOUT) DYNAMIC PERFORMANCE POWER SUPPLY SWITCHING CHARACTERISTICS

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M A X 5 3 1 /M A X 5 3 8 /M A X 5 3 9 +5V, Low-Power, Voltage-Output, Serial 12-Bit DACs 6 _______________________________________________________________________________________ 120 -60 SUPPLY CURRENT vs. TEMPERATURE 140 M A X 5 3 1 -7 TEMPERATURE (°C) S U P P L Y C U R R E N T ( µA ) 60 240 180 -20 20 80 300 -40 0 40 100 280 260 220 200 160 MAX538/MAX539 MAX531 4 -14 1 100 100k MAX531 GAIN vs. FREQUENCY -12 M A X 5 3 1 -8 FREQUENCY (Hz) G A IN ( d B ) -8 -4 0 2 -2 -6 -10 1k 10k REFIN = 4Vp-p 80 0 10 1k 100k MAX531 AMPLIFIER SIGNAL-TO-NOISE RATIO 10 M A X 5 3 1 -9 FREQUENCY (Hz) S IG N A L -T O -N O IS E R A T IO ( d B ) 20 40 60 30 50 70 10k100 REFIN = 4Vp-p 2.055 2.045 -60 MAX531 REFERENCE VOLTAGE vs. TEMPERATURE M A X 5 3 1 -6 TEMPERATURE (°C) R E FE R E N C E V O L T A G E ( V ) 60 2.050 -20 20 80 100400-40 -110 0 1 10 1k 100k ANALOG FEEDTHROUGH vs. FREQUENCY -30 -70 M A X 5 3 1 -5 FREQUENCY (Hz) A N A L O G F E E D T H R O U G H ( d B ) 100 10k 1M -100 -90 -80 -60 -50 -40 -20 -10 CODE = 000 hex 2 8 VDD-5 VDD-1 OUTPUT SOURCE CAPABILITY vs. OUTPUT PULL-UP VOLTAGE 7 3 M A X 5 3 1 -4 OUTPUT PULL-UP VOLTAGE (V) O U T P U T S O U R C E C A P A B IL IT Y ( m A ) VDD-2 5 6 VDD-4 VDD-3 4 VDD-0 1 0 0.25 -1.25 0 12 INTEGRAL NONLINEARITY vs. DIGITAL INPUT CODE (FIRST 12 CODES) -1.00 M A X 5 3 1 -1 DIGITAL INPUT CODE (DECIMAL) IN T E G R A L N O N L IN E A R IT Y ( L S B ) 8 -0.50 -0.75 -0.25 2 6 10 0 4 DUAL SUPPLIES SINGLE SUPPLY INTEGRAL NONLINEARITY vs. DIGITAL INPUT CODE (ALL CODES) 0 512 1024 1536 2048 2560 3072 3584 4095 -0.25 0 0.25 IN T E G R A L N O N L IN E A R IT Y ( L S B ) DIGITAL INPUT CODE (DECIMAL) 12 0 0 0.8 OUTPUT SINK CAPABILITY vs. OUTPUT PULL-DOWN VOLTAGE 2 10 M A X 5 3 1 -3 OUTPUT PULL-DOWN VOLTAGE (V) O U T P U T S IN K C A P A B IL IT Y ( m A ) 0.6 6 4 0.2 0.4 8 1.0 14 16 __________________________________________Typical Operating Characteristics (VDD = +5V, VREFIN = 2.048V, TA = +25°C, unless otherwise noted.)

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M A X 5 3 1 /M A X 5 3 8 /M A X 5 3 9 +5V, Low-Power, Voltage-Output, Serial 12-Bit DACs _______________________________________________________________________________________ 7 ____________________________Typical Operating Characteristics (continued) (VDD = +5V, VREFIN = 2.048V, TA = +25°C, unless otherwise noted.) 20 -30 1 MAX531 GAIN AND PHASE vs. FREQUENCY -10 10 M A X 5 3 1 -1 0 FREQUENCY (kHz) G A IN ( d B ) 10 100 0 -20 800 -180 0 180 GAIN PHASE RFB CONNECTED TO AGND (G=2) RFB CONNECTED TO VOUT (G=1) P H A S E ( d eg re es ) 2.0520 2.0490 0 5.0 MAX531 REFERENCE OUTPUT VOLTAGE vs. REFERENCE LOAD CURRENT 2.0495 2.0515 M A X 5 3 1 -1 4 REFERENCE LOAD CURRENT (mA) R E FE R E N C E O U T P U T ( V ) 3.0 2.0505 2.0500 1.0 2.0 4.0 2.0510 0.5 1.5 2.5 3.5 4.5 VDD = ±5V, VREFIN = 2V, BIPOLAR CONFIGURATION A: CS RISING EDGE, 5V/div B: VOUT, NO LOAD, 1V/div A B NEGATIVE SETTLING TIME (MAX531) 5µs/div DIGITAL FEEDTHROUGH A B CS = HIGH A: DIN = 4Vp-p, 100kHz B: VOUT, 10mV/div 2µs/div A B POSITIVE SETTLING TIME (MAX531) VDD = ±5V, VREFIN = 2V, BIPOLAR CONFIGURATION A: CS RISING EDGE, 5V/div B: VOUT, NO LOAD, 1V/div 5µs/div

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M A X 5 3 1 /M A X 5 3 8 /M A X 5 3 9 +5V, Low-Power, Voltage-Output Serial 12-Bit DACs 8 _______________________________________________________________________________________ 10 FUNCTION 1 BIPOFF Bipolar Offset/Gain Resistor 2 DIN Serial Data Input 3 CLR Clear. Asynchronously sets DAC register to 000 hex. PIN — 1 4 SCLK Serial Clock Input 5 CS Chip Select, active low 6 DOUT Serial Data Output for daisy-chaining 7 DGND Digital Ground — 2 3 8 AGND Analog Ground 9 REFIN Reference Input 4 — 5 6 — REFOUT Reference Output, 2.048V 11 — VSS Negative Power Supply 12 7 VOUT DAC Output 13 8 VDD Positive Power Supply 14 — RFB Feedback Resistor MAX531 MAX538 MAX539 NAME ____________________Pin Description _______________Detailed Description General DAC Discussion The MAX531/MAX538/MAX539 use an “inverted” R-2R ladder network with a single-supply CMOS op amp to con- vert 12-bit digital data to analog voltage levels (see Functional Diagram). The term “inverted” describes the ladder network because the REFIN pin in current-output DACs is the summing junction, or virtual ground, of an op amp. However, such use would result in the output voltage being the inverse of the reference voltage. The MAX531/MAX538/MAX539’s topology makes the output the same polarity as the reference input. An internal reset circuit forces the DAC register to reset to 000 hex on power-up. Additionally, a clear CLR pin, when held low, sets the DAC register to 000 hex. CLR operates asynchronously and independently from the chip-select (CS) pin. Buffer Amplifier The output buffer is a unity-gain stable, rail-to-rail output, BiCMOS op amp. Input offset voltage and CMRR are trimmed to achieve better than 12-bit performance. Settling time is 25µs to 0.01% of final value. The settling time is considerably longer when the DAC code is initially set to 000 hex, because at this code the op amp is com- pletely debiased. Start from code 001 hex if necessary. The output is short-circuit protected and can drive a 2kΩ load with more than 100pF load capacitance. tCSH0 tCSS tCH tCL tCSH1 tCSW tDS tDH tDO CS SCLK DIN DOUT tCS1 Figure 1. Timing Diagram

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Internal Reference (MAX531 only) The on-chip reference is lesser trimmed to generate 2.048V at REFOUT. The output stage can source and sink current, so REFOUT can settle to the correct voltage quickly in response to code-dependent loading changes. Typically, source current is 5mA and sink current is 100µA. REFOUT connects the internal reference to the R-2R DAC ladder at REFIN. The R-2R ladder draws 50µA maximum load current. If any other connection is made to REFOUT, ensure that the total load current is less than 100µA to avoid gain errors. For applications requiring very low-noise performance, connect a 33µF capacitor from REFOUT to AGND. If noise is not a concern, a lower value capacitor (3.3µF min) may be used. To reduce noise further, insert a buffered RC filter between REFOUT and REFIN (Figure 2). The reference bypass capacitor, CREFOUT, is still required for reference stability. In applications not requiring the reference, con- nect REFOUT to VDD or use the MAX538 or MAX539 (no internal reference). External Reference An external reference in the range (VSS + 2V) to (VDD - 2V) may be used with the MAX531 in dual-supply operation. With the MAX538/MAX539 or the MAX531 in single-supply use, the reference must be positive and may not exceed VDD - 2V. The reference voltage determines the DAC’s full- scale output. The DAC input resistance is code dependent and is minimum (40kΩ ) at code 555 hex and virtually infi- nite at code 000 hex. REFIN’s input capacitance is also code dependent and has a 50pF maximum value at sever- al codes. Because of the code-dependent nature of refer- ence input impedances, a high-quality, low-output-imped- ance amplifier (such as the MAX480 low-power, precision op amp) should be used. If an upgrade to the internal reference is required, the 2.5V MAX873A is suitable: ±15mV initial accuracy, TCVOUT = 7ppm/°C (max). Logic Interface The MAX531/MAX538/MAX539 logic inputs are designed to be compatible with TTL or CMOS logic levels. However, to achieve the lowest power dissipation, drive the digital inputs with rail-to-rail CMOS logic. With TTL logic levels, the power requirement increases by a factor of approximately 2. Serial Clock and Update Rate Figure 1 shows the MAX531/MAX538/MAX539 timing. The maximum serial clock rate is given by 1 / (tCH + tCL), approximately 14MHz. The digital update rate is limited by the chip-select period, which is 16 x (tCH + tCL) + tCSW. This equals a 1.14µs, or 877kHz, update rate. However, the DAC settling time to 12 bits is 25µs, which may limit the update rate to 40kHz for full-scale step transitions. ____________Applications Information Refer to Figures 3a and 3b for typical operating connec- tions. Serial Interface The MAX531/MAX538/MAX539 use a three-wire serial interface that is compatible with SPI™, QSPI™ (CPOL = CPHA = 0), and Microwire™ standards as shown in Figures 4 and 5. The DAC is programmed by writing two 8-bit words (see Figure 1 and the Functional Diagram). Sixteen bits of serial data are clocked into the DAC MSB first with the MSB preceded by four fill (dummy) bits. The four dummy bits are not normally needed. They are required only when DACs are daisy-chained. Data is clocked in on SCLK’s rising edge while CS is low. The seri- al input data is held in a 16-bit serial shift register. On CS’s rising edge, the 12 least significant bits are transferred to the DAC register and update the DAC. With CS high, data cannot be clocked into the MAX531/MAX538/MAX539. The MAX531/MAX538/MAX539 input data in 16-bit blocks. The SPI and Microwire interfaces output data in 8-bit blocks, thereby requiring two write cycles to input data to the DAC. The QSPI interface allows variable data input from eight to 16 bits, and can be loaded into the DAC in one write cycle. M A X 5 3 1 /M A X 5 3 8 /M A X 5 3 9 +5V, Low-Power, Voltage-Output, Serial 12-Bit DACs _______________________________________________________________________________________ 9 300 50 1 10 100 100 M A X 5 3 1 -F IG 0 2 FREQUENCY (kHz) R E FE R E N C E N O IS E ( µV R M S ) 150 200 250 0 0.1 1000 TOTAL REFERENCE NOISE RSREFOUT CREFOUT CS TEK 7A22 CREFOUT = 3.3µF CREFOUT = 47µF SINGLE-POLE ROLLOFF 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 R E FE R E N C E N O IS E ( m V p -p ) Figure 2. Reference Noise vs. Frequency SPI and QSPI are trademarks of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.

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Jul*****a Tak

January 8, 2020

Very professional sellers, they have adopted MSL packaging for different parts.

Cair*****rrillo

January 5, 2020

I've never had a problem with Heisener. Packages arrive on time and in great condition.

Oma*****Gray

September 19, 2019

I can get a patience and respect for each order. Thank you!

Mark*****nton

August 4, 2019

The products are good, the amount is correct. The values are correct.

Ryl***** Hora

July 23, 2019

Great website. Well organized and easy to search products.

Cod*****ennis

July 16, 2019

Item works as described, fast delivery, nice contact!

Kevin*****gopalan

July 1, 2019

I was able to make my list of needed parts and use suggested relative selection. The five stars represent the fact they show inventory quantity. So far i'm happy.

Dela*****Nori

February 21, 2019

Competitive prices, fast/cheap shipping, easy find my desired items, powerful online business what I need to do are a few clicks!

Zoe*****ckson

February 18, 2019

The order process is easy and user friendly, very helpful customer service, always fast shipping.

Cami*****chultz

February 18, 2019

Fantastic quality products with fair and prompt shipping. Would save much time crossing all the features. Thank you for all your effort.

MAX538BEPA Guarantees

Service Guarantee

Service Guarantees

We guarantee 100% customer satisfaction.

Our experienced sales team and tech support team back our services to satisfy all our customers.

Quality Guarantee

Quality Guarantees

We provide 90 days warranty.

If the items you received were not in perfect quality, we would be responsible for your refund or replacement, but the items must be returned in their original condition.

MAX538BEPA Packaging

Verify Products
Customized Labels
Professional Packaging
Sealing
Packing
Insepction

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