Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - DA converter (DAC) SOIC 16 W

_______________General Description

The MAX532 is a complete, dual, serial-input, 12-bit

multiplying digital-to-analog converter (MDAC) with out-

put amplifiers. No external user trims are required to

achieve full specified performance. The MAX532’s 3-

wire serial interface minimizes the number of package

pins, so it uses less board space than parallel-interface

parts. The interface is SPI™, QSPI™ and Microwire™

compatible. A serial output, DOUT, allows cascading

of two or more MAX532s and read-back of the data

written to the device.

The device’s serial interface minimizes digital-noise

feedthrough from its logic pins to its analog outputs.

Serial interfacing also simplifies opto-coupler-isolated

or transformer-isolated applications.

The MAX532 is specified with ±12V to ±15V power sup-

plies. All logic inputs are TTL and CMOS compatible. It

comes in space-saving 16-pin DIP and wide SO packages.

________________________Applications

Automatic Test Equipment

Arbitrary Waveform Generators

Programmable-Gain Amplifiers

Motion Control Systems

Servo Controls

____________________________Features

♦ Two 12-Bit MDACs with Output Amplifiers

♦ Fast, 6MHz 3-Wire Interface

♦ SPI, QSPI, and Microwire Compatible

♦ ±12V Output Swing

♦ ±10mA Output Current

♦ 2.5µs Settling Time to ±1/2LSB

♦ Guaranteed Monotonic Over Temperature

♦ Low Integral Nonlinearity: ±1/2LSB Max

♦ Low Gain Tempco: 2ppm/°C

♦ Operates from ±12V to ±15V Supplies

♦ Power-On Reset

♦ Available in 16-Pin DIP and Wide SO Packages

______________Ordering Information

MAX532

Dual, Serial-Input,

Voltage-Output, 12-Bit MDAC

________________________________________________________________

Maxim Integrated Products

LDAC

DIN

AGNDA

VOUTA

VREFA

RFBA

TOP VIEW

DOUT

SCLK

DGND

RFBB

VREFB

VOUTB

AGNDB

DIP/Wide SO

MAX532

__________________Pin Configuration

DACA

LATCH

24-BIT SHIFT

DACB

LATCH

DACA

RFBA

VOUTA

DOUT

RFBB

VOUTB

AGNDB

AGNDA

VREFA

DIN

SCLK

LDAC

VREFB

DACB

DGND

MAX532

________________Functional Diagram

Call toll free 1-800-998-8800 for free samples or literature.

19-0046; Rev. 1; 3/94

PART TEMP. RANGE PIN-PACKAGE

MAX532ACPE 0°C to +70°C 16 Plastic DIP

MAX532BCPE 0°C to +70°C 16 Plastic DIP

MAX532ACWE 0°C to +70°C 16 Wide SO

MAX532BCWE 0°C to +70°C 16 Wide SO

MAX532BC/D 0°C to +70°C Dice*

™Microwire is a trademark of National Semiconductor Corp. SPI and QSPI are trademarks of Motorola, Inc.

±1/2

±1

±1/2

±1

ERROR

(LSBs)

Ordering Information continued on last page.

* Contact factory for dice specifications.

Summary of content (16 pages)

PAGE 1
9-0046; Rev. 1; 3/94 Dual, Serial-Input, Voltage-Output, 12-Bit MDAC ________________________Applications Automatic Test Equipment Arbitrary Waveform Generators ____________________________Features ♦ Two 12-Bit MDACs with Output Amplifiers ♦ Fast, 6MHz 3-Wire Interface ♦ SPI, QSPI, and Microwire Compatible ♦ ±12V Output Swing ♦ ±10mA Output Current ♦ 2.
PAGE 2
MAX532 Dual, Serial-Input, Voltage-Output, 12-Bit MDAC ABSOLUTE MAXIMUM RATINGS Pin Voltages VDD to DGND, AGNDA, AGNDB........................-0.3V to +17V VSS to DGND, AGNDA, AGNDB (Note 1) ..........+0.3V to -17V VREFA, VREFB.............................(VSS - 0.3V) to (VDD + 0.3V) AGNDA, AGNDB .....................(DGND - 0.3V) to (VDD + 0.3V) VOUTA, VOUTB ...........................(VSS - 0.3V) to (VDD + 0.3V) RFBA, RFBB.................................(VSS - 0.3V) to (VDD + 0.
PAGE 3
Dual, Serial-Input, Voltage-Output, 12-Bit MDAC (VDD = 11.4V to 16.5V, VSS = -11.4V to -16.5V, AGNDA = AGNDB = DGND = 0V, VREFA and VREFB = +10V, RL = 2kΩ, CL = 100pF, VOUT_ connected to RFB_, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS DIGITAL INPUTS (SCLK, DIN, LDAC, CS) VINH Input High Voltage MIN TYP 2.
PAGE 4
MAX532 Dual, Serial-Input, Voltage-Output, 12-Bit MDAC ELECTRICAL CHARACTERISTICS (continued) (VDD = 11.4V to 16.5V, VSS = -11.4V to -16.5V, AGNDA = AGNDB = DGND = 0V, VREFA and VREFB = +10V, RL = 2kΩ, CL = 100pF, VOUT_ connected to RFB_, TA = TMIN to TMAX, unless otherwise noted.
PAGE 5
Dual, Serial-Input, Voltage-Output, 12-Bit MDAC OUTPUT VOLTAGE SWING vs. RESISTIVE LOAD NOISE SPECTRAL DENSITY LARGE-SIGNAL FREQUENCY RESPONSE 25 5 VOUT (Vp-p) 15 10 5 VREF = 0V DAC CODE = 11...111 GAIN = -1 300 -10 200 10 1k 100 VREF = 20Vp-p DAC CODE = 11...
PAGE 6
MAX532 Dual, Serial-Input, Voltage-Output, 12-Bit MDAC ____________________________Typical Operating Characteristics (continued) (VDD = 15V, VSS = -15V, RL = 2kΩ, CL = 100pF, unless otherwise noted.
PAGE 7
Dual, Serial-Input, Voltage-Output, 12-Bit MDAC tCSW tCSH1 tLDACS CS tCSHO tCSSO tCH tCSS1 tCL SCLK tDS tDH D0 DIN tDV D1 D23 tD0 Q0 DOUT tTR Q1 Q23 D0 LDAC tLDAC DACS UPDATED Figure 1.
PAGE 8
MAX532 Dual, Serial-Input, Voltage-Output, 12-Bit MDAC _______________________________________________Timing Diagrams (continued) CS DACS UPDATED SCLK DIN D23............................................D16 MSB DACB D15 D14 D13 D12 D11.......... LSB DACB D1 D0 MSB DACA LSB DACA DOUT Q23 Q22..................................... Q16 MSB DACB FROM PREVIOUS WRITE Q15 Q14 Q13 Q12 Q11.......... MSB DACA FROM PREVIOUS WRITE Q1 Q0 D23 D23 Figure 2.
PAGE 9
Dual, Serial-Input, Voltage-Output, 12-Bit MDAC 1k MAX532 MAX532 5V 5V 1k SCLK SK DOUT MISO DIN SO DIN MOSI DOUT SI MICROWIRE PORT MAX532 SCLK CS I/O CS LDAC I/O LDAC THE DOUT-SI CONNECTION IS NOT REQUIRED FOR WRITING TO THE MAX532, BUT MAY BE USED FOR READ-BACK PURPOSES. SCK SS SPI PORT I/O I/O CPOL = 0, CPHA = 0 THE DOUT-MISO CONNECTION IS NOT REQUIRED FOR WRITING TO THE MAX532, BUT MAY BE USED FOR READ-BACK PURPOSES. Figure 4. Connections for Microwire Figure 5.
PAGE 10
MAX532 Dual, Serial-Input, Voltage-Output, 12-Bit MDAC +5V +5V RP 1k RP 1k MAX532 SCLK SCLK DIN DIN CS CS RP 1k MAX532 SCLK DOUT +5V MAX532 SCLK DOUT DIN CS DOUT DIN CS LDAC LDAC LDAC TO OTHER SERIAL DEVICES MAX532 SCLK SCLK DIN DIN CS CS LDAC Figure 6. Daisy-chained or individual MAX532s are simultaneously updated by bringing CS high when using the 3-wire interface (LDAC = DGND).
PAGE 11
Dual, Serial-Input, Voltage-Output, 12-Bit MDAC VPULL-UP (V) C (pF) RP (kΩ) tRC (ns) 4.5 20 1 15 4.5 35 1 27 4.5 50 1 38 4.5 100 1 76 4.5 150 1 114 11.4 20 3 14 11.4 35 3 25 11.4 50 3 35 11.4 100 3 71 11.4 150 3 106 13.5 20 3 12 13.5 35 3 21 13.5 50 3 29 13.5 100 3 59 13.5 150 3 88 Figure 8 shows a simplified circuit diagram for one of the DACs and the output amplifier.
PAGE 12
MAX532 Dual, Serial-Input, Voltage-Output, 12-Bit MDAC Output Amplifiers The output amplifiers are stable with any combination of resistive loads ≥ 2kΩ and capacitive loads ≤ 100pF. They are internally compensated, and settle to ±0.01% FSR (1/2LSB) in 2.5µs. Unipolar Configuration Figure 9 shows DACA connected for unipolar binary operation. Similar connections apply for DACB. When VIN is an AC signal, the circuit performs two-quadrant multiplication. Table 2 shows the codes for this circuit.
PAGE 13
Dual, Serial-Input, Voltage-Output, 12-Bit MDAC MAX532 DACA R 2 VIN 1 RFBA VREFA 2 4096 CODE R/2 VOUTA 3 VOUT AGNDA 4 VOUT VIN = -4096 CODE R 4096 REQA = —— (————) , 2 CODE Figure 12. Programmable-Gain Amplifer where CODE is the DAC code in decimal. The transfer function is thus: VOUT ——— = VIN -4096 ——— CODE The code may be programmed between 1 and (212 -1). The zero code is not allowed, as it results in an openloop amplifier response.
PAGE 14
MAX532 Dual, Serial-Input, Voltage-Output, 12-Bit MDAC __Ordering Information (continued) PART TEMP. RANGE PIN-PACKAGE ERROR (LSBs) MAX532AEPE -40°C to +85°C 16 Plastic DIP ±1/2 MAX532BEPE MAX532AEWE MAX532BEWE -40°C to +85°C -40°C to +85°C -40°C to +85°C 16 Plastic DIP 16 Wide SO 16 Wide SO ±1 ±1/2 ±1 MAX532AMJE MAX532BMJE -55°C to +125°C -55°C to +125°C 16 CERDIP** 16 CERDIP** ±1/2 ±1 **Contact factory for availability and processing to MIL-STD-883B.
PAGE 15
Dual, Serial-Input, Voltage-Output, 12-Bit MDAC DIM D1 A A1 A2 A3 B B1 C D D1 E E1 e eA eB L α E E1 D A3 A A2 L A1 INCHES MAX MIN 0.200 – – 0.015 0.150 0.125 0.080 0.055 0.022 0.016 0.065 0.050 0.012 0.008 0.765 0.745 0.030 0.005 0.325 0.300 0.280 0.240 0.100 BSC 0.300 BSC 0.400 – 0.150 0.115 15˚ 0˚ MILLIMETERS MIN MAX – 5.08 0.38 – 3.18 3.81 1.40 2.03 0.41 0.56 1.27 1.65 0.20 0.30 18.92 19.43 0.13 0.76 7.62 8.26 6.10 7.11 2.54 BSC 7.62 BSC – 10.16 2.92 3.
PAGE 16
MAX532 Dual, Serial-Input, Voltage-Output, 12-Bit MDAC Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.