Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - DA converter (DAC) uMAX 10

General Description

The MAX5236/MAX5237 precision, dual, voltage-out-

put, 10-bit digital-to-analog converters (DACs) con-

sume only 360µA from a single 5V (MAX5237) or 325µA

from a single 3V (MAX5236) supply. These devices fea-

ture output buffers that swing Rail-to-Rail

. The internal

gain amplifiers (1.6384V/V) maximize the dynamic

range of the DAC output.

The MAX5236/MAX5237 feature 13.5MHz a 3-wire seri-

al interface compatible with SPI™/QSPI™/and

MICROWIRE™. Each DAC input is organized as an

input register followed by a DAC register. A 16-bit shift

ters update the DAC registers independently or simulta-

neously. In addition, programmable control bits allow

power-down with 1kΩ or 200kΩ internal loads.

The MAX5236/MAX5237 are fully specified over the

extended industrial temperature range (-40°C to +85°C)

and are available in space-saving 10-pin µMAX packages.

Applications

Industrial Process Controls

Automatic Test Equipment

Digital Offset and Gain Adjustment

Motion Control

µP-Controlled Systems

Features

♦ Guaranteed 1/2LSB INL (max)

♦ Low Supply Current

325µA (Normal Operation)

0.4µA (Full Power-Down Mode)

♦ Single-Supply Operation

3V (MAX5236)

5V (MAX5237)

♦ Space-Saving 10-Pin µMAX Package

♦ Output Buffers Swing Rail-to-Rail

♦ Power-On Reset Clears Registers and DACs

to Zero

♦ Programmable Shutdown Modes with 1kΩ or

200kΩ Internal Loads

♦ Resets to Zero

♦ 13.5MHz SPI/QSPI/MICROWIRE-Compatible,

3-Wire Serial Interface

♦ Buffered Output Drives 5kΩ || 100pF

MAX5236/MAX5237

Single-Supply 3V/5V, Voltage-Output, Dual,

Precision 10-Bit DACs

________________________________________________________________ Maxim Integrated Products 1

OUTB

REFB

DINLDAC

GND

REFA

OUTA

MAX5236

MAX5237

µMAX

TOP VIEW

SCLKCS

Pin Configuration

Ordering Information

19-2329; Rev 0; 1/02

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP

RANGE

PIN-

PACKAGE

INL

(LSB)

MAX5236EUB

-40°C to +85°C 10 µMAX ±0.5

MAX5237EUB

-40°C to +85°C 10 µMAX ±0.5

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

SPI/QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Summary of content (19 pages)

PAGE 1
9-2329; Rev 0; 1/02 Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs The MAX5236/MAX5237 feature 13.5MHz a 3-wire serial interface compatible with SPI™/QSPI™/and MICROWIRE™. Each DAC input is organized as an input register followed by a DAC register. A 16-bit shift register loads data into the input registers. Input registers update the DAC registers independently or simultaneously. In addition, programmable control bits allow power-down with 1kΩ or 200kΩ internal loads.
PAGE 2
MAX5236/MAX5237 Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs ABSOLUTE MAXIMUM RATINGS VDD to GND .............................................................-0.3V to +6V Digital Inputs to GND ..............................................-0.3V to +6V REF_, OUT_ to GND ................................-0.3V to (VDD + 0.3V) Maximum Current into Any Pin............................................50mA Continuous Power Dissipation (TA = +70°C) 10-Pin µMAX (derate 5.60mW/°C above +70°C) .....
PAGE 3
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs (VDD = +4.5V to +5.5V, GND = 0, VREFA = VREFB = +2.5V, RL= 5kΩ, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL INPUT Input High Voltage VIH Input Low Voltage VIL Input Hysteresis 0.7 ✕ VDD 0.3 ✕ VDD VHYS Input Leakage Current V 200 Digital inputs = 0 or VDD mV ±1 Input Capacitance V µA 8 pF 0.
PAGE 4
MAX5236/MAX5237 Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs ELECTRICAL CHARACTERISTICS—MAX5236 (VDD = +2.7V to +3.6V, GND = 0, VREFA = VREFB = +1.25V, RL = 5kΩ, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs (VDD = +2.7V to +3.6V, GND = 0, VREFA = VREFB = +1.25V, RL = 5kΩ, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 6
MAX5236/MAX5237 Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs TIMING CHARACTERISTICS—MAX5236 (FIGURES 1 AND 2) (VDD = +2.7V to +3.6V, GND = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 7
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs INTEGRAL NONLINEARITY vs. DIGITAL INPUT CODE (MAX5236) 0.2 0.10 0.1 0.05 0 -0.1 -0.10 -0.3 -0.15 -0.4 -0.20 -0.5 125 250 375 500 625 750 875 1000 0.1 0 -0.1 -0.2 -0.3 -0.4 0 125 250 375 500 625 750 875 1000 0 125 250 375 500 625 750 875 1000 DIGITAL INPUT CODE DIGITAL INPUT CODE DIGITAL INPUT CODE DIFFERENTIAL NONLINEARITY vs. DIGITAL INPUT CODE (MAX5237) MAX5236 SUPPLY CURRENT vs. TEMPERATURE MAX5237 SUPPLY CURRENT vs.
PAGE 8
Typical Operating Characteristics (continued (VDD = +5V (MAX5237) VDD = +3V (MAX5236), RL = 5kΩ, CL = 100pF, VREF = +1.25V (MAX5236), VREF = +2.5V (MAX5237), CREF = 0.1µF ceramic || 2.2µF electrolytic, both DACs on, VOUT = full scale, TA = +25°C, unless otherwise noted.) MAX5236 ONE DAC SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE 26 25 24 23 0.8 176 175 174 173 0.7 0.6 0.5 0.4 0.3 22 172 0.2 21 171 0.1 NO LOAD NO LOAD 170 20 TEMPERATURE (°C) MAX5237 BOTH DACs SHUTDOWN SUPPLY CURRENT vs.
PAGE 9
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs MAX5236 DYNAMIC RESPONSE RISE TIME MAX5236 DYNAMIC RESPONSE FALL TIME MAX5237 DYNAMIC RESPONSE RISE TIME MAX5236/7 toc19 MAX5236/7 toc21 MAX5236/7 toc20 CS 1V/div CS 1V/div CS 2V/div OUT_ 1V/div OUT_ 1V/div OUT_ 2V/div 2µs/div 2µs/div 4µs/div MAX5236 CROSSTALK MAX5237 DYNAMIC RESPONSE FALL TIME CS 2V/div OUT_ 2V/div MAX5237 CROSSTALK MAX5236/7 toc23 MAX5236/7 toc22 MAX5236/7 toc24 OUTB 2V/div OUTB 5V/div OUTA 1mV/div SHU
PAGE 10
Typical Operating Characteristics (continued) (VDD = +5V (MAX5237) VDD = +3V (MAX5236), RL = 5kΩ, CL = 100pF, VREF = +1.25V (MAX5236), VREF = +2.5V (MAX5237), CREF = 0.1µF ceramic || 2.2µF electrolytic, both DACs on, VOUT = full scale, TA = +25°C, unless otherwise noted.) 4.5 MAX5236/7 toc29 2.25 2.00 1.75 4.0 3.5 3.0 VOUT (V) 1.50 OUT_ 50mV/div AC-COUPLED 1.25 1.00 2.5 2.0 0.75 1.5 0.50 1.0 0.25 0.
PAGE 11
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs MAX5236/MAX5237 COMMAND EXECUTED CS SCLK 1 DIN C2 8 C1 C0 D9 D8 D7 D6 D5 9 D4 16 D3 D2 D1 D0 S2 S1 (1) S0 Figure 1. Serial Interface Timing tLDL tCSLD LDAC tCSW CS tCSO tCSS tCSH tCS1 SCLK tCH tCL tCP DIN tDS tDH Figure 2.
PAGE 12
MAX5236/MAX5237 Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs Table 1. Serial Data Format MSB <----------- 16 bits of serial data -----------> LSB 3 Control Bits MSB......10 Data Bits.....LSB Sub-Bits C2...C0 D9................................D0 S2……..S0 The general timing diagram of Figure 1 illustrates data acquisition. Driving CS low enables the device to receive data. Otherwise the interface control circuitry is disabled.
PAGE 13
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs 16-BIT SERIAL WORD FUNCTION C2 C1 C0 D9..............D0 S2, S1, S0* 0 0 1 10-bit DAC data 000 0 1 0 10-bit DAC data 000 Load input register A; all DAC registers are updated. Load input register A; DAC registers are unchanged. 0 1 1 10-bit DAC data 000 Load all DAC registers from the shift register (start up both DACs with new data, and load the input registers).
PAGE 14
MAX5236/MAX5237 Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs Table 4. Unipolar Code Table (Gain = 1.6384) DAC CONTENTS MSB LSB 121kΩ ANALOG OUTPUT 77.25kΩ 1111 1111 1 1 (000)  1023  + VREF   × 1.6384  1024  1000 0000 0 1 (000)  513  + VREF   × 1.6384  1024  1000 0000 0 0 (000)  512  + VREF   × 1.6384 = VREF  1024  R 2R R OUT_ R 2R 2R 2R 2R D0 D7 D8 D9 1kΩ REF_ GND SHOWN FOR ALL ONES ON DAC 0111 1111 1 1 (000)  511  + VREF   × 1.
PAGE 15
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs ANALOG OUTPUT VALUE (LSB) ANALOG OUTPUT VALUE (LSB) 6 6 5 4 AT STEP 011 (1/2LSB ) 3 2 AT STEP 001 (1/4LSB ) 1 1LSB 5 DIFFERENTIAL LINEARITY ERROR (-1/4LSB) 4 3 1LSB 2 DIFFERENTIAL LINEARITY ERROR (+1/4LSB) 1 0 0 000 001 010 011 100 101 110 000 111 001 Figure 6a.
PAGE 16
MAX5236/MAX5237 Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs 5V/3V REF_ 5V/3V REF_ 10kΩ 10kΩ VDD VDD MAX5236 MAX5237 121kΩ MAX5236 MAX5237 121kΩ V+ 77.25kΩ 77.25kΩ VOUT 0.06384R OUT_ DAC_ DAC_ OUT_ R 1kΩ V- 1kΩ GND GND GAIN = 1.6384V/V Figure 7. Unipolar Output Circuit (Rail-to-Rail) Figure 8. Bipolar Output Circuit 5V/3V V+ 5V/3V 26kΩ AC REFERENCE INPUT REF_ PHOTODIODE VDD MAX495 500mVP-P 5V/3V 10kΩ REF_ VDD MAX5236 MAX5237 121kΩ 121kΩ V+ 77.
PAGE 17
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs MAX5236/MAX5237 VDD 121kΩ VIN MAX5236 MAX5237 REFA 77.25kΩ OUTA R1 CS SHIFT REGISTER SCLK DIN VREF INPUT REG A DAC REG A DAC A INPUT REG B DAC REG B DAC B R2 OUTB VOUT R3 REFB R4 77.25kΩ 121kΩ VOUT = (GAIN) (OFFSET) R2 = VIN 2NA 1 + R4 – VREF 2NB R4 1024 R1 + R2 R3 1024 R3 NA IS THE NUMERIC VALUE OF THE INPUT CODE FOR DAC A. NB IS THE NUMERIC VALUE OF THE INPUT CODE FOR DAC B. GND Figure 11.
PAGE 18
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs MAX5236/MAX5237 Functional Diagram GND VDD REFA 121kΩ DECODE CONTROL LDAC 77.25kΩ OUTA INPUT REG A 16-BIT SHIFT REGISTER DAC REG A DAC A 1kΩ SR CONTROL MAX5236 MAX5237 121kΩ 77.
PAGE 19
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 10-Bit DACs 10LUMAX.EPS 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.