Datasheet

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

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General Description

The MAX5234/MAX5235 precision, dual-output, 12-bit

digital-to-analog converters (DACs) consume only 360µA

from a single 5V (MAX5235) or 325µA from a single 3V

(MAX5234) supply. These devices feature output buffers

that swing Rail-to-Rail

. The internal gain amplifiers maxi-

mize the dynamic range of the DAC output.

The MAX5234/MAX5235 feature a 13.5MHz 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 MAX5234/MAX5235 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 (MAX5234)

5V (MAX5235)

♦ 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

19-2330; Rev 0; 1/02

MAX5234/MAX5235

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

Precision 12-Bit DACs

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

OUTB

REFB

DINLDAC

GND

REFA

OUTA

MAX5234

MAX5235

µMAX

TOP VIEW

SCLKCS

Ordering Information

PART

TEMP

RANGE

PIN-

PACKAGE

INL

(LSB)

MAX5234AEUB

-40°C to +85°C 10 µMAX ±0.5

MAX5234BEUB -40°C to +85°C 10 µMAX ±1

MAX5235AEUB

-40°C to +85°C 10 µMAX ±0.5

MAX5235BEUB -40°C to +85°C 10 µMAX ±1

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
9-2330; Rev 0; 1/02 Single-Supply 3V/5V, Voltage-Output, Dual, Precision 12-Bit DACs Features ♦ Guaranteed 1/2LSB INL (max) The MAX5234/MAX5235 are fully specified over the extended industrial temperature range (-40°C to +85°C) and are available in space-saving 10-pin µMAX packages. ♦ Programmable Shutdown Modes with 1kΩ or 200kΩ Internal Loads Applications Industrial Process Controls ♦ Low Supply Current 325µA (Normal Operation) 0.
PAGE 2
MAX5234/MAX5235 Single-Supply 3V/5V, Voltage-Output, Dual, Precision 12-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 12-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 x VDD 0.3 x VDD VHYS Input Leakage Current V 200 mV ±1 Digital inputs = 0 or VDD Input Capacitance V µA 8 pF 0.
PAGE 4
MAX5234/MAX5235 Single-Supply 3V/5V, Voltage-Output, Dual, Precision 12-Bit DACs ELECTRICAL CHARACTERISTICS—MAX5234 (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 12-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
MAX5234/MAX5235 Single-Supply 3V/5V, Voltage-Output, Dual, Precision 12-Bit DACs TIMING CHARACTERISTICS—MAX5234 (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 12-Bit DACs INTEGRAL NONLINEARITY vs. DIGITAL CODE (MAX5235) 0.20 0.15 0.10 0.1 0.05 0 -0.1 -0.3 -0.15 -0.4 -0.20 -0.5 -0.25 0.1 0 -0.1 -0.2 -0.3 -0.4 0 500 1000 1500 2000 2500 3000 3500 4000 500 1000 1500 2000 2500 3000 3500 4000 0 500 1000 1500 2000 2500 3000 3500 4000 DIGITAL INPUT CODE DIGITAL INPUT CODE DIGITAL INPUT CODE DIFFERENTIAL NONLINEARITY vs. DIGITAL INPUT CODE (MAX5235) MAX5234 SUPPLY CURRENT vs.
PAGE 8
Typical Operating Characteristics (continued) (VDD = +5V (MAX5235) VDD = +3V (MAX5234), RL = 5kΩ, CL = 100pF, VREF = +1.25V (MAX5234), VREF = +2.5V (MAX5235), CREF = 0.1µF ceramic || 2.2µF electrolytic, both DACs on, VOUT = full scale, TA = +25°C, unless otherwise noted.) 178 25 24 23 177 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 60 85 -40 TEMPERATURE (°C) MAX5235 BOTH DACs SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE MAX5235 ONE DAC SHUTDOWN SUPPLY CURRENT vs.
PAGE 9
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 12-Bit DACs MAX5234 DYNAMIC RESPONSE RISE TIME MAX5235 DYNAMIC RESPONSE RISE TIME MAX5234 toc19 MAX5234 DYNAMIC RESPONSE FALL TIME MAX5234 toc20 MAX5234 toc21 CS 1V/div CS 1V/div CS 2V/div OUT_ 1V/div OUT_ 2V/div OUT_ 1V/div 2µs/div 4µs/div MAX5235 DYNAMIC RESPONSE FALL TIME MAX5234 CROSSTALK MAX5235 CROSSTALK MAX5234 toc23 MAX5234 toc22 CS 2V/div 2µs/div MAX5234 toc24 OUTB 2V/div OUTB 5V/div OUTA 1mV/div SHUTDOWN OUTA 1mV/div SHU
PAGE 10
Typical Operating Characteristics (continued) (VDD = +5V (MAX5235) VDD = +3V (MAX5234), RL = 5kΩ, CL = 100pF, VREF = +1.25V (MAX5234), VREF = +2.5V (MAX5235), CREF = 0.1µF ceramic || 2.2µF electrolytic, both DACs on, VOUT = full scale, TA = +25°C, unless otherwise noted.) 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 0.5 0 0 2µs/div 0 0.25 0.50 0.
PAGE 11
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 12-Bit DACs MAX5234/MAX5235 COMMAND EXECUTED CS SCLK 1 DIN C2 8 C1 C0 D11 D10 D9 D8 9 D7 D6 16 D5 D4 D3 D2 D1 D0 (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
MAX5234/MAX5235 Single-Supply 3V/5V, Voltage-Output, Dual, Precision 12-Bit DACs Table 1. Serial Data Format MSB <----------- 16 bits of serial data -----------> LSB 3 Control Bits MSB......12 Data Bits.....LSB Sub Bit C2...C0 D11................................D0 S0 register on the rising edge of SCLK. As CS goes high, data is latched into the input and/or DAC registers, depending on the control bits and D11–D8. The maximum clock frequency guaranteed for proper operation is 13.5MHz.
PAGE 13
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 12-Bit DACs 16-BIT SERIAL WORD FUNCTION C2 C1 C0 D11..............D0 S0* 0 0 1 12-bit DAC data 0 0 1 0 12-bit DAC data 0 Load input register A; all DAC registers are updated. Load input register A; DAC registers are unchanged. 0 1 1 12-bit DAC data 0 Load all DAC registers from the shift register (start up both DACs with new data, and load the input registers).
PAGE 14
MAX5234/MAX5235 Single-Supply 3V/5V, Voltage-Output, Dual, Precision 12-Bit DACs Table 4. Unipolar Code Table (Gain = 1.6384) DAC CONTENTS MSB LSB 121kΩ ANALOG OUTPUT 77.25kΩ 1111 1111 1 111 (0)  4095  + VREF   × 1.6384  4096  1000 0000 0 001 (0)  2049  + VREF   × 1.6384  4096  1000 0000 0 000 (0)  2048  + VREF   × 1.6384 = VREF  4096  R 2R R OUT_ R 2R 2R 2R 2R D0 D9 D10 D11 1kΩ REF_ GND SHOWN FOR ALL ONES ON DAC 0111 1111 1 111 (0)  2047  + VREF   × 1.
PAGE 15
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 12-Bit DACs MAX5234/MAX5235 7 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 0 000 001 010 011 100 101 110 111 000 001 DIGITAL INPUT CODE Figure 6a.
PAGE 16
MAX5234/MAX5235 Single-Supply 3V/5V, Voltage-Output, Dual, Precision 12-Bit DACs 5V/3V REF_ 5V/3V REF_ VDD MAX5234 MAX5235 10kΩ 10kΩ VDD MAX5234 MAX5235 121kΩ 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 PHOTODIODE VDD MAX5234 MAX5235 MAX495 500mVP-P 5V/3V REF_ 10kΩ REF_ VDD 121kΩ V+ 121kΩ 77.
PAGE 17
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 12-Bit DACs MAX5234/MAX5235 VDD 121kΩ VIN REFA MAX5234 MAX5235 77.25kΩ OUTA R1 CS SCLK DIN VREF SHIFT REGISTER 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 4096 R1 + R2 R3 4096 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 12-Bit DACs MAX5234/MAX5235 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 MAX5234 MAX5235 121kΩ 77.
PAGE 19
Single-Supply 3V/5V, Voltage-Output, Dual, Precision 12-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.