Datasheet

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

General Description

The MAX5742 quad, 12-bit, low-power, buffered volt-

age-output, digital-to-analog converter (DAC) is pack-

aged in a space-saving 10-pin µMAX package (5mm

3mm). The wide supply voltage range of +2.7V to

+5.5V and 229µA supply current accommodates low-

power and low-voltage applications. DAC outputs

employ on-chip precision output amplifiers that swing

Rail-to-Rail

. The MAX5742’s reference input accepts a

voltage range from 0 to V

. In power-down the refer-

ence input is high impedance, further reducing the sys-

tem’s total power consumption.

The 20MHz, 3-wire SPI™, QSPI™, MICROWIRE™ and

DSP-compatible serial interface saves board space

and reduces the complexity of opto- and transformer-

isolated applications. The MAX5742 on-chip power-on

reset (POR) circuit resets the DAC outputs to zero and

loads the output with a 100kΩ resistor to ground. This

provides additional safety for applications that drive

valves or other transducers that need to be off on

power-up. The MAX5742’s software-controlled power-

down reduces supply current to less than 0.3µA and

provides software-selectable output loads (1kΩ, 100kΩ,

or high impedance) while in power-down. The MAX5742

is specified over the -40°C to +125°C automotive tem-

perature range.

Applications

Automatic Tuning

Gain and Offset Adjustment

Power Amplifier Control

Process Control I/O Boards

Battery-Powered Instruments

VCO Control

Features

♦ Ultra-Low Power Consumption

229µA at V

= +3.6V

271µA at V

= +5.5V

♦ Wide +2.7V to +5.5V Single-Supply Range

♦ 10-Pin µMAX Package

♦ 0.3µA Power-Down Current

♦ Guaranteed 12-Bit Monotonicity (±1LSB DNL)

♦ Safe Power-Up Reset to Zero Volts at DAC Output

♦ Three Software-Selectable Power-Down

Impedances (100kΩ, 1kΩ, Hi-Z)

♦ Fast 20MHz 3-Wire SPI, QSPI, and MICROWIRE-

Compatible Serial Interface

♦ Rail-to-Rail Output Buffer Amplifiers

♦ Schmitt-Triggered Logic Inputs for Direct

Interfacing to Optocouplers

♦ Wide -40°C to +125°C Operating Temperature

Range

MAX5742

12-Bit, Low-Power, Quad, Voltage-Output

DAC with Serial Interface

________________________________________________________________ Maxim Integrated Products 1

OUTD

OUTC

OUTB

OUTAGND

SCLK

MAX5742

µMAX

TOP VIEW

REFDIN

Pin Configuration

19-2122; Rev 2; 7/03

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.

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

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor, Corp.

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX5742EUB -40°C to +85°C 10 µMAX

MAX5742AUB -40°C to +125°C 10 µMAX

Functional Diagram appears at end of data sheet.

Summary of content (15 pages)

PAGE 1
9-2122; Rev 2; 7/03 12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface Features ♦ Ultra-Low Power Consumption 229µA at VDD = +3.6V 271µA at VDD = +5.5V The 20MHz, 3-wire SPI™, QSPI™, MICROWIRE™ and DSP-compatible serial interface saves board space and reduces the complexity of opto- and transformerisolated applications. The MAX5742 on-chip power-on reset (POR) circuit resets the DAC outputs to zero and loads the output with a 100kΩ resistor to ground.
PAGE 2
MAX5742 12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +6V OUT_, SCLK, DIN, CS, REF to GND...............-0.3 to (VDD+0.3V) Maximum Continuous Current Into Any Pin......................±50mA Continuous Power Dissipation (TA = +70°C) 10-Pin µMAX (derate 6.9 mW/°C above +70°C) ..........555mW Operating Temperature Range .........................-40°C to +125°C Junction Temperature...
PAGE 3
12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface (VDD = +2.7V to +5.5V, GND = 0, VREF = VDD, RL = 5kΩ, CL = 200pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are VDD = +5V, TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL INPUTS (SCLK, DIN, CS) Input High Voltage VIH VDD = +3V, +5V Input Low Voltage VIL VDD = +3V, +5V Input Leakage Current IIN Digital inputs = 0 or VDD Input Capacitance CIN 0.7 x VDD V 0.3 x VDD ±0.
PAGE 4
__________________________________________Typical Operating Characteristics (VREF = VDD, TA = +25°C, unless otherwise noted.) DIFFERENTIAL NONLINEARITY vs. CODE, TA = +25°C 0.6 0.4 VDD = +5V 0 -4 0.2 0 -0.2 -0.4 -8 -0.6 VDD = +3V -12 -1.0 INTEGRAL NONLINEARITY vs. CODE, TA = -40°C 0.8 0.6 LSB INL (LSB) 0.2 0 0 -0.2 -4 -0.4 VDD = +3V -0.6 -12 -16 0 512 1024 1536 2048 2560 3072 3584 4096 CODE -4 VDD = +3V -12 -0.
PAGE 5
12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface SOURCE-AND-SINK CURRENT CAPABILITY (VDD = +3V) 2.5 MAXIMUM INL 2.0 0 -4 CODE = C00 HEX, SOURCING CURRENT FROM OUT_ 1.5 MINIMUM INL 1.5 0 20 40 60 80 TEMPERATURE (°C) 0 100 120 2 4 6 8 10 12 14 0 16 0 CODE = 0 x 000 240 160 80 0 250 200 150 100 4.2 4.7 5.2 8 10 12 14 16 800 700 600 VDD = +5V 500 400 300 VDD = +3V 200 50 100 0 3.7 6 900 SUPPLY CURRENT (µA) 320 4 SUPPLY CURRENT vs.
PAGE 6
MAX5742 12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface Typical Operating Characteristics (continued) (VREF = VDD, TA = +25°C, unless otherwise noted.
PAGE 7
12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD = +5V) DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD = +3V) MAX5742 toc24 MAX5742 toc23 CODE 7FF HEX to 800 HEX SCLK, fSCLK = 500kHz, 2V/div SCLK, fSCLK = 500kHz 2V/div VOUT_ AC-COUPLED, 20mV/div VOUT_ AC-COUPLED, 20mV/div CODE 800 HEX to 7FF HEX 1µs/div 1µs/div DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD = +3V) POWER-ON RESET, FAST RISE TIME (VDD = +5V) MAX5742 toc26 MAX5742 toc25 SCLK, fSCLK = 500kHz,
PAGE 8
MAX5742 12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface Typical Operating Characteristics (continued) (VREF = VDD, TA = +25°C, unless otherwise noted.
PAGE 9
12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface PIN NAME FUNCTION 1 CS Chip-Select Input 2 SCLK Serial-Clock Input 3 VDD Power-Supply Input 4 GND Ground 5 DIN Serial Data Input 6 REF External Reference Voltage Input 7–10 OUTA –OUTD DAC Voltage Outputs. Power-on reset sets DAC registers to zero, and internally connects OUT to GND with 100kΩ resistor. Detailed Description The MAX5742 contains four 12-bit, voltage-output, lowpower digital-to-analog converters (DACs).
PAGE 10
MAX5742 12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface Table 1.
PAGE 11
12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface C3 D0 (LSB) C2 C1 C0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Figure 1. 16-Bit Input Word tCL SCLK X 1 2 tOS DIN X C3 tCSPWH tCH 3 4 5 6 16 X tOH C2 C1 C0 D11 D10 D1 D0 X tCSH tCSS CS Figure 2.
PAGE 12
MAX5742 12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface Table 2.
PAGE 13
12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface Table 4. Bipolar Code Table DAC CONTENTS ANALOG OUTPUT DAC CONTENTS 1111 1111 1111  4095  VREF    4096  1111 1111 1111  2047  + VREF    2048  1000 0000 0001  2049  VREF    4096  1000 0000 0001  1  + VREF    2048  VREF 2 1000 0000 0000  2047  VREF    4096  0111 1111 1111 MAX5742 Table 3.
PAGE 14
12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface MAX5742 Functional Diagram VDD INPUT REGISTER A REF DAC REGISTER A 12-BIT DAC A OUTPUT BUFFER OUTA RESISTOR NETWORK INPUT REGISTER B DAC REGISTER B 12-BIT DAC B OUTPUT BUFFER OUTB RESISTOR NETWORK INPUT REGISTER C DAC REGISTER C 12-BIT DAC C OUTPUT BUFFER OUTC RESISTOR NETWORK INPUT REGISTER D DAC REGISTER D 12-BIT DAC D OUTPUT BUFFER OUTD RESISTOR NETWORK INPUT CONTROL LOGIC AND SHIFT REGISTER POWER-DOWN CONTROL L
PAGE 15
12-Bit, Low-Power, Quad, Voltage-Output DAC with Serial Interface 10LUMAX.EPS e 4X S 10 10 INCHES H ÿ 0.50±0.1 0.6±0.1 1 1 0.6±0.1 BOTTOM VIEW TOP VIEW D2 MILLIMETERS MAX DIM MIN A 0.043 A1 0.002 0.006 A2 0.030 0.037 D1 0.116 0.120 D2 0.114 0.118 E1 0.116 0.120 0.118 E2 0.114 0.199 H 0.187 L 0.0157 0.0275 L1 0.037 REF b 0.007 0.0106 e 0.0197 BSC c 0.0035 0.0078 0.0196 REF S α 0∞ 6∞ MAX MIN 1.10 0.15 0.05 0.75 0.95 3.05 2.95 3.00 2.89 3.05 2.95 2.89 3.00 4.75 5.05 0.40 0.70 0.940 REF 0.177 0.