Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsData collecting ICsData acquisition IC - DA converter (DAC) uMAX 8

General Description

The MAX5722 dual,12-bit, low-power, buffered voltage-

output, digital-to-analog converter (DAC) is packaged

in a space-saving 8-pin µMAX package (5mm

3mm).

The wide supply voltage range of +2.7V to +5.5V and

112µA supply current accommodates low-power and

low-voltage applications. DAC outputs employ on-chip

precision output amplifiers that swing Rail-to-Rail

. The

MAX5722’s reference input accepts a voltage range

from 0 to V

. In power-down, the reference input is

high impedance, further reducing the system’s total

power consumption.

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

DSP-compatible serial interface save board space and

reduce the complexity of opto- and transformer-isolated

applications. The MAX5722 on-chip power-on reset

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

the output with a 100kΩ resistor to ground. This pro-

vides additional safety for applications that drive valves

or other transducers that need to be off on power-up.

The MAX5722’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 MAX5722 is

specified over the -40°C to +125°C automotive temper-

ature 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

112µA at V

= +3.6V

135µA at V

= +5.5V

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

♦ 8-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

MAX5722

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

DAC with Serial Interface

________________________________________________________________ Maxim Integrated Products 1

REF

DINSCLK

OUTB

OUTAGND

µMAX

TOP VIEW

MAX5722

Pin Configuration

19-2124; 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

MAX5722EUA -40°C to +85°C 8 µMAX

MAX5722AUA -40°C to +125°C 8 µMAX

Functional Diagram appears at end of data sheet.

Summary of content (14 pages)

PAGE 1
9-2124; Rev 2; 7/03 12-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface Features ♦ Ultra-Low Power Consumption 112µA at VDD = +3.6V 135µA at VDD = +5.5V The 20MHz, 3-wire SPI™, QSPI™, MICROWIRE™, and DSP-compatible serial interface save board space and reduce the complexity of opto- and transformer-isolated applications. The MAX5722 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
MAX5722 12-Bit, Low-Power, Dual, 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) 8-Pin µMAX (derate 4.6 mW/°C above +70°C) ............362mW Operating Temperature Range .........................
PAGE 3
12-Bit, Low-Power, Dual, 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) 0.7 x VDD Input High Voltage VIH VDD = +3V, +5V V Input Low Voltage VIL VDD = +3V, +5V Input Leakage Current IIN Digital inputs = 0 or VDD Input Capacitance CIN 5 pF SR 0.5 V/µs ±0.1 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 DNL (LSB) INL (LSB) 0 -4 0.2 0 -0.2 -0.4 VDD = +3V -0.6 -12 -16 0 512 1024 1536 2048 2560 3072 3584 4096 CODE 0 -4 VDD = +3V -12 -0.2 VDD = +5V 0 MAX5722 toc08 0.6 0.4 0.2 0 -0.2 -0.6 1.0 0.8 0.6 0.4 VDD = +3V 0.2 0 -0.2 VDD = +5V -0.
PAGE 5
12-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface SOURCE-AND-SINK CURRENT CAPABILITY (VDD = +3V) 12 CODE = FFF HEX, SOURCING CURRENT FROM OUT_ 2.5 0 MINIMUM DNL -8 MINIMUM INL -16 CODE = 000 HEX, SINKING CURRENT INTO OUT_ -20 0 20 40 60 80 TEMPERATURE (°C) 100 120 0 4 6 8 10 12 14 16 0 CODE = 3FF HEX 80 60 40 20 4.7 MAX5722 toc14 250 200 150 100 35 40 800 700 600 VDD = +5V 500 400 300 VDD = +3V 100 0 3.2 3.7 4.2 4.7 5.
PAGE 6
MAX5722 12-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface Typical Operating Characteristics (continued) (VREF = VDD, TA = +25°C, unless otherwise noted.
PAGE 7
12-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface POWER-ON RESET, FAST RISE TIME (VDD = +5V) DIGITAL-TO-ANALOG GLITCH IMPULSE (VDD = +3V) MAX5722 toc26 MAX5722 toc25 SCLK, fSCLK = 500kHz 1V/div VDD 2V/div VOUT_ VOUT_ AC-COUPLED, CODE 800 HEX TO 7FF HEX VDD RISE TIME = 20µs 20mV/div AC-COUPLED, 10mV/div 20µs/div 1µs/div POWER-ON RESET, FAST RISE TIME (VDD = +3V) POWER-ON RESET, SLOW RISE TIME (VDD = +5V) MAX5722 toc28 MAX5722 toc27 VDD RISE TIME = 76µs VDD 2V/div VDD 2V/
PAGE 8
MAX5722 12-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface Typical Operating Characteristics (continued) (VREF = VDD, TA = +25°C, unless otherwise noted.
PAGE 9
12-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface PIN NAME FUNCTION 1 VDD Power-Supply Input 2 GND Ground 3 CS Chip-Select Input 4 SCLK Serial-Clock Input 5 DIN Serial Data Input 6 REF External Reference Voltage Input 7, 8 OUTA, OUTB DAC Voltage Outputs. Power-on reset sets DAC register to zero, and internally connects OUT to GND with 100kΩ resistor. Detailed Description The MAX5722 contains two 12-bit, voltage-output, lowpower, digital-to-analog converters (DACs).
PAGE 10
MAX5722 12-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface Table 1.
PAGE 11
12-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface C3 C2 B0 (LSB) 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 3 4 5 6 16 X tOH C3 tCSW tCH C2 C1 C0 D11 D10 D1 D0 X tCSH tCSS CS Figure 2. Timing Diagram +2.7V TO +5.5V R1 R2 V+ +2.7V TO +5.5V REF VDD REF OUT IN VDD VOUT OUT_ DAC_ OUT_ DAC_ MAX6050 GND -V GND MAX5722 Figure 3.
PAGE 12
MAX5722 12-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface Table 2.
PAGE 13
12-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface VDD REF INPUT REGISTER A DAC REGISTER B 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 CONTROL LOGIC AND SHIFT REGISTER POWER-DOWN CONTROL LOGIC MAX5722 CS SCLK DIN GND Power Supply and Layout Considerations Careful PC board layout is important for optimal system performance.
PAGE 14
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 4X S 8 8 INCHES DIM A A1 A2 b E ÿ 0.50±0.1 H c D e E H 0.6±0.1 L 1 1 α 0.6±0.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 0.010 0.014 0.005 0.007 0.116 0.120 0.0256 BSC 0.116 0.120 0.188 0.198 0.016 0.026 0∞ 6∞ 0.0207 BSC 8LUMAXD.