Datasheet

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

General Description

The MAX5721 dual 10-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 accommodate low-

power and low-voltage applications. DAC outputs

employ on-chip precision output amplifiers that swing

rail-to-rail. The MAX5721’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 MAX5721 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 MAX5721’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

MAX5721 is specified over the -40°C to +125°C auto-

motive temperature 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

♦ Tiny 8-Pin µMAX Package

♦ 0.3µA Power-Down Current

♦ Guaranteed 10-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

Interface to Optocouplers

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

Range

MAX5721

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

DAC with Serial Interface

________________________________________________________________ Maxim Integrated Products 1

REF

DINSCLK

OUTB

OUTAGND

µMAX

TOP VIEW

MAX5721

Pin Configuration

19-2125; Rev 3; 4/05

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.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor, Corp.

Ordering Information

PART TEMP RANGE

PIN-PACKAGE

MAX5721EUA -40°C to +85°C 8 µMAX

MAX5721AUA -40°C to +125°C 8 µMAX

Functional Diagram appears at end of data sheet.

Summary of content (14 pages)

PAGE 1
9-2125; Rev 3; 4/05 10-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface The MAX5721 dual 10-bit, low-power, buffered voltageoutput, 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 accommodate lowpower and low-voltage applications. DAC outputs employ on-chip precision output amplifiers that swing rail-to-rail.
PAGE 2
MAX5721 10-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 .........................-40°C to +125°C Junction Temperature .
PAGE 3
10-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) Input High Voltage VIH VDD = +3V, +5V Input Low Voltage VIL VDD = +3V, +5V Input Leakage Current IIN Digital inputs = 0 or VDD 0.7 x VDD V ±0.1 Input Capacitance 0.3 x VDD V ±1 µA 5 pF 0.
PAGE 4
__________________________________________Typical Operating Characteristics (VREF = VDD, TA = +25°C, unless otherwise noted.) 0.20 0.15 2 0.10 DNL (LSB) 0 -1 VDD = +5V -0.05 -0.15 -3 0.8 -0.20 256 512 768 0 VDD = +5V -0.2 -0.4 -0.6 VDD = +3V 256 512 768 1024 0 128 256 384 512 640 768 896 1024 CODE CODE INTEGRAL NONLINEARITY vs. CODE, TA = -40°C DIFFERENTIAL NONLINEARITY vs. CODE, TA = -40°C TOTAL UNADJUSTED ERROR vs. CODE (TA = -40°C) 0.15 2 0.
PAGE 5
10-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface SOURCE-AND-SINK CURRENT CAPABILITY (VDD = +3V) 2.5 0 -1 MINIMUM DNL 1.5 -2 -4 0 20 40 60 80 4 6 8 10 12 14 ISOURCE/SINK (mA) SUPPLY CURRENT vs. SUPPLY VOLTAGE POWER-DOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE 100 80 60 40 20 16 0 2.7 3.2 3.7 4.2 4.7 MAX5721 toc14 250 200 150 100 10 12 14 16 700 600 VDD = +5V 500 400 300 VDD = +3V 100 0 3.2 3.7 4.2 4.7 5.2 SUPPLY VOLTAGE (V) SUPPLY CURRENT vs.
PAGE 6
MAX5721 10-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface Typical Operating Characteristics (continued) (VREF = VDD, TA = +25°C, unless otherwise noted.
PAGE 7
10-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) MAX5721 toc26 MAX5721 toc25 CODE 200 HEX TO 1FF HEX SCLK, fSCLK = 500kHz, 1V/div VDD 2V/div VOUT_ AC-COUPLED, 20mV/div VOUT_ AC-COUPLED, 10mV/div VDD RISE TIME = 20µs 20µs/div 1µs/div POWER-ON RESET, FAST RISE TIME (VDD = +3V) POWER-ON RESET, SLOW RISE TIME (VDD = +5V) MAX5721 toc28 MAX5721 toc27 VDD RISE TIME = 76µs VDD 2V/div VDD 2V/di
PAGE 8
MAX5721 10-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface Typical Operating Characteristics (continued) ( VREF = VDD, TA = +25°C, unless otherwise noted.
PAGE 9
10-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface The MAX5721 contains two 10-bit, voltage-output, lowpower digital-to-analog converters (DACs). Each DAC employs a resistor string architecture that converts a 10-bit digital input word to an equivalent analog output voltage proportional to the applied reference voltage. The MAX5721 shares one reference input (REF) between both DACs.
PAGE 10
MAX5721 10-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface Table 1.
PAGE 11
10-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface CONTROL DATA BITS DAC FUNCTION C3 C2 C1 C0 D9–D0 S1–S0 0 0 0 0 X X A Input register transparent, data shifted directly to DAC register, OUTA updated 0 0 0 1 X X B Input register transparent, data shifted directly to DAC register, OUTB updated 0 1 0 0 X X A Data shifted to input register, OUTA unchanged 0 1 0 1 X X B Data shifted to input register, OUTB unchanged 1 0 0 0 X X A Shift data from in
PAGE 12
MAX5721 10-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface Table 3. Unipolar Code Table Table 4.
PAGE 13
10-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface VDD REF INPUT REGISTER A DAC REGISTER B 10-BIT DAC A OUTPUT BUFFER OUTA RESISTOR NETWORK INPUT REGISTER B DAC REGISTER B 10-BIT DAC B OUTPUT BUFFER OUTB RESISTOR NETWORK INPUT CONTROL LOGIC AND SHIFT REGISTER POWER-DOWN CONTROL LOGIC MAX5721 CS SCLK DIN GND ______________________________________________________________________________________ 13 MAX5721 Functional Diagram
PAGE 14
10-Bit, Low-Power, Dual, Voltage-Output DAC with Serial Interface 8 INCHES DIM A A1 A2 b E Ø0.50±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 0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6∞ 0∞ 0.0207 BSC 8LUMAXD.EPS 4X S 8 MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95 0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0∞ 6∞ 0.