max5722 Maxim Integrated Products, Inc., max5722 Datasheet

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max5722

Manufacturer Part Number
max5722
Description
Max5722 12-bit, Low-power, Dual, Voltage-output Dac With Serial Interface
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
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
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
MAX5722’s reference input accepts a voltage range
from 0 to V
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 100k
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 (1k , 100k , or high
impedance) while in power-down. The MAX5722 is
specified over the -40°C to +125°C automotive temper-
ature range.
19-2124; Rev 2; 7/03
Functional Diagram appears at end of data sheet.
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.
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.
Automatic Tuning
Gain and Offset Adjustment
Power Amplifier Control
Process Control I/O Boards
Battery-Powered Instruments
VCO Control
DD
. In power-down, the reference input is
________________________________________________________________ Maxim Integrated Products
12-Bit, Low-Power, Dual, Voltage-Output
General Description
resistor to ground. This pro-
Applications
®
3mm).
. The
DAC with Serial Interface
o Ultra-Low Power Consumption
o Wide +2.7V to +5.5V Single-Supply Range
o 8-Pin µMAX Package
o 0.3µA Power-Down Current
o Guaranteed 12-Bit Monotonicity (±1LSB DNL)
o Safe Power-Up Reset to Zero Volts at DAC Output
o Three Software-Selectable Power-Down
o Fast 20MHz, 3-Wire SPI, QSPI, and MICROWIRE-
o Rail-to-Rail Output Buffer Amplifiers
o Schmitt-Triggered Logic Inputs for Direct
o Wide -40 C to +125 C Operating Temperature
MAX5722EUA
MAX5722AUA
Impedances (100k , 1k , Hi-Z)
Compatible Serial Interface
Interfacing to Optocouplers
Range
TOP VIEW
PART
112µA at V
135µA at V
SCLK
GND
V
CS
DD
DD
DD
1
2
4
3
-40°C to +85°C
-40°C to +125°C
TEMP RANGE
= +3.6V
= +5.5V
Ordering Information
MAX5722
MAX
Pin Configuration
6
8
7
5
OUTB
OUTA
REF
DIN
8 µMAX
8 µMAX
PIN-PACKAGE
Features
1

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max5722 Summary of contents

Page 1

... The MAX5722’s software-controlled power-down reduces supply current to less than 0.3µA and provides software-selectable output loads (1k , 100k , or high impedance) while in power-down. The MAX5722 is specified over the -40°C to +125°C automotive temper- ature range. Automatic Tuning ...

Page 2

Low-Power, Dual, Voltage-Output DAC with Serial Interface ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V DD OUT_, SCLK, DIN, CS, REF to GND .............-0 Maximum Continuous Current Into Any Pin......................±50mA Continuous Power Dissipation (T = +70°C) ...

Page 3

Low-Power, Dual, Voltage-Output ELECTRICAL CHARACTERISTICS (continued +2.7V to +5.5V, GND = REF V = +5V +25°C PARAMETER SYMBOL DIGITAL INPUTS (SCLK, DIN, CS) Input High Voltage Input Low Voltage Input ...

Page 4

Low-Power, Dual, Voltage-Output DAC with Serial Interface ( +25°C, unless otherwise noted.) REF DD A INTEGRAL NONLINEARITY vs. CODE + + ...

Page 5

... CS INPUT VOLTAGE 900 800 700 600 V = +5V DD 500 400 300 V = +3V DD 200 100 INPUT VOLTAGE (V) FULL-SCALE SETTLING TIME (V = +5V) DD MAX5722 toc18 SCLK OUT_ CODE FFF HEX TO 000 200pF L 1 s/div 40 V SCLK 5V/div V OUT_ 1V/div 5 ...

Page 6

... DD MAX5722 toc20 V SCLK 5V/div V CODE C00 HEX TO OUT_ 1V/div 400 HEX 200pF L 1 s/div (V = +5V) DD MAX5722 toc22 SCLK 500kHz SCLK 2V/div V OUT_ AC-COUPLED, 20mV/div CODE 7FF HEX TO 800 HEX 1 s/div (V = +5V) DD MAX5722 toc24 SCLK 500kHz, SCLK 2V/div V ...

Page 7

... RISE DD V OUT_ AC-COUPLED, 2mV/div (V = +5V) DD MAX5722 toc26 V DD 2V/div V OUT_ AC-COUPLED, V RISE 10mV/div DD TIME = s/div (V = +3V) DD MAX5722 toc28 V DD 2V/div V RISE DD TIME = OUT_ AC-COUPLED, 10mV/div 20 s/div CLOCK FEEDTHROUGH (V = +5V) DD MAX5722 toc30 f = 1MHz SCLK SCLK 2V/div V OUT_ AC-COUPLED, ...

Page 8

... MAX5722 toc31 f = 1MHz SCLK SCLK 2V/div V OUT_ AC-COUPLED, 1mV/div MAX5722 toc33 V DD, AC-COUPLED, 100mV/div V OUT_ AC-COUPLED, 10mV/div (V = +5V) DD MAX5722 toc32 V DD, AC-COUPLED, 100mV/div V OUT_ AC-COUPLED, 10mV/div 20 s/div CROSSTALK (V = +5V) DD MAX5722 toc34 V OUTA 2V/div V OUTB AC-COUPLED, 1mV/div CODE FFF HEX TO 00B HEX 4 s/div ...

Page 9

... This extra time is needed to allow the internal bias to wake-up. Power-down mode reduces current consumption to 0.3µA. . The output voltages The MAX5722 digital interface is a standard 3-wire con- nection compatible with SPI/QSPI/MICROWIRE/DSP interfaces. The chip-select input (CS) frames the serial 12 data loading at DIN ...

Page 10

... The serial clock (SCLK) can idle either high or low between transitions. The MAX5722 has two internal registers per DAC, the input register and the DAC register. The input register holds the data that is waiting to be shifted to the DAC register ...

Page 11

... Figure 3. Typical Operating Circuit, Unipolar Output ______________________________________________________________________________________ DAC with Serial Interface D10 D11 +2.7V TO +5. REF OUT_ DAC_ MAX5722 Figure 4. Bipolar Output Circuit B0 (LSB D10 CSH +2.7V TO +5. OUT_ -V MAX5722 OUT 11 ...

Page 12

Low-Power, Dual, Voltage-Output DAC with Serial Interface Table 2. Serial-Interface Programming Commands CONTROL DATA BITS D11– ...

Page 13

... GND with a 0.1µF capacitor as DD close as possible Chip Information TRANSISTOR COUNT: 7737 PROCESS: BiCMOS ______________________________________________________________________________________ DAC with Serial Interface REF OUTPUT 12-BIT DAC A BUFFER OUTPUT 12-BIT DAC B BUFFER POWER-DOWN CONTROL LOGIC Functional Diagram RESISTOR NETWORK RESISTOR NETWORK MAX5722 OUTA OUTB 13 ...

Page 14

Low-Power, Dual, Voltage-Output DAC with Serial Interface (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages ÿ 0.50±0.1 0.6±0.1 1 0.6±0.1 D ...

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