MAX522 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Dual, 8-Bit, Voltage-Output Serial DAC in 8-Pin SO Package

19-0403; Rev 0; 6/95
Dual, 8-Bit, Voltage-Output
Serial DAC in 8-Pin SO Package
_______________General Description
The MAX522 contains two 8-bit, buffered, voltage-output
digital-to-analog converters (DAC A and DAC B) in small
8-pin SO and DIP packages. DAC A’s buffer can source
and sink 5mA, and DAC B’s output can source and sink
500µA, both to within 0.5V of ground and VDD. The
MAX522 operates with a single +2.7V to +5.5V supply.
The device utilizes a 3-wire serial interface, which oper-
ates at clock rates up to 5MHz and is compatible with
SPI™, QSPI™, and Microwire™ interface standards.
The serial input shift register is 16 bits long and con-
sists of eight bits of DAC input data and eight bits for
DAC selection and shutdown control. DAC registers
can be loaded independently or in parallel at the posi-
tive edge of CS.
The MAX522’s ultra-low power consumption and small
8-pin SO package make it ideal for portable and bat-
tery-powered applications. Supply current is less than
1mA and drops below 1µA in shutdown mode. In addi-
tion, the reference input is disconnected from the REF
pin during shutdown, further reducing the system’s total
power consumption. The software format is compatible
with the MAX512/MAX513 triple 8-bit DACs.
________________________Applications
Digital Gain and Offset Adjustment
Programmable Current Source
Programmable Voltage Source
Power-Amp Bias Control
VCO Tuning
__________________Pin Configuration
TOP VIEW
CS 1
SCLK 2
VDD 3
GND 4
MAX522
8 _DIN
7 REF
6 OUTB
5 OUTA
DIP/SO
____________________________Features
o Operates from a Single +2.7V to +5.5V Supply
o Dual Buffered Voltage Output
o Low Power Consumption:
1mA Operating Current
<1µA Shutdown Current
o Independently Programmable Shutdown Mode
o 5MHz, 3-Wire Serial Interface
o SPI™, QSPI™, and Microwire™ Compatible
o Space-Saving 8-Pin SO Package
______________Ordering Information
PART
MAX522CPA
MAX522CSA
MAX522EPA
MAX522ESA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
________________Functional Diagram
SCLK
2
CS
1
0.22µF
8 DIN
3 ^VDD 7 REF
0.1µF
(OPTIONAL)
DAC
LATCH
A
DAC A
DAC
LATCH
B
DAC B
OUTA VOUTA
5
0.1µF
OUTB V_OUTB
6
0.01µF
MAX522
4 GND
SPI and QSPI are trademarks of Motorola Inc.
Microwire is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.