19-1098; Rev 2; 10/02
Low-Power, Quad, 12-Bit Voltage-Output DAC
with Serial Interface
______________________________Features
o Four 12-Bit DACs with Configurable
Output Amplifiers
Each DAC has a double-buffered input organized as an
input register followed by a DAC register. A 16-bit serial
word loads data into each input/DAC register. The serial
interface is compatible with SPI™/QSPI™ and
MICROWIRE™. It allows the input and DAC registers to
be updated independently or simultaneously with a single software command. The DAC registers can be
simultaneously updated through the 3-wire serial interface. All logic inputs are TTL/CMOS-logic compatible.
o Simultaneous or Independent Control of DACs
through 3-Wire Serial Interface
o +5V Single-Supply Operation
o Low Supply Current: 0.85mA Normal Operation
10µA Shutdown Mode
o Available in 20-Pin SSOP
o Power-On Reset Clears all Registers and
DACs to Zero
o Capable of Recalling Last State Prior to Shutdown
o SPI/QSPI and MICROWIRE Compatible
o User-Programmable Digital Output
_________________Ordering Information
PIN-PACKAGE
INL
(LSB)
0°C to +70°C
20 Plastic DIP
±1/2
0°C to +70°C
20 Plastic DIP
±1
MAX525ACAP
0°C to +70°C
20 SSOP
±1/2
MAX525BCAP
0°C to +70°C
20 SSOP
±1
PART
TEMP RANGE
________________________Applications
MAX525ACPP
Industrial Process Controls
Automatic Test Equipment
Digital Offset and Gain Adjustment
Motion Control
Remote Industrial Controls
Microprocessor-Controlled Systems
MAX525BCPP
Ordering Information continued at end of data sheet.
Pin Configuration appears at end of data sheet.
_________________________________________________________________________Functional Diagram
DOUT CL
PDL
DGND
AGND
VDD
REFAB
FBA
DECODE
CONTROL
MAX525
OUTA
INPUT
REGISTER A
LOGIC
OUTPUT
CS DIN SCLK
UPO
DAC
REGISTER B
DAC B
INPUT
REGISTER C
SR
CONTROL
DAC A
INPUT
REGISTER B
16-BIT
SHIFT
REGISTER
DAC
REGISTER A
DAC
REGISTER C
DAC C
INPUT
REGISTER D
DAC
REGISTER D
DAC D
FBB
OUTB
FBC
OUTC
FBD
OUTD
REFCD
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX525
__________________General Description
The MAX525 combines four low-power, voltage-output,
12-bit digital-to-analog converters (DACs) and four precision output amplifiers in a space-saving, 20-pin package. In addition to the four voltage outputs, each
amplifier’s negative input is also available to the user.
This facilitates specific gain configurations, remote
sensing, and high output drive capacity, making the
MAX525 ideal for industrial-process-control applications. Other features include software shutdown, hardware shutdown lockout, an active-low reset which clears
all registers and DACs to zero, a user-programmable
logic output, and a serial-data output.
