MAX525
19-1098; Rev 2; 10/02
Low-Power, Quad, 12-Bit Voltage-Output DAC
with Serial Interface
__________________General Description ______________________________Features
The MAX525 combines four low-power, voltage-output, Four 12-Bit DACs with Configurable
12-bit digital-to-analog converters (DACs) and four pre-
Output Amplifiers
cision output amplifiers in a space-saving, 20-pin pack-
+5V Single-Supply Operation
age. In addition to the four voltage outputs, each
Low Supply Current: 0.85mA Normal Operation
amplifiers negative input is also available to the user.
This facilitates specific gain configurations, remote 10A Shutdown Mode
sensing, and high output drive capacity, making the
Available in 20-Pin SSOP
MAX525 ideal for industrial-process-control applica-
Power-On Reset Clears all Registers and
tions. Other features include software shutdown, hard-
DACs to Zero
ware shutdown lockout, an active-low reset which clears
all registers and DACs to zero, a user-programmable
Capable of Recalling Last State Prior to Shutdown
logic output, and a serial-data output.
SPI/QSPI and MICROWIRE Compatible
Each DAC has a double-buffered input organized as an
Simultaneous or Independent Control of DACs
input register followed by a DAC register. A 16-bit serial
through 3-Wire Serial Interface
word loads data into each input/DAC register. The serial
interface is compatible with SPI/QSPI and
User-Programmable Digital Output
MICROWIRE. It allows the input and DAC registers to
be updated independently or simultaneously with a sin-
_________________Ordering Information
gle software command. The DAC registers can be
simultaneously updated through the 3-wire serial inter-
INL
PART TEMP RANGE PIN-PACKAGE
face. All logic inputs are TTL/CMOS-logic compatible. (LSB)
MAX525ACPP 0C to +70C 20 Plastic DIP 1/2
________________________Applications
MAX525BCPP 0C to +70C 20 Plastic DIP 1
Industrial Process Controls
MAX525ACAP 0C to +70C 20 SSOP 1/2
Automatic Test Equipment
MAX525BCAP 0C to +70C 20 SSOP 1
Digital Offset and Gain Adjustment
Ordering Information continued at end of data sheet.
Motion Control
Remote Industrial Controls
Pin Configuration appears at end of data sheet.
Microprocessor-Controlled Systems
_________________________________________________________________________Functional Diagram
V
DOUT REFAB
CL PDL DGND AGND DD
FBA
DECODE
MAX525
CONTROL
OUTA
INPUT DAC
DAC A
REGISTER A REGISTER A
FBB
OUTB
INPUT DAC
16-BIT
DAC B
REGISTER B REGISTER B
SHIFT
FBC
REGISTER
OUTC
INPUT DAC
DAC C
REGISTER C REGISTER C
FBD
OUTD
SR
INPUT DAC
LOGIC
DAC D
CONTROL REGISTER D REGISTER D
OUTPUT
CS DIN SCLK UPO REFCD
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Low-Power, Quad, 12-Bit Voltage-Output DAC
with Serial Interface
ABSOLUTE MAXIMUM RATINGS
V to AGND............................................................-0.3V to +6V Operating Temperature Ranges
DD
V to DGND ...........................................................-0.3V to +6V MAX525_C_P ........................................................0C to +70C
DD
AGND to DGND..................................................................0.3V MAX525_E_P .....................................................-40C to +85C
REFAB, REFCD to AGND...........................-0.3V to (V + 0.3V) MAX525_MJP ..................................................-55C to +125C
DD
OUT_, FB_ to AGND...................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-65C to +150C
DD
Digital Inputs to DGND.............................................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C
DOUT, UPO to DGND ................................-0.3V to (V + 0.3V)
DD
Continuous Current into Any Pin.......................................20mA
Continuous Power Dissipation (T = +70C)
A
Plastic DIP (derate 8.00mW/C above +70C) .................640mW
SSOP (derate 8.00mW/C above +70C) ......................640mW
CERDIP (derate 11.11mW/C above +70C).................889mW
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V = +5V 10%, AGND = DGND = 0V, REFAB = REFCD = 2.5V, R = 5k , C = 100pF, T = T to T , unless otherwise
DD L L A MIN MAX
noted. Typical values are at T = +25C. Output buffer connected in unity-gain configuration (Figure 9).)
A
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
STATIC PERFORMANCEANALOG SECTION
Resolution N 12 Bits
MAX525A 0.25 0.5
Integral Nonlinearity
INL LSB
(Note 1)
MAX525B 1.0
Differential Nonlinearity DNL Guaranteed monotonic 1.0 LSB
Offset Error V 6.0 mV
OS
Offset-Error Tempco 6 ppm/C
Gain Error GE (Note 1) -0.8 2.0 LSB
Gain-Error Tempco 1 ppm/C
Power-Supply Rejection Ratio PSRR 4.5V V 5.5V 100 600 V/V
DD
MATCHING PERFORMANCE (T = +25C)
A
Gain Error GE -0.8 2.0 LSB
Offset Error 1.0 6.0 mV
Integral Nonlinearity INL 0.35 1.0 LSB
REFERENCE INPUT
Reference Input Range V 0V - 1.4 V
DD
REF
Reference Input Resistance R Code-dependent, minimum at code 555 hex 8 k
REF
Reference Current in Shutdown 0.01 1 A
2 _______________________________________________________________________________________
MAX525