MAX5122 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – +5V/+3V, 12-Bit, Serial, Force/Sense DACs with 10ppm/°C Internal Reference

19-1446; Rev 0; 3/99
+5V/+3V, 12-Bit, Serial, Force/Sense DACs
with 10ppm/°C Internal Reference
General Description
The MAX5122/MAX5123 low-power, 12-bit, voltage-out-
put, digital-to-analog converters (DACs) feature an inter-
nal precision bandgap reference and output amplifier.
The MAX5122 operates on a single +5V supply with an
internal +2.5V reference, and offers a configurable output
amplifier. If necessary, the user can override the on-chip,
<10ppm/°C voltage reference with an external reference.
The MAX5123 has the same features as the MAX5122 but
operates from a single +3V supply and has an internal
+1.25V precision reference. The user-accessible inverting
input and output of the amplifier allows specific gain con-
figurations, remote sensing, and high output drive capa-
bility for a wide range of force/sense applications. Both
devices draw only 500µA of supply current, which
reduces to 3µA in power-down mode. In addition, their
power-up reset feature allows for a user-selectable initial
output state of either 0V or midscale and reduces output
glitches during power-up.
The serial interface is compatible with SPI™, QSPI™, and
MICROWIRE™, which makes the MAX5122/MAX5123
suitable for cascading multiple devices. Each DAC has
a double-buffered input organized as an input register
followed by a DAC register. A 16-bit shift register loads
data into the input register. The DAC register may be
updated independently or simultaneously with the input
register.
Both devices are available in a 16-pin QSOP package
and are specified for the extended-industrial (-40°C to
+85°C) operating temperature range. For pin-compatible
14-bit upgrades, see the MAX5171/MAX5173 data sheet;
for the pin-compatible 13-bit version, see the MAX5132/
MAX5133 data sheet.
Applications
Industrial Process Control
Automatic Test Equipment
Digital Offset and Gain Adjustment
Motion Control
Microprocessor-Controlled Systems
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
Features
o Single-Supply Operation
+5V (MAX5122)
+3V (MAX5123)
o Built-In 10ppm/°C max Precision Bandgap Reference
+2.5V (MAX5122)
+1.25V (MAX5123)
o SPI/QSPI/MICROWIRE-Compatible, 3-Wire Serial
Interface
o Pin-Programmable Shutdown Mode and Power-
Up Reset (0 or Midscale Output Voltage)
o Buffered Output Capable of Driving 5kΩ 100pF
or 4–20mA Loads
o Space-Saving 16-Pin QSOP Package
o Pin-Compatible 13-Bit Upgrades Available
(MAX5132/MAX5133)
o Pin-Compatible 14-Bit Upgrades Available
(MAX5171/MAX5173)
PART
MAX5122AEEE
MAX5122BEEE
MAX5123AEEE
MAX5123BEEE
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
16 QSOP
16 QSOP
16 QSOP
16 QSOP
INL
(LSB)
±0.5
±1
±1
±2
Pin Configuration
TOP VIEW
FB 1
OUT 2
RSTVAL 3
PDL 4
CLR 5
CS 6
DIN 7
SCLK 8
MAX5122
MAX5123
QSOP
16 V_DD
15 REFADJ
14 REF
13 AGND
12 PD
11 UPO
10 DOUT
9 DGND
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