Rainbow Electronics MAX5123 - Manual

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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
Features
♦ Single-Supply Operation
+5V (MAX5122)
+3V (MAX5123)
♦ Built-In 10ppm/°C max Precision Bandgap Reference
+2.5V (MAX5122)
+1.25V (MAX5123)
♦ SPI/QSPI/MICROWIRE-Compatible, 3-Wire Serial
Interface
♦ Pin-Programmable Shutdown Mode and Power-
Up Reset (0 or Midscale Output Voltage)
♦ Buffered Output Capable of Driving 5k
Ω 
100pF
or 4–20mA Loads
♦ Space-Saving 16-Pin QSOP Package
♦ Pin-Compatible 13-Bit Upgrades Available
(MAX5132/MAX5133)
♦ Pin-Compatible 14-Bit Upgrades Available
(MAX5171/MAX5173)
MAX5122/MAX5123
+5V/+3V, 12-Bit, Serial, Force/Sense DACs
with 10ppm/°C Internal Reference
________________________________________________________________ Maxim Integrated Products 1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
FB V DD
REFADJ
REF
AGND
PD
UPO
DOUT
DGND
TOP VIEW
MAX5122
MAX5123
QSOP
OUT
RSTVAL
CS
PDL
CLR
DIN
SCLK
19-1446; Rev 0; 3/99
PART
MAX5122 AEEE
MAX5122BEEE -40°C to +85°C
-40°C to +85°C
TEMP. RANGE
PIN-
PACKAGE
16 QSOP
16 QSOP
Pin Configuration
Ordering Information
INL
(LSB)
±0.5
±1
MAX5123 AEEE
MAX5123BEEE
±1
-40°C to +85°C
-40°C to +85°C 16 QSOP
16 QSOP ±2
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.