Rainbow Electronics MAX5121 - Manual

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General Description
The MAX5120/MAX5121 are low-power, 12-bit, voltage-
output digital-to-analog converters (DACs) with an inter-
nal precision bandgap reference and an output amplifier.
The MAX5120 operates on a +5V supply with an internal
amplifier reference of +2.5V and is capable of a +4.095V
full-scale output range. The MAX5121, operating on +3V,
delivers its +2.0475V full-scale output with an internal
precision reference of +1.25V. If necessary, the user can
override the internal, <10ppm/°C voltage reference with
an external reference. 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 mid-
scale and minimizes output voltage glitches during
power-up.
The serial interface is compatible with SPI™, QSPI™
and MICROWIRE™, which makes the MAX5120/
MAX5121 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 regis-
ter 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) temperature range. For pin-compatible 14-bit
upgrades, see the MAX5170/MAX5172 data sheet;
for pin-compatible 13-bit versions, see the MAX5130/
MAX5131 data sheet.
________________________Applications
Industrial Process Controls
Automatic Test Equipment (ATE)
Digital Offset and Gain Adjustment
Motion Control
µP-Controlled Systems
Features
♦ Single-Supply Operation
+5V (MAX5120)
+3V (MAX5121)
♦ Full-Scale Output Range
+4.095V (MAX5120)
+2.0475V (MAX5121)
♦ Built-In 10ppm/°C (max) Precision Bandgap
Reference
+2.5V (MAX5120)
+1.25V (MAX5121)
♦ Adjustable Output Offset
♦ SPI/QSPI/MICROWIRE-Compatible, 3-Wire Serial
Interface
♦ Pin-Programmable Shutdown Mode and Power-
Up Reset (0V 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
(MAX5130/MAX5131)
♦ Pin-Compatible 14-Bit Upgrades Available
(MAX5170/MAX5172)
MAX5120/MAX5121
+3V/+5V, 12-Bit, Serial Voltage-Output DACs
with Internal Reference
________________________________________________________________ Maxim Integrated Products 1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
OS V DD
REFADJ
REF
AGND
PD
UPO
DOUT
DGND
TOP VIEW
MAX5120
MAX5121
QSOP
OUT
RSTVAL
CS
PDL
CLR
DIN
SCLK
19-1428; Rev 0; 2/99
PART
MAX5120 AEEE
MAX5120BEEE -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
MAX5121 AEEE
MAX5121BEEE
±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.