19-1428; Rev 0; 2/99
+3 V/+5 V, 1 2 -Bit , S e ria l Vo lt a g e -Ou t p u t DACs
w it h In t e rn a l Re fe re n c e
0/MAX521
Ge n e ra l De s c rip t io n
Fe a t u re s
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.
♦ 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
The serial interface is compatible with SPI™, QSPI™
a nd MICROWIRE™, whic h ma ke s 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.
Interface
♦ Pin-Programmable Shutdown Mode and Power-
Up Reset (0V or Midscale Output Voltage)
♦ Buffered Output Capable of Driving 5kΩ 100pF
or 4–20mA Loads
♦ Space-Saving 16-Pin QSOP Package
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
up g ra d e s , s e e the MAX5170/MAX5172 d a ta s he e t;
for pin-compatible 13-bit versions, see the MAX5130/
MAX5131 data sheet.
♦ Pin-Compatible 13-Bit Upgrades Available
(MAX5130/MAX5131)
♦ Pin-Compatible 14-Bit Upgrades Available
(MAX5170/MAX5172)
________________________Ap p lic a t io n s
Industrial Process Controls
Automatic Test Equipment (ATE)
Digital Offset and Gain Adjustment
Motion Control
µP-Controlled Systems
P in Co n fig u ra t io n
Ord e rin g In fo rm a t io n
PIN-
PACKAGE
INL
(LSB)
TOP VIEW
PART
TEMP. RANGE
OS
OUT
1
2
3
4
5
6
7
8
16 V
DD
MAX5120AEEE
MAX5120BEEE
MAX5121AEEE
MAX5121BEEE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
16 QSOP
16 QSOP
16 QSOP
16 QSOP
±0.5
±1
15 REFADJ
14 REF
RSTVAL
PDL
±1
MAX5120
MAX5121
13 AGND
12 PD
±2
CLR
CS
11 UPO
10 DOUT
DIN
SCLK
9 DGND
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
QSOP
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.