MCP4921/4922
12-Bit DAC with SPI™ Interface
Features
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12-Bit Resolution
±0.2 LSB DNL (typ)
±2 LSB INL (typ)
Single or Dual Channel
Rail-to-Rail Output
SPI™ Interface with 20 MHz Clock Support
Simultaneous Latching of the Dual DACs w/LDAC
Fast Settling Time of 4.5 µs
Selectable Unity or 2x Gain Output
450 kHz Multiplier Mode
External V
REF
Input
2.7V to 5.5V Single-Supply Operation
Extended Temperature Range: -40°C to +125°C
Description
The Microchip Technology Inc. MCP492X are 2.7 –
5.5V, low-power, low DNL, 12-Bit Digital-to-Analog Con-
verters (DACs) with optional 2x buffered output and SPI
interface.
The MCP492X are DACs that provide high accuracy
and low noise performance for industrial applications
where calibration or compensation of signals (such as
temperature, pressure and humidity) are required.
The MCP492X are available in the extended tempera-
ture range and PDIP, SOIC, MSOP and TSSOP
packages.
The MCP492X devices utilize a resistive string archi-
tecture, with its inherent advantages of low DNL error,
low ratio metric temperature coefficient and fast settling
time. These devices are specified over the extended
temperature range. The MCP492X include double-
buffered inputs, allowing simultaneous updates using
the LDAC pin. These devices also incorporate a
Power-On Reset (POR) circuit to ensure reliable
power-up.
Applications
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Set Point or Offset Trimming
Sensor Calibration
Digitally-Controlled Multiplier/Divider
Portable Instrumentation (Battery-Powered)
Motor Feedback Loop Control
Package Types
8-Pin PDIP, SOIC, MSOP
V
DD
1
Block Diagram
CS
SDI
SCK
LDAC
8 V
OUTA
7 AV
SS
6 V
REFA
5 LDAC
MCP4921
CS 2
V
DD
SCK 3
SDI 4
Interface Logic
Power-on
Reset
AV
SS
Input
Input
Register A Register B
DAC
A
Register
V
REF
A
String
DAC
A
Buffer
Gain
Logic
Output
Op Amps
Output
Logic
String
DAC
B
Buffer
Gain
Logic
DAC
B
Register
V
REF
B
14-Pin PDIP, SOIC, TSSOP
V
DD
1
NC
2
CS
3
SCK
4
SDI
5
NC
6
NC
7
14
V
OUTA
13
V
REFA
12
AV
SS
11
V
REFB
10
V
OUTB
9
SHDN
8
LDAC
MCP4922
V
OUTA
SHDN
V
OUTB
©
2007 Microchip Technology Inc.
DS21897B-page 1
MICROCHIP [ MICROCHIP TECHNOLOGY ]
