MCP4921/4922
12-Bit DAC with SPI™ Interface
Features
Description
• 12-Bit Resolution
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.
• ±0.2 LSB DNL (typ)
• ±2 LSB INL (typ)
• Single or Dual Channel
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.
• 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
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.
• External VREF Input
• 2.7V to 5.5V Single-Supply Operation
• Extended Temperature Range: -40°C to +125°C
Applications
• 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
Block Diagram
V
V
1
2
3
4
8
7
6
5
DD
OUTA
CS
SDI
SCK LDAC
AV
V
CS
SCK
SDI
SS
REFA
VDD
Power-on
Reset
LDAC
Interface Logic
AVSS
Input
Input
14-Pin PDIP, SOIC, TSSOP
Register A Register B
V
V
V
1
14
DD
OUTA
REFA
NC
CS
2
3
4
13
12
11
DACA
Register
DACB
Register
AV
V
SS
VREF
B
VREF
A
SCK
REFB
String
DACB
String
DACA
V
5
6
7
10
9
SDI
NC
NC
OUTB
SHDN
LDAC
Buffer
Buffer
Gain
Logic
8
Gain
Logic
Output
Op Amps
Output
Logic
VOUTA
VOUTB
SHDN
2004 Microchip Technology Inc.
DS21897A-page 1