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MCP4921 Datasheet(PDF) 1 Page - Microchip Technology

Part No. MCP4921
Description  12-Bit DAC with SPI™ Interface
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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 1 page
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 2004 Microchip Technology Inc.
DS21897A-page 1
MCP4921/4922
Features
•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 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
Block Diagram
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.
Package Types
Op Amps
VDD
AVSS
CS
SDI
SCK
Interface Logic
Input
Register A Register B
Input
DACA
Register
Register
DACB
String
DACB
String
DACA
VREF
Output
Logic
Power-on
Reset
VREF
A
B
VOUTA
VOUTB
LDAC
Buffer
Buffer
SHDN
Output
Gain
Logic
Gain
Logic
14
8-Pin PDIP, SOIC, MSOP
1
2
3
4
8
7
6
5
CS
SCK
SDI
VDD
AVSS
VOUTA
VREFA
LDAC
1
2
3
4
13
12
11
10
9
8
5
6
7
14-Pin PDIP, SOIC, TSSOP
VDD
NC
CS
SCK
VREFB
NC
NC
SDI
LDAC
SHDN
VOUTB
VOUTA
VREFA
AVSS
12-Bit DAC with SPI™ Interface




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