MCP4921 Datasheet, PDF (1/40 Pages) Microchip Technology – 12-Bit DAC with SPI™ Interface

MCP4921/4922
12-Bit DAC with SPI™ Interface
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 V_REF 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
CS SDI SCK LDAC
Interface Logic
Input
Input
Register A Register B
V_REF
A
Buffer
Gain
Logic
DAC_A
Register
DAC_B
Register
String
DAC_A
String
DAC_B
Output
Op Amps
Output
Logic
Power-on
Reset
V_DD
AV_SS
V_REF
B
Buffer
Gain
Logic
V_OUTA
SHDN
V_OUTB
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
8-Pin PDIP, SOIC, MSOP
V_{DD 1}
8 V_OUTA
CS 2
SCK ³
7 AV_SS
6 V_REFA
SDI 4
5 LDAC
14-Pin PDIP, SOIC, TSSOP
V_{DD 1}
14 V_OUTA
NC 2
CS 3
SCK 4
13 V_REFA
12 AV_SS
11 V_REFB
SDI 5
10 V_OUTB
NC 6
9 SHDN
NC 7
8 LDAC
 2004 Microchip Technology Inc.
DS21897A-page 1