Microchip MCP4922 Manual de Usario

Microchip No categorizado MCP4922

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2010 Microchip Technology Inc. DS22250A-page 1
MCP4902/4912/4922
Features
• MCP4902: Dual 8-Bit Voltage Output DAC
• MCP4912: Dual 10-Bit Voltage Output DAC
• MCP4922: Dual 12-Bit Voltage Output DAC
• Rail-to-Rail Output
• SPI Interface with 20 MHz Clock Support
• Simultaneous Latching of the Dual DACs
with LDAC pin
• Fast Settling Time of 4.5 µs
• Selectable Unity or 2x Gain Output
• External Voltage Reference Inputs
• External Multiplier Mode
• 2.7V to 5.5V Single-Supply Operation
• Extended Temperature Range: -40°C to +125°C
Applications
• Set Point or Offset Trimming
• Precision Selectable Voltage Reference
• Motor Control Feedback Loop
• Digitally-Controlled Multiplier/Divider
• Calibration of Optical Communication Devices
Related Products(1)
Description
The MCP4902/4912/4922 devices are dual 8-bit,
10-bit, and 12-bit buffered voltage output
Digital-to-Analog Converters (DACs), respectively. The
devices operate from a single 2.7V to 5.5V supply with
SPI compatible Serial Peripheral Interface. The user
can configure the full-scale range of the device to be
VREF or 2 * VREF by setting the Gain Selection Option
bit (gain of 1 of 2).
The user can shut down both DAC channels by using
SHDN pin or shut down the DAC channel individually
by setting the Configuration register bits. In Shutdown
mode, most of the internal circuits in the shutdown
channel are turned off for power savings and the output
amplifier is configured to present a known high
resistance output load (500 ktypical.
The devices include double-buffered registers,
allowing synchronous updates of two DAC outputs,
using the LDAC pin. These devices also incorporate a
Power-on Reset (POR) circuit to ensure reliable power-
up.
The devices utilize a resistive string architecture, with
its inherent advantages of low DNL error and fast
settling time. These devices are specified over the
extended temperature range (+125°C).
The devices provide high accuracy and low noise
performance for consumer and industrial applications
where calibration or compensation of signals (such as
temperature, pressure and humidity) are required.
The MCP4902/4912/4922 devices are available in the
PDIP, SOIC and TSSOP packages.
Package Types
P/N DAC
Resolution
No. of
ChannelS
Voltage
Reference
(VREF)
MCP4801 8 1
Internal
(2.048V)
MCP4811 10 1
MCP4821 12 1
MCP4802 8 2
MCP4812 10 2
MCP4822 12 2
MCP4901 8 1
External
MCP4911 10 1
MCP4921 12 1
MCP4902 8 2
MCP4912 10 2
MCP4922 12 2
Note 1: The products listed here have similar AC/
DC performances.
MCP4902: 8-bit dual DAC
MCP4912: 10-bit dual DAC
MCP4922: 12-bit dual DAC
141
2
3
4
13
12
11
10
9
8
5
6
7
14-Pin PDIP, SOIC, TSSOP
VDD
NC
CS
SCK V
REFB
NC
NC
SDI
LDAC
SHDN
V
OUTB
V
OUTA
V
REFA
V
SS
MCP49X2
8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter
with SPI Interface
MCP4902/4912/4922
DS22250A-page 2 2010 Microchip Technology Inc.
Block Diagram
Op Amps
VDD
VSS
CS SDI SCK
Interface Logic
Input
Register A Register B
Input
DACA
Register Register
DACB
String
DACB
String
DACA
Power-on
Reset
VOUTA VOUTB
LDAC
Output
Gain
Logic
Gain
Logic
Output
Logic
SHDN
VREF A VREF B
Buffer Buffer
2010 Microchip Technology Inc. DS22250A-page 3
MCP4902/4912/4922
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
VDD....................................................................... 6.5V
All inputs and outputs w.r.t .....VSS –0.3V to VDD+0.3V
Current at Input Pins ......................................... ±2 mA
Current at Supply Pins .................................... ±50 mA
Current at Output Pins ....................................±25 mA
Storage temperature ..........................-65°C to +150°C
Ambient temp. with power applied ..... -55°C to +125°C
ESD protection on all pins 4 kV (HBM), 400V (MM)
Maximum Junction Temperature (TJ)................+150°C
† Notice: Stresses above those listed under “Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of
the device at those or any other conditions above those
indicated in the operational listings of this specification
is not implied. Exposure to maximum rating conditions
for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, V DD = 5V, VSS = 0V, VREF = 2.048V, Output Buffer Gain (G) = 2x, RL = 5 k to
GND, CL = 100 pF TA = -40 to +85°C. Typical values are at +25°C.
Parameters Sym Min Typ Max Units Conditions
Power Requirements
Operating Voltage VDD 2.7 — 5.5 V
Operating CurrentInput Cur-
rent
IDD — 350 700 µA VDD = 5V
VDD = 3V
VREF input is unbuffered, all digital
inputs are grounded, all analog
outputs (VOUT) are unloaded.
Code = 000h.
— 250 500 µA
Hardware Shutdown Current ISHDN — 0.3 2 µA Power-on Reset circuit is turned
off
Software Shutdown Current ISHDN_SW — 3.3 6 µA Power-on Reset circuit stays on
Power-on-Reset Threshold VPOR — 2.0 — V
DC Accuracy
MCP4902
Resolution n 8 — — Bits
INL Error INL ±0.125 1 -1 LSb
DNL DNL -0.5 ±0.1 +0.5 LSb Note 1
MCP4912
Resolution n 10 — — Bits
INL Error INL -3.5 ±0.5 3.5 LSb
DNL DNL -0.5 ±0.1 +0.5 LSb Note 1
MCP4922
Resolution n — —12 Bits
INL Error INL -12 ±2 12 LSb
DNL DNL -0.75 ±0.2 +0.75 LSb Note 1
Offset Error VOS — ±0.02 1 % of
FSR
Code = 0x000h
Note 1: Guaranteed monotonic by design over all codes.
2: This parameter is ensured by design, and not 100% tested.

Especificaciones del producto

Marca: Microchip
Categoría: No categorizado
Modelo: MCP4922

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