Microchip MCP4921 Bedienungsanleitung
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MCP4921
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2010 Microchip Technology Inc. DS22248A-page 1
MCP4901/4911/4921
Features
• MCP4901: 8-Bit Voltage Output DAC
• MCP4911: 10-Bit Voltage Output DAC
• MCP4921: 12-Bit Voltage Output DAC
• Rail-to-Rail Output
• SPI Interface with 20 MHz Clock Support
• Simultaneous Latching of the DAC Output
with LDAC Pin
• Fast Settling Time of 4.5 µs
• Selectable Unity or 2x Gain Output
• External Voltage Reference Input
• 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
Description
The MCP4901/4911/4921 devices are single channel
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
an 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 the device by setting the Con-
figuration Register bit. In Shutdown mode, most of the
internal circuits are turned off for power savings, and
the output amplifier is configured to present a known
high resistance output load (500 ktypical.
The devices include double-buffered registers,
allowing synchronous updates of the DAC output 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 Differential Non-Linear-
ity (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 MCP4901/4911/4921 devices are available in the
PDIP, SOIC, MSOP and DFN 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: The products listed here have similar AC/DC
performances.
DFN-8 (2x3)*
1
2
3
4
8
7
6
5
CS
SCK
SDI
VDD
VSS
VOUT
LDAC
MCP4901: 8-bit single DAC
MCP4911: 10-bit single DAC
MCP4921: 12-bit single DAC
MCP49x1
8-Pin PDIP, SOIC, MSOP
1
2
3
4
8
7
6
5
CS
SCK
SDI
VDD
VSS
VOUT
LDAC
VREF VREF
EP
9
* Includes Exposed Thermal Pad (EP); see Table 3-1.
8/10/12-Bit Voltage Output Digital-to-Analog Converter
with SPI Interface
MCP4901/4911/4921
DS22248A-page 2 2010 Microchip Technology Inc.
Block Diagram
Op Amp
VDD
VSS
CS SDI SCK
Interface Logic
Input
Register
DAC
Register
String
DAC
Power-on
Reset
VOUT
LDAC
Output Gain
Logic
Output
Logic
VREF
Buffer
2010 Microchip Technology Inc. DS22248A-page 3
MCP4901/4911/4921
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 T
A = -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
Supply Current IDD — 175 350 µA VDD = 5V
VDD = 3V
VREF input is unbuffered, all digital
inputs are grounded, all analog
outputs (VOUT) are unloaded.
Code = 0x000h
— 125 250 µA
Software Shutdown Current ISHDN_SW — 3.3 6 µA Power-on Reset circuit remains on
Power-On-Reset Threshold VPOR — 2.0 — V
DC Accuracy
MCP4901
Resolution n 8 — — Bits
INL Error INL -1 ±0.125 1 LSb
DNL DNL -0.5 ±0.1 +0.5 LSb Note 1
MCP4911
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
MCP4921
Resolution n 12 — — Bits
INL Error INL -12 ±2 12 LSb
DNL DNL -0.75 ±0.2 +0.75 LSb Note 1
Note 1: Guaranteed monotonic by design over all codes.
2: This parameter is ensured by design, and not 100% tested.
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | MCP4921 |
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