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MCP4812 Datasheet

Download or read online Microchip Technology MCP4812 8/10/12-Bit Dual Voltage Output Digital-To-Analog Converter With Internal VREF And SPI Interface pdf datasheet.



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MCP4802/4812/4822
8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter
with Internal V
Features
• MCP4802: Dual 8-Bit Voltage Output DAC
• MCP4812: Dual 10-Bit Voltage Output DAC
• MCP4822: 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
• 2.048V Internal Voltage Reference
• 50 ppm/°C V
Temperature Coefficient
REF
• 2.7V to 5.5V Single-Supply Operation
• Extended Temperature Range: -40°C to +125°C
Applications
• Set Point or Offset Trimming
• Sensor Calibration
• Precision Selectable Voltage Reference
• Portable Instrumentation (Battery-Powered)
• Calibration of Optical Communication Devices
(1)
Related Products
DAC
No. of
P/N
Resolution
Channels
MCP4801
8
1
MCP4811
10
1
MCP4821
12
1
MCP4802
8
2
MCP4812
10
2
MCP4822
12
2
MCP4901
8
1
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.
 2010 Microchip Technology Inc.
and SPI Interface
REF
Description
The MCP4802/4812/4822 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 devices have a high precision internal voltage
reference (V
REF
full-scale range of the device to be 2.048V or 4.096V by
setting the Gain Selection Option bit (gain of 1 of 2).
Each DAC channel can be operated in Active or
Shutdown mode 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
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, low ratio
metric temperature coefficient and fast settling time.
These devices are specified over the extended
temperature range (+125°C).
The devices provide high accuracy and low noise
Voltage
performance for consumer and industrial applications
Reference
where calibration or compensation of signals (such as
(V
)
temperature, pressure and humidity) are required.
REF
The MCP4802/4812/4822 devices are available in the
PDIP, SOIC and MSOP packages.
Internal
Package Types
(2.048V)
8-Pin PDIP, SOIC, MSOP
V
CS
SCK
SDI
External
MCP4802: 8-bit dual DAC
MCP4812: 10-bit dual DAC
MCP4822: 12-bit dual DAC
= 2.048V). The user can configure the
include
double-buffered
registers,
V
1
8
DD
OUTA
2
7
V
SS
V
3
6
OUTB
4
5
LDAC
DS22249A-page 1

Summary of Contents

Page 1

... Dual Voltage Output Digital-to-Analog Converter with Internal V Features MCP4802: Dual 8-Bit Voltage Output DAC MCP4812: Dual 10-Bit Voltage Output DAC MCP4822: Dual 12-Bit Voltage Output DAC Rail-to-Rail Output SPI Interface with 20 MHz Clock Support • ...

Page 2

... DS22249A-page 2 CS SDI SCK LDAC Power-on Interface Logic Reset Input Input Register A Register B 2.048V V REF DAC DAC A B Register Register String String DAC DAC A B Gain Logic Output Op Amps Output Logic V V OUTB OUTA 2010 Microchip Technology Inc. ...

Page 3

... V DD Input Current I DD Software Shutdown Current I SHDN_SW Power-on Reset Threshold V POR DC Accuracy MCP4802 Resolution n INL Error INL DNL DNL MCP4812 Resolution n INL Error INL DNL DNL MCP4822 Resolution n INL Error INL DNL DNL Offset Error V OS Offset Error Temperature V /°C ...

Page 4

... Code 0xFFFh Code 0xFFFh Code 0xFFFh Accuracy is better than 1 LSb for 40 mV) OUT DD  400 pF Within 1/2 LSb of final value from 1/4 to 3/4 full-scale range 1 LSb change around major carry (0111...1111 to 1000...0000) 2010 Microchip Technology Inc. ...

Page 5

... Input Current I DD Input Curren Software Shutdown Current I SHDN_SW Power-On Reset threshold V POR DC Accuracy MCP4802 Resolution n INL Error INL DNL DNL MCP4812 Resolution n INL Error INL DNL DNL MCP4822 Resolution n INL Error INL DNL DNL Offset Error V OS Offset Error Temperature V /° ...

Page 6

... LDAC CS SDI SCK 5.0V 25° MHz (Note 1) CLK MHz T 25°C (Note Note 1 Note Applies only when CS falls with CLK high. (Note 1) ns Note 1 ns Note 1 ns Note 1 2010 Microchip Technology Inc. ...

Page 7

... Thermal Resistance, 8L-MSOP Thermal Resistance, 8L-PDIP Thermal Resistance, 8L-SOIC Note 1: The MCP4802/4812/4822 devices operate over this extended temperature range, but with reduced performance. Operation in this range must not cause T of 150°C. 2010 Microchip Technology Inc. MCP4802/4812/4822 2.7V 5.5V Min Typ Max 15 — ...

Page 8

... MCP4802/4812/4822 NOTES: DS22249A-page 8 2010 Microchip Technology Inc. ...

Page 9

... Temperature (MCP4822). 0.0766 0.0764 0.0762 0.076 0.0758 0.0756 0.0754 0.0752 0.075 -40 - Ambient Temperature (ºC) FIGURE 2-3: Absolute DNL vs. Temperature (MCP4822). 2010 Microchip Technology Inc. MCP4802/4812/4822 5V 0V 2.048V, Gain 2x REF 4096 ...

Page 10

... C 0 -0 -2.5 o 125 128 256 384 512 640 768 Code FIGURE 2-8: INL vs. Code and Temperature (MCP4812). 0.15 o Temperature 125 0.1 0. -0.05 -0.1 -0. 128 160 192 224 256 Code FIGURE 2-9: DNL vs. Code and Temperature (MCP4802). DS22249A-page 2.048V, Gain 2x, R ...

Page 11

... REF 340 320 300 280 260 240 220 200 180 -40 - Ambient Temperature (°C) FIGURE 2-15: I vs. Temperature and V DD 2010 Microchip Technology Inc. MCP4802/4812/4822 5V 0V 2.048V, Gain 2x REF 10k 100k 1E4 1E5 FIGURE 2-16 ...

Page 12

... FIGURE 2-22: Temperature and 5.5V 5.0V 4.0V 3.0V 2.7V 100 120 5 k 100 pF 5.5V 5.0V 4.0V 3.0V 2. 100 120 Ambient Temperature (ºC) V High Threshold vs 5.5V 5.0V 4.0V 3.0V 2. 100 120 Ambient Temperature (ºC) V Low Threshold vs 2010 Microchip Technology Inc. ...

Page 13

... Ambient Temperature (ºC) FIGURE 2-25: V Low Limit vs. OUT Temperature and 2010 Microchip Technology Inc. MCP4802/4812/4822 5V 0V 2.048V, Gain 2x REF 5.5V 15 5.0V 14 4.0V 13 3. 100 120 ...

Page 14

... V 2.048V, Gain 2x REF V OUT LDAC Time (1 µs/div) FIGURE 2-31 OUT SCK LDAC Time (1 µs/div) FIGURE 2-32: V Shutdown. Frequency (Hz) FIGURE 2-33: PSRR vs. Frequency k 100 pF Rise Time. OUT Rise Time Exit OUT 2010 Microchip Technology Inc. ...

Page 15

... Chip Select (CS the Chip Select input pin, which requires an active-low to enable serial clock and data functions. 3.3 Serial Clock Input (SCK) SCK is the SPI compatible serial clock input pin. 2010 Microchip Technology Inc. MCP4802/4812/4822 Table 3-1. Description Supply Voltage Input (2.7V to 5.5V) Chip Select Input ...

Page 16

... MCP4802/4812/4822 NOTES: DS22249A-page 16 2010 Microchip Technology Inc. ...

Page 17

... GENERAL OVERVIEW The MCP4802, MCP4812 and MCP4822 are dual voltage output 8-bit, 10-bit and 12-bit DAC devices, respectively. These devices include rail-to-rail output amplifiers, internal voltage reference, shutdown and reset-management circuitry. The devices use an SPI serial communication interface and operate with a sin- gle supply voltage from 2 ...

Page 18

... REF 4.1.2 VOLTAGE REFERENCE The MCP4802/4812/4822 devices utilize internal 2.048V voltage reference. The voltage reference has a low temperature coefficient and characteristics. Refer to Section 1.0 Electrical Char- acteristics for the voltage reference specifications. 2010 Microchip Technology Inc. to OUT low noise ...

Page 19

... (V) DD POR FIGURE 4-3: Typical Transient Response. 2010 Microchip Technology Inc. MCP4802/4812/4822 4.1.4 SHUTDOWN MODE The user can shut down each DAC channel selectively using a software command ( 0). During Shutdown mode, most of the internal circuits in the channel that was shut down are turned off for power savings ...

Page 20

... MCP4802/4812/4822 NOTES: DS22249A-page 20 2010 Microchip Technology Inc. ...

Page 21

... Refer to Figure 1-1 and SPI Timing Specifications Table for detailed input and output timing specifications for both Mode 0,0 and Mode 1,1 operation. 2010 Microchip Technology Inc. MCP4802/4812/4822 5.2 Write Command The write command is initiated by driving the CS pin low, followed by clocking the four Configuration bits and the 12 data bits into the SDI pin on the rising edge of SCK ...

Page 22

... MCP4802/4812/4822 REGISTER 5-1: WRITE COMMAND REGISTER FOR MCP4822 (12-BIT DAC) W-x W-x W-x W-0 W-x A/B GA SHDN D11 bit 15 REGISTER 5-2: WRITE COMMAND REGISTER FOR MCP4812 (10-BIT DAC) W-x W-x W-x W-0 W-x A/B GA SHDN D9 bit 15 REGISTER 5-3: WRITE COMMAND REGISTER FOR MCP4802 (8-BIT DAC) W-x W-x W-x W-0 W-x A/B GA SHDN D7 bit 15 Where: bit 15 A/B: DAC or DAC Selection bit ...

Page 23

... SCK config bits SDI A/B GA SHDN D9 LDAC V OUT Note dont care bits. FIGURE 5-2: Write Command for MCP4812 (10-bit DAC SCK config bits SDI A/B GA SHDN D7 LDAC V OUT Note dont care bits. ...

Page 24

... MCP4802/4812/4822 NOTES: DS22249A-page 24 2010 Microchip Technology Inc. ...

Page 25

... The power source supplying these devices should be as clean as possible. If the application circuit has separate digital and analog power supplies the device should reside on the analog plane. SS 2010 Microchip Technology Inc. MCP4802/4812/4822 6.3 Output Noise Considerations The voltage noise density (in µV/Hz) is illustrated in Figure 2-13 ...

Page 26

... Gain selection ( Digital value of DAC (0-255) for MCP4801/MCP4802 n Digital value of DAC (0-1023) for MCP4811/MCP4812 Digital value of DAC (0-4095) for MCP4821/MCP4822  DAC bit resolution Decreasing Output Step Size to 0.82V (using the MCP49XX family is an option if the V ...

Page 27

... SPI 3-wire D  OUT 2.048 G ------ Gain selection ( Digital value of DAC (0-255) for MCP4801/MCP4802 n Digital value of DAC (0-1023) for MCP4811/MCP4812 Digital value of DAC (0-4095) for MCP4821/MCP4822 N DAC bit resolution ------------------ - Thevenin ...

Page 28

... V 3 OUT DAC R 4 3-wire G Gain selection ( Digital value of DAC (0-255) for MCP4801/MCP4802 n Digital value of DAC (0-1023) for MCP4811/MCP4812 Digital value of DAC (0-4095) for MCP4821/MCP4822 N DAC bit resolution The equation can be simplified to: -------- - k and R 1 ...

Page 29

... Offset Adjust – Gain selection ( DAC bit resolution Digital value of DAC (0-255) for MCP4802 Digital value of DAC (0-1023) for MCP4812 Digital value of DAC (0-4095) for MCP4822 R 2 ----- -  and CC ...

Page 30

... Gain selection ( Digital value of DAC (0-4096 Since resolution is desired. Since s V has a resolution of 1 mV, B OUTB by 1000 OUTA s DNL error. needs to be 100 k. 1 Example 6- CC 2010 Microchip Technology Inc ...

Page 31

... OUT DAC SPI V CC 3-wire G Gain selection ( Digital value of DAC (0-255) for MCP4801/MCP4802 n Digital value of DAC (0-1023) for MCP4811/MCP4812 Digital value of DAC (0-4095) for MCP4821/MCP4822 N DAC bit resolution REF Load R SENSE DS22249A-page 31 ...

Page 32

... MCP4802/4812/4822 NOTES: DS22249A-page 32 2010 Microchip Technology Inc. ...

Page 33

... DEVELOPMENT SUPPORT 7.1 Evaluation and Demonstration Boards The Mixed Signal PICtail Demo Board supports the MCP4802/4812/4822 family of devices. Refer to www.microchip.com for further information on this products capabilities and availability. 2010 Microchip Technology Inc. MCP4802/4812/4822 DS22249A-page 33 ...

Page 34

... MCP4802/4812/4822 NOTES: DS22249A-page 34 2010 Microchip Technology Inc. ...

Page 35

... In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. 2010 Microchip Technology Inc. MCP4802/4812/4822 Example: 4822E 009256 Example: MCP4802 E/P 256 e 3 1009 Example: MCP4812E SN 1009 e 3 256 ) e 3 DS22249A-page 35 ...

Page 36

... MCP4802/4812/4822 /HDG 3ODVWLF 0LFUR 6PDOO 2XWOLQH 3DFNDJH 06 >0623@ 1RWH NOTE 1RWHV DS22249A-page φ L 2010 Microchip Technology Inc. ...

Page 37

... Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging 2010 Microchip Technology Inc. MCP4802/4812/4822 DS22249A-page 37 ...

Page 38

... MCP4802/4812/4822 /HDG 3ODVWLF 'XDO ,Q/LQH 3 ± PLO %RG >3',3@ 1RWH N NOTE 1RWHV DS22249A-page 2010 Microchip Technology Inc. ...

Page 39

... PP %RG >62,&@ 1RWH N NOTE 1RWHV 2010 Microchip Technology Inc. MCP4802/4812/4822 φ α c β DS22249A-page 39 ...

Page 40

... MCP4802/4812/4822 /HDG 3ODVWLF 6PDOO 2XWOLQH 61 ± 1DUURZ PP %RG >62,&@ 1RWH DS22249A-page 40 2010 Microchip Technology Inc. ...

Page 41

... APPENDIX A: REVISION HISTORY Revision A (April 2010) Original Release of this Document. 2010 Microchip Technology Inc. MCP4802/4812/4822 DS22249A-page 41 ...

Page 42

... MCP4802/4812/4822 NOTES: DS22249A-page 42 2010 Microchip Technology Inc. ...

Page 43

... SN 8-Lead Plastic Small Outline - Narrow, 150 mil (SOIC) 2010 Microchip Technology Inc. MCP4802/4812/4822 Examples: a) MCP4802-E/MS: b) MCP4802T-E/MS: Extended temperature, c) MCP4802-E/P: d) MCP4802-E/SN: e) MCP4802T-E/SN: a) MCP4812-E/MS: b) MCP4812T-E/MS: Extended temperature, (Extended) c) MCP4812-E/P: d) MCP4812-E/SN: e) MCP4812T-E/SN: a) MCP4822-E/MS: b) MCP4822T-E/MS: Extended temperature, c) MCP4822-E/P: d) MCP4822-E/SN: e) MCP4822T-E/SN: . Extended temperature, MSOP package. ...

Page 44

... MCP4802/4812/4822 NOTES: DS22249A-page 44 2010 Microchip Technology Inc. ...

Page 45

... PICtail, REAL ICE, rfLAB, Select Mode, Total Endurance, TSHARC, UniWinDriver, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2010, Microchip Technology Incorporated, Printed in the U ...

Page 46

... Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 2010 Microchip Technology Inc. EUROPE Austria - Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris ...

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