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MCP4912 Datasheet

Download or read online Microchip Technology MCP4912 8/10/12-Bit Dual Voltage Output Digital-To-Analog Converter With SPI Interface pdf datasheet.



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MCP4902/4912/4922
8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter
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
(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.
with SPI Interface
Description
The MCP4902/4912/4922 devices are dual 8-bit,
10-bit,
and
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
V
or 2 * V
REF
REF
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
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).
Voltage
The devices provide high accuracy and low noise
Reference
performance for consumer and industrial applications
(V
)
where calibration or compensation of signals (such as
REF
temperature, pressure and humidity) are required.
The MCP4902/4912/4922 devices are available in the
PDIP, SOIC and TSSOP packages.
Internal
(2.048V)
Package Types
14-Pin PDIP, SOIC, TSSOP
V
External
SCK
SDI
MCP4902: 8-bit dual DAC
MCP4912: 10-bit dual DAC
MCP4922: 12-bit dual DAC
12-bit
buffered
voltage
output
by setting the Gain Selection Option
include
double-buffered
registers,
V
1
14
DD
OUTA
NC
V
2
13
REFA
CS
3
12
V
SS
V
4
11
REFB
V
5
10
OUTB
SHDN
NC
6
9
NC
7
8
LDAC
DS22250A-page 1

Summary of Contents

Page 1

... MCP4902/4912/4922 8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter 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 • ...

Page 2

... DS22250A-page 2 CS SDI SCK Interface Logic Power-on Reset Input Input Register A Register B DAC DAC A B Register Register String String DAC DAC B A Buffer Gain Logic Output Op Amps Output Logic V V SHDN OUTB OUTA REF 2010 Microchip Technology Inc. ...

Page 3

... Hardware Shutdown Current I SHDN Software Shutdown Current I SHDN_SW Power-on-Reset Threshold V POR DC Accuracy MCP4902 Resolution n INL Error INL DNL DNL MCP4912 Resolution n INL Error INL DNL DNL MCP4922 Resolution n INL Error INL DNL DNL Offset Error V OS Note 1: Guaranteed monotonic by design over all codes. ...

Page 4

... REF Unbuffered 2.5V ±0.2Vp-p, REF Frequency 1 kHz V Accuracy is better than 1 LSb for 40 mV) OUT DD µs 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

... I DD Hardware Shutdown I SHDN Current Software Shutdown Current I SHDN_SW Power-On Reset threshold V POR DC Accuracy MCP4902 Resolution n INL Error INL DNL DNL MCP4912 Resolution n INL Error INL DNL DNL MCP4922 Resolution n INL Error INL DNL DNL Offset Error V OS Offset Error Temperature V /° ...

Page 6

... Unbuffered 2.5V ±0.1 Vp-p, REF Unbuffered 2.5V ±0.1Vp-p, REF Frequency 1 kHz Accuracy is better than 1 LSb for 40 mV) OUT DD 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 7

... Note 1: This parameter is ensured by design and not 100% tested CSSR Mode 1,1 SCK Mode 0 MSb in LDAC FIGURE 1-1: SPI Input Timing Data. 2010 Microchip Technology Inc. MCP4902/4912/4922 2.7V 5.5V Min Typ Max Units 0.7 V — 0 — ...

Page 8

... A T -40 125 ° -65 150 °C A 70 °C/W JA 120 °C/W JA 100 °C exceed the maximum junction temperature GND. SS Conditions Note 1 2010 Microchip Technology Inc. ...

Page 9

... DNL vs. Code and Temperature (MCP4922). 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 0 1024 2048 3072 Code (Decimal) 1 FIGURE 2-3: DNL vs. Code and V Gain 1 (MCP4922). 2010 Microchip Technology Inc. MCP4902/4912/4922 5V 0V 2.048V, Gain 2x REF 0.0766 0.0764 0.0762 0.076 0.0758 0.0756 0.0754 0.0752 0.075 -40 4096 FIGURE 2-4: Temperature (MCP4922) ...

Page 10

... FIGURE 2-11: REF Temperature (MCP4912). 1.5 4 5.5 0.5 -0.5 -1.5 -2.5 -3.5 4096 0 128 FIGURE 2-12: REF Temperature (MCP4912 k 100 pF 1024 2048 3072 4096 Code (Decimal) INL vs. Code (MCP4922). (Figure 2-10) for o o Temp - 125 C 256 384 512 640 768 896 1024 Code DNL vs ...

Page 11

... INL vs. Code and Temperature (MCP4902). 400 350 300 250 200 -40 - Ambient Temperature (ºC) FIGURE 2-15: I vs. Temperature and 2010 Microchip Technology Inc. MCP4902/4912/4922 5V 0V 2.048V, Gain 2x REF FIGURE 2-16: ...

Page 12

... 5.5V 5.0V 4.0V 3.0V 2. 100 120 Ambient Temperature (ºC) Gain Error vs. Ambient . 5.5V 5.0V 4.0V 3.0V 2.7V - 100 120 Ambient Temperature (ºC) V High Threshold 5.5V 5.0V 4.0V 3.0V 2.7V - 100 120 Ambient Temperature (ºC) V Low Threshold 2010 Microchip Technology Inc. ...

Page 13

... Ambient Temperature (ºC) FIGURE 2-26: V High Limit vs. Ambient OUT Temperature and 2010 Microchip Technology Inc. MCP4902/4912/4922 5V 0V 2.048V, Gain 2x REF 0.0045 V DD 5.5V 0.004 5.0V 0.0035 4.0V 0.003 3.0V 0.0025 2.7V 0.002 0.0015 ...

Page 14

... V 2.048V, Gain 2x REF V OUT LDAC Time (1 µs/div) FIGURE 2-33 OUT SCK LDAC Time (1 µs/div) FIGURE 2-34: V Shutdown. Frequency (Hz) FIGURE 2-35: PSRR vs. Frequency k 100 pF Rise Time. OUT Rise Time Exit OUT 2010 Microchip Technology Inc. ...

Page 15

... Worst Case Codes (decimal) FIGURE 2-37 Bandwidth vs. Worst Codes. 2010 Microchip Technology Inc. MCP4902/4912/4922 5V 0V 2.50V, Gain 2x REF 160 D 416 - 672 D 928 D 1184 D 1440 ...

Page 16

... MCP4902/4912/4922 NOTES: DS22250A-page 16 2010 Microchip Technology Inc. ...

Page 17

... Serial Clock Input (SCK) SCK is the SPI compatible serial clock input pin. 3.4 Serial Data Input (SDI) SDI is the SPI compatible serial data input pin. 2010 Microchip Technology Inc. MCP4902/4912/4922 Table 3-1. Function ) OUT ...

Page 18

... MCP4902/4912/4922 NOTES: DS22250A-page 18 2010 Microchip Technology Inc. ...

Page 19

... GENERAL OVERVIEW The MCP4902, MCP4912 and MCP4922 are dual voltage-output 8-bit, 10-bit and 12-bit DAC devices, respectively. These devices include input amplifiers, rail-to-rail output amplifiers, reference buffers for external voltage reference, shutdown reset-management circuitry. The devices use an SPI serial communication interface and operate with a single supply voltage from 2 ...

Page 20

... Transients 0 1 FIGURE 4-3: Typical Transient Response. input to REF and frequency response. ) during the device DD pin, can DD V POR POR Transient Duration Time Transients above the below the V (V) DD POR 2010 Microchip Technology Inc. ...

Page 21

... SHDN pin is brought to high or a write command with bit 1 is latched into the device. When a DAC is changed from Shutdown to Active mode, the output settling time takes less than 10 µs, but more than the standard active mode settling time (4.5 µs). 2010 Microchip Technology Inc. MCP4902/4912/4922 Op Amp Power-Down ...

Page 22

... MCP4902/4912/4922 NOTES: DS22250A-page 22 2010 Microchip Technology Inc. ...

Page 23

... 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. MCP4902/4912/4922 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 24

... MCP4902/4912/4922 REGISTER 5-1: WRITE COMMAND REGISTER FOR MCP4922 (12-BIT DAC) W-x W-x W-x W-0 W-x A/B BUF GA SHDN D11 bit 15 REGISTER 5-2: WRITE COMMAND REGISTER FOR MCP4912 (10-BIT DAC) W-x W-x W-x W-0 W-x A/B BUF GA SHDN D9 bit 15 REGISTER 5-3: WRITE COMMAND REGISTER FOR MCP4902 (8-BIT DAC) W-x W-x W-x W-0 W-x A/B BUF GA SHDN D7 bit 15 Where: bit 15 A/B: DAC or DAC Selection bit ...

Page 25

... SCK config bits BUF SDI A/B GA SHDN D9 LDAC V OUT Note dont care bits FIGURE 5-2: Write Command for MCP4912 (10-bit DAC SCK config bits SDI A/B BUF GA SHDN D7 LDAC V OUT Note dont care bits FIGURE 5-3: Write Command for MCP4902 (8-bit DAC) ...

Page 26

... MCP4902/4912/4922 NOTES: DS22250A-page 26 2010 Microchip Technology Inc. ...

Page 27

... DD The power source supplying these devices should be as clean as possible. If the application circuit has separate digital and analog power supplies should reside on the analog plane. SS 2010 Microchip Technology Inc. MCP4902/4912/4922 µ 0.1 µ REFA ...

Page 28

... Gain selection ( Digital value of DAC (0-255) for MCP4901/MCP4902 n Digital value of DAC (0-1023) for MCP4911/MCP4912 Digital value of DAC (0-4095) for MCP4921/MCP4922   DAC Bit Resolution Decreasing Output Step Size to 0.82V or use a voltage divider on the is an option if the V ...

Page 29

... SPI 3 D  OUT V G ------ REF Gain selection ( Digital value of DAC (0-255) for MCP4901/MCP4902 n Digital value of DAC (0-1023) for MCP4911/MCP4912 Digital value of DAC (0-4095) for MCP4921/MCP4922 N DAC Bit Resolution ------------------ Thevenin ...

Page 30

... OUT DAC R 4 SPI Gain selection ( Digital value of DAC (0-255) for MCP4901/MCP4902 n Digital value of DAC (0-1023) for MCP4911/MCP4912 Digital value of DAC (0-4095) for MCP4921/MCP4922 N DAC Bit Resolution R 2 -------- - k and R 1 Step 4: Next, solve for R 4096, knowing that the output needs ...

Page 31

... DAC (Offset Adjust 0.1uF V – Gain selection ( DAC Bit Resolution Digital value of DAC (0-255) for MCP4902 Digital value of DAC (0-1023) for MCP4912 Digital value of DAC (0-4095) for MCP4922 and ------------------ ...

Page 32

... Example CC 0.1 µ Gain selection ( Digital value of DAC (0- 4096 Since 2 4.2x10 , 22- s V has a resolution of 1 mV, B OUTB by 1000 OUTA needs to be 100 k shown in the equation of 6- 2010 Microchip Technology Inc. ...

Page 33

... REF V V OUT DAC SPI V CC 3-wire G Gain select ( Digital value of DAC (0-255) for MCP4901/MCP4902 n Digital value of DAC (0-1023) for MCP4911/MCP4912 Digital value of DAC (0-4095) for MCP4921/MCP4922 N DAC Bit Resolution REF Load R SENSE ...

Page 34

... EXAMPLE 6-7: MULTIPLIER MODE USING V (a) Single Output DAC: MCP4901 MCP4911 MCP4921 (b) Dual Output DAC: MCP4902 MCP4912 MCP4922 DS22250A-page 34 If the gain selection bit is configured for 1x mode ( 1), the resulting input signal will be attenuated n by D/2 . With the 12-bit DAC (MCP4921 or MCP4922), if the gain is configured for 2x mode ( 0), the codes less than 2048 attenuate the signal, while the codes greater than 2048 gain the signal ...

Page 35

... DEVELOPMENT SUPPORT 7.1 Evaluation and Demonstration Boards TM The Mixed Signal PICtail Demo Board supports the MCP4902/4912/4922 family of devices. Please refer to www.microchip.com for further information on this products capabilities and availability. 2010 Microchip Technology Inc. MCP4902/4912/4922 DS22250A-page 35 ...

Page 36

... MCP4902/4912/4922 NOTES: DS22250A-page 36 2010 Microchip Technology Inc. ...

Page 37

... Note: 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. MCP4902/4912/4922 Example: MCP4922 E/P ...

Page 38

... MCP4902/4912/4922 /HDG 3ODVWLF 'XDO ,Q/LQH 3 ± PLO %RG >3',3@ 1RWH N NOTE 1RWHV DS22250A-page 2010 Microchip Technology Inc. ...

Page 39

... PP %RG >62,&@ 1RWH N NOTE 1RWHV 2010 Microchip Technology Inc. MCP4902/4912/4922 φ α c β DS22250A-page 39 ...

Page 40

... MCP4902/4912/4922 1RWH DS22250A-page 40 2010 Microchip Technology Inc. ...

Page 41

... PP %RG >76623@ 1RWH NOTE 1RWHV 2010 Microchip Technology Inc. MCP4902/4912/4922 φ L DS22250A-page 41 ...

Page 42

... MCP4902/4912/4922 Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging DS22250A-page 42 2010 Microchip Technology Inc. ...

Page 43

... APPENDIX A: REVISION HISTORY Revision A (April 2010) Original Release of this Document. 2010 Microchip Technology Inc. MCP4902/4912/4922 DS22250A-page 43 ...

Page 44

... MCP4902/4912/4922 NOTES: DS22250A-page 44 2010 Microchip Technology Inc. ...

Page 45

... Dual 8-Bit Voltage Output DAC Device: MCP4902T: Dual 8-Bit Voltage Output DAC (Tape and Reel) MCP4912: Dual 10-Bit Voltage Output DAC MCP4912T: Dual 10-Bit Voltage Output DAC (Tape and Reel) MCP4922: Dual 12-Bit Voltage Output DAC MCP4922T: Dual 12-Bit Voltage Output DAC (Tape and Reel) ...

Page 46

... MCP4902/4912/4922 NOTES: DS22250A-page 46 2010 Microchip Technology Inc. ...

Page 47

... 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 48

... 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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