MCP4902 Datasheet PDF - Microchip Technology


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MCP4902
Microchip Technology

Part Number MCP4902
Description 8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter
Page 30 Pages

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MCP4902/4912/4922
8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter
with SPI Interface
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)
P/N
DAC
No. of
Resolution ChannelS
Voltage
Reference
(VREF)
MCP4801
8
1
MCP4811
MCP4821
MCP4802
10
12
8
1
1
Internal
(2.048V)
2
MCP4812
10
2
MCP4822
12
2
MCP4901
8
1
MCP4911
MCP4921
10
12
1
1 External
MCP4902
8
2
MCP4912
10
2
MCP4922
12
2
Note 1: The products listed here have similar AC/
DC performances.
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
14-Pin PDIP, SOIC, TSSOP
VDD 1
NC 2
CS 3
SCK 4
SDI 5
NC 6
14 VOUTA
13 VREFA
12 VSS
11 VREFB
10 VOUTB
9 SHDN
NC 7
8 LDAC
MCP4902: 8-bit dual DAC
MCP4912: 10-bit dual DAC
MCP4922: 12-bit dual DAC
2010 Microchip Technology Inc.
DS22250A-page 1



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MCP4902/4912/4922
Block Diagram
LDAC
CS SDI SCK
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Interface Logic
Input
Register A
Input
Register B
Power-on
Reset
DACA
Register
DACB
Register
VDD
VSS
VREF A
Buffer
Gain
Logic
String
DACA
String
DACB
Output
Op Amps
Output
Logic
Buffer
Gain
Logic
VREF B
VOUTA
SHDN
VOUTB
DS22250A-page 2
2010 Microchip Technology Inc.



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MCP4902/4912/4922
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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, VDD = 5V, VSS = 0V, VREF = 2.048V, Output Buffer Gain (G) = 2x, RL = 5 kto
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
Operating CurrentInput Cur-
rent
VDD
IDD
2.7
350
250
5.5
700
500
Hardware Shutdown Current ISHDN
0.3
2
Software Shutdown Current
Power-on-Reset Threshold
DC Accuracy
MCP4902
Resolution
INL Error
DNL
MCP4912
Resolution
INL Error
DNL
MCP4922
Resolution
INL Error
DNL
Offset Error
ISHDN_SW
VPOR
n
INL
DNL
8
-1
-0.5
n
INL
DNL
10
-3.5
-0.5
n
INL
DNL
VOS
12
-12
-0.75
3.3
2.0
±0.125
±0.1
±0.5
±0.1
±2
±0.2
±0.02
6
1
+0.5
3.5
+0.5
12
+0.75
1
Note 1: Guaranteed monotonic by design over all codes.
2: This parameter is ensured by design, and not 100% tested.
V
µA VDD = 5V
µA VDD = 3V
VREF input is unbuffered, all digital
inputs are grounded, all analog
outputs (VOUT) are unloaded.
Code = 000h.
µA Power-on Reset circuit is turned
off
µA Power-on Reset circuit stays on
V
Bits
LSb
LSb Note 1
Bits
LSb
LSb Note 1
Bits
LSb
LSb
% of
FSR
Note 1
Code = 0x000h
2010 Microchip Technology Inc.
DS22250A-page 3



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MCP4902/4912/4922
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ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, VDD = 5V, VSS = 0V, VREF = 2.048V, Output Buffer Gain (G) = 2x, RL = 5 kto
GND, CL = 100 pF TA = -40 to +85°C. Typical values are at +25°C.
Parameters
Sym Min
Typ
Max Units
Conditions
Offset Error Temperature
Coefficient
Gain Error
VOS/°C
gE
0.16
-0.44
-0.10
1
Gain Error Temperature
Coefficient
G/°C —
-3
Input Amplifier (VREF Input)
Input Range – Buffered
Mode
VREF 0.040 — VDD – 0.040
Input Range – Unbuffered
Mode
VREF
0
VDD
Input Impedance
Input Capacitance –
Unbuffered Mode
RVREF
CVREF
165
7
Multiplier Mode -3 dB
Bandwidth
fVREF
450
fVREF
400
Multiplier Mode –
Total Harmonic Distortion
Output Amplifier
Output Swing
Phase Margin
Slew Rate
Short Circuit Current
Settling Time
THDVREF
-73
VOUT
m
SR
ISC
tsettling
— 0.01 to
VDD – 0.04
— 66
— 0.55
— 15
— 4.5
24
Dynamic Performance (Note 2)
DAC-to-DAC Crosstalk
Major Code Transition Glitch
— 10
— 45
Digital Feedthrough
— 10
Analog Crosstalk
— 10
Note 1: Guaranteed monotonic by design over all codes.
2: This parameter is ensured by design, and not 100% tested.
ppm/°C
ppm/°C
% of
FSR
ppm/°C
-45°C to 25°C
+25°C to 85°C
Code = 0xFFFh, not including off-
set error
V Note 2
Code = 2048
V VREF = 0.2V p-p, f = 100 Hz and
1 kHz
kUnbuffered Mode
pF
kHz VREF = 2.5V ±0.2Vp-p,
Unbuffered, G = 1x
kHz VREF = 2.5V ±0.2 Vp-p,
Unbuffered, G = 2x
dB VREF = 2.5V ±0.2Vp-p,
Frequency = 1 kHz
V
degrees
V/µs
mA
µs
Accuracy is better than 1 LSb for
VOUT = 10 mV to (VDD – 40 mV)
Within 1/2 LSb of final value from
1/4 to 3/4 full-scale range
nV-s
nV-s
nV-s
nV-s
1 LSb change around major carry
(0111...1111 to 1000...0000)
DS22250A-page 4
2010 Microchip Technology Inc.




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