MCP4921/4922
12-Bit DAC with SPI™ Interface
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
12-Bit Resolution
±0.2 LSB DNL (typ)
±2 LSB INL (typ)
Single or Dual Channel
Rail-to-Rail Output
SPI™ Interface with 20 MHz Clock Support
Simultaneous Latching of the Dual DACs w/LDAC
Fast Settling Time of 4.5 µs
Selectable Unity or 2x Gain Output
450 kHz Multiplier Mode
External V
REF
Input
2.7V to 5.5V Single-Supply Operation
Extended Temperature Range: -40°C to +125°C
Description
The Microchip Technology Inc. MCP492X are 2.7 –
5.5V, low-power, low DNL, 12-Bit Digital-to-Analog Con-
verters (DACs) with optional 2x buffered output and SPI
interface.
The MCP492X are DACs that provide high accuracy
and low noise performance for industrial applications
where calibration or compensation of signals (such as
temperature, pressure and humidity) are required.
The MCP492X are available in the extended tempera-
ture range and PDIP, SOIC, MSOP and TSSOP
packages.
The MCP492X devices utilize a resistive string archi-
tecture, 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. The MCP492X include double-
buffered inputs, allowing simultaneous updates using
the LDAC pin. These devices also incorporate a
Power-On Reset (POR) circuit to ensure reliable
power-up.
Applications
•
•
•
•
•
Set Point or Offset Trimming
Sensor Calibration
Digitally-Controlled Multiplier/Divider
Portable Instrumentation (Battery-Powered)
Motor Feedback Loop Control
Package Types
8-Pin PDIP, SOIC, MSOP
V
DD
1
Block Diagram
CS
SDI
SCK
LDAC
8 V
OUTA
7 AV
SS
6 V
REFA
5 LDAC
MCP4921
CS 2
V
DD
SCK 3
SDI 4
Interface Logic
Power-on
Reset
AV
SS
Input
Input
Register A Register B
DAC
A
Register
V
REF
A
String
DAC
A
Buffer
Gain
Logic
Output
Op Amps
Output
Logic
String
DAC
B
Buffer
Gain
Logic
DAC
B
Register
V
REF
B
14-Pin PDIP, SOIC, TSSOP
V
DD
1
NC
2
CS
3
SCK
4
SDI
5
NC
6
NC
7
14
V
OUTA
13
V
REFA
12
AV
SS
11
V
REFB
10
V
OUTB
9
SHDN
8
LDAC
MCP4922
V
OUTA
SHDN
V
OUTB
2004 Microchip Technology Inc.
DS21897A-page 1
MCP4921/4922
1.0
ELECTRICAL
CHARACTERISTICS
† Notice:
Stresses above those listed under “Maximum Rat-
ings” 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. Expo-
sure to maximum rating conditions for extended periods may
affect device reliability.
Absolute Maximum Ratings †
V
DD
.............................................................................................................
6.5V
All inputs and outputs w.r.t ............. AV
SS
–0.3V to V
DD
+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 (T
J
) . .........................+150°C
5V AC/DC CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, V
DD
= 5V, AV
SS
= 0V, V
REF
= 2.048V, output buffer gain (G) = 2x, R
L
= 5 kΩ
to GND, C
L
= 100 pF T
A
= -40 to +85°C. Typical values at +25°C.
Parameters
Power Requirements
Input Voltage
Input Current -
MCP4921
Input Current
-
MCP4922
Hardware Shutdown Current
Software Shutdown Current
Power-on-Reset Threshold
DC Accuracy
Resolution
INL Error
DNL
Offset Error
Offset Error Temperature
Coefficient
Gain Error
Gain Error Temperature
Coefficient
Input Amplifier (V
REF
Input)
Input Range - Buffered Mode
Input Range - Unbuffered
Mode
Input Impedance
Input Capacitance -
Unbuffered Mode
Multiplier Mode
-3 dB Bandwidth
V
REF
V
REF
R
VREF
C
VREF
f
VREF
f
VREF
Multiplier Mode -
Total Harmonic Distortion
Note 1:
2:
THD
VREF
0.040
0
—
—
—
—
—
—
—
165
7
450
400
-73
V
DD
– 0.040
V
DD
—
—
—
—
—
V
V
kΩ
pF
kHz
kHz
dB
V
REF
= 2.5V ±0.2Vp-p, Unbuffered,
G=1
V
REF
= 2.5V ±0.2 Vp-p, Unbuffered,
G=2
V
REF
= 2.5V ±0.2Vp-p,
Frequency = 1 kHz
Note 1
Code = 2048
V
REF
= 0.2v p-p, f = 100 Hz and 1 kHz
Unbuffered Mode
n
INL
DNL
V
OS
V
OS
/°C
g
E
12
-12
-0.75
—
—
—
—
—
—
2
±0.2
±0.02
0.16
-0.44
-0.10
-3
—
12
+0.75
1
—
—
1
—
Bits
LSB
LSB
ppm/°C
ppm/°C
Device is Monotonic
-45°C to 25°C
+25°C to 85°C
% of FSR Code 0x000h
V
DD
I
DD
2.7
—
—
—
—
—
—
175
350
0.3
3.3
2.0
5.5
350
700
2
6
—
µA
Input unbuffered, digital inputs
grounded, output unloaded,
code at 0x000
Sym
Min
Typ
Max
Units
Conditions
I
SHDN
I
SHDN_SW
V
POR
µA
µA
V
∆
G/°C
% of FSR Code 0xFFFh, not including offset
error.
ppm/°C
By design, not production tested.
Too small to quantify.
DS21897A-page 2
2004 Microchip Technology Inc.
MCP4921/4922
5V AC/DC CHARACTERISTICS (CONTINUED)
Electrical Specifications:
Unless otherwise indicated, V
DD
= 5V, AV
SS
= 0V, V
REF
= 2.048V, output buffer gain (G) = 2x, R
L
= 5 kΩ
to GND, C
L
= 100 pF T
A
= -40 to +85°C. Typical values at +25°C.
Parameters
Output Amplifier
Output Swing
V
OUT
—
0.010
to V
DD
– 0.040
66
0.55
15
4.5
—
Accuracy is better than 1 LSB for
V
OUT
= 10 mV to (V
DD
– 40 mV)
degrees
V/µs
mA
µs
Within 1/2 LSB of final value from 1/4
to 3/4 full-scale range
Note 2
1 LSB change around major carry
(0111...1111 to 1000...0000)
Note 2
Note 2
Sym
Min
Typ
Max
Units
Conditions
Phase Margin
Slew Rate
Short Circuit Current
Settling Time
Dynamic Performance
DAC-to-DAC Crosstalk
Major Code Transition Glitch
Digital Feedthrough
Analog Crosstalk
Note 1:
2:
θ
m
SR
I
SC
t
settling
—
—
—
—
—
—
24
—
—
—
—
—
10
45
10
10
—
—
—
—
nV-s
nV-s
nV-s
nV-s
By design, not production tested.
Too small to quantify.
3V AC/DC CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, V
DD
= 3V, AV
SS
= 0V, V
REF
= 2.048V external, output buffer gain (G) = 1x,
R
L
= 5 kΩ to GND, C
L
= 100 pF T
A
= -40 to +85°C. Typical values at 25°C
Parameters
Power Requirements
Input Voltage
Input Current -
MCP4921
Input Current
-
MCP4922
Hardware Shutdown Current
Software Shutdown Current
Power-On Reset threshold
DC Accuracy
Resolution
INL Error
DNL
Offset Error
Offset Error Temperature
Coefficient
Gain Error
Gain Error Temperature
Coefficient
Input Amplifier (V
REF
Input)
Input Range - Buffered Mode
Input Range - Unbuffered
Mode
Input Impedance
Note 1:
2:
V
REF
V
REF
R
VREF
0.040
0
—
—
—
165
V
DD
-0.040
V
DD
—
V
V
kΩ
Note 1
Code = 2048,
V
REF
= 0.2v p-p, f = 100 Hz and 1 kHz
Unbuffered Mode
n
INL
DNL
V
OS
V
OS
/°C
g
E
12
-12
-0.75
—
—
—
—
—
—
±3
±0.3
±0.02
0.5
-0.77
-0.15
-3
—
+12
+0.75
1
—
—
1
—
Bits
LSB
LSB
% of FSR
ppm/°C
ppm/°C
% of FSR
ppm/°C
Device is Monotonic
Code 0x000h
-45°C to 25°C
+25°C to 85°C
Code 0xFFFh, not including offset
error.
V
DD
I
DD
2.7
—
—
—
—
—
—
125
250
0.25
2
2.0
5.5
250
500
2
6
—
µA
Input unbuffered, digital inputs
grounded, output unloaded,
code at 0x000
Sym
Min
Typ
Max
Units
Conditions
I
SHDN
I
SHDN_SW
V
POR
µA
µA
V
∆
G/°C
By design, not production tested.
Too small to quantify.
2004 Microchip Technology Inc.
DS21897A-page 3
MCP4921/4922
3V AC/DC CHARACTERISTICS (CONTINUED)
Electrical Specifications:
Unless otherwise indicated, V
DD
= 3V, AV
SS
= 0V, V
REF
= 2.048V external, output buffer gain (G) = 1x,
R
L
= 5 kΩ to GND, C
L
= 100 pF T
A
= -40 to +85°C. Typical values at 25°C
Parameters
Input Capacitance –
Unbuffered Mode
Multiplier Mode
-3 dB Bandwidth
Sym
C
VREF
f
VREF
f
VREF
Multiplier Mode –
Total Harmonic Distortion
Output Amplifier
Output Swing
V
OUT
—
0.010
to V
DD
– 0.040
66
0.55
14
4.5
—
Accuracy is better than 1 LSB for
V
OUT
= 10 mV to (V
DD
– 40 mV)
degrees
V/µs
mA
µs
Within 1/2 LSB of final value from 1/4
to 3/4 full-scale range
Note 2
1 LSB change around major carry
(0111...1111 to 1000...0000)
Note 2
Note 2
THD
VREF
Min
—
—
—
—
Typ
7
440
390
-73
Max
—
—
—
—
Units
pF
kHz
kHz
dB
V
REF
= 2.048V ±0.1 Vp-p, unbuffered,
G=1
V
REF
= 2.048V ±0.1 Vp-p, unbuffered,
G=2
V
REF
= 2.5V ±0.1 Vp-p,
Frequency = 1 kHz
Conditions
Phase Margin
Slew Rate
Short Circuit Current
Settling Time
Dynamic Performance
DAC-to-DAC Crosstalk
Major Code Transition Glitch
Digital Feedthrough
Analog Crosstalk
Note 1:
2:
θ
m
SR
I
SC
t
settling
—
—
—
—
—
—
24
—
—
—
—
—
10
45
10
10
—
—
—
—
nV-s
nV-s
nV-s
nV-s
By design, not production tested.
Too small to quantify.
5V EXTENDED TEMPERATURE SPECIFICATIONS
Electrical Specifications:
Unless otherwise indicated, V
DD
= 5V, AV
SS
= 0V, V
REF
= 2.048V, output buffer gain (G) = 2x, R
L
= 5 kΩ
to GND, C
L
= 100 pF. Typical values at +125°C by characterization or simulation.
Parameters
Power Requirements
Input Voltage
Input Current -
MCP4921
Input Current
-
MCP4922
Hardware Shutdown Current
Software Shutdown Current
Power-On Reset threshold
DC Accuracy
Resolution
INL Error
DNL
Offset Error
Offset Error Temperature
Coefficient
Note 1:
2:
n
INL
DNL
V
OS
V
OS
/°C
12
—
—
—
—
—
±4
±0.25
±0.02
-5
—
—
—
—
—
Bits
LSB
LSB
% of FSR
ppm/°C
Device is Monotonic
Code 0x000h
+25°C to +125°C
V
DD
I
DD
2.7
—
—
—
—
—
—
200
400
1.5
5
1.85
5.5
—
—
—
—
—
µA
Input unbuffered, digital inputs
grounded, output unloaded,
code at 0x000
Sym
Min
Typ
Max
Units
Conditions
I
SHDN
I
SHDN_SW
V
POR
µA
µA
V
By design, not production tested.
Too small to quantify.
DS21897A-page 4
2004 Microchip Technology Inc.
MCP4921/4922
5V EXTENDED TEMPERATURE SPECIFICATIONS (CONTINUED)
Electrical Specifications:
Unless otherwise indicated, V
DD
= 5V, AV
SS
= 0V, V
REF
= 2.048V, output buffer gain (G) = 2x, R
L
= 5 kΩ
to GND, C
L
= 100 pF. Typical values at +125°C by characterization or simulation.
Parameters
Gain Error
Gain Error Temperature
Coefficient
Input Amplifier (V
REF
Input)
Input Range - Buffered Mode
V
REF
—
0.040 to
V
DD
-
0.040
—
174
7
450
400
—
—
V
Note 1
Code = 2048,
V
REF
= 0.2v p-p, f = 100 Hz and 1 kHz
Sym
g
E
Min
—
—
Typ
-0.10
-3
Max
—
—
Units
% of FSR
ppm/°C
Conditions
Code 0xFFFh, not including offset
error
∆
G/°C
Input Range - Unbuffered
Mode
Input Impedance
Input Capacitance -
Unbuffered Mode
Multiplying Mode
-3 dB Bandwidth
V
REF
R
VREF
C
VREF
f
VREF
f
VREF
0
—
—
—
—
—
V
DD
—
—
—
—
—
V
kΩ
pF
kHz
kHz
dB
V
REF
= 2.5V ±0.1 Vp-p, Unbuffered,
G=1
V
REF
= 2.5V ±0.1 Vp-p, Unbuffered,
G=2
V
REF
= 2.5V ±0.1Vp-p,
Frequency = 1 kHz
Accuracy is better than 1 LSB for
V
OUT
= 10 mV to (V
DD
– 40 mV)
degrees
V/µs
mA
µs
Within 1/2 LSB of final value from 1/4
to 3/4 full-scale range
Note 2
1 LSB change around major carry
(0111...1111 to 1000...0000)
Note 2
Note 2
Unbuffered Mode
Multiplying Mode - Total
Harmonic Distortion
Output Amplifier
Output Swing
THD
VREF
V
OUT
—
Phase Margin
Slew Rate
Short Circuit Current
Settling Time
Dynamic Performance
DAC to DAC Crosstalk
Major Code Transition Glitch
Digital Feedthrough
Analog Crosstalk
Note 1:
2:
θ
m
SR
I
SC
t
settling
0.010 to
V
DD
–
0.040
66
0.55
17
4.5
—
—
—
—
—
—
—
—
—
—
—
—
—
10
45
10
10
—
—
—
—
nV-s
nV-s
nV-s
nV-s
By design, not production tested.
Too small to quantify.
2004 Microchip Technology Inc.
DS21897A-page 5
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