MCP4821/MCP4822
12-Bit DACs with Internal V
REF
and 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
with LDAC pin
Fast Settling Time of 4.5 µs
Selectable Unity or 2x Gain Output
2.048V Internal Band Gap Voltage Reference
50 ppm/°C V
REF
Temperature Coefficient
2.7V to 5.5V Single-Supply Operation
Extended Temperature Range: -40°C to +125°C
Description
The Microchip Technology Inc. MCP482X devices are
2.7V–5.5V, low-power, low DNL, 12-bit Digital-to-Analog
Converters (DACs) with internal band gap voltage
reference, optional 2x-buffered output and Serial
Peripheral Interface (SPI™).
The MCP482X family of DACs 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 MCP482X devices are available in the extended
temperature range and PDIP, SOIC and MSOP
packages.
The MCP482X 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. The MCP482X family
includes double-buffered registers, allowing simulta-
neous 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
Precision Selectable Voltage Reference
Portable Instrumentation (Battery-Powered)
Calibration of Optical Communication Devices
Package Types
8-Pin PDIP, SOIC, MSOP
CS 2
SCK 3
SDI 4
MCP4821
MCP4822
Block Diagram
CS
SDI
SCK
LDAC
V
DD
1
8 V
OUTA
7 AV
SS
6 SHDN
5 LDAC
Interface Logic
Power-on
Reset
V
DD
AV
SS
Input
Register A
DAC
A
Register
Input
Register B
DAC
B
Register
String
DAC
B
2.048V
V
REF
8-Pin PDIP, SOIC, MSOP
V
DD
1
CS 2
SCK 3
SDI 4
8 V
OUTA
7 AV
SS
6 V
OUTB
5 LDAC
String
DAC
A
Gain
Logic
Output
Op Amps
Output
Logic
Gain
Logic
V
OUTA
SHDN
V
OUTB
©
2005 Microchip Technology Inc.
DS21953A-page 1
MCP4821/MCP4822
1.0
ELECTRICAL
CHARACTERISTICS
† 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.
Absolute Maximum Ratings †
V
DD
.............................................................................................................
6.5V
All inputs and outputs ...................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 -
MCP4821
Input Current
-
MCP4822
Hardware Shutdown Current
Software Shutdown Current
Power-on-Reset Threshold
DC Accuracy
Resolution
INL Error
DNL
(Note 1)
Offset Error
Offset Error Temperature
Coefficient
Gain Error
Gain Error Temperature
Coefficient
Nominal Reference Voltage
Temperature Coefficient
(Note 1)
n
INL
DNL
V
OS
V
OS
/°C
g
E
12
-12
-0.75
-1
—
—
-2
—
—
2
±0.2
±0.02
0.16
-0.44
-0.10
-3
—
12
+0.75
1
—
—
2
—
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
I
SHDN
I
SHDN_SW
V
POR
2.7
—
—
—
—
—
—
330
415
0.3
3.3
2.0
5.5
400
750
2
6
—
µA
µA
µA
V
Digital inputs grounded, Output
unloaded, code = 0x000
Sym
Min
Typ
Max
Units
Conditions
Δ
G/°C
V
REF
Internal Voltage Reference (V
REF
)
2.008
—
—
—
—
Output Noise (V
REF
Noise)
Output Noise Density
E
NREF
(0.1-10 Hz)
e
NREF
(1 kHz)
e
NREF
(10 kHz)
1/f Corner Frequency
Note 1:
2:
f
CORNER
By design, not production tested.
Too small to quantify.
—
—
—
—
2.048
125
0.25
45
0.09
290
1.2
1.0
400
2.088
325
0.65
160
0.32
—
—
—
—
V
ppm/°C
LSb/°C
ppm/°C
LSb/°C
µV
p-p
µV/
√
Hz
µV/
√
Hz
Hz
V
OUTA
when G = 1x and
Code = 0xFFFh
-40°C to 0°C
-40°C to 0°C
0°C to +85°C
0°C to +85°C
Code = 0xFFFh, G = 1
Code = 0xFFFh, G = 1
Code = 0xFFFh, G = 1
Δ
V
REF
/°C
DS21953A-page 2
©
2005 Microchip Technology Inc.
MCP4821/MCP4822
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
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:
By design, not production tested.
Too small to quantify.
—
—
—
—
<10
45
<10
<10
—
—
—
—
nV-s
nV-s
nV-s
nV-s
Note 2
1 LSb change around major carry
(0111...1111 to 1000...0000)
Note 2
Note 2
V
OUT
PM
SR
I
SC
t
SETTLING
—
—
—
—
—
0.010 to
V
DD
– 0.040
66
0.55
15
4.5
—
—
—
24
—
°
V/µs
mA
µs
Within 1/2 LSb of final value from
1/4 to 3/4 full-scale range
Accuracy is better than 1 LSb for
V
OUT
= 10 mV to (V
DD
– 40 mV)
Sym
Min
Typ
Max
Units
Conditions
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 -
MCP4821
Input Current
-
MCP4822
Hardware Shutdown Current
Software Shutdown Current
Power-On Reset threshold
DC Accuracy
Resolution
INL Error
DNL
(Note 1)
Offset Error
Offset Error Temperature
Coefficient
Gain Error
Gain Error Temperature
Coefficient
Note 1:
2:
n
INL
DNL
V
OS
V
OS
/°C
g
E
12
-12
-0.75
-1
—
—
-2
—
—
±3
±0.3
±0.02
0.5
-0.77
-0.15
-3
—
12
0.75
1
—
—
2
—
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 off-
set error
V
DD
I
DD
I
SHDN
I
SHDN_SW
V
POR
2.7
—
—
—
—
—
—
300
415
0.25
2
2.0
5.5
400
750
2
6
—
µA
µA
µA
V
Digital inputs grounded, Output
unloaded, code = 0x000
Sym
Min
Typ
Max
Units
Conditions
Δ
G/°C
By design, not production tested.
Too small to quantify.
©
2005 Microchip Technology Inc.
DS21953A-page 3
MCP4821/MCP4822
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
Internal Voltage Reference (V
REF
)
Nominal Reference Voltage
Temperature Coefficient
(Note 1)
V
REF
2.008
—
—
—
—
Output Noise (V
REF
Noise)
Output Noise Density
E
NREF
(0.1-10 Hz)
e
NREF
(1 kHz)
e
NREF
(10 kHz)
1/f Corner Frequency
Output Amplifier
Output Swing
Phase Margin
Slew Rate
Short Circuit Current
Settling Time
Dynamic Performance
DAC-to-DAC Crosstalk
Major Code Transition Glitch
—
—
<10
45
—
—
nV-s
nV-s
Note 2
1 LSb change around major carry
(
0111...1111 to
1000...0000
)
Note 2
Note 2
V
OUT
PM
SR
I
SC
t
SETTLING
—
—
—
—
—
0.010 to
V
DD
– 0.040
66
0.55
14
4.5
—
—
—
24
—
°
V/µs
mA
µs
Within 1/2 LSb of final value from
1/4 to 3/4 full-scale range
Accuracy is better than 1 LSb for
V
OUT
= 10 mV to (V
DD
– 40 mV)
f
CORNER
—
—
—
—
2.048
125
0.25
45
0.09
290
1.2
1.0
400
2.088
325
0.65
160
0.32
—
—
—
—
V
ppm/°C
LSb/°C
ppm/°C
LSb/°C
µV
p-p
µV/
√
Hz
µV/
√
Hz
Hz
V
OUTA
when G = 1x and
Code = 0xFFFh
-40°C to 0°C
-40°C to 0°C
0°C to +85°C
0°C to +85°C
Code = 0xFFFh, G = 1
Code = 0xFFFh, G = 1
Code = 0xFFFh, G = 1
Sym
Min
Typ
Max
Units
Conditions
Δ
V
REF
/°C
Digital Feedthrough
Analog Crosstalk
Note 1:
2:
By design, not production tested.
Too small to quantify.
—
—
<10
<10
—
—
nV-s
nV-s
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 -
MCP4821
Input Current
-
MCP4822
Hardware Shutdown Current
Software Shutdown Current
Power-On Reset threshold
DC Accuracy
Resolution
INL Error
Note 1:
2:
n
INL
By design, not production tested.
Too small to quantify.
12
—
—
±4
—
—
Bits
LSb
V
DD
I
DD
I
SHDN
I
SHDN_SW
V
POR
2.7
—
—
—
—
—
—
350
440
1.5
5
1.85
5.5
—
—
—
—
µA
µA
µA
V
Digital inputs grounded, Output
unloaded, code = 0x000
Sym
Min
Typ
Max
Units
Conditions
DS21953A-page 4
©
2005 Microchip Technology Inc.
MCP4821/MCP4822
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
DNL
(Note 1)
Offset Error
Offset Error Temperature
Coefficient
Gain Error
Gain Error Temperature
Coefficient
Internal Voltage Reference (V
REF
)
Nominal Reference Voltage
Temperature Coefficient
(Note 1)
V
REF
—
—
—
—
—
Output Noise (V
REF
Noise)
Output Noise Density
E
NREF
(0.1 - 10 Hz)
e
NREF
(1 kHz)
e
NREF
(10 kHz)
1/f Corner Frequency
Output Amplifier
Output Swing
Phase Margin
Slew Rate
Short Circuit Current
Settling Time
Dynamic Performance
DAC-to-DAC Crosstalk
Major Code Transition Glitch
—
—
<10
45
—
—
nV-s
nV-s
Note 2
1 LSb change around major carry
(
0111...1111 to
1000...0000
)
Note 2
Note 2
V
OUT
PM
SR
I
SC
t
SETTLING
—
—
—
—
—
0.010 to
V
DD
– 0.040
66
0.55
17
4.5
—
—
—
—
—
°
V/µs
mA
µs
Within 1/2 LSb of final value from
1/4 to 3/4 full-scale range
Accuracy is better than 1 LSb for
V
OUT
= 10 mV to (V
DD
– 40 mV)
f
CORNER
—
—
—
—
2.048
125
0.25
45
0.09
290
1.2
1.0
400
—
—
—
—
—
—
—
—
—
V
ppm/°C
LSb/°C
ppm/°C
LSb/°C
µV
p-p
µV/
√
Hz
µV/
√
Hz
Hz
V
OUTA
when G = 1x and
Code = 0xFFFh
-40°C to 0°C
-40°C to 0°C
0°C to +85°C
0°C to +85°C
Code = 0xFFFh, G = 1
Code = 0xFFFh, G = 1
Code = 0xFFFh, G = 1
Sym
DNL
V
OS
V
OS
/°C
g
E
Min
—
—
—
—
—
Typ
±0.25
±0.02
-5
-0.10
-3
Max
—
—
—
—
—
Units
LSb
% of FSR
ppm/°C
% of FSR
ppm/°C
Conditions
Device is monotonic
Code 0x000h
+25°C to +125°C
Code 0xFFFh, not including offset
error
Δ
G/°C
Δ
V
REF
/°C
Digital Feedthrough
Analog Crosstalk
Note 1:
2:
By design, not production tested.
Too small to quantify.
—
—
<10
<10
—
—
nV-s
nV-s
©
2005 Microchip Technology Inc.
DS21953A-page 5
京公网安备 11010802033920号
EEWORLD
