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MCP4822 bảng dữ liệu(PDF) 4 Page - Microchip Technology

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Giải thích chi tiết về linh kiện  12-Bit DACs with Internal VREF and SPI??Interface
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MCP4821/MCP4822
DS21953A-page 4
© 2005 Microchip Technology Inc.
Internal Voltage Reference (VREF)
Nominal Reference Voltage
VREF
2.008
2.048
2.088
V
VOUTA when G = 1x and
Code = 0xFFFh
Temperature Coefficient
(Note 1)
ΔV
REF/°C
125
325
ppm/°C
-40°C to 0°C
0.25
0.65
LSb/°C
-40°C to 0°C
45
160
ppm/°C
0°C to +85°C
0.09
0.32
LSb/°C
0°C to +85°C
Output Noise (VREF Noise)
ENREF
(0.1-10 Hz)
290
µVp-p
Code = 0xFFFh, G = 1
Output Noise Density
eNREF
(1 kHz)
—1.2
µV/
Hz
Code = 0xFFFh, G = 1
eNREF
(10 kHz)
—1.0
µV/
Hz
Code = 0xFFFh, G = 1
1/f Corner Frequency
fCORNER
400
Hz
Output Amplifier
Output Swing
VOUT
0.010 to
VDD – 0.040
Accuracy is better than 1 LSb for
VOUT = 10 mV to (VDD – 40 mV)
Phase Margin
PM
66
°
Slew Rate
SR
0.55
V/µs
Short Circuit Current
ISC
—14
24
mA
Settling Time
tSETTLING
4.5
µs
Within 1/2 LSb of final value from
1/4 to 3/4 full-scale range
Dynamic Performance
DAC-to-DAC Crosstalk
<10
nV-s
Note 2
Major Code Transition Glitch
45
nV-s
1 LSb change around major carry
(0111...1111 to
1000...0000
)
Digital Feedthrough
<10
nV-s
Note 2
Analog Crosstalk
<10
nV-s
Note 2
3V AC/DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, VDD = 3V, AVSS = 0V, VREF = 2.048V external, output buffer gain (G) = 1x,
RL = 5 kΩ to GND, CL = 100 pF, TA = -40 to +85°C. Typical values at 25°C
Parameters
Sym
Min
Typ
Max
Units
Conditions
Note
1:
By design, not production tested.
2:
Too small to quantify.
5V EXTENDED TEMPERATURE SPECIFICATIONS
Electrical Specifications: Unless otherwise indicated, VDD = 5V, AVSS = 0V, VREF = 2.048V, output buffer gain (G) = 2x,
RL = 5 kΩ to GND, CL = 100 pF. Typical values at +125°C by characterization or simulation.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Power Requirements
Input Voltage
VDD
2.7
5.5
Input Current - MCP4821
Input Current - MCP4822
IDD
350
440
µA
Digital inputs grounded, Output
unloaded, code = 0x000
Hardware Shutdown Current
ISHDN
—1.5
µA
Software Shutdown Current
ISHDN_SW
—5
—µA
Power-On Reset threshold
VPOR
—1.85
V
DC Accuracy
Resolution
n
12
Bits
INL Error
INL
±4
LSb
Note
1:
By design, not production tested.
2:
Too small to quantify.


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