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PDF MCP4821 Data sheet ( Hoja de datos )
| Número de pieza | MCP4821 | |
| Descripción | (MCP4821 / MCP4822) 12-Bit DACs | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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www.DataSheet4U.com
MCP4821/MCP4822
12-Bit DACs with Internal VREF 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 VREF Temperature Coefficient
• 2.7V to 5.5V Single-Supply Operation
• Extended Temperature Range: -40°C to +125°C
Applications
• Set Point or Offset Trimming
• Sensor Calibration
• Precision Selectable Voltage Reference
• Portable Instrumentation (Battery-Powered)
• Calibration of Optical Communication Devices
Block Diagram
CS SDI SCK LDAC
Interface Logic
Input
Input
Register A Register B
DACA
Register
DACB
Register
Power-on
Reset
VDD
AVSS
2.048V
VREF
String
DACA
String
DACB
Gain
Logic
Output
Op Amps
Output
Logic
Gain
Logic
VOUTA
SHDN
VOUTB
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.
Package Types
8-Pin PDIP, SOIC, MSOP
VDD 1
8 VOUTA
CS 2
SCK 3
7 AVSS
6 SHDN
SDI 4
5 LDAC
8-Pin PDIP, SOIC, MSOP
VDD 1
8 VOUTA
CS 2
SCK 3
7 AVSS
6 VOUTB
SDI 4
5 LDAC
© 2005 Microchip Technology Inc.
DS21953A-page 1
1 page  
MCP4821/MCP4822
www.DataSheet4U.com
5V EXTENDED TEMPERATURE SPECIFICATIONS (CONTINUED)
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
DNL (Note 1)
Offset Error
Offset Error Temperature
Coefficient
Gain Error
DNL
VOS
VOS/°C
gE
Gain Error Temperature
Coefficient
ΔG/°C
Internal Voltage Reference (VREF)
Nominal Reference Voltage
VREF
Temperature Coefficient
(Note 1)
ΔVREF/°C
Output Noise (VREF Noise)
Output Noise Density
1/f Corner Frequency
Output Amplifier
Output Swing
Phase Margin
Slew Rate
Short Circuit Current
Settling Time
Dynamic Performance
ENREF
(0.1 - 10 Hz)
eNREF
(1 kHz)
eNREF
(10 kHz)
fCORNER
VOUT
PM
SR
ISC
tSETTLING
— ±0.25
— ±0.02
— -5
— -0.10
— -3
— 2.048
— 125
— 0.25
— 45
— 0.09
— 290
— 1.2
— 1.0
— 400
— 0.010 to
VDD – 0.040
— 66
— 0.55
— 17
— 4.5
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
LSb
% of FSR
ppm/°C
Device is monotonic
Code 0x000h
+25°C to +125°C
% of FSR
ppm/°C
Code 0xFFFh, not including offset
error
V
ppm/°C
LSb/°C
ppm/°C
LSb/°C
µVp-p
VOUTA 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
µV/√Hz Code = 0xFFFh, G = 1
µV/√Hz Code = 0xFFFh, G = 1
Hz
°
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
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
Note 1: By design, not production tested.
2: Too small to quantify.
© 2005 Microchip Technology Inc.
DS21953A-page 5
5 Page 
MCP4821/MCP4822
www.DataSheet4U.com
Note: Unless otherwise indicated, TA = +25°C, VDD = 5V, AVSS = 0V, VREF = 2.048V, Gain = 2, RL = 5 kΩ, CL = 100 pF.
0.7
5.5V
0.6 5.0V
4.0V
0.5
3.0V
2.7V
VDD
0.4
0.3
0.2
0.1
0
-40 -20 0 20 40 60 80 100 120
Ambient Temperature (ºC)
FIGURE 2-17:
Hardware Shutdown Current
vs. Ambient Temperature and VDD.
-0.05
-0.1
-0.15
-0.2
-0.25
-0.3
-0.35
-0.4
-0.45
-0.5
-40
VDD
5.5V
5.0V
4.0V
3.0V
2.7V
-20 0 20 40 60 80 100 120
Ambient Temperature (ºC)
FIGURE 2-20:
Gain Error vs. Ambient
Temperature and VDD.
4
5.5V
3.5 5.0V
3 4.0V
2.5
3.0V
2 2.7V
VDD
1.5
1
-40 -20
0 20 40 60 80 100 120
Ambient Temperature (ºC)
FIGURE 2-18:
Software Shutdown Current
vs. Ambient Temperature and VDD.
4 VDD
5.5V
3.5
5.0V
3
2.5 4.0V
2
3.0V
1.5 2.7V
1
-40 -20 0 20 40 60 80 100 120
Ambient Temperature (ºC)
FIGURE 2-21:
VIN High Threshold vs.
Ambient Temperature and VDD.
0.11
0.09
0.07
0.05
0.03
0.01
-0.01
-0.03
-40 -20
5.5V
VDD
5.0V
4.0V
3.0V
2.7V
0 20 40 60 80 100 120
Ambient Temperature (ºC)
FIGURE 2-19:
Offset Error vs. Ambient
Temperature and VDD.
1.6 VDD
1.5
5.5V
1.4
5.0V
1.3
1.2
4.0V
1.1
1
3.0V
0.9 2.7V
0.8
-40 -20 0 20 40 60 80 100 120
Ambient Temperature (ºC)
FIGURE 2-22:
VIN Low Threshold vs.
Ambient Temperature and VDD.
© 2005 Microchip Technology Inc.
DS21953A-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MCP4821.PDF ] | |
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