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| 型號： | AD7665AST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 16-Bit, 570 kSPS CMOS ADC |
| 中文描述： | 4-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PQFP48 |
| 封裝： | LOW PROFILE, MS-026BBC, QFP-48 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大小： | 348K |
| 代理商： | AD7665AST |
REV. 0
AD7665
–13–
Table III. Output Codes and Ideal Input Voltages
Digital Output Code
(Hexa)
Straight Two’s
Binary
Complement
Description
Analog Input
±
2.5 V
76.3
μ
V
2.499924 V
76.3
μ
V
0 V
–76.3
μ
V
Full-Scale Range
Least Significant Bit 305.2
μ
V
FSR – 1 LSB
Midscale + 1 LSB
Midscale
Midscale – 1 LSB
–FSR + 1 LSB
–FSR
±
10 V
±
5 V
152.6
μ
V
4.999847 V
152.6
μ
V
0 V
–152.6
μ
V
0 V to 10 V
152.6
μ
V
9.999847 V
5.000153 V
5 V
4.999847 V
0 V to 5 V
76.3
μ
V
4.999924 V 2.499962 V
2.570076 V 1.257038 V
2.5 V
2.499924 V 1.249962 V
76.3
μ
V
0 V
0 V to 2.5 V
38.15
μ
V
9.999695 V
305.2
μ
V
0 V
–305.2
μ
V
–9.999695 V –4.999847 V –2.499924 V 152.6
μ
V
–10 V
–5 V
FFFF
1
8001
8000
7FFF
0001
0000
2
7FFF
1
0001
0000
FFFF
8001
8000
2
1.25 V
38.15
μ
V
0 V
–2.5 V
0 V
NOTES
1
This is also the code for an overrange analog input.
2
This is also the code for an underrange analog input.
100nF
10 F
100nF
10 F
AVDD
10 F
100nF
AGND
DGND
DVDD
OVDD
OGND
SER/
PAR
CNVST
BUSY
SDOUT
SCLK
RD
CS
RESET
PD
REFGND
C
REF
NOTE 2
2.5V REF
NOTE 1
REF
100
D
CLOCK
AD7665
C/ P/DSP
SERIAL
PORT
DIGITAL SUPPLY
(3.3V OR 5V)
ANALOG
SUPPLY
(5V)
DVDD
OB/
2C
NOTE 8
BYTESWAP
DVDD
50k
100nF
1M
INA
100nF
U2
+
IND
INGND
ANALOG
INPUT
( 10V)
C
C
2.7nF
U1
+
15
10 F
NOTE 3
NOTE 7
NOTE 4
50
INC
INB
N6
NOTES :
1. SEE VOLTAGE REFERENCE INPUT CHAPTER.
2. WITH THE RECOMMENDED VOLTAGE REFERENCES, C
IS 47 F. SEE SECTION VOLTAGE REFERENCE INPUT SECTION.
3. OPTIONAL CIRCUITRY FOR HARDWARE GAIN CALIBRATION.
4. FOR BIPOLAR RANGE ONLY. SEE SCALER REFERENCE INPUT SECTION.
5. THE AD8021 IS RECOMMENDED. SEE DRIVER AMPLIFIER CHOICE SECTION.
6. WITH 0 TO 2.5V RANGE ONLY. SEE ANALOG INPUTS SECTION.
7. OPTION. SEE POWER SUPPLY SECTION.
8. OPTIONAL LOW JITTER
CNVST
. SEE CONVERSION CONTROL SECTION.
+
+
+
+
+
AD8031
AD8021
50
ADR421
NOTE 5
WARP
IMPULSE
Figure 5. Typical Connection Diagram (
±
10 V Range Shown)
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