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參數(shù)資料
| 型號： | AD7641BCPZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 18-Bit 250/670 kSPS PulSAR Bipolar Programmable Inputs ADC |
| 中文描述： | 1-CH 18-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, QCC48 |
| 封裝： | 7 X 7 MM, LEAD FREE, MO-220VKKD-2, LFCSP-48 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 192K |
| 代理商： | AD7641BCPZ |
AD7631/AD7634
Preliminary Technical Data
Pin
No.
38
39
40
41
43
45
46
Rev. PrC | Page 12 of 14
Mnemonic
REFGND
IN
V
CC
V
EE
IN+
TEMP
REFBUFIN
Type
1
AI
AI
P
P
AI
AO
AI/O
Description
Reference Input Analog Ground.
Differential Negative Analog Input; referenced to IN+.
High Voltage Positive Supply.
High Voltage Negative Supply.
Differential Positive Analog Input; referenced to IN-.
Temperature Sensor Analog Output.
Reference Buffer Input.
When using an external reference with the internal buffer (PDBUF = low, PDREF = high), applying 2.5V
on this pin produces 5V on the REF pin.
When using the internal reference (PDBUF = PDREF = low), this pin should not be connected.
Internal Reference Power-Down Input.
When low, the internal reference is enabled (PDBUF also needs to be low).
When high, the internal reference is powered down and an external reference must been used.
Internal Reference Buffer Power-Down Input.
When low, the buffer is enabled (PDREF also needs to be low).
When high, the buffer is powered-down and an external reference must be used.
47
PDREF
DI
48
PDBUF
DI
1
AI = analog input; AI/O = bidirectional analog; AO = analog output; DI = digital input; DI/O = bidirectional digital; DO = digital output; P = power.
Table 7. Data Bus Interface Definition
MODE
MODE1
MODE0
D0/OB/2C
D1/A0
D2/A1
0
0
0
R[0]
R[1]
R[2]
1
0
1
OB/2C
A0 = 0
R[2]
1
0
1
OB/2C
A0 = 1
R[0]
2
1
0
OB/2C
A0 = 0
A1 = 0
2
1
0
OB/2C
A0 = 0
A1 = 1
2
1
0
OB/2C
A0 = 1
A1 = 0
2
1
0
OB/2C
A0 = 1
A1 = 1
3
1
1
OB/2C
All Hi-Z
D[3]
R[3]
R[3]
R[1]
D[4:9]
R[4:9]
R[4:9]
D[10:11]
R[10:11]
R[10:11]
D[12:15]
R[12:15]
R[12:15]
All Zeros
R[12:15]
R[4:7]
D[16:17]
R[16:17]
R[16:17]
Description
18-Bit Parallel
16-Bit High Word
16-Bit Low Word
8-Bit High Byte
8-Bit Mid Byte
8-Bit Low Byte
8-Bit Low Byte
Serial Interface
All Hi-Z
All Hi-Z
All Hi-Z
All Hi-Z
R[10:11]
R[2:3]
R[0:1]
R[16:17]
R[8:9]
All Zeros
All Zeros
Serial Interface
R[0:1]
Table 8. Input Range Selection. Parallel Mode and Serial Hardware Mode
Range
BIP
TEN
HW/SW (serial
mode)
High
High
High
High
Low
0 - 5V
0 - 10V
±5V
±10V
All Ranges
1
Low
Low
High
High
X
Low
High
Low
High
X
1
In serial mode (MODE[1:0] = 3) when HW/SW = low, the input ranges are defined by registers.
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