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參數資料
| 型號： | AD7641 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 18-Bit, 2 MSPS SAR ADC |
| 中文描述： | 18位，2 MSPS的SAR型ADC |
| 文件頁數： | 9/24頁 |
| 文件大小： | 324K |
| 代理商： | AD7641 |
Preliminary Technical Data
AD7641
Pin No.
33
Rev. Pr E | Page 9 of 24
Mnemonic
RESET
Type
1
DI
Description
Reset Input. When set to a logic HIGH, reset the AD7641. Current conversion if any is absorbed. If not
used, this pin could be tied to the DGND.
Power-Down Input. When set to a logic HIGH, power consumption is reduced and conversions are
inhibited after the current one is completed.
Start Conversion. A falling edge on CNVST puts the internal sample/hold into the hold state and
initiates a conversion.
Reference Input Voltage and Internal Reference Buffer Output. Apply an external reference on this pin
if the internal reference buffer is not used. Should be decoupled effectively with or without the
internal buffer.
Reference Input Analog Ground.
Differential Negative Analog Input.
Differential Negative Analog Input.
Temperature sensor analog output.
Internal Reference Output and Reference Buffer Input Voltage. The internal reference buffer has a
fixed gain. It outputs 2.048V typically when 1.2V is applied on this pin.
This pin allows the choice of internal or external voltage references. When LOW, the on-chip reference
is turned on. When HIGH, the internal reference is switched off and an external reference must be
used.
This pin allows the choice of buffering an internal or external reference with the internal buffer. When
LOW, the buffer is selected. When HIGH, the buffer is switched off.
34
PD
DI
35
CNVST
DI
37
REF
AI
38
39
43
45
46
REFGND
IN-
IN+
TEMP
REFBUFIN
AI
AI
AI
AO
AI
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 6. Data Bus Interface Definition
MODE
MODE0
MODE1
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]
All Hi-Z
All Hi-Z
All Hi-Z
All Hi-Z
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
R[10:11]
R[2:3]
R[0:1]
R[16:17]
R[8:9]
All Zeros
All Zeros
Serial Interface
R[0:1]
R[0:17] is the 8-bit ADC value stored in its output register.
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