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AD7679AST Fiches technique(PDF) 10 Page - Analog Devices

No de pièce AD7679AST
Description  18-Bit, 2.5 LSB INL, 570 kSPS SAR ADC
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

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AD7679
Pin No.
Mnemonic
Type1
Description
35
CNVST
DI
Start Conversion. If CNVST is held HIGH when the acquisition phase (t8) is complete, the next falling
edge on CNVST puts the internal sample/hold into the hold state and initiates a conversion. If CNVST
is held LOW when the acquisition phase is complete, the internal sample/hold is put into the hold
state and a conversion is started immediately.
36
AGND
P
Must Be Tied to Analog Ground.
37
REF
AI
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.
38
REFGND
AI
Reference Input Analog Ground.
39
IN–
AI
Differential Negative Analog Input.
43
IN+
AI
Differential Positive Analog Input.
46
REFBUFIN
AI
Reference Buffer Input Voltage. The internal reference buffer has a fixed gain. It outputs 4.096 V
typically when 2.5 V is applied on this pin.
48
PDBUF
DI
Allows Choice of Buffering Reference. When LOW, buffer is selected. When HIGH, buffer is
switched off.
1AI = Analog Input; AO = Analog Output; DI = Digital Input; DI/O = Bidirectional Digital; DO = Digital Output; P = Power.
Table 7. Data Bus Interface Definitions
MODE
MODE1
MODE0
D0/OB/2C
D1/A0
D2/A1
D[3]
D[4:9]
D[10:11]
D[12:15]
D[16:17]
Description
0
0
0
R[0]
R[1]
R[2]
R[3]
R[4:9]
R[10:11]
R[12:15]
R[16:17]
18-Bit Parallel
1
0
1
OB/2C
A0:0
R[2]
R[3]
R[4:9]
R[10:11]
R[12:15]
R[16:17]
16-Bit High Word
1
0
1
OB/2C
A0:1
R[0]
R[1]
All Zeros
16-Bit Low Word
2
1
0
OB/2C
A0:0
A1:0
All Hi-Z
R[10:11]
R[12:15]
R[16:17]
8-Bit HIGH Byte
2
1
0
OB/2C
A0:0
A1:1
All Hi-Z
R[2:3]
R[4:7]
R[8:9]
8-Bit MID Byte
2
1
0
OB/2C
A0:1
A1:0
All Hi-Z
R[0:1]
All Zeros
8-Bit LOW Byte
2
1
0
OB/2C
A0:1
A1:1
All Hi-Z
All Zeros
R[0:1]
8-Bit LOW Byte
3
1
1
OB/2C
All Hi-Z
Serial Interface
Serial Interface
R[0:17] is the 18-bit ADC value stored in its output register.
Rev. 0 | Page 10 of 28


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