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AD7677 데이터시트(PDF) 10 Page - Analog Devices

부품명 AD7677
상세설명  18-Bit, 2.5 LSB INL, 800 kSPS SAR ADC
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AD7674
Pin No.
Mnemonic
Type1
Description
34
PD
DI
Power-Down Input. When set to a logic HIGH, power consumption is reduced and conversions are
inhibited after the current one is completed.
35
CNVST
DI
Start Conversion. A falling edge on CNVST puts the internal sample/hold into the hold state and initiates
a conversion. In Impulse mode (IMPULSE HIGH, WARP LOW), if CNVST is held LOW when the acquisition
phase (t8) is complete, the internal sample/hold is put into hold and a conversion is immediately started.
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 REF 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.
40–42,
45
NC
No Connect.
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; 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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