参数资料
型号: EVAL-AD7678CBZ
厂商: Analog Devices Inc
文件页数: 2/28页
文件大小: 0K
描述: BOARD EVAL FOR AD7678
标准包装: 1
系列: PulSAR®
ADC 的数量: 1
位数: 18
采样率(每秒): 100k
数据接口: 串行,并联
输入范围: ±VREF
在以下条件下的电源(标准): 31mW @ 100kSPS
工作温度: -40°C ~ 85°C
已用 IC / 零件: AD7678
已供物品:
AD7678
Rev. A | Page 10 of 28
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. 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.
49
(EPAD)
Exposed Pad
(EPAD)
The exposed pad is internally connected to AGND. This connection is not required to meet the
electrical performances; however, for increased reliability of the solder joints, it is recommended that
the pad be soldered to the analog ground of the system.
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
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
OB/2C
All Hi-Z
Serial Interface
R[0:17] is the 18-bit ADC value stored in its output register.
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