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| 型号： | EVAL-AD7195EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/45页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7195 |
| 设计资源： | EVAL-AD7195EBZ Schematic AD7195 Gerber Files |
| 标准包装： | 1 |
| 主要目的： | 接口，模拟前端（AFE） |
| 已用 IC / 零件： | AD7195 |
| 次要属性： | 图形用户界面，USB 接口 |
| 已供物品： | 板 |
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AD7195
Rev. 0 | Page 9 of 44
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
AI
N2
NC
AI
N3
NC
AI
N1
AI
N4
NC
ACX1
NC
AGND
AVDD
AINCOM
ACX1
ACX2
AVDD
DGND
REFIN(–)
NC
BPDSW
DVDD
REFIN(+)
NOTES
1. NC = NO CONNECT.
2. CONNECT EXPOSED PAD TO AGND.
AGND
SC
L
K
MC
L
K
2
NC
DO
UT
/R
D
Y
DI
N
SY
N
C
MC
L
K
1
CS
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
AD7195
TOP VIEW
(Not to Scale)
08
77
1-
00
5
Figure 5.Pin Configuration
Table 5. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
ACX2
Digital Output. Provides a signal that can be used to control the reversing of the bridge excitation in ac
excited bridge applications. In ac mode, ACX2 toggles in anti-phase with ACX1. If the ACX bit equals zero (ac
excitation turned off), the ACX2 output remains low. When toggling, it is guaranteed to be nonoverlapping
with ACX1. The nonoverlap interval between ACX1 and ACX2 is 1/(master clock) which is equal to 200 ns
when a 4.92 MHz clock is used.
2
ACX2
Digital Output. Provides a signal that can be used to control the reversing of the bridge excitation in ac
excited bridge applications. This output is the inverse of ACX2. If the ACX bit equals zero (ac excitation turned
off), the ACX2 output remains high.
3
ACX1
Digital Output. Provides a signal that can be used to control the reversing of the bridge excitation in ac
excited bridge applications. When ACX1 is high, the bridge excitation is taken as normal and when ACX1 is
low, the bridge excitation is reversed (chopped). If the Bit ACX equals zero (ac excitation turned off), the ACX1
output remains high.
4
ACX1
Digital Output. Provides a signal that can be used to control the reversing of the bridge excitation in ac
excited bridge applications. This output is the inverse of ACX1. When ACX1 is low, the bridge excitation is
taken as normal and when ACX1 is high, the bridge excitation is reversed (chopped). If the ACX bit equals
zero (ac excitation turned off), the ACX1 output remains low.
5
AVDD
Analog Supply Voltage, 4.75 V to 5.25 V. AVDD is independent of DVDD.
6
AGND
Analog Ground Reference Point.
7
NC
No Connect. This pin should be tied to AGND.
8
AINCOM
Analog inputs AIN1 to AIN4 are referenced to this input when configured for pseudo differential operation.
9
AIN1
Analog Input. This pin can be configured as the positive input of a fully differential input pair when used with
AIN2 or as a pseudo differential input when used with AINCOM.
10
AIN2
Analog Input. This pin can be configured as the negative input of a fully differential input pair when used
with AIN1 or as a pseudo differential input when used with AINCOM.
11
NC
No Connect. This pin should be tied to AGND.
12
NC
No Connect. This pin should be tied to AGND.
13
NC
No Connect. This pin should be tied to AGND.
14
NC
No Connect. This pin should be tied to AGND.
15
AIN3
Analog Input. This pin can be configured as the positive input of a fully differential input pair when used with
AIN4 or as a pseudo differential input when used with AINCOM.
16
AIN4
Analog Input. This pin can be configured as the negative input of a fully differential input pair when used
with AIN3 or as a pseudo differential input when used with AINCOM.
17
REFIN(+)
Positive Reference Input. An external reference can be applied between REFIN(+) and REFIN(). REFIN(+) can
lie anywhere between AVDD and AGND + 1 V. The nominal reference voltage, (REFIN(+) REFIN()), is AVDD,
but the part functions with a reference from 1 V to AVDD.
18
REFIN()
Negative Reference Input. This reference input can lie anywhere between AGND and AVDD 1 V.
19
NC
No Connect. This pin should be tied to AGND.
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