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參數(shù)資料
| 型號： | EVAL-AD7899CB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Evaluation Board for 5V, 12-Bit, Serial 220kSPS ADC in 8-Pin Package |
| 中文描述： | 評估板為5V，12位，串行220kSPS ADC的8引腳封裝 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大小： | 484K |
| 代理商： | EVAL-AD7899CB |
EVAL-AD7899CB
–4–
REV. 0
E V A L UA T ION B OA R D INT E R F A C ING
Interfacing to the evaluation board is via a 96-way connector,
J1. J1 is used to connect the evaluation board to the EVAL-
BOARD CONT ROL L ER or other system. T he pinout for
the J1 connector is shown in Figure 2 and its pin designations
are given in T able II.
1
32
1
32
A
B
C
Fig. 2. Pin Configuration for the 96-Way Connector, J1
96-Way C onnector Pin D escription
F L 1
Flag one. T his is a logic input and is connected
to the
STBY
pin of the AD7899. A logic high on
this pin allows normal operation of the AD7899.
A logic low on this pin puts the AD7899 into
standby mode.
D 0-D 13
Data Bit 0 to Data Bit 13. Bi-directional data
pins. T hese data bits provide the ADC conversion
results during a read operation.
RD
Read. T his is an active low logic input which is
used in conjunction with the
CS
pin to enable the
data outputs.
WR
Write. A logic input. A rising edge on this input,
with CS low and RD high latches the logic state
on D0-D3 into the channel select register. Soft-
ware selection of channels is not supported by this
evaluation board.
CS
Chip Select. An active low logic input. A low
level on this input selects the AD7899.
F L 0
Flag zero. T his logic input is connected to the
CONVST
input of the AD7899 via LK 7. A low
to high transition on this input puts all the track/
holds into their hold mode and starts conversion
on the selected channels. In addition the state of
the channel sequence selection is also latched on
the rising edge of this input
IRQ2
Interrupt Request 2. T his is a logic output and is
connected to the BUSY logic output on the
AD7899. T his output will go high on the rising
edge of
CONVST
and will return low when
conversion is completed on all selected channels.
D G N D
Digital Ground. T hese lines are connected to the
digital ground plane on the evaluation board. It
allows the user to provide the digital supply via
the connector along with the other digital signals.
A G N D
Analog Ground. T hese lines are connected to the
analog ground plane on the evaluation board.
AV
DD
Analog +5V Supply. T hese lines are connected to
the V
DD
supply line on the board via LK 4.
+12V
+12V Supply. T his line is connected to the +12V
supply line on the board via LK 3.
-12V
-12V Supply. T his line is connected to the -12V
supply line on the board via LK 5.
T able II. 96-Way Connector Pin Functions.
ROW a
RowB
F L 1
D 0
D 1
D G N D
D 2
D 3
D 4
RowC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
SC L K 1
D G N D
SC L K 1
D G N D
RD
D 5
D 6
D 7
D G N D
D 8
D 9
D 10
D G N D
D 11
D 13
WR
CS
D G N D
D G N D
D G N D
F L 0
D 12
D G N D
IRQ2
D G N D
A G N D
A G N D
A G N D
A G N D
A G N D
A G N D
D G N D
A G N D
A G N D
A G N D
A G N D
A G N D
A G N D
A G N D
A G N D
A G N D
A G N D
D G N D
A G N D
A G N D
A G N D
A G N D
A G N D
A G N D
A G N D
-12V
A G N D
+12V
AV D D
AV D D
AV D D
Note : T he unused pins of the 96-way connector are not shown.
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