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AD7655-EP 数据表(PDF) 8 Page - Analog Devices

部件名 AD7655-EP
功能描述  Low Cost, 4-Channel, 16-Bit 1 MSPS PulSAR ADC
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7655-EP 数据表(HTML) 8 Page - Analog Devices

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AD7655-EP
Rev. A | Page 8 of 12
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
48 47 46
45
44 43 42
41 40 39 38 37
35
CNVST
34
PD
33
RESET
30
EOC
31
RD
32
CS
36
DVDD
29
BUSY
28
D15
27
D14
25
D12
26
D13
2
AVDD
3
A0
4
BYTESWAP
7
IMPULSE
6
DGND
5
A/B
1
AGND
8
SER/PAR
9
D0
10
D1
12
D3/DIVSCLK[1]
11
D2/DIVSCLK[0]
13 14
15
16
17 18 19
20 21 22
23 24
PIN 1
AD7655-EP
TOP VIEW
(Not to Scale)
NOTES
1. PADDLE CONNECTED TO GND. THIS CONNECTION IS NOT REQUIRED
TO MEET THE ELECTRICAL PERFORMANCES.
Figure 4. 48-Lead LFCSP (CP-48-1)
Table 6. Pin Function Descriptions
Pin No.
Mnemonic
Type1
Description
1, 47, 48
AGND
P
Analog Power Ground Pin.
2
AVDD
P
Input Analog Power Pin. Nominally 5 V.
3
A0
DI
Multiplexer Select. When LOW, the analog inputs INA1 and INB1 are sampled simultaneously, then
converted. When HIGH, the analog inputs INA2 and INB2 are sampled simultaneously, then converted.
4
BYTESWAP
DI
Parallel Mode Selection (8 Bit, 16 Bit). When LOW, the LSB is output on D[7:0] and the MSB is output on
D[15:8]. When HIGH, the LSB is output on D[15:8] and the MSB is output on D[7:0].
5
A/B
DI
Data Channel Selection. In parallel mode, when LOW, the data from Channel B is read. When HIGH,
the data from Channel A is read. In serial mode, when HIGH, Channel A is output first followed by
Channel B. When LOW, Channel B is output first followed by Channel A.
6, 20
DGND
P
Digital Power Ground.
7
IMPULSE
DI
Mode Selection. When HIGH, this input selects a reduced power mode. In this mode, the power
dissipation is approximately proportional to the sampling rate.
8
SER/PAR
DI
Serial/Parallel Selection Input. When LOW, the parallel port is selected; when HIGH, the serial interface
mode is selected and some bits of the DATA bus are used as a serial port.
9, 10
D[0:1]
DO
Bit 0 and Bit 1 of the Parallel Port Data Output Bus. When SER/PAR is HIGH, these outputs are in high
impedance.
11, 12
D[2:3] or
DI/O
When SER/PAR is LOW, these outputs are used as Bit 2 and Bit 3 of the Parallel Port Data Output Bus.
DIVSCLK[0:1]
When SER/PAR is HIGH, EXT/INT is LOW, and RDC/SDIN is LOW, which is the serial master read after
convert mode. These inputs, part of the serial port, are used to slow down the internal serial clock that
clocks the data output. In the other serial modes, these inputs are not used.
13
D[4]
DI/O
When SER/PAR is LOW, this output is used as Bit 4 of the Parallel Port Data Output Bus.
or EXT/INT
When SER/PAR is HIGH, this input, part of the serial port, is used as a digital select input for choosing
the internal or an external data clock called, respectively, master and slave mode. With EXT/INT tied
LOW, the internal clock is selected on SCLK output. With EXT/INT set to a logic HIGH, output data is
synchronized to an external clock signal connected to the SCLK input.
14
D[5]
DI/O
When SER/PAR is LOW, this output is used as Bit 5 of the Parallel Port Data Output Bus.
or INVSYNC
When SER/PAR is HIGH, this input, part of the serial port, is used to select the active state of the SYNC
signal in Master modes. When LOW, SYNC is active HIGH. When HIGH, SYNC is active LOW.


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