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AD7621ASTZ1 데이터시트(PDF) 8 Page - Analog Devices

부품명 AD7621ASTZ1
상세설명  16-Bit, 2 LSB INL, 3 MSPS PulSAR짰 ADC
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AD7621
Rev. 0 | Page 8 of 32
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
36
35
34
33
32
31
30
29
28
27
26
25
13 14 15 16 17 18 19 20 21 22 23 24
1
2
3
4
5
6
7
8
9
10
11
12
48 47 46 45 44
39 38 37
43 42 41 40
PIN 1
IDENTIFIER
TOP VIEW
(Not to Scale)
AGND
CNVST
PD
RESET
CS
RD
DGND
AGND
AVDD
NC
BYTESWAP
OB/2C
NC = NO CONNECT
SER/PAR
D0
D1
D2/DIVSCLK[0]
BUSY
D15
D14
D13
AD7621
D3/DIVSCLK[1]
D12
IMPULSE
WARP
Figure 4. Pin Configuration
Table 6. Pin Function Descriptions
Pin No.
Mnemonic
Type1
Description
1, 41, 42
AGND
P
Analog Power Ground Pin.
2, 44
AVDD
P
Input Analog Power Pins. Nominally 2.5 V.
3, 40
NC
No Connect.
4
BYTESWAP
DI
Parallel Mode Selection (8-Bit/16-Bit). When high, the LSB is output on D[15:8] and the MSB is output
on D[7:0]; when low, the LSB is output on D[7:0] and the MSB is output on D[15:8].
5
OB/2C
DI
Straight Binary/Binary Twos Complement Output. When high, the digital output is straight binary;
when low, the MSB is inverted resulting in a twos complement output from its internal shift register.
6
WARP
DI
Conversion Mode Selection. When WARP = high and IMPULSE = high, this selects wideband mode
with slightly improved linearity and THD. When WARP = high and IMPULSE = low, this selects warp
mode. In either mode, these are the fastest modes; maximum throughput is achievable, and a
minimum conversion rate must be applied in order to guarantee full specified accuracy.
When WARP = low and IMPULSE = low, this input selects normal mode where full accuracy is
maintained independent of the minimum conversion rate.
7
IMPULSE
DI
Conversion Mode Selection. When IMPULSE = high and WARP = low, this input selects impulse mode,
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 high, the serial interface is selected and some bits of the data bus
are used as a serial port; the remaining data bits are high impedance outputs. When SER/PAR = low,
the parallel port is selected.
9, 10
D[0:1]
DO
Bit 0 and Bit 1 of the Parallel Port Data Output Bus.
11, 12
D[2:3]
DI/O
When SER/PAR = low, these outputs are used as Bit 2 and Bit 3 of the parallel port data output bus.
or
DIVSCLK[0:1]
When SER/PAR = high, serial clock division selection. When using serial master read after convert
mode (EXT/INT = low, RDC/SDIN = low) these inputs can be used to slow down the internally
generated serial clock that clocks the data output. In other serial modes, these pins are high
impedance outputs.
13
D4
DI/O
When SER/PAR = low, this output is used as Bit 4 of the parallel port data output bus.
or EXT/INT
When SER/PAR = high, serial clock source select. This input is used to select the internally generated
(master ) or external (slave) serial data clock.
When EXT/INT = low: master mode. The internal serial clock is selected on SCLK output.
When EXT/INT = high: slave mode. The output data is synchronized to an external clock signal, gated
by CS, connected to the SCLK input.


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