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AD7709BR データシート(PDF) 8 Page - Analog Devices

部品番号 AD7709BR
部品情報  16-Bit Sigma Delta ADC with Current Sources, Switchable Reference Inputs and I/O Port
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

AD7709BR データシート(HTML) 8 Page - Analog Devices

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AD7709
–8–
REV. PrA
January 2001
PRELIMINARY TECHNICAL DATA
PIN CONFIGURATION
Pin Function Description
Pin No
Mnemonic
Function
1
IOUT1
Output for internal excitation current sources. A single current source or any
combination of the internal current sources I1,I2 and I3 can be switched to this
output.
2
IOUT2
Output for internal excitation current sources. A single current source or any
combination of the internal current sources I1,I2 and I3 can be switched to this
output.
3
REFIN1(+)
Positive reference input. REFIN(+) can lie anywhere between VDD and GND.
The nominal reference voltage (REFIN(+)-REFIN(-)) is 2.5V but the part is
functional with a reference range from 1V to VDD.
4
REFIN1(-)
Negative reference input. This reference input can lie anywhere between GND
and VDD-1V.
5
AIN1
Analog Input Channel 1. Programmable-gain analog input which can be used
as a pseudo-differential input when used with AINCOM or as the positive in-
put of a fully-differential input pair when used with AIN2. (see Communica-
tions Register section)
6
AIN2
Analog Input Channel 2. Programmable-gain analog input which can be used
as a pseudo-differential input when used with AINCOM or as the negative
input of a fully-differential input pair when used with AIN1. (see Communica-
tions Register section)
7
AIN3/P3
Analog Input Channel 3 or Digital Port Bit. Programmable-gain analog input
which can be used as a pseudo-differential input when used with AINCOM or
as the positive input of a fully-differential input pair when used with AIN4.
The second function of this bit is as a general purpose digital input bit.
8
AIN4/P4
Analog Input Channel 4 or digital port bit. Programmable-gain analog input
which can be used as a pseudo-differential input when used with AINCOM or
as the negative input of a fully-differential input pair when used with AIN3.
The second function of this bit is as a general purpose digital input bit.
9
AINCOM
All analog inputs are referenced to this input when configured in pseudo-dif-
ferential input mode.
10
REFIN2(+)
Positive reference input. REFIN2(+) can lie anywhere between VDD and GND.
The nominal reference voltage (REFIN2(+)-REFIN2(-)) is 2.5V but the part
is functional with a reference range from 1V to VDD.
TO P V IEW
(No t to S cale)
SCL K
CS
R E SET
AIN1
AINCO M
GN D
V DD
DIN
DO UT
DRDY
REFIN1(-)
REFIN1(+ )
AD7709
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
XTA L1
AIN3/P 3
AIN 2
21
22
23
24
AIN4/P 4
REFIN2(+ )
P2/S W 2
PW R G N D
P1/S W 1
XTA L2
IO UT 1
IO UT 2
REFIN2(-)


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