Datasheet

AD7194 Data Sheet
Rev. A | Page 10 of 56
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
08566-005
NOTES
1. NC = NO CONNECT.
2. CONNECT EXPOSED PAD TO AGND.
24 DV
DD
23
AV
DD
22
DGND
21
AGND
20
AIN16
19
AIN15
18
REFIN1(–)
17 REFIN1(+)
1
2
3
4
5
6
7
8
AIN1/P3
AIN2/P2
AIN3/P1/REFIN2(+)
AIN4/P0/REFIN2(–)
AINCOM
AGND
AIN5
AIN6
9
10
11
12 13 14 15 16
AIN7 AIN8 AIN9
AIN10
AIN11
AIN12 AIN13 AIN14
32 31 30 29 28 27 26 25
CS SCLK MCLK2 MCLK1 DIN DOUT/RD
Y
NC SYNC
TOP VIEW
(Not to Scale)
AD7194
Figure 5. Pin Configuration
Table 5. Pin Function Descriptions
Pin No. Mnemonic Description
1 AIN1/P3
Analog Input/Digital Output Pin. This pin can function as an analog input pin. When the GP32EN bit is set
to 1, the pin functions as a general-purpose output bit referenced between AV
DD
and AGND.
2 AIN2/P2
Analog Input/Digital Output Pin. This pin can function as an analog input pin. When the GP32EN bit is set
to 1, the pin functions as a general-purpose output bit referenced between AV
DD
and AGND.
3 AIN3/P1/REFIN2(+)
Analog Input/Digital Output Pin/Positive Reference Input. This pin functions as an analog input pin. When
the GP10EN bit is set to 1, the pin functions as a general-purpose output bit referenced between AV
DD
and
AGND. When the REFSEL bit in the configuration register is set to 1, this pin functions as REFIN2(+). An
external reference can be applied between REFIN2(+) and REFIN2(−). REFIN2(+) can lie anywhere between
AV
DD
and AGND + 1 V.
4 AIN4/P0/REFIN2(−)
Analog Input/Digital Output Pin/Positive Reference Input. This pin functions as an analog input pin. When
the GP10EN bit is set to 1, the pin functions as a general-purpose output bit referenced between AV
DD
and
AGND. When the REFSEL bit in the configuration register is set to 1, this pin functions as REFIN2(−). An
external reference can be applied between REFIN2(+) and REFIN2(−). This reference input can lie anywhere
between AGND and AV
DD
− 1 V.
5 AINCOM Analog Input AIN1 to Analog Input AIN16 are referenced to this input when the bit pseudo is set to 1.
6 AGND Analog Ground Reference Point.
7 AIN5 Analog Input Pin.
8 AIN6 Analog Input Pin.
9 AIN7 Analog Input Pin.
10 AIN8 Analog Input Pin.
11 AIN9 Analog Input Pin.
12 AIN10 Analog Input Pin.
13 AIN11 Analog Input Pin.
14 AIN12 Analog Input Pin.
15 AIN13 Analog Input Pin.
16 AIN14 Analog Input Pin.
17 REFIN1(+)
Positive Reference Input. An external reference can be applied between REFIN1(+) and REFIN1(−).
REFIN1(+) can lie anywhere between AV
DD
and AGND + 1 V. The nominal reference voltage, (REFIN1(+) −
REFIN1(−)), is AV
DD
, but the part functions with a reference from 1 V to AV
DD
.
18 REFIN1(−) Negative Reference Input. This reference input can lie anywhere between AGND and AV
DD
− 1 V.
19 AIN15 Analog Input Pin.
20 AIN16 Analog Input Pin.
21 AGND Analog Ground Reference Point.
22 DGND Digital Ground Reference Point.