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Preliminary Technical Data
AD7745/AD7746
Rev. PrF | Page 7 of 17
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
TOP VIEW
(Not to Scale)
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
AD7745
CIN1(+)
SCL
RDY
EXCA
EXCB
CIN1(
-)
REFIN(
-)
REFIN(+)
NC
SDA
NC
VDD
GND
NC
VIN(+)
VIN(
-)
Figure 4. AD7745 Pin Configuration (16-Lead TSSOP)
TOP VIEW
(Not to Scale)
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
AD7746
CIN1(+)
SCL
RDY
EXCA
EXCB
CIN1(
-)
REFIN(
-)
REFIN(+)
CIN2(+)
SDA
NC
VDD
GND
CIN2(
-)
VIN(+)
VIN(
-)
Figure 5. AD7746 Pin Configuration (16-Lead TSSOP)
Table 6. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
SCL
Serial interface clock input. Connects to the master’s clock line.
(Requires pull-up resistor if not already provided in the system.)
2
RDY
Logic output. A falling edge on this output indicates that a conversion on enabled chan-
nel(s) has been finished and the new data are available. Alternatively, the status register
can be read via the 2-wire serial interface and the relevant bit(s) decoded to query fin-
ished conversion.
If not used, this pin should be left open circuit.
3, 4
EXCA, EXCB
CDC excitation outputs. The measured capacitance is connected between one of the EXC
pins and one of the CIN pins.
If not used, these pins should be left open circuit.
5, 6
REFIN(+), REFIN(–)
Differential voltage reference input for the voltage channel (ADC). Alternatively, the on-
chip internal reference can be used for the voltage channel. These reference input pins
are not used for conversion on capacitive channel(s) (CDC).
If not used, these pins can be left open circuit or connected to GND.
7
CIN1(-)
CDC negative capacitive input in differential mode. This pin is internally disconnected in
single ended CDC configuration.
If not used, this pin can be left open circuit or connected to GND.
8
CIN1(+)
CDC capacitive input (in single ended mode) or positive capacitive input (in differential
mode). The measured capacitance is connected between one of the EXC pins and one of
the CIN pins.
If not used, this pin can be left open circuit or connected to GND.
9
CIN2(+)
AD7746 only. CDC second capacitive input (in single ended mode) or positive capacitive
input (in differential mode).
If not used, this pin can be left open circuit or connected to GND.
10
CIN2(-)
AD7746 only. CDC negative capacitive input in differential mode. This pin is internally
disconnected in single ended CDC configuration.
If not used, this pin can be left open circuit or connected to GND.
11, 12
VIN(+), VIN(–)
Differential voltage input for the voltage channel (ADC). These pins are also used to con-
nect an external temp sensing diode.
If not used, these pins can be left open circuit or connected to GND.
13
GND
Ground pin.
14
VDD
Power supply voltage. This pin should be decoupled to GND, using a low impedance
capacitor, for example combination of 10uF tantalum and 0.1uF multilayer ceramic.
15
NC
Not connected. This pin should be left open circuit.
16
SDA
Serial interface bidirectional data. Connects to the master’s data line. Requires pull-up
resistor if not provided elsewhere in the system.
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