Please refer to some of the PCB design guidelines mentioned at the link 

Capacitance Sensors for Human Interfaces to Electronic Equipment | Analog Devices

AN-854 Sensor PCB Design Guidelines for the AD7142 and AD7143 Capacitance-to-Digital Converters Application…

Please refer to the following notes 

AN-854 Sensor PCB Design Guidelines for the AD7142 and AD7143 Capacitance-to-Digital Converters Application Note (Rev. A) (analog.com)

AN-925 (analog.com)

AN-957 Layout Guidelines for the AD7147 and AD7148 CapTouch…

Hi Allan,

Sorry for the delay in getting back to you.  If you need multiple sensor inputs then have you considered maybe the AD7142 or AD7143 parts?  These parts have multiple sensor inputs so they would reduce the need to use multiple AD7746 chips.

Hello Idowu,

The AD7746 cannot be used for single electrode sensing; shorting the Excitation pins to the CIN pins will saturate the readings of the sensor.

The AD7747 is the only single ended device in this family, but you could look at the CapTouch…

Hi,

Basically I want to oscillate my sensors so they only detect objects on only one of their sides, not both. Something as what is shown in this pdf in section 2.1 http://www.ti.com/lit/an/snoa926a/snoa926a.pdf

When I say "other capacitive converters…

Hi

there are couple of parts that provide more number of channels but they are limited to applications such as single electrode capacitance sensors or have touch sensor type of applications.

http://www.analog.com/en/products/analog-to-digital-converters…