AD4114 datasheet(20/49 Pages) AD

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AD4114

Data Sheet

Rev. 0 | Page 20 of 49

CIRCUIT DESCRIPTION

MULIPLEXER

The device has 17 voltage input pins, VIN0 to VIN15 and

VINCOM. Each pin connects to the internal multiplexer. The

multiplexer enables these inputs to be configured as input pairs.

The AD4114 can have up to 16 active channels. When more

than one channel is enabled, the channels are automatically

sequenced in order from the lowest enabled channel number to

the highest enabled channel number. The multiplexer output

connects to the input of the integrated, true rail-to-rail buffers.

These buffers can be bypassed and the multiplexer output can

be directly connected to the ADC switched capacitor input. The

simplified input circuits are shown in Figure 26.

VOLTAGE INPUTS

The AD4114 can be set up to have either 16 single-ended inputs

or eight fully differential inputs. The voltage divider on the AFE

has a division ratio of 10 and consists of precision matched

resistors that enable an input range of ±20 V from a single 5 V

power supply.

Enable the input buffers in the corresponding setup configuration

Fully Differential Inputs

The differential inputs are paired together in the following pairs:

VIN0 and VIN1, VIN2 and VIN3, VIN4 and VIN5, VIN6 and

VIN7, VIN8 and VIN9, VIN10 and VIN11, VIN12 and VIN13,

and VIN14 and VIN15.

Single-Ended Inputs

The user can measure up to 16 different single-ended voltage

inputs. In this case, each voltage input must be paired with the

VINCOM pin. Connect the VINCOM pin externally to the

AVSS pin.

AVSS

VIN0

AVDD

VINCOM

AVDD

VIN1

AVDD

AVSS

AVDD

VBIAS–

–

MULTIPLEXER

222kΩ

222kΩ 222kΩ

222kΩ

1MΩ

Figure 26. Simplified Voltage Input Circuits

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