The ADC168M102R-SEP accepts differential, and pseudo-differential inputs (referenced to CMx pins). Figure 2-2 shows the input range of the ADC168M102R-SEP in differential mode.

Figure 2-2 Analog Input Range (Differential)

Due to the EVM implementation, the recommendation is to operate at a sampling rate of 200ksps or less for best performance.

Figure 2-3 shows one differential channel of the circuit for the signal conditioning circuit that features the OPA4H014-SEP op-amp. Inputs connect to header J2 for channel A, and header J1 for channel B. The CMx_EXT pins (J1[9] and J2[9]) can be used to provide external inputs to the CMA and CMB pins of the ADC168M102R-SEP. Jumpers JP1 and JP2 should be in the "CMx_EXT" position, where "x" is the respective channel, to route the CMx_EXT inputs from header J1 and J2 to the ADC.

The differential filter capacitors (C9, C10, C11, and C14) are optional, and are unpopulated by default.

Figure 2-3 OPA4H014-SEP Circuit