SBASB99 November 2025 AMC1200C
PRODUCTION DATA
Many systems use ADCs with single-ended inputs that cannot connect directly to the differential output of the AMC1200C. Figure 7-3 shows a circuit for converting the differential output signal into a single-ended signal in front of the ADC. For R1 = R3 and R2 = R4, the output voltage equals (R2 / R1) × (VOUTP – VOUTN) + VREF. For C1 = C2 the bandwidth of the filter becomes 1 / (2 × π × C1 × R1). Configure the bandwidth of the filter to match the bandwidth requirement of the system. For best linearity, use capacitors with low voltage coefficients (such as NP0-type capacitors). For most applications, R1 = R2 = R3 = R4 = 3.3kΩ and C1 = C2 = 330pF yield good performance.
The following reference guides provide further information on the general procedure to design the filtering and driving stages of SAR ADCs. These reference guides are available for download at www.ti.com.