Adc Differential Input Fully Differential Amplifier (Fda); Figure 2-2. Fda Driver Schematic - Texas Instruments ADS9218EVM-PDK User Manual

Analog Interface

2.2 ADC Differential Input Fully Differential Amplifier (FDA)

The THS4552 FDA is used to amplify the input signals applied to the SMA connector. The amplifier is a dual
configuration for the two different ADC channels. Each channel is configured with the same discreet feedback
components. The amplifier gain is set to 1 V/V and the bandwidth is set to 500 kHz for good performance up to
100 kHz. The ADS9218 Power Optimized Signal Chain Circuit
can help adjust component values for different optimizations.
Figure 2-2 shows a schematic of the FDA driver components.
GND
J3
1
GND J4
1
GND
6 ADS9218EVM-PDK Evaluation Module
C10
10V
0.1µF
GND
R32
DNP
49.9
1
R7
2
1.00k
C33
DNP VCM_FDA 4
25V
R10
1000pF
3
1.00k
R30
DNP
49.9
GND

Figure 2-2. FDA Driver Schematic

Copyright © 2022 Texas Instruments Incorporated
reference design covers component selection and
C9
50V
270pF
R5
1.00k
5V
U6A
THS4552IPWR
R6
15
10.0
V+
VOCM1
14
V-
R13
10.0
GND
R14
1.00k
C14
50V
270pF
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GND
C11
50V
47pF
R8
AINP_A
24.9
C12
100V
R11
470pF
AINM_A
24.9
C13
50V
47pF
GND
SBAU409 – SEPTEMBER 2022
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