TIDA-01022 reference design primarily focuses on a multichannel high-speed analog front-end, which is typically used in end equipment like a digital storage oscilloscope (DSO), wireless communication test equipment (WCTE), and radars. A 50 Ω input data acquisition (DAQ) signal chain like that of TIDA-01022 can be converted into a high-input impedance DAQ system by inserting the BUF802 at the front.

TIDA-01022 orginally features the following:

• LMH5401 is a high-performance, differential amplifier with an usable bandwidth from DC to 2 GHz. It is used as single to differential conversion amplifier in this signal chain. The device offers excellent linearity performance at a fixed 12-dB gain.
• LMH6401 is a wideband digitally controlled variable gain, differential in and differential out, amplifier. The noise and distortion performance are optimized to drive ultra-wideband ADCs. The device offers DC to 4.5-GHz bandwidth with a gain range from –6 dB to 26 dB in 1-dB steps. The gain can be controlled using a standard serial peripheral interface (SPI).
• The ADC12DJ5200RF device is a 12 bit, giga-sample, analog-to-digital converter (ADC) that can directly sample input frequencies from DC to above 10 GHz. ADC12DJ5200RF can be configured as a dual-channel, 5.2 GSPS ADC or single-channel, 10.4 GSPS ADC.

The BUF802 along with offering high-input impedance and low-noise for the front-end amplifier, holds capability of driving matched loads of 50 Ω, making it easy to retrofit with predesigned analog front-end signal chains. Figure 9-7 to Figure 9-9 shows the comparison of native performance of the TI design TIDA-01022 and performance achieved post addition of BUF802 at the front-end. Adding BUF802 at the input of TIDA-01022 translates the original 50 Ω input imepdance TI design to a high-input impedance DAQ signal chain. A simplified schematic of BUF802 + TIDA-01022 is shown in Figure 9-6.