ADS5547 datasheet(30/50 Pages) TI

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Example Drive Circuits

WBC1-1TLB

1:1

0.1 F

INP

INM

VCM

ADS5547

25 W

100 W

25 W

3.3pF

0.1 F

(Note A)

WBC1-1TLB

100 W

33 W

Z andTFADC

-6

-5

-1

f − Frequency − MHz

1000

-4

100

200

500

700

-2

-3

400

300

600

800

900

ADS5547

SLWS192 – NOVEMBER 2006

APPLICATION INFORMATION (continued)

In addition to the above ADC requirements, the drive circuit may have to be designed to provide a low insertion

loss over the desired frequency range and matched impedance to the source. For this, the ADC input

impedance has to be taken into account (Figure 40).

A suitable configuration using RF transformers and including the R-C-R filter is shown in Figure 38. Note the

15-

Ω series resistors and the low common-mode impedance (using 33-Ω resistors terminated to VCM).

Use lower series resistance (

≈ 5 Ω to 10 Ω) at high input frequencies (> 100 MHz)

Figure 38. Example Drive Circuit With RF Transformers

Figure 39. Analog Input Bandwidth, TFADC (Actual Silicon Data)

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