AD9689-2000EBZ datasheet(29/134 Pages) AD

29 / 134 page

Data Sheet

AD9689

Rev. A | Page 29 of 134

Differential Input Configurations

There are several ways to drive the AD9689, either actively or

passively. Optimum performance is achieved by driving the

analog input differentially.

For applications where SNR and SFDR are key parameters,

differential transformer coupling is the recommended input

configuration (see Figure 79 and Table 9) because the noise

performance of most amplifiers is not adequate to achieve the

true performance of the AD9689.

For low to midrange frequencies, a double balun or double

transformer network (see Figure 79 and Table 9) is recommended

for optimum performance of the AD9689.

For higher frequencies in the second or third Nyquist zones, it

is recommended to remove some of the front-end passive

components to ensure wideband operation (see Figure 80 and

Table 9).

ADC

200Ω

NOTES:

1. SEE TABLE 9 FOR COMPONENT VALUES

MARKI

BAL-0006

Figure 79. Differential Transformer Coupled Configuration for the AD9689

ADC

MARKI

BAL-0009

25Ω

0.1µF

200Ω

10Ω

25Ω

10Ω

Figure 80. Input Network Configuration for Frequencies > 5 GHz

Table 9. Differential Transformer Coupled Input Configuration Component Values

Frequency Range

Transformer

<5000 MHz

BAL-0006

25 Ω

10 Ω

0.1 μF

0.4 pF

0.4 pF or open

>5000 MHz

BAL-0009

25 Ω

10 Ω

0.1 μF

Open

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