ADL5580BCCZ-R7 datasheet(17/22 Pages) AD

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Data Sheet

ADL5580

Rev. 0 | Page 17 of 22

INPUT AND OUTPUT INTERFACING

Differential Input to Differential Output

The ADL5580 can be configured as a differential input to

differential output driver (see Figure 33). The 50 Ω resistors,

R1 and R2, combined with the 100 Ω input impedance provide

a 50 Ω input match with the 1:1 balun. The input and output

0.1 µF capacitors isolate the common-mode bias voltage (VBIAS)

on input and output pins from the source and balanced load.

The load is 50 Ω to provide the expected ac performance.

+ 5V

0.1µF

1:1BALUN

50Ω

ADL5580

½ RL

0.1µF

–

–1.8V

Figure 33. Differential Input to Differential Output Configuration

The differential gain of the ADL5580 is dependent on the source

impedance and load, as shown in Figure 34.

–

ADL5580

0.1µF

½ RS

0.1µF

Figure 34. Differential Input Loading Circuit

Single-Ended Input to Differential Output

The ADL5580 can also be configured in a single-ended input to

differential output configuration. In this configuration, the gain

of the device is reduced due to the application of the signal to

only one side of the amplifier. The input and output 0.1 µF

capacitors isolate the VCM on input and output pins from the

source and balanced load.

0.1µF

50Ω

ADL5580

½ RL

0.1µF

–

Figure 35. Single-Ended Input to Differential Output Configuration

The ADL5580 is a high output linearity, fixed gain dc-coupled

amplifier for multigigasample ADC interfacing. The open-loop

architecture anticipates a 50 Ω differential dc output load. The

maximum linear output swing is optimized for 1.4 V p-p

differential.

LAYOUT

Solder the four exposed power supply pads on the underside of

the ADL5580 to a low thermal and electrical impedance power

plane. These pads are typically soldered to exposed opens in the

solder mask on the evaluation board. Notice the use of 4 via holes

on each exposed power pad of the ADL5580-EVALZ. Connect

these power vias to power layers on the evaluation board to

maximize heat dissipation from the device package. For more

information on the evaluation board, see the ADL5580-EVALZ

product page.

Ensure that the decoupling capacitors are located close to the

supply voltage pins.

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