AD9059

–8–

REV. 0

Power Dissipation

The power dissipation of the AD9059 is specified to reflect a

typical application setup under the following conditions: en-

typical (10 pF maximum). The actual dissipation will vary as

these conditions are modified in user applications. Figure 8

shows typical power consumption for the AD9059 versus ADC

28

1

3

1k

Ω

1k

Ω

AINA

AINB

AD9059

0.1µF

0.1µF

0.1µF

+5V

(1V p-p)

(OPTIONAL)

(1V p-p)

Figure 14. Capacitively Coupled AD9059

A power-down function allows users to reduce power dissipa-

tion when ADC data is not required. A TTL/CMOS HIGH

signal (PWRDN) shuts down portions of the dual ADC and

brings total power dissipation to less than 10 mW. The internal

bandgap voltage reference remains active during power-down

mode to minimize ADC reactivation time. If the power-down

function is not desired, Pin 3 should be tied to ground. Both

ADC channels are controlled simultaneously by the PWRDN

pin; they cannot be shut down or turned on independently.

Applications

The wide analog bandwidth of the AD9059 makes it attractive

for a variety of high performance receiver and encoder applica-

tions. Figure 16 shows the dual ADC in a typical low cost I & Q

demodulator implementation for cable, satellite, or wireless

LAN modem receivers. The excellent dynamic performance of

the ADC at higher analog input frequencies and encode rates

empowers users to employ direct IF sampling techniques (refer

to Figure 3, Spectral Plot). IF sampling eliminates or simplifies

analog mixer and filter stages to reduce total system cost and

power.

28

1

10k

Ω

1k

Ω

AINA

AINB

AD9059

0.1µF

+5V

(–0.5V TO +0.5V)

10k

Ω

+5V

+5V

AD8041

AD8041

1k

Ω

1k

Ω

1k

Ω

3

Figure 15. DC Coupled AD9059 (VIN Inverted)

AD9059

BPF

BPF

90

°

VCO

IF IN

VCO

ADC

ADC

Figure 16. I and Q Digital Receiver

The high sampling rate and analog bandwidth of the AD9059

are ideal for computer RGB video digitizer applications. With a

full-power analog bandwidth of 2

× the maximum sampling rate,

the ADC provides sufficient pixel-to-pixel transient settling

time to ensure accurate 60 MSPS video digitization. Figure 17

shows a typical RGB video digitizer implementation for the

AD9059.

8

RED

GREEN

AD9059

BLUE

AD9059

H-SYNC

PLL

PIXEL CLOCK

8

8

ADC

ADC

ADC

ADC

Figure 17. RGB Video Encoder