ADA4806-1ARJZ-R2 datasheet(22/24 Pages) AD

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ADA4806-1

Data Sheet

SAMPLING PERIOD,

ACQUISITION

POWERED

IQ, ON

tAMP, OFF

tAMP, ON

ADC

CNV

ADA4806-1

SHUTDOWN/

SLEEP

SHUTDOWN/SLEEP

CONVERSION

ADA4806-1

QUIESCENT

CURRENT

Figure 63. Timing Waveforms

Figure 64 shows the quiescent power of the ADA4806-1,

operating from a single +6 V supply, without power scaling and

while power scaling via the SHUTDOWN pin and the SLEEP pin.

Without power scaling, the ADA4806-1 consumes constant

power regardless of the sampling frequency, as shown in

Equation 1.

PQ = IQ × VS

(1)

With power scaling, the quiescent power becomes proportional

to the ratio between the amplifier on time, tAMP, ON, and the

sampling time, tS:













−













AMP

off

AMP

(2)

Thus, by dynamically switching the ADA4806-1 between

shutdown/sleep and full power modes between consecutive

samples, the quiescent power of the driver scales with the

sampling rate.

Note that tAMP,ON in Figure 64 is 3 µs for the SHUTDOWN pin and

0.5 µs for the SLEEP pin.

ADC SAMPLE RATE (ksps)

0.01

0.1

1.0

0.1

100

1000

CONTINUOUSLY ON

SLEEP MODE

SHUTDOWN MODE

AD7980 ADC

Figure 64. Quiescent Power Consumption of the ADA4806-1 vs.

ADC Sample Rate, Using Dynamic Power Scaling

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