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ADA4805-2ARMZ-R7 Folha de dados(PDF) 22 Page - Analog Devices

Nome de Peças ADA4805-2ARMZ-R7
Descrição Electrónicos  0.2 關V/째C Offset Drift, 105 MHz Low Power, Low Noise, Rail-to-Rail Amplifiers
PDF  25 Pages
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

ADA4805-2ARMZ-R7 Folha de dados(HTML) 22 Page - Analog Devices

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ADA4805-1/ADA4805-2
Data Sheet
Rev. B | Page 22 of 25
SAMPLING FREQUENCY = 100kHz
tS = 10µs
ACQUISITION
ACQUISITION
ACQUISITION
SHUTDOWN
3µs
3µs
POWERED
ON
POWERED
ON
POWERED
ON
SHUTDOWN
SHUTDOWN
Vf1
tf1
tTURNOFF1
tf2
Vf2
tTURNOFF2
tAMP, ON
Vf3
tf3
tTURNOFF3
ADC
MODE
CNV
ADA4805-1/
ADA4805-2
SHUTDOWN
CONVERSION
CONVERSION
CONVERSION
MINIMUM
POWERED ON TIME = 3µs
ADA4805-1/
ADA4805-2
OUTPUT
Figure 62. Timing Waveforms
Figure 63 shows the quiescent power of the ADA4805-1/
ADA4805-2 with and without the power scaling. Without power
scaling, the ADA4805-1/ADA4805-2 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:
S
ON
AMP
S
Q
Q
t
t
V
I
P
,
(2)
Thus, by dynamically switching the ADA4805-1/ADA4805-2
between shutdown and full power modes between consecutive
samples, the quiescent power of the driver scales with the
sampling rate.
10
100
1000
10000
100000
10
100
1k
10k
100k
1M
ADC SAMPLING FREQUENCY (Hz/s)
ADA4805-1/ADA4805-2, 6V SINGLE SUPP LY
VIN = 4.72V p-p (–0.5dBFS)
fIN = 100Hz
ON TIME = 3µs
ADA4805-1/ADA4805-2
ON TIME = 3µs
AD7980 (ADC)
ADA4805-1/ADA4805-2
CONTINUOUSLY ON
Figure 63. Quiescent Power Consumption of the ADA4805-1/ADA4805-2 vs.
ADC Sampling Frequency



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