sx8724s Semtech Corporation, sx8724s Datasheet - Page 61

• Manufacturer Part Number: sx8724s
• Description: Zoomingadc For Sensing Data Acquisition
• Manufacturer: Semtech Corporation

Revision 1.0
© Semtech
11.6 Power Consumption
As mentioned in
variation of current consumption with supply voltage V
the ADC (see
4.2V.
As shown in
bias currents of the PGAs and the ADC with registers IbAmpPga and IbAmpAdc. (In
'00' for fs = 500, 250, 62.5 kHz respectively. In this case the Charge Pump is forced ON for V
for V
ADVANCED COMMUNICATIONS & SENSING
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> 4.2V.
Figure
Table 39, page
section 6.4, page 16
Figure 58. Current Consumption vs. Temperature and ADC Sampling Frequency
58, if lower sampling frequency is used, the current consumption can be lowered by reducing the
February 2011
62). In this case the Charge Pump is forced ON for V
Figure 57. Current Consumption vs. Supply Voltage and PGAs
1'100
1'000
1'100
1'000
900
800
700
600
500
400
300
200
900
800
700
600
500
400
300
200
2.0
2
the Charge Pump must be enabled if V
ADC
ADC+PGA1
ADC+PGA12
ADC+PGA123
62.5Khz, Ibias = 0.25
125Khz, Ibias = 0.25
250Khz, Ibias = 0.5
500Khz, Ibias = 1
2.5
2.5
3.0
3
Page 61
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3.5
3.5
V
V
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, as well as the distribution between the 3 PGA stages and
[V]
[V]
4
4.0
ZoomingADC for sensing data acquisition
4.5
4.5
5
5.0
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5.5
Figure
is below 3V.
5.5
< 4.2V and forced OFF for V
58, IbAmpPga/Adc = '11' , '10' ,
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Figure 57
< 4.2V and forced OFF
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plots the
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>