SX8724C Datasheet, PDF (59/67 Pages) Semtech Corporation – ZoomingADC for sensing data acquisition

SX8724C
ZoomingADC for sensing data acquisition
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
As shown in Figure 52, if lower sampling frequency is used, the current consumption can be lowered by reducing the
bias currents of the PGAs and the ADC with registers IbAmpPga and IbAmpAdc. (In Figure 52, IbAmpPga/Adc = '11', '10',
'00' for fs = 500, 250, 62.5 kHz respectively. The Charge Pump is forced ON for VBATT < 4.2V and forced OFF for VBATT >
4.2V.
1'100
1'000
900
800
62.5Khz, Ibias = 0.25
125Khz, Ibias = 0.25
250Khz, Ibias = 0.5
500Khz, Ibias = 1
700
600
500
400
300
200
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VBATT [V]
Figure 52. Current Consumption vs Temperature and ADC Sampling Frequency
Revision 1.01
© Semtech
January 2011
Page 59
www.semtech.com/products/