xe8802 Semtech Corporation, xe8802 Datasheet - Page 139
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xe8802
Manufacturer Part Number
xe8802
Description
Data Acquisition Soc With 16+10 Bit Zoomingadc? Embedded Risc Controller And Lcd Driver
Manufacturer
Semtech Corporation
Datasheet
1.XE8802.pdf
(193 pages)
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17.8.7
Figure 17-25 shows power supply rejection ratio (PSRR) at a 3V and a 5V supply voltage, and for various PGA
gains. PSRR is defined as the ratio (in dB) of voltage supply change (in V) to the change in the converter output (in
V). PSRR depends on both PGA gain and supply voltage V
© Semtech 2006
-10
-15
-20
15
10
-5
5
0
Figure 17-24. (a) Absolute and (b) relative change in quiescent curent consumption vs. RC oscillator
0
Power Supply Rejection Ratio
500
V
V
Supply
DD
DD
1000
= 5V
= 3V
Frequency - f
V
V
Supply
DD
DD
1500
Table 17-28. Typical quiescent current distributions in acquisition chain
= 5V
= 3V
GAIN = 1
2000
RC
Table 17-29. PSRR (n = 16 bits, V
79
72
[kHz]
(a)
2500
ADC
250
190
Figure 17-25. Power supply rejection ratio (PSRR)
3000
GAIN =5
105
100
95
90
85
80
75
70
65
60
78
79
frequency (all PGAs active, V
PGA1
3500
165
150
XE8802 Sensing Machine Data Acquisition MCU
VDD=3V
VDD=5V
1
(n = 16 bits, f
GAIN = 10
PGA2
100
130
120
5
90
850
800
750
700
650
600
550
500
PGA Gain [V/V]
17-27
0
10
DD
PGA3
with ZoomingADC™ and LCD driver
.
GAIN = 20
175
160
S
500
= 500kHz)
IN
99
90
= V
20
1000
REF
Frequency - f
TOTAL
720
620
1500
DD
= 2.5V, f
GAIN =100
100
= 5V)
97
86
2000
RC
Unit
[kHz]
µA
µA
(b)
S
= 500kHz)
2500
Unit
dB
dB
3000
3500
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