XE8000EV110 Semtech, XE8000EV110 Datasheet - Page 139

• Manufacturer Part Number: XE8000EV110
• Description: EVAL BOARD FOR XE8802AMI035LF
• Manufacturer: Semtech
• Type: MCUr

Specifications of XE8000EV110

• Contents: Fully Assembled Evaluation Board
• For Use With/related Products: XE88LC02MI035
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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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