XE8000EV101 Semtech, XE8000EV101 Datasheet - Page 113

• Manufacturer Part Number: XE8000EV101
• Description: EVAL BOARD FOR XE8801AMI027LF
• Manufacturer: Semtech
• Type: MCUr

Specifications of XE8000EV101

• Contents: Fully Assembled Evaluation Board
• For Use With/related Products: XE88LC01AMI027
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

16.8.7
Figure 16-25 shows power supply rejection ratio (PSRR) at 3V and 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 2005
-10
-15
-20
15
10
-5
5
0
0
Figure 16-24 (a) Absolute and (b) relative change in quiescent curent consumption vs. RC oscillator
Table 16-28 Typical quiescent current distributions in acquisition chain (n = 16 bits, f
Power Supply Rejection Ratio
500
1000
Frequency - f
V
V
Supply
DD
DD
1500
= 5V
= 3V
2000
RC
[kHz]
2500
(a)
ADC
250
190
Figure 16-25 Power supply rejection ratio (PSRR)
3000
105
100
95
90
85
80
75
70
65
60
frequency (all PGAs active, V
PGA1
3500
165
150
VDD=3V
VDD=5V
1
PGA2
130
120
5
850
800
750
700
650
600
550
500
PGA Gain [V/V]
DD
16-28
0
.
10
PGA3
175
160
500
1000
20
Frequency - f
TOTAL
720
620
1500
DD
100
= 5V)
2000
RC
Unit
[kHz]
µA
µA
(b)
2500
XE8801A – SX8801R
3000
3500
www.semtech.com
S
= 500kHz)