xe88lc05 ETC-unknow, xe88lc05 Datasheet - Page 31

• Manufacturer Part Number: xe88lc05
• Description: 16 10 Bit Data Acquisition Ultra Low-power Microcontroller
• Manufacturer: ETC-unknow

8.13 Power Supply Rejection Ratio
Table 8.9:
8.14 Frequency Response
Figure 8.21:
Figure 8.22:
31
850
800
750
700
650
600
550
500
0
500
1000
Figure below 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
PSRR (n = 16 bits, V
The incremental ADC of the XE88LC05 is an over-sampled converter with two main blocks:
an analog modulator and a low-pass digital filter. The main function of the digital filter is to re-
move the quantization noise introduced by the modulator. As shown below, this filter deter-
mines the frequency response of the transfer function between the output of the ADC and the
analog input V
Absolute and (b) relative change in quiescent current consumption vs. clock speed
Power supply rejection ratio (PSRR)
Frequency - f
DD
V
V
Supply
DD
DD
.
1500
= 5V
= 3V
2000
RC
[kHz]
IN
105
100
2500
GAIN = 1
95
90
85
80
75
70
65
60
. Notice that the frequency axes are normalized to one elementary conversion
79
72
IN
3000
VDD=3V
VDD=5V
1
Data Acquisition Microcontroller
= V
3500
REF
GAIN =5
5
= 2.5V, f
78
79
PGA Gain [V/V]
10
S
= 500kHz)
GAIN = 10
100
90
20
-10
-15
-20
15
10
-5
5
0
0
100
500
GAIN = 20
99
90
1000
Frequency - f
1500
GAIN =100
2000
RC
XE88LC05
97
86
[kHz]
2500
3000
Unit
dB
dB
D0109-40
3500