xe88lc01 ETC-unknow, xe88lc01 Datasheet - Page 29

• Manufacturer Part Number: xe88lc01
• Description: Sensing Machine 16 10 Bit Data Acquisition Ultra Low-power Microcontroller
• Manufacturer: ETC-unknow

Typical output noise of ZoomingADC preamplifiers
8.11 Gain Error and Offset Error
29
Figure 8.17:
Amplifier
PGA1
PGA2
PGA3
Symbol
V
V
V
n,out1
n,out2
n,out3
Where V
As one can see on the figures above, increase the gain of the first amplifier lowers the output
noise for constant global gain. It also lowers sensitivity to temperature drift as offset is better
compensated on first amplifier.
Gain error is defined as the amount of deviation between the ideal transfer function and the
measured transfer function (with the offset error removed). The left figure shows gain error vs.
temperature for different PGA gains. The curves are expressed in % of Full-Scale Range
(FSR) normalized to 25°C.
Noise measured at the output of the ZoomingADC
Typical output noise per
n,outx
ADC only
over-sample
PGA1: 10
PGA2: 10
PGA3: off
PGA1: 1
PGA2: 10
PGA3: off
is the rms output noise of amplifier x.
205
340
365
uVrms
uVrms
uVrms
Unit
Data Sheet XE88LC01
Data Acquisition Microcontroller
PGA1: 1
PGA2: 10
PGA3: 10
PGA1: off
PGA2: 1
PGA3: 10
D0202-60