XE88LC05MI000 ETC1 [List of Unclassifed Manufacturers], XE88LC05MI000 Datasheet - Page 33

• Manufacturer Part Number: XE88LC05MI000
• Description: 16 + 10 bit Data Acquisition Ultra Low-Power Microcontroller
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

9 Digital to analog converters (DACs)
9.1 Bias DAC
9.2 The DAC of bias DAC
Table 9.1:
Note:
9.3 The amplifier of bias DAC
Table 9.2:
Figure 9.1:
33
The XE88LC05 includes 2 DACs: a signal DAC and a bias DAC.
The bias DAC is a low resolution (8 bits) DAC with a buffer perfectly adapted to sensor bridge
bias. It can be used to bias a bridge in current (figure) or in voltage by choosing the pins con-
nection.
The bias DAC itself is built of a series of resistors which two extremes are available outside
the chip, so that one can connect it to an external source when the output of the DAC should
not be ratiometric to the power supply.
The DAC convertor is a resistive divider connected between pads DAB_R_m and DAB_R_p.
DAC performances
1) Time to reach the final value within 5%. Node not charged.
2) In most cases DAB_R_m will be connected to VSS and DAB_R_p to VDD.
3) For DAB_R_m connected to VSS and DAB_R_p to VDD, VDD > 2.4 V.
The amplifier can be used in several configurations as for biasing a bridge in voltage or current.
Application examples are given in application note AN8000.03.
Amplifier performances
General block diagram of the bias DAC
GBW
sym
gain
range
sym
tstep
DNL
wda
INL
differential non-linearity
gain bandwidth product
integral non-linearity
number of input bits
DAC output range
step response
description
description
gain at DC
Data Acquisition Microcontroller
DAB_R_m
min
min
100
60
typ
typ
8
max
DAB_R_p
max
100
1
1
unit
dB
Hz
unit
LSB
LSB
bits
ms
Comments
XE88LC05
1
1
Comments
1
2
3
3
D0109-40