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AS7000 датащи(PDF) 46 Page - ams AG

номер детали AS7000
подробное описание детали  The AS7000 device provides a flexible analog front end for light sensing applications
PDF  92 Pages
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производитель  AMSCO [ams AG]
домашняя страница  http://www.ams.com
Logo AMSCO - ams AG

AS7000 датащи(HTML) 46 Page - ams AG

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Page 46
ams Datasheet
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[v1-12] 2018-Feb-26
AS7000 − Detailed Description
Electrical Analog Front End
The electrical analog front end consists of three identical signal
paths with independent settings of bias condition, gain and
offset.
Figure 56:
Electrical Analog Front End Internal Circuit
Note(s):
1. Resistor / T-gates resistance values are given as indication – do not rely on absolute values
Input Pins
Five general purpose pins can be used either as configurable
GPIO for the processor or as analog input pins for the electrical
analog front end. The analog inputs can be configured to setup
different amplifier topologies.
GPIO0
GPIO1
GPIO6
GPIO5
GPIO4
VDD
00b … off
01b … 10µ A
10b … 100µA
11b … 1mA
gpio_bias_current
gpio_i_bias
gpio_dac
gpio_r_bias
160kΩ
gpio_gst_in
measure_dac
T-gates:
50kΩ
T-gates:
250Ω
50kΩ
T-gates:
10kΩ
gst_gain
0 … 1x
1 … 2x
2 … 4x
3 … 8x
4 … 16x
5 … 32x
6 … 64x
7 … don’t use
3
2
1
0
AGND
gst_ref
SIGREF
don’t
use
128kΩ
gpio_gst_in
measure_dac
on
ADC
Vref=1.6V
AGND
adc_sel=2
dac_value
sigref_on_dac_buf
0
1
SIGREF
opamp & DAC enabled
automatically
1.9V
DAC



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