A-Cute
User Manual
17
September 12, 2016
3.3.3
ADC LTC2308
The SCD has an analog-to-digital converter (LTC2308) made by Linear Technology.
The LTC2308 is a low noise, 500ksps, 8-channel, 12-bit ADC with a SPI/MICROWIRE compatible
serial interface. This ADC includes an internal reference and a fully differential sample-and-hold
circuit to reduce common mode noise. The internal conversion clock allows the external serial output
data clock (SCK) to operate at any frequency up to 40MHz. The ADC provides a 4-wire SPI
compatible serial interface that is connected to a 2x20 GPIO header, as show in
It can be configured to accept eight input signals at inputs ADC_IN0 through ADC_IN7. These eight
input signals are connected to a 1x10 header, as shown in
Wherein, ADC_IN0 ~ ADC_IN6 is sensing results from the reflection-type infrared sensor, and the
other ADC_IN7 from the battery voltage divider, is a 1:4 partial pressure, the user can understand
the state of the battery through the ADC_IN7
More information about the A/D converter chip is available in its datasheet. It can be found on
manufacturer’s website
http://www.linear.com/product/LTC2308
, or in the directory \Datasheet\ADC
on the SCD System CD.