LTC2326-16
Production
The LTC2326-16 is a low noise, high speed 16-bit successive approximation register (SAR) ADC with pseudo-differential inputs. Operating from a single 5V...
Datasheet
LTC2326-16 on Analog.com
Dear,
My LTC2326-16 only display +/-5V when reading using arduino
I tried to read many topic but i did not find any related one.
First I connect the LTC 2326 correctly with internal reference, I have measured REFIN 2.048V and REFBUF 4.096V -> correct
Secondly, the chip is soldered correctly,
Thirdly, I use the Arduino library to communicate with LTC2326-16
//===================== int16 ==================== 15bit with 1 bit signed to read from LTC2326 ======
int16_t LTC2326_16::read()
{
int16_t val;
digitalWriteFast(_cnv, LOW); // Reset CNV for another conversion later on
SPIFIFO.write16(0);
val = SPIFIFO.read();
return val;
}
//===================== int16 ====================
NOTE that : int16_t from -32768 : 32767
By applying IN+ and IN- I have some value
(IN+ - IN-) = 2.09V :: VAL = 13406
(IN+ - IN-) = -2.09V :: VAL = -13408
(IN+ - IN-) = 5.09V :: VAL = 32574
(IN+ - IN-) = -5.09V :: VAL = -32294
(IN+ - IN-) = 6.09V :: VAL = 26542 ->> ???? WHY
(IN+ - IN-) = -6.09V :: VAL = 27650 ->> ???? WHY
-=========
According to the setup, REF internal is used, (IN+ - IN-) should have +/-10.24V range.
However, when the input voltage is higher than 5.1V, the ADC value is reduced (see 6.09V case)???
As I understand, The output data is in 2’s complement format, does it affect my reading
Sorry for my bad English,
could you please help me??
thank you so much
