Linduino  1.3.0
Linear Technology Arduino-Compatible Demonstration Board

LTC2642: 16-/14-/12-Bit VOUT DAC with SPI Interface LTC2641: 16-/14-/12-Bit VOUT DAC with SPI Interface. More...

Detailed Description

LTC2642: 16-/14-/12-Bit VOUT DAC with SPI Interface LTC2641: 16-/14-/12-Bit VOUT DAC with SPI Interface.

The LTC2641/LTC2642 are families of 16-,14 and 12-bit unbuffered voltage output
DACs. These DACs operate from 2.7V to 5.5V supply and are monotonic over
temperature.

They communicate via SPI interface. 16 bits of data are loaded through DIN
after a high-to-low transition of CS (MSB first). After 16 data bits have
been loaded into the serial input register, a low-to-high transition on CS
transfers the data to the 16-bit DAC latch, updating the DAC output.

For the 14-bit DACs, (LTC2641-14/LTC2642-14), the MSB remains in the same
(left-justified) position in the input 16-bit data word. Therefore, two
“don’t-care” bits must be loaded after the LSB, to make up the required
16 data bits. Similarly, for the 12-bit family members(LTC2641-12/LTC2642-12)
four “don’t-care” bits must follow the LSB.

http://www.linear.com/product/LTC2642 http://www.linear.com/product/LTC2641

http://www.linear.com/product/LTC2642#demoboards http://www.linear.com/product/LTC2641#demoboards

Copyright 2018(c) Analog Devices, Inc.

All rights reserved.

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Header for LTC2642: 16-/14-/12-Bit VOUT DAC with SPI Interface

Definition in file LTC2642.h.

Go to the source code of this file.

Functions

void LTC2642_write (uint8_t cs, uint16_t data)
 Writes the 16-bit data into the DAC. More...
 
float LTC2642_code_to_voltage (uint16_t data, float reference_voltage, uint8_t range)
 Calculates the output voltage from the given digital code and reference voltage. More...
 
uint16_t LTC2642_voltage_to_code (float voltage, float reference_voltage, uint8_t range)
 Calculates the 16 bit data code from voltage. More...
 

Macros

#define LTC2642_CS   QUIKEVAL_CS
 Define the SPI CS pin. More...
 
#define UNIPOLAR   1
 
#define BIPOLAR   2
 

Function Documentation

◆ LTC2642_code_to_voltage()

float LTC2642_code_to_voltage ( uint16_t  data,
float  reference_voltage,
uint8_t  range 
)

Calculates the output voltage from the given digital code and reference voltage.

Returns
Floating point voltage
Parameters
data16-bit digital input data
reference_voltageReference voltage
rangeUnipolar/Bipolar

Definition at line 107 of file LTC2642.cpp.

◆ LTC2642_voltage_to_code()

uint16_t LTC2642_voltage_to_code ( float  voltage,
float  reference_voltage,
uint8_t  range 
)

Calculates the 16 bit data code from voltage.

Returns
16-bit code
Parameters
voltageAnalog voltage to be converted into code
reference_voltageReference Voltage
rangeUnipolar/Bipolar

Definition at line 92 of file LTC2642.cpp.

◆ LTC2642_write()

void LTC2642_write ( uint8_t  cs,
uint16_t  data 
)

Writes the 16-bit data into the DAC.

Returns
void
Parameters
csChip Select Pin
data16-bit digital input data

Definition at line 85 of file LTC2642.cpp.

Macro Definition Documentation

◆ BIPOLAR

#define BIPOLAR   2

Definition at line 78 of file LTC2642.h.

◆ LTC2642_CS

#define LTC2642_CS   QUIKEVAL_CS

Define the SPI CS pin.

Definition at line 74 of file LTC2642.h.

◆ UNIPOLAR

#define UNIPOLAR   1

Definition at line 77 of file LTC2642.h.