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Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
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LTC2640: Single 12-/10-/8-Bit Rail-to-Rail DACs with 10ppm/C Reference. More...
LTC2640: Single 12-/10-/8-Bit Rail-to-Rail DACs with 10ppm/C Reference.
LTC2630: Single 12-/10-/8-Bit Rail-to-Rail DACs with Integrated Reference in SC70.
The LTC2640 is a family of 12-, 10-, and 8-bit voltage-output DACs with an integrated, high-accuracy, low-drift reference in an 8-lead TSOT-23 package. It has a rail-to-rail output buffer that is guaranteed monotonic. The LTC2640-L has a full-scale output of 2.5V, and operates from a single 2.7V to 5.5V supply. The LTC2640-H has a full-scale output of 4.096V, and operates from a 4.5V to 5.5V supply. A 10 ppm/C reference output is available at the REF pin. Each DAC can also operate in External Reference mode, in which a voltage supplied to the REF pin sets the full- scale output. The LTC2640 DACs use a SPI/MICROWIRE compatible 3-wire serial interface which operates at clock rates up to 50 MHz. The LTC2640 incorporates a power-on reset circuit. Options are available for Reset to Zero Scale or Reset to Midscale after power-up. SPI DATA FORMAT (MSB First): Byte #1 Byte #2 Byte #3 (LTC2640-12) Data In : C3 C2 C1 C0 X X X X D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X (LTC2640-10) Data In : C3 C2 C1 C0 X X X X D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X X X (LTC2640-8) Data In : C3 C2 C1 C0 X X X X D7 D6 D5 D4 D3 D2 D1 D0 X X X X X X X X Cx : DAC Command Code Dx : Data Bits X : Don't care Example Code: Set DAC to 1V for 12-bit DAC. shift_count = 4; // Set shift count for 12-bit DAC dac_voltage = 1.0; // Set dac voltage variable to 1V; dac_code = LTC2640_voltage_to_code(dac_voltage, LTC2640_lsb, LTC2640_offset); // Calculates DAC code from desired voltage LTC2640_write(LTC2640_CS, LTC2640_CMD_WRITE_UPDATE, dac_code << shift_count);
http://www.linear.com/product/LTC2640 http://www.linear.com/product/LTC2630
http://www.linear.com/product/LTC2640#demoboards http://www.linear.com/product/LTC2630#demoboards
Copyright 2018(c) Analog Devices, Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Header for LTC2640 Single 12-/10-/8-Bit Rail-to-Rail DACs with 10ppm/C Reference
Definition in file LTC2640.h.
Go to the source code of this file.
Functions | |
void | LTC2640_write (uint8_t cs, uint8_t dac_command, uint16_t dac_code) |
Write the dac_command and 16-bit dac_code to the LTC2640. More... | |
uint16_t | LTC2640_voltage_to_code (float dac_voltage, float LTC2640_lsb, int16_t LTC2640_offset) |
Calculate the LTC2640 DAC code given the desired output voltage. More... | |
float | LTC2640_code_to_voltage (uint16_t dac_code, float LTC2640_lsb, int16_t LTC2640_offset) |
Calculate the LTC2640 DAC output voltage given the DAC code, offset, and LSB value. More... | |
void | LTC2640_calibrate (uint16_t dac_code1, uint16_t dac_code2, float voltage1, float voltage2, float *LTC2640_lsb, int16_t *LTC2640_offset) |
Calculate the LTC2640 offset and LSB voltages given two measured voltages and their corresponding codes. More... | |
Macros | |
#define | LTC2640_CS QUIKEVAL_CS |
Define the SPI CS pin. More... | |
LTC2640 Command Codes (C3-C0) | |
#define | LTC2640_CMD_WRITE 0x00 |
#define | LTC2640_CMD_UPDATE 0x10 |
#define | LTC2640_CMD_WRITE_UPDATE 0x30 |
#define | LTC2640_CMD_POWER_DOWN 0x40 |
#define | LTC2640_CMD_INTERNAL_REFERENCE 0x60 |
#define | LTC2640_CMD_EXTERNAL_REFERENCE 0x70 |
void LTC2640_calibrate | ( | uint16_t | dac_code1, |
uint16_t | dac_code2, | ||
float | voltage1, | ||
float | voltage2, | ||
float * | LTC2640_lsb, | ||
int16_t * | LTC2640_offset | ||
) |
Calculate the LTC2640 offset and LSB voltages given two measured voltages and their corresponding codes.
dac_code1 | First DAC code |
dac_code2 | Second DAC code |
voltage1 | First voltage |
voltage2 | Second voltage |
LTC2640_lsb | Returns resulting LSB (volts) |
LTC2640_offset | Returns resulting Offset (volts) |
Definition at line 123 of file LTC2640.cpp.
float LTC2640_code_to_voltage | ( | uint16_t | dac_code, |
float | LTC2640_lsb, | ||
int16_t | LTC2640_offset | ||
) |
Calculate the LTC2640 DAC output voltage given the DAC code, offset, and LSB value.
dac_code | DAC code |
LTC2640_lsb | LSB value (volts) |
LTC2640_offset | Offset (volts) |
Definition at line 115 of file LTC2640.cpp.
uint16_t LTC2640_voltage_to_code | ( | float | dac_voltage, |
float | LTC2640_lsb, | ||
int16_t | LTC2640_offset | ||
) |
Calculate the LTC2640 DAC code given the desired output voltage.
dac_voltage | Voltage to send to DAC |
LTC2640_lsb | LSB value (volts) |
LTC2640_offset | Offset (volts) |
Definition at line 101 of file LTC2640.cpp.
void LTC2640_write | ( | uint8_t | cs, |
uint8_t | dac_command, | ||
uint16_t | dac_code | ||
) |
Write the dac_command and 16-bit dac_code to the LTC2640.
The dac_code must be left aligned before calling this function.
cs | Chip Select Pin |
dac_command | Command code nibble |
dac_code | 12-bit DAC code, left justified |
Definition at line 87 of file LTC2640.cpp.
#define LTC2640_CS QUIKEVAL_CS |