Linduino  1.3.0
Linear Technology Arduino-Compatible Demonstration Board

LTC2607: 16-Bit, Dual Rail-to-Rail DACs with I2C Interface. More...

Detailed Description

LTC2607: 16-Bit, Dual Rail-to-Rail DACs with I2C Interface.

LTC2609: Quad 16-/14-/12-Bit Rail-to-Rail DACs with I²C Interface. LTC2606: 16-Bit Rail-to-Rail DACs with I²C Interface.

The LTC2607/LTC2617/LTC2627 are dual 16-, 14- and 12-bit, 2.7V to 5.5V
rail-to-rail voltage output DACs in a 12-lead DFN package. They have built-in
high performance output buffers and are guaranteed monotonic.

These parts establish new board-density benchmarks for 16- and 14-bit DACs and
advance performance standards for output drive and load regulation in single-
supply, voltage-output DACs.

The parts use a 2-wire, I2C compatible serial interface. The
LTC2607/LTC2617/LTC2627 operate in both the standard mode (clock rate of 100kHz)
and the fast mode (clock rate of 400kHz). An asynchronous DAC update pin (LDAC)
is also included.

The LTC2607/LTC2617/LTC2627 incorporate a power-on reset circuit. During power-
up, the voltage outputs rise less than 10mV above zero scale; and after power-
up, they stay at zero scale until a valid write and update take place. The
power-on reset circuit resets the LTC2607-1/LTC2617-1/ LTC2627-1 to mid-scale.
The voltage outputs stay at midscale until a valid write and update takes place.

I2C DATA FORMAT (MSB First):

       Byte #1                             Byte #2                          Byte #3                              Byte #4

START  SA6 SA5 SA4 SA3 SA2 SA1 SA0 W SACK  C3 C2 C1 C0  A3  A2 A1 A0  SACK  D15 D14 D13 D12 D11 D10 D9 D8  SACK  D7 D6  D5  D4  D3  D2  D1  D0 SACK STOP

SACK : Slave Acknowlege
SAx  : I2C Address
W    : I2C Write (0)
R    : I2C Read  (1)
SACK : I2C Slave Generated Acknowledge (Active Low)
Cx   : DAC Command Code
Ax   : DAC Address
Dx   : DAC Data Bits
X    : Don't care


Example Code:

Set DAC A to Full Scale.

    dac_code = 0x0FFFF; // Set dac code to full scale

    // Write dac code to the LTC2607 and update dac
    ack = LTC2607_write(LTC2607_I2C_GLOBAL_ADDRESS, LTC2607_WRITE_UPDATE_COMMAND, LTC2607_DAC_A, dac_code);

http://www.linear.com/product/LTC2607 http://www.linear.com/product/LTC2609 http://www.linear.com/product/LTC2606

http://www.linear.com/product/LTC2607#demoboards http://www.linear.com/product/LTC2609#demoboards http://www.linear.com/product/LTC2606#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:

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  • Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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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 File for LTC2607: 16-Bit, Dual Rail-to-Rail DACs with I2C Interface

Definition in file LTC2607.h.

Go to the source code of this file.

Functions

int8_t LTC2607_write (uint8_t i2c_address, uint8_t dac_command, uint8_t dac_address, uint16_t dac_code)
 Writes command, DAC address, and DAC code to the LTC2607. More...
 
uint16_t LTC2607_voltage_to_code (float dac_voltage, float LTC2607_lsb, int32_t LTC2607_offset)
 Calculates an LTC2607 DAC code for the desired output voltage. More...
 
void LTC2607_calibrate (uint16_t dac_code1, uint16_t dac_code2, float voltage1, float voltage2, float *LTC2607_lsb, int32_t *LTC2607_offset)
 Calculates the LTC2607 offset and lsb voltage given two measured voltages and their corresponding DAC codes. More...
 

Macros

I2C_Addresses
#define LTC2607_I2C_ADDRESS   0x10
 I2C address of the LTC2607. More...
 
#define LTC2607_I2C_GLOBAL_ADDRESS   0x73
 LTC2607 Global I2C Address. More...
 
DAC Command
#define LTC2607_WRITE_COMMAND   0x00
 Command to write to internal register of LTC2607, but not update output voltage yet. More...
 
#define LTC2607_UPDATE_COMMAND   0x10
 Command to update (and power up) LTC2607. More...
 
#define LTC2607_WRITE_UPDATE_COMMAND   0x30
 Command to write and update (and power up) the LTC2607. More...
 
#define LTC2607_POWER_DOWN_COMMAND   0x40
 Command to power down the LTC2607. More...
 
DAC Address
#define LTC2607_DAC_A   0x00
 Command (and DAC code) will modify DAC A. More...
 
#define LTC2607_DAC_B   0x01
 Command (and DAC code) will modify DAC B. More...
 
#define LTC2607_ALL_DACS   0x0F
 Command (and DAC code) will modify both DAC A and DAC B. More...
 

Variables

const float LTC2607_TYPICAL_lsb = 7.6295109E-5
 The LTC2607 typical least significant bit value with 5V full-scale. More...
 
const float LTC2607_TYPICAL_OFFSET = 0
 The LTC2607 typical offset voltage. More...
 

Function Documentation

◆ LTC2607_calibrate()

void LTC2607_calibrate ( uint16_t  dac_code1,
uint16_t  dac_code2,
float  voltage1,
float  voltage2,
float *  LTC2607_lsb,
int32_t *  LTC2607_offset 
)

Calculates the LTC2607 offset and lsb voltage given two measured voltages and their corresponding DAC codes.

Prior to calling this function, write two DAC codes to the LTC2607, and measure the output voltage for each DAC code. When passed the DAC codes and measured voltages as parameters, this function calculates the calibrated lsb and offset values.

Parameters
dac_code1DAC Code 1.
dac_code2DAC Code 2.
voltage1Measured output voltage corresponding to DAC Code 1.
voltage2Measured output voltage corresponding to DAC Code 2.
LTC2607_lsbOverwritten with new calculated lsb voltage.
LTC2607_offsetOverwritten with new calculated offset voltage.

Definition at line 127 of file LTC2607.cpp.

◆ LTC2607_voltage_to_code()

uint16_t LTC2607_voltage_to_code ( float  dac_voltage,
float  LTC2607_lsb,
int32_t  LTC2607_offset 
)

Calculates an LTC2607 DAC code for the desired output voltage.

Based on the desired output voltage, the offset, and lsb parameters, return the corresponding DAC code that should be written to the LTC2607.

Returns
DAC code for desired output voltage
Parameters
dac_voltageDesired DAC output voltage.
LTC2607_lsbThe LSB weight. Use calibrated value for best results, otherwise use typical value from datasheet.
LTC2607_offsetThe offset voltage. Use calibrated value for best results, otherwise use typical value from datasheet.

Definition at line 110 of file LTC2607.cpp.

◆ LTC2607_write()

int8_t LTC2607_write ( uint8_t  i2c_address,
uint8_t  dac_command,
uint8_t  dac_address,
uint16_t  dac_code 
)

Writes command, DAC address, and DAC code to the LTC2607.

Configures command (write, update, power down, etc.), address (DAC A, DAC B, or BOTH), and 16-bit dac_code for output voltage.

Returns
Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge.
Parameters
i2c_addressI2C address of the LTC2607. Configured by CA0, CA1, and CA2 pins. See Table 1 of datasheet.
dac_commandDAC command (4-bits) that will be written to LTC2607. (Write, update, power down, etc.)
dac_addressDAC address (4-bits) that will be written to LTC2607. Configures DAC A, DAC B, or both.
dac_codeDAC code that will be written to LTC2607. This configures the output voltage.

Definition at line 100 of file LTC2607.cpp.

Macro Definition Documentation

◆ LTC2607_ALL_DACS

#define LTC2607_ALL_DACS   0x0F

Command (and DAC code) will modify both DAC A and DAC B.

Definition at line 163 of file LTC2607.h.

◆ LTC2607_DAC_A

#define LTC2607_DAC_A   0x00

Command (and DAC code) will modify DAC A.

Definition at line 161 of file LTC2607.h.

◆ LTC2607_DAC_B

#define LTC2607_DAC_B   0x01

Command (and DAC code) will modify DAC B.

Definition at line 162 of file LTC2607.h.

◆ LTC2607_I2C_ADDRESS

#define LTC2607_I2C_ADDRESS   0x10

I2C address of the LTC2607.

Configured with the CA0, CA1, and CA2 pins. See Table 1 of datasheet. Uncomment LTC2607_I2C_ADDRESS to match demo board configuration.

Definition at line 116 of file LTC2607.h.

◆ LTC2607_I2C_GLOBAL_ADDRESS

#define LTC2607_I2C_GLOBAL_ADDRESS   0x73

LTC2607 Global I2C Address.

Definition at line 145 of file LTC2607.h.

◆ LTC2607_POWER_DOWN_COMMAND

#define LTC2607_POWER_DOWN_COMMAND   0x40

Command to power down the LTC2607.

Definition at line 154 of file LTC2607.h.

◆ LTC2607_UPDATE_COMMAND

#define LTC2607_UPDATE_COMMAND   0x10

Command to update (and power up) LTC2607.

Output voltage will be set to the value stored in the internal register by previous write command.

Definition at line 152 of file LTC2607.h.

◆ LTC2607_WRITE_COMMAND

#define LTC2607_WRITE_COMMAND   0x00

Command to write to internal register of LTC2607, but not update output voltage yet.

Definition at line 151 of file LTC2607.h.

◆ LTC2607_WRITE_UPDATE_COMMAND

#define LTC2607_WRITE_UPDATE_COMMAND   0x30

Command to write and update (and power up) the LTC2607.

The output voltage will immediate change to the value being written to the internal register.

Definition at line 153 of file LTC2607.h.

Variable Documentation

◆ LTC2607_TYPICAL_lsb

const float LTC2607_TYPICAL_lsb = 7.6295109E-5

The LTC2607 typical least significant bit value with 5V full-scale.

Definition at line 167 of file LTC2607.h.

◆ LTC2607_TYPICAL_OFFSET

const float LTC2607_TYPICAL_OFFSET = 0

The LTC2607 typical offset voltage.

Definition at line 168 of file LTC2607.h.