Linduino  1.3.0
Linear Technology Arduino-Compatible Demonstration Board

LTC2605: Octal 16-/14-/12-Bit Rail-to Rail DACs in 16-Lead SSOP. More...

Detailed Description

LTC2605: Octal 16-/14-/12-Bit Rail-to Rail DACs in 16-Lead SSOP.

The LTC2605/LTC2615/LTC2625 are octal 16-, 14- and 12-bit, 2.7V to 5.5V
rail-to-rail voltage-output DACs in 16-lead narrow SSOP packages. They have
built-in high performance output buffers and are guaranteed monotonic.

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


I2C DATA FORMAT (MSB First):

                    Byte #1                             Byte #2
                    MSB
LTC2655-16 : START  SA6 SA5 SA4 SA3 SA2 SA1 SA0 W SACK  C3 C2 C1 C0 A3 A2 A1 A0 SACK
LTC2655-12 : START  SA6 SA5 SA4 SA3 SA2 SA1 SA0 W SACK  C3 C2 C1 C0 A3 A2 A1 A0 SACK


Byte #3                             Byte #4
                                    LSB
D15 D14 D13 D12 D11 D10 D9 D8 SACK  D7 D6 D5 D4 D3 D2 D1 D0 SACK  STOP
D11 D10 D9  D8  D7  D6  D5 D4 SACK  D3 D2 D1 D0 X  X  X  X  SACK  STOP

START: I2C Start
SAx  : I2C Address
W    : I2C Write (0)
SACK : I2C Slave Generated Acknowledge (Active Low)
Cx   : DAC Command Code
Ax   : DAC Address (0=DACA, 1=DACB, 2=DACC, 3=DACD, 0xFF=All DACs)
Dx   : DAC Data Bits
X    : Don't care
STOP : I2C Stop


Example Code:

Set DAC A to to 2V for 16-bit DAC.

    shift_count = 0;    // 16-bit DAC does not have to be shifted
    dac_voltage = 2.0;  // Sets dac voltage variable to 2v

    dac_code = LTC2605_voltage_to_code(dac_voltage, LTC2605_lsb, LTC2605_offset);   // Calculate DAC code from voltage, lsb, and offset
    ack = LTC2655_write(LTC2605_I2C_ADDRESS, LTC2605_CMD_WRITE_UPDATE, LTC2605_DAC_A, dac_code);    // Set DAC A with DAC code

http://www.linear.com/product/LTC2605

http://www.linear.com/product/LTC2605#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:

  • Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
  • 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.
  • Neither the name of Analog Devices, Inc. nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
  • The use of this software may or may not infringe the patent rights of one or more patent holders. This license does not release you from the requirement that you obtain separate licenses from these patent holders to use this software.
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Header for LTC2605: Octal 16-/14-/12-Bit Rail-to Rail DACs in 16-Lead SSOP

Definition in file LTC2605.h.

Go to the source code of this file.

Macros

LTC2604 Address Assignments

Use table to select address

LTC2604 I2C Address AssignmentValue AD2 AD1 AD0
LTC2605_I2C_ADDRESS 0x10 GND GND GND
LTC2605_I2C_ADDRESS 0x11 GND GND Float
LTC2605_I2C_ADDRESS 0x12 GND GND Vcc
LTC2605_I2C_ADDRESS 0x13 GND Float GND
LTC2605_I2C_ADDRESS 0x20 GND Float Float
LTC2605_I2C_ADDRESS 0x21 GND Float Vcc
LTC2605_I2C_ADDRESS 0x22 GND Vcc GND
LTC2605_I2C_ADDRESS 0x23 GND Vcc Float
LTC2605_I2C_ADDRESS 0x30 GND Vcc Vcc
LTC2605_I2C_ADDRESS 0x31 Float GND GND
LTC2605_I2C_ADDRESS 0x32 Float GND Float
LTC2605_I2C_ADDRESS 0x33 Float GND Vcc
LTC2605_I2C_ADDRESS 0x40 Float Float GND
LTC2605_I2C_ADDRESS 0x41 Float Float Float
LTC2605_I2C_ADDRESS 0x42 Float Float Vcc
LTC2605_I2C_ADDRESS 0x43 Float Vcc GND
LTC2605_I2C_ADDRESS 0x50 Float Vcc Float
LTC2605_I2C_ADDRESS 0x51 Float Vcc Vcc
LTC2605_I2C_ADDRESS 0x52 Vcc GND GND
LTC2605_I2C_ADDRESS 0x53 Vcc GND Float
LTC2605_I2C_ADDRESS 0x60 Vcc GND Vcc
LTC2605_I2C_ADDRESS 0x61 Vcc Float GND
LTC2605_I2C_ADDRESS 0x62 Vcc Float Float
LTC2605_I2C_ADDRESS 0x63 Vcc Float Vcc
LTC2605_I2C_ADDRESS 0x70 Vcc Vcc GND
LTC2605_I2C_ADDRESS 0x71 Vcc Vcc Float
LTC2605_I2C_ADDRESS 0x72 Vcc Vcc Vcc
LTC2605_I2C_GLOBAL_ADDRESS 0x73 X X X
#define LTC2605_I2C_ADDRESS   0x72
 
LTC2655 Command Codes

OR'd together with the DAC address to form the command byte

#define LTC2605_CMD_WRITE   0x00
 Write to input register n. More...
 
#define LTC2605_CMD_UPDATE   0x10
 Update (power up) DAC register n. More...
 
#define LTC2605_CMD_WRITE_UPDATE   0x30
 Write to input register n, update (power up) all. More...
 
#define LTC2605_CMD_POWER_DOWN   0x40
 Power down n. More...
 
#define LTC2605_CMD_POWER_DOWN_ALL   0x50
 Power down chip (all DACs and reference) More...
 
#define LTC2605_CMD_INTERNAL_REFERENCE   0x60
 Select internal reference (power up reference) More...
 
#define LTC2605_CMD_EXTERNAL_REFERENCE   0x70
 Select external reference (power down internal reference) More...
 
#define LTC2605_CMD_NO_OPERATION   0xF0
 No operation. More...
 

Dac Addresses

DAC Addresses Value
LTC2605_DAC_A 0x00
LTC2605_DAC_B 0x01
LTC2605_DAC_C 0x02
LTC2605_DAC_D 0x03
LTC2605_DAC_E 0x04
LTC2605_DAC_F 0x05
LTC2605_DAC_G 0x06
LTC2605_DAC_H 0x07
LTC2605_DAC_ALL 0x0F
#define LTC2605_DAC_A   0x00
 
#define LTC2605_DAC_B   0x01
 
#define LTC2605_DAC_C   0x02
 
#define LTC2605_DAC_D   0x03
 
#define LTC2605_DAC_E   0x04
 
#define LTC2605_DAC_F   0x05
 
#define LTC2605_DAC_G   0x06
 
#define LTC2605_DAC_H   0x07
 
#define LTC2605_DAC_ALL   0x0F
 
int8_t LTC2605_write (uint8_t i2c_address, uint8_t dac_command, uint8_t dac_address, uint16_t dac_code)
 Write a 16-bit dac_code to the LTC2605. More...
 
uint16_t LTC2605_voltage_to_code (float dac_voltage, float LTC2605_lsb, int16_t LTC2605_offset)
 Calculate a LTC2605 DAC code given the desired output voltage. More...
 
float LTC2605_code_to_voltage (uint16_t dac_code, float LTC2605_lsb, int16_t LTC2605_offset)
 Calculate the LTC2605 DAC output voltage given the DAC code, offset, and LSB value. More...
 

Function Documentation

◆ LTC2605_code_to_voltage()

float LTC2605_code_to_voltage ( uint16_t  dac_code,
float  LTC2605_lsb,
int16_t  LTC2605_offset 
)

Calculate the LTC2605 DAC output voltage given the DAC code, offset, and LSB value.

Returns
Calculated voltage
Parameters
dac_codeDAC code
LTC2605_lsbLSB value
LTC2605_offsetOffset

Definition at line 98 of file LTC2605.cpp.

◆ LTC2605_voltage_to_code()

uint16_t LTC2605_voltage_to_code ( float  dac_voltage,
float  LTC2605_lsb,
int16_t  LTC2605_offset 
)

Calculate a LTC2605 DAC code given the desired output voltage.

Returns
The 16-bit code to send to the DAC
Parameters
dac_voltageVoltage to send to DAC
LTC2605_lsbLSB value
LTC2605_offsetOffset

Definition at line 85 of file LTC2605.cpp.

◆ LTC2605_write()

int8_t LTC2605_write ( uint8_t  i2c_address,
uint8_t  dac_command,
uint8_t  dac_address,
uint16_t  dac_code 
)

Write a 16-bit dac_code to the LTC2605.

Returns
ACK bit (0=acknowledge, 1=no acknowledge)
Parameters
i2c_addressI2C address of DAC
dac_commandCommand Nibble, left-justified, lower nibble set to zero
dac_addressDAC Address Nibble, right justified, upper nibble set to zero
dac_code16-bit DAC code

Definition at line 76 of file LTC2605.cpp.

Macro Definition Documentation

◆ LTC2605_CMD_EXTERNAL_REFERENCE

#define LTC2605_CMD_EXTERNAL_REFERENCE   0x70

Select external reference (power down internal reference)

Definition at line 186 of file LTC2605.h.

◆ LTC2605_CMD_INTERNAL_REFERENCE

#define LTC2605_CMD_INTERNAL_REFERENCE   0x60

Select internal reference (power up reference)

Definition at line 185 of file LTC2605.h.

◆ LTC2605_CMD_NO_OPERATION

#define LTC2605_CMD_NO_OPERATION   0xF0

No operation.

Definition at line 187 of file LTC2605.h.

◆ LTC2605_CMD_POWER_DOWN

#define LTC2605_CMD_POWER_DOWN   0x40

Power down n.

Definition at line 183 of file LTC2605.h.

◆ LTC2605_CMD_POWER_DOWN_ALL

#define LTC2605_CMD_POWER_DOWN_ALL   0x50

Power down chip (all DACs and reference)

Definition at line 184 of file LTC2605.h.

◆ LTC2605_CMD_UPDATE

#define LTC2605_CMD_UPDATE   0x10

Update (power up) DAC register n.

Definition at line 181 of file LTC2605.h.

◆ LTC2605_CMD_WRITE

#define LTC2605_CMD_WRITE   0x00

Write to input register n.

Definition at line 180 of file LTC2605.h.

◆ LTC2605_CMD_WRITE_UPDATE

#define LTC2605_CMD_WRITE_UPDATE   0x30

Write to input register n, update (power up) all.

Definition at line 182 of file LTC2605.h.

◆ LTC2605_DAC_A

#define LTC2605_DAC_A   0x00

Definition at line 207 of file LTC2605.h.

◆ LTC2605_DAC_ALL

#define LTC2605_DAC_ALL   0x0F

Definition at line 215 of file LTC2605.h.

◆ LTC2605_DAC_B

#define LTC2605_DAC_B   0x01

Definition at line 208 of file LTC2605.h.

◆ LTC2605_DAC_C

#define LTC2605_DAC_C   0x02

Definition at line 209 of file LTC2605.h.

◆ LTC2605_DAC_D

#define LTC2605_DAC_D   0x03

Definition at line 210 of file LTC2605.h.

◆ LTC2605_DAC_E

#define LTC2605_DAC_E   0x04

Definition at line 211 of file LTC2605.h.

◆ LTC2605_DAC_F

#define LTC2605_DAC_F   0x05

Definition at line 212 of file LTC2605.h.

◆ LTC2605_DAC_G

#define LTC2605_DAC_G   0x06

Definition at line 213 of file LTC2605.h.

◆ LTC2605_DAC_H

#define LTC2605_DAC_H   0x07

Definition at line 214 of file LTC2605.h.

◆ LTC2605_I2C_ADDRESS

#define LTC2605_I2C_ADDRESS   0x72

Definition at line 169 of file LTC2605.h.