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Linear Technology Arduino-Compatible Demonstration Board

LTC2460 Ultra-Tiny, 16-bit delta sigma ADCs with 10ppm/degree C Max Precision Reference. More...

Detailed Description

LTC2460 Ultra-Tiny, 16-bit delta sigma ADCs with 10ppm/degree C Max Precision Reference.

The LTC2460/LTC2462 are ultra tiny, 16-Bit analog-to- digital converters
with an integrated precision reference. They use a single 2.7V to 5.5V supply
and communicate through an SPI Interface. The LTC2460 is single-ended with
a 0V to VREF input range and the LTC2462 is differential with a ±VREF input
range. Both ADC’s include a 1.25V integrated reference with 2ppm/°C drift
performance and 0.1% initial accuracy. The converters are available in a
12-pin DFN 3mm × 3mm package or an MSOP-12 package. They include an integrated
oscillator and perform conversions with no latency for multiplexed applications.
The LTC2460/LTC2462 include a proprietary input sampling scheme that reduces
the average input current several orders of magnitude when compared to conventional
delta sigma converters.


SPI DATA FORMAT (MSB First):

            Byte #1                            Byte #2

Data Out :  D15 D14 D13 D12 D11 D10 D9 D8   D7 D6 D5 D4 D3 D2 D1 D10
Data In  :  EN1 EN2 SPD SLP  X   X  X  X    X  X  X  X  X  X  X  X


Dx   : Data Bits
EN1/EN2   : Enable Bits (00-keep previous mode, 10-change mode)
SPD  : Double Output Rate Select Bit (1-Normal rate 30hz, auto-calibration on, 0- 2x rate 60hz, auto_calibration off)
SLP : 1 - powers down chip reference after the next conversion is complete
Command Byte #1
EN1  EN2  SPD  SLP  Comments
0    X    X    X    Keep Previous Mode
1    0    1    X    60 Hz conversion
1    0    0    X    30 Hz auto-calibrated conversion

Example Code:

Read in 2X mode without turning off reference

    uint16_t miso_timeout = 1000;
    adc_command =LTC2460_SPEED_2X | LTC2460_REF_ON;   // Build ADC command for channel 0

    LTC2460_read(LTC2460_CS, adc_command, &adc_code);    // Throws out last reading
    delay(50);
    LTC2460_read(LTC2460_CS, adc_command, &adc_code);    // Obtains the current reading and stores to adc_code variable
    // Convert adc_code to voltage
    adc_voltage = LTC2460_code_to_voltage(adc_code, LTC2460_lsb);

http://www.linear.com/product/LTC2460

http://www.linear.com/product/LTC2460#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.
  • Use of the software either in source or binary form, must be run on or directly connected to an Analog Devices Inc. component.

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 LTC2460: Ultra-Tiny, 16-bit delta sigma ADCs with 10ppm/degree C Max Precision Reference

Definition in file LTC2460.h.

Go to the source code of this file.

Functions

void LTC2460_read (uint8_t cs, uint8_t adc_command, int32_t *adc_code)
 
float LTC2460_code_to_voltage (int32_t adc_code, float vref)
 Calculates the voltage corresponding to an adc code, given the reference (in volts) More...
 

Macros

#define LTC2460_CS   QUIKEVAL_CS
 Define the SPI CS pin. More...
 
Mode Configuration
#define LTC2460_KEEP_PREVIOUS_MODE   0x00
 
#define LTC2460_SPEED_1X   0xA0
 
#define LTC2460_SPEED_2X   0x80
 
#define LTC2460_REF_ON   0x00
 
#define LTC2460_REF_OFF   0x10
 

Function Documentation

◆ LTC2460_code_to_voltage()

float LTC2460_code_to_voltage ( int32_t  adc_code,
float  vref 
)

Calculates the voltage corresponding to an adc code, given the reference (in volts)

Returns
Returns voltage calculated from ADC code.
Parameters
adc_codeCode read from adc
vrefVRef (in volts)

Definition at line 86 of file LTC2460.cpp.

◆ LTC2460_read()

void LTC2460_read ( uint8_t  cs,
uint8_t  adc_command,
int32_t *  adc_code 
)

Reads from LTC2460.

Parameters
csChip select
adc_command1 byte command written to LTC2460
adc_code4 byte conversion code read from LTC2460

Definition at line 77 of file LTC2460.cpp.

Macro Definition Documentation

◆ LTC2460_CS

#define LTC2460_CS   QUIKEVAL_CS

Define the SPI CS pin.

Definition at line 101 of file LTC2460.h.

◆ LTC2460_KEEP_PREVIOUS_MODE

#define LTC2460_KEEP_PREVIOUS_MODE   0x00

Definition at line 107 of file LTC2460.h.

◆ LTC2460_REF_OFF

#define LTC2460_REF_OFF   0x10

Definition at line 111 of file LTC2460.h.

◆ LTC2460_REF_ON

#define LTC2460_REF_ON   0x00

Definition at line 110 of file LTC2460.h.

◆ LTC2460_SPEED_1X

#define LTC2460_SPEED_1X   0xA0

Definition at line 108 of file LTC2460.h.

◆ LTC2460_SPEED_2X

#define LTC2460_SPEED_2X   0x80

Definition at line 109 of file LTC2460.h.