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Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
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LTC1867: 16-bit 8-channel 200ksps ADC. More...
LTC1867: 16-bit 8-channel 200ksps ADC.
The LTC1863/LTC1867 are pin-compatible, 8-channel 12-/16-bit A/D converters with serial I/O, and an internal reference. The ADCs typically draw only 1.3mA from a single 5V supply. The 8-channel input multiplexer can be configured for either single-ended or differential inputs and unipolar or bipolar conversions (or combinations thereof). The automatic nap and sleep modes benefit power sensitive applications. The LTC1867's DC performance is outstanding with a +/-2LSB INL specification and no missing codes over temperature. The signal-to-noise ratio (SNR) for the LTC1867 is typically 89dB, with the internal reference. 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 D0 Data In : SD OS S1 S0 COM UNI SLP X X X X X X X X X SD : Single/Differential Bit OS : ODD/Sign Bit Sx : Address Select Bit COM : CH7/COM Configuration Bit UNI : Unipolar/Bipolar Bit SLP : Sleep Mode Bit Dx : Data Bits X : Don't care Example Code: Read Channel 0 in Single-Ended Unipolar mode when input is with respect to GND adc_command = LTC1867_CH0 | LTC1867_UNIPOLAR_MODE; // Build ADC command for channel 0 LTC1867_read(LTC1867_CS, adc_command, &adc_code); // Throws out last reading LTC1867_read(LTC1867_CS, adc_command, &adc_code); // Obtains the current reading and stores to adc_code variable // Convert adc_code to voltage adc_voltage = LTC1867_unipolar_code_to_voltage(adc_code, LTC1867_lsb, LTC1867_offset_unipolar_code);
http://www.linear.com/product/LTC1867
http://www.linear.com/product/LTC1867#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 LTC1867: 16-bit 8-channel 200ksps ADC
Definition in file LTC1867.h.
Go to the source code of this file.
Functions | |
void | LTC1867_read (uint8_t cs, uint8_t adc_command, uint16_t *adc_code) |
Reads the ADC and returns 16-bit data. More... | |
float | LTC1867_unipolar_code_to_voltage (uint16_t adc_code, float LTC1867_lsb, int32_t LTC1867_offset_unipolar_code) |
Calculates the LTC1867 input's unipolar voltage given the binary data and lsb weight. More... | |
float | LTC1867_bipolar_code_to_voltage (uint16_t adc_code, float LTC1867_lsb, int32_t LTC1867_offset_bipolar_code) |
Calculates the LTC1867 input's bipolar voltage given the two's compliment data and lsb weight. More... | |
void | LTC1867_cal_voltage (uint16_t zero_unipolar_code, uint16_t zero_bipolar_code, uint16_t fs_code, float zero_voltage, float fs_voltage, float *LTC1867_lsb, int32_t *LTC1867_offset_unipolar_code, int32_t *LTC1867_offset_bipolar_code) |
Calibrate the offset and LSB voltage given two measured offset codes, and a full-scale voltage with the corresponding code. More... | |
Macros | |
#define | LTC1867_CS QUIKEVAL_CS |
Define the SPI CS pin. More... | |
LTC1867 Single-Ended Channel Addresses, COM=GND | |
#define | LTC1867_CH0 0x80 |
#define | LTC1867_CH1 0xC0 |
#define | LTC1867_CH2 0x90 |
#define | LTC1867_CH3 0xD0 |
#define | LTC1867_CH4 0xA0 |
#define | LTC1867_CH5 0xE0 |
#define | LTC1867_CH6 0xB0 |
#define | LTC1867_CH7 0xF0 |
LTC1867 Differential Channel Addresses | |
#define | LTC1867_P0_N1 0x00 |
#define | LTC1867_P1_N0 0x40 |
#define | LTC1867_P2_N3 0x10 |
#define | LTC1867_P3_N2 0x50 |
#define | LTC1867_P4_N5 0x20 |
#define | LTC1867_P5_N4 0x60 |
#define | LTC1867_P6_N7 0x30 |
#define | LTC1867_P7_N6 0x70 |
LTC1867 Single-Ended Channel Addresses, COM=CH7 | |
#define | LTC1867_CH0_7COM 0x88 |
#define | LTC1867_CH1_7COM 0xC8 |
#define | LTC1867_CH2_7COM 0x98 |
#define | LTC1867_CH3_7COM 0xD8 |
#define | LTC1867_CH4_7COM 0xA8 |
#define | LTC1867_CH5_7COM 0xE8 |
#define | LTC1867_CH6_7COM 0xB8 |
LTC1867 Sleep / Unipolar/Bipolar config bits | |
#define | LTC1867_SLEEP_MODE 0x02 |
#define | LTC1867_EXIT_SLEEP_MODE 0x00 |
#define | LTC1867_UNIPOLAR_MODE 0x04 |
#define | LTC1867_BIPOLAR_MODE 0x00 |
float LTC1867_bipolar_code_to_voltage | ( | uint16_t | adc_code, |
float | LTC1867_lsb, | ||
int32_t | LTC1867_offset_bipolar_code | ||
) |
Calculates the LTC1867 input's bipolar voltage given the two's compliment data and lsb weight.
adc_code | Raw ADC code |
LTC1867_lsb | LSB value (volts) |
LTC1867_offset_bipolar_code | Offset code |
Definition at line 92 of file LTC1867.cpp.
void LTC1867_cal_voltage | ( | uint16_t | zero_unipolar_code, |
uint16_t | zero_bipolar_code, | ||
uint16_t | fs_code, | ||
float | zero_voltage, | ||
float | fs_voltage, | ||
float * | LTC1867_lsb, | ||
int32_t * | LTC1867_offset_unipolar_code, | ||
int32_t * | LTC1867_offset_bipolar_code | ||
) |
Calibrate the offset and LSB voltage given two measured offset codes, and a full-scale voltage with the corresponding code.
zero_unipolar_code | Code from a unipolar zero reading |
zero_bipolar_code | Code from a bipolar zero reading |
fs_code | full-scale code |
zero_voltage | Measured zero voltage |
fs_voltage | Measured full-scale voltage |
LTC1867_lsb | Return LSB value (volts) |
LTC1867_offset_unipolar_code | Return Unipolar Offset code, in floating point |
LTC1867_offset_bipolar_code | Return Bipolar Offset code, in floating point |
Definition at line 105 of file LTC1867.cpp.
void LTC1867_read | ( | uint8_t | cs, |
uint8_t | adc_command, | ||
uint16_t * | adc_code | ||
) |
Reads the ADC and returns 16-bit data.
cs | Chip Select Pin |
adc_command | Channel address, config bits ORed together |
adc_code | Returns code read from ADC (from previous conversion) |
Definition at line 78 of file LTC1867.cpp.
float LTC1867_unipolar_code_to_voltage | ( | uint16_t | adc_code, |
float | LTC1867_lsb, | ||
int32_t | LTC1867_offset_unipolar_code | ||
) |
Calculates the LTC1867 input's unipolar voltage given the binary data and lsb weight.
adc_code | Raw ADC code |
LTC1867_lsb | LSB value (volts) |
LTC1867_offset_unipolar_code | Offset code |
Definition at line 84 of file LTC1867.cpp.
#define LTC1867_CS QUIKEVAL_CS |