LMP90077 Multi-Channel, Low-Power 16-Bit Sensor AFE with True Continuous Background Calibration | TI.com

LMP90077 (ACTIVE)

Multi-Channel, Low-Power 16-Bit Sensor AFE with True Continuous Background Calibration

 

Recommended alternative parts

  • ADS114S06  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   ADS114S06 has more analog inputs (6), faster sample rate (4kSPS), lower power, smaller package, better DC accuracy, internal voltage reference, 2x IDACs

Description

The LLMP9007x and LMP90080 are highly integrated, multi-channel, low-power 16-bit Sensor AFEs. The devices feature a precision, 16-bit Sigma Delta Analog-to-Digital Converter (ADC) with a low-noise programmable gain amplifier and a fully differential high impedance analog input multiplexer. A true continuous background calibration feature allows calibration at all gains and output data rates without interrupting the signal path. The background calibration feature essentially eliminates gain and offset errors across temperature and time, providing measurement accuracy without sacrificing speed and power consumption.

Another feature of the LMP9007x and LMP90080 is continuous background sensor diagnostics, allowing the detection of open and short circuit conditions and out-of-range signals, without requiring user intervention, resulting in enhanced system reliability.

Two sets of independent external reference voltage pins allow multiple ratiometric measurements. In addition, two matched programmable current sources are available in the LMP90080/LMP90078 to excite external sensors such as resistive temperature detectors and bridge sensors. Furthermore, seven GPIO pins are provided for interfacing to external LEDs and switches to simplify control across an isolation barrier.

Collectively, these features make the LMP90080/LMP90079/LMP90078/LMP90077 complete analog front-ends for low-power, precision sensor applications such as temperature, pressure, strain gauge, and industrial process control. The LMP90080/LMP90079/LMP90078/LMP90077 are ensured over the extended temperature range of –40°C to +125°C and are available in a 28-pin package with an exposed pad.

Features

  • 16-Bit Low-Power Sigma Delta ADC
  • True Continuous Background Calibration at All
    Gains
  • In-Place System Calibration Using Expected
    Value Programming
  • Low-Noise Programmable Gain (1x - 128x)
  • Continuous Background Open/Short and Out of
    Range Sensor Diagnostics
  • 8 Output Data Rates (ODR) with Single-Cycle
    Settling
  • 2 Matched Excitation Current Sources from 100
    µA to 1000 µA (LMP90080/LMP90078)
  • 4-DIFF / 7-SE Inputs (LMP90080/LMP90079)
  • 2-DIFF / 4-SE Inputs (LMP90078/LMP90077)
  • 7 General Purpose Input/Output Pins
  • Chopper-Stabilized Buffer for Low Offset
  • SPI 4/3-Wire with CRC Data Link Error Detection
  • 50 Hz to 60 Hz Line Rejection at ODR ≤13.42
    SPS
  • Independent Gain and ODR Selection per
    Channel
  • Supported by WEBENCH® Sensor AFE Designer
  • Automatic Channel Sequencer
  • Key Specifications
    • ENOB/NFR: Up to 16/16 Bits
    • Offset Error (typ): 8.4 nV
    • Gain Error (typ): 7 ppm
    • Total Noise: <10 µV-rms
    • Integral Non-Linearity (INL Max): ±1 LSB
    • Output Data Rates (ODR): 1.6775–214.65 SPS
    • Analog Voltage, VA: 2.85 to 5.5 V
    • Operating Temp Range: –40°C to 125°C
    • Package: 28 Pin Exposed Pad

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Parametrics Compare all products in Precision ADCs (<=10MSPS)

 
Resolution (Bits)
Sample Rate (Max) (kSPS)
Number of input channels
Interface
Operating temperature range (C)
Package Group
Approx. price (US$)
Power consumption (Typ) (mW)
Package size: mm2:W x L (PKG)
Architecture
Input type
Multi-channel configuration
Reference mode
Features
Input range (Max) (V)
Input range (Min) (V)
Analog voltage AVDD (Min) (V)
Analog voltage AVDD (Max) (V)
Digital supply (Min) (V)
Digital supply (Max) (V)
INL (Max) (+/-LSB)
Rating
LMP90077 LMP90078 LMP90079 LMP90080 LMP90097 LMP90098 LMP90099 LMP90100
16     16     16     16     24     24     24     24    
0.215     0.215     0.215     0.215     0.215     0.215     0.215     0.215    
4     4     7     7     4     4     7     7    
SPI     SPI     SPI     SPI     SPI     SPI     SPI     SPI    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
HTSSOP | 28     HTSSOP | 28     HTSSOP | 28     HTSSOP | 28     HTSSOP | 28     HTSSOP | 28     HTSSOP | 28     HTSSOP | 28    
3.55 | 1ku     4.07 | 1ku     4.05 | 1ku     4.20 | 1ku     5.01 | 1ku     5.23 | 1ku     5.56 | 1ku     5.25 | 1ku    
1.2     1.2     1.2     1.2     1.2     1.2     1.2     1.2    
28HTSSOP: 62 mm2: 6.4 x 9.7 (HTSSOP | 28)     28HTSSOP: 62 mm2: 6.4 x 9.7 (HTSSOP | 28)     28HTSSOP: 62 mm2: 6.4 x 9.7 (HTSSOP | 28)     28HTSSOP: 62 mm2: 6.4 x 9.7 (HTSSOP | 28)     28HTSSOP: 62 mm2: 6.4 x 9.7 (HTSSOP | 28)     28HTSSOP: 62 mm2: 6.4 x 9.7 (HTSSOP | 28)     28HTSSOP: 62 mm2: 6.4 x 9.7 (HTSSOP | 28)     28HTSSOP: 62 mm2: 6.4 x 9.7 (HTSSOP | 28)    
Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma     Delta-Sigma    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Differential
Single-Ended    
Multiplexed     Multiplexed     Multiplexed     Multiplexed     Multiplexed     Multiplexed     Multiplexed     Multiplexed    
Ext     Ext     Ext     Ext     Ext     Ext     Ext     Ext    
PGA     Excitation Current Sources (iDACs)
PGA    
PGA     Excitation Current Sources (iDACs)
PGA    
PGA     Excitation Current Sources (iDACs)
PGA    
PGA     Excitation Current Sources (iDACs)
PGA    
5.5     5.5     5.5     5.5     5.5     5.5     5.5     5.5    
0     0     0     0     0     0     0