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LMP90077MHXNOPB Datasheet(PDF) 3 Page - Texas Instruments |
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LMP90077MHXNOPB Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 64 page  1 VA 2 VIN0 3 VIN1 4 VIN2 5 VIN3 6 VIN4 7 VIN5 8 VREFP1 9 VREFN1 10 VIN6/VREFP2 11 12 28 27 26 25 24 23 22 21 20 19 18 17 VIO D6 / DRDYB D5 D4 D3 D2 D1 D0 SDO/DRDYB SDI SCLK 13 14 LMP900xx 16 15 VIN7/VREFN2 IB2 IB1 XOUT CSB GND XIN/CLK LMP90080/ LMP90078 only LMP90080/ LMP90079 only LMP90077, LMP90078, LMP90079, LMP90080 www.ti.com SNAS521F – JULY 2011 – REVISED MARCH 2013 True Continuous Background Calibration The LMP90080/LMP90079/LMP90078/LMP90077 feature a 16 bit ΣΔ core with continuous background calibration to compensate for gain and offset errors in the ADC, virtually eliminating any drift with time and temperature. The calibration is performed in the background without user or ADC input interruption, making it unique in the industry and eliminating down time associated with field calibration required with other solutions. Having this continuous calibration improves performance over the entire life span of the end product. Continuous Background Sensor Diagnostics Sensor diagnostics are also performed in the background, without interfering with signal path performance, allowing the detection of sensor shorts, opens, and out-of-range signals, which vastly improves system reliability. In addition, the fully flexible input multiplexer described below allows any input pin to be connected to any ADC input channel providing additional sensor path diagnostic capability. Flexible Input MUX Channels The flexible input MUX allows interfacing to a wide range of sensors such as thermocouples, RTDs, thermistors, and bridge sensors. The LMP90080/LMP90079’s multiplexer supports 4 differential channels while the LMP90078/LMP90077 supports 2. Each effective input voltage that is digitized is VIN = VINX – VINY, where x and y are any input. In addition, the input multiplexer of the LMP90080/LMP90079 also supports 7 single-ended channels (LMP90078/LMP90077 supports 4), where the common ground is any one of the inputs. Programmable Gain Amplifiers (FGA & PGA) The LMP90080/LMP90079/LMP90078/LMP90077 contain an internal 16x fixed gain amplifier (FGA) and a 1x, 2x, 4x, or 8x programmable gain amplifier (PGA). This allows accurate gain settings of 1x, 2x, 4x, 8x, 16x, 32x, 64x, or 128x through configuration of internal registers. Having an internal amplifier eliminates the need for external amplifiers that are costly, space consuming, and difficult to calibrate. Excitation Current Sources (IB1 & IB2) - LMP90080/LMP90078 Two matched internal excitation currents, IB1 and IB2, can be used for sourcing currents to a variety of sensors. The current range is from 100 µA to 1000 µA in steps of 100 µA. Connection Diagram Figure 2. 28-pin HTSSOP See Pin Descriptions table below for specific information regarding options LMP90079, LMP90078, and LMP90077. Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LMP90077 LMP90078 LMP90079 LMP90080 |
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