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LMP90100MHE/NOPB Datasheet(PDF) 22 Page - Texas Instruments |
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LMP90100MHE/NOPB Datasheet(HTML) 22 Page - Texas Instruments |
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22 / 69 page  LMP90100 SNAS510P – JANUARY 2011 – REVISED MARCH 2013 www.ti.com FUNCTIONAL DESCRIPTION Throughout this datasheet, the LMP90100/LMP90099/LMP90098/LMP90097 will be referred to as the LMP90xxx. The LMP90xxx is a low-power 24-Bit ΣΔ ADC with 4 fully differential / 7 single-ended analog channels for the LMP90100/LMP90099 and 2 full differential / 4 single-ended for the LMP90098/LMP90097. Its serial data output is two’s complement format. The output data rate (ODR) ranges from 1.6775 SPS to 214.65 SPS. The serial communication for LMP90xxx is SPI, a synchronous serial interface that operates using 4 pins: chip select bar (CSB), serial clock (SCLK), serial data in (SDI), and serial data out / data ready bar (SDO/DRYDYB). True continuous built-in offset and gain background calibration is also available to improve measurement accuracy. Unlike other ADCs, the LMP90xxx’s background calibration can run without heavily impacting the input signal. This unique technique allows for positive as well as negative gain calibration and is available at all gain settings. The registers can be found in Registers, and a detailed description of the LMP90xxx are provided in the following sections. SIGNAL PATH Reference Input (VREF) The differential reference voltage VREF (VREFP – VREFN) sets the range for VIN. The muxed VREF allows the user to choose between VREF1 or VREF2 for each channel. This selection can be made by programming the VREF_SEL bit in the CHx_INPUTCN registers (CHx_INPUTCN: VREF_SEL). The default mode is VREF1. If VREF2 is used, then VIN6 and VIN7 cannot be used as inputs because they share the same pin. Refer to VREF for VREF applications information. Flexible Input MUX (VIN) LMP90xxx provides a flexible input MUX as shown in Figure 35. The input that is digitized is VIN = VINP – VINN; where VINP and VINN can be any availablie input. The digitized input is also known as a channel, where CH = VIN = VINP – VINN. Thus, there are a maximum of 4 differential channels: CH0, CH1, CH2, and CH3 for the LMP90100/LMP90099. The LMP90098/LMP90097 has a maximum of 2 differential channels: CH0 and CH1 because it does not have access to the VIN3, VIN4, and VIN5 pins. LMP90xxx can also be configured single-endedly, where the common ground is any one of the inputs. There are a maximum of 7 single-ended channels: CH0, CH1, CH2, CH3, CH4, CH5, and CH6 for the LMP90100/LMP90099 and 4: CH0, CH1, CH2, CH3 for the LMP90098/LMP90097. The input MUX can be programmed in the CHx_INPUTCN registers. For example on the LMP90100, to program CH0 = VIN = VIN4 – VIN1, go to the CH0_INPUTCN register and set: 1. VINP = 0x4 2. VINN = 0x1 22 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Product Folder Links: LMP90100 |
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