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ADS1158 Datasheet(PDF) 11 Page - Texas Instruments |
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ADS1158 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 50 page  OVERVIEW AIN0 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AIN8 AIN9 AIN10 AIN11 AIN12 AIN13 AIN14 AIN15 AINCOM Control Logic VREFP VREFN AVSS PLLCAP XTAL1 XTAL2 DRDY PWDN RESET START SPI Interface CS SCLK DIN DOUT DigitalFilter ClockControl 16-Channel MUX AVDD Sensor Bias MUXOUTP MUXOUTN ADCINP GND ADCINN ADCChannelControl SupplyMonitor GPIO GPIO[7:0] DVDD Temperature ExtRefMonitor InternalRef ADC CLKSEL CLKIO ADS1158 www.ti.com ............................................................................................................................................................. SBAS429A – JUNE 2008 – REVISED JUNE 2008 The ADS1158 is a flexible, 16-bit, low-noise ADC The ADS1158 converter consists of a fourth-order, optimized for fast multi-channel, high-resolution delta-sigma modulator followed by a programmable measurement systems. The converter provides a digital filter. The modulator measures the differential maximum channel scan rate of 23.7kSPS, giving a input signal, VIN = (ADCINP – ADCINN), against the complete 16-channel scan in less than 700 µs. differential reference input, VREF = (VREFP – VREFN). The digital filter receives the modulator Figure 20 shows the block diagram of the ADS1158. signal and provides a low-noise digital output. The The input multiplexer selects which analog input pins ADC channel block controls the multiplexer connect to the multiplexer output pins Auto-Scan feature. Channel Auto-Scan occurs at a (MUXOUTP/MUXOUTN). External signal conditioning maximum rate of 23.7kSPS. Slower scan rates can can be used between the multiplexer output pins and be used with corresponding increases in resolution. the ADC input pins (ADCINP/ADCINN) or the multiplexer output can be routed internally to the ADC Communication is handled over an SPI-compatible inputs without external circuitry. Selectable current serial interface with a set of simple commands to sources within the input multiplexer can be used to control the ADS1158. Onboard registers store the bias sensors or detect for a failed sensor. On-chip various settings for the input multiplexer, sensor system function readings provide readback of detect bias, data rate selection, etc. Either an temperature, supply voltage, gain, offset, and external external 32.768kHz crystal, connected to pins XTAL1 reference. and XTAL2, or an external clock applied to pin CLKIO can be used as the clock source. When using the external crystal oscillator, the system clock is available as an output for driving other devices or controllers. General-purpose digital I/Os (GPIO) provide input and output control of eight pins. Figure 20. ADS1158 Block Diagram Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): ADS1158 |
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