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ADS1174IPAPT Datasheet(PDF) 9 Page - Texas Instruments |
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ADS1174IPAPT Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 35 page  www.ti.com OVERVIEW DS Modulator1 Digital Filter1 VREFP V IN1 VREFN V REF S TEST[1:0] FORMAT[2:0] CLK SYNC PWDN (1) [4:1]/[8:1] CLKDIV MODE DRDY/FSYNC SCLK DOUT[4:1]/[8:1] (1) DIN SPI and Frame-Sync Interface Control Logic AINP1 AINN1 VCOM S DS Modulator2 Digital Filter2 V IN2 S AINP2 AINN2 DS Modulator4/8 (1) Digital Filter4/8 (1) V IN4/8 S AINP4/8 (1) AINN4/8 (1) DVDD AVDD AGND DGND IOVDD R R NOTE:(1)TheADS1174hasfourchannels;theADS1178haseightchannels. ADS1174 ADS1178 SBAS373 – OCTOBER 2007 To allow tradeoffs between speed and power, two The ADS1174 (quad) and ADS1178 (octal) are 16-bit, modes of operation are supported: High-Speed and delta-sigma ADCs. They offer the combination of Low-Power. Table 1 summarizes the performance of excellent linearity, low noise, and low power each mode. consumption. Figure 1 shows the block diagram. Note that both devices are the same, except the ADS1174 In High-Speed mode, the data rate is 52kSPS, and in has four ADCs, and the ADS1178 has eight ADCs. Low-Power mode, the power dissipation is only The pinout and package of the ADS1178 is 8mW/channel at 10.5kSPS. compatible with the ADS1174, permitting drop-in The ADS1174/78 is configured by simply setting the expandability. The converters are comprised of either appropriate I/O pins—there are no registers to four (ADS1174) or eight (ADS1178) advanced, program. Data is retrieved over a serial interface that 6th-order, chopper-stabilized, delta-sigma modulators supports both SPI and Frame-Sync formats. The followed by low-ripple, linear phase FIR filters. The ADS1174/78 has a daisy-chainable output and the modulators measure the differential input signal, VIN = ability to synchronize externally, so it can be used (AINP – AINN), against the differential reference, conveniently in systems requiring more than eight VREF = (VREFP – VREFN). The digital filters receive channels. the modulator signal and provide a low-noise digital output. Figure 1. ADS1174/ADS1178 Block Diagram Table 1. Operating Mode Performance Summary POWER DISSIPATION DATA RATE PASSBAND SNR NOISE PER CHANNEL(1) MODE (SPS) (Hz) (dB) (LSBPP) (mW) High-Speed 52,734 23,889 97 1 32 Low-Power 10,547 4,536 97 1 8 (1) Measured with all channels operating. Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): ADS1174 ADS1178 |
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