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CS5543 Datasheet(PDF) 10 Page - Cirrus Logic |
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CS5543 Datasheet(HTML) 10 Page - Cirrus Logic |
10 / 30 page CS5542 CS5543 10 DS109PP2 GENERAL DESCRIPTION The CS5542 is a monolithic CMOS dual delta-sig- ma modulator. Each modulator in the CS5542 ac- cepts a low level current input, usually supplied by a photodiode (see Figure 1). This current is digi- tized by the CS5542 modulator and filtered by the CS5543 digital FIR decimation filter. Four CS5542 modulator chips can be combined with one CS5543 filter chip to provide eight channels of data conver- sion as shown in Figure 2. Up to 128 8-channel blocks of CS5542/CS5543 chip sets can be con- nected to build a 1024 channel system as shown in Figure 3. The CS5542/CS5543 combination sup- ports several calibration modes for the data acqui- sition system. THEORY OF OPERATION The CS5542/CS5543 chip set is designed to con- struct multi-channel current input digitizer sys- tems. The conversion clock input (CLKIN) into the CS5543 provides the master clock for the digi- tal filter. This clock can be as fast as 2.048 MHz. CLKIN is buffered inside the CS5543 and is passed to each of the CS5542 modulator chips as the MCLK (modulator clock) signal. The CS5542/ CS5543 combination provides output conversion data at a word rate equal to CLKIN/2048. INL REFGNDL GNDL ICAL INR REFGNDR GNDR VA- VA+ VD+ DGND MDATA [3:0] C [2:0] CAL [1:0] FSYNC MCLK PDN CAPSIZE VREF+ VREF- SEL0 SEL1 CS5542 +4.0 V -4.0 V .1 µF Photodiode Reference 8 MEG +5 V -5V 5 6 4 10 8 7 9 13 12 23 22 25,24,21,20 28,27,26 19, 18 16 17 11 1 32 14 15 2 3 4 To CS5543 Decimator Photodiode -4.0 V I FS IR 10 µF .1 µF .1 µF10 µF .1 µF 10 Ω Differential Reference Voltage .1 µF Note 1 Note 1: Diodes can be connected with either polarity. As shown the CS5542/43 will generate a more negative code as the photodiode outputs more current. 2: The ICAL current can be of either polarity. Its magnitude will determine the full scale measurement range. Note 1 Note 2 DGND AGND Figure 1. CS5542 Typical Connection Diagram |
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