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AD7783BRU-REEL Scheda tecnica(PDF) 7 Page - Analog Devices |
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AD7783BRU-REEL Scheda tecnica(HTML) 7 Page - Analog Devices |
7 / 12 page REV. B Typical Performance Characteristics–AD7783 –7– 8 7 0 6 5 4 3 2 1 9 TPC 1. Noise Distribution Histogram ADC CIRCUIT INFORMATION Overview The AD7783 incorporates a S-D ADC channel, on-chip pro- grammable gain amplifier, and on-chip digital filtering intended for the measurement of wide dynamic range, low frequency signals such as those in weigh-scale, strain gage, pressure trans- ducer, or temperature measurement applications. This ADC input is buffered and can be programmed to have an input voltage range of ±160 mV or ±2.56 V. The input channel is configured as a fully differential input. Buffering the input channel means that the part can accommodate significant source impedances on the analog input and that R, C filtering (for noise rejection or RFI reduction) can be placed on the analog input if required. The device requires an external reference of 2.5 V nominal. Figure 3 shows the basic connections required to operate the part. AD7783 REFIN(+) REFIN(–) AIN(–) AIN(+) IOUT2 IOUT1 XTAL1 XTAL2 VDD DOUT/ RDY CS SCLK GND POWER SUPPLY 10 F 0.1 F CONTROLLER 32.768kHz CRYSTAL 6k 10k IN– OUT+ OUT– IN+ Figure 3. Basic Connection Diagram The output rate of the AD7783 (fADC) equals f ADC =¥ ¥ ¥ () 32 768 10 69 8 3 3 ./ while the settling time equals t f t SETTLE ADC ADC = Ê ËÁ ˆ ¯˜ =¥ 2 2 Normal-mode rejection is the major function of the digital filter on the AD7783. Simultaneous 50 Hz and 60 Hz rejection of better than 60 dB is achieved as notches are placed at both 50 Hz and 60 Hz. Figure 4 shows the filter rejection. FREQUENCY (Hz) 0 010 40 6080 100 –40 –80 –120 –140 –160 –20 –60 –100 20 30 50 70 90 OUTPUT DATA RATE = 19.8Hz INPUT BANDWIDTH = 4.74Hz 50Hz REJECTION = –66dB, 50Hz 1Hz REJECTION = –60dB 60Hz REJECTION = –117dB, 60Hz 1Hz REJECTION = –94dB Figure 4. Filter Profile (Filter Notches at Both 50 Hz and 60 Hz) 2.5 0 1.0 3.0 2.5 2.0 1.5 3.5 5.0 4.5 4.0 2.0 1.5 1.0 0.5 3.0 VREF (V) 160mV RANGE 2.56V RANGE VDD = 5V VREF = 2.5V TA = 25 C TPC 2. RMS Noise vs. Reference Input |
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