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CDB5528 Datasheet(PDF) 8 Page - Cirrus Logic |
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CDB5528 Datasheet(HTML) 8 Page - Cirrus Logic |
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8 / 28 page  CDB5521/22/23/24/28 8 DS317DB2 1.3 Using the Evaluation Board The CS5521/22/23/24/28 are highly integrated ADCs. They contain a multiplexer, an instrumenta- tion amplifier (IA), a programmable gain amplifier (PGA), an on-chip charge pump drive (CPD), and programmable output word rates (OWR). The IA provides a set gain of 20 while the PGA sets the in- put levels of the ADC at either 25 mV, 55 mV, 100 mV, 1 V, 2.5 V, or 5 V (for VREF = 2.5 V). The CPD provides a square wave output. This out- put, along with two diodes and two capacitors, is used to supply the negative supply to the IA, en- abling measurements of ground referenced signals. The ADC’s digital filter allows the user to select output word rates (OWR’s) from 1.88 Hz up to 101 Hz. higher output word rates can be attained when a faster clock source is used. Since the CS5521/22/23/24/28 have such a high degree of in- tegration and flexibility, the CS5521/23 or CS5522/24/28 data sheet should be read thorough- ly before and consulted during the use of the CDB5521/22/23/24/28. Table 1 lists the different headers on the CDB5521/22/23/24/28 and their functions. The locations of these headers are marked on the top of the board, and the silkscreen and layout of the board can also be found at the end of this document in Figures 12, 13, and 14 for ref- erence. 1.4. Power Connections Figure 4 illustrates the power supply connections to the evaluation board. The +5 V Analog supplies the analog section of the evaluation board, the LT1019 and the ADC. The -5 V Analog supplies the nega- tive bias voltage circuitry. The +5 V Digital sup- plies a separate five volts to the digital section of the evaluation board, the 80C51, the reset circuitry, and the RS-232 interface circuitry. 1.5 Negative Bias Voltage The evaluation board provides three means of sup- plying the Negative Bias Voltage (NBV). HDR4 (Header 4) selects between them. When HRD4 is in position one, the LM337 supplies NBV with an ad- justable voltage. R16 is used to adjust this voltage between -1.25 V and -5 V. When in position two, HDR4 grounds NBV. And by setting HDR4 to po- sition three, the converter’s Charge Pump Drive provides NBV with a dc rectified voltage, nominal- ly -2.1 V. Note: NBV should not exceed a voltage more negative than -3.0 V. +5V Analog -5V Analog Z3 P6KE6V8P + C8 47µF C13 0.1µF Z1 P6KE6V8P + C5 47µF C10 0.1µF +5V Digital Z2 P6KE6V8P + C6 47µF C12 0.1µF +5V Analog -5V Analog +5V Digital AGND DGND Figure 4. Power Supplies |
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