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CS5525 Datasheet(PDF) 8 Page - Cirrus Logic |
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CS5525 Datasheet(HTML) 8 Page - Cirrus Logic |
8 / 29 page CS5525 CS5526 8 DS202F3 DETAILED DESCRIPTION The CS5525 and CS5526 are 16-bit and 20-bit pin compatible converters which include a chopper- stabilized instrumentation amplifier input, and an on-chip programmable gain amplifier. They are both optimized for measuring low-level unipolar or bipolar signals in process control and medical ap- plications. The CS5525/26 also include a fourth order delta- sigma modulator, a calibration microcontroller, eight digital filters, a 4-bit analog latch, and a serial port. The digital filters provide any one of eight different output update rates. The CS5525/26 include a CPD (Charge Pump Drive) output (shown in Figure 1). CPD provides a negative bias voltage to the on-chip instrumenta- tion amplifier when used with a combination of ex- ternal diodes and capacitors. This enables the CS5525/26 to measure negative voltages with re- spect to ground, making the converters ideal for thermocouple temperature measurements. Theory of Operation The CS5525/26 A/D converters are designed to op- erate from a single +5 V analog supply and provide several different input ranges. See the Analog Characteristics section on page 3 for details. Figure 1 illustrates the CS5525/26 connected to generate their own negative bias supply using the on-chip CPD (Charge Pump Drive). This enables the CS5525/26 to measure ground referenced sig- nals with magnitudes down to NBV (Negative Bias Voltage, approximately -2.1 V in this example). Figure 2 illustrates a charge pump circuit when the converters are powered from a +3.0 V digital sup- ply. Alternatively, the negative bias supply can be generated from a negative supply voltage or a resis- tive divider as illustrated in Figure 3. XO U T VD + VA + VR E F + VR EF - DG N D NB V AIN + SC LK SD O SD I C S 552 5 XIN CP D CS 10 Ω +5V An alo g Su pp ly 0.1 µ F0 .1 µF 20 19 3 1 AG N D 213 11 14 17 18 12 5 Se ria l Data In te rfa ce 8 2.5V U p to ± 1 0 0 m V In p u t AIN - 4 10 k Ω 0.1 µ F N o te : C old-junc tion m eas urem en t is perform ed by a s ec ond A /D o r v ia a m u ltip le x e r. 10 µ F 0.015 µ F 1N 4 148 1N 4 148 + BAV1 9 9 16 A3 15 A2 7 A1 6 A0 C harge-pum p n etw o rk fo r V D + = 5 V o n ly a n d X IN = 32.768 k H z . C S 55 26 *5M Ω * O p tional, s ee C harge P u m p D riv e s ec tion. L ogic O utputs : A0 - A 3 S w itc h fro m V A+ to AG N D . 10 k Ω 10 9 O p tional Clo c k S ourc e 32 .76 8 ~ 100 kH z 20 pF 50 0k Ω Figure 1. CS5525/26 Configured to use on-chip charge pump to supply NBV. |
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