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CS5526-BP Datasheet(PDF) 8 Page - Cirrus Logic |
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CS5526-BP Datasheet(HTML) 8 Page - Cirrus Logic |
8 / 30 page CS5525 CS5526 8 DS202F5 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. Figure 1. CS5525/26 Configured to use on-chip charge pump to supply NBV. |
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