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The CS5521/22/23/24/28 are highly integrated, Delta-Sigma analog-to-digital converters (ADCs) which use charge-balance techniques to achieve 16-bit (CS5521/23) and 24-bit (CS5522/24/28) performance. The A/D converters come as either two-channel (CS5521/22), four-channel (CS5523/24), or eight-channel (CS5528) devices, and include a low input current, chopper-stabilized, instrumentation amplifier. To permit selectable input spans of 25 mV, 55 mV, 100 mV, 1V, 2.5V, and 5V; the A/D converters include a PGA (programmable gain amplifier). To accommodate ground-based thermocouple applications, the devices include a charge pump drive which provides a negative bias voltage to the on-chip amplifiers. These devices also include a fourth-order Delta-Sigma modulator followed by a digital filter which provides eight selectable output word rates. The digital filters are designed to settle to full accuracy within one conversion cycle and when operated at word rates below 30 Hz, they reject both 50 and 60 Hz interference. These single supply products are ideal solutions for measuring isolated and non-isolated, low-level signals in process control applications.
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- Low input current (100 pA) and chopper stabilized instrumentation amplifier
- Scalable input span (bipolar/unipolar)
- 2.5V VREF: 25 mV, 55 mV, 100 mV, 1V, 2.5V, 5V
- External: 10V, 100V
- Wide VREF input range (1 to 5V)
- 4th-order Delta-Sigma A/D converter
- Easy-to-use three-wire serial interface port
- Channel sequencer with conversion data FIFO
- Accessible calibration registers per channel
- Compatible with SPI and Microwire™
- System and self-calibration
- Eight selectable word rates
- Up to 617 Hz (XIN = 200 kHz)
- Single conversion settling
- 50/60 Hz ±3 Hz simultaneous rejection
- Single 3 to 5V digital power supply operation
- Charge pump drive for negative supply
- Low power consumption: 5.5 mW
- Package: 20/24-pin SSOP, 20/24-pin PDIP
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