Cirrus Logic CS5521-ASZ

The CS5521/22/23/24/28 are highly integrated ΔΣ analog-to-digital converters (ADCs) which use charge-balance techniques to achieve 16-bit (CS5521/23) and 24-bit (CS5522/24/28) performance. The ADCs 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, 1 V, 2.5 V, and 5 V, the ADCs 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 ΔΣ 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 Sps, they reject both 50 Hz and 60 Hz interference. These single-supply products are ideal solutions for measuring isolated and non-isolated, low-level signals in process control applications.

• Low Input Current (100 pA), Chopper-stabilized Instrumentation Amplifier
• Scalable Input Span (Bipolar/Unipolar) - 2.5V VREF: 25 mV, 55 mV, 100 mV, 1 V, 2.5 V, 5 V - External: 10 V, 100 V
• Wide VREF Input Range (+1 to +5 V)
• Fourth Order Delta-Sigma A/D Converter
• Easy to Use Three-wire Serial Interface Port - Programmable/Auto 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 Sps (XIN = 200 kHz) - Single Conversion Settling - 50/60 Hz ±3 Hz Simultaneous Rejection
• Single +5 V Power Supply Operation - Charge Pump Drive for Negative Supply - +3 to +5 V Digital Supply Operation
• Low Power Consumption: 6.0 mW