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The CS5501 and CS5503 are low-cost CMOS analog-to-digital (A/D) converters ideal for measuring low-frequency signals representing physical, chemical and biological processes. They utilize charge-balance techniques to achieve 16-bit (CS5501) and 20-bit (CS5503) performance with up to 4 kHz word rates. The converters continuously sample at a user-set rate to a CMOS clock or crystal. On-chip digital filtering processes the data and updates the output register at up to 4 kHz. The converters’ low-pass, 6-pole Gaussian response filter is designed to allow corner frequency settings from 0.1 Hz to 10 Hz in the CS5501 and 0.5 Hz to 10 Hz in the CS5503. Thus, each converter rejects 50 Hz and 60 Hz line frequencies as well as noise at spurious frequencies. The CS5501 and CS5503 include on-chip self-calibration circuitry, which can be initiated at any time or temperature to ensure offset and full-scale errors of typically less than 1/2 LSB for the CS5501 and less than 4 LSB for the CS5503. The devices can also be applied in system calibration schemes to null offset and gain errors in the input channel. Each device’s serial port offers two general-purpose modes of operation for direct interface to shift registers or synchronous serial ports of industry-standard microcontrollers. In addition, the serial port on the CS5501 offers a third, UART-compatible mode of asynchronous communication. |
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| Resolution (bits) | Throughput (Sps) | Integral Linearity (%FS) | Differential Linearity (±LSB) | Number of Channels | Power Consumption (mW) | Package |
|---|---|---|---|---|---|---|
| CS5501 | ||||||
| 16 | 4000 | 0.0015 % | 0.125 | 1 | 25 | 20 PDIP 20 SOIC |
| CS5503 | ||||||
| 20 | 4000 | 0.0015 % | NMC | 1 | 25 | 20 PDIP 20 SOIC |
The CS5501 and CS5503 are low-cost CMOS analog-to-digital (A/D) converters ideal for measuring low-frequency signals representing physical, chemical and biological processes. They utilize charge-balance techniques to achieve 16-bit (CS5501) and 20-bit (CS5503) performance with up to 4 kHz word rates.
The converters continuously sample at a user-set rate to a CMOS clock or crystal. On-chip digital filtering processes the data and updates the output register at up to 4 kHz. The converters’ low-pass, 6-pole Gaussian response filter is designed to allow corner frequency settings from 0.1 Hz to 10 Hz in the CS5501 and 0.5 Hz to 10 Hz in the CS5503. Thus, each converter rejects 50 Hz and 60 Hz line frequencies as well as noise at spurious frequencies.
The CS5501 and CS5503 include on-chip self-calibration circuitry, which can be initiated at any time or temperature to ensure offset and full-scale errors of typically less than 1/2 LSB for the CS5501 and less than 4 LSB for the CS5503. The devices can also be applied in system calibration schemes to null offset and gain errors in the input channel. Each device’s serial port offers two general-purpose modes of operation for direct interface to shift registers or synchronous serial ports of industry-standard microcontrollers. In addition, the serial port on the CS5501 offers a third, UART-compatible mode of asynchronous communication.
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