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Current Input Analogue Front End with 13-bit ADC, TSMC 180nm

The SC-I-AFE-180F110 chip provides a silicon IP module and/or ASIC solution for the analogue front-end (AFE) function with 13-bit ADC, optimized for current-input, low power & high resolution applications. This chip provides a complete signal path between sensor system and microcontroller, generating digital word proportional to the input current.

It is ideally suited for a broad range of devices with the sensor system where the generic information about the phenomenon to be measured - light or other physical or chemical or electrochemical appearance - passes the first electrical conversion to the current. The IP implementation enables easy further System on Chip (SoC) integration of follow up functions.

特色

Detection and measurement of low input current from hundreds of pA to 1 mA |absolute value| (up to 90dB dynamic range)
Detection and measurement of small input current difference (dI) on the level of tens of pA
Overall gain up to 1296 (programmable gains 1,3,6)
High linearity: < 0.5 LSB per gain stage for 13-bit resolution
Low noise PGA (switched-capacitor architecture)
13-bit ADC with built-in self-calibration and offset cancellation
ADC’s INL < 0.7 LSB (13-bit resolution)
Built in FIFO for fast consecutive measurements (depth 8, 16 bit)
Single supply voltage: 1.6 V to 1.8 V
Internal band-gap voltage reference: 1.0 V
User control over standard SPI interface
Programmable clocking for PGA and S&H
Power consumption: ~ 5.1 mW
Operating temperature range: -40°C to 125°C
Compact IP area: ~ 5.8 mm²

优势

Direct interface to the sensor system
Detection and measurement of low input current in the range of hundred of picoA, well suited for biosensors, photosensors, LED and PIN diodes
Special circuit for current management and biasing of PiN diode in auto-zero mode
Highly linear current-to-voltage conversion achieved by using Transimpendance Amplifier (TIA) architecture
Effective offset cancellation throughout the signal path
Embedded highly linear, low-power 13-bit ADC with programmable resolution and programmable sampling rate