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Current Input Analogue Front End with Digital Control and SPI Interface, TSMC 180nm
The Current Input Analogue Front End chip provides a silicon IP module and/or ASIC solution for the programmable analogue front-end (AFE) function, optimized for current-input, low power & high resolution applications. The Current Input Analogue Front End provides a complete signal path between sensor system and suitable analogue-to-digital converter, generating a fully differential output voltage proportional to the input current.
The Current Input Analogue Front End 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.
The Current Input Analogue Front End 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.
Features
- Detection and measurement of low input current from hundreds of pA to 1 mA |absolute value|
- Detection of small input current difference 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 12-bit resolution
- Low noise PGA (switched-capacitor architecture)
- Analogue output range: 1.3 Vp-p
- Single supply voltage: 1.6 V to 1.8 V
- Internal band-gap voltage reference: 1.0 V
- Internal voltage and current references
- User control over standard SPI interface
- Programmable clocking for PGA and S&H
- Power consumption: ~ 4.5 mW
- Operating temperature range: -40°C to 125°C
- Compact IP area: ~ 4 mm²
Benefits
- 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
- Single-ended current input with fully differential (FD) voltage output for further signal processing
Deliverables
- GDSII layout database
- Assembly guidelines and integration support
- Datasheet
- Behavioural VHDL model for SoC simulations
- Layout footprint
- Application notes
- VHDL code for synthesis
- On demand:
- LVS/SPICE netlist
- MATLAB model for effective system design
Block Diagram of the Current Input Analogue Front End with Digital Control and SPI Interface, TSMC 180nm
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