SC-I-AFE-180F210 and F209

Product Brief


SC-I-AFE-180F210  PDF    Current-Input Analogue Front End with SPI Interface
SC-IC-AFE-180F209  PDF  Current-Input Analogue Front End – Core

Note:
SC-IC-AFE-180F209 does not contain the block "Digital Control over SPI Interface" which is usually the part of overall SoC solution. This block is incorporated in SC-I-AFE-180F210. 


The path from the real world to the digital word

The SC-I-AFE-180F210 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. This chip 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.

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.

SC-I-AFE-180F210 – Functional block diagram

Key Features

  • Detection and measurement of low input current
    from hundreds of pA to 1 mA |absolute value|
  • Detection of small input current difference (ΔI)
    on the level of hundreds of pA
  • Overall gain up to 1296 (programmable gains 1, 3, 6)
  • High linearity: < 0.5 LSB per gain stage for 13-bit resolution (±1.3 V dynamic range)
  • 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: ~ 4.3 mW (F209), ~5 mW (F210)
  • Operating temperature range: -40°C to 125°C
  • Compact IP area: ~ 3.7 mm2 (F209), ~ 4 mm2 (F210)

Technology

  • Silicon validated IP module: TSMC 180nm 1P6M mixed signal (SC-I-AFE-180F209 only)

Customization Offer

The customization is open to the potential customers on demand. The key emphasis is to meet the system developers' needs in a way to allow quick customization and/or optimization either for the specific sensor system or application.

Flexible re-configurations of the built-in functions are enabled because of the modular design and our original circuit solutions (some features could be changed). Customization of current design or new circuits with additional features, depending on the specific application requirements, are as follows:

  • Customisable current ranges on demand, for instance:
    - high current detection up to 10 mA (for the industrial applications)
  • Rearrangement of the PGA gain
  • Adjustment of AFE's output to match ADC input from another vendor
  • Digital control for battery-saving low-power modes
  • Strict consumption (power-down) control
  • Possibility to detect input voltages instead of input currents, or both
  • Ability to upgrade into multi-channel input, etc.

Advantages on the Chip Level

Features which make the difference, worthy to be highlighted:

  • Direct interface to the sensor system
  • Stable internal voltage and current references with only one external component (resistor @ 100 kohms)
  • Highly linear current-to-voltage conversion achieved by using Transimpendance Amplifier (TIA) architecture
  • Special circuit for current management and biasing of PiN diode in auto-zero mode
  • Effective offset cancellation throughout the signal path
  • Single-ended current input with fully differential (FD) voltage output for further signal processing
  • Low power consumption ideally suited for battery-powered operation; each block has built-in power-down ability that enables effective power management
  • Built-in guard rings for the noise isolation
  • Carefully done layout, following circuit design, with special emphasis on matching
  • Fully functional temperature range: from -40°C to 125°C, under investigation up to 180°C

 

Important:

Your information about either purchasing or customization interest is very welcome!

Please send it to: afe@systemcom.hr