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TI monitoring IC replaces up to five discrete components

Posted: 30 Apr 2002 ?? ?Print Version ?Bookmark and Share

Keywords:amc7820? burr brown? dwdm monitoring ic? controller ic? optical power monitoring?

The AMC7820 analog monitoring and control circuit from Texas Instruments Inc. replaces up to five discrete components, allowing the IC to be used in multi-channel application that require small sized components such as pump laser current and thermoelectric cooler (TEC) control in optical amplifiers, as well as optical power monitoring in DWDM applications.

A member of the Burr-Brown product line, the AMC7820 is shipped in TQFP-48 package and integrates an 8-channel 12-bit ADC, three 12-bit DACs, nine operational amplifiers, a thermistor current source, an internal 2.5V reference, and an SPI serial interface.

The AMC7820's ADC monitors up to eight analog signals (100kSa/s), while the three DACs can be used to implement DSP-based or microcontroller-based digital setting and control. The operational amplifier can be configured for analog signal conditioning and control, while the current source is designed to drive external thermistor or other temperature sensors.

For DWDM applications, the chip can control one laser diode and one TEC, or either two laser diodes or two TECs. When configuring the operational amplifiers as transimpedance amplifiers, the AMC7820 works as an optical power monitor to detect up to eight optical channels.

The device dissipates 40mW (typ.) and can also be used as a multiple analog channel monitor and controller.

For the ADC, the unbuffered analog input range is from 0V to 5V, while the buffered analog common-mode input range is from 0V to 3.8V. The DACs provide an analog output range of 0V to 2.5V or 0V to 5V.

The AMC7820 is priced at $9.15 in 1,000-piece quantities.





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