Linear unveils dual IR/baseband receiver subsystem
Linear Technology
Dual IR/baseband receiver subsystem
Linear Technology has introduced the LTM9002 dual infrared (IR)/baseband receiver subsystem.
The LTM9002 includes a dual 14-bit analogue-to-digital converter (ADC) sampling up to 125Msps, anti-aliasing filters, fixed gain differential ADC drivers and 12-bit trim digital-to-analogue converters (DACs).
The integrated receiver reduces the board space and development time for wireless base stations implementing I/Q receivers, direct conversion receivers or multi-channel configurations including diversity receivers.
The LTM9002 comes in an 11.25 x 15mm Umodule package.
Hands-on applications experience is a prerequisite for any designer hoping to take full advantage of an ADC's capabilities when sampling high-dynamic-range signals in high-speed communications receivers, communications test equipment or instrumentation, according to the company.
Multi-channel applications have several requirements, such as channel matching and channel-to-channel isolation.
The LTM9002 provides the optimal connection between the radio-frequency and digital domains.
Designers no longer need to perform the time-consuming tasks of component selection, input impedance matching, filter design and layout.
At the same time, the long hours of troubleshooting are eliminated, meaning a reduced time to market.
For multi-channel applications, channel-to-channel matching and isolation are important considerations.
The LTM9002 achieves 90dB isolation at 140MHz input frequency, despite the small form factor.
The overall gain is typically 26dB and varies less than 0.1dB between the two channels.
A dual 12-bit auxiliary DAC offers the flexibility to adjust the span and balance the two channels using an SPI-compatible serial port.
The LTM9002 is packaged in an LGA package, utilising a multi-layer substrate that shields sensitive analogue lines from the digital traces to minimise digital feedback.
Supply and reference bypass capacitance is placed inside the module tightly coupled to the die.
With no external capacitance required, the LTM9002 consumes approximately one fourth of the space of the discrete implementation, according to Linear Technology.
The LTM9002 is available now in production volumes.
Pricing is USD99.25 (GBP60) each in 1,000-piece quantities.
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