Linear Technology releases LT5554 amplifier
Linear Technology
LT5554 amplifier
Linear Technology has introduced the LT5554: a broadband digitally programmable gain IF amplifier, featuring a 48dBm OIP3 (output 3rd order intercept) at 200MHz.
Additionally, the amplifier has very low noise, enabling high dynamic range performance in wireless communication receivers and signal processing systems.
Its gain is digitally controlled from 2dB to 18dB by a 7-bit parallel word, producing 0.125dB steps gain control granularity.
The amplifier settles in less than 5ns from a gain change, producing low glitch noise and supporting very fast and accurate automatic gain control (AGC) performance.
Its output stage has a robust capability to drive into 50ohm loads with low distortion and noise.
As a result, it enables high spurious-free dynamic range performance in ADC systems.
The LT5554's OIP3 performance remains consistently high over a wide varying signal level range.
In contrast, the closest competing solution is limited to only a narrow +/-1dB signal level range.
With today's generation of wireless technology, such as long-term evolution (LTE) and Wimax, which use modulated signals with a 12dB crest factor, the need to maintain linearity performance over wide operating levels is paramount for producing consistent base-station performance, according to the company.
Additionally, the LT5554, a full differential input and output amplifier, has a gain accuracy of +/-0.1dB from -40C to +85C.
Its differential outputs can drive directly into 50ohm loads.
The amplifier may be overdriven and can recover in less than 5ns.
Additionally, the amplifier is claimed to have excellent reverse isolation.
These characteristics make the LT5554 a suitable amplifier to drive high-speed, high-resolution A/D converters where the input sampling noise can couple back to the RF and IF circuits.
The LT5554 is powered from a single 5V supply.
It draws a nominal supply current of 200mA.
The chip can be shut down via an Enable pin.
When in shutdown, the device draws a typical supply current of 4mA and a maximum of 5.1mA.
The device comes in a 32-lead, 5mm x 5mm plastic QFN surface-mount package.
Prices for the LT5554 start at USD4.40 (GBP2.69) each in 1,000-piece quantities.
The LT5554 is available immediately from stock.
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