High-speed low-power ADCs draw just 222mW per channelApr 28 2005 - Semiconductors [More Semiconductors Articles]
A family of low-power high-speed dual ADCs, which provide -110dB crosstalk
for exceptional channel-to-channel isolation, while achieving extremely low
power consumption, has been launched by Linear Technology.
At just 445mW (c.222mW per channel) the 14-bit, 80Msps LTC2299 consumes less
power than slower competitors, says the company. The device is seen as ideal
for base station applications, achieving 73dB signal-to-noise ratio (SNR)
and 85dB spurious free dynamic range (SFDR) at 70MHz.
For higher intermediate frequencies (IFs), it excels with 72.6dB SNR and
80dB SFDR up to 140MHz. The LTC2299 is one of 14 new dual ADCs introduced as
part of the company´s expanding family of low-power, high-speed ADCs, which
range from 10Msps to 80Msps at 10-bit, 12-bit and 14-bit resolution .
In addition to base station applications, the low-power dual ADCs are well
suited for other communication systems and high-end medical imaging
The LTC2299´s small 9mm x 9mm QFN package make it ideal for low-power
single-carrier base stations where the matching performance of the in-phase
(I) and quadrature (Q) channels is critical. Crosstalk between channels
stays below -110dB from low input frequencies all the way up to 100MHz. The
system footprint of the LTC2299 is small since few external bypass
capacitors are needed. Optimised for undersampling with wide bandwidth, it
also suits multi-carrier base station designs that require multiple receive
channels in a small area. Pin-compatible versions at sample rates of 65Msps,
40Msps, 25Msps and 10Msps feature even lower power – as low as 60mW per
channel. Pin-compatible 12-bit and 10-bit versions at each speed are also in
full production, says the company.