National Semiconductor has announced two new amplifiers that are optimised for driving two new high-speed ADCs. The two high-speed, low-distortion differential amplifiers (LMH6550 and LMH6551) and two high-speed, low-power, 12-bit ADCs (ADC12DL040 and ADC12DL065) form a high-performance, high-fidelity and low-power signal-path solution.
The analog signal path is the heart of demanding applications such as ultrasound imaging and communications systems. Signal fidelity is determined primarily by the quality of the amplifiers and ADCs. In ultrasound systems, for example, high-fidelity signals provide superior imaging and more accurate diagnostics. In communications systems such as cellular base stations, the benefits are clearer reception and fewer dropped calls.
"Engineers are increasingly demanding the highest possible accuracy for real-world analog signal capture at the lowest possible power consumption," said Suneil Parulekar, senior vice president of National Semiconductor's Analog Products Group. "National's new combination of high-performance amplifiers and ADCs provides the most accurate signal capture at the lowest power consumption."
The LMH6550 and the ADC12DL040 operate seamlessly to provide a high-quality signal-path solution. According to National, lab measurements show that the pair produces 11,1 effective number of bits (ENOB) and 80 dB of spurious free dynamic range (SFDR) with a 20 MHz input frequency.
The ADC12DL040 and ADC12DL065 are dual, ADCs capable of converting analog input signals into 12-bit digital words at 40 and 65 Msps respectively. They operate on a single 3 V power supply and come in TQFP-64 package.
The LMH6550 and LMH6551 are fully differential, high-speed amplifiers in SOIC-8 packaging, designed for driving 10- to 14-bit, high-performance ADCs such as the ADC12DL040 and ADC12DL065. Both amplifiers have fully differential voltage feedback topology, which allows balanced inputs to ADCs, and they can be used either as single-ended-to-differential or as differential-to-differential amplifiers. The LMH6550 operates at +5 V or ±5 V supply, and the LMH6551 operates at +3 V, +5 V or ±5 V supply voltages.
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