Product category: Analogue and Mixed Signal ICs
News Release from: National Semiconductor | Subject: LMH6550 and LMH6551
Edited by the Electronicstalk Editorial Team on 30 March 2005
Differential amplifiers provide fast
signal paths
Latest differential amplifiers provide high-speed analogue signal-path systems for test and measurement, medical imaging and communications applications.
National Semiconductor has two new high-speed, low-distortion differential amplifiers and two high-speed, low-power, 12bit analogue-to-digital convertors (ADCs) that form a high-performance, high-fidelity and low-power signal-path solution National's LMH6550 and LMH6551 amplifiers are optimised for driving high-speed ADCs such as the new 12-bit ADC12DL040 and ADC12DL065
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
Related stories
Dual-port Gigabit Ethernet transceiver
National Semiconductor has announced the DP83862, a low-cost, highly integrated dual-port 10/100/1000 physical layer transceiver.
World's smallest multifunction supervisory ICs
National Semiconductor has announced a family of supervisory ICs with a variety of factory-programmable features that can be configured in hundreds of possible combinations.
The analogue 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.
Further reading
Leadless leadframe package shrinks LDO
National Semiconductor has introduced a full-featured 500mA LDO regulator for medium-current applications in computing devices and portable products.
Boomer shrinks stereo headphone amplification
New from National Semiconductor, the LM4811 Boomer audio amplifier is a 105mW stereo headphone amplifier for use in 3 and 5V systems requiring a headphone output and volume control.
Frugal dual-channel A/D conversion
National Semiconductor has introduced a dual-channel 8bit A/D convertor with record low-power dissipation levels.
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 analogue 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".
Engineers who want to learn more about signal-path design may attend National's Signal Path seminars, which are being held in cities throughout Europe and the USA from 4th April to 20th May 2005.
Participants can register for the free, day-long events online.
The LMH6550 and the ADC12DL040 operate seamlessly to provide a high-quality signal-path solution.
Lab measurements show that the pair produces 11.1 effective number of bits (ENOB) and 80dB of spurious free dynamic range (SFDR) with a 20MHz input frequency.
With this guaranteed performance, engineers can confidently implement National's signal-path solutions in their designs.
The ADC12DL040 and ADC12DL065 are dual, high-performance, low-power ADCs capable of converting analogue input signals into 12bit digital words at 40 and 65Msample/s, respectively.
These ADCs provide excellent dynamic performance and 250MHz full-power bandwidth.
Operating on a single 3V power supply, the ADC12DL040 achieves 11.1ENOB with input signals up to 20MHz and consumes just 210mW at 40Msample/s.
The ADC12DL065 achieves 11.0ENOB with input signals up to 32.5MHz and consumes 360mW at 65Msample/s.
National recently introduced two other 12bit ADCs, the dual, 66Msample/s ADC12DL066 and the single, 80Msample/s ADC12L080, which are also optimised for signal-path applications.
The LMH6550 and LMH6551 are fully differential, high-speed amplifiers designed for driving 10 to 14bit, 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 has SFDR of -86dBc at 10MHz, wide 400MHz bandwidth and high 3000V/us slew rates.
It also has a 10ns shutdown/disable function and operates at +5 or +/-5V supply voltages.
The LMH6551 has SFDR of -85dBc at 10MHz, wide 370MHz bandwidth and high 2400V/us slew rates.
It also has an output balance error of -70dB and operates at +3, +5 or +/-5V supply voltages.
The LMH6550 and LMH6551, available now in SOIC-8 packaging, are priced at $2.29 and $1.60, respectively, in 1000-unit quantities.
The ADC12DL040, available now in a TQFP-64 package, is priced at $15 in 1,000-unit quantities.
The ADC12DL065, available in April and packaged in a TQFP-64, will be priced at $17 in 1000 unit quantities.
Lead-free package options are also available.
• National Semiconductor: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
