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New Signal Chain Resources from Texas Instruments:

Digital TV, Audio Boost Analog/Mixed-Signal

Innovation in the analog domain has never been stronger thanks to a series of new applications from the digital side.

Date Posted: June 08, 2006 12:00 AM
Author: Don Tuite

The 12-MHz, unity-gain bandwidth LMV654 quad amplifier requires significantly less power than equivalent competing chips, consuming 400 µA while maintaining a 12-MHz unity-gain bandwidth and a 17-nV/√Hz input-referred noise voltage. The LMV792's shutdown feature reduces power consumption to less than 1 µA in idle mode. The LMV796 and LMV797 fit applications in which system shutdown replaces localized shutdown requirements.

Among the other new VIP50-based chips, the LMP7712 dual amp offers low offset and noise as well as a 100-dB CMRR and PSRR.

The LMP7704 rail-to-rail quad precision amplifier eliminates the large offset glitch associated with conventional CMOS rail-to-rail input amplifiers. A patented correction technique reduces the large offset-voltage temperature coefficient commonly found in CMOS precision amplifiers. All nine op amps range from $0.75 to $2.49 in 1000-unit lots.

Operating down to 1.8 V, ADI's AD8500 rail-to-rail precision op amp looks to battery-powered applications like electrocardiograms, pulse monitors, glucose meters, smoke and fire detectors, security systems, gas detectors, backup battery sensors, insulin pumps, and ultraviolet detectors in cellular handsets.

It specifies a 1-µA maximum supply current while operating from a single +1.8- to +5.5-V supply or a ±0.9- to ±2.75-V dual supply. The low voltage makes it possible to use ordinary batteries over their full discharge profile. The chip guarantees a 1-mV max offset and 1-pA input bias, and it costs $0.70 each in 1000-piece lots.

Beyond amplifiers and converters, Maxim has introduced a truly analog quarter-size alternative for the ceramic resonators and crystals normally used in low-speed USB applications. The MAX7393/7394 fixed-frequency, non-phase-locked-loop precision silicon oscillators boast ±0.25% accuracy from 0°C to 85°C (±0.5% accuracy from ?45°C to 85°C).

Available for frequencies from 922 kHz to 48 MHz, they can be connected to any microcontroller without the need for impedance or capacitive matching. The MAX7393's auto-sense capability senses a microcontroller's oscillator circuit and enables itself when the microcontroller's oscillator turns on. The MAX7394 uses a simple enable pin. In shutdown mode, maximum current is 2 µA. Prices start at $0.40 in lots of 10,000 and up.

The 12-MHz, unity-gain bandwidth LMV654 quad amplifier requires significantly less power than equivalent competing chips, consuming 400 µA while maintaining a 12-MHz unity-gain bandwidth and a 17-nV/√Hz input-referred noise voltage. The LMV792's shutdown feature reduces power consumption to less than 1 µA in idle mode. The LMV796 and LMV797 fit applications in which system shutdown replaces localized shutdown requirements.

Among the other new VIP50-based chips, the LMP7712 dual amp offers low offset and noise as well as a 100-dB CMRR and PSRR.

The LMP7704 rail-to-rail quad precision amplifier eliminates the large offset glitch associated with conventional CMOS rail-to-rail input amplifiers. A patented correction technique reduces the large offset-voltage temperature coefficient commonly found in CMOS precision amplifiers. All nine op amps range from $0.75 to $2.49 in 1000-unit lots.

Operating down to 1.8 V, ADI's AD8500 rail-to-rail precision op amp looks to battery-powered applications like electrocardiograms, pulse monitors, glucose meters, smoke and fire detectors, security systems, gas detectors, backup battery sensors, insulin pumps, and ultraviolet detectors in cellular handsets.

It specifies a 1-µA maximum supply current while operating from a single +1.8- to +5.5-V supply or a ±0.9- to ±2.75-V dual supply. The low voltage makes it possible to use ordinary batteries over their full discharge profile. The chip guarantees a 1-mV max offset and 1-pA input bias, and it costs $0.70 each in 1000-piece lots.

Beyond amplifiers and converters, Maxim has introduced a truly analog quarter-size alternative for the ceramic resonators and crystals normally used in low-speed USB applications. The MAX7393/7394 fixed-frequency, non-phase-locked-loop precision silicon oscillators boast ±0.25% accuracy from 0°C to 85°C (±0.5% accuracy from ?45°C to 85°C).

Available for frequencies from 922 kHz to 48 MHz, they can be connected to any microcontroller without the need for impedance or capacitive matching. The MAX7393's auto-sense capability senses a microcontroller's oscillator circuit and enables itself when the microcontroller's oscillator turns on. The MAX7394 uses a simple enable pin. In shutdown mode, maximum current is 2 µA. Prices start at $0.40 in lots of 10,000 and up.

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