Zarlink Semiconductor expanded its high-performance analog portfolio with two operational amplifier chips that amplify broadband signals with unmatched clarity and precision. The ZLTM40162/166 chips also deliver the lowest standby (quiescent) current rating in their class.
Operational amplifiers are analog chips that deliver high gain by boosting signal amplitudes by large margins. The devices are used to amplify, buffer, filter, and condition signals in a broad range of electronic equipment, including video, audio, and networking systems. In most operational amplifiers, key performance characteristics such as output drive, speed, linearity, and power efficiency are tuned to meet the requirements of specific applications.
Zarlink's ZL40162/166 chips are dual-matched voltage-feedback amplifiers with large output drive currents typically more than 200 mA (milliamps). The chips also display exceptional ratings for linearity, power consumption, and surge protection, making them well suited for driving broadband signals in DSL (digital subscriber line) modems and video equipment.
"DSL modems, commercial video systems, and professional video equipment require operational amplifiers that deliver a challenging mix of high-performance capabilities," said Peter Minett, product line marketing manager, High-Performance Analog group, Zarlink Semiconductor. "Our ZL40162/66 devices meet this need by providing industry-leading combinations of drive, linearity, and bandwidth."
Both of Zarlink's new amps are built in the company's world-class HJV (high-performance, process version J, high-voltage) process, a complementary silicon bipolar technology that maximizes performance in high-voltage, high-speed analog devices.
The ZL40162 amp is optimized for line-driver circuitry in DSL modems. The ZL40166 amp is designed for video amplification circuits in high-quality video equipment. Both devices are also suitable for other types of signal conditioning circuits, including active filters, group delays, and ADCs (analog-to-digital converters).
Zarlink's ZL40162/166 devices are high-voltage, high-speed operational amplifiers with peak-to-peak output drives of up to 9.4 V (volts) in circuits with single-ended outputs, and up to 18.8 V in circuits with differential outputs. The amps have slew rates, or operating signal edge speeds, of 195 V per microsecond.
The chips employ innovative circuit techniques to minimize current consumption. In standby mode, they draw only 7 mA/A (milliamps per amp) the industry's leading rating in this high-performance category of voltage-feedback amp.
The ZL40162/166 devices deliver excellent combinations of gain and bandwidth, allowing designers to build highly linear, closed loop amplification circuits. In closed loop configurations with a gain of 2, while driving a 25-ohm load, the ZL40162/166 achieve bandwidths of 160 MHz (megahertz) and 190 MHz, respectively.
The chips also post best-in-class ratings in three key ratios that measure their ability to minimize distortion, noise, and coupling the MTPR (multi-tone power ratio), CMRR (common mode rejection ratio), and PSRR (power supply rejection ratio). This makes them highly suitable for multi-carrier transmission systems such as DSL modems.
The MTPR rating is -70 dBC (decibels referenced to carrier) when the chips are delivering +13 dBm (decibels referenced to milliwatts) into a 1:2 transformer driving a 100-ohm balanced telephone line. At 10 KHz (kilohertz), the CMRR and PSRR of the chips are 79 dB (decibels) and 81 dB, respectively.
Broadcast-quality differential gain and phase
The ZL40162/166 amps also have excellent margins for differential gain and phase, important characteristics for applications in high-grade video equipment. The ratings of the ZL40166 device exceed requirements for broadcast-quality systems. In a closed loop with a gain of 2, the differential gain of the ZL40166 is only 0.005%, the lowest in its class. In the same configuration, the differential phase of the ZL40166 amp is -0.07 degrees.
Zarlink's new analog amps have robust stress and surge tolerance. Supply and output pins withstand more than 4 KV (kilovolts) of ESD (electro-static discharge), and input pins more than 1.2 KV. All pins pass the JEDEC (Joint Electronic Device Engineering Council) latch-up test of +/- 100 mA for 100 ms (millisecond). This surge-tolerant performance saves designers board space by minimizing the need for external protection components.
For almost 30 years, Zarlink Semiconductor has delivered semiconductor solutions that drive the capabilities of voice, enterprise, broadband and wireless communications. The company's success is built on its technology strengths including voice and data networks, consumer and ultra low power communications, and high-performance analog.