Low cost multimedia op amps

A low cost quad op amp that is suitable for multimedia applications has been introduced by SGS-THOMSON Microelectronics. Known as the TSH94, the new device is built with an advanced BiCMOS process that delivers very high performance at a very attractive price. In addition, two of the op amps can be placed independently in a standby mode where current consumption of the disabled amplifier is reduced to a very low value and the output is switched to a high impedance state.

Among the features that make the TSH94 suitable for demanding video applications are the high speed and the high linearity. Key parameters include 150MHz bandwidth, 0.07 differential phase, 0.03% differential gain and 0.1dB maximum gain flatness at 6MHz. At the same time, a low noise figure of 4.2nV/ Hz, a high slew rate of typically 110V/ás and a total harmonic distortion (at 1KHz) of only 0.01% make the device suitable for high quality audio applications.

The TSH94 offers an excellent speed/power ratio, with a typical current consumption of 4.5mA per op amp for 150MHz bandwidth. The ability to selectively enable or disable two of the amps via fast acting (200ns switching time) MOS inputs allows these devices to be used in applications such as signal multiplexing and video line transceivers.

The TSH94 uses conventional voltage feedback op amps with low offset voltage, low input current and balanced inputs, so that no special knowledge is required to achieve their full performance potential. The outputs are specified for both 600 and 150 loads, making the devices suitable for a wide range of applications including satellite receivers, pay TV, audio equipment and industrial instrumentation.

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