LH0002 datasheet National Semiconductor, Texas Instruments

LH0033LH0063

Fast and Ultra Fast Buffers

The LH0033 and LH0063 are high speed FET input voltage follower/buffers designed to provide high current drive at frequencies from DC to over 100 MHz The LH0033 will provide ±10 mA into 1 kΩ loads (±100 mA peak) at slew rates of 1500 V/µs. The LH0063 will provide ±250 mA into 50X loads (±500 mA peak) at slew rates up to 6000 V/µs. In addition both exhibit excellent phase linearity up to 20 MHz.

Both are intended to fulfill a wide range of buffer applications such as high speed line drivers video impedance transformation nuclear instrumentation amplifiers op amp isolation buffers for driving reactive loads and high impedance input buffers for high speed A to Ds and comparators.

In addition the LH0063 can continuously drive 50X coaxial cables or be used as a yoke driver for high resolution CRT displays For additional applications information see AN-48. These devices are constructed using specially selected junction FETs and active laser trimming to achieve guaranteed performance specifications. The LH0033 is specified for operation from -55 °C to +125 °C the LH0033C and the LH0063C are specified from -25 °C to +85 °C. The LH0033 is available in either a 1.5 W metal TO-8 package or an 8-pin ceramic dual-in-line package. The LH0063 is available in a 5 W 8-pin TO-3 package.

Features

• Ultra fast (LH0063) 6000 V/µs
• Wide range single or dual supply operation
• Wide power bandwidth DC to 100 MHz
• High output drive ±10V with 50Ω load
• Low phase non-linearity 2 degrees
• Fast rise times 2 ns
• High input resistance 10¹⁰Ω

Advantages

• Only 10V supply needed for 5 Vp-p video out
• Speed does not degrade system performance
• Wide data rate range for phase encoded systems

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Features

• Complete Stereo DAC System

8´ Interpolation Filter

64´ Delta-Sigma DAC

Analog Post Filter

• Adjustable System Sampling Rates including 32kHz, 44.1kHz & 48kHz

• 120 dB Signal-to-Noise Ratio
• Low Clock Jitter Sensitivity
• Completely Filtered Line-Level Outputs

Linear Phase Filtering

Zero Phase Error Between Channels

No External Components Needed

• Flexible Serial Interface for Either 16 or 18 bit Input Data

General Description

The CS4328 is a complete stereo digital-to-analog output system. In addition to the traditional D/A function, the CS4328 includes an 8´ digital interpolation filter followed by a 64´ oversampled delta-sigma modulator.

The modulator output controls the reference voltage input to an ultra-linear analog low-pass filter. This architecture allows for infinite adjustment of sample rate between 1 kHz and 50 kHz while maintaining linear phase response simply by changing the master clock frequency.

The CS4328 also includes an extremely flexible serial port utilizing two select pins to support four different interface modes.

The master clock can be either 256 or 384 times the input word rate, supporting various audio environments.