THAT1570

FEATURES y Low Noise: 1 nV/√Hz input noise (60 dB gain) y Low THD+N: 0.0003% ≤ 30 dB gain 0.0008% @ 40 dB gain y Low Current: 7.5 mA typ y Wide Bandwidth: 4.2MHz @40dB gain y High Slew Rate: 53 V/μs y Wide Signal Swing: >28.7dBu (±18V supplies) y Gain adjustable from 0 to >60 dB y Differential output y Small 4 x 4mm QFN16 package y Mates with THAT5171 Digital Preamplifier Controller IC Low-Noise, Differential Audio Preamplifier IC THAT1570 APPLICATIONS y Microphone Preamplifiers y Digitally-Controlled Microphone Preamplifiers y Differential Low-Noise Preamplifiers y Differential Summing Amplifiers y Differential Variable-Gain Amplifiers y Moving-Coil Transducer Amplifiers y Line Input Stages y Audio y Sonar y Instrumentation Description The THAT1570 is a versatile, high performance current-feedback amplifier suitable for differential microphone preamp and bus summing applications. The IC comes in a small QFN package, which saves PCB space over discrete and other integrated solutions. Gain is adjusted via three external resistors (RA, RB, and RG), making it possible to optimize noise over a wide range of gains. The 1570 supports the traditional approach to gain control (viz., THAT's 1510 or 1512) by fixing RA and RB, and varying RG to control gain. However, the 1570 also supports varying all three resistors simultaneously with a dual-gang potentiometer or a switched resistor network. This flexible approach enables the designer to optimize noise over a wider range of gains t...