FEATURES
• Low Noise: 1nV/√Hz input noise (60 dB gain)
• Low Noise at Unity Gain: -109 dBu
• Low THD+N:
0.0005% @ 30 dB gain
0.0008% @ 40 dB gain
• Low Current: 7.5 mA typ
• Wide Bandwidth: 4.2 MHz @ 40dB gain
• High Slew Rate: 53 V/µs
• Wide Signal Swing: >28.7 dBu (±18V supplies)
• Gain adjustable from 0 to > 60 dB
• Differential output
• Small 4x4mm QFN16 package
• Mates with THAT5171 Digital Preamplifier Controller or
THAT5173 Digital Preamplifier Controller
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Datasheet Download
1570 Datasheet (130 kB)
Low-Noise Differential Audio Preamplifiers
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 than is possible with fixed RA and RB.
The 1570 is designed to mate perfectly with THAT's 5171 and 5173 Digital Preamplifier Controller ICs. Along with the 1570, these switched resistor networks provide optimized, digitally controlled audio preamplifiers.
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