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digital control of analogue gain

Digital Control of Analogue Gain

THAT's Digital Gain Controllers have been designed to work best with their range of high performance Preamplifiers to add the functionality that users expect in modern audio equipment.

Separating the Preamplifier into a digital and analogue section has the advantage of being able to mix and match parts to best suit your design goals, at the lowest price point. The two chip solution still uses less pcb space and draws less power than the PGA2500 single chip. THAT's wider signal range means that more of the microphones dynamic range can be captured for the rest of the signal chain.

A neat feature is the zero crossing sync output which enables the dsp to coordinate gain changes as well, ideal for finer resolutions.


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Part Number ManufacturerGain RangeNote 1Step SizeVs minVs maxIsV digitalI digitalMax sig inMax sig outGain ErrorCommentsData Sheet
THAT5171 THAT63dB8.6dB then 13.6dB to 68.61dB±4.75V±17V8.3mAnominal 3.3V0.002mA21dBu27dBu±0.25dBUse with 1570, 1580 and 1583 PreampsTHAT5171N32-U datasheet THAT5171N32-U datasheet
THAT5173 THAT60dB0 to 60dB3dB±4.75V±17V7.6mAnominal 3.3V0.002mA27dBu27dBu±0.2dBUse with 1570, 1580 and 1583 PreampsTHAT5173N24-U datasheet
THAT5263 THAT51dB2 channel3dB±5V±17V2.4mAnominal3.3V 29.6dBu29.6dBu Use with 1570, 1580 and 1583 PreampsTHAT5263N24-U datasheet