5173N24-U

5173N24-U is a digital gain controller for low-noise, analogue, differential, and current-feedback audio preamplifiers such as the THAT 1580 and 1583. When used in conjunction with an appropriate analogue gain block, this device supports digitally controlled gain from 0dB to 60dB in 3dB steps, while preserving low noise and distortion. It operates from ±5V to ±17V analogue supplies, supporting input signal levels as high as +27dBu (at 0dB gain and ±17V supplies) in combination with the 1580 or 1583 without an input pad. It includes a differential servo and zero-crossing detector to minimize DC offsets and glitches (zipper noise) during gain adjustments. It is used in applications such as digitally controlled microphone preamplifiers, digitally controlled instrumentation amplifiers, digitally controlled differential amplifiers, audio mixing consoles, PC audio breakout boxes, audio distribution systems, digital audio snakes, and portable audio recorders.

• Integrated differential servo minimizes output offset
• Zero-crossing detector minimizes switching noise
• Daisy chainable SPI interface, four general-purpose digital outputs
• Analog supply current is 7.2mA typical, digital supply current is 2µA typical
• Gain range from 0 to 60dB at (VCC – 1.6 <gt/> VIN2 <gt/> VEE + 1.6)
• Gain step size is 3dB typical at (0dB ≤ Gain ≤ 60dB)
• Input offset voltage is +1.75mV max, PSRR is 115dB typ at (VCC = -VEE; ±5V to ±15V)
• Input leakage current is 2µA typical, input capacitance is 3.5pF typical
• SCLK frequency is 10MHz max, THD+N is 0.001% typ at (f = 1KHz, Gain = 21dB)
• Operating temperature range from -40°C to +85°C, 24-pin QFN package