6261N48-U

6261N48-U is a two-channel “all-in-one” digitally controlled preamplifier with integrated ADC drivers. The parts’ outputs interface directly to commonly used 5V ADC ICs with 2Vrms differential full-scale inputs. Therefore, it serves as a complete solution to connect an audio input to an A/D converter. To minimize audibility of gain changes with signal, all 626x family members can be programmed to synchronize gain changes with signal zero crossings. A BUSY pin for each channel allows external events to be synchronized with zero crossings. This enables external gain changes to be seamless with internal ones. It is used in applications such as digitally controlled input stages, microphone preamplifiers, instrumentation amplifiers, differential amplifiers, audio mixing consoles, PC audio interfaces, digital video cameras, digital audio snakes, portable audio recorders, and programmable gain amplifiers.

• Equivalent input noise is -127dBu typical at (gain = +34dB)
• Gain range from -8dB to 34dB, input bias current is 2.5µA typical
• Max differential input level is 16.5dBu typical at (-8dB gain THD: 0.15% at 1KHz)
• Integrated ADC driver with reference input, input offset current is 250nA typical
• CMRR is 65dB typical at (f = 1KHz, gain =- 8dB), individually controlled standby and mute
• Zero crossing detectors minimize zipper noise, daisy-chainable SPI control interface
• Slew rate is 6.7V/µS typical at (RL = 2Kohm, CL = 5pF)
• Preamp positive supply current is 4.8mA typical at (normal operation)
• THD+N is 0.0015% typical at (1KHz, 2Vrms out +10dB gain)
• Operating temperature range from -40°C to +85°C, 48 pin QFN package