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ADCs target digital audio processing apps

Posted: 13 Apr 2007     Print Version  Bookmark and Share

Keywords:stereo ADC  digital audio  decimation filtering 

Texas Instruments Inc. (TI) has introduced two 24bit, 216kHz ADCs to complete the company's audio signal chain for professional digital audio recording and processing applications. The new dual-channel devices combine high integration with a dynamic range of up to 124dB SNR, said to be the industry's highest, while still reducing power consumption by 50 per cent compared to competing products.

Studio, live sound support
The PCM4220 and PCM4222 integrate an on-chip, linear phase decimation filtering engine that supports both classic and low group delay filter responses, allowing designers to optimise the device for either studio or live sound applications. The PCM4222 enables designers to achieve system flexibility through a 6bit modulator output that bypasses the digital decimation filter. This option provides versatility to create a digital filter in an FPGA, further customising the performance for end-product differentiation. Both devices simplify board layout and system partitioning with a time division multiplex function that allows OEMs to daisy chain up to four devices into a single serial port on a DSP or FPGA.

In addition to high levels of performance and integration, these new devices consume only 305mW of power at 48kHz, ultimately easing power supply design and enabling the option to power computer audio interfaces entirely through USB or Firewire bus.

Complementary devices
When combined with the PGA2500 preamplifier and the OPA1632 audio amplifier, the PCM4222 complements the highest-performance input signal chain available, according to the company. When combined with a 132dB DAC, such as the PCM1792A, and a low-noise headphone amplifier, such as the TPA6120A2, the fidelity of the signal can be maintained from input to output.

The PCM4222 and PCM4220 are available in 48-pin TQFP packages. Pricing for the PCM4222 is Rs.661.80 ($14.95) and the PCM4220 is Rs.441.20 ($9.95) each in quantities of 1,000 units.

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