Inside:Showcase (Volume 28) is available in HTML and PDF format. - 351KB
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Three new stereo audio codecs provide consumer quality audio solutionsProduct FeaturesTLC320AD90/91
TLC320AD90
The TLC320AD90 is a 16-bit digital audio codec that is fully compliant with Audio Codec '97 (AC'97) specifications. This high-performance device provides an integrated 600- power amplifier, analog mixers, and volume control. The 'AD90 is an excellent choice for CD-quality digital audio systems such as audio/video conferencing, musical instruments, and high end PC audio cards.
The 'AD90 provides performance of 94 dB typical signal-to-noise ratio (SNR) on the digital-to-analog converter (DAC) and 93 dB on the analog-to-digital converter (ADC). The AC'97 specification for minimum SNR is 85 dB and 75 dB respectively. Also, high quality FIR and Bissel Linear Phase Filtering is used to improve audio quality. The 'AD90 also exceeds other parameters like intermodulation distortion and crosstalk. For example, the specification requires 70 dB for crosstalk and the 'AD90 provides 100 dB. In addition, the common mode rejection ratio (CMRR) for the CD-ROM inputs provides 76 dB rejection from CD-ROM servo motor noise present in PC audio systems. Similarly, the Power Supply Rejection Ratio (PSRR) allows high system performance in real-world environments. Additional features include a 5-V or 3.3-V digital interface and a low-power mode with a standby current of 100 µA (typical). The TLC320AD90 is available in a 64-pin TQFP packaging. TLC320AD91The TLC320AD91 is a high quality, AC'97-compliant stereo audio codec for PC mother-board and add-in card audio applications. It performs full-duplex 18-bit codec functions at 48 K samples/second, and also provides a comprehensive analog mixer with 4 sets of stereo inputs, plus telephone, 2 microphone, and PC-beep inputs.The 'AD91 provides performance of 90 dB typical SNR on the DAC and 80 dB SNR on the ADC. The codec also exceeds other parameters like intermodulation distortion and crosstalk, and adds high quality FIR and Bissel Linear Phase Filtering as well as a 46 dB PSRR for improved audio quality in real-world environments. Additional features include 5-V or 3.3-V digital interface with low power mode, mono and stereo volume control, and registered Microsoft Plug and Play Vendor ID. On-chip reference circuits generate the necessary bias voltages for the device. A 5-pin digital bi-directional serial interface allows transfer of control data, DAC, and ADC words to and from the AC'97 controller. The 'AD91 is available in a 48-pin TQFP packaging. TLC320AD80
The TLC320AD80 audio subsystem combines a 16-bit sigma-delta stereo audio DAC, analog volume and balance control, analog TV baseband control, de-emphasis filter and an analog wide-band multiplexer to provide a powerful and inexpensive solution for set-top box applications. The 'AD80 multiplexes two analog stereo inputs and one monaraul analog with the DAC outputs and routes this output externally or through volume and balance controls. An additional analog port accepts TV baseband signals and outputs monaural audio.
The 'AD80 DAC provides 85 dB SNR typical, with nominal system power dissipation of 260 mW. Also, the sample rate for the device can be varied from a minimum of 8 kHz to a maximum of 48 kHz. The optimized device integrates six audio input ports, two serial PCM audio inputs, two stereo analog audio inputs and two monaural analog audio inputs. Together, the ports are designed to decrease overall system cost with features like an internal decoder for TV baseband signals. Other features include a flexible stereo port that is I2S compatible, an SPI bus-compatible control interface, digital filtering, and on-chip timing and control. Typical applications for the TLC320AD80 include Direct Broadcast Satellite (DBS) boxes, digital cable or telco set-top boxes, digital cable or telco set-top boxes, HDTV, digital audio broadcast receivers and video laser disks. The 'AD80 is available in a 64-pin TQFP package.
Vol 28 August, 1998 |
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| TLC320AD90 |
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| TLC320AD91 |
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| TLC320AD80 |
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