TLV320AIC27_05 Datasheet, PDF (1/54 Pages) Texas Instruments – STEREO AUDIO CODEC

TLV320AIC27
STEREO AUDIO CODEC
D 3.3-V or 5-V Operation
D 18-Bit Stereo Codec
D S/N Ratio >95 dB
D Multiple Stereo Input Mixer
D Mono and Stereo Volume Control
D 48-Pin TQFP Package
D Power Management Features
D Low-Power Implementation
SLAS253A – MARCH 2000 – REVISED SEPTEMBER 2000
D Four DAC Channels, Stereo ADC
D Balanced Mixer Architecture
D Variable Rate Audio and Modem Support
D Analog 3D Stereo Enhancement
D Line Level Outputs
D Master/Slave ID Selection
D AC97 Rev. 2.1 Compliant
D Complete TI-DSP-CODEC Solution
description
The TLV320AIC27 comprises a stereo 18-bit codec (that is, 2 ADCs and 4 DACs), plus a comprehensive analog
mixer with four sets of stereo inputs, plus one phone input, two microphone inputs, and one PC-beep input.
Additionally, on-chip reference circuits generate the necessary bias voltages for the device, and a bidirectional
serial interface allows transfer of control data, DAC, and ADC words to and from the AC’97 controller. The
TLV320AIC27 is fully compliant with Revision 2.1 of the AC’97 specification.
The TLV320AIC27 has the ADC and DAC functions implemented using oversampled, or sigma-delta,
converters and uses on-chip digital filters to convert these one-bit signals to and from the 48 ksps, 16/18-bit PCM
words that the AC’97 controller requires. The digital and analog sections of the device are powered separately
to optimize performance, and 3.3-V digital and 5-V analog supplies may be used on the same device to further
optimize performance. Digital IOs are 5-V tolerant when the analog supplies are 5 V. Therefore, the
TLV320AIC27 may be connected to a controller running on 5-V supplies, but use 3.3 V for the digital section
of the TLV320AIC27. The TLV320AIC27 is also capable of operating with a 3.3-V supply only (digital and
analog).
When using the TLV320AIC27 codec, the AC’97 controller may be selected from Texas Instruments family of
DSPs. The combination of the computing power of the TI DSP and the high audio performance of the
TLV320AIC27 constitutes a complete solution for various applications. The ability to power down sections of
the device selectively, and the option to alternate the master clock, and hence sample rates, makes such
applications as telecommunications, audio, teleconferencing, and USB, possible.
Additional features added to the Intel™ AC’97 specification, such as the EAPD (external amplifier power down)
bit and internal connection of PC beep to the outputs when the device is reset are supported, as well as optional
features such as variable sample rate support.
There are four modes of operation.
D Basic (2-channel)
D 6-channel I²S
D Quad
D Modem
ESD Sensitive Device. This device is manufactured on a CMOS process. It it therefore generically susceptible to damage from
excessive static voltages. Proper ESD precautions must be taken during handling and storage of this device. As per JEDEC
specifications A112-A and A113-B, this product requires specific storage conditions prior to surface mount assembly. It has been
classified as having a Moisture Sensitivity Level of 2 and as such will be supplied in vacuum-sealed moisture barrier bags.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Intel is a trademark of Intel Corporation.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2000, Texas Instruments Incorporated
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