|Category||Multimedia => Audio => Codecs => Voice-Band Codecs|
|Description||ti TLV320AC56, 3-V Voice-band Audio Processors|
|Company||Texas Instruments, Inc.|
|Datasheet||Download TLV320AC56CDW datasheet
Single 3-V Operation Low Power Consumption: Operating Mode. 20 mW Typ Standby Mode. 5 mW Typ Power-Down Mode. 2 mW Typ Combined A/D, D/A, and Filters Extended Variable-Frequency Operation Sample Rates to 16 kHz Passband to 7.2 kHz Electret Microphone Bias Reference Voltage Available Drive a Piezo Speaker Directly Compatible With All Digital Signal Processors (DSPs)
Selectable Between 8-Bit Companded and 13-Bit (Dynamic Range) Linear Conversion: TLV320AC56. µ-Law and Linear Modes TLV320AC57. A-Law and Linear Modes Programmable Volume Control in Linear Mode to 3.6-kHz Passband with Specified Master Clock Designed for Standard 2.048-MHz Master Clock for U.S. Analog, U.S. Digital, and CT2, DECT, GSM, and PCS Standards for Hand-Held Battery-Powered TelephonesPDN EARA EARB EARGS VCC MICMUTE DCLKR DIN FSR EARMUTE
MICBIAS MICGS MICIN VMID GND LINSEL TSX/DCLKX DOUT FSX CLK
NC EARGS EARB EARA PDN MICBIAS MICGS MICIN NC
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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. VBAP is a trademark of Texas Instruments Incorporated.
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.description
The TLV320AC56 and TLV320AC57 voice-band audio processor (VBAP) integrated circuits perform the transmit encoding (A /D conversion) and receive decoding (D/A conversion) together with transmit and receive filtering for voice-band communications systems. Cellular telephone systems are targeted in particular; however, these integrated circuits can function in other systems including digital audio, telecommunications, and data acquisition. These devices are pin-selectable for either of two modes companded and linear providing data in two formats. In the companded mode, data is transmitted and received in 8-bit words. In the linear mode, 13 bits of data and either three bits of gain-setting control data, or three 0 bits of padding (to create a16-bit word), are sent and received. The transmit section is designed to interface directly with an electret microphone element. The microphone input signal (MICIN) is buffered and amplified with provision for setting the amplifier gain to accommodate a range of signal input levels. The amplified signal is passed through antialiasing and bandpass filters. The filtered signal is then applied to the input of a compressing analog-to-digital converter (COADC) when companded mode is selected. Otherwise, the analog-to-digital converter performs a linear conversion. The resulting data is then clocked out of DOUT as a serial data stream. The receive section converts a frame of serial data on DIN to analog through an expanding digital-to-analog converter (EXDAC) when the companded mode is selected; otherwise, a linear conversion is performed. The analog signal then passes through switched capacitor filters, which provide out-of-band rejection, (sin x)/x correction functions, and smoothing. The filtered signal is sent to the earphone amplifier. The earphone amplifier has a differential output with adjustable gain and is designed to minimize static power dissipation. A single on-chip high-precision band-gap circuit generates all voltage references, eliminating the need for external reference voltages. An internal reference voltage, VMID, equal to VCC /2 is used to develop the midlevel virtual ground for all the amplifier circuits and the microphone bias circuit. Another reference voltage, MICBIAS, can supply bias current for the microphone. The TLV320AC5xC devices are characterized for operation from to 70°C. The TLV320AC5xI devices are characterized for operation from to 85°C.
LINSEL 15 MICMUTE MICIN 6 18 Input Buffer Transmit Third-Order Antialias Transmit Sixth-Order Low Pass Transmit First-Order High Pass ADC Output Logic 13 DOUT
12 MICGS 19 256 kHz Band-Gap Voltage Reference A/D Converter Voltage Reference 256 kHz D/A Converter Voltage Reference 8 kHz Autozero 8 kHz
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