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TLV320AC36IPTR Datasheet(PDF) 2 Page - Texas Instruments

Part # TLV320AC36IPTR
Description  3-V VOICE-BAND AUDIO PROCESSORS (VBAPE)
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Manufacturer  TI [Texas Instruments]
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TLV320AC36IPTR Datasheet(HTML) 2 Page - Texas Instruments

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TLV320AC36, TLV320AC37
3-V VOICE-BAND AUDIO PROCESSORS (VBAP
™)
SLWS006B – NOVEMBER 1994 – REVISED OCTOBER 1997
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description
The TLV320AC36 and TLV320AC37 voice-band audio processor (VBAP) integrated circuits are designed to
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 zero 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 band-pass 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 takes a frame of serial data on DIN and converts it 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 equal to VCC/2, VMID, 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 TLV320AC3xC devices are characterized for operation from 0
°C to 70°C. The TLV320AC3xI devices are
characterized for operation from – 40
°C to 85°C.


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