參數(shù)資料
型號(hào)： TLV320AD11A
廠商： Texas Instruments, Inc.
元件分類： Codec
英文描述： 3.3 V INTEGRATED ADSL OVER POTS CODEC
中文描述： 3.3伏集成ADSL POTS和編解碼器
文件頁(yè)數(shù)： 8/28頁(yè)
文件大?。?/td> 412K
代理商： TLV320AD11A
TLV320AD11A
3.3 V INTEGRATED ADSL OVER POTS CODEC
SLWS087B – JUNE 1999 – REVISED MARCH 2000
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
interface (continued)
keep-out zones
The last CLKIN cycle before a transition of CLKOUT is defined as a keep-out zone. These zones are reserved
for the sampling of analog signals. All digital I/O (except for CLKIN) should be quiet during these keep-out zones.
over-sampling mode
The OSEN pin selects 2X over-sampling mode (INT running at 4.416 MHz), or 1X over-sampling mode (INT
running at 2.208 MHz).
serial interface
The serial port is used for codec configuration and register reading. The word length is 16-bit. Two hardware
configuration terminals, ADR[1:0], are used to configure the device ID. Up to four codecs can be identified for
each common serial port. Refer to figure 6 for timing and format.
The master codec (ADR[1:0] = [0,0]) provides the SCLK to the host processor. The SCLK terminals on the other
codecs are left unconnected. All the codecs in a multi-codec system should be synchronized so that their SCLK
signals are in phase, even though the signals themselves are not being used. This ensures that, even though
the individual SCLK signals of each codec are not being used, the data is being latched into the codec properly.
The SCLK is a continuously running 4.416-MHz fixed-frequency clock, synchronized to the codec internal
events and CLKOUT (to the host) so that the keep-out zones may be monitored. A host DSP can drive the FS
(synchronized to the CLKOUT from the codec) into the codec to initiate a 16-bit serial I/O frame.
If SCR5 needs to be updated, the host controller (DSP) must first write the SCR5 of the VCXO DAC data, and
then the SCR4 of the VCXO DAC data. The VCXO DAC only gets updated after the SCR4 is written.
GP port
The general-purpose port provides eight outputs, each capable of delivering 0.5 mA, for control of external
circuitry such as LEDs, gain control, and power down.
voltage reference
The built-in reference provides the required reference voltage and current to individual analog blocks. It is also
brought out to external terminals for noise decoupling.
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