LM4450B datasheet(6/45 Pages) TI1

tên linh kiện	LM4450B

Giải thích chi tiết về linh kiện	LM4550B AC 97 Rev 2.1 Multi-Channel Audio Codec With Stereo Headphone Amplifier, Sample Rate Conversion and TI 3D Sou

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LM4550B

SNAS276G – MAY 2005 – REVISED SEPTEMBER 2015

www.ti.com

Pin Functions (continued)

I/O

DESCRIPTION

NAME

NO.

Left Stereo Channel Output

This line level output (1 Vrms nominal) is fed from the left channel of the Stereo Mix signal from MIX2

LINE_OUT_L

35

O

through the Master Volume register, 02h. The LINE_OUT_L amplitude can be muted (along with

LINE_OUT_R) or adjusted from 0 dB to –46.5 dB in 1.5-dB steps.

Right Stereo Channel Output

This line level output (1 Vrms nominal) is fed from the right channel of the Stereo Mix signal from MIX2

LINE_OUT_R

36

O

through the Master Volume register, 02h. The LINE_OUT_R amplitude can be muted (along with

LINE_OUT_L) or adjusted from 0 dB to –46.5 dB in 1.5-dB steps.

Mono Output

This mono line level output (1 Vrms nominal) is fed from either a microphone input (MIC1 or MIC2,

after boost amplifier) or from the mono sum of the left and right Stereo Mix 3D channels from MIX1.

MONO_OUT

37

O

The optional TI 3D Sound enhancement can be disabled (default) by the 3D bit (bit D13) in the

General Purpose register, 20h. Choice of input is by the MIX bit (D9) in the same register. MIX=0

selects a microphone input. Output level can be muted or adjusted from 0 dB to –46.5 dB in 1.5-dB

steps through the Mono Volume register, 06h.

Left Stereo Channel Output

This line level output (1 Vrms nominal) is fed from the left channel of the Stereo Mix signal from MIX2

HP_OUT_L

39

O

through the Headphone Volume register, 04h. The HP_OUT_L amplitude can be muted (along with

HP_OUT_R) or adjusted from 0 dB to –46.5 dB in 1.5-dB steps

AC Ground Reference

In normal use, this input is the AC ground reference for HP_OUT_L and HP_OUT_R. It must be

capacitively coupled to analog ground with short traces to maximize performance. It is not a DC

HP_OUT_C

40

I

ground.

For non-stereo applications it may also be used to provide common-mode feedback with HP_OUT

configured as one differential output rather than as outputs for two single-ended stereo channels.

Right Stereo Channel Output

This line level output (1 Vrms nominal) is fed from the right channel of the Stereo Mix signal from MIX2

HP_OUT_R

41

O

through the Headphone Volume register, 04h. The HP_OUT_R amplitude can be muted (along with

HP_OUT_L) or adjusted from 0 dB to –46.5 dB in 1.5-dB steps

DIGITAL I/O AND CLOCKING

24.576 MHz crystal or external oscillator input

To complete the oscillator circuit use a fundamental mode crystal operating in parallel resonance and

connect a 1M

Ω resistor across pins 2 and 3. Choose the load capacitors (Figure 25, C1, C2) to suit

the load capacitance required by the crystal (that is, C1 = C2 = 33 pF for a 20 pF crystal. Assumes

XTL_IN

2

I

that each Input + trace capacitance is 7 pF).

This pin may also be used as the input for an external oscillator (24.576 MHz nominal) at standard

logic levels (VIH, VIL).

This pin is only used when the codec is in Primary mode. It may be left open (NC) for any Secondary

mode.

24.576 MHz crystal output

Used with XTAL_IN to configure a crystal oscillator.

XTL_OUT

3

O

When the codec is used with an external oscillator this pin should be left open (NC).

When the codec is configured in a Secondary mode this pin is not used and may be left open (NC).

Input to codec

This is the input for AC Link Output Frames from an AC '97 Digital Audio Controller to the LM4550B

SDATA_OUT

5

I

codec. These frames can contain both control data and DAC PCM audio data. This input is sampled

by the LM4550B on the falling edge of BIT_CLK.

AC Link clock

An OUTPUT when in Primary Codec mode. This pin provides a 12.288-MHz clock for the AC Link.

The clock is derived (internally divided by two) from the 24.576-MHz signal at the crystal input

BIT_CLK

6

I/O

(XTL_IN).

This pin is an INPUT when the codec is configured in any of the Secondary Codec modes and would

normally use the AC Link clock generated by a Primary Codec.

Output from codec

This is the output for AC Link Input Frames from the LM4550B codec to an AC '97 Digital Audio

SDATA_IN

8

O

Controller. These frames can contain both codec status data and PCM audio data from the ADCs. The

LM4550B clocks data from this output on the rising edge of BIT_CLK.

6

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