LP3952RLSLASHNOPB datasheet(19/46 Pages) TI1

19 / 46 page

ASE

VDDA

10 nF

1 M:

GNDA

LP3952

www.ti.com

SNVS518A – JULY 2007 – REVISED MARCH 2013

AUDIO SYNCHRONIZATION ELECTRICAL PARAMETERS (1.65V

≤ VDDIO ≤ VDD1,2V) (unless otherwise

noted)

Parameter

Test Conditions

Min

Typical

Max

Units

ZIN

Input Impedance of ASE

250

500

AIN

Audio Input Level Range

Gain = 21 dB

0.1

(peak-to-peak)

Gain = 0 dB

VDDA-0.1

f3dB

Crossover Frequencies (-3 dB)

Narrow Frequency Response

Low Pass

0.5

Band Pass

1.0 and 1.5

High Pass

2.0

kHz

Wide Frequency Response

Low Pass

1.0

Band Pass

2.0 and 3.0

High Pass

4.0

CONTROL OF ADC AND AUDIO SYNCHRONIZATION (1.65V

≤ VDDIO ≤ VDD1,2V) (unless otherwise noted)

The following table describes the controls required for audio synchronization.

Audio_sync_CTRL1 (2AH)

Input signal gain control. Range 0...21 dB, step 3 dB:

[000] = 0 dB (default)

[011] = 9 dB

[110] = 18 dB

GAIN_SEL[2:0]

Bits 7-5

[001] = 3 dB

[100] = 12 dB

[111] = 21 dB

[010] = 6 dB

[101] = 15 dB

Synchronization mode selector.

SYNC_MODE

Bit 4

SYNCMODE = 0

→ Amplitude Mode (default)

SYNCMODE = 1

→ Frequency Mode

Automatic Gain Control enable

EN_AGC

Bit 3

1 = enabled

0 = disabled (Gain Select enabled) (default)

Audio synchronization enable

1 = Enabled

EN_SYNC

Bit 2

Note : If AGC is enabled, AGC gain starts from current GAIN_SEL gain value.

0 = Disabled (default)

[00] = Single ended input signal, ASE.

[01] = Not used

INPUT_SEL[1:0]

Bits 1-0

[10] = Not used

[11] = No input (default)

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