MC44BS373CADR2 datasheet(16/52 Pages) FREESCALE

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MC44BS373CA Data Sheet

Audio Characteristics

13 Audio Characteristics

Each of the characteristics listed in Table 22 is classified as one of the following types:

•

A—100% tested

•

B—100% correlation tested

•

C—Characterized on samples

•

D—Design parameter

See Section 14, “Characterization Measurement Conditions,” for each C-type parameter.

Unless otherwise stated, VCC = 5.0V, ambient temperature = 25°C, and video input is 1 Vp-p, with 10-step

grey scale and RF output into 75-

Ω load.

NOTE

Specifications are only valid for envelope demodulation.

Table 22. Audio Performance Characteristics 1

1 See Section 14, “Characterization Measurement Conditions.”

Parameter

Test Conditions

Minimum Typical Maximum Unit Type

Picture-to-sound ratio

PS bit set to 1

PS bit set to 0

Audio modulation depth

Using specific pre-emphasis circuit,

audio input level = 205 mVrms, audio frequency = 1 kHz

AM modulation: SECAM Fs=6.5MHz

FM modulation: Fs=5.5, 6, or 6.5 MHz

100% modulation = ±50 kHz FM deviation

FM modulation: NTSC Fs=4.5MHz

100% modulation = ±25 kHz FM deviation

Audio input resistance

Ω

Audio frequency response Reference 0dB at 1kHz

using specified pre-emphasis circuit,

measured from 50 Hz to 15 kHz

(depends on loop filter components)

–2.0

—

+2.0

Audio distortion FM

(THD only)

At 1 kHz, 100% modulation (

±50 kHz)

No video

—0.2

0.8

Audio distortion AM

(THD only)

At 1 kHz, 100% modulation

No video

—1.5

2.5

Audio S/N with sync

buzz FM

Ref 1 kHz, 50% modulation (±25 kHz)

EBU color bars video signal,

using CCIR 468-2 weighting filter

—

Audio S/N with sync

buzz AM

Reference 1kHz, 85% modulation

Video input EBU color bar 75%

Audio BW 40Hz–15kHz,

using CCIR 468-2 weighting filter

—

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