MC44BS373CAD datasheet(13/52 Pages) MOTOROLA

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MC44BS373CA Data Sheet

Modulator High-Frequency Characteristics

11 Modulator High-Frequency Characteristics

Each of the characteristics listed in Table 20 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 only valid for envelope demodulation.

Table 20. High-Frequency Characteristics

Parameter

Test Conditions

Min

Typ

Max

Unit

Type Notes

TVOUT output level

Output signal from modulator section

µVB

1, 2

UHF oscillator frequency

—

460

—

880

MHz

VHF range

From UHF oscillator internally divided

—

460

MHz

TVOUT output attenuation

During transient output inhibit, or when

ATT bit is set to 1

—

dBc

1, 2

Sound subcarrier harmonics

(Fp

+ n × Fs)

Reference picture carrier

—

dBc

Second harmonic of chroma

subcarrier

Using red EBU bar

—

dBc

Chroma/sound intermodulation:

+ (Fsnd – Fchr)

Using red EBU bar

—

dBc

Fo (picture carrier) harmonics

2nd harmonic: CH21

—

µVC

1,3

3rd harmonic: CH21

—

Other channels

—

Out-of-band (picture carrier)

spurious

1/2

× Fo – 1/4 × Fo – 3/2 × Fo – 3/4 ×

From 40 MHz to 1 GHz.

——

µVC

In-band spurious (Fo at 5 MHz)

No video sound modulation.

—

dBc

Notes:

1. See Section 14, “Characterization Measurement Conditions.”

2. See Figure 3.

3. Picture carrier harmonics are highly dependent on PCB layout and decoupling capacitors.

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