MC44353DTB Просмотр технического описания (PDF) - Motorola => Freescale

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MC44353DTB

PLL Tuned UHF Audio/Video Modulator ICs for PAL, SECAM and NTSC TV Systems

Motorola => Freescale 

MC44353 MC44354 MC44355

Test Modes

Various test modes can be enabled, by means of bits

TB0–2 and X0–1. These operate by assigning some internal

signals on the UHF phase comparator output current sources

as outlined in the following 2 tables.

Sound Section Test Modes

The Sound PLL is tested in a similar fashion, and

responds to States 6 and 7 by placing the output of the sound

PLL programmable divider on the upper current source.

Table 3. Sound Subcarrier Frequency

Table 1. Test Mode 1

Test Bits TB0 to TB2 are located in C0, bits 0 to 2:

TB2 TB1 TB0 State Function

0

0

0

0 See Table Test Mode 2

0

0

1

Normal Operation, But Test

1 Pattern Geneartor Disabled

SFD1

SFD0

Sound Subcarrier Freq (MHz)

0

0

4.5

0

1

5.5

1

0

6.0

1

1

6.5

NOTE: 1. Bits SFD1–0 are located in C0 bits 4 and 3.

0

1

0

Upper Source On, Lower

2 Source Off

0

1

1

Lower Source On, Upper

3 Source Off

Figure 15. CCIR Test Line 330

Normal Operation with

1

0

0

4 Inverted Charge Polarity

*1.0

High Impedance

0.86

1

0

1

5

0.72

Test Ref divider on Upper

0.58

1

1

0

6

Source (Fref), Lower Source Off

0.44

**0.3

Test Progr. divider on Lower

1

1

1

7

Source (Fout/2), Upper Source Off

40

1

Step 0

2

3

4

5

Table 2. Test Mode 2

Bits X0 and X1 are located in FL, bits 0 and 1:

X1 X0 State Function

Normal Operation with Non–Inverted

0

0

0a Charge Pump Polarity

Normal Inverted Operation (same as

0

1

0b mode 4), but Transient Output Inhibit

Disabled.

Normal Inverted Operation (same as

1

0

0c mode 4), but Transient Output Inhibit

Circuitry Forced (output disabled).

Normal Inverted Operation (same as

1

1

0d mode 4), but Transient Output Inhibit

counter Sped up (64 times).

NOTE: Not to scale

*100 IRE

** 1 IRE

Figure 16. Noise Measurement/Weighting Filter

0

–4

Approximately Characteristic of Standard

Independent Filter in conformity with CCIR Rec. 567

–8

a

–12

In normal operation, the phase comparator pulls high if the

UHF frequency is too high, and pulls low when the UHF

–16

0

1

2

3

4

5

frequency is too low. This mode is used when the tuning

f

MHz

voltage is generated by the internal inverting operational

amplifier, so in this case mode 4 (100) must be used.

Switching in mode 0d will reset the transient delay counter,

which will time out at an accelerated rate of 64 times the

normal rate.

MOTOROLA ANALOG IC DEVICE DATA

11

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