tda4455 ATMEL Corporation, tda4455 Datasheet

tda4455

Manufacturer Part Number

tda4455

Description

Multistandard Amplifier Demodulator

Manufacturer

ATMEL Corporation

Datasheet

1.TDA4455.pdf (12 pages)

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Rev. A1: 08.05.1995

Multistandard VIF Amplifier and PLL Demodulator

Application

Monolithic integrated circuit for vision IF signal processing in multistandard TV and VTR sets.

Description

This multistandard video IF processing circuit with PLL

picture carrier regeneration gives a high performance of

linear video demodulation.

With two IF inputs (Pins 1–2 and Pins 17–18), it is

possible to select between two signal sources. The input

selector switch (Pin 16) works independent from the

standard switch (Pin 11).

The IF signal is internally fed via a 3-stage controlled

wideband amplifier to the video demodulator and the

phase detector. The phase detector compares the phase of

IF signal (0 ) with the output signal of the VCO (90 ) and

sets the VCO frequency accordingly. A lock detector

switches the PLL loop filter according to the state of the

PLL (locked-PLL slow, unlocked-PLL fast).

A second output of the VCO (0 ) provides the reference

carrier for the video demodulator. The polarity of the

demodulator can be inverted by the standard switch

(Pin 11), so that negative or positive modulated IF signals

Features

Package Options

Case: 18-pin DIL plastic

TELEFUNKEN Semiconductors

negative and positive modulated IF-signals with equal

Suitable for standard B/G, L and D2MAC, processes

polarity of the output signal

Two IF-inputs, for switching between two signal

sources (e.g., two tuners and two SAW-filters)

High performance video demodulator with PLL

picture carrier regeneration

Extended video bandwidth (12 MHz) for the demodu-

lation of amplitude modulated MAC-signals

Standard B/G: AGC acting on the sync peak pulse

Preliminary Information

are always available with the same polarity at the demo-

dulator output. The demodulated video signal is filtered,

amplified and fed via an interference limiter to the video

output (Pin 7).

The standard switch also determines the clamp level of

the video amplifier and the required IF-AGC mode. In the

standard B/G mode the sync peak value is the criterion for

a fast charge and discharge. In the standard L mode on the

other hand, fast AGC action is achieved by charging at

peak white level and discharging by the averaged video

signal (time constant on Pin 8). The response level for

discharge has a hysteresis. In the D2MAC mode a similar

function is applied to achieve the AGC, but with different

threshold levels.

An overload detector prevents the PLL becoming

unlocked by large IF input signals.

To achieve a delayed tuner-AGC action, the current out-

put (Pin 4) can be adjusted with a resistor at Pin 3.

average value controlled capacitor discharge and

Standard L: fast AGC acting on peak white level with

reference hysteresis

D2MAC: fast AGC acting on peak level with

controlled capacitor discharge

Output for delayed tuner-AGC, take over point

adjustable

High input sensitivity

Ultra white and ultra black limiting

Supply voltage range 6.8 to 13 V

Low power consumption

ESD protection

TDA4455

1 (12)

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tda4455 Summary of contents

Page 1

... Standard B/G: AGC acting on the sync peak pulse Package Options Case: 18-pin DIL plastic Rev. A1: 08.05.1995 Preliminary Information TDA4455 are always available with the same polarity at the demo- dulator output. The demodulated video signal is filtered, amplified and fed via an interference limiter to the video output (Pin 7). ...

Page 2

... TDA4455 Block Diagram Input selector Loop filter switch 16 13 Video Lock detector 17 IF Input Input Tuner AGC 3 Tuner AGC take over Pin Description Pin Symbol Function input 1 3 Tuner AGC adjustment (turn over point) 4 Delayed tuner AGC current ...

Page 3

... min ( min ( min ( min ( min ( TDA4455 Value Unit 6 5.0 mA 720 mW +125 C –25 to +85 C –25 to +125 C Value Unit 60 K/W 3 (12) ...

Page 4

... TDA4455 Electrical Characteristics reference point Pin 5, unless otherwise specified amb Parameters Test Conditions / Pins DC-supply Supply voltage Supply current IF-amplifier Pins 1–2 or Pins 17–18 Input sensitivity sync peak value, B/G Input impedance Input capacitance IF-AGC IF gain control range Response time, standard L ...

Page 5

... Apply a 38.9 MHz unmodulated carrier signal to the IF input (Pins 1–2 or Pins 17–18); adjust the input level so that the AGC voltage at Pin 6 is between 2.0 V and 2 Adjust the VCO circuit until at Pin 12 is the same DC- voltage as measured in step 2. TDA4455 Typ. Max. Unit 2 mV ...

Page 6

... TDA4455 Pin Related Internal Circuits (Continued 7675 93 7676 Figure 2. Pin 3 93 7677 4 Figure 3. Pin 4 6 (12) Preliminary Information TELEFUNKEN Semiconductors W 1 Figure 1. Pin 1–2, Pin 17–18 93 7678 Figure 4. Pin 6 Figure 5. Pin 7879 ...

Page 7

... Pin Related Internal Circuits (Continued Figure 6. Pin Figure 7. Pin 9– 12.5 12.5 W 300 11 Figure 8. Pin 11 Rev. A1: 08.05.1995 Preliminary Information 7680 93 7681 93 7685 93 7682 TDA4455 2 7683 Figure 9. Pin 7684 Figure 10. Pin 13 16 Figure 11. Pin 16 7 (12) ...

Page 8

... TDA4455 IF-AGC, Switching Thresholds 93 7645 93 7646 93 7647 Dig.: Analog: Sound Chrominance +Sync. Diff.: Signal Figure 14. D2MAC-standard (neg. modulated) 8 (12) Preliminary Information TELEFUNKEN Semiconductors 4.2 V Ultra white level: zero carrier 4.0 V White level carrier 2.0 V Sync. peak level: 100% carrier (charge / discharge threshold) Figure 12. B/G-standard (neg. modulated) 4 ...

Page 9

... TELEFUNKEN Semiconductors Test Circuit Rev. A1: 08.05.1995 Preliminary Information TDA4455 9 (12) ...

Page 10

... TDA4455 Application Circuit 10 (12) Preliminary Information TELEFUNKEN Semiconductors Rev. A1: 08.05.1995 ...

Page 11

... TELEFUNKEN Semiconductors Dimensions in mm Package: DIP 16 Rev. A1: 08.05.1995 Preliminary Information TDA4455 94 9128 11 (12) ...

Page 12

... TDA4455 Ozone Depleting Substances Policy Statement It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment ...

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