Philips tda9804 DATASHEETS

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TDA9804

VIF-PLL demodulator with internal or external AGC and FM-PLL detector

Preliminary speciﬁcation File under Integrated Circuits, IC02

November 1992

Philips Semiconductors Preliminary speciﬁcation

VIF-PLL demodulator with internal or

TDA9804

external AGC and FM-PLL detector

FEATURES

• Suitable for negative vision modulation controlled by internal or external AGC

• Gain controlled 3-stage IF amplifier; suitable for VIF frequencies up to 60 MHz

• True synchronous demodulation with active carrier regeneration (ultra-linear demodulation, good intermodulation figures, reduced harmonics and excellent pulse response)

• Peak sync AGC for negative modulation, e.g. B/G standard

• Voltage controlled external AGC enabled by switching pin

• Video amplifier to match sound trap and sound filter

QUICK REFERENCE DATA

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

i IF

positive supply voltage (pin 20) 4.5 5 8.8 V supply current 51 60 69 mA vision IF input signal sensitivity (RMS value, pins 1 and 2) − 50 90 µV maximum vision IF input signal (RMS value, pins 1 and 2) 70 150 − mV

o CVBS

IF gain control range 64 70 73 dB

CVBS output signal on pin 7 (peak-to-peak value) 1.7 2.0 2.3 V B −3 dB video bandwidth on pin 7 6 8 − MHz S/N (W) signal-to-noise ratio weighted; for video 56 59 − dB

1.1

3.3

o AF

amb

intermodulation attenuation 56 62 − dB

suppression of harmonics in video signal 35 40 − dB

maximum AF output signal for THD < 1.5% (RMS value, pin 9) 0.8 −−V

operating ambient temperature range 0 − +70 °C

• AGC output voltage for tuner; adjustable take-over point (TOP)

• AFC detector without extra reference circuit

• Alignment-free FM-PLL detector with high linearity

• Stabilizer circuit for ripple rejection and to achieve

constant output signals

• 5 to 8 V positive supply voltage range, low power consumption (300 mW at +5 V supply voltage)

GENERAL DESCRIPTION

The TDA9804 is a monolithic integrated circuit for vision and sound IF signal processing in TV and VTR sets.

56 62 − dB

ORDERING INFORMATION

EXTENDED TYPE

NUMBER

TDA9804 20 DIL plastic SOT146

Note

1. SOT146-1; 1996 November 27.

November 1992 2

PINS

POSITION

PACKAGE

MATERIAL CODE

(1)

Philips Semiconductors Preliminary speciﬁcation

VIF-PLL demodulator with internal or external AGC and FM-PLL detector

TDA9804

November 1992 3

Fig.1 Block diagram.

Philips Semiconductors Preliminary speciﬁcation

VIF-PLL demodulator with internal or external AGC and FM-PLL detector

PINNING

SYMBOL PIN DESCRIPTION

i IF

TADJ 3 tuner AGC take-over adjust (TOP) φADJ 4 phase detector adjust Mute

SWI

PLL

o CVBS

AGC

SWI

o AF

i IC

TAGC 12 tuner AGC output V

o VID

i VID

AFC 15 automatic frequency control output VCO1 16 VCO reference circuit for 2 fpc VCO2 17 GND 18 ground (0 V) C

AGC

1 vision IF differential input signal 2

5 mute switch input 6 PLL time constant of phase detector 7 CVBS (positive) output signal 8 internal/external AGC switch 9 audio frequency output signal

10 decoupling capacitor of audio frequency

ampliﬁer

11 sound intercarrier input signal

13 video and sound intercarrier output signal 14 video input signal to buffer ampliﬁer

19 AGC capacitor and external AGC voltage 20 positive supply voltage

TDA9804

Fig.2 Pin configuration.

November 1992 4

Philips Semiconductors Preliminary speciﬁcation

VIF-PLL demodulator with internal or external AGC and FM-PLL detector

FUNCTIONAL DESCRIPTION Vision IF input

The vision IF amplifier consists of three AC-coupled differential amplifier stages; each stage comprises a controlled feedback network by means of emitter degeneration.

IF and tuner AGC

The automatic control voltage to maintain the video output signal at a constant level is generated according to the transmission standard. Since the TDA9804 is suitable for negative modulation only the peak-sync level is detected. The AGC detector charges and discharges the capacitor on pin 19 to set the IF gain and the tuner gain. In case of an external AGC (depending on the input voltage at pin 8) the internal charging and discharging currents are switched off and an external AGC voltage has to be applied to pin 19. The AGC capacitor voltage is transferred to an internal IF control signal, and is fed to the tuner AGC to generate the tuner AGC output current on pin 12 (open-collector output). The tuner AGC voltage take over point is adjusted on pin 3. This allows the tuner and the IF SAW filter to be matched to achieve the optimum IF input level.

Frequency detector, phase detector and video demodulator

The IF amplifier output signal is fed to a frequency detector and to a phase detector. The frequency detector is operational before lock-in. A DC current is generated which is proportional to the frequency difference between the input frequency and the VCO frequency. After lock-in, the frequency detector and the phase detector generate a DC current proportional to the phase difference between VCO and input signals. The control signal for the VCO is provided by the phase detector. The video demodulator is a linear multiplier, designed for low distortion and wide bandwidth. The vision IF input signal is multiplied by the in-phase component of the VCO output. The demodulated output signal is fed via an integrated low-pass filter (f to the video amplifier for suppression of the carrier harmonics.

= 12 MHz)

TDA9804

VCO and travelling wave divider

The VCO operates with a symmetrically-connected reference LC-circuit, operating at double vision carrier frequency. Frequency control is performed by an internal varicap diode. The voltage to set the VCO frequency to the actual frequency of double vision carrier frequency, is also amplified and converted for the AFC output current. The VCO signal is divided-by-two in a travelling wave divider, which generates two differential output signals with 90 degree phase difference independent of frequency.

Video ampliﬁer, buffer and noise clipping

The video amplifier is a wide bandwidth operational amplifier with internal feedback. A nominal positive modulated video signal of 1 V (p-p) is present on the composite video output (pin 13). The input impedance of the 7 dB wideband buffer amplifier (with internal feedback) is suitable for ceramic sound trap filters. The CVBS output (pin 7) provides a positive video signal of 2 V (p-p). Noise clipping is provided internally.

Sound demodulation

The FM sound intercarrier signal is fed to pin 11 and through a limiter amplifier before it is demodulated. This achieves high sensitivity and high AM suppression. The limiter amplifier consists of seven internal AC-coupled stages, minimizing the DC offset. The FM-PLL demodulator consists of an RC-oscillator, loop filter and phase detector. The oscillator frequency is locked on the FM intercarrier signal from the limiter amplifier. As a result of this locking, the RC-oscillator is frequency-modulated. The modulating signal voltage (AF signal) is used to control the oscillator frequency. By this, the FM-PLL works as an FM demodulator. The audio frequency amplifier with internal feedback is designed for high gain and high common mode rejection. The low-level AF signal coming out of the FM-PLL demodulator is amplified and buffered in a low-ohmic audio signal output stage (pin 9). An external decoupling capacitor on pin 10 removes the DC voltage from the audio amplifier input.

November 1992 5

Philips Semiconductors Preliminary speciﬁcation

VIF-PLL demodulator with internal or

TDA9804

external AGC and FM-PLL detector

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC134)

SYMBOL PARAMETER MIN. MAX. UNIT

s max

stg

ESD

Notes to the Limiting Values

1. Supply current I

2. Equivalent to discharging a 200 pF capacitor through a 0 Ω series resistor (negative and positive voltage).

THERMAL RESISTANCE

supply voltage (pin 20) for a maximum chip temperature (note 1)

SOT146 at+120 °C 0 8.8 V

voltage on pins 1, 2, 7, 11, 13, 14, 15 and 19 0 V

V short-circuit time − 10 s tuner AGC output voltage − 13.2 V storage temperature range −25 +150 °C electrostatic handling for all pins (note 2) −±300 V

= 69 mA at T

amb

= +70 °C.

SYMBOL PARAMETER THERMAL RESISTANCE

th j-a

from junction to ambient in free air

SOT146 73 K/W

November 1992 6

Philips Semiconductors Preliminary speciﬁcation

VIF-PLL demodulator with internal or

TDA9804

external AGC and FM-PLL detector

CHARACTERISTICS

= 5 V; T

level at B/G); video modulation DSB; residual carrier: B/G = 10%; video signal in accordance with CCIR line 17; measurements taken in Fig.3 unless otherwise speciﬁed

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

AGC switch input (pin 8) V

Vision IF input (pins 1 and 2) V

∆V

B −3 dB IF bandwidth upper cut-off

1,2

True synchronous video demodulator

VCO

∆f

VCO

o ref

∆f

acqu

i IF

loop

= +25 °C; fPC= 38.9 MHz; fSC= 33.4 MHz with VPC/VSC= 13 dB (B/G); ViF= 10 mV RMS value (sync

amb

supply voltage range (pin 20) see note 1 4.5 5 8.8 V supply current 51 60 69 mA

input voltage for internal AGC see note 2 1.5 − V

input voltage for external AGC 0 − 0.8 V LOW level input current V8=0 V −−300 −360 µA

B/G standard

input signal sensitivity (RMS value) −1 dB video at output − 50 90 µV maximum input signal (RMS value) +1 dB video at

70 150 − mV

output

IF amplitude difference between picture

within AGC range − 0.7 1 dB

and sound carrier IF gain control range see Fig.4 64 70 73 dB

70 100 − MHz

frequency input resistance 1.7 2.2 2.7 kΩ input capacitance 1.2 1.7 2.5 pF DC input voltage 3.0 3.4 3.8 V

see note 3 maximum oscillator frequency for

f=2f

125 130 − MHz

carrier regeneration oscillator drift (free running) as a

function of temperature oscillator swing at pins 16 and 17

see note 4;

∆T = 0 to+70 °C

−−±1300 10

tbn 120 tbn mV

(RMS value) vision carrier capture range (negative) 1.5 2 − MHz vision carrier capture range (positive) 1.5 2 − MHz acquisition time see note 5;

−−30 ms

BL = 60 kHz IF input signal sensitivity

(RMS value, pins 1 and 2) for PLL still locked see note 6;

− 70 100 µV

maximum IF gain for C/N = 10 dB see note 7 − 100 140 µV FPLL loop offset current at pin 6 see note 8 −−±4.5 µA

-6

November 1992 7

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