Philips TDA9808T, TDA9808 Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TDA9808

Single standard VIF-PLL with QSS-IF and FM-PLL demodulator

Product speciﬁcation Supersedes data of 1999 Jan 18 File under Integrated Circuits, IC02

1999 Jun 04

Philips Semiconductors Product speciﬁcation

Single standard VIF-PLL with QSS-IF and FM-PLL demodulator

FEATURES

• 5 V supply voltage (9 V supply voltage for TDA9808 (DIP20) only)

• Applicable for IFs (Intermediate Frequencies) of

38.9 MHz, 45.75 MHz and 58.75 MHz

• Gain controlled wide band Video IF (VIF)-amplifier (AC-coupled)

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

• Robustness for over-modulation better than 105% due to Phase Locked Loop (PLL)-bandwidth control at negative modulated standards

• VIF Automatic Gain Control (AGC) detector for gain control, operating as peak sync detector

• Tuner AGC with adjustable TakeOver Point (TOP)

• Automatic Frequency Control (AFC) detector without

extra reference circuit

• AC-coupled limiter amplifier for sound intercarrier signal

• Alignment-free FM-PLL demodulator with high linearity

• Sound IF (SIF) input for single reference Quasi Split

Sound (QSS) mode (PLL controlled); SIF AGC detector for gain controlled SIF amplifier; single reference QSS mixer for high performance

• Electrostatic Discharge (ESD) protection for all pins.

GENERAL DESCRIPTION

The TDA9808 is an integrated circuit for single standard (negative modulated) vision IF signal processing and FM demodulation, with single reference QSS-IF in TV and VTR sets.

TDA9808

ORDERING INFORMATION

TYPE NUMBER

TDA9808 DIP20 TDA9808T SO20

1999 Jun 04 2

NAME DESCRIPTION VERSION

plastic dual in-line package; 20 leads (300 mil) plastic small outline package; 20 leads; body width 7.5 mm

PACKAGE

SOT146-1 SOT163-1

Philips Semiconductors Product speciﬁcation

Single standard VIF-PLL with QSS-IF and

TDA9808

FM-PLL demodulator

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

supply voltage VP= 9 V for TDA9808 (DIP20)

only

i(VIF)(rms)

supply current 71 83 95 mA VIF input signal voltage sensitivity

−1 dB video at output − 60 100 µV

(RMS value)

o(video)(p-p)

video output signal voltage (peak-to-peak value)

−3

S/N

W(video)

−3 dB video bandwidth on pin 9 CL< 30 pF; RL> 1.5 kΩ; AC load 7 8 − MHz weighted signal-to-noise ratio for

video

IM(0.92)

IM(2.76)

H(sup)

intermodulation attenuation at ‘blue’ f = 0.92 MHz 58 64 − dB intermodulation attenuation at ‘blue’ f = 2.76 MHz 58 64 − dB suppression of harmonics in video

signal

i(SIF)(rms)

sound IF input signal voltage

−3 dB at intercarrier output − 50 100 µV

sensitivity (RMS value)

o(rms)

audio output signal voltage for FM (RMS value)

M, N standard;

25 kHz modulation THD total harmonic distortion 25 kHz modulation − 0.15 1.0 % S/N

W(audio)

weighted signal-to-noise ratio 25 kHz modulation; τ =75µs5560−dB

4.5 5 9.9 V

1.2 1.35 1.5 V

56 60 − dB

35 40 − dB

0.4 0.5 0.6 V

1999 Jun 04 3

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1999 Jun 04 4

BLOCK DIAGRAM

Single standard VIF-PLL with QSS-IF and

FM-PLL demodulator

Philips Semiconductors Product speciﬁcation

TAGC

VIF

SAW

SIF

SAW

1 2

19 20

TADJ

TUNER

AGC

VIF

AMPLIFIER

SIF

AMPLIFIER

SIF

AGC

VAGC

VIF

AGC

PLL

FPLL

2 x f

VCO TWD

SINGLE

REFERENCE

QSS MIXER

10 V

o QSS

n.c.

DEMODULATOR AND AMPLIFIER

AFC

DETECTOR

VIDEO

TDA9808

i FM

AFC

13 18815144173 16

VOLTAGE

REFERENCE

NOISE

CLIPPING

FM-PLL

DEMODULATOR

GNDV

o(vid)

1.35 V (p-p)

o AF

711

MHA736

SOUND

TRAP

SAGC

4.5 MHz

Fig.1 Block diagram.

handbook, full pagewidth

mute

switch

DEC

TDA9808

Philips Semiconductors Product speciﬁcation

Single standard VIF-PLL with QSS-IF and FM-PLL demodulator

PINNING

SYMBOL PIN DESCRIPTION

i VIF1

i VIF2

TADJ 3 tuner AGC takeover point adjust T

PLL

SAGC

oAF

DEC

n.c. 8 not connected V

o(vid)

o QSS

1 VIF differential input signal voltage 1 2 VIF differential input signal voltage 2

4 PLL loop ﬁlter 5 SIF AGC capacitor 6 audio output 7 decoupling capacitor

9 composite video output voltage

10 single reference QSS output voltage

TDA9808

SYMBOL PIN DESCRIPTION

iFM

TAGC 12 tuner AGC output AFC 13 AFC output VCO1 14 VCO1 resonance circuit VCO2 15 VCO2 resonance circuit GND 16 ground C

VAGC

i SIF1

i SIF2

11 sound intercarrier input voltage

17 VIF AGC capacitor 18 supply voltage 19 SIF differential input signal voltage 1 20 SIF differential input signal voltage 2

handbook, halfpage

i VIF1

i VIF2

TADJ T

SAGC V

o(vid)

o QSS

PLL

o AF DEC

n.c.

1 2 3 4 5 6 7 8 9

TDA9808

MHA734

i SIF2

i SIF1

VAGC

GND

VCO2

VCO1

AFC

TAGC

i FM

Fig.2 Pin configuration DIP20.

handbook, halfpage

i VIF1

i VIF2

TADJ

SAGC V

o(vid)

o QSS

PLL

o AF DEC

n.c.

1 2 3 4 5

TDA9808T

6 7 8 9

MHA735

i SIF2

i SIF1

VAGC

GND

VCO2

VCO1

AFC

TAGC

i FM

Fig.3 Pin configuration SO20.

1999 Jun 04 5

Philips Semiconductors Product speciﬁcation

Single standard VIF-PLL with QSS-IF and FM-PLL demodulator

FUNCTIONAL DESCRIPTION

The integrated circuit comprises the functional blocks as shown in Fig.1:

1. Vision IF amplifier and VIF AGC detector

2. Tuner AGC

3. Frequency Phase Locked Loop (FPLL) detector

4. Voltage Controlled Oscillator (VCO), Travelling Wave Divider (TWD) and AFC

5. Video demodulator and amplifier

6. SIF amplifier and SIF AGC

7. Single reference QSS mixer

8. FM-PLL demodulator

9. Audio Frequency (AF) signal processing

10. Internal voltage stabilizer.

Vision IF ampliﬁer and VIF AGC detector

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

The AGC detector generates the required VIF gain control voltage for constant video output by charging/discharging the AGC capacitor. Therefore, for negative video modulation the synchronisation level of the video signal is detected.

TDA9808

VCO, Travelling Wave Divider (TWD) and AFC

The VCO operates with a resonance circuit (with L and C in parallel) at double the Picture Carrier (PC) frequency. The VCO is controlled by two integrated variable capacitors. The control voltage required to tune the VCO from its free-running frequency to double the PC frequency is generated by the frequency-phase detector of the FPLL and fed via the loop filter to the first variable capacitor. This control voltage is amplified and additionally converted into a current which represents the AFC output signal. At the centre frequency the AFC output current is equal to zero.

The oscillator signal is divided-by-two with a TWD which generates two differential output signals with a 90 degree phase difference independent of the frequency.

Video demodulator and ampliﬁer

The video demodulator is realized by a multiplier which is designed for low distortion and large bandwidth. The vision IF input signal is multiplied with the ‘in phase’ signal of the travelling wave divider output.

The demodulator output signal is fed to the video amplifier via an integrated low-pass filter for attenuation of the carrier harmonics. The video amplifier is realized by an operational amplifier with internal feedback and high bandwidth. A low-pass filter is integrated to achieve an attenuation of the carrier harmonics. The video output signal at pin V modulation. Noise clipping is provided.

is 1.35 V (p-p) for nominal vision IF

o(vid)

Tuner AGC

The AGC capacitor voltage is converted to an internal IF control signal, and is fed to the tuner AGC to generate the tuner AGC output current at pin TAGC (open-collector output). The tuner AGC takeover point can be adjusted at pin TADJ. This allows to match the tuner to the SAW filter in order to achieve the optimum IF input level.

Frequency Phase Locked Loop (FPLL) detector

The VIF-amplifier output signal is fed into a frequency detector and into a phase detector via a limiting amplifier. During acquisition the frequency detector produces a DC current proportional to the frequency difference between the input and the VCO signal. After frequency lock-in the phase detector produces a DC current proportional to the phase difference between the VCO and the input signal. The DC current of either the frequency detector or the phase detector is converted to a DC voltage via the loop filter, which controls the VCO frequency.

1999 Jun 04 6

SIF ampliﬁer and SIF AGC

The sound IF amplifier consists of two AC-coupled differential amplifier stages. Each differential stage comprises a controlled feedback network provided by emitter degeneration.

The SIF AGC detector is related to the SIF input signal (average level of FM carrier) and controls the SIF amplifier to provide a constant SIF signal to the single reference QSS mixer.

Philips Semiconductors Product speciﬁcation

Single standard VIF-PLL with QSS-IF and FM-PLL demodulator

Single reference QSS mixer

The single reference QSS mixer is realized by a multiplier. The SIF amplifier output signal is fed to the single reference QSS mixer and converted to intercarrier frequency by the regenerated picture carrier (VCO). The mixer output signal is fed via a high-pass filter for attenuation of the video signal components to the output pin 10. With this system a high performance hi-fi stereo sound processing can be achieved.

FM-PLL demodulator

The FM-PLL demodulator consists of a limiter and an FM-PLL. The limiter provides the amplification and limitation of the FM sound intercarrier signal. The result is high sensitivity and AM suppression. The amplifier consists of 7 stages which are internally AC-coupled in order to minimize the DC offset.

Furthermore the AF output signal can be muted by connecting a resistor between the limiter input pin 11 and ground.

The FM-PLL consists of an integrated relaxation oscillator, an integrated loop filter and a phase detector. The oscillator is locked to the FM intercarrier signal, output from the limiter. As a result of locking, the oscillator frequency tracks with the modulation of the input signal and the oscillator control voltage is superimposed by the AF voltage. The FM-PLL operates as an FM demodulator.

TDA9808

AF signal processing

The AF amplifier consists of two parts:

1. The AF pre-amplifier for FM sound is an operational amplifier with internal feedback, high gain and high common mode rejection. The AF voltage from the PLL demodulator, by principle a small output signal, is amplified by approximately 33 dB. The low-pass characteristic of the amplifier reduces the harmonics of the intercarrier signal at the sound output terminal pin 10. An additional DC control circuit is implemented to keep the DC level constant, independent of process spread.

2. The AF output amplifier (10 dB) provides the required output level by a rail-to-rail output stage. This amplifier makes use of an input selector for switching to FM or mute state, controlled by the mute switching voltage.

Internal voltage stabilizer

The bandgap circuit internally generates a voltage of approximately 1.25 V, independent of supply voltage and temperature. A voltage regulator circuit, connected to this voltage, produces a constant voltage of 3.6 V which is used as an internal reference voltage.

1999 Jun 04 7

Philips Semiconductors Product speciﬁcation

Single standard VIF-PLL with QSS-IF and

TDA9808

FM-PLL demodulator

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

s(max)

stg

amb

Notes

1. I

2. Machine model class B (L = 2.5 µH).

supply voltage note 1

j(max)

= 125 °C;

− 9.9 V

TDA9808 (DIP20) T

j(max)

= 115 °C;

− 5.5 V

TDA9808T (SO20) voltage at pins 1, 2, 5, 13, 17, 19 and 20 0 V maximum short-circuit time to ground or V

− 10 s tuner AGC output voltage 0 13.2 V storage temperature −25 +150 °C operating ambient temperature −20 +70 °C electrostatic handling voltage note 2 −300 +300 V

= 95 mA; T

amb

=70°C.

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS VALUE UNIT

th(j-a)

thermal resistance from junction to ambient in free air

TDA9808 (DIP20) 62 K/W TDA9808T (SO20) 85 K/W

1999 Jun 04 8

Philips Semiconductors Product speciﬁcation

Single standard VIF-PLL with QSS-IF and

TDA9808

FM-PLL demodulator

CHARACTERISTICS (9 V SUPPLY, TDA9808; DIP20 only)

VP=9V; T (pins 1 and 2) (sync-level); V transformer 1 : 1; video modulation DSB; residual carrier: 10%; video signal in accordance with measurements taken in Fig.13; unless otherwise speciﬁed.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply (pin 18)

True synchronous video demodulator; note 2 V

i(VIF)(rms)

Composite video ampliﬁer (pin 9; sound carrier off)

o(video)(p-p)

S/N

W(video)

PSRR power supply ripple rejection

=25°C; see Table 1 for input frequencies and carrier ratios; input level V

amb

i(SIF)(rms)

= 4.5 mV (pins 19 and 20) (sound carrier); IF input from 50 Ω via broadband

i(VIF)(rms)

=10mV

“NTC-7 Composite”

supply voltage note 1 4.5 5.0 9.9 V supply current 72 85 98 mA

VIF input signal voltage sensitivity (RMS value)

video output signal voltage

PLL still locked;

− 60 90 µV

maximum IF gain; note 3

see Fig.8 1.27 1.45 1.63 V

(peak-to-peak value) weighted signal-to-noise ratio see Fig.6 and note 4 56 60 − dB

see Fig.11 25 30 − dB

at pin 9

;

Tuner AGC (pin 12)

∆G

IF slip by automatic gain control

tuner gain current from

20 to 80% AFC circuit (pin 13); see Fig.10 and note 5 S control steepness ∆I13/∆f note 6

= 38.9 MHz 0.35 0.55 0.75 µA/kHz

= 45.75 MHz 0.35 0.55 0.75 µA/kHz

= 58.75 MHz 0.35 0.55 0.75 µA/kHz

∆f

/∆T frequency variation by

= 0; note 7 −−±20 × 10−6K

AFC

temperature FM-PLL sound demodulator and AF output (pin 6); note 8 V

o(AF)(6)(rms)

AF output signal voltage

(RMS value)

±25 kHz (50% FM deviation); see Fig.13

S/N

W(audio)

weighted signal-to-noise ratio

“CCIR 468-4”

see Fig.13

α ∆V

mute attenuation 70 75 − dB

DC jump voltage of AF output

FM-PLL in lock mode −±50 ±175 mV

terminal

− 68 dB

−1

375 500 625 mV

;

55 60 − dB

1999 Jun 04 9

Philips Semiconductors Product speciﬁcation

Single standard VIF-PLL with QSS-IF and

TDA9808

FM-PLL demodulator

Notes to the characteristics

1. Values of video and sound parameters are decreased at VP= 4.5 V.

2. Loop bandwidth BL = 70 kHz (natural frequency fn= 12 kHz; damping factor d ≈ 3; calculated with sync level within gain control range). Resonance circuit of VCO: Q0> 50; C

2.7 V).

3. V

4. S/N is the ratio of black to white amplitude to the black level noise voltage (RMS value, pin 9). B = 5 MHz weighted

5. To match the AFC output signal to different tuning systems a current source output is provided (Fig.10).

6. Depending on the ratio ∆C/C0 of the LC resonant circuit of VCO (Q0> 50; see note 2; C0=C

7. Temperature coefficient of external LC-circuit is equal to zero.

8. Input level for second IF from an external generator with 50 Ω source impedance. AC-coupled with 10 nF capacitor,

signal for nominal video signal.

i(VIF)

in accordance with

= 1 kHz, 25 kHz (50% FM deviation) of audio reference. A VIF/SIF input signal is not permitted. Pin 17 has to be

mod

connected to positive supply voltage. S/N and THD measurements are taken at 50 µs (75 µs at M standard) de-emphasis.

“CCIR 567”

at a source impedance of 50 Ω.

: see Table 3; C

ext

≈ 8.5 pF (loop voltage approximately

int

int+Cext

1999 Jun 04 10

Philips Semiconductors Product speciﬁcation

Single standard VIF-PLL with QSS-IF and

TDA9808

FM-PLL demodulator

CHARACTERISTICS (5 V SUPPLY)

=5V; T

(sync-level); V video modulation DSB; residual carrier: 10%; video signal in accordance with in Fig.13; unless otherwise speciﬁed.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply (pin 18)

Vision IF ampliﬁer (pins 1 and 2)

i(rms)

I(max)(rms)

i(VIF)(rms)

∆V

o(int)

IFcr

i(diff)

I(1,2)

True synchronous video demodulator; note 4 f

VCO(max)

/∆T oscillator drift as a function of

∆f

osc

∆f

/∆V

osc

VCO(rms)

cr(pc)

acq

i(IF)(rms)

=25°C; see Table 1 for input frequencies andcarrier ratios; input level V

amb

i(SIF)(rms)

= 4.5 mV (pins 19 and 20) (sound carrier); IF input from 50 Ω via broadband transformer 1 : 1;

supply voltage note 1 4.5 5 5.5 V supply current 71 83 95 mA

allowable overload input

note 2 −−440 mV

voltage (RMS value) maximum input signal voltage

(RMS value) VIF input signal voltage

sensitivity (RMS value) internal IF amplitude

difference between picture and sound carrier

+1 dB video at output; see Fig.4

−1 dB video at output; see Fig.4

within AGC range; M standard;

∆f = 4.5 MHz IF gain control range see Fig.4 65 70 − dB differential input resistance note 3 1.7 2.2 2.7 kΩ differential input capacitance note 3 1.2 1.7 2.5 pF DC input voltage note 3 − 3.4 − V

maximum oscillator frequency

f=2f

for carrier regeneration

oscillator is temperature

free-running; I

AFC

=0;

note 5

oscillator shift as a function of supply voltage

oscillator is

free-running; note 5 oscillator voltage swing at

pins 14 and 15 (RMS value) picture carrier capture range ±1.4 ±1.8 − MHz acquisition time BL = 70 kHz; note 6 −−30 ms IF input signal voltage

sensitivity for PLL to be locked

maximum IF gain;

note 7 (RMS value; pins 1 and 2)

i(VIF)(rms)

“NTC-7 Composite”

= 10 mV (pins 1 and 2)

; measurements taken

−−140 mV

− 60 100 µV

− 0.7 1 dB

125 130 − MHz

−−±20 × 10

−6

−−±1500 × 10−6V

50 80 110 mV

− 60 90 µV

−1

1999 Jun 04 11

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