Philips TDA9808T, TDA9808 Datasheet

INTEGRATED CIRCUITS

DATA SHEET

TDA9808

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

Product specification

1999 Jun 04

Supersedes data of 1999 Jan 18

File under Integrated Circuits, IC02

Philips Semiconductors	Product specification

Single standard VIF-PLL with QSS-IF and

TDA9808

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.

ORDERING INFORMATION

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.

	TYPE NUMBER		PACKAGE
		NAME	DESCRIPTION	VERSION
	TDA9808	DIP20	plastic dual in-line package; 20 leads (300 mil)	SOT146-1
	TDA9808T	SO20	plastic small outline package; 20 leads; body width 7.5 mm	SOT163-1

1999 Jun 04

2

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
VP	supply voltage	VP = 9 V for TDA9808 (DIP20)	4.5	5	9.9	V
		only
IP	supply current		71	83	95	mA
Vi(VIF)(rms)	VIF input signal voltage sensitivity	−1 dB video at output	−	60	100	μV
	(RMS value)
Vo(video)(p-p)	video output signal voltage		1.2	1.35	1.5	V
	(peak-to-peak value)
B−3	−3 dB video bandwidth on pin 9	CL < 30 pF; RL > 1.5 kΩ; AC load	7	8	−	MHz
S/NW(video)	weighted signal-to-noise ratio for		56	60	−	dB
	video
αIM(0.92)	intermodulation attenuation at ‘blue’	f = 0.92 MHz	58	64	−	dB
αIM(2.76)	intermodulation attenuation at ‘blue’	f = 2.76 MHz	58	64	−	dB
αH(sup)	suppression of harmonics in video		35	40	−	dB
	signal
Vi(SIF)(rms)	sound IF input signal voltage	−3 dB at intercarrier output	−	50	100	μV
	sensitivity (RMS value)
Vo(rms)	audio output signal voltage for FM	M, N standard;	0.4	0.5	0.6	V
	(RMS value)	25 kHz modulation
THD	total harmonic distortion	25 kHz modulation	−	0.15	1.0	%
S/NW(audio)	weighted signal-to-noise ratio	25 kHz modulation; τ = 75 μs	55	60	−	dB

1999 Jun 04

3

_

04 Jun 1999

TADJ

CVAGC

TPLL

2 x fpc

DIAGRAM BLOCK

demodulator PLL-FM

PLL-VIF standard Single

Semiconductors Philips

AFC

VP

GND

n.c.

3

17

4

14

15

8

13

18

16

AFC

VOLTAGE

12

TUNER

VIF

DETECTOR

REFERENCE

TAGC

AGC

AGC

with

1

Vo(vid)

VIDEO

-QSS

VIF

VIF

VCO

NOISE

9

1.35 V (p-p)

SOUND

2

FPLL

DEMODULATOR

SAW

AMPLIFIER

TWD

CLIPPING

TRAP

AND AMPLIFIER

Vo AF

6

IF

4

19

SINGLE

and

SIF

SIF

20

REFERENCE

TDA9808

SAW

AMPLIFIER

QSS MIXER

SIF

FM-PLL

DEMODULATOR

AGC

5

10

11

7

MHA736

Vo QSS

Vi FM

4.5 MHz

CSAGC

CDEC

mute

TDA9808

specification Product

full pagewidth

switch

Fig.1

Block diagram.

handbook,

Philips Semiconductors	Product specification

Single standard VIF-PLL with QSS-IF and

TDA9808

FM-PLL demodulator

PINNING

SYMBOL	PIN	DESCRIPTION
Vi VIF1	1	VIF differential input signal voltage 1
Vi VIF2	2	VIF differential input signal voltage 2
TADJ	3	tuner AGC takeover point adjust
TPLL	4	PLL loop filter
CSAGC	5	SIF AGC capacitor
Vo AF	6	audio output
CDEC	7	decoupling capacitor
n.c.	8	not connected
Vo(vid)	9	composite video output voltage
Vo QSS	10	single reference QSS output voltage

SYMBOL	PIN	DESCRIPTION
Vi FM	11	sound intercarrier input voltage
TAGC	12	tuner AGC output
AFC	13	AFC output
VCO1	14	VCO1 resonance circuit
VCO2	15	VCO2 resonance circuit
GND	16	ground
CVAGC	17	VIF AGC capacitor
VP	18	supply voltage
Vi SIF1	19	SIF differential input signal voltage 1
Vi SIF2	20	SIF differential input signal voltage 2

handbook, halfpage				Vi SIF2	handbook, halfpage						Vi SIF2
Vi VIF1	1		20		Vi VIF1	1				20
Vi VIF2				Vi SIF1	Vi VIF2						Vi SIF1
	2		19			2				19
TADJ				VP	TADJ						VP
	3		18			3				18
TPLL				CVAGC	TPLL						CVAGC
	4		17			4				17
CSAGC				GND	CSAGC						GND
	5	TDA9808	16			5			TDA9808T	16
Vo AF				VCO2	Vo AF						VCO2
	6		15			6				15
CDEC				VCO1	CDEC						VCO1
	7		14			7				14
n.c.				AFC	n.c.						AFC
	8		13			8				13
Vo(vid)				TAGC	Vo(vid)						TAGC
	9		12			9				12
Vo QSS				Vi FM	Vo QSS						Vi FM
	10		11			10				11
		MHA734							MHA735

Fig.2 Pin configuration DIP20.

Fig.3 Pin configuration SO20.

1999 Jun 04

5

Philips Semiconductors	Product specification

Single standard VIF-PLL with QSS-IF and

TDA9808

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.

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.

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 Vo(vid) is 1.35 V (p-p) for nominal vision IF modulation. Noise clipping is provided.

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.

1999 Jun 04

6

Philips Semiconductors	Product specification

Single standard VIF-PLL with QSS-IF and

TDA9808

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.

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
VP	supply voltage	note 1
		Tj(max) = 125 °C;	−	9.9	V
		TDA9808 (DIP20)
		Tj(max) = 115 °C;	−	5.5	V
		TDA9808T (SO20)
Vi	voltage at pins 1, 2, 5, 13, 17, 19 and 20		0	VP	V
ts(max)	maximum short-circuit time to ground or VP		−	10	s
V12	tuner AGC output voltage		0	13.2	V
Tstg	storage temperature		−25	+150	°C
Tamb	operating ambient temperature		−20	+70	°C
Ves	electrostatic handling voltage	note 2	−300	+300	V

Notes

1.IP = 95 mA; Tamb = 70 °C.

2.Machine model class B (L = 2.5 μH).

THERMAL CHARACTERISTICS

SYMBOL	PARAMETER	CONDITIONS	VALUE	UNIT
Rth(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 = 9 V; Tamb = 25 °C; see Table 1 for input frequencies and carrier ratios; input level Vi(VIF)(rms) = 10 mV

(pins 1 and 2) (sync-level); Vi(SIF)(rms) = 4.5 mV (pins 19 and 20) (sound carrier); IF input from 50 Ω via broadband transformer 1 : 1; video modulation DSB; residual carrier: 10%; video signal in accordance with “NTC-7 Composite”;

measurements taken in Fig.13; unless otherwise specified.

SYMBOL	PARAMETER			CONDITIONS	MIN.	TYP.	MAX.	UNIT
Supply (pin 18)
VP	supply voltage	note 1			4.5	5.0	9.9	V
IP	supply current				72	85	98	mA
True synchronous video demodulator; note 2
Vi(VIF)(rms)	VIF input signal voltage	PLL still locked;			−	60	90	μV
	sensitivity (RMS value)	maximum IF gain; note 3
Composite video amplifier (pin 9; sound carrier off)
Vo(video)(p-p)	video output signal voltage	see Fig.8			1.27	1.45	1.63	V
	(peak-to-peak value)
S/NW(video)	weighted signal-to-noise ratio	see Fig.6 and note 4			56	60	−	dB
PSRR	power supply ripple rejection	see Fig.11			25	30	−	dB
	at pin 9
Tuner AGC (pin 12)
GIF	IF slip by automatic gain	tuner gain current from			−	6	8	dB
	control	20 to 80%
AFC circuit (pin 13); see Fig.10 and note 5
S	control steepness I13/ f	note 6
			fpc = 38.9 MHz		0.35	0.55	0.75	μA/kHz
			fpc = 45.75 MHz		0.35	0.55	0.75	μA/kHz
			fpc = 58.75 MHz		0.35	0.55	0.75	μA/kHz
f / T	frequency variation by	I	AFC	= 0; note 7	−	−	±20 × 10−6	K−1
IF	temperature
FM-PLL sound demodulator and AF output (pin 6); note 8
Vo(AF)(6)(rms)	AF output signal voltage	±25 kHz			375	500	625	mV
	(RMS value)	(50% FM deviation);
		see Fig.13
S/NW(audio)	weighted signal-to-noise ratio	“CCIR 468-4”;			55	60	−	dB
		see Fig.13
α6	mute attenuation				70	75	−	dB
V5	DC jump voltage of AF output	FM-PLL in lock mode			−	±50	±175	mV
	terminal

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; Cext: see Table 3; Cint ≈ 8.5 pF (loop voltage approximately 2.7 V).

3.Vi(VIF) signal for nominal video signal.

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 in accordance with “CCIR 567” at a source impedance of 50 Ω.

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 = Cint + Cext).

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,

fmod = 1 kHz, 25 kHz (50% FM deviation) of audio reference. A VIF/SIF input signal is not permitted. Pin 17 has to be connected to positive supply voltage. S/N and THD measurements are taken at 50 μs (75 μs at M standard) de-emphasis.

1999 Jun 04

10

Philips Semiconductors	Product specification

Single standard VIF-PLL with QSS-IF and

TDA9808

FM-PLL demodulator

CHARACTERISTICS (5 V SUPPLY)

VP = 5 V; Tamb = 25 °C; see Table 1 for input frequencies and carrier ratios; input level Vi(VIF)(rms) = 10 mV (pins 1 and 2) (sync-level); Vi(SIF)(rms) = 4.5 mV (pins 19 and 20) (sound carrier); IF input from 50 Ω via broadband transformer 1 : 1; video modulation DSB; residual carrier: 10%; video signal in accordance with “NTC-7 Composite”; measurements taken in Fig.13; unless otherwise specified.

	SYMBOL				PARAMETER		CONDITIONS	MIN.	TYP.	MAX.	UNIT
Supply (pin 18)
VP					supply voltage		note 1	4.5	5	5.5	V
IP					supply current			71	83	95	mA
Vision IF amplifier (pins 1 and 2)
Vi(rms)					allowable overload input		note 2	−	−	440	mV
					voltage (RMS value)
VI(max)(rms)					maximum input signal voltage		+1 dB video at output;	−	−	140	mV
					(RMS value)		see Fig.4
Vi(VIF)(rms)					VIF input signal voltage		−1 dB video at output;	−	60	100	μV
					sensitivity (RMS value)		see Fig.4
Vo(int)					internal IF amplitude		within AGC range;	−	0.7	1	dB
					difference between picture		M standard;
					and sound carrier		f = 4.5 MHz
GIFcr					IF gain control range		see Fig.4	65	70	−	dB
Ri(diff)					differential input resistance		note 3	1.7	2.2	2.7	kΩ
Ci(diff)					differential input capacitance		note 3	1.2	1.7	2.5	pF
VI(1,2)					DC input voltage		note 3	−	3.4	−	V
True synchronous video demodulator; note 4
fVCO(max)					maximum oscillator frequency		f = 2fpc	125	130	−	MHz
					for carrier regeneration
f	osc	/	T		oscillator drift as a function of		oscillator is	−	−	±20 × 10−6	K−1
					temperature		free-running; IAFC = 0;
							note 5
f	osc	/	V	P	oscillator shift as a function of		oscillator is	−	−	±1500 × 10−6	V−1
					supply voltage		free-running; note 5
VVCO(rms)					oscillator voltage swing at			50	80	110	mV
					pins 14 and 15 (RMS value)
fcr(pc)					picture carrier capture range			±1.4	±1.8	−	MHz
tacq					acquisition time		BL = 70 kHz; note 6	−	−	30	ms
Vi(IF)(rms)					IF input signal voltage		maximum IF gain;	−	60	90	μV
					sensitivity for PLL to be locked		note 7
					(RMS value; pins 1 and 2)

1999 Jun 04

11