Philips TDA9800, TDA9615H Datasheet

INTEGRATED CIRCUITS

DATA SHEET

TDA9800

VIF-PLL demodulator and FM-PLL detector

Preliminary specification			July 1994
File under Integrated Circuits, IC02

Philips Semiconductors	Preliminary specification
VIF-PLL demodulator and FM-PLL detector	TDA9800

FEATURES

∙Suitable for negative vision modulation

∙Applicable for IF frequencies of 38.9 MHz, 45.75 MHz and 58.75 MHz

∙Gain controlled wide band VIF amplifier (AC coupled)

∙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

∙Video amplifier to match sound trap and sound filter

QUICK REFERENCE DATA

∙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 TDA9800 is a monolithic integrated circuit for vision and sound IF signal processing in TV and VTR sets.

SYMBOL	PARAMETER	MIN.	TYP.	MAX.	UNIT
VP	positive supply voltage (pin 20)	4.5	5	8.8	V
IP	supply current	51	60	69	mA
Vi IF	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
Gv	IF gain control	64	70	73	dB
Vo CVBS	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
α0.92/1.1	intermodulation attenuation	56	62	−	dB
α2.76/3.3		56	62	−	dB
αH	suppression of harmonics in video signal	35	40	−	dB
Vo AF	maximum AF output signal for THD < 1.5% (RMS value, pin 9)	0.8	−	−	V
Tamb	operating ambient temperature	−20	−	+70	°C

ORDERING INFORMATION

EXTENDED TYPE			PACKAGE
NUMBER	PINS	PIN POSITION	MATERIAL	CODE
TDA9800	20	DIL	plastic	SOT146(1)
TDA9800T	20	mini-pack	plastic	SOT163A(2)

Note

1.SOT146-1; 1996 December 6.

2.SOT163-1; 1996 December 6.

July 1994

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Philips Semiconductors	Preliminary specification
VIF-PLL demodulator and FM-PLL detector	TDA9800

VP = 5 V (9 V)

2fPC

VP

TPLL

VCO2

VCO1

AFC

20

6

17

16

15

GND

18

INTERNAL

TRAVELLING

AF

9

Vo AF

VCO

AFC

REFERENCE

WAVE

AMPLIFIER

10

CAF

VOLTAGE

DIVIDER

3-STAGE

CAF

Vi VIF1 1

IF-AMPLIFIER

FREQUENCY

IF input

VIDEO

VIDEO

DETECTOR

FM-PLL

DEMODULATOR

AMPLIFIER

Vi VIF2

AND PHASE

2

Vi PC

DETECTOR

CCS

4

TDA9800

sound

mute

TUNER

IF

AGC

BUFFER AND

Vo CVBS

AGC

AGC

DETECTOR

7

NOISE

2 V (p-p)

CLIPPING

3

12

19

5

8

13

14

11

TOP

TAGC

CAGC

MUTE

n.c.

Vo(vid)

Vi(vid)

Vi IC

takeover

CAGC

sound

SOUND

SOUND

point

MUTE

tuner AGC

TRAP

FILTER

video and

output

1 V (p-p)

intercarrier

MED329

Fig.1

Block diagram.

July 1994

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Philips Semiconductors									Preliminary specification
VIF-PLL demodulator and FM-PLL detector									TDA9800
PINNING
SYMBOL		PIN					DESCRIPTION
Vi IF		1		vision IF differential input signal
		2
TADJ		3		tuner AGC take-over adjust (TOP)
φADJ		4		phase detector adjust
MUTE		5		sound mute switch
TPLL		6		PLL time constant of phase detector
Vo CVBS		7		CVBS (positive) output signal
n.c.		8		not connected
Vo AF		9		audio frequency output signal
CAF		10		decoupling capacitor of audio frequency amplifier
Vi IC		11		sound intercarrier input signal
TAGC		12		tuner AGC output
Vo VID		13		video and sound intercarrier output signal
Vi VID		14		video input signal to buffer amplifier
AFC		15		automatic frequency control output
VCO1		16		VCO reference circuit for 2 fPC
VCO2		17
GND		18		ground (0 V)
CAGC		19		AGC capacitor
VP		20		positive supply voltage
			handbook, halfpage						VP
				Vi VIF1	1		20
				Vi VIF2
					2		19		CAGC
				TOP	3		18		GND
				CCS	4		17		VCO2
				MUTE	5		16		VCO1
				TPLL		TDA9800			AFC
					6		15
				Vo CVBS					Vi(vid)
					7		14
				n.c.	8				Vo(vid)
							13
				Vo AF	9				TAGC
							12
				CAF					Vi IC
					10		11
						MED330
				Fig.2	Pin configuration.

July 1994

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Philips Semiconductors	Preliminary specification
VIF-PLL demodulator and FM-PLL detector	TDA9800

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 TDA9800 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. 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. During acquisition the frequency detector produces a DC current which is 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. Via the loop filter the DC current of either frequency detector or phase detector is converted into a DC voltage, which controls the VCO frequency.

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 (fg = 12 MHz) to the video amplifier for suppression of the carrier harmonics.

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 operates 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 output from 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.

By using the sound mute switch (pin 5) the AF amplifier is set to mute state.

July 1994

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Philips Semiconductors			Preliminary specification
VIF-PLL demodulator and FM-PLL detector				TDA9800
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC134).
SYMBOL	PARAMETER	MIN.		MAX.	UNIT
VP	supply voltage (pin 20) for a maximum chip temperature (note 1)
	SOT146 at +120 °C	0		8.8	V
	SOT163A at +100 °C	0		5.5	V
VI	voltage on pins 1, 2, 7, 11, 13, 14, 15 and 19	0		VP	V
ts max	short-circuit time	−		10	s
V12	tuner AGC output voltage	−		13.2	V
Tstg	storage temperature range	−25		+150	°C
VESD	electrostatic handling for all pins (note 2)	−		±300	V

Notes

1.Supply current IP = 69 mA at Tamb = +70 °C.

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

THERMAL RESISTANCE

SYMBOL	PARAMETER	THERMAL RESISTANCE
Rth j-a	from junction to ambient in free air
	SOT146	73 K/W
	SOT163A	85 K/W

July 1994

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Philips Semiconductors	Preliminary specification
VIF-PLL demodulator and FM-PLL detector	TDA9800

CHARACTERISTICS

The following characteristics apply for VP = 5 V; Tamb = +25 °C; see Table 1 for input frequencies and picture to sound ratios; VilF = 10 mV RMS value (sync level); video modulation DSB; residual carrier: 10%; video signal in accordance with CCIR line 17 or NTC-7 Composite; measurements taken in Fig.3 unless otherwise specified

SYMBOL	PARAMETER	CONDITIONS		MIN.	TYP.	MAX.	UNIT
VP	supply voltage (pin 20)	note 1		4.5	5	8.8	V
IP	supply current			51	60	69	mA
Vision IF input (pins 1 and 2)
Vi	input sensitivity (RMS value) at	−1 dB video at output		−	50	90	μV
	38.9 MHz and 45.75 MHz
	input sensitivity (RMS value) at			−	60	100	μV
	58.75 MHz
	maximum input signal (RMS value) at	+1 dB video at output		70	150	−	mV
	38.9 MHz and 45.75 MHz
	maximum input signal (RMS value) at			80	160	−	mV
	58.75 MHz
Vo int.	internal IF amplitude difference	within AGC range;		−	0.7	1	dB
	between picture and sound carrier	B/G:	f = 5.5 MHz;
		M/N:	f = 4.5 MHz
GIF	IF gain control	see Fig.4
		38.9 MHz and		64	70	−	dB
		45.75 MHz
		58.75 MHz		62	68	−	dB
B	−3 dB IF bandwidth	upper cut-off frequency		70	100	−	MHz
Ri	input resistance (differential)			1.7	2.2	2.7	kΩ
Ci	input capacitance (differential)			1.2	1.7	2.5	pF
V1, 2	DC input voltage			3.0	3.4	3.8	V
True synchronous video demodulator		note 2
fVCO	maximum oscillator frequency for	f = 2fPC		125	130	−	MHz
	carrier regeneration
fVCO	oscillator drift (free running) as a	IAFC = 0; note 3		−	−	±20	ppm/K
	function of temperature
Vo ref	oscillator swing at pins 16 and 17	fPC = 38.9 MHz		−	120	−	mV
	(RMS value)	fPC = 45.75 MHz		−	100	−	mV
		fPC = 58.75 MHz		−	80	−	mV
fPC	vision carrier capture range			1.5	2	−	MHz
	(negative)
	vision carrier capture range (positive)			1.5	2	−	MHz
tacqu	acquisition time	BL = 60 kHz; note 4		−	−	30	ms

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