SANYO LA7642N Datasheet

Ordering number : EN5693

Monolithic Linear IC

LA7642N

SECAM Format Color TV Chrominance Circuit

Overview

The LA7642N integrates the chrominance circuit for a SECAM format TV in a single 16-pin DIP (300 mil) package and provides an adjustment-free discriminator circuit. In combination with the Sanyo LA7687, LA7688, this IC can implement a multi-format color TV signalprocessing system.

Features

•Adjustment-free discriminator circuit

•On-chip bell filter

Package Dimensions

unit: mm

3006B-DIP16

[LA7642N]

SANYO: DIP16

Specifications

Maximum Ratings at Ta = 25°C

Parameter	Symbol	Conditions	Ratings	Unit
Maximum supply voltage	VCC max		9	V
Allowable power dissipation	Pd max	Ta ≤ 65°C	400	mW
Operating temperature	Topr		–10 to +65	°C
Storage temperature	Tstg		–55 to +125	°C

Operating Conditions at Ta = 25°C

Parameter	Symbol	Conditions	Ratings	Unit
Recommended operating voltage	VCC		7.8	V
Operating voltage range	VCC op		7.0 to 8.5	V

Operating Characteristics at Ta = 25°C, VCC = 7.8 V, with pin 13 pulled up to VCC through a 20-kΩ resistor

	Parameter	Symbol	Conditions		Ratings		Unit
				min	typ	max
	[Circuit Voltage and Current]
			Chrominance system. Measure the current
	Circuit current	ICC	flowing into pin 15; With no signal applied to	28	35	42	mA
			pin 14.
	[Filter Block]
	Input impedance		The pin 14 input impedance. For reference		15		kΩ
			only (design value)

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LA7642N

Continued from preceding page.

	Parameter	Symbol	Conditions		Ratings		Unit
				min	typ	max
			Referenced to 4.286 MHz. For reference only.
			EQU = off.
			Input a 20 mV p-p, f = 4.286 MHz CW signal
	Bell filter frequency characteristics	BEL4.086	to pin 14 and, measure the pin 16 output	–9	–6	–3	dB
	4.086 MHz		(f = 4.286 MHz). Next, input a CW of
			20 mV p-p, f = 4.086 MHz and measure the
			pin 16 output (f = 4.086 MHz) and calculate
			the frequency characteristics.
			Referenced to 4.286 MHz. For reference only.
			EQU = off.
			Input a 20 mV p-p, f = 4.286 MHz CW signal
	Bell filter frequency characteristics	BEL4.486	to pin 14 and, measure the pin 16 output	–5	–2	–0.5	dB
	4.486 MHz		(f = 4.286 MHz). Next, input a CW of
			20 mV p-p, f = 4.486 MHz and measure the
			pin 16 output (f = 4.486 MHz) and calculate
			the frequency characteristics.
			Referenced to 4.286 MHz. For reference only.
			EQU = on.
			Input a 20 mV p-p, f = 4.286 MHz CW signal
	EQU frequency characteristics	EQU4.086	to pin 14 and, measure the pin 16 output	–10.5	–7.5	–4.5	dB
	4.086 MHz		(f = 4.286 MHz). Next, input a CW of
			20 mV p-p, f = 4.086 MHz and measure the
			pin 16 output (f = 4.086 MHz) and calculate
			the frequency characteristics.
			Referenced to 4.286 MHz. For reference only.
			EQU = on.
			Input a 20 mV p-p, f = 4.286 MHz CW signal
	EQU frequency characteristics	EQU4.486	to pin 14 and measure the pin 16 output	–3	0	+3	dB
	4.486 MHz		(f = 4.286 MHz). Next, input a CW of
			20 mV p-p, f = 4.486 MHz and measure the
			pin 16 output (f = 4.486 MHz) and calculate
			the frequency characteristics.
			Referenced to 4.35 MHz. For reference only.
			EQU = off.
			Input a 20 mV p-p CW signal to pin 14 and
	Bell filter frequency deviation from	BELF0	modify the frequency of that signal. Measure	–50	0	+50	kHz
	center frequency		the deviation from 4.35 MHz of the frequency
			(the center frequency) for which the pin 16
			output is maximized.
			Referenced to 4.35 MHz. For reference only.
	Bell filter gain difference at f0 ±500 kHz	BELdG	EQU = off.	–1	0	+1	dB
			Measure the gain at the BELF0 ±500 kHz,
			and calculate the difference.
	[Chrominance Block]
			Let 0 dB = 200 mV p-p. Input a color bar
			signal to pin 14 and gradually lower the input
	Killer operating point	KILL	signal level. Measure the input level at the	–42	–36	–33	dB
			point the pin 13 DC voltage falls below 1/2*
			VCC.
			The pin 7 B-Y amplitude for a color bar signal.
	B-Y output amplitude	VBY	Let 0 dB = 200 mV p-p. Input a color bar	0.60	0.75	0.90	Vp-p
			signal (0 dB) to pin 14, and measure the B-Y
			amplitude at pin 7.
			The pin 6 R-Y amplitude for a color bar signal.
	R-Y output amplitude	VRY	Let 0 dB = 200 mV p-p. Input a color bar	0.74	0.92	1.10	Vp-p
			signal (0 dB) to pin 14, and measure the R-Y
			amplitude at pin 6.
			VRY/VBY. Calculate the ratio of the values
	R-Y/B-Y output ratio	RATRB	measured above.	1.1	1.23	1.35
			RATRB = VRY/VBY
			Input a color bar signal (0 dB) to pin 14. In the
			pin 7 (B-Y) output waveform measure the
			amplitude of the blue (+230 kHz) and yellow
	B-Y linearity	LINBY	(–230 kHz) components (A) and measure the	85	100	115	%
			amplitude of the blue green (+78 kHz) and
			red (–78 kHz) components (B). Calculate the
			value of LINBY from the following formula.
			LINBY = (A/B) × (156/460) × 100 (%)

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