Sanyo LA7955 Specifications

Ordering number : ENN2740B

Monolithic Linear IC

LA7955

Video Switch for TV / VCR Use

Overview

The LA7955 Video Switch IC is used to switch the video and audio signals of TVs, VCRs and similar equipment. Separate pin layouts for the video and audio systems facilitate board design. Tow signals can be selected from the three input signals in a symmetrical arrangement using a control signal. Law impedance lines (VCC, GND and control input) between the input and output pins minimize crosstalk caused by the high frequency of the video section. The LA7955 operates on a 12V power supply and is available in 20-pin plastic slim DIPs.

Functions

•Video applications : 3 inputs, 2 outputs

•Audio applications : 3 inputs, 2 outputs × 2 (L, R) channels

•Built-in muting circuits for 2 left and right audio output channels

Package Dimensions

unit : mm

3021B-DIP20
			[LA7955]
	20		11
			7.62	6.4
				0.25
	1		10
			24.2
			3.25	3.9max
				3.3
0.67	2.54	0.5	1.2
				SANYO: DIP20

Features

•Separate video and audio pin layouts

•Built-in 6dB video amps

•Wideband characteristics

•Minimal video and audio crosstalk

•12V power supply

•20-pin plastic slim DIP

Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

D2599TH (OT)/N1892TH/7110TS/6028MO, TS No. 2740-1/6

LA7955

Specifications

Maximum Ratings at Ta = 25°C

Parameter	Symbol		Conditions			Ratings				Unit
Maximum Supply Voltage	V6max						14.4			V
	V4max
Maximum Control Signal Voltage	V8max						14.4			V
	V10max
Allowable Power Dissipation	Pd max		Ta ≤ 70°C				700			mW
Operating Temperature	Topr						–20 to +70			°C
Storage Temperature	Tstg					–55 to +125				°C
Operating Conditions at Ta = 25°C
Parameter	Symbol		Conditions			Ratings				Unit
Recommended Supply Voltage	VCC						12			V
Operating Supply Voltage Range	VCC op							8 to 13.2		Vs
Operating Characteristics at Ta = 25°C, VCC = 12V
Parameter	Symbol		Conditions			Ratings				Unit
				min		typ		max
Quiescent Current	ICC			35		43		57		mA
Video Input Bias Voltage	V1, V3, V7			4.4		4.7		5.0		V
Video Output Bias Voltage	V5, V9			6.2		6.8		7.4		V
Video Input Impedance	Z1, Z3, Z7		f = 1 kHz	15		21		27		kΩ
Video Output Impedance	Z5, Z9		f = 1 kHz			42				Ω
Video Voltage Gain	GVV		Vin = 1 Vp-p (sine wave), f = 0.1 MHz	5.6		6.1		6.6		dB
Video Frequency Bandwidth	BWV		Vin = 0.7 Vp-p (sine wave), –3 dB band for 0.1 MHz	10						MHz
Output Noise Voltage	VnV		Rg = 75 Ω , 10 MHz band			0.3		1.0		mVrms
Video Crosstalk (between inputs 1 and 2)	CTV1		Rg = 75 Ω , f = 3.58 MHz	45		50				dB
Video Crosstalk (between inputs 1/2 and 3)	CTV2		Rg = 75 Ω , f = 3.58 MHz	45		50				dB
Video Output Hum Rejection	HRV		f = 50 Hz, Rg = 75 Ω	18		23				dB
	V12, V13,
Audio Input Bias Voltage	V14, V17,			4.5		5.1		5.7		V
	V18, V19
Audio Output Bias Voltage	V11, V15,			3.2		3.8		4.4		V
	V18, V20
Audio Input Impedance (inputs 1 and 2)	Z12, Z13,		f = 1 kHz	47		68		88		kΩ
	Z15, Z19
Audio Input Impedance (input 3)	Z14, Z17		f = 1 kHz	51		74		95		kΩ
Audio Output Impedance	Z11, Z15,					75				Ω
	Z16, Z20
Audio Voltage Gain	GVA		f = 1 kHz, Vin = 500 mVrms	–0.5		–0.02		+0.5		dB
Audio Frequency Bandwidth	BWA		–1 dB band (Vin = 500 mVrms) for f = 1 kHz gain	100						kHz
Total Harmonic Distortion	THD		f = 1 kHz, Vin = 500 mVrms			0.03		0.2		%
Output Noise Voltage	VnA		Rg = 600 Ω , 20 Hz to 20 kHz bandwidth			10		50		µVrms
Audio Crosstalk (between inputs 1 and 2)	CTA1		Rg = less than 4.7 kΩ , f = 1 kHz (Vin = 500 mVrms)	75		90				dB
Audio Crosstalk (between inputs 1/2 and 3)	CTA2		Rg = less than 4.7 kΩ , f = 1 kHz (Vin = 500 mVrms)	75		90				dB
Audio Crosstalk (between L and R channels)	CTAS		Rg = 4.7 kΩ , f = 1 kHz (Vin = 500 mVrms)	72		82				dB
Mute Noise	VOAM		f = 1 kHz, Vin = 500 mVrms			0.02		0.1		mVrms
Audio Hum Rejection 1	HR1		Input Rg = 4.7 kΩ	40		46				dB
Audio Hum Rejection 2	HR2		Input open	28		39				dB
Switching Control Signal Input High Threshold Voltage	V4TH, V8TH			1.1		1.4		1.7		V
Switching Control Signal Input Leak Current	I4L, I8L							–3		µA
Mute Input High Threshold Voltage	V10TH			1.1		1.4		1.7		V
Mute Input Leak Current	I10L							–3		µA

Note: The current flowing to the IC is positive and current from the IC is negative.

No. 2740-2/6