Sanyo LA7156 Specifications
Ordering number : EN4702
22895TH (OT) No. 4702-1/8
Overview
The LA7156 is a switching IC for use with the PAL and
SECAM 21-pin connector interface. The LA7156
integrates video and audio switches in a single chip, and
allows significant block reorganization and integration by
providing function switching outputs with current limiters,
75 Ω video drivers, muting and other functions. The
LA7156 provides a diverse set of functions, including
support for single-wire serial bus control that allows
complex logic to be handled by microprocessor software.
Functions and Features
• Three audio and three video switching systems
• Audio output and video decoder output muting function
• Video input sync chip clamp
• Two 6 dB video amplifier plus 75 Ω driver systems
• VPS decoder output
• FSS output with current limiting
• 5 V regulator built-in
• Serial control
Package Dimensions
unit: mm
3067-DIP24S
SANYO: DIP24S
[LA7156]
LA7156
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Video and Audio Switch for
PAL-SECAM 21-Pin Interface
Monolithic Linear IC
Specifications
Absolute Maximum Ratings at Ta = 25°C
Operating Conditions at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
CC
max 15 V
Allowable power dissipation Pd max Ta ≤ 65°C 800 mW
Operating temperature Topr –20 to +65 °C
Storage temperature Tstg –55 to +150 °C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
CC
9, 12 V
Operating supply voltage range V
CC
op 8 to 13 V
Operating Characteristics at Ta = 25°C, VCC= 9 V and 12 V
Note: In the operating characteristics listed above, characteristics items that do not differ between VCC= 9 V and 12 V are listed as the same item.
1. Forced to low when pin 2 is open.
2. Forced to the middle level when pin 20 is open.
No. 4702-2/8
LA7156
Parameter Symbol Conditions min typ max Unit
Current drain I
CC
No input 32 40 48 mA
FSS output high level voltage 1 VHFSS1 V
CC
= 9 V, load resistance: 10 kΩ 7.5 8.9 9.0 V
FSS output low level voltage 1 VLFSS1 V
CC
= 9 V, load resistance: 10 kΩ 0 0.5 V
FSS output high level voltage 2 VHFSS2 V
CC
= 12 V, load resistance: 10 kΩ 10.5 11.9 12.0 V
FSS output low level voltage 2 VLFSS2 V
CC
= 12 V, load resistance: 10 kΩ 0 0.5 V
FSS output cutoff current 1 I
CUTOFF
1
V
CC
= 9 V, the outflow current
9.3 40.0 mA
when the FSS output is grounded
FSS output cutoff current 2 I
CUTOFF
2
V
CC
= 12 V, the outflow current
9.8 40.0 mA
when the FSS output is grounded
[Audio Switch Block]
Total harmonic distortion THD V
IN
= 1 Vrms, f = 1 kHz, R
OUT
= ∞ 0.02 1 %
Maximum output voltage V
O
max The output level when f = 1 kHz and THD = 2% 2 3 Vrms
Output noise voltage V
NO
Rg = 600 Ω, DIN audio filter –100 –90 dBV
Voltage gain A VG
A
The TP6 and TP8 output levels
1.1 1.8 2.5 dB
when V
IN
= 1 Vrms and f = 1 kHz
Interchannel crosstalk A CTA V
IN
= 1 Vrms, f = 1 kHz –90 –70 dB
Muting attenuation A VmuteA V
IN
= 1 Vrms, f = 1 kHz –90 –70 dB
Output offset voltage Vof The offset voltage when the switch has changed state 0 20 mV
Input impedance A Z
IN
A405060kΩ
[Video Switch Block]
Voltage gain V VG
V
The TP2 and TP5 output levels
–10+1dB
when V
IN
= 1 Vp-p and f = 4.43 MHz
Frequency characteristics Vf V
IN
= 1 Vp-p, f = 100 k/7 MHz –1.5 –0.5 +0.5 dB
Second harmonic H2 V
IN
= 1 Vp-p, f = 4.43 MHz –45 –40 dB
Third harmonic H3 V
IN
= 1 Vp-p, f = 4.43 MHz –50 –45 dB
Interchannel crosstalk V CTV V
IN
= 1 Vp-p, f = 4.43 MHz –50 –40 dB
Muting attenuation V VmuteV V
IN
= 1 Vp-p, f = 4.43 MHz –50 –40 dB
Output voltage V
OUT
The TP5 DC voltage with no input 0.7 1.0 V
[Control Block]
Serial control input high level Vsh 4 5 V
Serial control input middle level Vsm 2 3 V
Serial control input low level Vsl 0 1 V
Pin 2 input high level V2H 4 V
CC
V
Pin 2 input low level V2L *102V
Pin 20 input high level V20H 4 V
CC
V
Pin 20 input middle level V20M *223V
Pin 20 input low level V20L 0 1 V
Pin 7 output high level V7H The TP9 DC voltage when SW3 is in the A position 4.5 5.0 5.5 V
Pin 7 output low level V7L The TP9 DC voltage when SW3 is in the B position 0 1 V
Timing Characteristics
Serial Control Input Specifications
LA7156 Command Address
No. 4702-3/8
LA7156
Parameter Symbol Conditions min typ max Unit
Minimum input pulse width t
W
2µs
Rise time tr 20 µs
Fall time tf 20 µs
Address A1 A2 A3 A4
State L H H L
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