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Ordering number : EN5654
Monolithic Linear IC
LA7357
PAL/SECAM Discrimination Circuit for VHS VCRs
Overview
The LA7357 can be used as a PAL/SECAM discrimination IC. Since no ceramic resonator or tank circuit is required, only a small number of external components are used, and the LA7357 can contribute to reduced mounting areas and lower system costs.
Package Dimension
unit: mm 3098B-DIP10S
[LA7357]
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Ta 65 C Conditions
SANYO: DIP10S
Ratings 7.0 120 -10 to +65 -40 to +125 Unit V mW C C
Operating Conditions at Ta = 25C
Parameter Supply voltage Operating voltage range Symbol VCC VCC op Conditions Ratings 5.0 4.8 to 5.5 Unit V V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
73097HA(OT) No. 5654-1/6
LA7357 Operating Characteristics at Ta = 25C, VCC = 5 V
Parameter Symbol ICC1 ICC2 Conditions Pin 5 = ground, pin 7 influx current: T4 output Pin 5 = VCC, pin 7 influx current: T4 output The pin 5 voltage when the pin 2 output appears when slowly raising the voltage applied to pin 5 from 0 V. The input signal should be 300 mVp-p: T2 output The pin 5 voltage when the pin 2 output appears when slowly lowering the voltage applied to pin 5 from 5 V. The input signal should be 300 mVp-p: T2 output Stipulated as the output ratio when a 10 mVp-p amplitude sine wave is input to pin 1: T2 output Measure the output amplitude when a 300 mVp-p amplitude sine wave is input to pin 1: T2 output The V1 level when T1 switches from low to high when slowly raising V1 from 0 V: T1 output The V1 level when T1 switches from high to low when slowly lowering V1 from 5 V: T1 output With a 2-k load: T1 output With a 2-k load: T1 output Ratings min 7.0 7.5 typ 10.0 10.5 max 13.0 13.5 Unit mA mA
Current drain
BGP threshold level
BTH
2.2
2.5
2.8
V
SYNC threshold level
STH
0.6
0.8
1.0
V
Input limiter amplifier gain
LIMG
9
12
15
dB
Input limiter amplifier level
LIMD
150
190
230
mVp-p
Comparator hysteresis high-level voltage
Comp H
2.7
3.0
3.3
V
Comparator hysteresis low-level voltage DET-OUT output high-level voltage DET-OUT output low-level voltage
Comp L DETH DETL
2.0 3.6 0
2.3 4.0 0.2
2.6 4.4 0.4
V V V
Switching Conditions
Input signal Symbol ICC1 ICC2 BTH STH LIMG LIMD Comp H Comp L DETH DETL S1 No signal No signal Sig.1 No signal Sig.1 Sig.1 No signal No signal Sig.2 Sig.3 S2 No signal No signal No signal1 Sig.1 No signal No signal No signal No signal Sig.1 Sig.1 S3 0V 5V 0V 0V 5V 5V No signal No signal P2 P2 Input pulse S4 0V 5V 0V 0V 0V 0V No signal No signal P1 P1 Variable DC level Variable DC level Variable DC level Variable DC level Applied voltage V1 V2 SW1 Off Off On On On On Off Off Off Off Switch states SW2 Off Off Off Off Off Off On On Off Off SW3 Off Off On On Off Off Off Off Off Off SW4 Off Off Off Off Off Off Off Off Off Off SW5 Off Off Off Off Off On On On On On
No. 5654-2/6
LA7357 Block Diagram
Test Circuit
No. 5654-3/6
LA7357 Pin Functions
Pin No. Pin Pin Functions Equivalent circuit
1
CHROMA-IN
* Chrominance signal input. This pin can handle burst (or unmodulated carrier for SECAM input) signal amplitudes of between 50 and 800 mVp-p.
2
HPF.MONI
* High-pass filter output monitor To avoid interference between pin 1 and pin 3, this pin should be connected to VCC during normal operation.
3
FILTER
* Phase comparator output This signal is smoothed with an external capacitor. The smoothed level will be: 2.0 V or lower for PAL 3.5 V or higher for SECAM or MESECAM.
4
GND
5
* BGP + SYNC input The input level is a 1.0- to 2.0-V rising pulse ( ) during the SYNC period, and a 3.0- to 4.5-V rising pulse ( ) during the BGP period. Note that since SYNC+BGP a combined BGP and C.SYNC pulse ( ) is output from the Y/C IC when the LA7357 is used in combination with a Sanyo single-chip Y/C IC (any one of the LA7430, LA7435, or LA71520) no external component will be required on pin 5.
6
DET-ADJ
* Discrimination sensitivity adjustment pin The discrimination is shifted towards PAL as the pin voltage is increased, and towards SECAM as the pin voltage is lowered. This pin is normally left open.
7
VCC
Continued on next page.
No. 5654-4/6
LA7357
Continued from preceding page.
Pin No. Pin Pin Functions Equivalent circuit
8
FSC-IN
* PAL fsc (4.43 MHZ) input This pin can handle inputs with amplitude between about 300 and 800 mVp-p.
9
AFP.MONI
* APF output monitor This pin must be connected to VCC to prevent interference between pins 8 and 10.
10
DET-OUT
* Discrimination output This pin outputs a high level (4.2 V) for SECAM or MESECAM inputs, and a low level (close to 0 V) for PAL inputs.
No. 5654-5/6
LA7357 Test Input Signals and Pulses
fsc sine wave
SECAM color bar signal
PAL color bar signal
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. s Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of July, 1997. Specifications and information herein are subject to change without notice. No. 5654-6/6

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