Ordering number : EN5654 Monolithic Linear IC LA7357 PAL/SECAM Discrimination Circuit for VHS VCRs Overview Package Dimension 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. unit: mm 3098B-DIP10S [LA7357] Specifications SANYO: DIP10S Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Symbol Conditions VCC max Allowable power dissipation Pd max Ta ≤ 65 °C Ratings Unit 7.0 V 120 mW Operating temperature Topr –10 to +65 °C Storage temperature Tstg –40 to +125 °C Ratings Unit Operating Conditions at Ta = 25°C Parameter Supply voltage Symbol VCC Operating voltage range VCC op Conditions 5.0 V 4.8 to 5.5 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 = 25°C, VCC = 5 V Parameter Symbol Ratings Conditions min typ Unit max ICC1 Pin 5 = ground, pin 7 influx current: T4 output 7.0 10.0 13.0 mA ICC2 Pin 5 = VCC, pin 7 influx current: T4 output 7.5 10.5 13.5 mA BTH 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 2.2 2.5 2.8 V SYNC threshold level STH 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 0.6 0.8 1.0 V Input limiter amplifier gain LIMG Stipulated as the output ratio when a 10 mVp-p amplitude sine wave is input to pin 1: T2 output 9 12 15 dB Input limiter amplifier level LIMD Measure the output amplitude when a 300 mVp-p amplitude sine wave is input to pin 1: T2 output 150 190 230 mVp-p Comparator hysteresis high-level voltage Comp H The V1 level when T1 switches from low to high when slowly raising V1 from 0 V: T1 output 2.7 3.0 3.3 V Comparator hysteresis low-level voltage Comp L The V1 level when T1 switches from high to low when slowly lowering V1 from 5 V: T1 output 2.0 2.3 2.6 V Current drain BGP threshold level DET-OUT output high-level voltage DETH With a 2-kΩ load: T1 output 3.6 4.0 4.4 V DET-OUT output low-level voltage DETL With a 2-kΩ load: T1 output 0 0.2 0.4 V Switching Conditions Input signal Symbol Input pulse Applied voltage S1 S2 S3 S4 ICC1 No signal No signal 0V ICC2 No signal No signal BTH Sig.1 STH V1 V2 Switch states SW1 SW2 SW3 SW4 SW5 0V Off Off Off Off Off 5V 5V Off Off Off Off Off No signal1 0V 0V Variable DC level On Off On Off Off No signal Sig.1 0V 0V Variable DC level On Off On Off Off LIMG Sig.1 No signal 5V 0V On Off Off Off Off LIMD Sig.1 No signal 5V 0V On Off Off Off On Comp H No signal No signal No signal No signal Variable DC level Off On Off Off On Comp L Variable DC level No signal No signal No signal No signal Off On Off Off On DETH Sig.2 Sig.1 P2 P1 Off Off Off Off On DETL Sig.3 Sig.1 P2 P1 Off Off Off Off On No. 5654-2/6 LA7357 Block Diagram Test Circuit No. 5654-3/6 LA7357 Pin Functions Pin No. Pin 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 4 GND 5 Pin Functions Equivalent circuit • 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. • 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 7 VCC • 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. Continued on next page. No. 5654-4/6 LA7357 Continued from preceding page. Pin No. Pin Pin Functions 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. Equivalent circuit No. 5654-5/6 LA7357 Test Input Signals and Pulses fsc sine wave SECAM color bar signal PAL color bar signal ■ 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. ■ Anyone purchasing any products described or contained herein for an above-mentioned use shall: ➀ 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: ➁ 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. ■ 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