VIF / SIF signal processor BA7357S The BA7357S is a multi-format (M, B / G, D / K, and I) VIF / SIF signal processor for television and VCR applications. It features a built-in sound-trap and band-pass filters, and employs a pulse-count audio detector that does not require adjustment. This IC reduces external component requirements, and allows space savings.
•Applications TVs and VCRs •Features 1) Separate-carrier PLL with full synchronous detec2) 3)
tion. Excellent DG / DP, CS beat (920kHz) and cross color. In addition, by pulling down the SIF input (pin 9) it can be used as an intercarrier. The IF AGC time constant is dualayered to allow faster speeds. The variable-gain amplifier has excellent linearity to ensure low distortion, and AGC variance and temperature drift have been minimized. Significant improvement in image quality through use of a filter that reduces CS beat. Built-in SOUND filter (4.5MHz SOUND Trap and 4.5MHz SOUND BPF).
The MODE switch can be used to switch the SOUND filter frequency band to match the transmission format (M: 4.5, B / G: 5.5, I: 6.0, D / K: 6.5MHz). 6) The audio detector uses a pulse-counter detector that does not require adjustment, eliminating the need for a detector coil. Broad S-curve for multiplex broadcast compatibility. 7) Use of pulse-counter detection and the built-in SOUND filter means fewer pins, external components and adjustment locations are required. The IC is available in a 22-pin SDIP package and will enable cost and space savings.
•Absolute maximum ratings (Ta = 25°C) Parameter
– 15 ~ + 70
– 40 ~ + 150
Pin 2 applied voltage
∗1 24Ω resistor connected between VCC and Vreg. ∗2 Reduced by 10mW for each increase in Ta 1°C over 25°C.
•Recommended operating conditions (Ta = 25°C) Parameter
Power supply voltage (9V) Power supply voltage (12V)
8.8 ~ 9.2∗1
11.7 ~ 12.3∗2
8.5 ~ 9.5∗1
Guaranteed operating power supply voltage
∗1 24Ω resistor connected between VCC and Vreg. ∗2 56Ω resistor connected between VCC and Vreg. 1