Multimedia ICs Video signal switcher BA7605N The BA7605N is a switching IC developed for use in VCRs. It has two two-channel analog multiplexers with a large dynamic range, and wide operating frequency range. The switch has sync-tip clamped inputs and is ideal for switching video signals. Applications •Video cassette recorders and televisions •1)Features Two 2-input / 1-output switches. 5) Excellent frequency characteristics (10MHz, 0dB Typ.). 6) Wide dynamic range (2.9VP-P Typ.). 7) Fast switching speed (50ns Typ.). 2) Sync-tip clamped inputs. 3) 5V power supply. 4) Low power consumption (42mW Typ.). •Block diagram 5 6 7 8 9 OUTb CTLb IN2b GND CTL Output L IN 2 H IN 1 10 IN1b 4 CTLa VCC 3 Sb OUTa 2 IN2a 1 IN1a Sa Sa, Sb: clamp inputs •Absolute maximum ratings (Ta = 25°C) Parameter Power supply voltage Symbol Limits Unit VCC 9 V mW Pd 500∗ Operating temperature Topr – 40 ~ + 85 °C Storage temperature Tstg – 55 ~ + 125 °C Power dissipation ∗ Reduced by 5.0mW for each increase in Ta of 1°C over 25°C. 1 Multimedia ICs BA7605N •Equivalent circuits Sa,Sb IN VCC I2 0.3mA R3 22k Q5 R12 200 R16 200 R7 100 Q9 R2 4k Q6 R9 200 Q7 Q8 R15 200 Q10 Q11 Q3 R10 100 R11 100 R13 100 R14 100 Q2 Q12 Q1 OUT I1 0.6mA R8 25k R1 1k I4 0.6mA R17 12k I5 1mA CTL VCC R1 50k R6 25k R2 200 CTL I1 0.25mA 2 I2 0.6mA Q1 Q6 R3 400 Q3 Q5 Q2 Q4 R5 25k R4 400 I3 0.06mA Multimedia ICs BA7605N •Electrical characteristics (unless otherwise noted, Ta = 25°C and V Parameter Operating voltage CC = 5V) Symbol Min. Typ. Max. Unit Conditions VCC 4.5 5.0 5.5 V — Supply current ICC — 8.4 10.0 mA — Maximum output level Vom 2.6 2.9 — VP-P f = 1kHz, THD = 0.5% Voltage gain GV – 0.5 0 0.5 dB f = 1MHz, VIN = 1VP-P Interchannel crosstalk CT — – 65 — dB f = 4.43MHz, VIN = 1VP-P Frequency characteristics Gf –3 0 1 dB 10MHz / 1MHz, VIN = 1VP-P CTL pin switch level VTH 2.5 3.0 V 2.0 — Note: Refer to the measurement circuit given in Fig. 1. data •PinReference DC voltages (reference values) Units: Vdc Pin No. DC voltage Pin No. DC voltage 1 2.05 6 0.65 2 5.00 7 4.91 3 2.05 8 2.05 4 4.91 9 0 5 0.65 10 2.05 Electrical characteristics Parameter Min. Typ. Max. Unit 0.49 0.65 0.80 Vdc Input impedance (with clamp) — 1.7M — Ω Output impedance — 30 — Ω Sync tip clamp level The input coupling capacitor values should be 0.1µF to 1µF. 3 Multimedia ICs BA7605N •Measurment circuit 1 3 4 5 6 V V 7 8 9 10 VIN1a OSC ~ VIN2a OSC R ~ 1 2 3 1 VCC 2 VCC 3 1 2 3 VIN2b OSC ~ R 1 2 VIN1b OSC R ~ R = 75Ω Fig.1 4 3 105 3 S1b 105 1 S2b S3b 105 2 105 3 S3a 105 2 105 1 S2a 105 S1a 105 223 A1 47µ VCC 2 R Multimedia ICs BA7605N •Measurement conditions Parameter Symbol Voltage gain Interchannel crosstalk Frequency characteristic CTL pin switching level S2a S3a S1b S2b S3b Measurement method Ammeter ICC 2 2 2 2 2 2 IN1a IN2a IN1b IN2b IN1a IN2a IN1b IN2b IN1a IN2a IN1b IN2b IN1a IN2a IN1b IN2b Vom Vom Vom Vom GV GV GV Gv CT CT CT CT Gf Gf Gf Gf 3 2 2 2 3 2 2 2 2 3 2 2 3 2 2 2 2 3 2 2 2 3 2 2 3 2 2 2 2 3 2 2 2 3 2 2 2 3 2 2 2 3 2 2 2 3 2 2 2 2 3 2 2 2 3 2 2 2 2 3 2 2 3 2 2 2 2 3 2 2 2 3 2 2 3 2 2 2 2 3 2 2 2 3 2 2 2 3 2 2 2 3 2 2 2 3 CTLa CTLb VTH VTH 3 2 2 2 1 2 2 3 2 2 2 1 Current dissipation Maximum output level Switch settings S1a Note 1 Note 2 Note 3 Note 4 Note 5 Note 1: Connect a distortion meter to the output, and input a f = 1kHz sine wave. Adjust the output level until the output distortion is 0.5%. This output voltage at this time is the maximum output level Vom (VP-P). Note 2: Input a 1VP-P, 1MHz sine wave. The voltage gain is given by GV = 20 log (VOUT / VIN). Note 3: Input a 1VP-P, 4.43MHz sine wave. The interchannel crosstalk is given by CT = 20 log (VOUT / VIN). Note 4: Input 1VP-P, 1MHz and 10MHz sine waves. The frequency characteristic is given by Gf = 20 log (VOUT (f = 10MHz) / VOUT (f = 1MHz)). Note 5: Input a 1VP-P, 1MHz sine wave. Reduce the CTL pin voltage from VCC. The CTL pin switching level (VTH) is the CTL pin voltage at which the VOUT level drops below 20mVP-P. •External dimensions (Units: mm) 2.8 ± 0.2 1.2 5.8 ± 0.2 1 3.5 ± 0.5 10.5 ± 0.5 25.2 ± 0.2 10 0.6 2.54 0.8 0.3 ± 0.1 1.3 SIP10 5