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