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| Multimedia ICs Video signal switcher BA7645N The BA7645N is a four-channel analog multiplexer with mute, designed for use in video cassette recorders. It features a large dynamic range, and wide operating frequency range, and has sync-tip inputs which are ideal for switching video signals. *Applications recorders and televisions Video cassette *Features/ 1-output switches. 1) 4-input 2) Built-in mute. 3) Sync-tip inputs. 4) Wide operating supply voltage range (4.5V to 13.0V). 5) Low power consumption (48mW Typ.). 6) Excellent frequency characteristics (10MHz, 0dB Typ.). 7) Wide dynamic range (3.5VP-P Typ.). 8) Low interchannel crosstalk ( - 65dB Typ., f = 4.43MHz). *Absolute maximum ratings (Ta = 25C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limit 13.5 850 - 25 ~ + 75 - 55 ~ + 125 Unit V mW C C Reduced by 8.5mW for each increase in Ta of 1C over 25C. *Block diagram MUTE *Truth table CTLA L (OPEN) L (OPEN) H LOGIC CTLB L (OPEN) H L (OPEN) H CTLC L (OPEN) L (OPEN) L (OPEN) L (OPEN) H OUT IN1 IN2 IN3 IN4 MUTE H 1 2 3 4 5 6 7 8 9 10 Either "L (open)" or "H". CTLC CTLA CTLB IN2 IN3 IN4 IN1 GND VCC VOUT 1 Multimedia ICs BA7645N *Equivalent circuits CLAMP INPUT Input bias current 1A [Typ.] Input clamp voltage 2.1V [VCC = 5V,Typ.] Reference value IN D1 D2 Vcc OUTPUT Vcc Q1 R2 100 Q2 Q1 D1 OUT Output impedance 20 [Typ.] Output DC voltage 0.55V [VCC = 5V, Typ.] 0.8A 100A 2mA D2 CTLA / CTLB Vcc R4 20k CTLC Vcc R4 30k R1 CTLA / B 100 R2 Q3 50k R3 34k D2 CTLC R1 100 R2 Q3 45k R3 29k D2 *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 switching level A CTL pin switching level B CTL pin switching level C Symbol VCC ICC Vom GV CT Cf VTH-A VTH-B VTH-C Min. 4.5 -- 3.0 - 0.5 -- - 3.0 1.0 1.0 1.0 Typ. -- 9.5 3.5 0 - 65 0 2.0 2.0 2.0 Max. 13.0 14.5 -- + 0.5 -- + 1.0 3.0 3.0 3.0 Unit V mA VP-P dB dB dB V V V Conditions -- -- f = 1kHz, THD = 0.5% f = 1MHz, VIN = 1.0VP-P f = 4.43MHz, VIN = 1.0VP-P f = 10MHz / 1MHz, VIN = 1.0VP-P -- -- -- Not designed for radiation resistance. 2 Multimedia ICs BA7645N *Measurement circuit MUTE LOGIC V 1 2 3 4 5 6 7 8 9 10 VCC P-P + SW1 1 2 1F OSC 50 1F SW5 1 2 31 SW6 23 OSC 50 1F SW7 1 23 A 47F 0.022F SW2 1 2 1F OSC 1 SW3 2 1F OSC 50 1F 1 SW4 2 1F 50 1F VCC VCC VCC Fig. 1 *Electrical characteristic curves 10 9 20 4 OUTPUT VOLTAGE: VOUT (VP-P) VOLTAGE GAIN: Cf (dB) 8 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 VCC = 12V 0 2 CROSSTALK: CT (dB) 300k 1M 3M 10M 30M 100M VCC = 9V - 20 0 VCC = 5V - 40 -2 - 60 -4 8 9 10 100k - 80 100k 300k 1M 3M 10M 30M 100M INPUT VOLTAGE: VIN (VP-P) FREQUENCY: f (Hz) FREQUENCY: f (Hz) Fig. 2 VIN vs. VOUT (f = 1kHz) Fig. 3 Frequency characteristics Fig. 4 Interchannel crosstalk 3 Multimedia ICs BA7645N *Measurement conditions Parameter Current dissipation Maximum output level IN 1 IN 2 IN 3 IN 4 IN 1 IN 2 IN 3 IN 4 IN1IN2 IN1IN3 IN1IN4 IN1MUTE IN2IN3 IN2IN4 IN2MUTE IN3IN4 IN3MUTE IN4MUTE IN 1 IN 2 IN 3 IN 4 CTLA CTLB CTLC Symbol ICC Vom Vom Vom Vom GV GV GV GV CT CT CT CT CT CT CT CT CT CT Gf Gf Gf Gf VTH VTH VTH Switch settings SW1 2 1 2 2 2 1 2 2 2 1 1 1 1 2 2 2 2 2 2 1 2 2 2 2 2 1 SW2 2 2 1 2 2 2 1 2 2 2 2 2 2 1 1 1 2 2 2 2 1 2 2 2 1 2 SW3 2 2 2 1 2 2 2 1 2 2 2 2 2 2 2 2 1 1 2 2 2 1 2 1 2 2 SW4 2 2 2 2 1 2 2 2 1 2 2 2 2 2 2 2 2 2 1 2 2 2 1 2 2 2 SW5 2 3 3 2 2 3 3 2 2 3 2 2 SW6 2 3 2 3 2 3 2 3 2 2 3 2 3 2 2 SW7 2 3 3 3 3 3 3 3 3 3 3 3 2 3 3 2 3 2 2 3 3 3 3 3 3 1 Measurement method Ammeter f = 1kHz, THD = 0.5% Note 1 f = 1MHz, VIN = 1VP-P Note 2 Voltage gain Interchannel crosstalk 3 3 2 2 1 3 3 2 2 2 3 2 3 2 3 1 3 f = 4.43MHz, VIN = 1VP-P Note 3 Frequency characteristic CTL pin switching level f = 10MHz / 1MHz VIN = 1VP-P Note 4 Note 5 Note 6 Anywhere is possible. Note 1: Connect a distortion meter to the output, and input a f = 1kHz sine wave. Adjust the input 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 f = 1MHz, VIN = 1VP-P sine wave. The voltage gain is given by GV = 20 log (VOUT / VIN). Note 3: Input a f = 4.43MHz, VIN = 1VP-P sine wave. The interchannel crosstalk is given by CT = 20 log (VOUT / VIN). Note 4: Input f = 1MHz and 10MHz, VIN = 1VP-P sine waves. The frequency characteristic is given by Gf = 20 log (VOUT (f = 10MHz) / VOUT (f = 1MHz)). Note 5: Input a f = 1MHz, VIN = 1VP-P 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. Note 6: Input a f = 1MHz, VIN = 1VP-P sine wave. Increase the CTL pin voltage from 0V. The CTL pin switching level (VTH) is the CTL pin voltage at which the VOUT level goes below 1.0VDC *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 4 |
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