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 •Video cassette recorders and televisions •1)Features 4-input / 1-output switches. 6) Excellent frequency characteristics (10MHz, 0dB Typ.). 7) Wide dynamic range (3.5VP-P Typ.). 8) Low interchannel crosstalk ( – 65dB Typ., f = 4.43MHz). 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.). •Absolute maximum ratings (Ta = 25°C) Parameter Symbol Limit Unit VCC 13.5 V Pd 850∗ mW Operating temperature Topr – 25 ~ + 75 °C Storage temperature Tstg – 55 ~ + 125 °C Power supply voltage Power dissipation ∗ Reduced by 8.5mW for each increase in Ta of 1°C over 25°C. •Block diagram •Truth table MUTE LOGIC CTLC OUT CTLA CTLB L (OPEN) L (OPEN) L (OPEN) IN1 L (OPEN) H L (OPEN) IN2 H L (OPEN) L (OPEN) IN3 H H L (OPEN) IN4 ∗ ∗ H MUTE 6 7 8 9 10 IN4 GND VOUT CTLB 5 IN3 CTLA 4 VCC 3 IN2 2 CTLC 1 IN1 ∗ Either "L (open)" or "H". 1 Multimedia ICs BA7645N IN •Equivalent circuits CLAMP INPUT ∗ Reference value Input bias current 1µA [Typ.]∗ Input clamp voltage 2.1V [VCC = 5V,Typ.]∗ D1 OUTPUT D2 Vcc Vcc Q1 R2 Q1 100 D1 Q2 0.8µA OUT Output impedance 20Ω [Typ.]∗ Output DC voltage 0.55V [VCC = 5V, Typ.]∗ 100µA 2mA D2 CTLA / CTLB CTLC Vcc Vcc R4 R1 R2 100 50k CTLA / B R4 20k R3 Q3 R3 CC = 5V) Symbol Min. Typ. Max. Unit Conditions VCC 4.5 — 13.0 V — Supply current ICC — 9.5 14.5 mA Maximum output level Vom 3.0 3.5 — VP-P f = 1kHz, THD = 0.5% Voltage gain GV – 0.5 + 0.5 dB f = 1MHz, VIN = 1.0VP-P Interchannel crosstalk CT — — dB f = 4.43MHz, VIN = 1.0VP-P Frequency characteristics Cf – 3.0 + 1.0 dB f = 10MHz / 1MHz, VIN = 1.0VP-P 0 – 65 0 — CTL pin switching level A VTH-A 1.0 2.0 3.0 V — CTL pin switching level B VTH-B 1.0 2.0 3.0 V — CTL pin switching level C VTH-C 1.0 2.0 3.0 V — 䊊Not designed for radiation resistance. 2 29k D2 •Electrical characteristics (unless otherwise noted Ta = 25°C and V Operating voltage R2 45k 34k D2 Parameter R1 100 CTLC Q3 30k Multimedia ICs BA7645N •Measurement circuit MUTE LOGIC V 1 2 3 4 5 6 7 8 9 P-P 10 VCC A + SW1 SW2 2 1 1 1µF SW3 2 1 1µF OSC 50Ω SW5 SW6 2 31 2 3 1 VCC VCC 1 1µF 1µF SW7 1µF 1 2 OSC OSC 50Ω SW4 47µF 0.022µF 2 1µF OSC 50Ω 50Ω 1µF 1µF 2 3 VCC Fig. 1 •Electrical characteristic curves 20 10 4 VCC = 12V 7 VCC = 9V 6 5 4 VCC = 5V 3 0 CROSSTALK: CT (dB) 8 VOLTAGE GAIN: Cf (dB) OUTPUT VOLTAGE: VOUT (VP-P) 9 2 0 –2 2 – 40 – 60 1 0 0 – 20 –4 1 2 3 4 5 6 7 8 9 10 100k 300k 1M 3M 10M 30M 100M – 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 Symbol Switch settings SW1 SW2 SW3 SW4 SW5 SW6 SW7 Measurement method Ammeter ICC 2 2 2 2 2 2 2 Maximum output level IN 1 IN 2 IN 3 IN 4 Vom Vom Vom Vom 1 2 2 2 2 1 2 2 2 2 1 2 2 2 2 1 3 3 2 2 3 2 3 2 3 3 3 3 f = 1kHz, THD = 0.5% Note 1 Voltage gain IN 1 IN 2 IN 3 IN 4 GV GV GV GV 1 2 2 2 2 1 2 2 2 2 1 2 2 2 2 1 3 3 2 2 3 2 3 2 3 3 3 3 f = 1MHz, VIN = 1VP-P Note 2 CT CT CT CT CT CT CT CT CT CT 1 1 1 1 2 2 2 2 2 2 2 2 2 2 1 1 1 2 2 2 2 2 2 2 2 2 2 1 1 2 2 2 2 2 2 2 2 2 2 1 3 2 2 2 3 2 Interchannel crosstalk IN1→IN2 IN1→IN3 IN1→IN4 IN1→MUTE IN2→IN3 IN2→IN4 IN2→MUTE IN3→IN4 IN3→MUTE IN4→MUTE f = 4.43MHz, VIN = 1VP-P Note 3 Frequency characteristic IN 1 IN 2 IN 3 IN 4 Gf Gf Gf Gf 1 2 2 2 2 1 2 2 2 2 1 2 f = 10MHz / 1MHz VIN = 1VP-P Note 4 CTL pin switching level CTLA CTLB CTLC VTH VTH VTH 2 2 1 2 1 2 1 2 2 Current dissipation ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ 3 3 3 2 3 3 2 3 2 2 2 2 2 1 3 3 2 2 3 2 3 2 3 3 3 3 2 2 2 1 3 3 3 1 3 3 3 1 2 2 2 3 2 2 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) 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 1.3 SIP10 4 0.3 ± 0.1