BA7644AN

Multimedia ICs Video signal switcher BA7644AN The BA7644AN is a four-channel analog multiplexer with mute, designed for use in video cassette recorders. It features a wide dynamic range, and wide operating frequency range, and is suitable for switching audio and video signals. •Applicationsaudio signal switching VCR, TV and •Features/ 1-output switches. 1) 4-input 2) Built-in mute. 3) Wide operating supply voltage range (4.5V to 13.0V). 4) Low power consumption (48mW Typ.). 5) Excellent frequency characteristics (10MHz, 0dB Typ.). 6) Wide dynamic range (3.5VP-P Typ.). 7) High input impedance (20kΩ Typ.). 8) Low interchannel crosstalk ( – 65dB Typ., f = 4.43MHz). •Absolute maximum ratings (Ta = 25°C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 13.5 850∗ – 25 ~ + 75 – 55 ~ + 125 Unit V mW °C °C ∗ Reduced by 8.5mW for each increase in Ta of 1°C over 25°C. •Block diagram MUTE •Truth table CTL - A L (OPEN) L (OPEN) H H LOGIC CTL - B L (OPEN) H L (OPEN) H CTL - C L (OPEN) L (OPEN) L (OPEN) L (OPEN) H OUT IN1 IN2 IN3 IN4 MUTE ∗ ∗ Either "L (open)" or "H". 5 CTLC 6 IN3 7 VCC 8 IN4 9 GND 10 VOUT ∗ 1 IN1 2 CTLA 3 CTLB 4 IN2 1 Multimedia ICs BA7644AN •Equivalent circuits CLAMP INPUT IN Input bias current 1µA (Typ.)∗ Input bias voltage 3.68V (VCC = 5V, Typ.)∗ ∗ Reference value D1 OUTPUT Vcc D2 Vcc Q1 D1 OUT 100 R1 Q2 20k 2mA D2 100µA Q1 R2 Output impedance 20Ω [Typ.]∗ Output DC voltage 2.2V (VCC = 5V, Typ.)∗ 100µA 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 2 Multimedia ICs BA7644AN CC •Electrical characteristics (unless otherwise noted, Ta = 25°C and V Parameter Operating voltage Supply current Maximum output level Voltage gain Interchannel crosstalk IN - IN IN - MUTE Symbol VCC ICC Vom GV CTin CTM Cf THD ZIN VTH-A VTH-B VTH-C Min. 4.5 — 3.0 – 0.5 — — – 3.0 — 14 1.0 1.0 1.0 Typ. — 9.5 3.5 0 – 65 – 55 0 0.007 20 2.0 2.0 2.0 Max. 13.0 14.5 — 0.5 — — 1.0 — 26 3.0 3.0 3.0 = 5V) Conditions — — f = 1kHz, THD = 0.5% f = 1MHz, VIN = 1.0VP-P f = 4.43MHz, VIN = 1.0VP-P f = 4.43MHz, VIN = 1.0VP-P f = 10MHz / 1MHz, VIN = 1.0VP-P f = 1kHz, VIN = 1.0VP-P — — — — Unit V mA VP-P dB dB dB dB % kΩ V V V Frequency characteristic Total-harmonic distortion Input impedance CTL pin switching level A CTL pin switching level B CTL pin switching level C Not designed for radiation resistance. •Measurement circuit MUTE VCC P-P + LOGIC 1 2 3 4 5 6 7 8 9 10 SW1 1 23 SW2 1 23 SW3 1 23 SW4 1 23 1µF V 1µF V 1µF 1µF OSC 50Ω 50µA 1µF V 1µF OSC 50µA 50Ω 1µF OSC 50µA 1µF V 50µA OSC 50Ω ~ ~ SW6 SW5 1 23 1 23 ~ SW7 1 23 ~ VCC VCC VCC Fig. 1 50Ω 0.022µF 47µF V A 3 Multimedia ICs BA7644AN •Measurement conditions Parameter Current dissipation Maximum output level IN 1 IN 2 IN 3 IN 4 IN1 IN2 IN3 IN4 IN1→IN2 IN1→IN3 IN1→IN4 IN1→MUTE IN2→IN3 IN2→IN4 IN2→MUTE IN3→IN4 IN3→MUTE IN4→MUTE IN 1 IN 2 IN 3 IN 4 IN 1 IN 2 IN 3 IN 4 IN 1 IN 2 IN 3 IN 4 CTL - A CTL - B CTL - C Symbol ICC Vom Vom Vom Vom GV GV GV GV CT CT CT CT CT CT CT CT CT CT Gf Gf Gf Gf THD THD THD THD ZIN ZIN ZIN ZIN 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 1 2 2 2 3 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 2 2 3 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 2 2 1 2 2 2 3 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 1 2 2 2 3 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 3 3 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 3 3 2 2 3 3 2 2 1 3 3 2 2 2 ∗ ∗ ∗ ∗ 3 2 3 2 3 2 3 2 3 2 3 2 3 1 3 f = 4.43MHz, VIN = 1VP-P Note 3 Frequency characteristic f = 10MHz / f = 1MHz VIN = 1VP-P Note 4 f = 1kHz VIN = 1VP-P Note 5 Total-harmonic distortion Input impedance Note 6 CTL pin switching level Note 7 Note 8 ∗ 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 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 and measure the total-harmonic distortion of the output using a total-harmonic distortion meter. Note 6: Measure the input pin voltage VIN50 when a current of DC50µA is flowing into the input pin. Measure the input pin open-circuit voltage. The input impedance is given by Z = (VIN50 - VIN0) / 50 × 10-6 [Ω]. Note 7: 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. Note 8: Input a 1VP-P, 1MHz 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 above 1.0VP-P. 4 Multimedia ICs BA7644AN •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 VCC = 9V 2 CROSSTALK: CT (dB) 300k 1M 3M 10M 30M 100M 0 – 20 0 VCC = 5V – 40 –2 – 60 8 9 10 –4 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 •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