Multimedia ICs 75Ω driver IC with 3 internal circuits BA7623F The BA7623F is a 75Ω driver-IC developed for use in video equipment. Since the input is coming directly with no bias at the base pin, the DC potential for the previous stage can be used for direct DC coupling. Each output can drive two loads (75Ω × 2). Applications •Video cassette recorders, televisions and camcorders •1)Features Can be directly coupled to the previous circuit. 2) Each output can drive two loads. •Absolute maximum ratings (Ta = 25°C) Parameter Power supply voltage Symbol Limits Unit VCC 8.0 V mW Pd 550∗ Operating temperature Topr – 25 ~ + 75 °C Storage temperature Tstg – 55 ~ + 125 °C Power dissipation ∗ Reduced by 5.5mW for each increase in Ta of 1°C over 25°C. •Block diagram GND 1 75Ω driver 8 OUT1 IN1 2 75Ω driver 7 OUT2 IN2 3 75Ω driver 6 OUT3 IN3 4 5 VCC 1 Multimedia ICs BA7623F •Pin descriptions Pin No. Pin name Function 1 GND 2 IN1 Direct-coupling input Input composite video or component video (RGB) signals. Keep the input signal level in the range 0.5V to 3.8V. 3 IN2 Direct-coupling input Input composite video or component video (RGB) signals. Keep the input signal level in the range 0.5V to 3.8V. 4 IN3 Direct-coupling input Input composite video or component video (RGB) signals. Keep the input signal level in the range 0.5V to 3.8V. 5 VCC Power supply 6 OUT3 Direct-coupling output Output for the signal input to IN3. When connected to earth a protection circuit operates, and the IC enters power-save mode. 7 OUT2 Direct-coupling output Output for the signal input to IN2. When connected to earth a protection circuit operates, and the IC enters power-save mode. 8 OUT1 Direct-coupling output Output for the signal input to IN1. When connected to earth a protection circuit operates, and the IC enters power-save mode. Ground connection •Electrical characteristics (unless otherwise noted, Ta = 25°C and V Max. = 5V, and load is two system drive) Symbol Min. Operating voltage VCC 4.5 5.0 5.5 V Supply current ICC — 25.2 37.8 mA Maximum output level Vom 2.9 3.4 — VP-P f = 1kHz, THD = 1.0% Voltage gain GV – 1.0 – 0.5 0 dB f = 1MHz, VIN = 2.0VP-P Cf –3 10MHz / 1MHz, VIN = 1.0VP-P Parameter Typ. CC Unit Conditions — No signal 0 1 dB Differential gain 75Ω drive 1 DG1 — 0.4 1.0 % VIN = 2.0VP-P, standard staircase signal Differential phase 75Ω drive 1 DP1 — 0.4 1.0 deg VIN = 2.0VP-P, standard staircase signal Differential gain 75Ω drive 2 DG2 — 0.7 2.0 % VIN = 2.0VP-P, standard staircase signal Differential phase 75Ω drive 2 DP2 — 0.7 2.0 deg VIN = 2.0VP-P, standard staircase signal Interchannel crosstalk CT — – 60 — dB f = 4.43MHz, VIN = 2.0VP-P Total harmonic distortion THD — 0.1 0.5 % f = 1kHz, VIN = 1.0VP-P Frequency characteristic 2 Multimedia ICs BA7623F •Input / output circuits IN1, 2, 3 OUT1, 2, 3 VCC VCC 20k 2, 3, 4 pin 6, 7, 8 pin •Measurement circuit Vector Scope Vector Scope Analyzer Audio V ~ 1 2 Vector Scope Analyzer Audio Analyzer Audio V ~ V ~ 3 1 SWD 2 3 1 2 3 VCC = 5V SWF SWE 0.022µF + 47µF 75Ω driver 1 470µ 1 75Ω driver 7 + 470µ 3 75Ω driver 6 + 1µ 2.1V ~ 1k + 1µ 2.1V ~ 600 1 1k 1µ 2.1V ~ SG 2 470µ SWC 3 1k + + 1µ 2.1V 75 75 75 5 SWB 3 1k + + OSC 2 75 75 2 4 SWA 75 + 8 1k + 1µ 2.1V 1µ 2.1V 2 3 1k + + ~ 600 1 1k 1µ 1µ 2.1V 2.1V ~ 1k 1µ 2.1V ~ SG SG 600 OSC 1k + OSC The circuit for driving one 75Ω output load. The circuit for driving two 75Ω output loads is as + 75 1000µ 75 75 75 Fig. 1 3 Multimedia ICs BA7623F •Measurement conditions Parameter Current dissipation Maximum output level Voltage gain Frequency characteristic Interchannel crosstalk Total-harmonic distortion Differential gain (DG) Differential phase (DP) IN1 IN2 IN3 OUT1 OUT2 OUT3 SWA SWB SWC SWD SWE SWF Icc 3 3 3 × × × × × × Symbol Vom12 1 3 3 Vom22 3 1 3 Vom32 3 3 1 3 × × Gv12 1 3 3 Gv22 3 1 3 Gv32 3 3 1 × × f12 1 3 3 3 f22 3 1 3 f32 3 3 1 CT112 1 3 3 CT113 1 3 3 3 × × × × CT211 3 1 3 3 CT213 3 1 3 × CT311 3 3 1 3 CT312 3 3 1 × THD12 1 3 3 3 THD22 3 1 3 THD32 3 3 1 × × DG1 2 3 3 DG2 3 2 3 DG3 3 3 2 × × 1 DP1 2 3 3 1 DP2 3 2 3 DP3 3 3 2 × × 3 × × 3 × × 3 × 3 × × × × 3 × 3 × × 1 × × 1 × Conditions — ∗1 3 × × ∗2 3 × × — 3 × 3 × — 3 × × × × ∗3 3 × × — 1 × × — 1 ×: Any of switches 1, 2, or 3 possible. ∗ 1: Connect a distortion meter to the output, and input a f = 1kHz sine wave. Adjust the input level until the output distortion is 1.0%. This output voltage at this time is the maximum output level Vom (VP-P). ∗ 2: Input a 2.0VP-P, 1MHz sine wave. The voltage gain is given by GV = 20 log (VOUT / VIN)(dB). ∗ 3: Input a 1.0VP-P, 1kHz sine wave. Connect a distortion meter to the output and measure the total-harmonic distortion. 4 Multimedia ICs BA7623F •Application example VCC = 5V 47µF + 0.022µF VIDEO OUT1 Q1 1000µ + 75 VIDEO OUT2 R1 1 75Ω driver 75 8 GND VIDEO OUT3 2 75Ω driver 7 75Ω driver 6 1000µ + 75 VIDEO OUT4 Q1 75 3 R1 VIDEO OUT5 1000µ + 4 75 VIDEO OUT6 5 75 Q1 R1 Fig. 2 5 Multimedia ICs BA7623F •Electrical characteristic curves 0 GAIN: GV (dB) GAIN: GV (dB) 20 0 – 20 – 40 – 20 – 40 – 60 – 80 100k 1M 10M 100M 100k 1M 10M FREQUENCY: f (Hz) FREQUENCY: f (Hz) Fig. 3 Frequency characteristic Fig. 4 Crosstalk 100M notes •(1)Operation The input signals are signals such as composite video signals, or component video (RGB) signals. (2) When using direct coupling, keep the input signals in the range: 0.5V to 3.8V. •External dimensions (Units: mm) 1 4 0.11 1.27 0.15 ± 0.1 4.4 ± 0.2 5 1.5 ± 0.1 6.2 ± 0.3 5.0 ± 0.2 8 0.4 ± 0.1 0.3Min. 0.15 SOP8 6