BA7623

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