Multimedia ICs 75Ω driver IC with 3 internal circuits BA7622F The BA7622F is a 75Ω driver-IC developed for use in video equipment. It includes three 75Ω driver circuis,two of which have sync-tip clamp inputs.The other driver has a biased input terminated with a 20kΩ resistor.Each output can drive two loads (75Ω × 2). Applications •Video cassette recorders, televisions and camcorders •1)Features Two built-in clamp circuits. 3) Each output can drive two loads. 2) Simultaneous drive of Y, C and composite video signals possible. •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. 1 Multimedia ICs BA7622F •Block diagram GND 1 IN1 2 Clamp IN2 3 Clamp 75Ω driver 8 OUT1 75Ω driver 7 OUT2 75Ω driver 6 OUT3 5 VCC 20k IN3 4 NO Clamp •Pin descriptions 2 Pin No. Pin name 1 GND 2 IN1 Clamp input Input composite video or the Y signal separated from Y / C. 3 IN2 Clamp input Input composite video or the Y signal separated from Y / C. 4 IN3 Biased input Input the chroma signal. Terminated with a 20kΩ resistor. 5 VCC Power supply 6 OUT3 Biased 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 Clamped 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 Clamped output Output for the signal input to IN1. When connected to earth a protection circuit operates, and the IC enters power-save mode. Function Ground connection Multimedia ICs BA7622F •Electrical characteristics (unless otherwise noted, Ta = 25°C and V Parameter CC = 5V, and load is two system drive) Symbol Min. Typ. Max. Unit Conditions VCC 4.5 5.0 5.5 V — Operating voltage Circuit current ICC — 23.6 35.4 mA No signal Maximum output level Vom 2.8 3.3 — VP-P f = 1kHz, THD = 1.0% Voltage gain Gv – 1.2 – 0.6 0 dB f = 1MHz, VIN = 2.0VP-P Gf –3 0 1.3 dB 10MHz / 1MHz, VIN = 1.0VP-P 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 CT — – 60 — dB f = 4.43MHz, VIN = 2.0VP-P ZIN3 17 20 23 kΩ THD32 — 0.1 0.5 % Frequency characteristics Differential gain 75Ω drive 1 Interchannel crosstalk Input impedance (VIN3) Total-harmonic distortion (VIN3) — f = 1kHz, VIN = 1.0VP-P •Input / output circuits OUT1, 2, 3 VCC VCC IN1, 2 20k 2, 3 6, 7, 8 100µA IN3 VCC 20k 4 10k 100µA 3 Multimedia ICs BA7622F •Measurement circuit Vector Scope Analyzer Audio Vector Scope V ~ 1 2 Analyzer Audio Vector Scope Analyzer Audio V ~ 3 1 SWD 2 V ~ 3 1 2 3 VCC = 5V SWF SWE + 0.022µF 47µF 75Ω driver 1 2 75Ω driver Clamp 3 75Ω driver Clamp + 8 75 470µ 75 75 + 470µ 7 + 6 75 75 470µ 75 20k 4 2 + + + 1µ 1µ 1µ 3 VCC = 5V SWB 4 1 200µA + 600 ~ OSC VCC = 5V SWC 1 SG V ~ OSC 1 2 + + + 1µ 1µ 1µ 3 200µA 3 50µA 600 ~ SG V ~ OSC ~ SG Fig.1 4 4 4 + + 1µ 1µ 1µ 2 600 ~ 75 75 75 VCC = 5V SWA + 1000µ 75 5 NO Clamp The circuit for driving one 75Ω output load. The circuit for driving two 75Ω output loads is as. V Multimedia ICs BA7622F •Measurement conditions Parameter Current dissipation Maximum output level Voltage gain Frequency characteristic Interchannel crosstalk Input resistance Total-harmonic distortion IN1 IN2 IN3 OUT1 OUT2 OUT3 SWA SWB SWC SWD SWE SWF ICC 3 3 3 × × × Vom12 1 3 3 3 × × Vom22 3 1 3 × 3 × Symbol Vom32 3 3 1 × × 3 Gv12 1 3 3 3 × × Gv22 3 1 3 × 3 × Gv32 3 3 1 × × 3 f12 1 3 3 3 × × f22 3 1 3 × 3 × f32 3 3 1 × × 3 CT112 1 3 3 × 3 × CT113 1 3 3 × × 3 CT211 3 1 3 3 × × CT213 3 1 3 × × 3 CT311 3 3 1 3 × × CT312 3 3 1 × 3 × ZIN3 3 3 4 × × × THD12 1 3 3 3 × × THD22 3 1 3 × 3 × THD32 3 3 1 × × 3 Conditions — ∗1 ∗2 — — ∗3 ∗4 ×: 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 0.5%. 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). is flowing into the input pin. Measure the input pin open-circuit voltage VIN0. ∗3: Measure the input pin voltage VIN50 when a current of DC50µA -6 The input impedance is given by Z = (VIN50 - VIN0) / 50∗10 [Ω]. ∗4: Input a 1.0VP-P, 1kHz sine wave. Connect a distortion meter to the output and measure the total-harmonic distortion. 5 Multimedia ICs BA7622F •Application example VCC = 5V + 47µF 75Ω driver 1 Composite Video Signal Y Signal + 2 1µF + Clamp 3 Clamp 1µF 8 7 75Ω driver 6 4 0.01µF VIDEO OUT1 75 VIDEO OUT2 + 75 + 5 Fig.2 •Electrical characteristic curves 0 GAIN: GV (dB) GAIN: GV (dB) 0 – 20 – 40 6 – 20 – 40 – 60 – 80 100k 1M 10M 100M 100k 1M Y C 75 75 20 C 1µF 75 NO Clamp Y 1000µF 20k C Signal 75 + 1000µF 75Ω driver 0.022µF 10M FREQUENCY: f (Hz) FREQUENCY: f (Hz) Fig. 3 Frequency characteristic Fig. 4 Crosstalk 100M Multimedia ICs BA7622F •Extermal 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 7