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Part: BA7623F
Category:
Multimedia
Description:
Company: ROHM Electronics
Datasheet: Download BA7623F datasheet File size : 97 kB
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Datasheet text preview:
Multimedia ICs
75 driver IC with 3 internal circuits
BA7623F
The BA7623F is a 75 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 (75 × 2). pp cations ·iAeolicassette recorders, televisions and camcorders Vd re ·)FCeaantubesdirectly coupled to the previous circuit. 1 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 75 driver 8 OUT1
IN1
2
75 driver
7
OUT2
IN2
3
75 driver
6
OUT3
IN3
4
5
V CC
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 VCC = 5V, and load is two system drive)
Parameter Operating voltage Supply current Maximum output level Voltage gain Frequency characteristic Differential gain 75 drive 1 Differential phase 75 drive 1 Differential gain 75 drive 2 Differential phase 75 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 % 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 Conditions --
2
Multimedia ICs
BA7623F
·Input / output circuits
IN1, 2, 3
VC C 20k
OUT1, 2, 3
VC C
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 75 driver 8 + 75 75
0.022µF
4 7 0µ + 4 7 0µ + 75
2
75 driver
7
75
3
75 driver
6
75 4 7 0µ 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 75 output load. The circuit for driving two 75 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 7 5 driver 1000µ + 75 75 driver 8 75 75
VIDEO OUT1
VIDEO OUT2
VIDEO OUT3 2 7
VIDEO OUT4 75
Q1 3 R1 75 driver 6 1000µ + 4 5
VIDEO OUT5 75 VIDEO OUT6 75
Q1
R1
Fig. 2
5
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