UNISONIC TECHNOLOGIES CO., LTD
A7623
LINEAR INTEGRATED CIRCUIT
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Copyright © 2005 Unisonic Technologies Co., Ltd
QW-R121-014,A
2×75Ω DRIVER IC WITH 3
INTERNAL CIRCUITS
DESCRIPTION
The UTC A7623 is a 75Ω driver-IC. It is a follower for
video signals. It can be directly coupled to the previous stage
because there is no internal bias at the input pin. When output
is short to earth the IC enters power-save mode.
FEATURES
* Triple channels.
* Can be directly coupled to the previous circuit.
* Each output can drive two loads (75Ω×2).
* Output short circuit protection.
SOP-8
*Pb-free plating product number: A7623L
ORDERING INFORMATION
Order Number
Normal Lead Free Plating Package Packing
A7623-S08-R A7623L-S08-R SOP-8 Tape Reel
A7623-S08-T A7623L-S08-T SOP-8 Tube
A7623L-S08-R
(1) Packing Type
(2) Package Type
(3) Lead Plating
(1) R: Tape Reel, T: Tube
(2) S08: SOP-8
(3) L: Lead Free Plating, Blank: Pb/Sn
A7623
LINEAR INTEGRATED CIRCUIT
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PIN DESCRIPTIONS
PIN NO. PIN NAME DESCRIPTION
1 GND Ground connection
2 IN1
3 IN2
4 IN3
Direct-coupling input
Input composite/component video (RGB) signals.
The operating input signal level is 0.5V to 3.8V.
5 V
CC
Power supply
6 OUT3
7 OUT2
8 OUT1
Direct-coupling output
When short to ground a protection circuit operates, and the IC enters power-save
mode.
BLOCK DIAGRAM
GND
IN1
IN2
IN3 V
CC
OUT3
OUT2
OUT1
5
6
7
8
4
3
2
1
75 Ω
driver
75 Ω
driver
75 Ω
driver
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LINEAR INTEGRATED CIRCUIT
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ABSOLUTE MAXIMUM RATINGS
(Ta = 25 )℃
PARAMETER SYMBOL RATINGS UNIT
Power Supply Voltage V
CC
8.0 V
Power Dissipation 550 mW
Derating Rate at Ta=25°C P
D
5.5 °C/mW
Operating Temperature T
OPR
-25 ~ +75 °C
Storage Temperature T
STG
-55 ~ +125 °C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
ELECTRICAL CHARACTERISTICS
(Ta = 25°C , V
CC
= 5V, V
IN DC
=2.1V and load is two system drive)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Voltage V
CC
4.5 5.0 5.5 V
Supply Current I
CC
No signal 25.2 37.8 mA
Voltage Gain G
V
f = 1MHz, sine wave ,V
IN
= 2.0V
P-P
-1.0 -0.5 0 dB
Maximum Output Level V
O(MAX)
f = 1kHz, sine wave, THD = 1.0% 2.9 3.4 V
P-P
Frequency Characteristic C
F
10MHz / 1MHz, sine wave ,V
IN
= 1.0V
P-P
-3 0 1 dB
Inter Channel Crosstalk C
T
f = 4.43MHz, sine wave ,V
IN
= 2.0V
P-P
-60 dB
Total Harmonic Distortion THD f = 1kHz, sine wave, V
IN
= 1.0V
P-P
0.1 0.5 %
Differential Gain 75Ω Drive 1 DG1 0.4 1.0 %
Differential Phase 75Ω Drive 1 DP1 0.4 1.0 deg
Differential Gain 75Ω Drive 2 DG2 0.7 2.0 %
Differential Phase 75Ω Drive 2 DP2
V
IN
= 2.0VP-P, standard staircase signal
0.7 2.0 Deg
A7623
LINEAR INTEGRATED CIRCUIT
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QW-R121-014,A
TEST CIRCUIT
5
6
7
8
4
3
2
1
75 Ω
driver
75 Ω
driver
75 Ω
driver
+
75
470μ75
+
75
470μ75
+
75
470μ75
+
47μF 22nF
V
CC
= 5V
+
1μ
2.1V
1k
600
+
75
1000μ75
75
75
Fig.1
The circuit for driving one 75Ωoutput load.
The circuit for driving two 75Ω output loads is as
GND
sine wave
staircase signal
+
1μ
2.1V
1k
600
sine wave
staircase signal
+
1μ
2.1V
1k
600
sine wave
staircase signal
test point
A7623
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
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QW-R121-014,A
APPLICATION CIRCUIT
5
6
7
8
4
3
2
1
75 Ω
driver
75 Ω
driver
75 Ω
driver
22nF
GND
R1
Q1
R1
Q1
R1
Q1
Fig.2
+
47μF
V
CC
= 5V
+
1000μ75
75
VIDEO
OUT6
VIDEO
OUT5
+
1000μ75
75
VIDEO
OUT4
VIDEO
OUT3
+
1000μ75
75
VIDEO
OUT2
VIDEO
OUT1
A7623
LINEAR INTEGRATED CIRCUIT
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QW-R121-014,A
TYPICAL CHARACTERISTIC
Frequency, f (Hz)
Gain, G
V
(dB)
Fig. 3 Frequency Characteristic
100k 1M 100M
-40
-20
20
0
10M 0
-20
Frequency, f (Hz)
Gain, G
V
(dB)
Fig. 4 Crosstalk
100k 10M 100M
-80
-60
0
1M
-40
OPERATION NOTES
(1) 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.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
