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RGB Video Amplifier System for Monitors
U2203B
Description
The U2203B-A is a wideband video amplifier IC system
especially designed for use in high-resolution RGB moni-
tors. The IC includes three well matched video
amplifiers, three gated differential amplifiers for black-
level clamping and brightness control and the function for
simultaneously contrast control. Separate adjustment of
the maximum gain of each channel is also possible.
Features
D 3 channels, high bandwidth (90 MHz @ –3 dB)
D Matched attenuators for contrast control
D Black-level clamping for brightness control
D Independent gain control of each amplifier
D ESD protection according to MIL-STD. 883
Vs1 1
CONTRAST CAP 2
CONTRAST CAP 3
R VIDEO IN 4
SUPPLY
REG.
RED
1k
40
90
28 Vs1
27 R DRIVE
26 R CLAMP (–)
25 R VIDEO OUT
R CLAMP CAP 5
G VIDEO IN 6
GROUND 7
G CLAMP CAP 8
GREEN
1k
90
40
24 R CLAMP (+)
23 Vs2
22 G DRIVE
21 G CLAMP (–)
B VIDEO IN 9
B CLAMP CAP 10
Vin REF 11
CONTRAST 12
2.4V
REF
CONTRAST
CONTROL
Vs1 13
CLAMP GATE 14
1.4V
REF
BLUE
1k
90
40
20 G VIDEO OUT
19 G CLAMP (+)
18 B DRIVE
17 B CLAMP (–)
U2203B
16 B VIDEO OUT
15 B CLAMP (+)
95 10749
Figure 1. Block diagram
TELEFUNKEN Semiconductors
Rev. A2, 27-Jan-97
1 (7)

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U2203B
Pin Description
VS1
Ccontr
1
2
28 VS1
27 RR
Ccontr
3
26 VR–
Vin, R
4
Cclamp, R 5
Vin, G
6
GND
7
Cclamp, G 8
25 Vout, R
24 VR+
23 VS2
22 RG
21 VG–
Vin, B
9
20 Vout, G
Cclamp, B 10
19 VG+
VBias
11
18 RB
Vcontr
12
17 VB–
VS1 13
16 Vout, B
VGate
14 15 VB+
96 12388
Figure 2. Pinning
Pin Symbol
Function
1 VS1 Supply voltage
2 Ccontr Contrast cap.
3 Ccontr Contrast cap.
4 Vin, R Video input (R)
5 Cclamp, R Clamp cap. (R)
6 Vin, G Video input (G)
7 GND Ground
8 Cclamp, G Clamp cap. (G)
9 Vin, G Video input (B)
10 Cclamp, B Clamp cap. (B)
11 VBias Bias voltage (RGB-inputs)
12 Vcontr Contrast control
13 VS1 Supply voltage
14 VGate Inverted clamp gate
15 VB+ Clamp amplifier (B+)
16 Vin, B Video output (B)
17 VB– Clamp amplifier (B–)
18 RB Drive resistor (B)
19 VG+ Clamp amplifier (G+)
20 Vout, G Video output (G)
21 VG– Clamp amplifier (G–)
22 RG Drive resistor (G)
23 VS2 Supply voltage (outputs)
24 VR+ Clamp amplifier (R+)
25 Vout, R Video output (R)
26 VR– Clamp amplifier (R–)
27 RR Drive resistor (R)
28 VS1 Supply voltage
Absolute Maximum Ratings
Parameters
Supply voltage
Pins 1, 13, 28 and 23
Input voltage at all other pins
Video output current
Pins 16, 20 and 25
Junction temperature
Storage temperature range
Symbol
VS
Vin
IV
Tj
Tstg
Value
13.5
0 toVS
28
125
–40 to 125
Unit
V
V
mA
°C
°C
Operating Range
Parameters
Ambient temperature range
Supply voltage range
Pins 1, 13, 23 and 28
Symbol
Tamb
VS2, VS1
Value
0 to 80
11.0 to 13.0
Unit
°C
V
2 (7) TELEFUNKEN Semiconductors
Rev. A2, 27-Jan-97

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U2203B
Thermal Resistance
Junction ambient
Parameters
(DIP28)
Symbol
RthJA
Value
46
Unit
K/W
Electrical Characteristics
Test conditions unless otherwise specified, reference point Pin 7, Tamb = 25°C,
VS1 = VS2 = 12 V, V12 = 6 V (contrast); V14 = 0 V (inv. gating); V15 = V19 = V24 = 2 V (brightness)
Parameters
Test Conditions / Pins Symbol Min.
DC-values
Supply current
VS1 only,
Pins 1, 13 and 28
IS1
Input bias voltage
Input bias current
Switching voltage gating
Pin 11
Pins 4, 6 and 9
Pin 14
VinREF
IinREF
VG “L”
2.3
1
0.8
“on”
Switching voltage gating
“off”
Pin 14
VG “H”
Switching current gating
”on”
V14 = 0.8 V
Pin 14
IG “L”
–1
Switching current gating
”off”
V14 = 2.0 V
Pin 14
IG “H”
Charge current clamping
capacitor
V5,8,10 = 0 V
Pins 5, 8 and 10
ICL+
0.8
Discharge current clamping V5,8,10 = 5 V
capacitor
Pins 5, 8 and 10
ICL–
–1.2
Video outputs, VO
Low level
High level
Output offset between two
amplifiers
Pins 16, 20 and 25
V5,8,10 = 0 V
V5,8,10 = VS
V15, V19, V24 = 2 V
V15, V19, V24 = 4 V
VO“L”
VO“H”
DVO
(2 V)
DVO
(4 V)
8.0
Video gain
Maximum video gain
Middle video gain
Dynamic gain range
V15 = V19 = V24 = 4 V (brightness); fIN = 1 MHz
V12 = 12 V
GVmax
16.0
V12 = 5 V
GVmid
GVD
Video gain match
(any 2 outputs)
Video bandwidth
V12 = 12 V
V12 = 5 V
V12 = 2.2 V
1)
GVMmax
GVMmid
GVM–30
unpeaked (C = 0 pF)
optimal peaking
(C = 27 pF)
V12 = 12 V (f–3dB)
V12 = 12 V (f–3dB)
BWV
BWVP
Video cross talk
fIN = 10 kHz
fIN = 10 MHz
CT10kHz
CT10MHz
–50
Typ.
60
5
1.3
1.5
–0.01
5
1.0
–1.0
0.8
8.6
17.7
8.5
50
±0.1
±0.1
±0.3
65
90
–47
Max.
70
2.5
10
2.0
8
1.2
–0.8
1.0
±50
±50
1) Measured 30 dB below maximum gain
Unit
mA
V
mA
V
V
mA
mA
mA
mA
V
V
mV
mV
dB
dB
dB
dB
dB
dB
MHz
MHz
dB
dB
TELEFUNKEN Semiconductors
Rev. A2, 27-Jan-97
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U2203B
VS (+12V)
R Video in
75 W
G Video in
75 W
B Video in
75 W
100 mF
100 nF
100 nF
5 mF
10 kW
5 mF 100 nF
1
2
3
4
5
6
28
27
26
25
24
23
10 kW
7 22
U2203B
8
5 mF 100 nF
21
10 kW
9
20
10
5 mF 100 nF
11
19
18
Black level
gate I/P
10 kW
12
100 nF
13
14
17
16
15
51 W 100 W
C
R Clamp (–)
390 W
To cascade
driver (R)
100 nF
51 W 100 W
C
G Clamp (–)
390 W
To cascade
driver (G)
91 W
C
G Clamp (–)
390 W
To cascade
driver (B)
10 kW
93 7632
100 nF
10 kW
Contrast
control
0 ... 12 V
Black level
(brightness)
control
10 kW
10 nF
Figure 3. Typical application circuit
4 (7) TELEFUNKEN Semiconductors
Rev. A2, 27-Jan-97

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AC Characteristics
U2203B
20
18
16
14
12
10
8
6
4
2
0
1
95 10748
C = 0 pF
C = 10 pF
C = 27 pF
C = 47 pF
10
Frequency ( MHz )
100
1000
Figure 4. Gain vs. frequency (various peaking), V12 = 12 V (contrast), V15 = V19 = V24 = 4 V (brightness)
10
0
–10
–20
–30
–40
–50
–60
1
95 10747
10
Frequency ( MHz )
100
1000
Figure 5. Relative gain vs. frequency (no peaking), V12 = variable (contrast), V15 = V19 = V24 = 4 V (brightness),
0 dBrel = 17.7 dB, C = 0 pF
TELEFUNKEN Semiconductors
Rev. A2, 27-Jan-97
5 (7)