TK15408
75
Ω
VIDEO LINE DRIVER
FEATURES
s
Fixed Gain (6 dB)
s
Internal 75
Ω
Drivers
s
Very Small Output Capacitor Using SAG Function Pin
s
Internal Clamping Circuit
s
Single +5 V Power Supply Operation
APPLICATIONS
s
s
s
s
s
s
Video Equipment
Digital Cameras
CCD Cameras
TV Monitors
Video Tape Recorders
LCD Projectors
DESCRIPTION
Operating from a single +5 V supply, the TK15408 is a dual
video driver IC that takes standard video signals as analog
inputs and provides buffered analog outputs for driving
150
Ω
loads (series 75
Ω
resistor and 75
Ω
cable load).
Both amplifiers have a fixed gain of 6 dB with internal
clamping circuits. Each input is clamped at 1.29 V and
amplified 6 dB to produce 2 V
P-P
(typical) into a series
75
Ω
resistor and 75
Ω
cable load. The internal 1.5 k SAG
function resistors provide gain compensation for low
frequency signals. Nominal power dissipation (no input) is
typically 76 mW. The TK15408 is ideally suited for S-VHS
systems.
The TK15408M is available in the very small SOT23L-8
surface mount package.
TK15408
SAG_A
OUTPUT_A
INPUT_A
01S
VCC
GND
INPUT_B
SAG_B
OUTPUT_B
BLOCK DIAGRAM
5 kΩ
-
75
Ω
Driver
5 kΩ
1.5 kΩ
VCC
+
ORDERING INFORMATION
TK15408M
Tape/Reel Code
5 kΩ
TAPE/REEL CODE
TL: Tape Left
December 1999 TOKO, Inc.
+
75
Ω
Driver
-
5 kΩ
1.5 kΩ
Page 1
TK15408
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ........................................................... 6 V
Operating Voltage Range .............................. 4.5 to 5.5 V
Power Dissipation (Note 1) ................................ 200 mW
Storage Temperature Range ................... -55 to +150
°C
Operating Temperature Range ...................-25 to +75
°C
TK15408M ELECTRICAL CHARACTERISTICS
Test conditions: V
CC
= 5.0 V, V
IN
= 1.0 V
P-P
, R
L
= 150
Ω,
T
A
= 25
°C
unless otherwise specified.
SYMBOL
I
CC
V
CMP
GVA
DG
DP
fr
PARAMETER
Supply Current
Clamp Voltage
Voltage Gain
Differential Gain
Differential Phase
Frequency Response
TEST CONDITIONS
No input
Pin 2, Pin 3 Input terminal
f
in
= 1 MHz
Staircase signal input
Staircase signal input
f
in
= 1 MHz / 5 MHz
MIN
TYP
15.1
MAX
21.0
1.50
6.2
+3.0
+3.0
UNITS
mA
V
dB
%
deg
dB
1.10
5.2
-3.0
-3.0
1.29
5.7
+0.6
-0.1
-0.3
Note 1: Power dissipation is 200 mW in free air. Derate at 1.6 mW/°C for operation above 25°C.
Page 2
December 1999 TOKO, Inc.
TK15408
TEST CIRCUIT
33 µF
+
TP2
75
Ω
TP3
OUTPUT_A
+
SAG_A
33 µF
TP1
+
4.7 µF
75
Ω
TP4
+
4.7 µF
75
Ω
SAG_B
INPUT_B
GND
33 µF
+
OUTPUT B
+
TP5
75
Ω
TP6
INPUT_A
VCC
+
33 µF
5.0 V
75
Ω
V
CC
75
Ω
33 µF
MEASUREMENT METHOD
1. Supply Current (I
CC
)
The Pin 7 current is measured with no input signal.
2. Clamp Voltage (V
CMP
)
The DC voltage at Pin 2 (Pin 3) is measured with no input signal.
3. Voltage Gain (GVA)
The voltage gain equation is as follows:
GVA = 20 log
10
V2/V1
Where V1 is the input voltage at TP1 (TP4) and V2 is the measured voltage at TP2 (TP5).
4. Differential Gain (DG)
The differential gain is measured at TP3 (TP6) when a staircase waveform of 10 steps is applied to TP1 (TP4).
5. Differential Phase (DP)
The differential phase is measured at TP3 (TP6) when a staircase waveform of 10 steps is applied to TP1 (TP4).
6. Frequency Response (fr)
The frequency response equation is as follows:
fr = 20 log
10
V2/V1
Where V1 is the measured TP3 (TP6) voltage when the TP1 (TP4) input frequency is set to 1 MHz and V2 is the measured
TP3 (TP6) voltage when the TP1 (TP4) input frequency is set to 5 MHz.
December 1999 TOKO, Inc.
Page 3
TK15408
TYPICAL PERFORMANCE CHARACTERISTICS
SUPPLY CURRENT
VS.
TEMPERATURE
20
VCC = 5.0 V,
No Input
SUPPLY CURRENT
VS.
SUPPLY VOLTAGE
20
TA = 25
°C,
No Input
18
ICC (mA)
18
16
14
12
10
-50
ICC (mA)
0
TA (°C)
50
100
16
14
12
10
4.0
4.5
5.0
VCC (V)
5.5
6.0
VOLTAGE GAIN
VS.
TEMPERATURE
8.0
VCC = 5.0 V,
fin = 1 MHz,
VIN = 1 VP-P
VOLTAGE GAIN
VS.
SUPPLY VOLTAGE
8.0
TA = 25
°C,
fin = 1 MHz,
VIN = 1 VP-P
7.0
GVA (dB)
GVA (dB)
7.0
6.0
6.0
5.0
5.0
4.0
-50
0
TA (°C)
50
100
4.0
4.0
4.5
5.0
VCC (V)
5.5
6.0
FREQUENCY RESPONSE
VS.
TEMPERATURE
0.5
fin = 1/5 MHz,
VIN = 1 VP-P
FREQUENCY RESPONSE
VS.
SUPPLY VOLTAGE
0.5
fin = 1/5 MHz,
VIN = 1 VP-P
0.0
0.0
fr (dB)
fr (dB)
-0.5
-0.5
-1.0
-1.0
-1.5
-50
0
TA (°C)
50
100
-1.5
4.0
4.5
5.0
VCC (V)
5.5
6.0
Page 4
December 1999 TOKO, Inc.
TK15408
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
CLAMP VOLTAGE
VS.
TEMPERATURE
1.5
VCC = 5.0 V,
Pin 2
CLAMP VOLTAGE
VS.
SUPPLY VOLTAGE
1.5
TA = 25
°C,
Pin 2
1.4
VCMP (V)
VCMP (V)
1.4
1.3
1.2
1.1
1.0
4.0
1.3
1.2
1.1
1.0
-50
0
TA (°C)
50
100
4.5
5.0
VCC (V)
5.5
6.0
DIFFERENTIAL GAIN
VS.
TEMPERATURE
6
4
2
VCC = 5.0 V,
VIN = 1 VP-P
DIFFERENTIAL GAIN
VS.
SUPPLY VOLTAGE
10
TA = 25
°C
VIN = 1 VP-P
0
DG (%)
DG (%)
0
-2
-10
-20
-4
-6
-50
-30
4.0
0
TA (°C)
50
100
4.5
5.0
VCC (V)
5.5
6.0
DIFFERENTIAL PHASE
VS.
TEMPERATURE
6
4
2
VCC = 5.0 V,
VIN = 1 VP-P
DIFFERENTIAL PHASE
VS.
SUPPLY VOLTAGE
6
4
2
TA = 25
°C,
VIN = 1 VP-P
DP (deg)
0
-2
-4
-6
-50
DP (deg)
0
TA (°C)
50
100
0
-2
-4
-6
4.0
4.5
5.0
VCC (V)
5.5
6.0
December 1999 TOKO, Inc.
Page 5
Special Edition for Assessment Centres
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