Document
TK15411
75 Ω VIDEO LINE DRIVER FEATURES
s Superimpose Circuit for Two-Level (45 and 140 IRE) Character Generation s Fixed Gain (6 dB) s Internal 75 Ω Driver with Clamp Circuit s Very Small Output Capacitor Using SAG Function Pin s Active High ON/OFF Control s Very Low Standby Current (typ. ISTBY ≤ 25 µA) 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 TK15411 is a single-channel video line driver IC that takes a standard video analog input and provides a buffered analog output for driving a 150 Ω load. The standard video input signal (1 VP-P typical) is internally clamped to 1.25 V and amplified 6 dB to produce 2 VP-P (typical) into a series 75 Ω resistor and 75 Ω cable load. The internal 1.5 kΩ SAG function resistor provides gain compensation for low frequency signals. The built-in superimpose circuit provides two levels (45 and 140 IRE) of character generation to the video signal. During standby (Pin 5 grounded), the TK15411 consumes only 125 µW of power. Nominal power dissipation (no input) is typically 73 mW. The TK15411M is available in the SOT23L-8 surface mount package.
TK15411
INPUT
OUTPUT
01S
VCC SUPERIMPOSITION 2
SAG GND
SUPERIMPOSITION 1
STANDBY
BLOCK DIAGRAM
VCC
Logic
75 Ω Driver 1.5 kΩ
ORDERING INFORMATION
5 kΩ 5 kΩ
GND
TK15411M
Tape/Reel Code
TAPE/REEL CODE
TL: Tape Left
January 2000 TOKO, Inc.
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TK15411
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 +85 °C
TK15411M ELECTRICAL CHARACTERISTICS
Test conditions: VCC = 5.0 V, VIN = 1.0 VP-P, RL = 150 Ω, TA = 25 °C unless otherwise specified.
SYMBOL ICC ISTBY IOS VTHL(SUPER) VTLH(SUPER) VTHL(STBY) VTLH(STBY) VCMP VCHA1 VCHA2 GVA DG DP fr PARAMETER Supply Current Standby Supply Current Standby Terminal Current Superimpose Threshold Voltage (High to Low) Superimpose Threshold Voltage (Low to High) Standby Threshold Voltage (High to Low) Standby Threshold Voltage (Low to High) Clamp Voltage Character Level 1 Character Level 2 Voltage Gain Differential Gain Differential Phase Frequency Response TEST CONDITIONS No input Pin 5 Grounded Pin 5 in Standby mode Pin 3, Pin 4 Pin 3, Pin 4 Pin 5 Operating to Standby mode Pin 5 Standby to Operating mode Pin 1 Input terminal Pin 7 SAG terminal Pin 7 SAG terminal fin = 1 MHz Staircase signal input Staircase signal input fin = 1 MHz / 5 MHz GND 2.00 GND 2.00 1.05 35 130 5.45 -3.0 -3.0 1.25 45 140 5.95 +1.3 +0.2 -0.4 MIN TYP 14.5 25.0 25.0 MAX 20.0 50.0 50.0 0.80 VCC 0.60 VCC 1.45 55 150 6.45 +3.0 +3.0 UNITS mA µA µA V V V V V IRE IRE dB % deg dB
Note 1: Power dissipation is 200 mW in free air. Derate at 1.6 mW/°C for operation above 25°C.
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January 2000 TOKO, Inc.
TK15411
TEST CIRCUIT
VCC TP5 TP4 VCC = 5.0 V + 33 µF
Input TP1 75 Ω
+ 4.7 µF +
Output VOUT 2.0 = VP-P TP2
33 µF + TP3 33 µF 75 Ω 75 Ω
Output Truth Table Pin 3 L L H H Pin 4 L H L H Output Pin 1 VCHA1 VCHA2 VCHA2
MEASUREMENT METHOD 1. Supply Current (ICC) The Pin 2 current is measured with no input signal and the Standby Pin (Pin 5) open. 2. Standby Supply Current (ISTBY) The Pin 2 current is measured when the Standby Pin (Pin 5) is connected to ground. 3. Standby Terminal Current (IOS) The Pin 5 current is measured when the Standby Pin (Pin 5) is connected to ground. 4. Threshold Voltage (High to Low) (VTHL(STBY)) The Pin 5 voltage is measured at the point which changes the device from operating mode into standby mode.
January 2000 TOKO, Inc.
Page 3
TK15411
MEASUREMENT METHOD (CONT.) 5. Threshold Voltage (Low to High) (VTLH(STBY)) The Pin 5 voltage is measured at the point which changes the device from standby mode into operating mode. 6. Threshold Voltage (High to Low) (VTHL(SUPER)) The voltage at TP4 and TP5 is slowly decreased. The TP4 and TP5 voltage level is measured at the point at which the video signal is applied to TP2. 7. Threshold Voltage (Low to High) (VTLH(SUPER)) The voltage at TP4 and/or TP5 is slowly increased. The TP4 and TP5 voltage levels are measured at the point at which the appropriate character signal per the output truth table is applied to TP2. 8. Clamp Voltage (VCMP) The DC voltage at Pin 1 is measured with no input signal. 9. Character Level 1 (VCHA1) The character level 1 equation is as follows: VCHA1 = (V2 - V1)/(1/140) Where V1 is the measured voltage at TP3 when TP4 and TP5 are at a low level and V2 is the measured voltage at TP3 when TP4 is at a high level and TP5 is at a low level. (V2 is also the voltage measured at TP3 when TP4 and TP5 are both at high level.) 10. Character Level 2 (VCHA2) The character level 2 equation .