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INTEGRATED CIRCUITS
DATA SHEET
TDA4881 Advanced monitor video controller
Preliminary specification File under Integrated Circuits, IC02 November 1992
Philips Semiconductors
Preliminary specification
Advanced monitor video controller
FEATURES · Fully DC controllable · 3 separate video channels · Input black level clamping · White level adjustment for 2 channels only · Brightness control with correct grey scale tracking · Contrast control for all 3 channels simultaneously · Cathode feedback to internal reference for cut-off control, which allows unstabilized video supply voltage · Current outputs for RGB signal currents · RGB voltage outputs to external peaking circuits · Blanking and switch-off input for screen protection · Sync on green operation possible QUICK REFERENCE DATA SYMBOL VP IP Vl(b-w) VO(b-w) IO(b-w) IM B Gnom Gv Cv Vbl Tamb supply current input voltage (black-to-white, pins 2, 5 and 8) output voltage (black-to-white, pins 19, 16 and 13) output current (black-to-white, pins 20, 17 and 14) peak output current (pins 20, 17 and 14) bandwidth nominal gain gain control range for 2 channels (relative to Gnom) contrast control range (relative to Gnom) brightness control range operating ambient temperature range nominal gain -3 dB nominal contrast and nominal gain PARAMETER positive supply voltage (pin 7) CONDITIONS MIN. TYP. 7.2 - - - - - 70 - -4 -20 -80 0 8.0 46 0.7 0.8 50 - - 1 - - - - GENERAL DESCRIPTION
TDA4881
The TDA4881 is a monolithic integrated RGB amplifier for colour monitor systems with super VGA performance, intended for DC or AC coupling of the colour signals to the cathodes of the CRT. With special advantages the circuit can be used in conjunction with the TDA4851.
MAX. 8.8 56 1.0 - - 100 - - +2 +3 +240 +70
UNIT V mA V V mA mA MHz dB dB dB mV °C
ORDERING INFORMATION EXTENDED TYPE NUMBER TDA4881 Note 1. SOT146-1; 1996 November 27. PACKAGE PINS 20 PIN POSITION DIL MATERIAL plastic CODE SOT146(1)
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Philips Semiconductors
Preliminary specification
Advanced monitor video controller
TDA4881
Fig.1 Block diagram and basic application circuit for DC and AC coupling.
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Philips Semiconductors
Preliminary specification
Advanced monitor video controller
PINNING SYMBOL BRC VI1 GC1 GND VI2 CC VP VI3 HBL CL GC3 FB3 VO3 IO3 FB2 VO2 IO2 FB1 Fig.2 Pin configuration VO1 IO1 PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 DESCRIPTION brightness control signal input Channel 1 gain control Channel 1 ground signal input Channel 2 contrast control supply voltage signal input Channel 3 horizontal blanking, switch off input clamping, vertical blanking gain control Channel 3 feedback Channel 3 voltage output Channel 3 current output Channel 3 feedback Channel 2 voltage output Channel 2 current output Channel 2 feedback Channel 1 voltage output Channel 1 current output Channel 1
TDA4881
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Philips Semiconductors
Preliminary specification
Advanced monitor video controller
FUNCTIONAL DESCRIPTION RGB input signals (0.7 V(p-p)) are capacitively coupled into the TDA4881 (pins 2, 5 and 8) from a low ohmic source and are clamped to an internal DC voltage (artificial black level). Composite signals will not disturb normal operations because an internal clipping circuit cuts all signal parts below black level. Channels 1 and 3 have a maximum total voltage gain of 6 dB (maximum contrast and maximum individual channel gain), Channel 2 of 4 dB (maximum contrast and nominal channel gain). With the nominal channel gain of 1 dB and nominal contrast setting the nominal black-to-white output amplitude is 0.8 V(p-p). DC voltages are used for brightness, contrast and gain control.
TDA4881
black level. The coupling capacitors are used in this way for black level storage. Because the threshold for the clamping pulse is higher than that for vertical blanking (pin 10) the rise and fall times of the clamping pulse have to be faster than 75 ns/V (1 V to 3.5 V). The vertical blanking pulse will be detected if the input voltage (pin 10) is higher than the threshold voltage for approximately 300 ns but does not exceed the threshold for the clamping pulse in the time between. During the vertical blanking pulse the input clamping is disabled to avoid misclamping in the event of composite input signals. The input signal is blanked and the artificial black level is inserted instead. Additionally the brightness is internally set to its nominal value, thus the output signal is at reference black level. The DC value of the reference black level will be adjusted by cut-off stabilization. During horizontal blanking (pin 9) the output signal is set to reference black level as previously described and output clamping is activated. If the voltage at pin 9 exceeds the switch off threshold the signal is blanked and switched to ultra black level for screen protection and spot suppression during V-flyback. Ultra black level is the lowest possible output voltage (at voltage outputs) and does not depend on cut-off stabilization. For cut-off stabilization (DC coupling to the CRT) respectively black level stabilization (AC coupling) the video signal at the cathode or the coupling capacitor is divided by an adjustable voltage divider and fed to the feedback inputs (pins 18, 15 and 12). During horizontal blanking time this signal is compared with an internal DC voltage of approximately 5.8 V. Any difference will lead to a reference black level correction by charging or discharging the integrated capacitor which stores the reference black level information between the horizontal blanking pulses.
Brightness control yields a simultaneous signal black level shift of the three channels relative to a reference black level. For nominal brightness (pin 1 open-circuit) the signal black level is equal to the reference black level. Contrast control is achieved by a voltage at pin 6 and affects the three channels simultaneously. To provide the correct white point, an individual gain control (pins 3 and 11) adjusts the signals of Channels 1 and 3 compared to the reference Channel 2. Gain setting effects contrast and brightness to achieve correct grey scale tracking. Each output stage provides a current output (pins 20, 17 and 14) and a voltage output (pins 19, 16 and 13). External cascode transistors reduce power consumption of the IC and prevent breakdown of the output transistors. Signal output currents and peaking characteristics are determined by external components at the voltage outputs and the video supply. The three channels have separate internal feedback loops which ensure large signal linearity and marginal signal distortion in spite of output transistor thermal VBE variation.
The clamping pulse (pin 10) is used for input clamping only. The input signals have to be at black level during the clamping pulse and are clamped to an internal artificial
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Philips Semiconductors
Preliminary specification
Advanced monitor video controller
TDA4881
Fig.3 Internal circuits.
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Philips Semiconductors
Preliminary specification
Advanced monitor video controller
LIMITING VALUES In accordance with the Absolute Maximum System (IEC 134) SYMBOL VP Vi Vext supply voltage (pin 7) input voltage range (pins 2, 5 and 8) external DC voltage ranges pins 20, 17 and 14 pins 19, 16 and 13 pins 1, 3, 6 and 11 pin 9 pin 10 Io IM Ptot Tstg Tamb Tj VESD average output current (pins 20, 17 and 14) peak output current (pins 20, 17 and 14) total power dissipation storage temperature range operating ambient temperature range junction temperature electrostatic handling for all pins (note 1) -0.1 -0.1 -0.1 -0.7 0 0 - -25 0 -25 -500 VP VP VP+0.7 VP +0.7 50 100 1200 +150 +70 +150 +500 PARAMETER 0 -0.1 MIN. 8.8 VP MAX.
TDA4881
UNIT V V V V V V mA mA mW °C °C °C V
no external voltages
Note to the Limiting Values 1. Equivalent to discharging a 200 pF capacitor through a 0 series resistor. THERMAL RESISTANCE SYMBOL Rth j-a PARAMETER from junction to ambient in free air THERMAL RESISTANCE 65 K/W
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Philips Semiconductors
Preliminary specification
Advanced monitor video controller
CHARACTERISTICS VP = 8.0 V, Tamb = +25 °C; all voltages measured to GND (pin 4); unless otherwise specified SYMBOL VP IP Vl(b-w) I2, 5, 8 PARAMETER supply voltage range (pin 7) supply current (pin 7) CONDITIONS MIN. 7.2 - - no clamping during clamping Brightness control V1 R1 Vbl1 input voltage range input resistance to VN1 black level voltage change at nominal V1 = 1.0 V; gain (pins 19, 16 and 13) V3, 11 open-circuit V1 = 6.0 V; V3, 11 open-circuit VN1 V6 I6 Cv input voltage for nominal brightness pin 1 open-circuit Contrast control (see note 2) input voltage range current contrast relative to nominal contrast V6 = 6.0 V; V3, 11 open-circuit V6 = 4.5 V; V3, 11 open-circuit V6 = 1.0 V; V3, 11 open-circuit Tr Gain control V3, 11 R3, 11 Gv VN3, N11 Feedback input Vint I18, 15, 12 internal reference voltage output current see note 3 during output clamping tbn -1.5 5.8 -1.0 input voltage range input resistance against VN3, N11 gain relative to nominal gain input voltage for nominal gain V6 = 4.5 V; V3, 11 = 6 V V6 = 4.5 V; V3, 11 = 1 V pin 3, 11 open-circuit see note 1 1.0 - - - - - 43 2 -4 4.6 tracking of RGB signals 2.5 V < V6 < 6 V; V3, 11 open-circuit see note 1 1.0 -5 - - - - - -1 3 0 -20 0 see note 1 1.0 - - - - - 50 -80 240 2.25 -0.1 ±50 TYP. 8.0 46
TDA4881
MAX. 8.8 56
UNIT V mA
Video signal inputs input voltage (black-to-white, pins 2, 5 and 8) DC current 0.7 - - 1.0 0.1 - V µA µA
6.0 - - - -
V k mV mV V
6.0 - - - - 0.5
V µA dB dB dB dB
6.0 - - - -
V k dB dB V
tbn -0.1
V µA
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Philips Semiconductors
Preliminary specification
Advanced monitor video controller
TDA4881
SYMBOL
PARAMETER
CONDITIONS
MIN. - 0.3
TYP.
MAX. - 1.0
UNIT
Voltage outputs (pins 19, 16 and 13) VO(b-w) Vbl signal output voltage (black-to-white value) black level voltage V3, 11 open; V6 = 4.5 V; Vl(b-w) = 0.7 V during output clamping; depending on black level adjustment; see note 4 during switch-off S/N signal-to-noise ratio see note 5 Frequency response at voltage outputs Gvf trO gain decrease by frequency response at pins 19, 16 and 13 rise time at voltage output (pins 19, 16 and 13) 70 MHz 10% to 90% amplitude; input rise time = 1 ns - - - 4.5 -3 5.0 dB ns 0.8 - V V
- -
0.1 -
0.3 44
V dB
Current outputs (pins 20, 17 and 14) lO(b-w) signal current (black-to-white) with peaking; see note 6 V20-19, 17-16, 14-13 HF saturation of output transistors Threshold voltages (see note 7) V9 threshold for horizontal blanking (blanking, output clamping) threshold for switch-off (blanking, minimum black level, no output clamping) R9 td9 V10 input resistance referenced to ground delay between horizontal blanking input and output signal blanking threshold for vertical blanking (blanking, no input clamping) threshold for clamping (input clamping, no blanking) I10 tr,f10 tw10 td10 input current rise and fall time for clamping pulse clamping pulse width transition 1 to 3.5 V; see Fig.4 V10 = 3 V see Fig.4 see Fig.4 1.2 5.8 1.4 6.5 1.6 6.8 V V IO = 50 mA IO = 100 mA - - - - 50 - - - - 100 2.0 2.2 mA mA V V
50 - 1.2 2.6 -3 - 0.6 -
80 35 1.4 3.0 -1 - - 300
110 60 1.6 3.5 - 75 - -
k ns V V µA ns/V µs ns
delay between vertical blanking input see Fig.4 and output signal blanking
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Philips Semiconductors
Preliminary specification
Advanced monitor video controller
Notes to the characteristics
TDA4881
1. Typical range is 1 to 6 V, the range can be increased (e.g. 0 to 7 V) to slightly increase the control range. 2. Open contrast control pin leads to undefined contrast setting. 3. The internal reference voltage can be measured at pins 18, 15 and 12 during output clamping in closed feedback loop. 4. Minimum guaranteed control range, the typical minimum black level voltage is 0.1 V. 5. The signal-to-noise ratio is calculated by the formula (frequency range 1 to 70 MHz): peak-to-peak value of the nominal signal output voltage -------------------------------------------------------------------------------------------------------------------------------------------------RMS value of the noise output voltage 6. The external RC combinations at pins 19, 16 and 13 enables peak currents during transients. 7. The internal threshold voltages are derived from an internally stabilized voltage. The internal pulses are generated if the input pulses are higher than the thresholds.
Fig.4 Timing of pulses at pin 10.
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Philips Semiconductors
Preliminary specification
Advanced monitor video controller
PACKAGE OUTLINE DIP20: plastic dual in-line package; 20 leads (300 mil)
TDA4881
SOT146-1
D seating plane
ME
A2
A
L
A1
c Z e b1 b 20 11 MH w M (e 1)
pin 1 index E
1
10
0
5 scale
10 mm
DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT mm inches A max. 4.2 0.17 A1 min. 0.51 0.020 A2 max. 3.2 0.13 b 1.73 1.30 0.068 0.051 b1 0.53 0.38 0.021 0.015 c 0.36 0.23 0.014 0.009 D
(1)
E
(1)
e 2.54 0.10
e1 7.62 0.30
L 3.60 3.05 0.14 0.12
ME 8.25 7.80 0.32 0.31
MH 10.0 8.3 0.39 0.33
w 0.254 0.01
Z (1) max. 2.0 0.078
26.92 26.54 1.060 1.045
6.40 6.22 0.25 0.24
Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION SOT146-1 REFERENCES IEC JEDEC EIAJ SC603 EUROPEAN PROJECTION
ISSUE DATE 92-11-17 95-05-24
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Philips Semiconductors
Preliminary specification
Advanced monitor video controller
SOLDERING Introduction There is no soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used. This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our "IC Package Databook" (order code 9398 652 90011). Soldering by dipping or by wave The maximum permissible temperature of the solder is 260 °C; solder at this temperature must not be in contact with the joint for more than 5 seconds. The total contact
TDA4881
time of successive solder waves must not exceed 5 seconds. The device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified maximum storage temperature (Tstg max). If the printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit. Repairing soldered joints Apply a low voltage soldering iron (less than 24 V) to the lead(s) of the package, below the seating plane or not more than 2 mm above it. If the temperature of the soldering iron bit is less than 300 °C it may remain in contact for up to 10 seconds. If the bit temperature is between 300 and 400 °C, contact may be up to 5 seconds.
DEFINITIONS Data sheet status Objective specification Preliminary specification Product specification Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. This data sheet contains target or goal specifications for product development. This data sheet contains preliminary data; supplementary data may be published later. This data sheet contains final product specifications.
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