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NTE7137 Integrated Circuit Advanced Monitor Video Controller
Description: The NTE7137 is a monolithic integrated RGB amplifier in a 20-Lead DIP type package designed for color monitor systems with super VGA performance. It is intended for DC or AC coupling of the color signals to the cathodes of a CRT. Features: D Fully DC Controllable D 3 Separate Video Channels D Input Black Level Clamping D White Level Adjustment for 2 Channels Only D Brightness Control with Correct Grey Scale Tracking D Contrast Control for All 3 Channels Simultaneously D Cathode Feedback to Internal Reference for Cut-Off Control, Which Allows Unstabilized Video Supply Voltage D Current Outputs for RGB Signal Currents D RGB Voltage Outputs to External Peaking Circuits D Blanking and Switch-Off Input for Screen Protection D Sync On Green Operation Possible Absolute Maximum Ratings: Supply Voltage (Pin7), VP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +8.8V Input Voltage Range (Pin2, Pin5, Pin8), Vi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.1 to VP External DC Voltage Ranges, Vext Pin14, Pin17, Pin14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.1 to VP Pin13, Pin16, Pin19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No External Voltages Pin1, Pin3, Pin6, Pin11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.1 to VP Pin9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.1 to VP+0.7V Pin10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.1 to VP+0.7V0 Average Output Current (Pin14, Pin17, Pin20), Io . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 50mA Peak Output Current (Pin14, Pin17, Pin20), IM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 100mA Total Power Dissipation, Ptot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200mW Electrostatic Handling for All Pins (Note 1), Vesd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500V Operating Junction Temperature Range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25 to +150C Operating Ambient Temperatrure Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25 to +150C Thermal Resistance, Junction-to-Ambient (In Free Air), RthJA . . . . . . . . . . . . . . . . . . . . . . . . 65K/W Note 1. Equivalent to discharging a 200pF capacitor through a 0 series resistor.
Electrical Characteristics: (VP = 8V, TA = +25C, Note 2 unless otherwise specified)
Parameter Supply Supply Voltage Range (Pin7) Supply Current (Pin7) Video Signal Inputs Input Voltage (Black-to-White, Pin2, Pin5, Pin8) DC Current Brightness Control Input Voltage Range Input Resistance to VN1 Black Level Voltage Change at Nominal Gain (Pin19, Pin16, Pin13) Input Voltage for Nominal Brightness Contrast Control (Note 4) Input Voltage Range Current Contrast Relative to Nominal Contrast V6 I6 Cv V1 = 6V, V3, 11 Open-Circuit V1 = 4.5V, V3, 11 Open-Circuit V1 = 1V, V3, 11 Open-Circuit Tracking of RGB Signals Gain Control Input Voltage Range Input Resistance Against VN3, N11 Gain Relative to Nominal Gain Input Voltage for Nominal Gain Feedback Input Input Voltage Range Output Current Voltage Outputs (Pin19, Pin16, Pin13) Signal Output Voltage (Black-to-White Value) Black Level Voltage VO(b-w) Vbl V3, 11 Open, V6 = 4.5V, VI(b-w) = 0.7V During Output Clamping, Depending on Black Level Adjustment, Note 6 During Switch-Off Signal-to-Noise Ratio S/N - 0.3 0.8 - - 1.0 V V V3, 11 Note 5 tbn -1.5 5.8 -1.0 tbn -0.1 V A I18, 15, 12 During Output Clamping V3, 11 R3, 11 Gv V6 = 4.5V, V3, 11 = 6V V6 = 4.5V, V3, 11 = 1V VN3, N11 Pin3, Pin11 Open Circuit Note 3 1.0 - - - - - 43 2 -4 4.6 6.0 - - - - V k dB dB V Tr 2.5V < V6 < 6V, V3, 11 Open Circuit Note 3 1.0 -5 - - - - - -1 3 0 -20 0 6.0 - - - - 0.5 V A dB dB dB dB V1 R1 Vbl1 VN1 V1 = 1V, V3, 11 Open-Circuit V1 = 6V, V3, 11 Open-Circuit Pin1 Open-Circuit Note 3 1.0 - - - - - 50 -80 240 2.25 6.0 - - - - V k mV mV V VI(b-w) I2, 5, 8 No Clamping During Clamping - -0.1 50 0.7 - - 1.0 +0.1 - V A A VP IP 7.2 - 8.0 46 8.8 56 V mA Symbol Test Conditions Min Typ Max Unit
- -
0.1 -
0.3 44
V dB
Note 2. All voltages measured to GND (Pin4). Note 3. Typical range is 1 to 6V, the range can be increased (e.g. 0 to 7V) to slightly increase the control range. Note 4. Open contrast control pin leads to undefined contrast setting. Note 5. The internal reference voltage can be measured at Pin18, Pin15, and Pin12 during output clamping in closed feedback loop. Note 6. Minimum guaranteed control range, the typical minimum black level voltage is 0.1V.
Electrical Characteristics (Cont'd): (VP = 8V, TA = +25C, Note 2 unless otherwise specified)
Parameter Frequency Response at Voltage Outputs Gain Decreases by Frequency Response at Pin19, Pin16, Pin13 Rise Time at Voltage Output (Pin19, Pin16, Pin13) Current Outputs (Pin20, Pin17, Pin14) Signal Current (Black-to-White) HF Saturation of Output Transistors IO(b-w) With Peaking, Note 7 V20-19,
17-16, 14.13
Symbol Gvf trO
Test Conditions 70MHz 10% to 90% Amplitude, Input Rise Time = 1ns
Min - -
Typ - 4.5
Max -3 5.0
Unit dB ns
- - - - 1.2 5.8 IO = 50mA IO = 100mA
50 - - - 1.4 6.5
- 100 2.0 2.2 1.6 6.8
mA mA V V V V
Threshold Voltages (Note 8) Threshold for Horizontal Blanking (Blanking, Output Clamping) Threshold for Switch-Off (Blanking, Minimum Black Level, No Output Clamping) Input Resistance Referenced to GND Delay Between Horizontal Blanking Input and Output Signal Blanking Threshold for Vertical Blanking (Blanking, No Input Clamping) Threshold for Clamping (Input Clamping, No Blanking) Input Current Rise and Fall Time for Clamping Pulse Clamping Pulse Width Delay Between Vertical Blanking Input and Output Signal Blanking I10 tr, f10 tw10 td10 Transition 1 to 3.5V V10 = 3V Rg td9 V10 V9
50 - 1.2 2.6 -3 - 0.6 -
80 35 3.0 3.0 -1 - - 300
110 60 3.5 3.5 - 75 - -
k ns V V A ns/V s ns
Note 2. All voltages measured to GND (Pin4). Note 7. The external RC combination at Pin19, Pin16 and Pin13 enables peak currents during transients. Note 8. 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.
Functional Description: RGB input signals (0.7VP-P) are capacitively coupled into the NTE7137 (Pin2, Pin5, and Pin8) from a low ohmic source and are clamped to an internal DC voltage (artificial balck level). Composite signals will not disturb normal operations because an internal clipping circuit cuts all signal parts below black level. Channes 1 and 3 have a maximum total voltage gain of 6dB (maximum contrast and maximum individual channel gain), Channel 2 of 4dB (maximum contrast and nominal channel gain). With the nominal channel gain of 1dB and nominal contrast setting the nominal black-to-white output amplitude is 0.8VP-P. DC voltages are used for brightness, contrast and gain control. Brightness control yeilds a simultaneous signal black level shift of the three channels relative to a reference black level. For nominal brightness (Pin1 open-circuit) the signal black level is equal to the reference black level. Contrast control is achieved by a voltage at Pin6 and affects the three channels simultaneously. To provide the correct white point, an individual gain control (Pin3 and Pin11) adjusts the signals of Channels 1 and 3 compared to the reference Channel 2. Gain setting affects contrast and brightness to achieve correct grey scale tracking. Each output stage provides a current output (Pin20, Pin17 and Pin14) and a voltage output (Pin19, Pin16 and Pin13). 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 (Pin10) 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 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 (Pin10) the rise and fall times of the clamping pulse have to be faqster than 75ns/V (1V to 3.5V). The vertical blanking pulse will be detected if the input voltage (Pin10) is higher than the threshold voltage for approximately 300ns 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 levels. The DC value of the reference black level will be adjusted by cut-off stabilization. During horizontal blanking (Pin9) the output signal is set to reference black level as previously described and output clamping is activated. If the voltage at Pin9 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 couplking) the video signal at the cathode or the coupling capacitor is divided by an adjustable voltage divider and fed to the feedback inputs (Pin18, Pin15 and Pin12). During horizontal blanking time this signal is compared with an internal DC voltage of approzimately 5.8V. 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.
Pin Connection Diagram
Brightness Control 1 Signal Input Ch1 2 Gain Control Ch1 3 GND 4 Signal Input Ch2 5 Contrast Control 6 VP 7 Signal Input Ch3 8 Horizontal Blanking, Swith Off 9 Input Clamping, Vertical Blanking 10
20 19 18 17 16 15 14 13 12 11
Current Output Ch1 Voltage Output Ch1 Feedback Ch1 Current Output Ch2 Voltage Output Ch2 Feedback Ch2 Current Output Ch3 Voltage Output Ch3 Feedback Ch3 Gain Control Ch3
20 1
11 .280 (7.12) Max 10
.995 (25.3) Max
.300 (7.62)
.280 (7.1)
.100 (2.54)
.125 (3.17) Min
.385 (9.8)

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