LM6104

LM6104 NSC | Alldatasheet

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Technical content

LM6104 Quad Gray Scale Current Feedback Amplifier June 1994 LM6104 Quad Gray Scale Current Feedback Amplifier General Description The LM6104 quad amplifier meets the requirements of bat- tery operated liquid crystal displays by providing high speed while maintaining low power consumption. Combining this high speed with high integration, the LM6104 conserves valuable board space in portable sys- tems with a cost effective, surface mount quad package. Built on National’s advanced high speed VIP TM (Vertically Integrated PNP) process, the LM6104 current feedback ar- chitecture is easily compensated for speed and loading con- ditions. These features make the LM6104 ideal for buffering grey levels in liquid crystal displays. Features (Typical unless otherwise noted) Y Low power I S e 875 mA/amplifier Y Slew rate 100V/ ms Y b3dB bandwidth (R F e 1k X) 30 MHz Y High output drive g5V into 100 X Y Wide operating range V S e 5V to g12V Y High integration Quad surface mount

Applications

Y Grey level buffer for liquid crystal displays Y Column buffer for portable LCDs Y Video distribution amplifiers, video line drivers Y Hand-held, high speed signal conditioning Typical Application LCD Buffer Application for Grey Levels TL/H/11979–1 Connection Diagram TL/H/11979–2 Order Number LM6104M See NS Package Number M14A VIPTM is a trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage 24V Differential Input Voltage g6V Input Voltage gSupply Voltage Inverting Input Current 15 mA Soldering Information Vapor Phase (60s) 215 Infrared (15s) 220 §C Storage Temperature Range b65§C s TJ s a150§C Maximum Junction Temperature 150 §C ESD Rating (Note 2) 2000V Operating Ratings Supply Voltage Range 4.75V to 24V Junction Temperature Range (Note 3) LM6104M b20§ s TJ s a80§C

Electrical Characteristics

The following specifications apply for V ae 8V, V beb 5V, R L e RF e 2k X and 0 § s TJ s 60§C unless otherwise noted. Symbol Parameter Conditions LM6104M UnitsTypical Limits (Note 4) (Note 5) VOS Input Offset Voltage 10 30 mV max IB Inverting Input Bias Current 5.0 20 mA max Non-Inverting Input Bias Current 0.5 2 mA max IS Supply Current V O e 0V 3.5 4.0 mA max ISC Output Source Current V O e 0V 60 45 mA IIN(b) eb 100 mA min Output Sink Current V O e 0V 60 45 mA IIN(b) e 100 mA min VO Positive Output Swing I IN(b) eb 100 mA 6.5 6.1 V min Negative Output Swing I IN(b) e 100 mA b3.5 b3.1 V max PSRR Power Supply Rejection Ratio V S e g4t o g10V 70 60 dB min 100 mV pp @ 100 kHz 40 30 dB min RT Transresistance 10 5 M X min SR Slew Rate (Note 6) 100 55 V/ ms min BW Bandwidth A V eb 1 7.5 5.0 MHzRIN e RF e 2k X Amp-to-Amp Isolation R L e 2k X 60 dBF e 1 MHz CMVR Common Mode Voltage Range V a b 1.4V VVb a 1.4V CMRR Common Mode Rejection Ratio 60 dB tS Settling Time 0.05%, 5V Step, A V eb 1 240 nsRF e RS e 2k X,V S e g5V Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its rated operating conditions. Operating ratings indicate conditions the device is intended to be functional, but device parameter specifications may not be guaranteed under the conditions. Note 2: Human body model 1.5 k X and 100 pF. This is a class 2 device rating. Note 3: Thermal resistance of the SO package is 98 §C/W. When operating at T A e 80§C, maximum power dissipation is 700 mW. Note 4: Typical values represent the most likely parametric norm. Note 5: All limits guaranteed at operating temperature extremes. Note 6: AV eb 1 with R IN e RF e 2k X. Slew rate is calculated from the 25% to the 75% point on both rising and falling edges. Output swing is b0.6V to a5.6V and 5.6V to 0.6V.

Typical Performance Characteristics Closed Loop Gain Frequency Response vs Amplifier Isolation Amplifier to Supply Voltage Supply Current vs AV eb 1 Large Signal Pulse Response AV eb 1, R F e RG Frequency Response vs R F IIN e g100 mA VS e g5V VOUT Referred to Supplies vs Source Current LM6104 Output Voltage vs Sink Current LM6104 Output Voltage TL/H/11979–3

The small-signal bandwidth of conventional voltage feed- back amplifiers is inversely proportional to the closed-loop gain based on the gain-bandwidth concept. In contrast, the current feedback amplifier topology, such as the LM6104, enables a signal bandwidth that is relatively independent of the amplifier’s gain (see typical curve Frequency Response vs Closed Loop Gain). FEEDBACK RESISTOR SELECTION: R F Current feedback amplifier bandwidth and slew rate are controlled by R F.R F and the amplifier’s internal compensa- tion capacitor set the dominant pole in the frequency re- sponse. The amplifier, therefore, always requires a feed- back resistor, even in unity gain. Bandwidth and slew rate are inversely proportional to the value of R F (see typical curve Frequency Response vs R F). This makes the amplifier especially easy to compensate for a desired pulse response (see typical curve Large Signal Pulse Response). Increased capacitive load driving capabili- ty is also achieved by increasing the value of R The LM6104 has guaranteed performance with a feedback resistor of 2 k X. CAPACITIVE FEEDBACK It is common to place a small lead capacitor in parallel with feedback resistance to compensate voltage feedback am- plifiers. Do not place a capacitor across R F to limit the band- width of current feedback amplifiers. The dynamic imped- ance of capacitors in the feedback path of the LM6104, as with any current feedback amplifier, will cause instability.

LM6104 Quad Gray Scale Current Feedback Amplifier Physical Dimensions inches (millimeters) 14-Pin SO Package Order Number LM6104M LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.

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