LM6104 Quad Gray Scale Current Feedback Amplifier General Description Features (Typical unless otherwise noted) The LM6104 quad amplifier meets the requirements of battery 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 systems with a cost effective, surface mount quad package. Built on National’s advanced high speed VIPTM (Vertically Integrated PNP) process, the LM6104 current feedback architecture is easily compensated for speed and loading conditions. These features make the LM6104 ideal for buffering grey levels in liquid crystal displays. Y Y Y Y Y Y Low power Slew rate b 3dB bandwidth (RF e 1 kX) High output drive Wide operating range High integration IS e 875 mA/amplifier 100V/ms 30 MHz g 5V into 100X VS e 5V to g 12V Quad surface mount Applications Y Y Y Y Grey level buffer for liquid crystal displays Column buffer for portable LCDs Video distribution amplifiers, video line drivers 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 TL/H/11979 RRD-B30M115/Printed in U. S. A. LM6104 Quad Gray Scale Current Feedback Amplifier June 1994 Absolute Maximum Ratings (Note 1) Storage Temperature Range If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage Differential Input Voltage 24V 150§ C ESD Rating (Note 2) 2000V Operating Ratings g 6V g Supply Voltage Input Voltage Inverting Input Current Soldering Information Vapor Phase (60s) Infrared (15s) b 65§ C s TJ s a 150§ C Maximum Junction Temperature Supply Voltage Range 4.75V to 24V Junction Temperature Range (Note 3) b 20§ s TJ s a 80§ C LM6104M 15 mA 215§ C 220§ C Electrical Characteristics The following specifications apply for V a e 8V, Vb e b5V, RL e RF e 2 kX and 0§ s TJ s 60§ C unless otherwise noted. LM6104M Symbol Parameter Conditions Typical (Note 4) Limits (Note 5) Units 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 VO e 0V 3.5 4.0 mA max ISC Output Source Current VO e 0V IIN(b) e b100 mA 60 45 mA min Output Sink Current VO e 0V IIN(b) e 100 mA 60 45 mA min Positive Output Swing IIN(b) e b100 mA Negative Output Swing IIN(b) e 100 mA Power Supply Rejection Ratio VS e g 4 to g 10V VO PSRR 100 mV pp RT @ 100 kHz Transresistance 6.5 6.1 V min b 3.5 b 3.1 V max 70 60 dB min 40 30 dB min 10 5 MX min SR Slew Rate (Note 6) 100 55 V/ms min BW Bandwidth AV e b1 RIN e RF e 2 kX 7.5 5.0 MHz Amp-to-Amp Isolation RL e 2 kX F e 1 MHz 60 dB V a b 1.4V Vb a 1.4V V 60 dB 240 ns CMVR Common Mode Voltage Range CMRR Common Mode Rejection Ratio tS Settling Time 0.05%, 5V Step, AV e b1 RF e RS e 2 kX, VS e g 5V 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 kX 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 TA 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 e b 1 with RIN e RF e 2 kX. Slew rate is calculated from the 25% to the 75% point on both rising and falling edges. Output swing is b 0.6V to a 5.6V and 5.6V to 0.6V. 2 Typical Performance Characteristics Frequency Response vs Closed Loop Gain Amplifier to Amplifier Isolation Supply Current vs Supply Voltage Large Signal Pulse Response AV e b1 Frequency Response vs RF AV e b1, RF e RG VOUT Referred to Supplies VS e g 5V IIN e g 100 mA LM6104 Output Voltage vs Source Current LM6104 Output Voltage vs Sink Current TL/H/11979 – 3 3 Applications Information Bandwidth and slew rate are inversely proportional to the value of RF (see typical curve Frequency Response vs RF). This makes the amplifier especially easy to compensate for a desired pulse response (see typical curve Large Signal Pulse Response). Increased capacitive load driving capability is also achieved by increasing the value of RF. The LM6104 has guaranteed performance with a feedback resistor of 2 kX. CURRENT FEEDBACK TOPOLOGY The small-signal bandwidth of conventional voltage feedback 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: RF CAPACITIVE FEEDBACK It is common to place a small lead capacitor in parallel with feedback resistance to compensate voltage feedback amplifiers. Do not place a capacitor across RF to limit the bandwidth of current feedback amplifiers. The dynamic impedance of capacitors in the feedback path of the LM6104, as with any current feedback amplifier, will cause instability. Current feedback amplifier bandwidth and slew rate are controlled by RF. RF and the amplifier’s internal compensation capacitor set the dominant pole in the frequency response. The amplifier, therefore, always requires a feedback resistor, even in unity gain. 4 5 LM6104 Quad Gray Scale Current Feedback Amplifier Physical Dimensions inches (millimeters) 14-Pin SO Package Order Number LM6104M NS Package Number M14A 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 systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Europe Fax: (a49) 0-180-530 85 86 Email: cnjwge @ tevm2.nsc.com Deutsch Tel: (a49) 0-180-530 85 85 English Tel: (a49) 0-180-532 78 32 Fran3ais Tel: (a49) 0-180-532 93 58 Italiano Tel: (a49) 0-180-534 16 80 National Semiconductor Hong Kong Ltd. 13th Floor, Straight Block, Ocean Centre, 5 Canton Rd. Tsimshatsui, Kowloon Hong Kong Tel: (852) 2737-1600 Fax: (852) 2736-9960 National Semiconductor Japan Ltd. Tel: 81-043-299-2309 Fax: 81-043-299-2408 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.