National Manuals

The LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing a linear analog display. It has an adjustable reference voltage and an accurate 10-step voltage divider. The circuit can drive LEDs of many colors or low-current incandescent lamps. Multiple LM3914s can be chained to form displays of 20 to over 100 segments. The LM3914 is very easy to apply as an analog meter circuit.

The LM3407 is a 350mA constant current output floating buck switching converter from Texas Instruments, designed to provide constant current to high power LEDs. It has an integrated power N-MOSFET that makes the application solution compact and easy to implement. An external 1% thick-film resistor allows the converter output voltage to adjust as needed to deliver constant current within 10% accuracy to a serially connected LED string of varying number and type. Converter switching frequency is adjustable from 300 kHz to 1 MHz. The LM3407 features a dimming input to enable LED brightness control by Pulse Width Modulation (PWM). Additionally, a separate enable pin allows for low power shutdown. An eMSOP-8 package provides excellent heat dissipation and thermal performance. Input UVLO and output open-circuit protection ensure a robust LED driver solution.

LMP2015/LMP2016 are the first members of National's new LMPTM precision amplifier family. They offer unprecedented accuracy and stability in space-saving miniature packaging at an affordable price. These devices utilize patented techniques to measure and continually correct the input offset error voltage. The result is a series of amplifiers that are ultra stable over time and temperature. They have excellent CMRR and PSRR ratings and do not exhibit the familiar 1/f voltage and current noise increase that plagues traditional amplifiers. The combination of characteristics makes the LMP2015/LMP2016 good choices for transducer amplifiers, high gain configurations, ADC buffer amplifiers, DAC I-V conversion, or any other 2.7V-5V application requiring precision and long-term stability. Other useful benefits of the LMP2015/LMP2016 are rail-to-rail output, a low supply current of 930 µA, and a wide gain bandwidth product of 3 MHz. These extremely versatile features provide high performance and ease of use.

The LM5007 is a high-voltage step-down switching regulator from Linear Technology. It integrates an 80V, 0.7A N-channel buck switch, has a simple external circuit, the working frequency can be automatically adjusted according to the input voltage and load, and the output voltage is adjustable. It has thermal shutdown, undervoltage lockout, overcurrent protection, overload protection and other functions.

The LM48411 is a single supply, high efficiency, 2.5W/channel Class D audio amplifier from National Semiconductor. It features the company's unique patented ultra low EMI, spread spectrum, PWM architecture, which significantly reduces RF emissions while preserving audio quality and efficiency. The E2S system also improves battery life, reduces external component count, board area consumption, system cost and simplifies design. The LM48411 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is capable of delivering 2.5W/channel of continuous output power to a 4Ω load with less than 10% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V. The wide band spread spectrum architecture of the LM48411 reduces EMI-radiated emissions due to the modulator frequency. The LM48411 features high efficiency compared to a conventional Class AB amplifier. The E2S system includes an advanced, patented pending edge rate control (ERC) architecture that further reduce emissions by minimizing the high frequency component of the device output, while maintaining high quality audio reproduction and high efficiency (η = 87% at VDD = 3.6V, PO = 500mW). Four gain options are pin se- lectable through GAIN0 and GAIN1 pins.

The LM2755 is a charge-pump-based, constant current LED driver capable of driving 3 LEDs with a total output current up to 90mA. The diode current waveforms of each LED can be trapezoidal with timing and level parameters (rise time, fall time, high level, low level, delay, high time, low time) programmed via an I2C compatible interface. The 32 brightness levels found on the LM2755 are exponentially spaced (as opposed to linearly spaced) to better match the response of the human eye to changing brightness levels. The device requires only four small and low-cost ceramic capacitors. The LM2755 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2 or in a gain of 1. Maximum efficiency is achieved over the input voltage range by actively selecting the proper gain based on the LED forward voltage requirements. The pre-regulation scheme used by the LM2755 is optimized to ensure low conducted noise on the input. An internal soft-start circuitry eliminates high inrush current at start-up. The LM2755 consumes 3µA (typ.) of supply current in shut-down. The LM2755 is available in National’s tiny 18-bump thin micro SMD package.

DS55493�DS75493 is a quad LED segment driver, its characteristics are low voltage operation, low input current, low standby power, display blanking function, output current regulation, quad high gain circuits

The LMH1980 is an auto-detecting SD/HD/PC video sync separator ideal for use in a wide range of video applications, such as automotive LCD monitors, video capture & editing devices, surveillance & security equipment, and machine vision and inspection systems. It automatically detects the video format, eliminating the need for external RSET resistor adjustment required by other sync separators. The outputs provide timing signals in CMOS logic, including Composite, Horizontal, and Vertical Syncs, Burst/Back Porch Timing, and Odd/Even Field outputs. The HD flag output provides a logic low signal only when a valid HD video input with tri-level sync is detected. It can be used to disable an external switch-controlled SD chroma filter when HD video is detected, or enable it when SD video is detected. For non-standard video with bi-level sync and without vertical serration pulses, a default vertical sync pulse will be output and no horizontal sync pulses will be output during the vertical sync interval. The LMH1980 is available in a space-saving 10-ld. Mini-SO Package (MSOP) and operates over a temperature range of −40°C to +85°C.

LM2716 is a dual-path DC/DC converter from National Semiconductor. It consists of a fixed output voltage buck converter and an adjustable output voltage boost converter. Both use low RDSON (0.16 Ω and 0.12 Ω) internal switches for maximum efficiency. The operating frequency can be adjusted anywhere between 300 kHz and 600 kHz, allowing the use of small external components. External soft-start pins for each allow the user to tailor the soft-start times to a specific application. Each converter may also be shut down independently with its own shutdown pin. The LM2716 is available in a low profile 24-lead TSSOP package.

LM97593 is a digital downconverter with integrated 12-bit analog-to-digital converters (ADCs) and automatic gain control (AGC)

The LM22677 is a simple switch regulator that can provide 5A output with adjustable switching frequency and wide input voltage range, high efficiency and low on-resistance.

LP38691/LP38693 500mA Low Dropout CMOS Linear Regulators Stable with Ceramic Output Capacitors

The DP84240 and DP84244 are octal TRI-STATE drivers designed for heavy capacitive load applications such as fast data buffers or as memory address drivers. The DP84240 is an inverting driver which is pin-compatible with both the 74S240 and AM2965. The DP84244 is a non-inverting driver which is pin-compatible with the 74S244 and AM2966. These parts are fabricated using an oxide isolation process for much faster speeds and are specified for 250 pF and 500 pF load capacitances. TRI-STATE is a registered trademark of National Semiconductor Corp.

The LM3915 is an integrated circuit that can sense analog voltage levels and drive ten LEDs, LCDs or vacuum fluorescent displays, providing a logarithmic 3 dB/step analog display.

The LM6181 is a 100 MHz current feedback amplifier with a slew rate of 2000V/µs. It is ideal for data acquisition, high speed ATE, and precision pulse amplifier applications.