National Semiconductor Manuals

This document introduces the characteristics of ADC14L040 14-Bit, 40 MSPS, 235 mW A/D Converter, including single +3.3V supply, 14-bit resolution, 40 MSPS sampling rate, 150 MHz bandwidth, etc.

The LM5116 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply

LM136-2.5/LM236-2.5/LM336-2.5V Precision 2.5V Zener Diodes

The CLC5957 is a monolithic 12-bit, 70 MSPS analog-to-digital converter. It is optimized for use in IF-sampled digital receivers and other applications that require high resolution, high sampling rate, wide dynamic range, low power dissipation, and compact size. The CLC5957 features include differential analog inputs, low jitter differential universal clock inputs, a low distortion track-and-hold with 0-300MHz input bandwidth, a bandgap voltage reference, data valid clock output, TTL compatible CMOS (3.3V or 2.5V) programmable output logic, and a proprietary 12-bit multi-stage quantizer. It is fabricated on the ABIC-V 0.8 micron BiCMOS process. The CLC5957 has a spurious free dynamic range (SFDR) of 74dBc and a signal to noise ratio (SNR) of 67dB. The wideband track-and-hold allows sampling of IF signals up to 250MHz. It produces a two-tone, dithered, SFDR of 83dBFS at a 75MHz input frequency. The differential analog input provides excellent common mode rejection, while the differential universal clock inputs minimize jitter. The 48-pin TSSOP package is ideal for space-constrained applications. The CLC5957 operates from a single +5V power supply and is guaranteed to operate over the industrial temperature range of -40˚C to +85˚C. National Semiconductor tests each part to verify compliance with the guaranteed specifications.

The LMS1487 is a low power differential bus/line transceiver designed for high speed bidirectional data communication on multipoint bus transmission lines. It meets ANSI Standards TIA/EIA RS422-B, TIA/EIA RS485-A and ITU recommendation and V.11 and X.27. The LMS1487 combines a TRI-STATE™ differential line driver and differential input receiver, both of which operate from a single 5.0V power supply. The driver and receiver have an active high and active low, respectively, that can be externally connected to function as a direction control. The driver and receiver differential inputs are internally connected to form differential input/output (I/O) bus ports that are designed to offer minimum loading to bus whenever the driver is disabled or when VCC = 0V. These ports feature wide positive and negative common mode voltage ranges, making the device suitable for multipoint applications in noisy environments. The LMS1487 is available in a 8-Pin SOIC and 8-pin DIP packages. It is a drop-in socket replacement to Maxim’s MAX1487.

This document introduces the features and characteristics of LM3671 step-down DC-DC converter. LM3671 step-down DC-DC converter is designed for power supply low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. The chip provides up to 600mA load current, over the entire input voltage range. There are several different fixed voltage output options available as well as an adjustable output voltage version. The device offers superior features and performance for mobile phones and similar portable systems. Automatic in- telligent switching between PWM low-noise and PFM low- current mode offers improved system control. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typ). Hysteretic PFM mode extends the battery life by re- ducing the quiescent current to 16 µA (typ) during light load and standby operation. Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typ). The LM3671 is available in SOT23-5 and a tiny 5-bump micro SMD packages in leaded (PB) and lead-free (NO PB) versions. A high switching frequency of 2 MHz (typ) allows use of tiny surface-mount components. Only three external surface-mount components, an inductor and two ceramic capacitors, are required.

LM6511 180ns 3V Comparator is ideal for analog-digital interface circuitry when only a +3V or +3.3V supply is avail- able

LMH6714/6720/6722 is a high performance video op amp from National. It provides 400MHz bandwidth and 1800V/µs slew rate with only 5.6mA power consumption. This product series is ideal for broadcast quality video systems. Its small size, low power, low noise and distortion also make it suitable for portable RF applications.

CLC031A is a video deserializer/descrambler produced by Cirrus Logic, which supports SMPTE292M, 259M, and 344M standards

The LM2675 series of regulators are monolithic integrated circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V, 12V, and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation (Patent Nos. 5,382,918 and 5,514,947) and a fixed frequency oscillator. The LM2675 series operates at a switching frequency of 260 kHz, thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Because of its very high efficiency (>90%), the copper traces on the printed circuit board are the only heat sinking needed. A family of standard inductors for use with the LM2675 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the datasheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies. Other features include a guaranteed ±1.5% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency.

The LMC6772 is a dual bipolar micropower voltage follower with open drain output. The working voltage range is wide, the output voltage range is from the positive and negative supply rails, and it is suitable for single power supply systems. The device has the characteristics of low current consumption, short circuit protection, high response speed, and is suitable for laptop computers, mobile phones, metering systems, handheld electronic devices, RC timers, alarm monitoring circuits, window comparators, etc.

The LM2672 series is a monolithic integrated circuit that serves as a high-efficiency 1A step-down voltage regulator. It offers excellent line and load regulation, and is available in fixed output voltages of 3.3V, 5.0V, 12V, as well as an adjustable output version. The LM2672 includes various features such as internal frequency compensation, fixed frequency oscillator, external shutdown, soft-start, and frequency synchronization. Operating at a switching frequency of 260 kHz, it allows for smaller sized filter components compared to lower frequency regulators. With its high efficiency (>90%), the LM2672 only requires copper traces on the PCB for heat sinking. The LM2672 is compatible with a range of standard inductors, diodes, and capacitors for simplified switch-mode power supply designs.