National Manuals (Industrial)

The LM80 is an I2C interface that monitors microprocessor system hardware. It can measure temperature, voltage, fan speed, etc., and has watchdog comparison functions, which can monitor and reset external circuits. It is suitable for both linear and digital temperature sensors, and it has a 2.8V to 5.75V power supply voltage range, low power supply current and I2C interface, so it can be widely used in personal computers, electronic test equipment and office electronic devices.

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The LMV225/LMV226/LMV228 are 30dB RF power detectors intended for use in CDMA and WCDMA applications. The device has an RF frequency range from 450 MHz to 2 GHz. It provides an accurate temperature and supply compensated output voltage that relates linearly to the RF input power in dBm. The circuit operates with a single supply from 2.7V to 5.5V. The LMV225/LMV226/LMV228 have an integrated filter for low-ripple average power detection of CDMA signals with 30 dB dynamic range. Additional filtering can be applied using a single external capacitor. The LMV225 has an RF power detection range from –30 dBm to 0 dBm and is ideally suited for direct use in combination with resistive taps. The LMV226/LMV228 have a detection range from –15 dBm to 15 dBm and are intended for use in combination with a directional coupler. The LMV226 is equipped with a buffered output which makes it suitable for GSM, EDGE, GPRS and TDMA applications. The device is active for Enable = HI, otherwise it is in a low power consumption shutdown mode. During shutdown, the output will be LOW. The output voltage ranges from 0.2V to 2V and can be scaled down to meet ADC input range requirements. The LMV225/LMV226/LMV228 power detectors are offered in the small 1.0 mm x 1.0 mm X 0.6 mm micro SMD package.

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LP3985 is a micropower, 150mA low-noise ultra low-dropout CMOS voltage regulator designed for portable and wireless applications with demanding performance and space requirements. It delivers ultra low noise, extremely low dropout voltage, and low quiescent current optimized for battery powered systems. It has good power supply rejection and is suitable for low input voltage levels common to battery operated circuits. It is an ideal choice for mobile phone and similar battery powered wireless applications.

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The LM3500 is a synchronous step-up DC/DC converter designed specifically for white LED applications in cellular phone backlighting requiring low current and high efficiency.

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The DAC0808 is a 8-bit D/A converter produced by National Semiconductor Corporation, with a relative accuracy of ±0.19%, full scale current matching of ±1 LSB, a fast settling time of 150 ns, and non-inverting digital inputs compatible with TTL and CMOS.

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The ADC081C021/ADC081C027 is an I2C-compatible, 8-bit analog-to-digital converter (ADC) with Alert Function. It features low power consumption, single supply, high accuracy, high resolution, high speed, and small package.

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LM3702/LM3703 microprocessor supervisory circuits with low line output and manual reset

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The DAC121C081/ DAC121C085 is a 12-bit micro power digital-to-analog converter (DAC) with an I2C-compatible interface. It provides a wide dynamic output range and fast settling time. The DAC121C081 uses the supply voltage as the reference and has low power consumption. The DAC121C085 provides more address options and uses an external reference voltage. Both have a 2-wire I2C-compatible serial interface and power management features.

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The LM83 Digital Temperature Sensor is a two-wire serial interface product that uses a Delta-Sigma analog-to-digital converter with a digital over-temperature detector to sense the voltage and thus the temperature of three remote diodes.

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The LM2931 series low dropout regulators are adjustable output regulators with ON/OFF pin. It has very low quiescent current and extremely low input-output differential, which makes it ideal for standby power systems. Applications include memory standby circuits, CMOS and other low power micro processor power supplies as well as systems demanding as much as 100mA of output current. The series includes a fixed 5V output (±3.8% tolerance, A grade) or an adjustable output, which is available in a TO-220 power package, TO-263 surface mount package and an 8-lead surface mount package.

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LP3944 RGB/White/Blue 8-LED Fun Light Driver is an LED driver chip launched by Infineon. It integrates 8-channel LED driver circuits and an internal precision oscillator, which can independently drive 8 LEDs and support PWM dimming.

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The LMK02000 precision clock conditioner combines the functions of jitter cleaning/reconditioning, multiplication, and distribution of a reference clock. It features 20 fs additive jitter, an integrated Integer-N PLL, a clock output frequency range of 1 to 800 MHz, 3 LVDS and 5 LVPECL clock outputs, dedicated divider and delay blocks, and a pin compatible family of clocking devices.

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LMV225/LMV226/LMV228 RF power detectors for CDMA and WCDMA provide 30 dB linear in dB power output voltage.

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LMC555 is a CMOS version of the industry standard 555 series general purpose timers. It offers the same capability of generating accurate time delays and frequencies as the LM555 but with much lower power dissipation and supply current spikes. The time delay is controlled by a single external resistor and capacitor, and the oscillation frequency and duty cycle are accurately set by two external resistors and one capacitor. The LMCMOS™ process extends both the frequency range and low supply capability.

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The LM78LXX series is a three-terminal positive regulator with several fixed output voltages, making them suitable for a wide range of applications. When used as a zener diode/resistor combination replacement, the LM78LXX usually results in a significant improvement in effective output impedance and lower quiescent current. These regulators can provide on-card regulation, eliminating the distribution problems associated with single point regulation. The available voltages allow the LM78LXX to be used in logic systems, instrumentation, HiFi, and other solid-state electronic equipment. The LM78LXX is available in plastic TO-92 (Z) package, plastic SO-8 (M) package, and a chip-sized package (8-Bump micro SMD) using National's micro SMD package technology. With sufficient heat sinking, the regulator can deliver an output current of 100mA. Current limiting is included to limit the peak output current to a safe value. Safe area protection is provided for the output transistors to limit internal power dissipation. If the internal power dissipation exceeds the heat sinking capability, the thermal shutdown circuit prevents the IC from overheating.

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The LM48860 is a ground referenced, fixed-gain audio power amplifier capable of delivering 40mW per channel of continuous average power into a 16Ω single-ended load with less than 1% THD+N from a 3V power supply. It features a new circuit technology that utilizes a charge pump to generate a negative reference voltage, eliminating the need for output-coupling capacitors typically used with normal single-ended loads. The amplifier is suitable for mobile phone and low voltage applications with minimal power consumption. It also includes a low-power consumption shutdown mode, internal thermal shutdown protection mechanism, and advanced pop & click circuitry for noise elimination during turn-on and turn-off transitions.

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LM75 is a chip that integrates temperature sensor, Delta-Sigma analog-to-digital converter and digital over-temperature detector, and is equipped with I2C interface. The host can query the LM75 at any time to read temperature. When the temperature exceeds a programmable limit, the open-drain over-temperature shut-down (O.S.) output becomes active. This pin can operate in either “Comparator” or “Interrupt” mode. The host can program both the temperature alarm threshold (TOS) and the temperature at which the alarm condition goes away (THYST). In addition, the host can read back the con- tents of the LM75’s TOS and THYST registers. Three pins (A0, A1, A2) are available for address selection. The sensor powers up in Comparator mode with default thresholds of 80˚C TOS and 75˚C THYST. The LM75’s 3.0V to 5.5V supply voltage range, low supply current and I2C interface make it ideal for a wide range of applications. These include thermal management and pro- tection applications in personal computers, electronic test equipment, and office electronics.

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ADC0801/ADC0802/ADC0803/ADC0804/ADC0805 8-Bit µP Compatible A/D Converters

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The LM2756 is a highly integrated, switched-capacitor, multi-display LED driver that can drive up to 8 LEDs in parallel with a total output current of 180mA. Regulated internal current sources deliver excellent current and brightness matching in all LEDs. The LED driver current sinks are split into three independently controlled groups. The primary group (Group A) can be configured to drive four, five or six LEDs for use in the main phone display, while the secondary group (Group B) can be configured to drive one, two or three LEDs for driving secondary displays, keypads and/or indicator LEDs. An additional driver, D1C, is provided for additional indicator lighting functions. The device provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2 or in Pass-Mode. The proper gain for maintaining current regulation is chosen, based on LED forward voltage, so that efficiency is maximized over the input voltage range. The LM2756 is available in National’s tiny 20-bump, 0.4mm pitch, thin micro SMD package.

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DS90CR483A / DS90CR484A is a 48-bit LVDS channel link SER/DES chip that supports a working frequency of 33-112MHz. It can convert 48 bits of CMOS/TTL data into 8 LVDS data streams and transmit a phase-locked transmit clock over the ninth LVDS link. The use of this chipset can significantly reduce the number of cables, reduce system costs, and reduce the physical size and cost of connectors.

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