National Manuals

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.

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.

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.

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.

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

The DAC081C081 is an 8-bit, single channel, voltage-output digital-to-analog converter (DAC) that operates from a +2.7V to 5.5V supply. It has a fast settling time and wide dynamic output range, making it suitable for low-power applications. The DAC081C085 is an alternative to the DAC081C081 with more address options and an external reference voltage feature.

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.

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.

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.

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.

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.

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

LP3943 is an integrated device capable of independently driving 16 LEDs. This device also contains an internal precision oscillator that provides all the necessary timing required for driving each LED. Two prescaler registers along with two PWM registers provide a versatile duty cycle control. The LP3943 contains the ability to dim LEDs in SMBUS/I2C applications where it is required to cut down on bus traffic. Traditionally, to dim LEDs using a serial shift register such as 74LS594/5 would require a large amount of traffic to be on the serial bus. LP3943 instead requires only the setup of the frequency and duty cycle for each output pin. From then on, only a single command from the host is required to turn each individual open drain output ON, OFF, or to cycle a programmed frequency and duty cycle. Maximum output sink current is 25 mA per pin and 200 mA per package. Any ports not used for controlling the LEDs can be used for general purpose input/output expansion.

The TP3094 is a monolithic PCM Codec and Filter device implemented using a digital signal processing architecture. It provides four voice channels, combining transmit bandpass and receive low pass channel filters with companding A-law or m-law PCM encoders and decoders. The device is fabricated using National’s advanced CMOS process. The device includes anti-aliasing filters and sigma-delta converters dedicated to each channel, and by a common signal processing unit which performs all the remaining filtering and processing for the four channels. The TP3094 includes a flexible PCM digital interface, which allows the device to be connected to PCM busses of different formats. It can also be connected with other TP3094 devices in a cascade fashion, for a system with up to 128 POTS interfaces (when a 2.048MHz PCM bus is used).

The LM3500 is a fixed-frequency step-up DC/DC converter that is ideal for driving white LEDs for display backlighting and other lighting functions. This device features fully integrated synchronous switching (no external Schottky diode required) and a low feedback voltage (500mV), making it highly efficient for lighting applications in wireless phones and other portable products (single cell Li-Ion or 3-cell NiMH battery supplies). The LM3500 operates with a fixed 1MHz switching frequency. When used with ceramic input and output capacitors, the LM3500 provides a small, low-noise, low-cost solution. Two LM3500 options are available with different output voltage capabilities. The LM3500-21 has a maximum output voltage of 21V and is typically suited for driving 4 or 5 white LEDs in series. The LM3500-16 has a maximum output voltage of 16V and is typically suited for driving 3 or 4 white LEDs in series (maximum number of series LEDs dependent on LED forward voltage). If the primary white LED network should be disconnected, the LM3500 uses internal protection circuitry on the output to prevent a destructive over-voltage event. A single external resistor is used to set the maximum LED current in LED-drive applications. The LED current can easily be adjusted using a pulse width modulated (PWM) signal on the shutdown pin. In shutdown, the LM3500 completely disconnects the LED power supply to prevent LED damage.