Mixed-Signal CMOS Silicon-Gate IC Interfaces With PIR Sensors
The LS6511 mixed-signal CMOS silicon-gate IC interfaces with PIR sensors. Its two-stage differential amplifier directly interfaces with the PIR sensor's outputs. An external RC network controls gain and bandwidth. A window comparator and digital filter process the amplifier outputs to eliminate noise and validate motion.
The device also includes mode select for single-pulse, dual-pulse, and concurrent-pulse detection. An output duration timer, a 5-V shunt regulator, and undervoltage detection are featured as well. Two complementary outputs support direct drive of a relay coil and LED.
The 14-pin DIP version of the LS6511 costs $0.85 in 10,000-unit quantities. The 14-pin SOIC version costs slightly more.
LSI Computer Systems Inc., 1235 Walt Whitman Rd., Melville, NY 11747-3086; (631) 271-0400; fax (631) 271-0405; www.lsicsi.com.
Temperature-To-Voltage Converter Measures From −40°C To 125°C
The NCT47 temperature-to-voltage converter is designed for thermal management applications. It measures temperature from −40°C to 125°C with a guaranteed temperature converter linearity accuracy of ±2°C at 25°C. Operating from a single supply, it has a 10-mV/°C positive temperature slope. Its typical output voltage range is 100 mV at −40°C, 500 mV at 0°C, 750 mV at 25°C, and 1.75 V at 125°C. Housed in a three-pin SOT-23B package, it's suited for space-constrained designs.
In 12,000-piece quantities, suggested pricing starts at $0.59 each. Sample and production quantities are available now.
ON Semiconductor, 5005 E. McDowell Rd., Phoenix, AZ 85008; www.onsemi.com.
Fast Transient Response 1.5-A LDO Features Low Output Noise
The LT1963 is a low-noise, low dropout (LDO) linear regulator. It was developed to satisfy the increasing need to regulate voltage supplies of 2.5 V and lower from a 3.3-V input. Featuring fast transient response, this device can deliver as high as 1.5 A with only a 240-mV dropout. Additionally, it generates only 40 µV rms of output noise over a 10-Hz to 100-kHz bandwidth.
Another advantage of the LT1963 is that it is stable with all kinds of capacitors. In shutdown mode, it can reduce supply current from 1 mA to under 1 µA. Also, this model can function from a 2.3- to 20-V input supply, making it compatible with a number of input power sources.
Output voltages are fixed at 1.8, 2.5, and 3.3 V, or they can be regulated between 1.21 and 20 V. Internal reverse battery protection shields against reverse current flow without requiring external protection diodes. Plus, the output can be pulled below ground without damaging the device. Other protection circuitry includes current limiting and thermal limiting.
Available from stock, the LT1963 comes in 8-lead SO, SOT-223, 5-lead T0220, and DD packaging. Pricing starts at $2.15 each in 1000-piece quantities.
Linear Technology Corp., 1630 McCarthy Blvd., Milipitas, CA 95035; (408) 432-1900; fax (408) 434-6441; www.linear-tech.com.
Transmit And Receive IF Amplifiers Available In Chip-Scale Packages
The AD6121 receive IF amplifier/demodulator operates from 50 to 350 MHz. Its IF amplifier has 90 dB of "linear-in-dB" gain control. Also, it's compatible with IS-95 and other wideband RF system requirements. Meanwhile, the AD6122 transmit IF amplifier/modulator has 90 dB of "linear-in-dB" gain control for 50- to 350-MHz IF frequencies as well.
Both devices operate from 3-V nominal power supplies. They include built-in low-dropout voltage regulators while consuming half the power of similar devices. The AD6121 has a quadrature demodulator. Similarly, the AD6122 has a quadrature modulator.
Housed in LPCC-32 packages, these IF amplifiers cost $4.00 in 10,000-unit quantities.
Analog Devices, 3 Technology Way, P.O. Box 9106, Norwood, MA 02062-9106; (781) 329-4700; fax (781) 329-1241; www.analog.com.