Low-Power, High-Speed Comparators Consume Only 900 mA
The MAX9010 high-speed, low-power comparators achieve a 5-ns propagation delay. Operating from a 900-mA supply current, these devices have precision ground-sensing differential inputs. They also feature TTL-compatible outputs. The devices operate from a single 4.5- to 5.5-V supply. A unique design technique ensures that the outputs remain stable through the linear region. The outputs remain stable even when driven with slow-moving input signals. This feature eliminates the output instability common to other high-speed comparators.
The MAX9010 comparators are offered in the ultra-small 6-pin SC70 package. In quantities of 100,000 or greater, pricing begins at $0.80.
Maxim Integrated Products, 120 San Gabriel Dr., Sunnyvale, CA 94086; (408) 737-7600; www.maxim-ic.com.
DAC Supports DSD Audio Data Format
The WM8728 digital-to-analog converter (DAC) supports the Direct Stream Digital (DSD) audio data format. Based on a 6-bit architecture, this device is 64 times less sensitive to clock jitter than a 1-bit DAC. The 24-bit DAC integrates a DSP interface as well as the common industry audio formats. Users can connect multiple DACs to a single time-multiplexed DSP interface, reducing the control overhead and pin count for the interface.
The WM8728 provides a hardware and software interface for audio control. Data input word lengths in PCM format range from 16 to 24 bits with sampling rates up to 192 kHz. In Super Audio CD (SACD) mode, the device provides two channels of 1-bit DSD with a sampling rate of 2.8224 MHz. The WM8728 is available in a 22-pin SSOP for $2.14 each in 1000-unit quantities.
Wolfson Microelectronics Ltd., Lutton Ct., Bernard Terrace, Edinburgh EH8 9NX, U.K.; +44 (0) 131 667 9386; fax +44 (0) 131 667 5176; www.wolfsonmicro.com.
DAC Cards Provide Two, Four, Or Six Analog Output
s The PCI-DA12 series of digital-to-analog converter (DAC) cards functions for PCI Bus computers. The half-size converter cards are available with two (PCI-DA12-2), four (PCI-DA12-4), or six (PCI-DA12-6) double-buffered analog outputs with 12-bit resolution. Output voltages include standard 0- to 2.5-V, 0- to 5-V, and 0- to 10-V ranges. The devices offer ±2.5 V, ±5 V, and ±10 V bipolar outputs. A 4-to-20-mA current loop output also may be selected. To prevent spurious outputs at power-up, DAC outputs are set to less than 15% of span by automatically restricting the reference voltage and setting the card to simultaneous update mode.
Measuring only 6 in., the cards can be installed in the 5-V PCI slot of any IBM-compatible computer. The two, four, and six analog output versions cost $359, $449, and $529, respectively.
ACCES I/O Products Inc., 10623 Roselle St., San Diego, CA 92121; (858) 550-9559; fax (858) 550-7322; www.acces-usa.com.
Unity Gain Stable Op Amp Features Programmable Supply Current
The LT1815 unity gain stable voltage feedback op amp is designed for use in high-speed applications. This device has a low noise of 6 nV/Hz1/2. It has a wide input-voltage range that typically extends to 800 mV from the rails. The output voltage swing reaches to within 900 mV of the supply to support operation on supplies as low as 4 V ±2 V. While the offset voltage is just 1.5 mV maximum, the drift is guaranteed to be less than 15 µV/°C.
At maximum speed, the LT1815 draws a supply current of just 7 mA maximum. The SOT-23 6-lead version features an adjustable supply current and shutdown. The LT1815 is available specified for use over the temperature ranges of 0°C to 70°C or −40°C to 85°C. SO-8, SOT-23 5-lead, and SOT-23 6-lead packages are available. In 1000-piece quantities, pricing begins at $1.75 each.
Linear Technology Corp., 720 Sycamore Dr., Milpitas, CA 95035-7417; (408) 432-1900; fax (408) 434-6441; www.linear-tech.com.