Summit Micro Expands DAC Offering.CAMPBELL, Calif.--(BUSINESS WIRE)--Aug. 17, 1998--Summit Microelectronics has expanded its family of non-volatile, digital-to-analog converters (DACs) with the addition of two devices, both of which have four independent 8-bit DACs.
Each of the four DACs has a standard 8-bit data register to hold the binary value of the output voltage. In parallel with the 8-bit data register is an 8-bit EEPROM (Electrically Erasable Programmable ROM) A rewritable memory chip that holds its content without power. Although EEPROMs spawned flash memory, EEPROMs are byte addressable at the write level, whereas flash chips must erase a block of bytes before rewriting. register that can load its contents into the data register or itself be loaded with the contents of the data register. Each DAC See D/A converter and discretionary access control.
DAC - Digital to Analog Converter also contains a resistor resistor, two-terminal electric circuit component that offers opposition to an electric current. Resistors are normally designed and operated so that, with varying levels of current, variations of their resistance values are negligible (see resistance). network, and its outputs are buffered by a unity gain amplifier.
The S9408 and S9418 employs a serial interface that is compatible with the Serial Peripheral Interface (communications, hardware) Serial Peripheral Interface - (SPI) A serial interface in which a master device supplies clock pulses to exchanges data serially with a slave over two data wires (Master-Slave and Slave-Master). (SPI (1) (Stateful Packet Inspection) See stateful inspection.
(2) (Service Provider Interface) The programming interface for developing Windows drivers under WOSA. ) for both read and write functions. Both devices offer differential non-linearity of +/-0.5 LSB (Linux Standard Base) A standard interface (ABI) for Linux from the Linux Foundation (www.linux-foundation.org). Introduced in 2001 by the Free Standards Group, which later became the Linux Foundation, applications based on the LSB standard will run properly under and integral non-linearity of +/-1 LSB, and both are specified for operation from a single 2.7V to 5.5V supply. Each of the S9408's and S9418's four DACs can be programmed independently, and each has its own electrically isolated voltage reference A voltage reference is an electronic device (circuit or component) that produces a fixed (constant) voltage irrespective of the loading on the device, power supply variation and temperature. input.
"These devices are unique in the semiconductor industry," explained Richard Palm, Summit's vice president of Marketing. "All other DACs currently available require an external EEPROM for programming. Because the S9408 and S9418 incorporate non-volatile memory Refers to memory chips that hold their content without power being applied. It may refer to chips that are not changeable, such as ROMs and PROMs, or to chips that can be rewritten many times such as flash memory. on the chip they can eliminate the cost, power consumption and board space required by an external EEPROM. Additionally, the unique design of the devices enable system diagnostics down to the chip level," he added.
This is the second major family of digital-to-analog controllers introduced by Summit. Previously, the company brought to market its S9317 and S9318 DACs that were designed specifically to be high-resolution, price-equivalent replacements for both mechanical and electronic potentiometers.
The output states of the new S9408 DAC, which the user can save in EEPROM memory, may be recalled and loaded into the four DACs at power-up. Alternatively, the S9408 can load '00' at power-up. These power-up options are controlled by the 00/REG\ input. At power-up on the S9418, data is recalled from EEPROM and loaded into the four DACs.
However, the user can force the output to '00' using an analog MUTE function. Unlike the 00/REG\ input, the MUTE function can be invoked at any time. On both the S9408 and S9418, the DAC's output values may be changed at any time after power-up without affecting the data in EEPROM.
The S9408 and S9418 are each available in the 20-pin SOIC (Small Outline IC) A small-dimension, plastic, rectangular, surface mount chip package that uses gull-wing pins extending outward. See gull-wing lead, SOJ and chip package. package priced at $2.80 in 1,000-piece quantities.
Summit Microelectronics, Inc. focuses on the integration of analog and EEPROM technologies to provide cost-effective solutions to a variety of applications in the telecommunications, consumer and automotive markets. Its website is www.summitmicro.com.
CONTACT: Summit Microelectronics, Inc. Rick Orlando/Rich Palm, 408/378-6461