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部品型式

AD7769AR

製品説明
仕様・特性

a LC2MOS Analog I/O Port AD7769* FEATURES Two-Channel, 8-Bit 2.5 ␮s ADC Two 8-Bit, 2.5 ␮s DACs with Output Amplifiers Span and Offset of ADC and DAC Independently Adjustable Low Power FUNCTIONAL BLOCK DIAGRAM APPLICATIONS Winchester Disk Servo Controllers Floppy Disk Microstepping Closed Loop Servo Systems OBS GENERAL DESCRIPTION OLE The AD7769 is a complete, two-channel, 8-bit, analog I/O port. It has versatile input and output signal conditioning features that make it ideal for use in head-positioning servos in Winchester disk systems. It is equally suitable for floppy disk microstepping head positioning, other closed loop digital servo systems and general purpose 8-bit data acquisition. The AD7769 contains a high speed successive approximation ADC, preceded by a two-channel multiplexer and signal conditioning circuits. The input span of the ADC and the offset of the zero point from ground can be independently set by applying ground referenced voltages. The AD7769 also contains two independent, fast settling, 8-bit DACs with output amplifiers. The output span and offset voltage of the DACs can be set independently of those of the ADC. This makes the AD7769 especially useful in disk drives, where only a positive supply rail is available and the ranges of the ADC and DACs must be referenced to some positive voltage less than the supply. The AD7769 is easily interfaced to a standard 8-bit mpu bus via an 8-bit data port and standard microprocessor control lines. The AD7769 is fabricated in Linear Compatible CMOS (LC2MOS), an advanced, mixed technology process that combines precision bipolar circuits with low power CMOS logic. The part is available in a 28-pin plastic DIP and 28-terminal PLCC package. TE PRODUCT HIGHLIGHTS 1. Two-Channel, 8-Bit Analog I/O port on a Single Chip. The AD7769 contains a two-channel, high speed ADC with input signal conditioning and two, fast settling 8-bit DACs with output amplifiers, on a single chip. 2. Independent Control of Span and Offset. The input voltage span of the ADC and the midpoint of the transfer function, the output voltage swing of the two DACs and the half-scale output voltage, can be set independently by applying ground referenced control voltages. 3. Dynamic Specifications for DSP Users. In addition to the traditional ADC and DAC specifications, the AD7769 is specified with ac parameters including signalto-noise ratio, distortion and signal bandwidth. 4. Fast Microprocessor Interface. The AD7669 has bus interface timing compatible with all modern microprocessors, with bus access and relinquish times less than 65 ns and a Write pulse width less than 90 ns. *Covered by U.S. Patent No. 4,990,916. REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703

ブランド

AD

会社名

Analog Devices

本社国名

U.S.A

事業概要

半導体デバイスを製造するアメリカの多国籍企業。特にADC、DAC、MEMS、DSPなどに強い。現在は 65nm から 3μm のプロセスルールの回路を設計している。

供給状況

 
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