AD2S90:  低成本、完整的12位旋变数字转换器

AD2S90 功能框图AD2S90是一款完整的12位分辨率旋变数字转换器,无需外部元件便可工作。转换器的SIN、COS和REF输入端允许输入2 V rms ± 10%、频率为3 kHz至20 kHz范围内的信号。Type II伺服环路用于跟踪输入信号,并将SIN和COS输入端的信息转换为输入角度所对应的数字量。转换器的带宽内部设置为1 kHz。12位分辨率时最大跟踪速率为375 rps。角位置输出信息以两种形式提供:绝对串行二进制和增量式A quad B。绝对串行二进制输出为12位(1/4096)。当片选CS为逻辑高电平时,数据输出引脚为高阻态,从而允许将多个转换器连接到同一条总线。串行纯二进制形式的绝对角度信息先由CS访问,然后施加一个最大速率为2 MHz的外部时钟(SCLK)。编码器仿真输出A、B和NM连续产生相当于一个1024线编码器的信号。解码时,这相当于12位分辨率。三个共用路标脉冲宽度通过单引脚(NMC)进行选择。模拟速度输出信号提供顺时针或逆时针转动旋变轴的速度表示。AD2S90在±5 V ± 5%直流电源下工作,采用ADI公司线性兼容CMOS工艺(LC2MOS)制造。LC2MOS是一种将精密双极性电路与低功耗CMOS逻辑电路相结合的混合技术工艺。

The AD2S90 is a complete 12-bit resolution tracking resolver-to- digital converter. No external components are required to operate the device.The converter accepts 2 V rms ± 10% input signals in the range 3 kHz-20 kHz on the SIN, COS and REF inputs. A Type II servo loop is employed to track the inputs and convert the input SIN and COS information into a digital representation of the input angle. The bandwidth of the converter is set internally at 1 kHz. The maximum tracking rate is 375 rps at 12-bit resolution.Angular position output information is available in two forms, absolute serial binary and incremental A quad B.The absolute serial binary output is 12-bit (1 in 4096). The data output pin is high impedance when Chip Select CS is logic HI. This allows the connection of multiple converters onto a common bus. Absolute angular information in serial pure binary form is accessed by CS followed by the application of an external clock (SCLK) with a maximum rate of 2 MHz.The encoder emulation outputs A, B and NM continuously produce signals equivalent to a 1024 line encoder.When decoded this corresponds to 12-bits resolution. Three common north marker pulse widths are selected via a single pin (NMC).An analog velocity output signal provides a representation of velocity from a rotating resolver shaft traveling in either a clockwise or counterclockwise direction.The AD2S90 operates on a ±5 V dc ± 5% power supplies and is fabricated on Analog Devices' Linear Compatible CMOS process (LC2MOS). LC2MOS is a mixed technology process that combines precision bipolar circuits with low power CMOS logic circuits.

特点
  • 完整的单芯片旋变数字转换器
  • 增量式编码器仿真(1024线)
  • 绝对串行数据(12位)
  • 差分输入
  • 12位分辨率
  • 工业温度范围
  • 20引脚PLCC封装
  • 低功耗:50 mW
技术指标
  • Vel Lnrty (+/- FSR max): n/a
  • Interface: Serial
  • Encoder Emulation: Yes
  • Power (mW): 50mW
  • Package: 20PLCC
  • Resolution (Bits): 12bit
  • Max Track Rate (+/- rps): 500
  • Accuracy (arcmin): 10.6
  • Ref Freq (Hz): 3k-20k
  • Vel o/p: Yes
订购指南
产品型号 封装 引脚 温度范围 包装和数量 报价*(100-499) 报价*1000 pcs
AD2S90AP 产品状态: 量产 20 ld PLCC 20 工业 Tube, 49 $ 37.42 $ 32.09
AD2S90APZ 产品状态: 量产 20 ld PLCC 20 工业 Tube, 49 $ 34.08 $ 29.22

数据手册DataSheet 下载 版本 大小
AD2S90: 数据手册DataSheet 下载. pdf
Rev D, 01/1999 168 kB

应用笔记 版本 大小
AN-264: Dynamic Characteristics of Tracking Converter. pdf Rev. 0 205 kB
AN-263: Resolver to Digital Conversion; Simple Alternative to Optical Shaft Encoders. pdf Rev. 0 520 kB
AN-234: Digital Resolver Integration. pdf Rev. 0 133 kB
AN-230: 0: Circuit Applications of the AD2S90 R/D Converter. pdf
Rev. 0 240 kB

技术文章 版本 大小
DSP Motor Control in Domestic Appliance Applications. pdf Rev. 0 161 kB
Single Chip DSP Motor Control Systems Catching on in Home Appliances. pdf
Rev. 0 18 kB