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| AD5676低功耗8通道16位DAC解決方案 |
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| 文章來源： 更新時間：2015/5/15 9:28:00 |
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ADI公司的AD5676R是低功耗8通道16位緩沖電壓輸出數模轉換器(DAC),內置2.5V 2 ppm/˚C內部基準電壓源和上電復位電路,采用多功能串行外設接口(SPI)，時鐘速率最高達50 MHz, 工作溫度−40℃ 到+125℃,工作電壓2.7 V到5.5 V,主要用在光收發(fā)器,基站功率放大器,過程控制（可編程邏輯控制[PLC]I/O卡）,工業(yè)自動化和數據采集系統(tǒng).本文介紹了AD5672R/AD5676R主要特性,功能框圖,菊花鏈接圖以及AD5676R評估板主要特性,框圖,電路圖和材料清單.
The AD5672R/AD5676R are low power, octal, 12-/16-bit buffered voltage output digital-to-analog converters (DACs). They include a 2.5 V, 2 ppm/℃ internal reference (enabled by default) and a gain select pin giving a full-scale output of 2.5 V (gain = 1) or 5 V (gain = 2). The devices operate from a single 2.7 V to 5.5 V supply and are guaranteed monotonic by design. The AD5672R/AD5676R are available in a 20-lead TSSOP package and incorporate a power-on reset circuit and a RSTSEL pin that ensures that the DAC outputs power up to zero scale or midscale and remain there until a valid write. The AD5672R/AD5676R contain a power-down mode, reducing the current consumption to 1 μA typical while in power-down mode.
AD5672R/AD5676R主要特性:
High performance
High relative accuracy (INL): ±3 LSB maximum at 16 bits
Total unadjusted error (TUE): ±0.14% of FSR maximum
Offset error: ±1.5 mV maximum
Gain error: ±0.06% of FSR maximum
Low drift 2.5 V reference: 2 ppm/℃ typical
Wide operating ranges
−40℃ to +125℃ temperature range
2.7 V to 5.5 V power supply
Easy implementation
User selectable gain of 1 or 2 (GAIN pin)
1.8 V logic compatibility
50 MHz SPI with readback or daisy chain
Robust 2 kV HBM and 1.5 kV FICDM ESD rating
20-lead, TSSOP RoHS-compliant package
AD5672R/AD5676R應用:
Optical transceivers
Base station power amplifiers
Process control (PLC input/output cards)
Industrial automation
Data acquisition systems
圖1. AD5672R/AD5676R功能框圖
圖2. AD5672R/AD5676R菊花鏈接圖
AD5676R評估板EVAL-AD5676SDZ/EVAL-AD5676RSDZ
This user guide details the operation of the evaluation boards for the AD5676/AD5676R octal channel, voltage output digital-to-analog converter (DAC).
The EVAL-AD5676SDZ/EVAL-AD5676RSDZ evaluation boards help users to quickly prototype new AD5676/AD5676R circuits and reduce design time. The AD5676/AD5676R operate from a single 2.7 V to 5.5 V supply. The AD5676R has an internal 2.5 V reference giving a maximum output voltage of 2.5 V or 5 V. The AD5676 does not have an internal reference; therefore, an ADR431 is provided on-board as a 2.5 V reference source. A different reference voltage can be applied via the EXT_REF SMB connector, if required. Full data on the AD5676/AD5676R are available in the respective product data sheets, available from Analog Devices, which should be consulted in conjunction with this user guide when using the evaluation boards.
The evaluation boards interface to the USB port of a PC via the SDP board. Software is supplied with the evaluation board to allow the user to program the AD5676/AD5676R.
The evaluation boards are compatible with the EVAL-SDP-CB1Z Blackfin® SDP controller board (SDP-B), which is available for order on the Analog Devices website at www.analog.com.
評估板EVAL-AD5676SDZ/EVAL-AD5676RSDZ主要特性:
Full featured evaluation board for the AD5676/AD5676R
Various link options
PC control in conjunction with the Analog Devices, Inc., EVAL-SDP-CB1Z system demonstration platform (SDP)
評估板EVAL-AD5676SDZ/EVAL-AD5676RSDZ包括:
EVAL-AD5676SDZ/EVAL-AD5676RSDZ evaluation board
CD includes
Self-installing evaluation software that allows users to control the board and exercise all functions of the device
Electronic version of the EVAL-AD5676SDZ/ EVAL-AD5676RSDZ user guide
ADDITIONAL EQUIPMENT AND SOFTWARE NEEDED
EVAL-SDP-CB1Z SDP board, includes a USB cable
PC running Windows XP SP2, Windows Vista, or Windows 7 with USB 2.0 port
ONLINE RESOURCES
Documents Needed
AD5676/AD5676R data sheet
EVAL-AD5676SDZ/EVAL-AD5676RSDZ user guide
Required Software
AD5676(R) evaluation software (download from the EVAL-AD5676SDZ/EVAL-AD5676RSDZ product pages)
Design and Integration Files
Schematics, layout files, bill of materials
圖3. 評估板EVAL-AD5676SDZ/EVAL-AD5676RSDZ建立圖
圖4. 評估板EVAL-AD5676SDZ/EVAL-AD5676RSDZ框圖
圖5. 評估板EVAL-AD5676SDZ/EVAL-AD5676RSDZ電路圖(1)
圖6. 評估板EVAL-AD5676SDZ/EVAL-AD5676RSDZ電路圖(2)
評估板EVAL-AD5676SDZ/EVAL-AD5676RSDZ材料清單:
AD5672R/AD5676R 分別是低功耗、8通道、12/16位緩沖電壓輸出數模轉換器(DAC)，內置2.5 V、2 ppm/˚C內部基準電壓源（默認使能）和增益選擇引腳，滿量程輸出為2.5 V（增益=1）或5 V（增益=2）。 采用2.7 V至5.5 V單電源供電，通過設計保證單調性。 這些器件采用20引腳TSSOP封裝。
AD5672R/AD5676R還內置一個上電復位電路和一個RSTSEL引腳，確保DAC輸出上電至零電平或中間電平，直到執(zhí)行一次有效的寫操作為止。 每個器件都具有各通道獨立掉電特性，在掉電模式下，器件功耗降至2.5 µA。
AD5672R/AD5676R采用多功能串行外設接口(SPI)，時鐘速率最高達50 MHz，并均包含一個為1.8 V/3 V/5 V邏輯電平準備的VLOGIC引腳。
產品特色
高相對精度(INL)。
AD5672R（12位）：±0.1 LSB（最大值）
AD5676R（16位）：±3 LSB（最大值）
低漂移2.5 V片內基準電壓源。 |
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