AD9251 14-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 1.8 V Dual Analog-to-Digital Converter

The AD9251 operates from a single 1.8 V analog power supply and features a separate digital output driver supply to accommodate 1.8 V to 3.3 V logic families. The patented sample-and-hold circuit maintains excellent performance for input frequencies up to 200 MHz and is designed for low cost, low power, and ease of use. A standard serial port interface supports various product features and functions, such as data output formatting, internal clock divider, power-down, DCO/DATA timing and offset adjustments, and voltage reference modes. The AD9251 is packaged in a 64-lead RoHS compliant LFCSP that is pin compatible with the AD9268 16-bit ADC, the AD9258 14-bit ADC, the AD9231 12-bit ADC, and the AD9204 10-bit ADC, enabling a simple migration path between 10-bit and 16-bit converters sampling from 20 MSPS to 125 MSPS.

The AD9251 is a monolithic, dual-channel, 1.8 V supply, 14-bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS analog-to-digital converter (ADC). It features a high performance sample-andhold circuit and on-chip voltage reference.

The product uses multistage differential pipeline architecture with output error correction logic to provide 14-bit accuracy at 80 MSPS data rates and to guarantee no missing codes over the full operating temperature range.

The ADC contains several features designed to maximize flexibility and minimize system cost, such as programmable clock and data alignment and programmable digital test pattern generation. The available digital test patterns include built-in deterministic and pseudorandom patterns, along with custom user-defined test patterns entered via the serial port interface (SPI).

A differential clock input controls all internal conversion cycles. An optional duty cycle stabilizer (DCS) compensates for wide variations in the clock duty cycle while maintaining excellent overall ADC performance.

The digital output data is presented in offset binary, gray code, or twos complement format. A data output clock (DCO) is provided for each ADC channel to ensure proper latch timing with receiving logic. Both 1.8 V and 3.3 V CMOS levels are supported and output data can be multiplexed onto a single output bus.

The AD9251 is available in a 64-lead RoHS Compliant LFCSP and is specified over the industrial temperature range (−40°C to +85°C).

Product Highlights
  • The AD9251 operates from a single 1.8 V analog power supply and features a separate digital output driver supply to accommodate 1.8 V to 3.3 V logic families.
  • The patented sample-and-hold circuit maintains excellent performance for input frequencies up to 200 MHz and is designed for low cost, low power, and ease of use.
  • A standard serial port interface supports various product features and functions, such as data output formatting, internal clock divider, power-down, DCO/DATA timing and offset adjustments, and voltage reference modes.
  • The AD9251 is packaged in a 64-lead RoHS compliant LFCSP that is pin compatible with the AD9268 16-bit ADC, the AD9258 14-bit ADC, the AD9231 12-bit ADC, and the AD9204 10-bit ADC, enabling a simple migration path between 10-bit and 16-bit converters sampling from 20 MSPS to 125 MSPS.
Applications
  • Communications
  • Diversity radio systems
  • Multimode digital receivers GSM, EDGE, W-CDMA, LTE, CDMA2000, WiMAX, TD-SCDMA
  • I/Q demodulation systems
  • Smart antenna systems
  • Battery-powered instruments
  • Hand held scope meters
  • Portable medical imaging
  • Ultrasound
  • Radar/LIDAR
Features and Benefits
  • 1.8 V analog supply operation
  • 1.8 V to 3.3 V output supply
  • SNR
    • 74.3 dBFS at 9.7 MHz input
    • 71.5 dBFS at 200 MHz input
  • 74.3 dBFS at 9.7 MHz input
  • 71.5 dBFS at 200 MHz input
  • SFDR
    • 93 dBc at 9.7 MHz input
    • 80 dBc at 200 MHz input
  • 93 dBc at 9.7 MHz input
  • 80 dBc at 200 MHz input
  • Low power
    • 33 mW per channel at 20 MSPS
    • 73 mW per channel at 80 MSPS
  • 33 mW per channel at 20 MSPS
  • 73 mW per channel at 80 MSPS
  • Differential input with 700 MHz bandwidth
  • On-chip voltage reference and sample-and-hold circuit
  • 2 V p-p differential analog input
  • DNL = ±0.45 LSB
  • Serial port control options
    • Offset binary, gray code, or twos complement data format
    • Optional clock duty cycle stabilizer
    • Integer 1-to-8 input clock divider
    • Data output multiplex option
    • Built-in selectable digital test pattern generation
    • Energy-saving power-down modes
    • Data clock out with programmable clock and data alignment
  • Offset binary, gray code, or twos complement data format
  • Optional clock duty cycle stabilizer
  • Integer 1-to-8 input clock divider
  • Data output multiplex option
  • Built-in selectable digital test pattern generation
  • Energy-saving power-down modes
  • Data clock out with programmable clock and data alignment
    • Analog to Digital Converters
    Security and Surveillance
    • Scanning Equipment
    AD9251 IBIS Models
    Data Sheets
    Documentnote
    AD9251: 14-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 1.8 V Dual Analog-to-Digital Converter Data Sheet (Rev. B)PDF 1.01 M
    Application Notes
    Documentnote
    AN-878: High Speed ADC SPI Control Software (Rev. A)PDF 585 kB
    AN-905: Visual Analog Converter Evaluation Tool Version 1.0 User Manual (Rev. 0)PDF 2124 kB
    AN-827: A Resonant Approach to Interfacing Amplifiers to Switched-Capacitor ADCs (Rev. 0)PDF 203 kB
    AN-935: Designing an ADC Transformer-Coupled Front End (Rev. 0)PDF 363 kB
    AN-742: Frequency Domain Response of Switched-Capacitor ADCs (Rev. B)PDF 401 kB
    AN-1142: Techniques for High Speed ADC PCB Layout (Rev. 0)PDF 392 kB
    AN-807: Multicarrier WCDMA Feasibility (Rev. 0)PDF 969 kB
    AN-808: Multicarrier CDMA2000 Feasibility (Rev. 0)PDF 1535 kB
    AN-812: MicroController-Based Serial Port Interface (SPI) Boot Circuit (Rev. 0)
    Software Download (zip, 21,702,560 bytes)    		PDF 441 kB
    User Guides
    Documentnote
    UG-003: Evaluating the AD9650/AD9268/AD9258/AD9251/AD9231/AD9204 Analog-to-Digital ConvertersPDF 2699 kB
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD9251BCPZ-20 Production64 ld LFCSP (9x9mm, 6.20mm exposed pad)OTH 260-40 to 85C21.7618.5Y
    AD9251BCPZ-40 Production64 ld LFCSP (9x9mm, 6.20mm exposed pad)OTH 260-40 to 85C28.123.89Y
    AD9251BCPZ-65 Production64 ld LFCSP (9x9mm, 6.20mm exposed pad)OTH 260-40 to 85C41.1835Y
    AD9251BCPZ-80 Production64 ld LFCSP (9x9mm, 6.20mm exposed pad)OTH 260-40 to 85C44.1237.5Y
    AD9251BCPZRL7-20 Production64 ld LFCSP (9x9mm, 6.20mm exposed pad)REEL 750-40 to 85C21.7618.5Y
    AD9251BCPZRL7-40 Production64 ld LFCSP (9x9mm, 6.20mm exposed pad)REEL 750-40 to 85C28.123.89Y
    AD9251BCPZRL7-65 Production64 ld LFCSP (9x9mm, 6.20mm exposed pad)REEL 750-40 to 85C41.1835Y
    AD9251BCPZRL7-80 Production64 ld LFCSP (9x9mm, 6.20mm exposed pad)REEL 750-40 to 85C44.1237.5Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    AD9251-20EBZEvaluation Board200Y
    AD9251-40EBZEvaluation Board200Y
    AD9251-65EBZEvaluation Board200Y
    AD9251-80EBZEvaluation Board200Y
    Reference Materials
    AD9251: 14-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 1.8 V Dual Analog-to-Digital Converter Data Sheet (Rev. B) ad9251
    AD9251BCPZ (All Speed Grades) ad9251
    AD9251参考代码 ad9251
    AN-878: High Speed ADC SPI Control Software (Rev. A) ad6655
    AN-808: CDMA2000多载波系统可行性研究 (Rev. 0) adl5330
    AN-905: Visual Analog Converter Evaluation Tool Version 1.0 User Manual (Rev. 0) ad9220
    AN-827: A Resonant Approach to Interfacing Amplifiers to Switched-Capacitor ADCs (Rev. 0) ad6655
    AN-935: Designing an ADC Transformer-Coupled Front End (Rev. 0) ad9220
    AN-742: Frequency Domain Response of Switched-Capacitor ADCs (Rev. B) ad7476
    AN-1142: 高速ADC PCB布局布线技巧 (Rev. 0) ad6655
    AN-1142: Techniques for High Speed ADC PCB Layout (Rev. 0) ad6655
    AN-878: 高速ADC SPI控制软件[中文版] (Rev. A) ad6655
    AN-807: 多载波WCDMA的可行性 (Rev. 0) adf4106
    AN-807: Multicarrier WCDMA Feasibility (Rev. 0) ad6655
    AN-808: Multicarrier CDMA2000 Feasibility (Rev. 0) ad9863
    AN-827: 放大器与开关电容ADC接口的匹配方法[中文版] (Rev. 0) ad8351
    AN-905: VisualAnalog™转换器评估工具1.0版用户手册 (Rev. 0) ad6655
    AN-935: ADC变压器耦合前端设计[中文版] (Rev. 0) ad6655
    AN-812: 基于微控制器的串行端口接口(SPI®)启动电路 (Rev. 0) adg3304
    AN-812: MicroController-Based Serial Port Interface (SPI) Boot Circuit (Rev. 0) ad6655
    Software Download (zip, 21,702,560 bytes) ad6655
    UG-003: Evaluating the AD9650/AD9268/AD9258/AD9251/AD9231/AD9204 Analog-to-Digital Converters ad9204
    RF Source Booklet adf9010
    MS-2210：高速ADC的电源设计 ad9861
    Designing 1-ppm DAC Accuracy into Instrumentation Applications - Part 2 ada4937-1
    Designing 1-ppm DAC Accuracy into Instrumentation Applications - Part 1 ada4937-1
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