AD7689 16-Bit, 8-Channel,250 kSPS PulSAR ADC

The AD7682/AD7689 are 4-channel/8-channel, 16-bit, charge redistribution successive approximation register (SAR) analogto-digital converters (ADCs) that operate from a single power supply, VDD.

The AD7682/AD7689 contain all components for use in a multichannel, low power data acquisition system, including a true 16-bit SAR ADC with no missing codes; a 4-channel (AD7682) or 8-channel (AD7689) low crosstalk multiplexer that is useful for configuring the inputs as single-ended (with or without ground sense), differential, or bipolar; an internal low drift reference (selectable 2.5 V or 4.096 V) and buffer; a temperature sensor; a selectable one-pole filter; and a sequencer that is useful when channels are continuously scanned in order.

The AD7682/AD7689 use a simple SPI interface for writing to the configuration register and receiving conversion results. The SPI interface uses a separate supply, VIO, which is set to the host logic level. Power dissipation scales with throughput.

The AD7682/AD7689 are housed in a tiny 20-lead LFCSP and 20-lead WLCSP with operation specified from −40°C to +85°C.

Applications

Features and Benefits
  • 16-bit resolution with no missing codes
  • 8-channel multiplexer with choice of inputs
  • Unipolar single-ended
  • Differential (GND sense)
  • Pseudobipolar
  • Throughput: 250 kSPS
  • INL: ±0.4 LSB typical, ±1.5 LSB maximum (±23 ppm or FSR)
  • Dynamic range: 93.8 dB
  • SINAD: 92.5 dB at 20 kHz
  • THD: −100 dB at 20 kHz
  • Analog input range: 0 V to VREF with VREF up to VDD
  • See data sheet for additional features
  • Analog to Digital Converters
    Reference Designs
    Data Sheets
    Documentnote
    AD7682/AD7689: 16-Bit, 4-Channel/8-Channel, 250 kSPS PulSAR ADC Data Sheet (Rev. F)PDF 673.58 K
    Application Notes
    Documentnote
    AN-742: Frequency Domain Response of Switched-Capacitor ADCs (Rev. B)PDF 401 kB
    AN-931: Understanding PulSAR ADC Support Circuitry (Rev. 0)PDF 299 kB
    AN-932: Power Supply Sequencing (Rev. 0)PDF 95 kB
    Technical Books
    Documentnote
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD7689ACPZ Production20 ld LFCSP (4x4mm 2.5EP)OTH 490-40 to 85C6.635.99Y
    AD7689ACPZRL7 Production20 ld LFCSP (4x4mm 2.5EP)REEL 1500-40 to 85C05.99Y
    AD7689BCBZ-RL7 Production20-Ball Wafer Level Chip Scale Package [WLCSP]REEL 1500-40 to 85C07.07Y
    AD7689BCPZ Production20 ld LFCSP (4x4mm 2.5EP)OTH 490-40 to 85C7.827.07Y
    AD7689BCPZRL7 Production20 ld LFCSP (4x4mm 2.5EP)REEL 1500-40 to 85C07.07Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    EVAL-AD7689EDZEvaluation Board99Y
    EVAL-CED1ZEvaluation Board249Y
    Reference Materials
    AD7682/AD7689:16位、4/8通道250kPSP PulSAR ADC 数据手册 (Rev. B) ad7682
    AD7682/AD7689: 16-Bit, 4-Channel/8-Channel, 250 kSPS PulSAR ADC Data Sheet (Rev. F) ad7682
    CN0254 设计与集成文件 adp3336
    AN-742: Frequency Domain Response of Switched-Capacitor ADCs (Rev. B) ad7476
    AN-931: Understanding PulSAR ADC Support Circuitry (Rev. 0) ad7476
    AN-932: 电源时序控制 (Rev. 0) ad7628
    AN-931: 了解PulSAR ADC支持电路 (Rev. 0) ad7476
    AN-932: Power Supply Sequencing (Rev. 0) ad7660
    MT-031: 实现数据转换器的接地并解开AGND和DGND的谜团 ad6672
    MT-002: 奈奎斯特准则对数据采样系统设计有何意义 ad6672
    SAR ADC & Driver Quick-Match Guide ad7476
    CN-0254:16位、250 kSPS、8通道、单电源、隔离式数据采集系统 adp3336
    Exploring Different SAR ADC Analog Input Architectures ad7982
    MS-2210:高速ADC的电源设计 ad9861
    MS-1779:九项常被忽略的ADC技术规格 ad6672