AD7989-1 18-Bit, 100 kSPS PulSAR ADCs in MSOP/LFCSP

The AD7989-1/AD7989-5 are 18-bit, successive approximation, analog-to-digital converters (ADC) that operate from a single power supply, VDD. They contain a low power, high speed, 18-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, the AD7989-1/AD7989-5 sample the voltage difference between the IN+ and IN− pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. The reference voltage, REF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput.

The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus. It is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic, using the separate VIO supply.

The AD7989-1/AD7989-5 are available in a 10-lead MSOP or a 10-lead LFCSP with operation specified from −40°C to +85°C.

APPLICATIONS
  • Battery-powered equipment
  • Data acquisition systems
  • Medical instruments
  • Seismic data acquisition systems
Features and Benefits
  • Low power dissipation
    400 μW at 100 kSPS (VDD only)
    700 μW at 100 kSPS (total)
  • 18-bit resolution with no missing codes
    Throughput: 100 kSPS
  • INL: ±1 LSB typical,
    ±2 LSB maximum
  • SNR: 98 dB at 1 kHz
    (VREF = 5 V)
  • SINAD: 97 dB at 1 kHz
  • THD: −120 dB at 10 kHz
  • Dynamic range: 99 dB
  • True differential analog input range: ±VREF
    0 V to VREF with VREF between
    2.4 V and 5.1 V
    Allows use of any input range
    Easy to drive with the ADA4941-1
  • No pipeline delay
  • Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
  • SPI-/QSPI™-/MICROWIRE™-/DSP-compatible serial interface
  • Ability to daisy-chain multiple ADCs
  • 10-lead package: MSOP and 3 mm × 3 mm LFCSP
Analog to Digital Converters
Data Sheets
Documentnote
AD7989-1/AD7989-5: 18-Bit, 100 kSPS/500 kSPS PulSAR ADCs in MSOP/LFCSP Data Sheet (Rev. A)PDF 514 kB
Application Notes
Documentnote
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-931: Understanding PulSAR ADC Support Circuitry (Rev. 0)PDF 299 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD7989-1BCPZ-R2 Contact ADI10 ld LFCSP (3x3mm)REEL 250-40 to 85C9.27.8Y
AD7989-1BCPZ-RL7 Production10 ld LFCSP (3x3mm)REEL 1500-40 to 85C07.8Y
AD7989-1BRMZ Production10 ld MSOPOTH 50-40 to 85C9.27.8Y
AD7989-1BRMZ-RL7 Production10 ld MSOPREEL 1000-40 to 85C07.8Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
EVAL-AD7989-5SDZEvaluation Board99Y
EVAL-SDP-CB1ZEvaluation Board99Y
Reference Materials
AD7989-1/AD7989-5:18 位、 100 kSPS/500 kSPS PulSAR ADC ,采用 MSOP/LFCSP 封装 (Rev. A) ad7989-1
AD7989-1/AD7989-5: 18-Bit, 100 kSPS/500 kSPS PulSAR ADCs in MSOP/LFCSP Data Sheet (Rev. A) ad7989-1
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-931: Understanding PulSAR ADC Support Circuitry (Rev. 0) ad7476
AN-931: 了解PulSAR ADC支持电路 (Rev. 0) ad7476
AN-935: ADC变压器耦合前端设计[中文版] (Rev. 0) ad6655
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
MT-001: 揭开公式(SNR = 6.02N + 1.76dB)的神秘面纱 ad6672
MT-074: 精密ADC用差分驱动器 ad7687
SAR ADC & Driver Quick-Match Guide ad7476
Front-End Amplifier and RC Filter Design for a Precision SAR... ad7685
CN0237: 超低功耗、18位、差分PulSAR ADC驱动 ada4940-1
CN-0180: Precision Single-Supply Differential ADC Driver for... ad7982
CN-0032: Converting a Single-Ended Signal with the AD7982 Differential... ad7982
MS-2124: Understanding AC Behaviors of High Speed ADCs ad7091r
MS-2210:高速ADC的电源设计 ad9861
MS-2022: 成功进行模数信号转换的七个步骤(为实现正确信号调理的噪声计算) ad7989-1
MS-1779:九项常被忽略的ADC技术规格 ad6672