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Medical device solution based on AD4002

The AD4002 is low noise, low power, high speed, 18-bit, precision successive approximation register (SAR) analog-to-digital converters (ADCs). The AD4002 offer 2 MSPS, 1 MSPS, and 500 kSPS throughputs, respectively. They incorporate ease of use features that reduce signal chain power consumption, reduce signal chain complexity, and enable higher channel density.
Solution Introduction

The AD4002 is low noise, low power, high speed, 18-bit, precision successive approximation register (SAR) analog-to-digital converters (ADCs). The AD4002 offer 2 MSPS, 1 MSPS, and 500 kSPS throughputs, respectively. They incorporate ease of use features that reduce signal chain power consumption, reduce signal chain complexity, and enable higher channel density. 

The high-Z mode, coupled with a long acquisition phase, eliminates the need for a dedicated high power, high speed ADC driver, thus broadening the range of low power precision amplifiers that can drive these ADCs directly while still achieving optimum performance. 

The input span com-pression feature enables the ADC driver amplifier and the ADC to operate off common supply rails without the need for a negative supply while preserving the full ADC code range. The low serial peripheral interface (SPI) clock rate requirement reduces the digital input/output power consumption, broadens processor options, and simplifies the task of sending data across digital isolation.

Operating from a 1.8 V supply, the AD4002/AD4006/AD4010 sample an analog input (IN+) from 0 V to VREF with respect to a ground sense (IN−) with VREF ranging from 2.4 V to 5.1 V. The AD4002 consumes only 14 mW at 2 MSPS with a minimum SCK rate of 75 MHz in turbo mode; the AD4006 consumes only 7 mW at 1 MSPS; and the AD4010 consumes only 3.5 mW at 500 kSPS. The AD4002/AD4006/AD4010 all achieve ±3.2 LSB integral nonlinearity error (INL) maximum, no missing codes at 18 bits, and 95 dB signal-to-noise ratio (SNR) for an input frequency (fIN) of 1 kHz. The reference voltage is applied externally and can be set independently of the supply voltage.

The SPI-compatible versatile serial interface features seven different modes including the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus, and provides an optional busy indicator.

The AD4002 is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic, using the separate VIO supply.

The AD4002 is available in a 10-lead MSOP and 10-lead LFCSP, and the AD4010 is available in a 10-lead LFCSP, with operation specified from −40℃ to +125℃. The devices are pin compatible with the 18-bit, 2 MSPS AD4003 (see Table 8).

Medical device solution framework based on AD4002

Medical device solution framework based on AD4002


The AD4002 Key Features:
  Throughput: 2 MSPS/1 MSPS/500 kSPS options
  INL: ±3.2 LSB maximum
  Guaranteed 18-bit, no missing codes
  Low power: 70 μW at 10 kSPS, 14 mW at 2 MSPS (total)
  9.75 mW at 2 MSPS, 4.9 mW at 1 MSPS, 2.5 mW at 500 kSPS (VDD only)
  SNR: 95 dB typical at 1 kHz, VREF = 5 V; 95 dB typical at 100 kHz
  THD: −125 dB typical at 1 kHz, VREF = 5 V; −108 dB typical at 100 kHz
  Ease of use features reduce system power and complexity
  Input overvoltage clamp circuit
  Reduced nonlinear input charge kickback
  High-Z mode
  Long acquisition phase
  Input span compression
  Fast conversion time allows low SPI clock rates
  SPI-programmable modes, read/write capability, status word
  Pseudo differential (single-ended) analog input range
  0 V to VREF with VREF from 2.4 V to 5.1 V
  Single 1.8 V supply operation with 1.71 V to 5.5 V logic interface
  SAR architecture: no latency/pipeline delay, valid first conversion
  First conversion accurate
  Guaranteed operation: −40℃ to +125℃
  SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface
  Ability to daisy-chain multiple ADCs and busy indicator

  10-lead packages: 3 mm × 3 mm LFCSP, 3 mm × 4.90 mm MSOP


The AD4002/AD4006/AD4010 Application

  Automatic test equipment
  Machine automation
  Medical equipment
  Battery-powered equipment

  Precision data acquisition systems


AD4002/AD4006/AD4010 Multiple Power Supply Typical Application Block Diagram


.AD4002/AD4006/AD4010 Multiple Power Supply Typical Application Block Diagram


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Key Components
No. Part Number Manufacturer
1 AD4002 ADSEMI
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