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Overview
Features and Benefits
- Easy Drive
- Reduced analog input and reference drive requirements
- Overvoltage clamp input current protection up to 5 mA on each analog input
- Long acquisition phase, ≥71.5% (715 ns/1000 ns)of cycle time at 1 MSPS
- High performance
- Sample rate: 500 kSPS (AD4695) or 1 MSPS (AD4696)
- INL: ±1 LSB maximum
- Guaranteed 16-bit, no missing codes
- SINAD: 93 dB typical, VREF = 5 V and fIN = 1 kHz
- Oversampled dynamic range: 111.2 dB, OSR = 64
- Small footprint, high channel density
- 32-lead 5 mm × 5 mm LFCSP
- Easy Drive features support system-level designs with fewer components
- Wide operating temperature range: −40°C to +125°C
- Enhanced digital functionality
- First conversion accurate, no latency or pipeline delay
- Fast conversion time and dual-SDO mode allows low SPI clock rates
- Customizable channel sequencer
- On-chip oversampling and decimation
- Threshold detection alerts
- Offset and gain correction
- Autonomous conversion (autocycle) mode
- SPI-/QPSI-/MICROWIRE-/DSP-compatible serial interface
- Low power
- 8 mW at fS = 1 MSPS (AD4696)
- 4 mW at fS = 500 kSPS (AD4695 and AD4696)
- 4 μW standby power dissipation with the internal LDO disabled
- Internal LDO enables 3.15 V to 5.5 V, single analog supply operation
- 1.14 V to 1.98 V logic interface
Product Details
The AD4695/AD4696 are compact, high accuracy, low power, 16-channel, 16-bit, 500kSPS/1 MSPS, multiplexed input precision successive approximation register (SAR) analog-to-digital converters (ADC) with Easy Drive features and extensive digital functionality.
The AD4695/AD4696 are optimal for use in space-constrained multichannel precision data acquisition systems and monitoring circuits. The AD4695/AD4696 feature a true 16-bit SAR ADC core with no missing codes, a 16-channel, low crosstalk multiplexer, flexible channel sequencer, overvoltage protection clamp circuits on each analog input, on-chip oversampling and decimation, threshold detection and alert indicators, and an autonomous conversion (autocycle) mode.
The AD4695/AD4696 Easy Drive features relax the drive requirements of the analog front end (AFE) and reference circuitry. Analog input high-Z mode and reference input high-Z mode simplify system designs, reduce component count and increase channel density by removing the need for dedicated high-speed ADC drivers and reference buffers.
Input overvoltage protection clamps on each of the analog inputs protect the AD4695/AD4696 from overvoltage events and prevent overvoltage events on one channel from degrading performance on other channels (see Figure 26).
Advanced digital functionality makes the AD4695/AD4696 compatible with a variety of low power digital hosts. The low serial peripheral interface (SPI) clock rate requirements, on-chip customizable channel sequencers, and oversampling and decimation reduces the burden on the digital host system. Autocycle mode and threshold detection features enable low power, interrupt-driven firmware design by performing conversions autonomously and generating alerts based on channel-specific threshold limits.
The AD4695/AD4696 are available in a 5 mm × 5 mm 32-lead LFCSP with operation specified from −40°C to +125°C.
APPLICATIONS
- Photodiode monitoring
- Medical instrumentation
- Vital signs monitoring
- Electronic test and measurement
- Automated test equipment
- Instrumentation and process control
- Battery-powered equipment
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Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Tools & Simulations
IBIS Models
Product Recommendations
AD4695 Companion Parts
Recommended Driver Amplifiers
- For low input bias current, low noise applications: ADA4692-4, ADA4610-4.
- For precision, low power, low distortion applications: ADA4807-4, ADA4805-2.
- For precision, lowest power applications: ADA4084-4, ADA4096-4, ADA4077-4.
Recommended External Voltage References
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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AD4695 Discussions
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.