AD4056中文资料Compact, Low Power, 12-Bit, 2 MSPS/500 kSPS Easy Drive SAR ADC数据手册ADI规格书

描述 Description

The AD4050/AD4056 are versatile, 12-bit, successive approximationregister (SAR) analog-to-digital converters (ADCs) that enablelow-power, high-density data acquisition solutions without sacrificingprecision. These ADCs offer a unique balance of performanceand power efficiency, plus innovative features for seamlesslyswitching between high-resolution and low-power modes tailored tothe immediate needs of the system. The AD4050/AD4056 are idealfor battery-powered, compact data acquisition and edge sensingapplications.

The Easy Drive features enable highly efficient analog front end(AFE) designs. The small sampling capacitors (3.4 pF) maximize inputimpedance, thus reducing the dependence on high-bandwidth,power-hungry amplifiers typically required by SAR ADCs. The wideinput common-mode range grants inherent support for both differentialand single-ended signals.

The AD4050/AD4056 support microcontrollers with power-downmodes and interrupt-driven firmware. The autonomous modes enableout-of-range event detection while the digital host sleeps.The averaging modes deliver on-demand, high-resolution measurementswhile offloading computations from the host processor. Theself timed device enable signal (DEV_EN) synchronizes AFE devicepower cycling to the ADC sampling instant, optimizing systempower consumption while minimizing power-up settling error artifacts.The AD4050/AD4056 also support power cycling the voltagereference and using the supply as the ADC reference voltage(VREF) for additional power savings.

The device configuration and ADC data readback are supportedvia a robust, 4-wire serial peripheral interface (SPI) with cyclicredundancy check (CRC) supported for all data transfers. TheAD4050/AD4056 are available in compact LFCSP and WLCSPpackages and operate across a wide temperature range, makingthem ideal for a diverse set of applications.

特性 Features

Small footprint, big performance
INL: ±0.1 LSB maximum
SNR: 73.8 dB with VREF = 3.3 V
1.35 nJ per conversion
1.35 mW/0.68 mW at 1 MSPS/500 kSPS in sample mode
370 μW/112 μW at 1 MSPS/300 kSPS in autonomous modes
4.1 μW standby power
Versatile signal conditioning integration
Easy Drive features enable small, low-power AFE designs
Compatible with differential and single-ended signal chains
Wide common-mode input range

Minimizes digital host activity and power dissipation
Autonomous sampling with window comparator and interrupt generation
Averaging filter with continuous and burst sampling options
Power cycling synchronization for companion devices
4-wire SPI compatible with 1.8 V to 3.3 V logic
2.00 mm × 2.6 mm LFCSP and 1.67 mm × 1.97 mm WLCSP
Wide operating temperature range: −40°C to +125°C

应用 Application

Battery-powered data acquisition
Vital signs monitoring
Biological and chemical analysis
Geologic and seismic sensing
Motion and robotics