Analog DevicesADAQ4381-4BBCZ数据采集系统

ADAQ4381-4: Quad, 14-bit, 4 MSPS, Simultaneous Sampling, μModule Data Acquisition Solution

The ADAQ4381-4 is a quad-channel precision data acquisition (DAQ) signal chain μModule solution that reduces the development cycle of a precision measurement system by transferring the signal chain design challenges of component selection, optimization, and layout from the designer to the device.

Using system-in-package (SIP) technology, the ADAQ4381-4 reduces end system component count by combining multiple common signal processing and conditioning blocks into a single device. These blocks include a quad-channel, high resolution 14-bit, 4 MSPS simultaneous sampling SAR ADC, low noise, fully differential ADC driver amplifier, a 3.3 V precision voltage reference, low-noise buffer amplifiers, and low-dropout linear regulator.

The ADAQ4381-4 has an on-chip oversampling blocks to improve the dynamic range and reduce noise at lower bandwidths. The oversampling can boost up to two bits of added resolution. It provides the flexibility of a configurable ADC driver feedback loop to allow four gain and attenuation adjustments, and accept both fully differential or single-ended to differential input configuration.

Using Analog Devices, Inc. iPassives® technology, the ADAQ4381-4 incorporates critical passive components with superior matching and drift characteristics to minimize temperature dependent error sources and to offer optimized signal chain performance. Housed in a small 8 mm × 8 mm × 0.8 mm pitch, 81- ball CSP_BGA package, the ADAQ4381-4 enables compact design without sacrificing performance and simplifies end system bill of materials management. The ADAQ4381-4's optimum performance is guaranteed with a single 5 V supply operation, all the required bypass and decoupling capacitors are included inside the package. The level of ADAQ4381-4 system integration solves many design challenges, which enables a compact and simple solution for a multichannel application.

The conversion result can clock out simultaneously through 4-wire mode for faster throughput or through 1-wire serial mode when slower throughput is allowed. The ADAQ4381-4 is compatible with 1.8 V, 2.5 V, and 3.3 V interfaces using the separate logic supply. The ADAQ4381-4 is specified to operate over a temperature range of −40°C to +105°C.

Key Features and Benefits

• •  Easy to use μModule® data acquisition system
• •  11× footprint reduction vs. discrete solution
• •  Integrated critical passive components
• •  5 V single supply operation
• •  Guaranteed 14-bit no missing codes
• •  On-chip oversampling function
• •  2-bit resolution boost
• •  Out of range Indicator (ALERT)
• •  INL: ±0.3 LSB typical, ±1 LSB maximum
• •  SNR (typical)
• •  85 dB at Gain = 1.0, f_IN= 1 kHz
• •  92.4 dB with OSR = ×8 at Gain = 1.0, f_IN= 1 kHz
• •  Channel-to-Channel phase matching: 0.005° typical at fIN= 20kHz
• •  Integrated high precision reference, 3 ppm/°C typical drift
• •  Gain error: 0.003% typical
• •  Gain drift: 0.8 ppm/°C typical
• •  Integrated internal buffer with VCM generation
• •  Integrated fully differential ADC driver with signal scaling
• •  Wide input common-mode voltage range
• •  High common-mode rejection
• •  Single-ended to differential conversion
• •  Pin selectable input range with overrange
• •  Input range: ±2 V, ±3.3 V, ±5.5 V, ±11 V
• •  Gain/Attenuation: G = 0.3, 0.6, 1.0, and 1.6
• •  High-speed serial interface
• •  8 mm x 8 mm, 0.8 mm pitch, 81-ball CSP_BGA package

Applications

• •  Lab grade battery test system
• •  Motor control current sense
• •  Motor control position feedback
• •  Sonar
• •  Power quality monitoring
• •  Data acquisition system
• •  Erbium-Doped Fiber Amplifier (EDFA) applications
• •  I and Q demodulation

Evaluation Board

The ADAQ4381-4 can be evaluated with the EVAL-ADAQ4381-4.

Block Diagrams and Tables