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ADI new product_the AD8452

Published time: 2018-05-14

About ADI
They enable their customers to interpret the world around us by intelligently bridging the physical and digital with unmatched technologies that sense, measure and connect.

Building the Solutions of Tomorrow.

Solving the problems of tomorrow and today relies on intelligently bridging the digital and analog worlds. At Analog Devices, they create unmatched technologies and solutions to solve their customers' problems in instrumentation, automation, communications,healthcare, automotive and numerous other industries.

Foreword about the AD8452

Analog Devices, Inc. (ADI) today announced the release of an integrated precision solution for battery testing and formation. This solution integrates an analog front end, controller and pulse width modulator (PWM) to enhance lithium. Ion battery formation and classification system accuracy and efficiency. Compared with traditional technology, the new AD8452 can provide 50% more channels in the same space, thereby expanding capacity and increasing battery output. The switching technology used in the AD8452 recovers the battery's energy during discharge, providing up to 10 times the accuracy of traditional switching solutions. Higher accuracy means that more batteries can be placed in the battery pack, which helps to extend battery life in applications such as electric vehicles. In addition, the device combines superior detection and monitoring capabilities to effectively prevent overcharging and undercharging that may cause battery failure, thereby increasing the safety of the manufacturing process. The AD8452 can save up to 50% bill of materials (BoM) cost for the charge/discharge board, saving about 20% in system cost. The device has a matching system simulation demo board that can reduce R&D project costs and shorten time-to-market for test equipment manufacturers.

Product Details about The AD8452

The AD8452 combines a precision analog front-end controller and switch mode power supply (SMPS), pulse-width modulator (PWM) driver into a single silicon platform for high volume battery testing and formation manufacturing. A precision instrumentation amplifier (in-amp) measures the battery charge/discharge current to better than ±0.1% accuracy, while an equally accurate difference amplifier measures the battery voltage. Internal laser trimmed resistor networks establish the in-amp and difference amplifier gains (66 V/V and 0.4 V/V, respectively), and stabilize the AD8452 performance across the rated operating temperature range.

Desired battery cycling current and voltage levels are established by applying precise control voltages to the ISET and VSET inputs. Actual charge and discharge current levels are sensed (usually by a high power, highly accurate shunt resistor) whose value is carefully selected according to system parameters. Switching between constant current (CC) and constant voltage (CV) loop integration is instantaneous, automatic, and completely transparent to the observer. A logic high at the MODE input selects the charge or discharge mode (high for charge, low for discharge).

The AD8452 simplifies designs by providing excellent performance, functionality, and overall reliability in a space saving 48-lead, 7 mm × 7 mm × 1.4 mm LQFP package rated for operation at temperatures from −40°C to +85°C.

The AD8452

Features and Benefits

CC and CV battery test and formation modes with transparent and automatic switchover, for systems of 20 Ah or less

Precise measurement of voltage and current
Independent feedback control blocks
Highly accurate, factory trimmed instrumentation and differential amplifiers
In-amp for current sense gain: 66 V/V
Difference amplifier for voltage sense gain: 0.4 V/V
Stable over temperature: offset voltage drift <0.6 μV/°C (maximum)
Gain drift: <3 ppm/°C (maximum)
Current sense CMRR: 120 dB minimum
Popular SMPS control for charge/discharge
High PWM linearity with internal ramp voltage
50 kHz to 300 kHz user controlled switching frequency
Synchronization output or input with adjustable phase shift

Programmable soft start

Product Applications

Battery formation and testing
High efficiency battery test systems with recycle capability
Battery conditioning (charging and discharging) systems

Product download addresss:

Two related products introduction:The AD8452-EVALZ and The AD4002

The AD8452-EVALZ is a platform for the AD8452, designed for investigation of the AD8452 analog and pulse-width modulation (PWM) features and performance without the added complications of a driver and/or switch mode power supply (SMPS) design. For convenience, a precision 5 V reference IC and four trim pots are built in to the evaluation board, for driving the battery current and voltage ISET and VSET inputs. All device pins are accessible with test loops or probe landings.

At the same time, the AD8452-EVALZ has the flexibility to interface and drive a typical half bridge inductor input SMPS with output levels in the 1 A to 15 A range. SMPS and associated components are specified and sourced by the user.

The AD8452 is intended for use as the core controller for commercial battery test and formation systems. Its advanced miniaturization and extraordinarily high level of analog precision meet the challenge of mass production of high energy density storage lithium ion packs for transportation and energy storage in homes.

When working with the evaluation board, consult the AD8452 data sheet for a detailed device Theory of Operation and for additional information in conjunction with user guide UG-1180.

Features and Benefits

Pin accessible, standalone AD8452
Simplified operation: connect a power supply and scope and start looking at waveforms
On-board precision 5 V reference included for accurate gain measurements
Factory tested
Four optional control loops available but not necessary for operation; may be bypassed as desired

Safe: only low power circuitry is present; no accidental power discharges

The AD4002 is available in a 10-lead MSOP or a 10-lead LFCSP with operation specified from −40°C to +125°C. The device is pin compatible with the 18-bit, 2 MSPS AD4003.

The AD4002 is a low noise, low power, high speed, 18-bit, 2 MSPS precision successive approximation register (SAR) analog-to-digital converter (ADC). It incorporates ease of use features that lower the signal chain power, 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 this ADC directly while still achieving optimum performance. The input span compression 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 samples an analog input (IN+) between 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 of 75 MHz SCK rate in turbo mode and achieves ±3.2 LSB INL maximum, no missing codes at 18 bits with 95 dB SNR. 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.

More information about  the AD4002

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