ADA4522-1ARZ-R7

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1. Describe

ADA4522-1ARZ-R7/ADA4522-2/ADA4522-4 are single/dual/quad Low noise and low power channel, zero-drift operational amplifier, ground Sense input and rail-to-rail output, for total Accuracy under time, temperature and voltage conditions. This Wide operating voltage and temperature range, and High open loop gain and extremely low DC and AC errors make Very suitable for amplifying very small input signals and Used to accurately reproduce larger signals in a variety of different situations application. The performance of ADA4522-1/ADA4522-2/ADA4522-4 is Specified as 5.0 V, 30 V, and 55 V power supply voltages. These The device works in the range of 4.5 V to 55 V and is excellent Suitable for applications that use 5 V, 10 V, 12 V single-ended power supplies, And 30 V, or used to use a higher single power supply and ±2.5 V, ±5 V and ±15 V dual power supplies. ADA4522-1/ ADA4522-2/ADA4522-4 use on-chip filtering to achieve high Anti-electromagnetic interference (EMI). ADA4522-1/ADA4522-2/ADA4522-4 are fully regulated At -40°C to +125°C, available in 8-pin MSOP, 8-pin SOIC, and 14-pin packages SOIC and 14-pin TSSOP packages

2. Feature

    1. Low offset voltage: 5 μV max 

    2. Very low offset voltage drift: up to 22 nV/°C

    3. Low voltage noise density: 5.8 nV/√Hz typ. 0.1 Hz to 10 Hz typ. 117 nV p-p

    4. Low input bias current: 50 pA (typical value)

    5. Unity gain crossover: 3 MHz typical

    6. Single-supply operation: Input voltage range includes ground and rail-to-rail output Wide range of operating voltage

    7. Single power supply: 4.5V to 55V

    8. Dual supply operation: ±2.25 V to ±27.5 V

    9. Integrated EMI filter unity gain stable

3. Application

    1. Inductance, capacitance and resistance (LCR) meter/Megger front-end amplifier

    2. Load cell and bridge sensor

    3. Magnetic balance

    4. High-precision shunt current detection

    5. Thermocouple/resistance temperature detector (RTD) sensor

    6. Programmable logic controller (PLC) input and output Amplifier

4. Principle of Operation

ADA4522-1ARZ-R7/ADA4522-2/ADA4522-4 are single-channel, dual-channel and Quad, ultra-low noise, high voltage, zero drift, rail-to-rail output Operational Amplifier. They use shredding technology, Provides ultra-low input offset voltage and input of 5 μV The maximum offset voltage drift of the ADA4522-1 is 22 nV/°C The maximum value of ADA4522-2 and ADA4522-4 is 25 nV/°C. Due to the common mode voltage swing and Power changes are also corrected by chopping Technology that produces an excellent typical CMRR of 160 dB The PSRR value at 30 V supply voltage is 160 dB. ADA4522-1/ADA4522-2/ADA4522-4 have a wide working range The voltage ranges from ±2.25 V (or 4.5 V) to ±27.5 V (or 55 V). This The devices are single-supply amplifiers, their input voltage The scope includes the lower power rail. They also provide low voltage The noise density is 5.8 nV/√Hz (at f = 1 kHz, AV = 100) and reduce 1/f noise component. These features are very suitable for amplifying low-level signals in high-precision applications. Some Examples of such applications include weighing scales, high precision Current detection, high voltage buffer and signal conditioning Used for temperature sensors, etc. EMI filter and clamp circuit are implemented at the input The front end protects the internal circuit from static electricity Discharge (ESD) stress and high voltage transients. Ability The amplifier suppresses EMI is explained in detail in EMI Rejection rate part. CHOPIN and CHOPOUT are controlled by a clock generator, The operating frequency is 4.8 MHz. The input baseband signal is initially Chopin modulation. Next, CHOPOUT demodulation input Signal and modulate the millivolt input offset voltage and Input the 1/f noise of the transconductance amplifier Gm1 to The chopping frequency is 4.8 MHz. Chopper network removal Low frequency error, but in return, the network introduced Chopping artifacts at the chopping frequency. Therefore, an offset And the ripple correction loop, which works at 800 kHz, is used. This Frequency is the switching frequency of the amplifier. This The circuit reduces chopping artifacts, allowing ADA4522-1/ADA4522-2/ADA4522-4 have high chopping frequency Use minimal artifacts. The thermal shutdown circuit closes the circuit under the following conditions The chip is overheating.