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ADI AD8657ARMZ 18V Micropower Precision Dual Operational Amplifier

Shenzhen Mingjiada Electronics Co., Ltd, as a world-renowned authorised independent distributor of electronic components, has been supplying AD8657ARMZ 18V micropower precision dual operational amplifiers for a long time.With its excellent performance parameters and a wide range of application scenarios, the AD8657ARMZ has become an ideal choice for industrial control, portable devices and sensor interfaces.

Product Description Of AD8657ARMZ

AD8657ARMZ is dual micropower, precision, rail-to-rail input/output amplifiers optimized for low power and wide operating supply voltage range applications.

AD8657ARMZ operate from 2.7 V to 18 V with a typical quiescent supply current of 18 μA. The devices use the DigiTrim® trimming technique, which achieves low offset voltage. The AD8657ARMZ also have high immunity to electromagnetic interference.

The combination of low supply current, low offset voltage, very low input bias current, wide supply range, and rail-to-rail input and output make the AD8657ARMZ ideal for current monitoring in process and motor control applications. The combination of precision specifications makes these devices ideal for dc gain and buffering of sensor front ends or high impedance input sources in wireless or remote sensors or transmitters.

AD8657ARMZ is specified over the extended industrial temperature range (−40°C to +125°C). The AD8657ARMZ is available in an 8-lead MSOP package and an 8-lead LFCSP package.

Specification Of AD8657ARMZ

Product Category: Precision Amplifiers

Number of Channels: 2 Channel

GBP - Gain Bandwidth Product: 230 kHz

SR - Slew Rate: 80 mV/us

Vos - Input Offset Voltage: 350 uV

Ib - Input Bias Current: 20 pA

Supply Voltage - Max: 18 V, +/- 9 V

Supply Voltage - Min: 2.7 V, +/- 1.35 V

Operating Supply Current: 36 uA

Output Current per Channel: 12 mA

CMRR - Common Mode Rejection Ratio: 110 dB

en - Input Voltage Noise Density: 50 nV/sqrt Hz

Package / Case: MSOP-8

Mounting Style: SMD/SMT

Shutdown: No Shutdown

Minimum Operating Temperature: - 40 ℃

Maximum Operating Temperature: + 125 ℃

Dual Supply Voltage: 1.35 V to 9 V

Input Voltage Range - Max: 18 V

Maximum Dual Supply Voltage: 9 V

Minimum Dual Supply Voltage: 1.35 V

Operating Supply Voltage: 2.7 V to 18 V

Output Type: Rail-to-Rail

Core advantages of the AD8657ARMZ

Firstly, its ultra-wide operating voltage range, supporting 2.7V to 18V single supply or ± 1.35V to ± 9V dual supply, enabling it to adapt to a variety of power supply environments from battery-powered equipment to industrial control systems, etc.; secondly, its extremely low power consumption characteristics, the quiescent power supply current of 18μA typical value, the maximum value does not exceed 22μA, especially suitable for energy-sensitive application scenarios; thirdly, its Precision performance performance, including a maximum input offset voltage as low as 350μV and a maximum input bias current of only 20pA, ensuring the accuracy of signal processing.

AD8657ARMZ Technical Specifications

In terms of power supply characteristics, the AD8657ARMZ demonstrates excellent flexibility:

Single-supply operating range: 2.7V to 18V, covering a wide range of needs from coin cell batteries to industrial power systems

Dual-supply operating range: ±1.35V to ±9V for applications requiring AC signal processing

Quiescent current: 18μA typical, 22μA maximum (at 18V supply), one of the lowest power consumption in its class

Power Supply Rejection Ratio (PSRR): 100dB (typical), effectively suppressing the impact of power supply noise on the signal chain.

Precision parameters reflect the core value of the AD8657ARMZ as a precision amplifier:

Input offset voltage: 350μV maximum, 65μV typical, ensuring accuracy in high-precision measurement applications.

Input bias current: 20pA max, 1pA typical, virtually no loading effect on high impedance sensor signals

Input offset current: 20pA maximum, 0.5pA typical

Long-term offset voltage stability: 0.5μV/month (typical), ensuring long-term reliability of the system after calibration.

Dynamic performance parameters demonstrate the device's capability in signal processing:

Gain Bandwidth Product (GBW): 230kHz (typical at AV=100)

Unit gain bandwidth: 230kHz (typical)

-3dB closed-loop bandwidth: 305kHz (typical)

Slew Rate: 0.15V/μs (typical)

Build-up time (0.1%): 8μs (typical, 2V step)

Noise characteristics are especially critical for precision applications:

Voltage noise density: 45nV/√Hz (at 1kHz)

Current noise density: 0.5fA/√Hz (at 1kHz)

Total Harmonic Distortion plus Noise (THD+N): 0.0006% (at 1kHz, AV=1, VOUT=2VRMS)1

The input/output characteristics demonstrate the device's interface capabilities:

Input common-mode voltage range: rail-to-rail (VEE-0.3V to VCC+0.3V)

Output swing: rail-to-rail (only 50mV from supply rails at 10kΩ load)

Short-circuit current: 25mA (typical)

Typical Application Scenarios for the AD8657ARMZ

Portable operating systems are one of the ideal application areas for the AD8657ARMZ. In battery-powered portable devices, low power consumption is a key factor in extending battery life, and the AD8657ARMZ's maximum quiescent current of only 22μA makes it perfect for applications such as medical monitoring devices, handheld test instruments and portable data loggers. Its wide supply voltage range allows the device to operate even when the battery voltage drops, while the rail-to-rail input-output feature makes maximum use of the limited supply voltage range.

The AD8657ARMZ's low dropout voltage and high common-mode rejection ratio (CMRR) characteristics play an important role in current monitoring systems. In industrial and automotive applications, it is often necessary to monitor the current in motor windings or power devices, where large common-mode voltages are often present. the AD8657ARMZ is able to accurately amplify small voltage signals across shunt resistors while suppressing common-mode voltages as high as 18V, providing reliable data for overcurrent protection and efficiency optimisation.

The 4mA to 20mA loop driver is a standard interface for process control systems and the AD8657ARMZ excels in such applications. Its wide supply voltage range allows it to be powered directly from the loop, while the micro-power feature minimises the loop driver's own power consumption, making more power available for signal transmission. Precision features ensure that signal accuracy is maintained over long transmission distances.

Sensor signal conditioning is another important application area for the AD8657ARMZ. Whether it is temperature sensors (e.g. thermocouples, RTDs), pressure sensors or strain gages, their output signals are usually very small and accompanied by a large common-mode voltage. the high input impedance, low noise and low out-of-phase voltage of the AD8657ARMZ enable it to accurately amplify these weak signals, while the EMI resistance ensures stable operation in industrial environments.

The stability and low noise characteristics of the AD8657ARMZ are particularly valuable in multi-pole filter designs. In applications requiring multi-stage filtering, such as bioelectric signal detection or vibration analysis, multiple AD8657ARMZs can be cascaded to form a high-order filter with consistent performance parameters that simplify design and improve overall system performance.

In remote/wireless sensor nodes, the micro-power consumption of the AD8657ARMZ extends the life of the battery or energy harvesting system. In environmental monitoring, agricultural IoT or industrial wireless sensor networks, the AD8657ARMZ can operate for extended periods of time with little impact on the system power budget, while its precision features ensure the accuracy of sensed data.

In low-power transconductance amplifier applications, the AD8657ARMZ converts voltage signals to current signals for driving LEDs or other current-sensitive devices. Its accurate conversion ratio and low power consumption characteristics make it ideal for photodetection and biomedical applications.