Overview
The AD8244BRMZ from Analog Devices Inc. is a precision, low-power, FET input, quad unity-gain buffer. This component is designed to isolate very large source impedances from the rest of the signal chain, making it ideal for applications requiring high input impedance and low noise. The AD8244BRMZ operates over a wide supply range, from 3 V to 36 V for single-supply and ±1.5 V to ±18 V for dual-supply configurations, and is specified over the industrial temperature range of −40°C to +85°C. It is available in a compact 10-lead MSOP package, which simplifies board design and reduces board space requirements.
Key Specifications
| Parameter | Typical | Maximum | Unit |
|---|---|---|---|
| Offset Voltage | 100 | 600 | µV |
| Input Bias Current | 0.5 pA | 2 pA | pA |
| Supply Current per Amplifier | 180 | 250 | µA |
| Bandwidth | 3 MHz | MHz | |
| Slew Rate | 0.8 V/µs | V/µs | |
| Power Supply Range (Single Supply) | 3 V to 36 V | V | |
| Power Supply Range (Dual Supply) | ±1.5 V to ±18 V | V | |
| Temperature Range | −40°C to +85°C | °C | |
| Package Type | 10-lead MSOP |
Key Features
- Low power consumption: Maximum supply current of 250 µA per amplifier.
- FET input: Extremely high input impedance and low input bias current of 2 pA maximum at 25°C.
- Low noise: 13 nV/√Hz voltage noise at 1 kHz and 0.4 µV p-p voltage noise (0.1 Hz to 10 Hz).
- High dc precision: 3 µV/°C maximum offset drift.
- Unique pinout: Physically separates high impedance inputs from low impedance supplies and outputs, simplifying guarding and reducing board space.
- Rail-to-rail output: Ensures full output swing regardless of the supply voltage.
- Single-supply operation: Input range extends to ground.
- Wide supply range: Compatible with both single-supply (3 V to 36 V) and dual-supply (±1.5 V to ±18 V) configurations.
Applications
The AD8244BRMZ is versatile and can be used in various applications, including:
- Differential signal chains: Close channel-to-channel matching allows minimal error in differential signal processing.
- High-precision instrumentation: Low noise and high dc precision make it suitable for precision measurement instruments.
- Buffering large source impedances: Ideal for isolating high-impedance sources from the rest of the signal chain.
- General-purpose buffering: Can be used anywhere a unity-gain buffer is needed, especially in low source resistance scenarios.
Q & A
- What is the maximum supply current per amplifier for the AD8244BRMZ?
The maximum supply current per amplifier is 250 µA.
- What is the input bias current of the AD8244BRMZ?
The input bias current is 2 pA maximum at 25°C.
- What is the bandwidth of the AD8244BRMZ?
The bandwidth is 3 MHz.
- What is the slew rate of the AD8244BRMZ?
The slew rate is 0.8 V/µs.
- What are the operating temperature ranges for the AD8244BRMZ?
The specified performance temperature range is −40°C to +85°C.
- What package types are available for the AD8244BRMZ?
The AD8244BRMZ is available in a 10-lead MSOP package.
- What are the key features of the AD8244BRMZ's pinout?
The unique pinout physically separates high impedance inputs from low impedance supplies and outputs, simplifying guarding and reducing board space.
- Can the AD8244BRMZ operate on a single supply or dual supply?
Yes, it can operate on both single-supply (3 V to 36 V) and dual-supply (±1.5 V to ±18 V) configurations.
- What are some common applications for the AD8244BRMZ?
Common applications include differential signal chains, high-precision instrumentation, buffering large source impedances, and general-purpose buffering.
- How does the AD8244BRMZ handle noise?
The AD8244BRMZ has low noise characteristics, with 13 nV/√Hz voltage noise at 1 kHz and 0.4 µV p-p voltage noise (0.1 Hz to 10 Hz).
