Overview
The AD8218BCPZ-RL, produced by Analog Devices Inc., is a high voltage, high resolution current shunt amplifier. It is designed for bidirectional current measurements across a shunt resistor and features a set gain of 20 V/V. This device is particularly useful in various industrial and telecom applications due to its excellent input common-mode rejection and wide operating temperature range of −40°C to +125°C. The AD8218BCPZ-RL offers breakthrough performance with a zero-drift core, ensuring high accuracy and stability over the entire temperature range.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| GAIN | - | 20 V/V | - | - | Accuracy ±0.1%, VO ≥ 0.1 V dc, TA |
| GAIN Accuracy over Temperature | - | - | ±0.35% | - | TOPR |
| GAIN vs. Temperature | - | - | ±5 ppm/°C | - | TOPR |
| VOLTAGE OFFSET | - | ±200 µV | ±300 µV | - | 25°C, Over Temperature (RTI1) |
| OFFSET DRIFT | - | ±100 nV/°C | - | - | TOPR |
| INPUT BIAS CURRENT | 130 µA | - | 220 µA | - | TA, input common mode = 4 V, VS = 4 V |
| COMMON-MODE INPUT VOLTAGE RANGE | 4 V | - | 80 V | - | Common-mode continuous |
| DIFFERENTIAL INPUT VOLTAGE RANGE | 0 mV | - | 250 mV | - | Differential input voltage |
| VS RANGE | 4 V | - | 5.5 V | - | VS must be less than 5.5 V if standalone supply is used |
| QUIESCENT CURRENT OVER TEMPERATURE | - | 800 µA | - | - | Throughout input common mode |
| POWER SUPPLY REJECTION RATIO (PSRR) | 90 dB | - | 110 dB | - | TOPR |
| TEMPERATURE RANGE FOR SPECIFIED PERFORMANCE | −40°C | - | +125°C | - | - |
Key Features
- High common-mode voltage range: 4 V to 80 V operating, −0.3 V to +85 V survival
- Buffered output voltage with a gain of 20 V/V
- Wide operating temperature range: −40°C to +125°C
- Excellent ac and dc performance: ±100 nV/°C typical offset drift, ±50 µV typical offset
- ±5 ppm/°C typical gain drift and 110 dB typical CMRR at dc
- Bidirectional current measurements across a shunt resistor
- Zero-drift core for high accuracy and stability
- Internal output clamping to prevent damage to typical ADC inputs
Applications
- High-side current sensing in 48 V telecom systems
- Power management in base stations
- Bidirectional motor control
- Precision high voltage current sources
- Battery management systems
- Base station power amplifier bias control
Q & A
- What is the gain of the AD8218BCPZ-RL?
The AD8218BCPZ-RL has a fixed gain of 20 V/V.
- What is the operating temperature range of the AD8218BCPZ-RL?
The operating temperature range is −40°C to +125°C.
- What is the common-mode input voltage range of the AD8218BCPZ-RL?
The common-mode input voltage range is 4 V to 80 V.
- What is the differential input voltage range of the AD8218BCPZ-RL?
The differential input voltage range is 0 mV to 250 mV.
- What is the quiescent current of the AD8218BCPZ-RL over temperature?
The quiescent current is 800 µA throughout the input common mode.
- What is the power supply rejection ratio (PSRR) of the AD8218BCPZ-RL?
The PSRR is between 90 dB and 110 dB.
- What are some typical applications of the AD8218BCPZ-RL?
Typical applications include high-side current sensing, power management in base stations, bidirectional motor control, and precision high voltage current sources.
- Does the AD8218BCPZ-RL support bidirectional current measurements?
Yes, it supports bidirectional current measurements across a shunt resistor.
- What is the offset drift of the AD8218BCPZ-RL?
The offset drift is ±100 nV/°C.
- Is the AD8218BCPZ-RL RoHS compliant?
Yes, the AD8218BCPZ-RL is RoHS compliant.
