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Analog Devices Inc. AD8218BCPZ-WP
- Part No.:
- AD8218BCPZ-WP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Current Regulation/Management
- Package:
- 8-WFDFN Exposed Pad, CSP
- Datasheet:
-
AD8218BCPZ-WP.pdf
- Description:
- IC CURRENT MONITOR 0.35% 8LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:14,929
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Product details
Overview
AD8218BCPZ-WP from Analog Devices is a zero-drift, bidirectional current shunt monitor IC designed for high-side sensing in 4 V to 80 V systems. It delivers 20 V/V fixed gain, ±50 µV typical input offset, ±100 nV/°C offset drift, and 110 dB CMRR at dc - enabling precision current measurement across shunt resistors in telecom power supplies and motor control circuits.
For engineers reviewing the AD8218BCPZ-WP datasheet, AD8218BCPZ-WP pinout, AD8218BCPZ-WP application, or AD8218BCPZ-WP equivalent, this device supports unidirectional (via ENB-grounded internal 80 mV reference) and bidirectional (via external REF voltage) sensing with output clamping at 5.2 V and guaranteed operation from −40°C to +125°C.
Technical Context
The AD8218BCPZ-WP uses a zero-drift amplifier core with matched thin-film resistors (R4/R1 = 20 V/V) to achieve ±0.35% total gain error over temperature and ±300 µV offset over −40°C to +125°C. Its LDO-based architecture allows VS pin floating when powered from common-mode voltage (4 V–80 V), eliminating need for auxiliary supply in high-voltage rails.
It features dual operating modes: unidirectional mode (ENB = GND, 80 mV offset added to output) and bidirectional mode (REF pin driven externally, 1 V/V gain from REF to OUT). Output clamping limits swing to 0.01 V to VS − 0.1 V, protecting downstream ADCs while maintaining linearity up to 250 mV differential input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V fixed, ±0.35% max error over −40°C to +125°C - ensures stable scaling without calibration. |
| Input Offset Voltage | ±50 µV typical at 25°C, ±300 µV max over full temperature range - enables accurate low-current detection. |
| Offset Drift | ±100 nV/°C typical - maintains sub-µV drift performance across automotive and industrial thermal cycles. |
| CMRR | 110 dB typical at dc, 90 dB min over temperature - rejects high common-mode noise in 48 V telecom or battery systems. |
| Differential Input Range | 0 mV to 250 mV - maps to 0 A–12.5 A on 20 mΩ shunt, with output clamped to prevent ADC saturation. |
| Common-Mode Range | 4 V to 80 V operating, −0.3 V to +85 V survival - supports direct connection to 48 V/60 V bus rails without level-shifting. |
| Bandwidth | 450 kHz small-signal −3 dB - captures fast transients in motor phase current or power converter load steps. |
Pinout & Package
AD8218BCPZ-WP is packaged in an 8-lead LFCSP_WD (CP-8-4), 2 mm × 3 mm, very thin dual-lead package with exposed pad connected to GND. Pin 6 is NC (no connect); exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 1) | Noninverting input | Connects to high-side of shunt; carries 130–220 µA bias current dependent on common-mode voltage. |
| VS (Pin 2) | Supply input | Can float (powered via +IN) for 4 V–80 V operation, or accept 4 V–5.5 V standalone supply - enables flexible rail integration. |
| ENB (Pin 3) | Enable control | Grounding enables internal 80 mV reference for unidirectional sensing; open or high disables reference. |
| GND (Pin 4) | Ground reference | Reference node for output and internal LDO; exposed pad must connect here for thermal stability. |
| OUT (Pin 5) | Buffered output | Drives 25 kΩ load; swings 0.01 V to VS − 0.1 V; clamped at 5.2 V to protect ADC inputs. |
| NC (Pin 6) | No connect | Not internally bonded - must remain unconnected per datasheet. |
| REF (Pin 7) | Reference input | Accepts 0–5 V low-impedance source; 1 V/V gain to OUT - sets zero-current output level for bidirectional sensing. |
| −IN (Pin 8) | Inverting input | Connects to low-side of shunt; completes differential pair with +IN for current-derived voltage amplification. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift amplifier core | ±100 nV/°C offset drift ensures <1 µV total drift over 100°C span - critical for battery SOC accuracy. |
| Internal 80 mV reference | Enabled by grounding ENB; provides known output baseline for unidirectional sensing - eliminates negative output swing. |
| Output clamping | Hard limit at 5.2 V prevents ADC overvoltage damage during overload or startup - no external protection needed. |
| High common-mode rejection | 110 dB CMRR at dc rejects noise from switching regulators or motor commutation spikes in shared ground systems. |
| LDO-powered architecture | VS pin optional - simplifies layout in 48 V telecom or base station power supplies where auxiliary 5 V may be unavailable. |
Applications
| 48 V Telecom Power Monitoring | Bidirectional Motor Control |
|---|---|
Use Scenario: Real-time current monitoring of 48 V DC distribution rails in telecom base stations to detect overloads and aging effects. IC Role / Device Role / Timing Role: High-side current shunt monitor converting mV-level shunt voltage to ground-referenced analog output for ADC sampling. Use Value: 80 V common-mode rating and 450 kHz bandwidth capture transient faults; ±50 µV offset enables detection of <2.5 A on 20 mΩ shunt. |
Use Scenario: Phase current sensing in H-bridge motor drivers for field-oriented control (FOC) in industrial actuators. IC Role / Device Role / Timing Role: Bidirectional current amplifier using external 2.5 V REF to center output at mid-rail for positive/negative current polarity. Use Value: 250 mV differential input range maps to ±12.5 A on 20 mΩ shunt; zero-drift core maintains accuracy across motor thermal cycling. |
| Precision Battery Management | Base Station Power Amplifier Bias Control |
Use Scenario: Coulomb counting and state-of-charge estimation in 48 V lithium-ion battery packs for UPS and energy storage. IC Role / Device Role / Timing Role: Unidirectional current sensor with ENB grounded to set 80 mV zero-current baseline, maximizing dynamic range. Use Value: ±300 µV max offset over temperature ensures <0.1% current measurement error across −40°C to +85°C ambient. |
Use Scenario: Bias current regulation of GaN RF power amplifiers in 5G base stations, requiring stable quiescent current under varying supply conditions. IC Role / Device Role / Timing Role: High-side shunt monitor feeding closed-loop DAC control loop to maintain precise PA bias point. Use Value: 110 dB CMRR suppresses coupling from adjacent RF stages; 4 V–80 V range accommodates variable PA supply rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current shunt monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 20 V/V gain, ±10 µV offset, −40°C to +125°C, SOIC-8 package - lower offset but requires 2.7–5.5 V supply only. | Cannot operate directly from 48 V bus; needs external LDO - adds BOM cost and footprint. | Select when ultra-low offset (<10 µV) is prioritized and auxiliary 5 V supply is available. |
| MAX40056ATA+T | 20 V/V gain, ±150 µV offset, 4.5–76 V common-mode, 800 kHz bandwidth - higher bandwidth but higher drift (±300 nV/°C). | Wider common-mode range suits 72 V EV systems; less stable over temperature than AD8218BCPZ-WP. | Select for faster transient response in EV traction inverters where ±300 nV/°C drift is acceptable. |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, AD8218BCPZ-WP uniquely combines bus-powered operation (no auxiliary supply), ±100 nV/°C drift, and 80 V common-mode tolerance - making it optimal for space-constrained, thermally demanding 48 V telecom and industrial power systems.
Availability
AD8218BCPZ-WP is available at Aetrix Electronics and suitable for 48 V telecom power monitoring, bidirectional motor control, precision battery management, base station power amplifier bias control, and high-side current sensing in industrial embedded systems requiring stable component supply across extended temperature ranges.
Supply support for AD8218BCPZ-WP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, serving industrial, automotive, communications, and healthcare markets.
The AD8218BCPZ-WP belongs to Analog Devices' precision current sense amplifier product line, engineered specifically for high-voltage, high-accuracy shunt-based current measurement in harsh thermal and electrical environments.
FAQ
What is the maximum common-mode voltage the AD8218BCPZ-WP can withstand continuously?
The AD8218BCPZ-WP operates continuously from 4 V to 80 V common-mode input voltage. Its absolute maximum rating extends to −0.3 V to +85 V, allowing brief exposure to transients beyond the operational range without damage. This makes AD8218BCPZ-WP suitable for direct connection to 48 V and 60 V telecom and industrial bus rails.
How does the ENB pin affect the output transfer function of the AD8218BCPZ-WP?
When ENB is grounded, the AD8218BCPZ-WP enables its internal 80 mV reference, shifting the output transfer function to OUT = (20 × VIN) + 0.08 V. This sets a non-zero baseline for unidirectional sensing, improving dynamic range utilization. When ENB is left open or high, the reference is disabled and OUT = 20 × VIN.
Can the AD8218BCPZ-WP be used without connecting the VS pin?
Yes - the AD8218BCPZ-WP integrates an internal LDO that allows the VS pin to float. In this configuration, the device draws power directly from the +IN pin's common-mode voltage (4 V–80 V), eliminating need for an external supply. This simplifies design in high-voltage systems where a clean 5 V rail is unavailable.
What is the purpose of output clamping in the AD8218BCPZ-WP?
The AD8218BCPZ-WP clamps its output at approximately 5.2 V to prevent overvoltage stress on downstream ADC inputs. This occurs because the internal LDO output caps at 5.2 V, limiting the maximum output swing. Clamping ensures robustness during differential overload (±5 V) events while preserving linearity up to 250 mV input.
Does the AD8218BCPZ-WP support bidirectional current sensing, and how is it implemented?
Yes - the AD8218BCPZ-WP supports bidirectional sensing by applying an external voltage (0–5 V) to the REF pin. The REF-to-OUT gain is 1 V/V, so a 2.5 V reference centers the output at 2.5 V for zero differential input. This enables symmetric positive/negative current measurement without polarity reversal circuitry.
AD8218BCPZ-WP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad, CSP
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Current Monitor
- Sensing Method:
- High-Side
- Accuracy:
- ±0.35%
- Voltage - Input:
- 4V ~ 80V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-LFCSP-WD (2x3)
AD8218BCPZ-WP FAQ
1.How can I place an order for AD8218BCPZ-WP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8218BCPZ-WP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD8218BCPZ-WP reliable?
The price and inventory of AD8218BCPZ-WP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8218BCPZ-WP is usually 5 days.
3.What payment methods are accepted for AD8218BCPZ-WP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8218BCPZ-WP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8218BCPZ-WP?
AD8218BCPZ-WP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8218BCPZ-WP order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD8218BCPZ-WP?
For technical support, including AD8218BCPZ-WP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8218BCPZ-WP requirements.
6.How does Aetrix verify that AD8218BCPZ-WP is sourced from the original manufacturer or authorized distributors?
All AD8218BCPZ-WP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD8218BCPZ-WP meets industry standards.
7.What is the process for return or replacement of AD8218BCPZ-WP?
All AD8218BCPZ-WP units undergo pre-shipment inspection (PSI). If there is an issue with AD8218BCPZ-WP, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD8218BCPZ-WP part is unused and in its original packaging.
Return procedure for AD8218BCPZ-WP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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