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Analog Devices Inc. AD8218BRMZ-R7
- Part No.:
- AD8218BRMZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Current Regulation/Management
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8218BRMZ-R7.pdf
- Description:
- IC CURRENT MONITOR 0.35% 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,215
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Product details
Overview
AD8218BRMZ-R7 from Analog Devices is a zero-drift, bidirectional current shunt monitor IC designed for high-side current sensing in 4 V to 80 V systems. It delivers 20 V/V fixed gain, ±50 µV typical input offset voltage, ±100 nV/°C offset drift, and 110 dB typical CMRR at dc - enabling precision measurement of differential voltages up to 250 mV across shunt resistors in telecom power management and motor control.
For engineers reviewing the AD8218BRMZ-R7 datasheet, AD8218BRMZ-R7 pinout, AD8218BRMZ-R7 application, or AD8218BRMZ-R7 equivalent, this device supports unidirectional (via ENB-grounded internal 80 mV reference) and bidirectional (via external REF voltage) sensing, with MSOP-8 packaging, rail-to-rail output swing, and survival capability up to −0.3 V to +85 V common-mode voltage.
Technical Context
The AD8218BRMZ-R7 implements a precision difference amplifier core with matched 1.5 MΩ/75 kΩ resistor network yielding exact 20 V/V gain, and integrates an internal LDO allowing VS pin to float when powered from the common-mode voltage (4 V–80 V). Its zero-drift architecture maintains ±100 nV/°C offset drift across −40°C to +125°C.
Output clamping limits maximum output to 5.2 V to protect downstream ADCs; the internal 80 mV reference (enabled by grounding ENB) sets baseline output for unidirectional sensing, while external low-impedance voltage applied to REF enables bidirectional operation with 1 V/V gain from REF to OUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V fixed - eliminates gain calibration; ±0.35% max error over −40°C to +125°C ensures stable scaling for shunt-based current calculation. |
| Input Offset Voltage | ±50 µV typical - enables accurate detection of sub-2.5 mV differential inputs (e.g., 125 A through 20 mΩ shunt). |
| Offset Drift | ±100 nV/°C typical - maintains <±300 µV total offset variation across full temperature range, critical for battery management accuracy. |
| Common-Mode Range | 4 V to 80 V operating - supports direct connection to 48 V telecom buses and industrial 24–72 V rails without level-shifting. |
| CMRR | 110 dB typical at dc - rejects noise from high-voltage switching nodes, preserving signal integrity in motor drive half-bridges. |
| Differential Input Range | 0 mV to 250 mV - defines usable shunt voltage window before output clamping; corresponds to 12.5 A max with 20 mΩ shunt. |
| Bandwidth | 450 kHz small-signal −3 dB - resolves fast current transients in PWM-driven motor phases or DC-DC converter load steps. |
Pinout & Package
AD8218BRMZ-R7 is packaged in an 8-lead MSOP (RM-8) 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 performance.
| 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 | May float (powered via +IN) for high-voltage operation, or accept 4–5.5 V regulated supply for noise-sensitive environments. |
| ENB (Pin 3) | Enable control | Grounding enables internal 80 mV reference - sets output baseline for unidirectional sensing; open or high-Z disables reference. |
| GND (Pin 4) | Ground reference | Return path for internal LDO, amplifier core, and exposed pad; must be low-impedance connection. |
| OUT (Pin 5) | Analog output | Buffered, rail-to-rail voltage output (0.01 V to VS − 0.1 V); drives 25 kΩ loads directly into ADC inputs. |
| NC (Pin 6) | No connect | Internally unconnected; must remain unpopulated and untraced on PCB. |
| REF (Pin 7) | Reference input | Accepts low-impedance external voltage (0–5 V); 1 V/V gain to OUT enables bidirectional current mapping around that offset. |
| −IN (Pin 8) | Inverting input | Connects to low-side of shunt; completes differential pair with +IN for common-mode rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift amplifier core | ±100 nV/°C offset drift ensures <±0.3 mV total offset error over −40°C to +125°C - eliminates recalibration in automotive under-hood modules. |
| Internal 80 mV reference | Enabled by grounding ENB; provides known output baseline for unidirectional sensing - avoids ADC zero-scale errors and improves dynamic range utilization. |
| High common-mode survival | −0.3 V to +85 V absolute max rating - withstands load-dump transients and reverse-battery conditions in 48 V telecom and base station power supplies. |
| Output clamping at 5.2 V | Prevents ADC overvoltage damage during differential overload or startup surge - no external zener or clamp required for standard 5 V ADC interfaces. |
| MSOP-8 package with exposed pad | 3.0 mm × 3.0 mm footprint with thermal pad - enables compact placement near high-current shunts while maintaining 125°C junction temperature capability. |
Applications
| 48 V Telecom Power Management | Bidirectional Motor Control |
|---|---|
Use Scenario: Monitoring charge/discharge current in 48 V distributed power architecture (DPA) shelves with hot-swap controllers and OR-ing FETs. IC Role / Device Role / Timing Role: High-side current shunt monitor providing isolated, ground-referenced analog output proportional to bus current magnitude and direction. Use Value: Enables real-time power budgeting and fault detection (e.g., short-circuit, reverse current) without breaking ground loops or adding isolation components. |
Use Scenario: Sensing phase current in BLDC motor drives where current flows bidirectionally during regeneration and motoring cycles. IC Role / Device Role / Timing Role: Bidirectional current sensor using external 2.5 V REF to center output at mid-scale for ±250 mV differential input range. Use Value: Delivers 450 kHz bandwidth and <1 µs overload recovery - captures rapid current reversals during PWM commutation without distortion. |
| Precision High-Voltage Current Sources | Battery Management Systems (BMS) |
Use Scenario: Closed-loop regulation of high-stability current sources for optical transceivers or RF power amplifiers in base stations. IC Role / Device Role / Timing Role: Shunt-based feedback element converting load current to precise 20× amplified voltage for DAC-controlled op-amp loop compensation. Use Value: ±5 ppm/°C gain drift and ±100 nV/°C offset drift maintain <0.01% current accuracy across environmental stress, critical for Class A amplifier bias stability. |
Use Scenario: Cell-level or pack-level current monitoring in EV/HEV traction battery packs operating at 40–80 V nominal. IC Role / Device Role / Timing Role: High-side monitor interfacing to isolated sigma-delta ADC, leveraging ENB-enabled 80 mV reference for unidirectional discharge-only measurement. Use Value: 110 dB CMRR rejects common-mode noise from high di/dt switching events in adjacent inverters, ensuring Coulomb counting accuracy within ±0.5%. |
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, −5 V to 85 V common-mode, 120 dB CMRR, but requires external 5 V supply; no internal reference. | Automotive AEC-Q100 qualified; better CMRR but lacks ENB-enabled 80 mV reference for unidirectional baseline setting. | Choose for automotive-grade designs needing higher CMRR and qualification; avoid if floating VS or internal reference simplification is required. |
| MAX40056ATA+T | 20 V/V gain, 4 V to 76 V common-mode, ±150 µV offset, no internal reference, 2.7 V to 5.5 V supply only. | Smaller 6-pin WLP package; lower quiescent current (350 µA) but no ENB function or LDO - mandates external supply and REF circuitry. | Choose for space-constrained portable equipment; avoid for high-voltage floating-supply applications or where internal reference reduces BOM count. |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, AD8218BRMZ-R7 uniquely combines floating VS operation, ENB-enabled 80 mV reference, and MSOP-8 thermal performance - reducing system-level design complexity in telecom and industrial 48 V platforms without sacrificing accuracy or ruggedness.
Availability
AD8218BRMZ-R7 is available at Aetrix Electronics and suitable for 48 V telecom power management, bidirectional motor control, precision high-voltage current sources, battery management systems, and base station power amplifier bias control requiring stable component supply across extended temperature and voltage ranges.
Supply support for AD8218BRMZ-R7 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, with design and manufacturing expertise spanning precision instrumentation, power management, and signal conditioning.
The AD8218BRMZ-R7 belongs to Analog Devices' precision current sense amplifier product line, engineered specifically for high-common-mode, zero-drift current monitoring in industrial, telecom, and motor control systems demanding accuracy across wide temperature and voltage ranges.
FAQ
What is the supply configuration flexibility of the AD8218BRMZ-R7?
The AD8218BRMZ-R7 supports two supply modes: VS pin can be left floating to draw power directly from the +IN common-mode voltage (4 V–80 V), eliminating need for auxiliary supply; alternatively, a clean 4–5.5 V supply may be applied to VS for improved noise immunity in electrically noisy environments. Both configurations are fully supported per datasheet specifications.
How does the ENB pin affect the transfer function of the AD8218BRMZ-R7?
When ENB is grounded, the AD8218BRMZ-R7 activates its internal 80 mV reference, shifting the output transfer function to OUT = (20 × VIN) + 0.08 V - establishing a known baseline for unidirectional current sensing. If ENB is open or high, the internal reference is disabled and OUT = 20 × VIN, requiring external REF voltage for offset control in bidirectional applications.
What is the maximum differential input voltage the AD8218BRMZ-R7 can accurately amplify?
The AD8218BRMZ-R7 is specified for accurate amplification across a differential input voltage range of 0 mV to 250 mV. Beyond 250 mV, output clamping limits voltage to ~5.2 V to protect downstream converters; while the device survives ±5 V differential input, linear amplification is guaranteed only up to 250 mV per Table 1 and Figure 8.
Can the AD8218BRMZ-R7 be used for bidirectional current sensing without external components?
No - bidirectional operation requires an external low-impedance voltage source (e.g., precision DAC or buffered reference) connected to the REF pin (Pin 7). The AD8218BRMZ-R7 provides 1 V/V gain from REF to OUT, enabling centered output (e.g., 2.5 V at zero current), but REF must be actively driven; no internal circuitry generates this voltage without external support.
What thermal considerations apply to the AD8218BRMZ-R7 in continuous operation?
The AD8218BRMZ-R7 in MSOP-8 package features an exposed pad that must be soldered to a PCB ground plane for effective heat dissipation. With 800 µA quiescent current and typical power dissipation below 10 mW, it sustains full −40°C to +125°C operation when mounted on ≥1 cm² copper area; thermal resistance θJA is 120°C/W per package data.
AD8218BRMZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-MSOP
AD8218BRMZ-R7 FAQ
1.How can I place an order for AD8218BRMZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8218BRMZ-R7 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 AD8218BRMZ-R7 reliable?
The price and inventory of AD8218BRMZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8218BRMZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8218BRMZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8218BRMZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8218BRMZ-R7?
AD8218BRMZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8218BRMZ-R7 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 AD8218BRMZ-R7?
For technical support, including AD8218BRMZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8218BRMZ-R7 requirements.
6.How does Aetrix verify that AD8218BRMZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8218BRMZ-R7 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 AD8218BRMZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8218BRMZ-R7?
All AD8218BRMZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8218BRMZ-R7, 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 AD8218BRMZ-R7 part is unused and in its original packaging.
Return procedure for AD8218BRMZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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