Analog Devices Inc. AD8212WYRMZ-R7

Overview

AD8212WYRMZ-R7 from Analog Devices is a high common-mode voltage current shunt monitor IC designed for unidirectional high-side current sensing in industrial and automotive power systems. It features 1000 µA/V transconductance, ±2 mV input offset voltage (RTI), 7 V to 65 V supply range (up to >500 V with external PNP), and operates from −40°C to +125°C in an 8-lead MSOP package. It delivers precise current output proportional to shunt voltage for motor control and DC-DC converter monitoring.

For engineers reviewing the AD8212WYRMZ-R7 datasheet, AD8212WYRMZ-R7 pinout, AD8212WYRMZ-R7 application, or AD8212WYRMZ-R7 equivalent, this page provides verified functional specifications, validated pin functions, confirmed high-voltage operation mode requirements, and real-world design implications for shunt-based current measurement circuits.

Technical Context

The AD8212WYRMZ-R7 implements a current-output instrumentation amplifier architecture with integrated 5 V series regulator and patented base-current compensation circuit for external PNP transistor operation. Its differential input stage rejects common-mode voltages up to 65 V natively, and extends beyond 500 V when biased via RBIAS and paired with a high-V_CE PNP transistor connected to ALPHA (Pin 6).

It uses internal feedback through R1/R2 matching to maintain transconductance accuracy despite base current loss in the external PNP. The device's output current (IOUT) is strictly proportional to VSENSE (Pin 8) with gm = 1000 µA/V, and its COM (Pin 2) is regulated at V+ − 5 V - defining the lowest internal reference node and enabling stable operation across wide supply ranges.

Key Specifications

Pinout & Package

AD8212WYRMZ-R7 is housed in an 8-lead MSOP (RM-8) package per JEDEC MO-187-AA, with 0.65 mm pitch and exposed pad not internally connected. Pin 1 identifier located at top-left corner; pins 4 and 7 are no-connect (NC) and must remain unconnected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current sensing applications.

Compared with MAX4080TASA+ and INA240A1QPWRQ1, AD8212WYRMZ-R7 uniquely supports >500 V operation via external PNP while maintaining current-output architecture and integrated compensation - making it the only option among the three for ultra-high common-mode industrial battery or traction applications.

Availability

AD8212WYRMZ-R7 is available at Aetrix Electronics and suitable for motor control, DC-DC converter monitoring, and battery management systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for AD8212WYRMZ-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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD8212WYRMZ-R7 belongs to Analog Devices' precision current sensing portfolio, engineered specifically for robust high-side shunt monitoring in harsh environments where wide common-mode range and temperature stability are critical.

FAQ

What is the maximum common-mode voltage supported by AD8212WYRMZ-R7 without external components?

The AD8212WYRMZ-R7 supports a native common-mode voltage range of 7 V to 65 V. This is the absolute limit for operation without external circuitry. Exceeding 65 V risks permanent damage, as confirmed by Absolute Maximum Ratings (Table 2) and the General Description section. For higher voltages, an external PNP transistor and proper biasing via BIAS and ALPHA pins are required to extend operation beyond 500 V.

Can AD8212WYRMZ-R7 measure bidirectional current?

No, AD8212WYRMZ-R7 is explicitly a unidirectional current sensing device, as stated in the Applications Information section (Page 12). It amplifies only positive differential input voltage (VSENSE > COM). To monitor both charge and discharge currents, two AD8212WYRMZ-R7 devices must be used in complementary configuration - one sensing high-side load current and another sensing low-side charge current - as illustrated in Figure 27.

What is the purpose of the ALPHA pin (Pin 6) on AD8212WYRMZ-R7?

The ALPHA pin (Pin 6) on AD8212WYRMZ-R7 connects to the base of an external PNP transistor in high-voltage operation mode. It feeds the base current into the device's patented output current compensation circuit, which mirrors this current to cancel base-current-induced gain error. This allows use of low-cost, low-beta PNP transistors while maintaining <±1% gain accuracy - a key differentiator versus generic current-output amplifiers.

How does the integrated 5 V regulator affect system design with AD8212WYRMZ-R7?

The integrated 5 V series regulator in AD8212WYRMZ-R7 establishes COM (Pin 2) at V+ − 5 V, defining the internal reference ground. This eliminates need for an external LDO in most applications and simplifies biasing of external components like ROUT or buffer op-amps. However, designers must ensure COM is connected to a low-impedance return path - floating or poorly decoupled COM degrades offset and PSRR performance, as shown in Figure 5 and Figure 20.

What is the recommended ROUT value for 10 V/A gain with AD8212WYRMZ-R7?

For 10 V/A gain, first determine expected shunt voltage: e.g., 100 mΩ shunt × 1 A = 100 mV VSENSE. Since AD8212WYRMZ-R7 has gm = 1000 µA/V, IOUT = 1000 µA/V × 0.1 V = 100 µA. To achieve 10 V output, ROUT = 10 V / 100 µA = 100 kΩ. This matches Table 4's "Gain (V/V)" row for 100×, confirming 100 kΩ as the correct value - not 10 kΩ (which yields 1 V/A).