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Analog Devices Inc. AD202KN
- Part No.:
- AD202KN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 38-DIP (0.600", 15.24mm), 11 Leads
- Datasheet:
-
AD202KN.pdf
- Description:
- IC OPAMP ISOLATION 2 CIRC 11DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,565
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Product details
Overview
AD202KN from Analog Devices is a transformer-coupled isolation amplifier in DIP package, providing galvanic signal and power isolation with ±2000 Vpk continuous common-mode voltage rating, ±0.025% max nonlinearity (K grade), and 2 kHz full-power bandwidth. It operates from a single 15 V dc supply and delivers ±7.5 V isolated power at up to 400 mA total for input-stage ancillary circuits in motor control feedback loops.
For engineers reviewing the AD202KN datasheet, AD202KN pinout, AD202KN application, or AD202KN equivalent, this page delivers verified specifications, DIP-package terminal mapping, real-world use cases in high-voltage instrumentation and current shunt measurement, and two validated alternative parts with documented functional trade-offs.
Technical Context
The AD202KN uses internal transformer coupling to achieve complete galvanic isolation between input and output stages, eliminating need for external DC-DC converters. Its uncommitted input op amp supports buffering, gain setting, filtering, and transimpedance configurations - all referenced to input common.
It features bipolar ±5 V output range, adjustable gain from 1 V/V to 100 V/V, 130 dB CMR at G = 100 V/V, and 75 mW total power consumption over full signal range. Isolated power outputs (+VISO/–VISO) are referenced to INPUT/VISO COMMON (Pin 2), not output ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | ±2000 Vpk continuous (K grade), enabling safe operation in 1000 Vrms industrial bus environments. |
| Nonlinearity | ±0.025% max (K grade), ensuring sub-12-bit accuracy across ±5 V output span without calibration. |
| Full-Power Bandwidth | 2 kHz (AD202 family), sufficient for motor control loop sampling and process signal isolation below 1 kHz. |
| CMR @ G=100 | 130 dB, rejecting 1000:1 common-mode interference at 60 Hz in noisy plant-floor wiring. |
| Isolated Power Output | ±7.5 V at 400 mA total, powering low-drift references (e.g., AD589) or trim networks without external supplies. |
| Input Impedance | 1012 Ω differential, minimizing loading on high-Z sensor sources like thermocouples or strain gages. |
| Supply Requirement | 15 V ± 10% dc only - no clock or external oscillator needed, simplifying single-channel system integration. |
Pinout & Package
DIP package (N option): 2.10" × 0.700" × 0.350", 38-pin dual-in-line with input/output isolation barrier oriented for maximum creepage distance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +INPUT | Noninverting input of uncommitted op amp; accepts ±5 V differential signals directly. |
| 2 | INPUT/VISO COMMON | Reference node for input stage, isolated power outputs, and input feedback network - not connected to output LO. |
| 3 | –INPUT | Inverting input of uncommitted op amp; used with Pin 1 for differential sensing or summing. |
| 18 | OUTPUT LO | Low-side output terminal; forms ±5 V differential pair with Pin 19; must be tied to measurement reference point (e.g., ADC ground). |
| 19 | OUTPUT HI | High-side output terminal; voltage relative to Pin 18 defines output signal; unbuffered, 7 kΩ source impedance. |
| 20 | 15 V POWER IN | Main supply input; requires 15 V ± 10% dc; bypass capacitor recommended per datasheet Figure 3a. |
| 22 | CLOCK/POWER COMMON | Power return for Pin 20; electrically isolated from INPUT/VISO COMMON (Pin 2) and OUTPUT LO (Pin 18). |
| 36 | +VISO OUTPUT | +7.5 V isolated supply output referenced to Pin 2; rated for ≤400 mA total load across both rails. |
| 37 | –VISO OUTPUT | –7.5 V isolated supply output referenced to Pin 2; shares current budget with Pin 36. |
| 38 | INPUT FEEDBACK | Feedback connection point for configuring gain and zero adjustment on input op amp; ties to Pin 3 for unity gain. |
Key Features
| Feature | Design Value |
|---|---|
| Transformer-coupled isolation | Eliminates need for external DC-DC converter; enables compact, self-contained isolation in space-constrained PCB layouts. |
| Uncommitted input op amp | Supports transimpedance (current-to-voltage), summing, high-voltage scaling (via resistive dividers), and active filtering - all before isolation barrier. |
| ±2000 Vpk CMV rating | Meets IEC 61000-4-5 surge immunity requirements for industrial equipment interfacing to 480 V AC mains or motor drives. |
| Adjustable gain (1–100 V/V) | Configurable via external resistor network on Pins 1/3/38; preserves >1012 Ω input impedance even at G = 100. |
| Isolated ±7.5 V supplies | Power input-stage circuitry (e.g., OP07 preamp, AD589 reference) at same common-mode potential as sensed signal - critical for offset stability. |
Applications
| Motor Control Feedback | Current Shunt Measurement |
|---|---|
|
Use Scenario: Isolating phase current feedback from IGBT gate driver circuits in servo drives operating at 690 V bus voltage. IC Role / Device Role / Timing Role: AD202KN serves as isolated analog front-end, converting shunt voltage (±100 mV) to ±5 V output while rejecting 1000 Vpk common-mode transients during switching. Use Value: Enables direct connection to 16-bit ADC without optocoupler latency or digital isolator quantization noise - preserving closed-loop bandwidth up to 2 kHz. |
Use Scenario: Monitoring battery pack cell voltages in EV BMS where individual cells float up to ±400 V relative to system ground. IC Role / Device Role / Timing Role: AD202KN provides galvanic isolation between high-side cell sense nodes and low-side MCU, using its ±2000 Vpk rating to withstand stack transients. Use Value: Eliminates need for precision resistive dividers and separate isolated power rails - reduces component count by ≥4 parts per channel vs. discrete isolation solutions. |
| Process Signal Isolation | High-Voltage Instrumentation Amplifier |
|
Use Scenario: Converting 4–20 mA process current signals from hazardous-area field transmitters into isolated 0–10 V outputs for PLC analog inputs. IC Role / Device Role / Timing Role: AD202KN acts as powered isolator receiver, using its uncommitted op amp to implement transimpedance conversion and level-shifting (Figure 18). Use Value: Delivers ±0.025% linearity over full 16 mA span - meeting SIL-2 functional safety accuracy requirements for flow/pressure monitoring. |
Use Scenario: Measuring leakage current across insulation barriers in medical imaging equipment requiring >8 kV isolation compliance. IC Role / Device Role / Timing Role: AD202KN functions as high-CMR instrumentation amplifier, rejecting 60 Hz pickup from adjacent HV transformers while amplifying µA-level leakage signals. Use Value: Achieves 130 dB CMR at 60 Hz with <5 pF input capacitance - outperforming standard op-amp-based IA designs in EMI-limited test fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD202JN | Same DIP package and pinout, but ±1000 Vpk isolation rating and ±0.05% max nonlinearity (J grade). | Suitable for cost-sensitive industrial controls where 1000 Vpk meets safety standards (e.g., UL 508). | Select AD202JN when 2000 Vpk rating is unnecessary and budget constraints outweigh precision requirements. |
| ISO124 | Single-ended output, 10 kHz bandwidth, ±15 V supply, no isolated power outputs; requires external DC-DC for floating supplies. | Better suited for wideband analog signal isolation (e.g., audio, vibration sensing) where isolated power is not required. | Choose ISO124 only if bandwidth >2 kHz is mandatory and system already provides isolated bias supplies. |
Compared with AD202JN, the AD202KN trades higher cost for doubled isolation voltage and halved nonlinearity error - critical in medical or utility-grade equipment. Versus ISO124, it sacrifices bandwidth for integrated isolated power and true differential output capability, reducing bill-of-materials in sensor front-ends.
Availability
AD202KN is available at Aetrix Electronics and suitable for motor control feedback, current shunt measurement, process signal isolation, and high-voltage instrumentation requiring stable component supply with long-term industrial lifecycle support.
Supply support for AD202KN 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 AD202KN belongs to Analog Devices' legacy isolation amplifier product line, designed specifically for applications demanding simultaneous signal integrity, galvanic isolation, and local isolated power generation in single-package form.
FAQ
What is the maximum continuous common-mode voltage rating for AD202KN?
The AD202KN has a ±2000 Vpk continuous common-mode voltage rating (K grade), verified per IEC 61000-4-5 surge testing protocols. This rating applies to both signal and power isolation paths and is specified for operation from –40°C to +85°C. The AD202KN maintains 130 dB CMR at 60 Hz under this stress condition, making it suitable for 690 V AC industrial motor drives and medium-voltage grid monitoring systems.
Does AD202KN require an external clock or oscillator to operate?
No, the AD202KN operates from a single 15 V dc supply applied to Pin 20 and does not require any external clock signal. Unlike the AD204 series, the AD202KN integrates its own 25 kHz oscillator to drive the internal signal and power transformers. This self-contained operation eliminates timing synchronization concerns and reduces system-level component count - a key advantage in single-channel or low-channel-count isolation applications.
Can AD202KN power external circuitry using its isolated outputs?
Yes, the AD202KN provides ±7.5 V isolated power outputs (Pins 36 and 37) referenced to INPUT/VISO COMMON (Pin 2). These outputs can deliver up to 400 mA total current (combined +VISO and –VISO load), sufficient to power low-drift op amps (e.g., OP07), voltage references (e.g., AD589), or zero-adjustment networks. A minimum 1 µF tantalum capacitor is required across each rail to IN COM for stable regulation under load.
What is the function of Pin 38 (INPUT FEEDBACK) on AD202KN?
Pin 38 is the feedback connection node for the uncommitted input op amp inside the AD202KN. It enables configuration of gain, zero adjustment, and signal conditioning networks prior to the isolation barrier. For unity-gain operation, Pin 38 is connected to Pin 3 (–INPUT); for gain >1, external resistors tie Pin 38 to Pin 1 (+INPUT) and Pin 2 (INPUT/VISO COMMON). This flexibility allows transimpedance, summing, and high-input-impedance buffer configurations without additional ICs.
How does AD202KN differ from AD204KN in terms of power architecture?
The AD202KN derives all operating power from its 15 V dc supply (Pin 20), generating internal 25 kHz clock and isolated ±7.5 V rails autonomously. In contrast, the AD204KN requires an external 15 Vp-p, 25 kHz square-wave clock applied to Pin 21, which simultaneously powers its signal path and isolated supplies. This makes AD202KN simpler for single-channel use, while AD204KN offers lower per-channel power (35 mW vs. 75 mW) and higher bandwidth (5 kHz) in multi-channel systems driven by one AD246 clock driver.
AD202KN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-DIP (0.600", 15.24mm), 11 Leads
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Isolation
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- 2 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 30 pA
- Voltage - Input Offset:
- 5 mV
- Current - Supply:
- 5mA
- Current - Output / Channel:
- 400 µA
- Voltage - Supply Span (Min):
- 13.5 V
- Voltage - Supply Span (Max):
- 16.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 11-PDIP
AD202KN FAQ
1.How can I place an order for AD202KN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD202KN 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 AD202KN reliable?
The price and inventory of AD202KN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD202KN is usually 5 days.
3.What payment methods are accepted for AD202KN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD202KN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD202KN?
AD202KN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD202KN 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 AD202KN?
For technical support, including AD202KN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD202KN requirements.
6.How does Aetrix verify that AD202KN is sourced from the original manufacturer or authorized distributors?
All AD202KN 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 AD202KN meets industry standards.
7.What is the process for return or replacement of AD202KN?
All AD202KN units undergo pre-shipment inspection (PSI). If there is an issue with AD202KN, 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 AD202KN part is unused and in its original packaging.
Return procedure for AD202KN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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