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Analog Devices Inc. AD8237ARMZ-RL
- Part No.:
- AD8237ARMZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8237ARMZ-RL.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,680
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Product details
Overview
AD8237ARMZ-RL from Analog Devices is a micropower, zero-drift instrumentation amplifier with true rail-to-rail input and output operation, 115 µA quiescent current, 0.3 µV/°C max offset drift, and 106 dB minimum CMRR at DC. It serves as a precision front-end gain stage for low-level differential signals in battery-powered medical and industrial sensor systems.
For engineers reviewing the AD8237ARMZ-RL datasheet, AD8237ARMZ-RL pinout, AD8237ARMZ-RL application, or AD8237ARMZ-RL equivalent, key selection criteria include its indirect current feedback architecture enabling rail-to-rail common-mode input beyond supplies, bandwidth mode pin (BW) for dynamic compensation control, and guaranteed 1 nA input bias current up to +125°C.
Technical Context
The AD8237ARMZ-RL uses an indirect current feedback topology with two matched transconductance amplifiers (gm1, gm2) and a transimpedance amplifier (TIA), enabling true rail-to-rail input operation even when common-mode voltage exceeds supply rails. Its adaptive level shift (ALS) technique preserves differential signal integrity while shifting common-mode level for optimal internal amplifier biasing.
Gain is set externally via two resistors (G = 1 + R₂/R₁), supporting 1–1000 V/V range with 0.005% max gain error and 0.5 ppm/°C max gain drift. The BW pin selects between low-bandwidth mode (200 kHz G=1) and high-bandwidth mode (100 kHz G=10), directly altering compensation without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8 V to 5.5 V single supply - enables direct interface with Li-ion, coin-cell, and low-voltage microcontrollers. |
| Quiescent Current | 115 µA typical - supports >1-year battery life in portable ECG or pressure monitors with 200 mAh cells. |
| Input Offset Drift | 0.3 µV/°C max - ensures stable baseline in thermocouple interfaces across −40°C to +125°C industrial environments. |
| CMRR | 106 dB min at DC (G=1) - rejects power-line interference in bridge-based strain gauge measurements. |
| Bandwidth Modes | Pin-selectable: low mode (200 kHz G=1) or high mode (100 kHz G=10) - balances noise vs. speed without layout changes. |
| ESD Rating | 8 kV HBM - withstands handling and board-level ESD events in production and field service. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive sensors and industrial motor control feedback loops. |
Pinout & Package
AD8237ARMZ-RL is housed in an 8-lead MSOP package (3 mm × 3 mm, 0.65 mm pitch), optimized for space-constrained PCB layouts in portable medical devices and IoT edge nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BW | Bandwidth Mode Control | Connect to −VS for low-bandwidth mode (reduced noise, higher PSRR); connect to +VS for high-bandwidth mode (faster settling, wider small-signal bandwidth). |
| +IN | Differential Input Positive | High-impedance (800 MΩ||10 pF) node for bridge top or thermocouple hot junction; accepts inputs down to −VS − 0.2 V. |
| −IN | Differential Input Negative | Matches +IN impedance and voltage range; enables true rail-to-rail common-mode operation up to ±3.85 V differential swing. |
| −VS | Negative Supply Rail | Ground reference for single-supply operation; also used as return path for BW pin in low-bandwidth configuration. |
| VOUT | Amplified Output | Rail-to-rail output (−VS + 0.05 V to +VS − 0.05 V, RL = 10 kΩ) drives ADC inputs or analog filters directly. |
| FB | Feedback Input | Completes gain-setting loop with external R₂; bias current ≤1 nA minimizes gain error from resistor mismatch. |
| REF | Reference Input | Sets output common-mode level (e.g., mid-supply for bipolar ADCs); input bias ≤1 nA avoids REF node loading. |
| +VS | Positive Supply Rail | Accepts 1.8–5.5 V; powers internal ALS, gm stages, and TIA; connects to BW pin in high-bandwidth mode. |
Key Features
| Feature | Design Value |
|---|---|
| Indirect current feedback architecture | Enables true rail-to-rail input common-mode range (beyond supplies), eliminating need for level-shifting circuitry in low-voltage systems. |
| Adaptive level shift (ALS) | Switched-capacitor technique preserves differential signal fidelity while optimizing internal amplifier bias points for zero-drift performance. |
| External gain setting with two resistors | Supports precise, temperature-stable gains from 1 to 1000 without trimming; gain error remains ≤0.005% across full range. |
| On-chip RFI filter | 6 MHz cutoff suppresses GSM, Wi-Fi, and switching regulator noise before amplification, reducing post-processing filtering requirements. |
| Guaranteed 1 nA input bias current | Validated over −40°C to +125°C - ensures predictable gain accuracy in high-impedance thermocouple or pH probe interfaces. |
Applications
| Bridge amplification | Medical instrumentation |
|---|---|
Use Scenario: Amplifying mV-level outputs from load cells, strain gauges, or pressure transducers in industrial weighing systems. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing programmable gain, rail-to-rail input to handle sensor offset, and low drift for long-term calibration stability. Use Value: 106 dB CMRR rejects common-mode noise from 4–20 mA loop interference; 0.3 µV/°C drift limits calibration drift to <1 µV over 50°C ambient shift. | Use Scenario: Front-end signal conditioning in portable ECG monitors measuring sub-mV cardiac potentials. IC Role / Device Role / Timing Role: Low-noise, micropower in-amp with true rail-to-rail input to capture full ECG waveform without clipping near supply rails. Use Value: 115 µA supply current extends battery life; on-chip RFI filter attenuates 900 MHz cellular noise, reducing need for external shielding. |
| Thermocouple interface | Current measurement |
Use Scenario: Cold-junction compensation and amplification of Type-K thermocouple outputs (≈41 µV/°C) in furnace controllers. IC Role / Device Role / Timing Role: Zero-drift amplifier rejecting thermocouple lead resistance errors and maintaining accuracy over wide temperature gradients. Use Value: 0.3 µV/°C offset drift corresponds to <0.007°C error per °C ambient change - critical for ±0.5°C system accuracy. | Use Scenario: High-side or low-side current sensing in battery management systems using shunt resistors (10–100 mΩ). IC Role / Device Role / Timing Role: Rail-to-rail input allows direct measurement of shunt voltage referenced to battery rail or ground, independent of common-mode voltage. Use Value: Input common-mode range extends to −VS − 0.2 V and +VS + 0.2 V - enables accurate sensing even during deep discharge (<2.0 V) or charging transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8235ARMZ-R7 | Lower quiescent current (85 µA), no BW pin, fixed low-bandwidth mode only (150 kHz G=1), same 8-lead MSOP package. | Better suited for ultra-low-power wearable biosensors where bandwidth >100 kHz is unnecessary. | Select AD8235ARMZ-R7 when minimizing average current is critical and bandwidth flexibility is not required. |
| INA333AIDRGT | Higher quiescent current (50 µA), integrated gain resistors (G=1–1000), no BW pin, 8-pin VSSOP package (same footprint as MSOP). | Preferred for rapid prototyping and cost-sensitive consumer devices where external resistor count must be minimized. | Select INA333AIDRGT when board space is constrained and design schedule favors integrated gain over external tuning flexibility. |
Compared with AD8235ARMZ-R7 and INA333AIDRGT, the AD8237ARMZ-RL uniquely provides pin-selectable bandwidth modes and guaranteed 1 nA input bias current over full temperature range - making it optimal for high-precision, field-deployed industrial sensors requiring both flexibility and long-term stability.
Availability
AD8237ARMZ-RL is available at Aetrix Electronics and suitable for bridge amplification, medical instrumentation, thermocouple interface, and current measurement applications requiring stable component supply, extended temperature operation, and low-power precision analog signal conditioning.
Supply support for AD8237ARMZ-RL 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.
The AD8237ARMZ-RL belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-power, zero-drift signal conditioning in battery-operated and harsh-environment sensor systems.
FAQ
What is the maximum gain achievable with the AD8237ARMZ-RL?
The AD8237ARMZ-RL is characterized for gains from 1 to 1000 V/V using two external resistors (G = 1 + R₂/R₁). While higher gains are possible, Analog Devices specifies performance only up to G = 1000 - including 0.005% max gain error, 0.5 ppm/°C gain drift, and validated bandwidth response. For G > 1000, external resistor tolerance and FB pin bias current effects dominate accuracy.
How does the BW pin affect the AD8237ARMZ-RL's small-signal bandwidth?
The BW pin selects compensation: tied to −VS enables low-bandwidth mode (200 kHz at G = 1, 2 kHz at G = 100); tied to +VS enables high-bandwidth mode (100 kHz at G = 10, 1 kHz at G = 1000). This pin alters internal capacitor values - no external components needed. Bandwidth scales inversely with gain in both modes, per datasheet Table 2.
Can the AD8237ARMZ-RL operate with a 1.8 V supply?
Yes, the AD8237ARMZ-RL is fully specified for 1.8 V single-supply operation, delivering rail-to-rail input/output swing, 115 µA quiescent current, and 100 dB CMRR at DC (G = 1). Input common-mode range extends from −VS − 0.2 V to +VS + 0.2 V, enabling direct interface with low-voltage microcontrollers and energy-harvesting systems.
What is the purpose of the REF and FB pins on the AD8237ARMZ-RL?
The REF pin sets the output common-mode voltage (e.g., 0.9 V for 1.8 V supply, 2.5 V for 5 V supply), allowing level alignment with downstream ADCs. The FB pin completes the external gain-setting network with R₂; its 1 nA max input bias current ensures minimal gain error contribution from resistor mismatch or leakage paths.
Is the AD8237ARMZ-RL suitable for thermocouple applications requiring cold-junction compensation?
Yes, the AD8237ARMZ-RL is explicitly recommended for thermocouple interfaces due to its 0.3 µV/°C max offset drift, 1 nA input bias current (minimizing voltage drop across high-impedance thermocouple leads), and rail-to-rail input enabling direct connection to thermocouple outputs referenced to system ground or supply rails.
AD8237ARMZ-RL 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
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.15V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 200 kHz
- Current - Input Bias:
- 250 pA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 115µA
- Current - Output / Channel:
- 4 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8237ARMZ-RL FAQ
1.How can I place an order for AD8237ARMZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8237ARMZ-RL 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 AD8237ARMZ-RL reliable?
The price and inventory of AD8237ARMZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8237ARMZ-RL is usually 5 days.
3.What payment methods are accepted for AD8237ARMZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8237ARMZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8237ARMZ-RL?
AD8237ARMZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8237ARMZ-RL 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 AD8237ARMZ-RL?
For technical support, including AD8237ARMZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8237ARMZ-RL requirements.
6.How does Aetrix verify that AD8237ARMZ-RL is sourced from the original manufacturer or authorized distributors?
All AD8237ARMZ-RL 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 AD8237ARMZ-RL meets industry standards.
7.What is the process for return or replacement of AD8237ARMZ-RL?
All AD8237ARMZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD8237ARMZ-RL, 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 AD8237ARMZ-RL part is unused and in its original packaging.
Return procedure for AD8237ARMZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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