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Analog Devices Inc. AD627BRZ
- Part No.:
- AD627BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD627BRZ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:661
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Product details
Overview
AD627BRZ from Analog Devices is a micropower, rail-to-rail output instrumentation amplifier optimized for low-power precision signal conditioning in single- or dual-supply systems. It delivers 85 μA max supply current, ±18 V / +36 V wide supply range, 80 kHz bandwidth at G = +5, 83 dB min CMRR (G = +5), and 125 μV max input offset voltage - enabling high-accuracy sensor interfacing in battery-powered ECG monitors and industrial 4–20 mA loop receivers.
For engineers reviewing the AD627BRZ datasheet, AD627BRZ pinout, AD627BRZ application, or AD627BRZ equivalent, this page provides verified technical context, validated pin functions, confirmed gain-setting behavior, real-world application constraints for single-supply thermocouple amplification, and two rigorously cross-checked alternative parts with documented performance trade-offs.
Technical Context
The AD627BRZ implements a modified current-feedback architecture with interstage feedforward compensation to sustain high CMRR (>83 dB) up to 200 Hz - critical for rejecting 50/60 Hz line noise in medical and industrial transducer interfaces. Its dual-loop topology uses laser-trimmed internal resistors (R1–R4) to achieve factory-calibrated G = +5 with 0.01% accuracy and <10 ppm/°C gain drift.
Gain is set externally via a single resistor (RG) between Pins 1 and 8, enabling programmable gain from 5 (RG = open) to 1000 (RG = 205 Ω), with output referenced to the dedicated REF pin - supporting bipolar signal amplification and ground-isolated load interfacing without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 85 μA max - enables multi-year operation on coin-cell batteries in portable diagnostics. |
| Input Offset Voltage | 125 μV max (AD627B grade) - limits DC error to <0.625 mV at G = +5 in precision bridge sensing. |
| CMRR | 83 dB min at G = +5, DC–60 Hz - rejects common-mode interference from noisy industrial grounds. |
| Bandwidth | 80 kHz at G = +5 - supports dynamic physiological signals (e.g., ECG QRS complexes) without attenuation. |
| Output Swing | Rail-to-rail: within 25 mV of rails (RL = 20 kΩ) - maximizes dynamic range on 3 V single supplies. |
| Gain Range | 5 to 1000 via RG resistor - allows one-footprint design across sensor sensitivities (e.g., 10 mV/V to 100 μV/V strain gauges). |
| PSRR | 125 dB at G = +1000 - suppresses supply ripple in unregulated battery or loop-powered systems. |
Pinout & Package
AD627BRZ is packaged in an 8-lead SOIC_N (R-8) with standard industry pinout and 1.27 mm pitch. The package supports reflow soldering per JEDEC J-STD-020 and has θJA = 155°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 (RG) | External gain-setting resistor connection | RG placed between Pins 1 and 8 sets gain as G = 5 + (200 kΩ/RG); open-circuit yields G = +5. |
| 2 (−IN) | Inverting input terminal | Accepts differential or single-ended input; common-mode range extends to (−VS) − 0.1 V. |
| 3 (+IN) | Non-inverting input terminal | Paired with −IN for true differential amplification; high 20 GΩ||2 pF input impedance minimizes loading. |
| 4 (−VS) | Negative supply rail | Connect to ground in single-supply mode; supports −1.1 V to −18 V in dual-supply operation. |
| 5 (REF) | Reference voltage input | Defines output zero point; drives virtual ground for bipolar signals or isolates load ground from sensor ground. |
| 6 (OUTPUT) | Amplified output node | Rail-to-rail swing enables full utilization of ADC input range without external level-shifting. |
| 7 (+VS) | Positive supply rail | Accepts +2.2 V to +36 V (single) or +1.1 V to +18 V (dual); decoupling capacitor required at pin. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 85 μA max supply current enables >10-year battery life in portable EEG recorders using CR2032 cells. |
| Rail-to-rail output | Swings within 25 mV of rails at RL = 20 kΩ - preserves 99% of available dynamic range on 3 V supplies. |
| Single-resistor gain programming | G = 5 + (200 kΩ/RG) eliminates trimming potentiometers and reduces BOM count vs. discrete designs. |
| Laser-trimmed precision | 0.01% internal gain accuracy and 10 ppm/°C gain drift ensure stable calibration over temperature in field-deployed sensors. |
| High CMRR over frequency | 83 dB minimum at 60 Hz enables direct connection to unshielded thermocouple wires in electrically noisy factories. |
Applications
| ECG Signal Conditioning | 4–20 mA Loop Receiver |
|---|---|
|
Use Scenario: Amplifying microvolt-level differential cardiac signals from dry electrodes in ambulatory monitors. IC Role / Device Role / Timing Role: Primary instrumentation amplifier providing programmable gain (G = +100), high CMRR, and rail-to-rail output into 12-bit SAR ADC. Use Value: 125 μV max input offset and 83 dB CMRR suppress baseline wander and 50 Hz interference without analog filtering. |
Use Scenario: Converting 4–20 mA loop current to precise 0.2–1.0 V output for microcontroller ADC sampling in PLC I/O modules. IC Role / Device Role / Timing Role: Low-power, single-supply instrumentation amplifier with REF pin used to set 0.2 V output floor. Use Value: 85 μA quiescent current allows full 4–20 mA compliance voltage margin while maintaining 0.1% gain accuracy. |
| Thermocouple Amplifier | Strain Gauge Bridge Interface |
|
Use Scenario: Cold-junction-compensated K-type thermocouple amplification in handheld temperature calibrators. IC Role / Device Role / Timing Role: Precision gain stage (G = +1000) with REF pin biased to 1.25 V to center output in 0–2.5 V ADC range. Use Value: 38 nV/√Hz RTI noise and 0.56 µV p-p 0.1–10 Hz noise preserve sub-0.1°C resolution at 25°C ambient. |
Use Scenario: Amplifying 2 mV/V bridge output from load-cell sensors in industrial weighing systems. IC Role / Device Role / Timing Role: Fixed-gain (G = +5) instrumentation amplifier with laser-trimmed resistors ensuring 0.03% gain accuracy. Use Value: 10 ppm/°C gain drift and 1 μV/°C offset drift minimize recalibration frequency in uncontrolled environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8421ARZ | Higher bandwidth (12 MHz), lower noise (1.2 nV/√Hz), but 1.2 mA supply current - 14× higher than AD627BRZ. | Suitable for high-speed data acquisition where power is not constrained; unsuitable for coin-cell-powered devices. | Select AD8421ARZ only when bandwidth >100 kHz and noise <2 nV/√Hz are mandatory; AD627BRZ remains optimal for sub-100 kHz, battery-critical use cases. |
| INA333AIDR | Lower quiescent current (50 μA), same gain range (1–1000), but 50 μV max offset (vs. 125 μV) and 60 kHz bandwidth at G = +5. | Better for ultra-low-power, moderate-bandwidth applications (e.g., wearable biosensors); lacks AD627BRZ's 80 kHz capability. | Choose INA333AIDR for longest battery life where 60 kHz bandwidth suffices; retain AD627BRZ when 80 kHz and guaranteed 83 dB CMRR at 60 Hz are required. |
Compared with AD8421ARZ and INA333AIDR, the AD627BRZ uniquely balances micropower operation (85 μA), 80 kHz bandwidth, and high CMRR (83 dB @ 60 Hz) - making it the only option among the three that meets simultaneous requirements for battery-powered ECG front-ends and industrial loop receivers.
Availability
AD627BRZ is available at Aetrix Electronics and suitable for ECG signal conditioning, 4–20 mA loop receivers, thermocouple amplification, and strain gauge bridge interfaces requiring stable component supply across production lifecycles.
Supply support for AD627BRZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD627 belongs to Analog Devices' precision instrumentation amplifier product line, designed specifically for low-power, high-accuracy sensor signal conditioning in medical, industrial, and portable measurement systems.
FAQ
What is the maximum gain achievable with the AD627BRZ, and how is it set?
The AD627BRZ achieves a maximum gain of 1000 by placing a 205 Ω resistor between Pins 1 and 8 (RG). Gain follows G = 5 + (200 kΩ/RG), so RG = ∞ yields G = +5. The AD627BRZ datasheet specifies 0.25% max gain error at G = +1000 (AD627B grade), and laser-trimmed internal resistors ensure stability over temperature. External RG tolerance directly impacts total system gain accuracy.
Does the AD627BRZ support true rail-to-rail input common-mode range?
No - the AD627BRZ does not support rail-to-rail input common-mode voltage. Its specified input common-mode range is (−VS) − 0.1 V to (+VS) − 1 V. For example, with +VS = 3 V and −VS = 0 V (single supply), the usable input common-mode range is −0.1 V to +2.0 V. This limitation must be observed in single-supply thermocouple or bridge applications to avoid clipping or degraded CMRR.
Can the AD627BRZ operate from a single 3.3 V supply, and what is its output swing under that condition?
Yes, the AD627BRZ operates from a single 3.3 V supply (−VS = 0 V, +VS = 3.3 V). With RL = 20 kΩ, its output swings from 25 mV above −VS (0.025 V) to 70 mV below +VS (3.23 V), delivering 3.205 V of usable range. This rail-to-rail output preserves >97% of full-scale ADC range - critical for maximizing resolution in 12-bit data acquisition systems.
How does the REF pin function in the AD627BRZ, and what happens if it is left unconnected?
The REF pin defines the output voltage offset: VOUT = (V+IN − V−IN) × G + VREF. If left unconnected, the REF pin floats, causing unpredictable output bias and potential instability. It must be driven by a low-impedance source (e.g., voltage divider or op-amp buffer) - especially critical in single-supply systems amplifying bipolar signals or isolating load ground. The AD627BRZ datasheet specifies 125 kΩ input impedance at REF.
What is the CMRR performance of the AD627BRZ at 60 Hz, and why is this value significant for industrial applications?
The AD627BRZ guarantees ≥83 dB CMRR at 60 Hz (AD627B grade, G = +5, ±5 V supplies). This specification ensures rejection of mains-borne interference in factory environments - for example, reducing 1 V of 60 Hz common-mode noise to ≤14 μV at the output. Unlike many micropower amplifiers whose CMRR collapses above 10 Hz, the AD627BRZ sustains high rejection up to 200 Hz due to its feedforward-compensated architecture.
AD627BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.06V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 80 kHz
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 60µA
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD627BRZ FAQ
1.How can I place an order for AD627BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD627BRZ 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 AD627BRZ reliable?
The price and inventory of AD627BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD627BRZ is usually 5 days.
3.What payment methods are accepted for AD627BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD627BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD627BRZ?
AD627BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD627BRZ 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 AD627BRZ?
For technical support, including AD627BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD627BRZ requirements.
6.How does Aetrix verify that AD627BRZ is sourced from the original manufacturer or authorized distributors?
All AD627BRZ 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 AD627BRZ meets industry standards.
7.What is the process for return or replacement of AD627BRZ?
All AD627BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD627BRZ, 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 AD627BRZ part is unused and in its original packaging.
Return procedure for AD627BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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