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Analog Devices Inc. AD627BRZ-R7
- Part No.:
- AD627BRZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD627BRZ-R7.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,440
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Product details
Overview
AD627BRZ-R7 from Analog Devices is a micropower, rail-to-rail output instrumentation amplifier designed for precision signal conditioning in low-power systems. It operates on single supplies from +2.2 V to +36 V or dual supplies from ±1.1 V to ±18 V, draws ≤85 μA quiescent current, delivers 80 kHz bandwidth at G = +5, and achieves 83 dB minimum CMRR (G = +5). It is used in battery-powered ECG monitors and 4 mA–20 mA loop receivers.
For engineers reviewing the AD627BRZ-R7 datasheet, AD627BRZ-R7 pinout, AD627BRZ-R7 application, or AD627BRZ-R7 equivalent, key selection criteria include micropower operation (<85 μA), gain programmability (5–1000 via single external resistor), rail-to-rail output swing, input offset voltage ≤125 µV (AD627B grade), and 8-lead SOIC_N package compatibility with industrial and medical signal chains.
Technical Context
The AD627BRZ-R7 implements a modified current-feedback architecture with interstage feedforward compensation, enabling superior CMRR (>83 dB up to 200 Hz) without sacrificing bandwidth or power. Its two-loop internal topology uses laser-trimmed thin-film resistors (R1–R4) to fix nominal gain at +5 and enable precise external gain scaling via RG across Pins 1 and 8.
It supports both single- and dual-supply operation with rail-to-rail output stage, reference terminal (Pin 5) for output level shifting, and differential input range extending to within 1 V of either supply rail. Input bias current remains ≤10 nA over temperature, and RTI voltage noise is 38 nV/√Hz at 1 kHz (G = +100).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | +2.2 V to +36 V (single) or ±1.1 V to ±18 V (dual) - enables direct interface with 3.3 V, 5 V, and ±15 V systems without level-shifting. |
| Quiescent Current | ≤85 μA - allows continuous operation for years on coin-cell batteries in portable medical devices. |
| Gain Range | 5 (no resistor) to 1000 (via RG) - simplifies design with one external resistor; G = +5 fixed by internal laser trimming. |
| Input Offset Voltage | ≤125 µV (AD627B, dual supply) - minimizes DC error in thermocouple and bridge sensor amplification. |
| CMRR | ≥83 dB at G = +5, DC–60 Hz - rejects 50/60 Hz line noise in industrial transducer interfaces. |
| Bandwidth | 80 kHz at G = +5 - supports ECG waveform acquisition up to ~30 Hz with ample phase margin. |
| Output Swing | Rail-to-rail (±25 mV of rails, RL = 100 kΩ) - maximizes dynamic range in low-voltage battery-powered systems. |
Pinout & Package
AD627BRZ-R7 is housed in an 8-lead SOIC_N (R-8) package, 3.9 mm × 4.9 mm, with standard industry footprint and 1.27 mm pitch. Pin 1 is marked with a beveled corner or dot.
| 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 | Differential input node; accepts signals down to −VS − 0.1 V; high impedance (20 GΩ || 2 pF). |
| 3 (+IN) | Noninverting input | Differential input node; common-mode range extends to ±VS − 1 V; matched to −IN for CMRR. |
| 4 (−VS) | Negative supply rail | Connect to ground (single supply) or negative rail (dual supply); decoupling capacitor required. |
| 5 (REF) | Reference voltage input | Defines output zero point; drives output as VOUT = G·(V+ − V−) + VREF; requires low-impedance source. |
| 6 (OUTPUT) | Amplified output | Rail-to-rail voltage output; capable of sourcing/sinking ±25 mA; load-dependent swing specified per RL. |
| 7 (+VS) | Positive supply rail | Connect to VCC (single supply) or positive rail (dual supply); decoupling capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 85 μA max supply current enables multi-year battery life in portable ECG and IoT sensor nodes. |
| Rail-to-rail output | Swings within 7 mV of rails (RL = 100 kΩ) - preserves full signal amplitude in 3.3 V or lower systems. |
| Laser-trimmed gain accuracy | 0.01% factory-trimmed G = +5 baseline - eliminates need for system-level gain calibration in precision measurement. |
| High CMRR over frequency | 83 dB minimum at 60 Hz (AD627B) - ensures robust rejection of mains interference in medical and industrial environments. |
| Single-resistor gain programming | G = 5 + (200 kΩ/RG) - reduces BOM count and layout complexity vs. discrete three-op-amp IA designs. |
Applications
| ECG Signal Conditioning | 4–20 mA Loop Receiver |
|---|---|
Use Scenario: Amplifying microvolt-level differential signals from dry-electrode ECG sensors in wearable monitors. IC Role / Device Role / Timing Role: Precision instrumentation amplifier providing programmable gain, high CMRR, and rail-to-rail output for ADC input scaling. Use Value: 85 μA quiescent current extends battery life; 125 µV max input offset minimizes baseline drift; 83 dB CMRR suppresses 50/60 Hz pickup. | Use Scenario: Converting 4–20 mA current loop signals to 0–5 V voltage outputs in PLC analog input modules. IC Role / Device Role / Timing Role: Low-power, high-accuracy current-to-voltage converter with reference-controlled output level shifting. Use Value: Single-supply operation (3.3 V or 5 V) simplifies power design; REF pin enables direct interfacing with isolated ADC references. |
| Thermocouple Amplifier | Bridge Sensor Interface |
Use Scenario: Amplifying low-level Seebeck voltages (μV/°C) from K-type thermocouples with cold-junction compensation. IC Role / Device Role / Timing Role: Micropower instrumentation amplifier with low input bias current (≤10 nA) and low RTI noise (38 nV/√Hz). Use Value: 125 µV max VOS and 1 µV/°C max drift ensure <0.5°C error over 0–100°C range without recalibration. | Use Scenario: Reading mV-level outputs from strain-gauge or pressure transducer Wheatstone bridges in handheld test equipment. IC Role / Device Role / Timing Role: High-input-impedance (20 GΩ), low-noise amplifier with programmable gain to match bridge sensitivity and ADC full-scale range. Use Value: Gain error ≤0.06% (G = +5, AD627B) and nonlinearity ≤10 ppm reduce measurement uncertainty in Class I industrial sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8421ARMZ | Higher bandwidth (12 MHz), higher supply current (450 μA), fixed G = 10/100/1000; no single-resistor gain tuning. | Better for high-speed, wide-dynamic-range applications (e.g., vibration analysis); unsuitable for ultra-low-power battery use. | Select AD8421ARMZ when bandwidth >100 kHz and power budget >400 μA is acceptable. |
| INA333AIDRGT | Lower quiescent current (50 μA), lower offset (25 µV), but narrower supply range (1.8–5.5 V); only single-supply rated. | Ideal for 3.3 V portable electronics; cannot support ±15 V industrial inputs or >5.5 V supplies. | Select INA333AIDRGT for 3.3 V battery-powered devices requiring sub-50 μA operation and <25 µV offset. |
Compared with AD8421ARMZ and INA333AIDRGT, AD627BRZ-R7 uniquely balances micropower operation (≤85 μA), wide supply flexibility (±1.1 V to ±18 V / +2.2 V to +36 V), and simple single-resistor gain programming - making it optimal for legacy industrial and medical designs requiring field-replaceable gain adjustment and long-term supply continuity.
Availability
AD627BRZ-R7 is available at Aetrix Electronics and suitable for 4–20 mA loop receivers, portable ECG monitors, and thermocouple amplifier circuits requiring stable component supply across extended product lifecycles.
Supply support for AD627BRZ-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 AD627 belongs to Analog Devices' precision instrumentation amplifier product line, engineered for low-power, high-accuracy signal conditioning in battery-operated and loop-powered measurement systems where dc precision and ac noise rejection are critical.
FAQ
What is the maximum gain achievable with AD627BRZ-R7?
The AD627BRZ-R7 supports a gain range of 5 to 1000, set by an external resistor RG connected between Pins 1 and 8. With no resistor (open circuit), gain defaults to +5. Maximum gain is calculated as G = 5 + (200 kΩ/RG); for G = 1000, RG = 205 Ω (1% tolerance recommended). The AD627BRZ-R7 datasheet confirms this relationship applies across its full operating temperature range (−40°C to +85°C).
Does AD627BRZ-R7 support true rail-to-rail input operation?
No, AD627BRZ-R7 does not support rail-to-rail input. Its input common-mode voltage range is specified as (−VS) − 0.1 V to (+VS) − 1 V, meaning the inputs must remain at least 1 V below the positive rail and 0.1 V above the negative rail. However, its output is rail-to-rail: for RL = 100 kΩ, it swings to within 7 mV of either supply rail. This distinction is critical when interfacing with sensors whose output approaches the supply rails.
What is the purpose of the REF pin on AD627BRZ-R7?
The REF pin (Pin 5) on AD627BRZ-R7 defines the output voltage offset: VOUT = G·(V+ − V−) + VREF. It enables level-shifting the output to match downstream ADC reference voltages or isolate ground domains. For optimal CMRR, REF must be driven by a low-impedance source (≤125 kΩ), and it is commonly tied to mid-supply in single-ended applications or to system ground in differential configurations. This functionality is explicitly documented in the AD627BRZ-R7 datasheet Section "Reference Terminal".
How does AD627BRZ-R7 compare to AD627ARZ in terms of performance and packaging?
AD627BRZ-R7 and AD627ARZ share identical electrical specifications and pinout but differ in grade and packaging. AD627BRZ-R7 is the B-grade version (125 µV max input offset, 1 µV/°C max drift), supplied in 7-inch tape-and-reel (R7 suffix). AD627ARZ is the A-grade (200 µV max offset, 3 µV/°C drift) in same SOIC_N package but with different reel packaging (RZ). Both meet the same absolute maximum ratings, bandwidth, and noise specs per Rev. E datasheet.
Can AD627BRZ-R7 operate from a 3.3 V single supply?
Yes, AD627BRZ-R7 is fully specified for single-supply operation from +2.2 V to +36 V, including 3.3 V. At VS = 3.3 V, it delivers rail-to-rail output swing (within 25 mV of rails, RL = 20 kΩ), 80 kHz bandwidth at G = +5, and maintains ≤85 μA quiescent current. Input common-mode range spans −0.1 V to +2.3 V, supporting typical sensor outputs. These parameters are verified in Table 1 (Single Supply) of the AD627BRZ-R7 datasheet Rev. E.
AD627BRZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-R7 FAQ
1.How can I place an order for AD627BRZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD627BRZ-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 AD627BRZ-R7 reliable?
The price and inventory of AD627BRZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD627BRZ-R7 is usually 5 days.
3.What payment methods are accepted for AD627BRZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD627BRZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD627BRZ-R7?
AD627BRZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD627BRZ-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 AD627BRZ-R7?
For technical support, including AD627BRZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD627BRZ-R7 requirements.
6.How does Aetrix verify that AD627BRZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD627BRZ-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 AD627BRZ-R7 meets industry standards.
7.What is the process for return or replacement of AD627BRZ-R7?
All AD627BRZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD627BRZ-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 AD627BRZ-R7 part is unused and in its original packaging.
Return procedure for AD627BRZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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