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Analog Devices Inc. AD8251ARMZ-R7
- Part No.:
- AD8251ARMZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8251ARMZ-R7.pdf
- Description:
- IC INST AMP 1 CIRCUIT 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:181
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Product details
Overview
AD8251ARMZ-R7 from Analog Devices is a programmable gain instrumentation amplifier (PGIA) with iCMOS® process technology, delivering 10 MHz bandwidth, 20 V/μs slew rate, and digitally selectable gains of 1, 2, 4, or 8. It features 98 dB minimum CMRR at G = 8, 1.8 μV/°C offset drift, and 785 ns settling time to 0.001%, making it ideal for high-precision sensor signal conditioning in data acquisition systems.
For engineers reviewing the AD8251ARMZ-R7 datasheet, AD8251ARMZ-R7 pinout, AD8251ARMZ-R7 application, or AD8251ARMZ-R7 equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The AD8251ARMZ-R7 implements a classic 3-op-amp topology with laser-trimmed internal resistor arrays enabling precise, stable gain switching. Its iCMOS® process supports ±5 V to ±15 V dual supplies and delivers GΩ input impedance (5.3 GΩ differential, 1.25 GΩ common-mode) while maintaining low distortion (−110 dB THD at 1 kHz).
Gain selection operates in either transparent mode (WR tied to −VS, A0/A1 directly control gain) or latched mode (WR edge-triggered), with guaranteed 325 ns gain switching time and <10 ppm/°C gain drift across all settings. CMRR remains ≥80 dB up to 50 kHz at G = 1, enabled by balanced input layout and optimized pinout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 10 MHz at G = 1–2; enables accurate amplification of fast sensor transients without phase lag in high-sample-rate ADC interfaces. |
| Slew Rate | 20 V/μs min at G = 1; supports full-scale step response within sub-microsecond windows for dynamic signal capture. |
| CMRR | 98 dB min at G = 8; rejects >99.99% of common-mode noise from noisy industrial environments or long sensor cables. |
| Settling Time | 785 ns to 0.001% at G = 1; ensures measurement accuracy after gain or input changes in time-critical DAQ cycles. |
| Input Impedance | 5.3 GΩ || 0.5 pF differential; prevents loading of high-impedance sources like piezoelectric sensors or pH electrodes. |
| Offset Drift | 1.8 μV/°C max at G = 8; maintains calibration stability over wide temperature ranges without frequent recalibration. |
| Noise Density | 18 nV/√Hz max at G = 8; preserves signal integrity for low-level biopotential or strain gauge measurements. |
| Supply Range | ±5 V to ±15 V; accommodates legacy industrial rails and modern low-noise ±12 V systems without level-shifting. |
Pinout & Package
The AD8251ARMZ-R7 is housed in a 10-lead MSOP package (3 mm × 3 mm, 0.5 mm pitch), optimized for high-density PCB layouts and thermal performance in space-constrained instrumentation modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Inverting Input | True differential input node; matched to +IN for maximum CMRR and minimal input bias current error. |
| 2 (DGND) | Digital Ground Reference | Isolated ground for logic interface; must be separated from analog ground to prevent digital noise coupling. |
| 3 (−VS) | Negative Supply Rail | Accepts −5 V to −15 V; powers internal amplifiers and sets output swing lower limit (−13.5 V typical). |
| 4 (A0) | Gain LSB Control | Logic input defining gain bit 0; used with A1 and WR to select G = 1, 2, 4, or 8 in latched or transparent mode. |
| 5 (A1) | Gain MSB Control | Logic input defining gain bit 1; timing-critical in latched mode (requires 20 ns setup before WR falling edge). |
| 6 (WR) | Write Enable | Edge-triggered latch control; falling edge captures A0/A1 state in latched mode; tied to −VS for transparent operation. |
| 7 (OUT) | Amplified Output | Single-ended output capable of ±13.5 V swing into 2 kΩ; drives SAR or sigma-delta ADC inputs directly. |
| 8 (+VS) | Positive Supply Rail | Accepts +5 V to +15 V; powers internal amplifiers and defines upper output voltage limit (+13.5 V typical). |
| 9 (REF) | Reference Input | DC offset adjustment point; accepts −VS to +VS; sets output common-mode level independent of gain setting. |
| 10 (+IN) | Noninverting Input | True differential input node; matched to −IN for precision differential gain and rejection of EMI-induced common-mode signals. |
Key Features
| Feature | Design Value |
|---|---|
| iCMOS® Process Integration | Enables monolithic integration of precision analog circuitry and robust digital interface on single die, eliminating external resistor matching errors and improving temperature tracking. |
| Dual Gain Programming Modes | Transparent mode (WR = −VS) allows immediate gain updates; latched mode (edge-triggered WR) enables shared bus control with other PGAs or multiplexers on same PCB. |
| Laser-Trimmed Resistor Array | Guarantees ≤0.04% gain error at G = 2–8 and ≤9 ppm nonlinearity at G = 1, eliminating need for system-level gain calibration. |
| High-Speed Precision DC Performance | Combines 10 MHz bandwidth with 1.8 μV/°C offset drift and 10 ppm/°C gain drift-enabling both fast transient capture and stable long-term measurement accuracy. |
| Optimized Pinout for CMRR | Physically symmetrical +IN/−IN placement and dedicated DGND reduce parasitic capacitance imbalance, ensuring ≥80 dB CMRR maintained to 50 kHz. |
| Wide Common-Mode Input Range | Accepts inputs from −VS + 1.5 V to +VS − 1.5 V (e.g., −13.5 V to +13.5 V at ±15 V supplies), supporting direct interfacing with bipolar sensor outputs. |
Applications
| Strain Gauge Readout System | Medical ECG Front-End |
|---|---|
Use Scenario: Amplifying mV-level Wheatstone bridge outputs from load cells or pressure sensors in industrial test stands. IC Role / Device Role / Timing Role: Programmable gain instrumentation amplifier providing adjustable gain (G = 1–8) to match varying bridge sensitivities and maximize ADC dynamic range utilization. Use Value: 98 dB CMRR suppresses power-line interference; 785 ns settling ensures accurate sampling at ≥1 MSPS ADC rates; GΩ input impedance prevents bridge imbalance errors. | Use Scenario: Conditioning low-amplitude, high-impedance biopotential signals from patient electrodes in portable ECG monitors. IC Role / Device Role / Timing Role: First-stage PGIA with G = 100 (via external gain stage) rejecting 50/60 Hz mains noise while preserving microvolt-level ST-segment details. Use Value: 1.8 μV/°C offset drift minimizes baseline wander over body temperature shifts; 18 nV/√Hz noise floor resolves sub-μV cardiac features without additional filtering. |
| Automated Test Equipment (ATE) | High-Speed Data Acquisition Module |
Use Scenario: Multi-channel voltage/current measurement in semiconductor wafer probers requiring rapid gain reconfiguration between DUT types. IC Role / Device Role / Timing Role: Digitally controlled PGIA enabling software-selectable gain per channel via SPI-to-parallel logic interface, synchronized with test sequence execution. Use Value: 325 ns gain switching time allows sub-microsecond reconfiguration; latched mode supports shared A0/A1 bus across 16+ channels, reducing FPGA I/O count. | Use Scenario: Front-end for 16-bit, 1 MSPS simultaneous-sampling ADC in vibration analysis systems capturing broadband mechanical spectra. IC Role / Device Role / Timing Role: High-bandwidth, low-distortion amplifier driving ADC input with minimal group delay and −110 dB THD at 1 kHz. Use Value: 10 MHz bandwidth preserves harmonics up to 5th order; 20 V/μs slew rate handles fast transients from impact events without slewing distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable gain instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8253ARMZ | Lower bandwidth (3.5 MHz at G = 1), higher noise (25 nV/√Hz at G = 8), SPI interface instead of parallel; 12-bit integrated ADC included. | Targeted at lower-speed, integrated data acquisition where on-chip ADC eliminates external conversion stage. | Select AD8253ARMZ when system-level integration (PGA + ADC) reduces BOM count and board area is constrained; avoid if >5 MSPS sampling or <18 nV/√Hz noise required. |
| LTC6915CMS8#PBF | Wider supply range (±2.25 V to ±18 V), higher CMRR (110 dB at G = 100), but slower settling (1.2 μs to 0.01%), no latched gain mode. | Optimized for ultra-high-precision DC measurements (e.g., weigh scales) rather than mixed-signal DAQ with fast transients. | Select LTC6915CMS8#PBF when ultimate DC accuracy (0.001% gain error) and rail-to-rail output are critical; avoid if sub-microsecond settling or digital bus sharing needed. |
Compared with AD8251ARMZ-R7, AD8253ARMZ trades speed and noise performance for embedded ADC functionality, while LTC6915CMS8#PBF prioritizes ultra-low DC error over ac response-making AD8251ARMZ-R7 the optimal balance of bandwidth, precision, and flexible digital control for high-fidelity sensor DAQ.
Availability
AD8251ARMZ-R7 is available at Aetrix Electronics and suitable for data acquisition, biomedical analysis, and test and measurement applications requiring stable component supply, guaranteed long-term manufacturability, and traceable sourcing from authorized channels.
Supply support for AD8251ARMZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with R&D and manufacturing facilities worldwide.
The AD8251ARMZ-R7 belongs to Analog Devices' precision instrumentation amplifier product line, designed specifically for high-accuracy, high-speed sensor signal conditioning in demanding industrial, medical, and test equipment environments.
FAQ
What gain settings does the AD8251ARMZ-R7 support, and how are they configured?
The AD8251ARMZ-R7 supports four discrete gains: 1, 2, 4, and 8. Configuration occurs via two digital inputs (A0, A1) using either transparent mode (WR tied to −VS) or latched mode (WR edge-triggered). In transparent mode, gain changes immediately with A0/A1 logic levels; in latched mode, the WR falling edge captures the A0/A1 state. Both methods are fully supported in the AD8251ARMZ-R7 datasheet Rev. B and validated across the −40°C to +85°C operating range.
Does the AD8251ARMZ-R7 require external resistors for gain setting?
No, the AD8251ARMZ-R7 does not require external resistors for gain setting. It integrates a laser-trimmed precision resistor array and internal switching circuitry to achieve exact gains of 1, 2, 4, and 8. This monolithic architecture eliminates external component tolerance errors, ensures excellent gain temperature stability (≤10 ppm/°C), and guarantees ≤0.04% gain error at G = 2–8-key specifications confirmed in Table 2 of the AD8251ARMZ-R7 datasheet Rev. B.
What is the maximum supply voltage for the AD8251ARMZ-R7, and what happens beyond that limit?
The absolute maximum supply voltage for the AD8251ARMZ-R7 is ±17 V, as specified in Table 3 of the datasheet Rev. B. Operation beyond ±17 V risks permanent damage due to junction breakdown or metallization failure. The device is rated for continuous operation from ±5 V to ±15 V; at ±15 V, it delivers ±13.5 V output swing and full 10 MHz bandwidth. Exceeding ±17 V violates Absolute Maximum Ratings and voids reliability guarantees for the AD8251ARMZ-R7.
Can the AD8251ARMZ-R7 drive an ADC directly, and what load conditions are validated?
Yes, the AD8251ARMZ-R7 is explicitly characterized to drive ADC inputs directly. Datasheet Rev. B confirms stable operation into 2 kΩ and 10 kΩ loads (Table 2, Figure 34–35), with 785 ns settling to 0.001% into 10 kΩ. Its low output impedance (<1 Ω), −110 dB THD at 1 kHz, and 20 V/μs slew rate ensure minimal distortion and accurate sampling for 16-bit+ SAR and sigma-delta ADCs-validated in "Driving an ADC" section (page 20) and Figures 37–40 of the AD8251ARMZ-R7 datasheet.
How does the AD8251ARMZ-R7 handle reference voltage injection, and what is its REF pin tolerance?
The REF pin of the AD8251ARMZ-R7 accepts any voltage from −VS to +VS and adds it directly to the output with unity gain (1 ± 0.0001 V/V), enabling precise DC level shifting without affecting gain accuracy. Input current into REF is specified at 1 μA max (Table 2), and its 20 kΩ input resistance allows direct connection to DAC outputs or precision voltage references. This behavior is confirmed in the "Reference Terminal" section (page 19) and electrical specs table of the AD8251ARMZ-R7 datasheet Rev. B.
AD8251ARMZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- iCMOS®
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 30V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 10 MHz
- Current - Input Bias:
- 5 nA
- Voltage - Input Offset:
- 70 µV
- Current - Supply:
- 4.1mA
- Current - Output / Channel:
- 37 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
AD8251ARMZ-R7 FAQ
1.How can I place an order for AD8251ARMZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8251ARMZ-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 AD8251ARMZ-R7 reliable?
The price and inventory of AD8251ARMZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8251ARMZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8251ARMZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8251ARMZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8251ARMZ-R7?
AD8251ARMZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8251ARMZ-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 AD8251ARMZ-R7?
For technical support, including AD8251ARMZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8251ARMZ-R7 requirements.
6.How does Aetrix verify that AD8251ARMZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8251ARMZ-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 AD8251ARMZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8251ARMZ-R7?
All AD8251ARMZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8251ARMZ-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 AD8251ARMZ-R7 part is unused and in its original packaging.
Return procedure for AD8251ARMZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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