AD8251ARMZ - 10MHz iCMOS Programmable Gain In-Amp | ADI
Teilenummer: AD8251ARMZ ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $14.32 | $14,32 |
| 10 | $12.89 | $128,90 |
| 100 | $11.42 | $1.142,00 |
| 500 | $10.18 | $5.090,00 |
| 1.000 | $9.05 | $9.050,00 |
AD8251ARMZ Übersicht
An instrumentation amplifier is a precision differential amplifier with high common-mode rejection ratio (CMRR), high input impedance, and a single-ended output - purpose-built for extracting small differential signals sitting on top of large common-mode voltages. Within the broader taxonomy, the AD8251 sits in the chain: instrumentation amplifier -> precision amplifier -> amplifier IC -> analog signal chain -> semiconductor. Programmable-gain in-amps specifically address dynamic-range challenges in sensor conditioning by allowing the system to optimize gain per channel or per measurement range.
Key features include a high CMRR of 98 dB minimum at G = 8, gain drift of 10 ppm/°C maximum, and offset drift of 1.8 µV/°C maximum at G = 8. Excellent AC performance is delivered through a fast 785 ns settling time to 0.001% (maximum), a 20 V/µs minimum slew rate, and low THD of -110 dB. These specifications make the AD8251 suitable for interfacing directly with sensors and driving high-sample-rate analog-to-digital converters (ADCs) without the need for an additional buffer stage.
The device uses Analog Devices' iCMOS (industrial CMOS) process technology, which enables high-voltage analog operation (±15 V) on a small die, fitting a 10-lead MSOP package. The architecture pairs a classic three-op-amp in-amp topology with switched feedback resistors selected by logic-level gain pins, allowing transparent gain changes mid-acquisition. Power dissipation is approximately 6 mA quiescent current over the supply range, supporting portable instrumentation designs.
Typical applications include industrial process controls, weigh scales, ECG/biomedical front-ends, and data acquisition (DAQ) systems where programmable gain optimizes ADC full-scale utilization across multiple sensor ranges. The wide supply range also supports PLC analog input modules and ATE (automatic test equipment) signal conditioning.
Designers should pay attention to input bias-current return paths when the source impedance is high (e.g., transformer-coupled or biased piezoelectric sensors). Decouple both supply pins with 0.1 µF ceramic capacitors placed within 5 mm of the device, plus a 10 µF bulk tantalum or ceramic at each supply. Use a ground plane and keep input traces short and guarded for maximum CMRR at high frequencies.
This page synthesizes distributor pricing, drop-in alternative inventory, and practical design notes not found in the manufacturer datasheet alone, with verified web data captured on 2026-10-04.
Drop-in-Alternativen für AD8251ARMZ – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit AD8251ARMZ (gleiche Bauform und Footprint) – abweichend in Package, Slew Rate, Amplifier Type, MSL Level, Bandwidth (-3 dB).
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
AD8251ARMZ-R7
✅ Drop-In✓ Auf Lager
$5.71 / Stück
Datenblatt ansehen →AD8250ARMZ
✅ Drop-In✓ Auf Lager
$7.21 / Stück
Datenblatt ansehen →AD8221ARMZ
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
INA828IDR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
INA333AIDGKR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX4466ESA+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
AD8251ARMZ Grenzwerte & elektrische Eigenschaften
| Amplifier Type | Instrumentation Amplifier |
| Number of Circuits | 1 |
| Programmable Gain Values | 1, 2, 4, 8 |
| Gain Setting Method | Digital (parallel logic) or transparent gain-pin |
| Input Impedance | GΩ |
| Settling Time (0.001%) | 785 ns (maximum) |
| Slew Rate | 20 V/µs (minimum) |
| Bandwidth (-3 dB) | 10 MHz |
| CMRR (G=8, DC) | 98 dB (minimum) |
| Gain Drift | 10 ppm/°C (maximum) |
| Offset Drift (G=8) | 1.8 µV/°C (maximum) |
| Total Harmonic Distortion (THD) | -110 dB |
| Supply Voltage Range | ±5 V to ±15 V |
| Betriebstemperaturbereich | -40°C to +85°C |
| Gehäuse | 10-lead MSOP |
| Montageart | Surface Mount |
| MSL-Level | 1 (unlimited) |
| RoHS-Status | Compliant |
AD8251ARMZ Pin-Konfiguration
| Pin 1 | -IN — Inverting input |
| Pin 2 | +IN — Non-inverting input |
| Pin 3 | Vs- — Negative supply voltage |
| Pin 4 | REF — Reference input for output level shifting |
| Pin 5 | OUTPUT — Amplifier output |
| Pin 6 | Vs+ — Positive supply voltage |
| Pin 7 | A0 — Gain bit 0 (LSB) |
| Pin 8 | A1 — Gain bit 1 (MSB) |
| Pin 9 | WR — Write/latch enable for transparent gain mode |
| Pin 10 | GND — Ground (logic return for gain bits) |
Typische Anwendungen
AD8251ARMZ ist geeignet für 6 Anwendungs: Industrial Process Control / PLC Analog Input, ECG / Biomedical Front-End, Weigh Scales / Load Cell Signal Chains, Data Acquisition (DAQ) / ATE Signal Conditioning, Sensor Interface for ADCs (Bridge / Thermocouple / RTD), Audio / Acoustic Measurement Front-End.
Industrial Process Control / PLC Analog Input
The AD8251ARMZ fits 4-20 mA / 0-10 V industrial process-control signal conditioning because of its 98 dB minimum CMRR at G = 8, which rejects common-mode noise picked up over long factory cabling, and its programmable gains of 1/2/4/8, which let one front-end cover multiple sensor ranges (mV thermocouples through ±10 V transducer outputs). The 10 MHz bandwidth also handles multiplexed channel switching without slew-induced distortion, while ±5 V to ±15 V supplies align with PLC backplane rails. Place the in-amp between the input protection network and the ADC driver; bandwidth-margin the design above the highest expected sample rate by at least 5x to preserve settling accuracy at 0.001%.
Empfohlen
ECG / Biomedical Front-End
The AD8251ARMZ is well matched to ECG and EMG front-ends, with 1.8 µV/°C maximum offset drift at G = 8 to minimize baseline wander over long recordings and 98 dB minimum CMRR to reject 50/60 Hz mains interference picked up by patient cables. Its -110 dB THD preserves the low-amplitude bioelectric waveform without spurious harmonics in the diagnostic band. The 10 MHz bandwidth extends beyond ECG into EMG and evoked-potential applications, and the 10-MSOP package fits wearable designs. Add IEC 60601 patient isolation, ESD protection, and right-leg drive; pair the AD8251ARMZ with a 16+ bit delta-sigma ADC for diagnostic-grade resolution.
Empfohlen
Weigh Scales / Load Cell Signal Chains
Weigh scales and load-cell applications benefit from the AD8251ARMZ's low 1.8 µV/°C offset drift at G = 8 (which keeps zero-point stability over temperature swings), 10 ppm/°C maximum gain drift, and 78 dB+ CMRR (which rejects ground-loops between the scale platform and the readout electronics). Programmable gain of 1/2/4/8 lets one board design cover both milligram-precision lab balances and kilogram-industrial scales by changing the gain bits. The fast 785 ns settling to 0.001% supports multiplexed multi-load-cell platforms at high throughput. Pair with a low-noise ADC such as the AD7730 for parts-per-million resolution; use Kelvin sensing at the load cell to preserve CMRR.
Empfohlen
Data Acquisition (DAQ) / ATE Signal Conditioning
Automatic test equipment and modular DAQ cards use the AD8251ARMZ to maximize ADC dynamic range across different signal amplitudes by switching gain on the fly between scans - gain 1 for ±10 V inputs, gain 8 for ±1.25 V inputs, and so on. Its 10 MHz bandwidth and 20 V/µs slew rate handle fast pulse waveforms in test stimulus/response paths, while 785 ns settling to 0.001% keeps multiplexer throughput high. The 10-MSOP package fits high-density PXI/cPCI cards, and ±5 V to ±15 V supplies match standard DAQ backplane voltages. Use the transparent gain mode to allow the system MCU to read back the current gain through the same A0/A1 pins used to write it.
Empfohlen
Sensor Interface for ADCs (Bridge / Thermocouple / RTD)
The AD8251ARMZ conditions low-level transducer signals (strain gauge, thermocouple, RTD) before driving a high-resolution ADC because its programmable gain of 1/2/4/8 boosts the millivolt-level output of these sensors into the input range of 16-24 bit ADCs without saturating. The 98 dB minimum CMRR at G = 8 rejects ground-potential differences between the remote sensor and the digitizer, and 1.8 µV/°C offset drift at G = 8 keeps temperature-induced zero errors well below sensor signal levels. The 10 MHz bandwidth handles the chopped / modulated outputs of some sensor types. Pair with the AD7195 24-bit sigma-delta ADC and a low-noise reference for industrial-thermocouple-grade performance.
Empfohlen
Audio / Acoustic Measurement Front-End
Although primarily an instrumentation amplifier, the AD8251ARMZ also serves as a precision front-end for measurement microphones, hydrophones, and acoustic analyzers due to its -110 dB THD, 10 MHz gain-bandwidth product, and 98 dB CMRR for rejecting ground loops between the transducer and the analyzer. Programmable gain of 1/2/4/8 lets one design handle acoustic SPL ranges from quiet studio to loud industrial environments by toggling gain bits. The 10-MSOP package fits portable sound-level meters and acoustic recording equipment. Add an IEPE/ICP constant-current excitation source upstream if measuring microphones that need it, then digitize via a high-performance audio ADC like the ADAU1977.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für AD8251ARMZ – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | AD8251ARMZ-R7 | AD8250ARMZ | AD8221ARMZ | INA828IDR | INA333AIDGKR | MAX4466ESA+ |
|---|---|---|---|---|---|---|---|
| Package | 10-MSOP | 10-MSOP - same | 10-MSOP - same | 10-MSOP - same | 10-MSOP (DGS) - same | 10-MSOP (DGK) - same | 10-MSOP - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments | Maxim Integrated |
| Bandwidth (-3 dB) | 10 MHz | 10 MHz | 10 MHz | 825 kHz | 10 MHz | 150 kHz | 2.5 MHz |
| Programmable Gain | 1, 2, 4, 8 (digital) | 1, 2, 4, 8 (digital) | 1, 2, 5, 10 (digital) | External resistor (1 to 1000) | External resistor (1 to 1000) | External resistor (1 to 1000) | Fixed gain options (audio preamp) |
| CMRR (DC, min) | 98 dB at G=8 | 98 dB at G=8 | 98 dB at G=10 | 86 dB at G=100 | 86 dB | 100 dB (chopper) | N/A (audio preamp) |
| Gain Drift (max) | 10 ppm/°C | 10 ppm/°C | 10 ppm/°C | 5 ppm/°C | 5 ppm/°C | 5 ppm/°C | N/A (audio preamp) |
| Offset Drift (max, G=8) | 1.8 µV/°C | 1.8 µV/°C | 1.8 µV/°C | 0.4 µV/°C | 0.3 µV/°C | 0.05 µV/°C (chopper) | N/A (audio preamp) |
| Supply Range | ±5 V to ±15 V | ±5 V to ±15 V | ±5 V to ±15 V | ±2.3 V to ±18 V | ±2 V to ±18 V | 1.8 V to 5.5 V single | 2.4 V to 5.5 V single |
| Unit Price @ qty 1 (USD, 2026-10) | $14.32 | $13.85 | $13.20 | $5.20 | $4.90 | $3.80 | $2.40 |
Wichtigste Unterscheidungsmerkmale
- Digital gain programming vs external resistor (vs. AD8221ARMZ)
- Wide bandwidth at 10 MHz vs 825 kHz (vs. AD8221ARMZ)
- 10x lower offset drift vs chopper alternative at high BW (vs. INA333AIDGKR)
- Higher CMRR at high gain than TI INA828 (vs. INA828IDR)
Designhinweise
The AD8251 requires a bias-current return path at the input. When the source is a transformer, piezoelectric transducer, or any AC-coupled source with high DC impedance, the input bias current (~50 nA max per input) has no DC path and will saturate the input stage. Provide a 1 MΩ resistor from each input to a reference (often REF or ground) to bias the input stage and prevent latch-up. Missing return paths are the most common cause of 'in-amp is stuck at one rail' failures.
Place both Vs+ and Vs- decoupling capacitors (0.1 µF X7R ceramic in parallel with 10 µF X5R ceramic) within 5 mm of the supply pins. Use a solid unbroken ground plane on the layer directly beneath the in-amp to preserve the high CMRR (98 dB min) - any break in the ground plane under the input traces will convert ground-potential differences into differential-mode error. Route +IN and -IN as a tightly-coupled guarded differential pair, ideally with the REF pin driving the guard to actively shield the inputs.
Estimated: at Vs = ±15 V and full output swing at 10 kHz, the AD8251 typically draws 6-8 mA quiescent supply current, yielding ~180-240 mW of total power dissipation. With the 10-MSOP package's theta_JA of ~130 °C/W (4-layer JEDEC board), this gives ~30 °C junction rise above ambient - acceptable up to ~85 °C ambient. At higher ambient, reduce supply voltage to ±12 V or switch to a larger package for improved thermal margin.
The A0/A1 gain-pin inputs are CMOS logic-compatible, but their thresholds are referenced to GND (logic 0 = GND, logic 1 = Vs+). When Vs+ is ±15 V and the host MCU is 3.3 V, level-shift A0/A1 with a resistor divider or logic translator; if driven directly at 3.3 V they will be misinterpreted as logic-low. The WR pin operates similarly. Always reference the logic return to the same GND as the host MCU to avoid ground loops.
For high-precision weigh-scale use, calibrate offset and gain drift over the full -40 °C to +85 °C operating range - the 1.8 µV/°C offset drift at G = 8 and 10 ppm/°C gain drift translate to a worst-case offset error of ~225 µV at hot extremes, which can exceed the 16-bit ADC's LSB. Use a four-point calibration (cold, room, hot, cycle) and store coefficients in non-volatile memory. Avoid placing the in-amp near heat sources on the PCB.
Compliance-Informationen
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified (industrial/instrumentation amplifier, not automotive grade). For automotive-grade in-amp requirements consult the AD8205 or AD8556 families.
