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Analog Devices Inc. ADA4051-2ACPZ-R7
- Part No.:
- ADA4051-2ACPZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad, CSP
- Datasheet:
-
ADA4051-2ACPZ-R7.pdf
- Description:
- IC OPAMP ZERO-DRIFT 2CIRC 8LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:918
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Product details
Overview
ADA4051-2ACPZ-R7 from Analog Devices is a dual, micropower, zero-drift rail-to-rail input/output operational amplifier optimized for precision sensor signal conditioning in ultra-low-power systems. It delivers 15 µV maximum offset voltage, 20 nV/°C drift, 13 µA supply current per amplifier, and operates from 1.8 V to 5.5 V - enabling high-accuracy measurements in battery-powered medical instrumentation and electronic scales.
For engineers reviewing the ADA4051-2ACPZ-R7 datasheet, ADA4051-2ACPZ-R7 pinout, ADA4051-2ACPZ-R7 application, or ADA4051-2ACPZ-R7 equivalent, key selection criteria include micropower operation at 1.8 V, guaranteed rail-to-rail swing across −40°C to +125°C, and verified channel separation of 140 dB at 100 Hz - critical for dual-channel low-noise front-ends.
Technical Context
The ADA4051-2ACPZ-R7 implements a patented autocorrection feedback (ACFB) chopper architecture with 40 kHz chopping frequency, suppressing initial offset in the DC domain rather than filtering ripple in the AC domain. This eliminates 1/f noise while avoiding aliasing-induced in-band noise typical of auto-zeroing amplifiers.
Its signal path integrates three transconductance stages (Gm1–Gm3), local ripple sensing via Gm4, demodulation through CHOP3, and nulling by Gm5 - all synchronized to the same clock. A feedforward path (Gm6 = Gm1) compensates phase shift, ensuring unity-gain stability with 40° phase margin and 125 kHz gain bandwidth at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8 V to 5.5 V - enables direct interface with single-cell Li-ion (3.0 V), coin-cell (1.8–3.0 V), and low-voltage logic rails without regulation. |
| Max Offset Voltage | 15 µV - ensures ≤0.0015% error in 1 V full-scale sensor outputs, critical for 16-bit+ resolution systems. |
| Offset Drift | 20 nV/°C - contributes only 2.4 µV error over −40°C to +125°C, eliminating need for system-level calibration in industrial environments. |
| Supply Current per Amp | 13 µA typical - supports >10-year battery life in continuous-sensing applications using CR2032 cells. |
| CMRR / PSRR | 110 dB minimum - rejects common-mode noise from shared PCB ground and power supply ripple in mixed-signal layouts. |
| Rail-to-Rail I/O | VOH ≥ 1.796 V / VOL ≤ 3 mV at 1.8 V - maximizes dynamic range when interfacing with 1.8 V ADCs or microcontrollers. |
| Gain Bandwidth | 125 kHz at 5 V - sufficient for anti-aliasing filtering and closed-loop control of slow-moving physical sensors (e.g., strain gauges, thermistors). |
Pinout & Package
ADA4051-2ACPZ-R7 is packaged in an 8-lead LFCSP (CP-8-13) with exposed pad connected to V– for thermal and noise performance. Pin 1 is OUT A; pin 2 is –IN A; pin 3 is +IN A; pin 4 is V–; pin 5 is +IN B; pin 6 is –IN B; pin 7 is OUT B; pin 8 is V+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Drives external load or next-stage input; rail-to-rail swing supports full utilization of 1.8 V ADC reference. |
| 2 (–IN A) | Inverting input A | High-impedance node (250 GΩ common-mode resistance); accepts differential sensor signals without loading. |
| 3 (+IN A) | Non-inverting input A | Matches –IN A bias current (≤50 pA typ); enables precision instrumentation amplifier configurations. |
| 4 (V–) | Negative supply | Exposed pad must be soldered to PCB ground plane to achieve specified θJA = 55°C/W and minimize thermal drift. |
| 5 (+IN B) | Non-inverting input B | Electrically isolated from Channel A; supports independent dual-sensor conditioning on single die. |
| 6 (–IN B) | Inverting input B | Same input specs as Pin 2; channel separation ≥140 dB prevents crosstalk in simultaneous sampling. |
| 7 (OUT B) | Amplifier B output | Independent output stage; no internal coupling - enables true dual-channel signal paths. |
| 8 (V+) | Positive supply | Accepts 1.8–5.5 V; PSRR ≥110 dB ensures stable gain even with noisy switching regulator supplies. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift chopper architecture | Eliminates 1/f noise and achieves <0.1 µV/°C drift - removes need for periodic recalibration in long-term monitoring systems. |
| 13 µA per amplifier supply current | Enables always-on sensor nodes with <1 µA total quiescent current when paired with low-power ADCs and MCUs. |
| Rail-to-rail input/output at 1.8 V | Delivers full 0–1.8 V output swing with <3 mV saturation - preserves signal integrity in single-supply, low-voltage data acquisition. |
| 140 dB channel separation | Prevents inter-channel interference in dual-sensor applications like bridge-based pressure transducers with temperature compensation. |
| −40°C to +125°C operation | Qualified for automotive under-hood, industrial motor control, and outdoor environmental sensing without derating. |
Applications
| Pressure and position sensors | Temperature measurements |
|---|---|
Use Scenario: Amplifying mV-level output from silicon piezoresistive pressure sensors in portable blood pressure monitors. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with dual-channel configuration for ratiometric bridge excitation and differential sensing. Use Value: 15 µV offset and 20 nV/°C drift ensure <0.1% FS error over temperature - meeting ISO 81060-2 clinical accuracy requirements. | Use Scenario: Linearizing and amplifying output from platinum RTD (PT100) sensors in HVAC thermostats. IC Role / Device Role / Timing Role: Low-power, high-impedance buffer and gain stage in 3-wire RTD measurement circuits with constant-current excitation. Use Value: 250 GΩ input resistance prevents RTD self-heating errors; 13 µA supply current extends battery life to >5 years in wireless thermostat nodes. |
| Electronic scales | Medical instrumentation |
Use Scenario: Signal conditioning for micro-strain gauge bridges in handheld digital kitchen scales. IC Role / Device Role / Timing Role: Dual-channel amplifier providing excitation buffering and bridge output amplification in compact PCB layouts. Use Value: 140 dB channel separation isolates excitation and sense paths - eliminating bridge imbalance errors caused by crosstalk. | Use Scenario: Front-end amplification for ECG electrode signals in wearable patch monitors. IC Role / Device Role / Timing Role: Ultra-low-noise, micropower op amp in right-leg drive (RLD) and lead-I differential amplification stages. Use Value: 95 nV/√Hz voltage noise density and 1.96 µVp-p (0.1–10 Hz) enable clean acquisition of sub-µV cardiac signals without cooling or shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8629ARZ | Higher supply current (1.2 mA vs. 13 µA), wider supply range (2.7–18 V), lower noise (0.2 µVp-p), but not 1.8 V compatible. | Suitable for line-powered medical devices requiring lower noise, not battery-operated systems. | Select AD8629ARZ only when 1.8 V operation is unnecessary and sub-microvolt noise dominates design priorities. |
| LTC2050CMS8#PBF | Similar micropower (15 µA) and zero-drift architecture, but higher offset (25 µV max), lower CMRR (100 dB), and no guaranteed 125°C operation. | Fits cost-sensitive industrial sensors where extended temperature range is not required. | Choose LTC2050CMS8#PBF for budget-constrained designs accepting 2× offset and reduced thermal robustness. |
Compared with AD8629ARZ and LTC2050CMS8#PBF, ADA4051-2ACPZ-R7 uniquely combines 1.8 V operation, 15 µV max offset, and −40°C to +125°C qualification - making it the only option for ultra-low-voltage, high-precision, wide-temperature embedded sensing.
Availability
ADA4051-2ACPZ-R7 is available at Aetrix Electronics and suitable for battery-powered equipment, medical instrumentation, electronic scales, and handheld test equipment requiring stable component supply across automotive, industrial, and consumer product lifecycles.
Supply support for ADA4051-2ACPZ-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.
The ADA4051 family was designed specifically for micropower, high-precision signal conditioning in resource-constrained environments - targeting battery-operated sensors, portable diagnostics, and industrial IoT edge nodes where accuracy must not compromise energy efficiency.
FAQ
What is the operating temperature range for the ADA4051-2ACPZ-R7?
The ADA4051-2ACPZ-R7 is specified for operation from −40°C to +125°C, fully qualified across this extended industrial temperature range. This allows deployment in harsh environments such as automotive engine compartments, industrial motor drives, and outdoor environmental monitoring systems without performance degradation or derating.
Does the ADA4051-2ACPZ-R7 support true rail-to-rail input and output at 1.8 V?
Yes, the ADA4051-2ACPZ-R7 provides rail-to-rail input common-mode range (0 V to 1.8 V) and rail-to-rail output swing (VOL ≤ 3 mV, VOH ≥ 1.796 V at 1.8 V). This enables full utilization of the supply rail in single-supply, low-voltage systems - critical for interfacing directly with 1.8 V ADCs and microcontrollers.
How does the ADA4051-2ACPZ-R7 achieve zero-drift performance without increasing in-band noise?
The ADA4051-2ACPZ-R7 uses a patented autocorrection feedback (ACFB) chopper architecture that nulls offset in the DC domain instead of filtering ripple in the AC domain. This avoids aliasing artifacts and maintains flat 95 nV/√Hz voltage noise density up to 40 kHz - delivering true zero-drift without sacrificing signal-to-noise ratio.
What is the recommended PCB layout practice for the exposed pad on the ADA4051-2ACPZ-R7 LFCSP package?
Analog Devices specifies that the exposed pad of the ADA4051-2ACPZ-R7 (CP-8-13) must be soldered to the PCB's V– plane using ≥4 thermal vias. This achieves the rated θJA of 55°C/W on a 2-layer JEDEC board and minimizes thermal drift and output offset variation caused by localized heating.
Can the ADA4051-2ACPZ-R7 drive capacitive loads without instability?
The ADA4051-2ACPZ-R7 is unity-gain stable and characterized for CL = 100 pF with 40° phase margin. For loads >100 pF, a series resistor (≥100 Ω) between the output and capacitance is recommended to maintain stability - confirmed in Figure 25 and Figure 28 of the Rev. C datasheet.
ADA4051-2ACPZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Chopper (Zero-Drift)
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.06V/µs
- Gain Bandwidth Product:
- 125 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 pA
- Voltage - Input Offset:
- 2 µV
- Current - Supply:
- 13µA (x2 Channels)
- Current - Output / Channel:
- 15 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-LFCSP (3x3)
ADA4051-2ACPZ-R7 FAQ
1.How can I place an order for ADA4051-2ACPZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4051-2ACPZ-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 ADA4051-2ACPZ-R7 reliable?
The price and inventory of ADA4051-2ACPZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4051-2ACPZ-R7 is usually 5 days.
3.What payment methods are accepted for ADA4051-2ACPZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4051-2ACPZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4051-2ACPZ-R7?
ADA4051-2ACPZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4051-2ACPZ-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 ADA4051-2ACPZ-R7?
For technical support, including ADA4051-2ACPZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4051-2ACPZ-R7 requirements.
6.How does Aetrix verify that ADA4051-2ACPZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADA4051-2ACPZ-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 ADA4051-2ACPZ-R7 meets industry standards.
7.What is the process for return or replacement of ADA4051-2ACPZ-R7?
All ADA4051-2ACPZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADA4051-2ACPZ-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 ADA4051-2ACPZ-R7 part is unused and in its original packaging.
Return procedure for ADA4051-2ACPZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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