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Analog Devices Inc. AD8224ACPZ-R7
- Part No.:
- AD8224ACPZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WQFN Exposed Pad, CSP
- Datasheet:
-
AD8224ACPZ-R7.pdf
- Description:
- IC INST AMP 2 CIRCUIT 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,919
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Product details
Overview
AD8224ACPZ-R7 from Analog Devices is a dual-channel, JFET-input instrumentation amplifier in a 4 mm × 4 mm LFCSP package, delivering 10 pA max input bias current, 100 dB min CMRR at G = 10 (B grade), and 1.5 MHz bandwidth at G = 1. It enables high-precision signal conditioning in medical instrumentation and remote sensor interfaces with rail-to-rail output and single-supply operation down to +4.5 V.
For engineers reviewing the AD8224ACPZ-R7 datasheet, AD8224ACPZ-R7 pinout, AD8224ACPZ-R7 application, or AD8224ACPZ-R7 equivalent, key selection considerations include its dual-channel density in compact LFCSP, JFET-input low-current performance, differential-output capability for noise-immune ADC driving, and gain-setting via external resistor across RG pins.
Technical Context
The AD8224ACPZ-R7 integrates two fully independent instrumentation amplifiers sharing supply rails but featuring separate gain-setting resistors (RG1/RG2), reference inputs (REF1/REF2), and outputs (OUT1/OUT2). Each channel uses a three-op-amp topology with JFET input stages to achieve ultra-low input bias current and high common-mode rejection.
It supports both single-ended and differential output configurations - the latter achieved by configuring one amplifier inverted and the other non-inverted with matched gain and reference, enabling high-noise-immunity transmission to differential-input ADCs without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 10 pA max (B grade) - enables high-impedance transducer interfacing without significant DC error. |
| CMRR | 100 dB min at G = 10, DC–60 Hz - rejects interference from noisy industrial or medical sensor environments. |
| Bandwidth | 1.5 MHz at G = 1 - supports fast settling for precision data acquisition up to ~1 MSPS effective throughput. |
| Input Voltage Range | Extends 0.1 V below −VS - allows sensing signals near ground on single-supply systems (e.g., +5 V). |
| Quiescent Current | 750 µA per amplifier - enables battery-powered portable instrumentation with multi-day operation. |
| Supply Range | +4.5 V to +36 V single supply or ±2.25 V to ±18 V dual supply - simplifies power architecture in mixed-voltage systems. |
| Gain Range | G = 1 to 1000 set by single external resistor (G = 1 + 49.4 kΩ/RG) - eliminates trimming and supports flexible system calibration. |
Pinout & Package
The AD8224ACPZ-R7 is housed in a 16-lead, 4 mm × 4 mm LFCSP with exposed thermal pad connected internally to +VS. The package supports routing vias underneath and permits full bias current performance due to hidden paddle construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| −IN1, −IN2 | Negative input of Amp 1 / Amp 2 | Differential input terminals accepting signals referenced to system ground or remote sensor common. |
| +IN1, +IN2 | Positive input of Amp 1 / Amp 2 | High-impedance JFET inputs enabling direct connection to strain gauges, thermocouples, and bridge sensors. |
| RG1, RG2 (pins 2–3, 10–11) | Gain-setting resistor terminals | Paired pins per channel allow Kelvin connection of external gain resistor to minimize parasitic resistance errors. |
| REF1, REF2 | Reference input for Amp 1 / Amp 2 | Set output common-mode voltage independently per channel - critical for driving ratiometric ADCs or level-shifting. |
| OUT1, OUT2 | Amplifier output of Amp 1 / Amp 2 | Rail-to-rail outputs deliver full dynamic range into 2 kΩ loads; support differential output configuration when paired. |
| +VS (pins 5, 16), −VS (pins 8, 13) | Power supply connections | Dual supply pins enable robust decoupling; exposed pad tied to +VS improves thermal performance and PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel density in 4 mm × 4 mm LFCSP | Doubles channel count vs. single-channel IAs without increasing PCB area - reduces BOM cost per channel by >30%. |
| JFET input stage with 10 pA max bias current | Maintains accuracy with high-source-impedance sensors (e.g., pH electrodes, piezoelectric elements) across −40°C to +85°C. |
| Differential output capability | Enables noise-immune signal transmission over cables to differential-input ADCs without external op-amps or matching components. |
| Rail-to-rail output swing | Delivers >95% of supply rail-to-rail range into 2 kΩ - maximizes SNR in low-voltage portable systems (e.g., +5 V battery rails). |
| 4.5 V to 36 V single-supply operation | Eliminates need for dual supplies in field instruments - simplifies power design and reduces component count. |
Applications
| Medical Instrumentation | Precision Data Acquisition |
|---|---|
Use Scenario: Amplifying low-level biopotential signals (ECG, EEG) from dry or gel-based electrodes with high common-mode interference. IC Role / Device Role / Timing Role: Dual-channel IA conditionings two independent lead pairs simultaneously, rejecting 50/60 Hz mains coupling while preserving microvolt-level signal integrity. Use Value: 100 dB CMRR at G = 10 ensures >100× suppression of electrode-skin interface noise; 14 nV/√Hz input noise preserves diagnostic resolution. |
Use Scenario: Digitizing outputs from precision load cells and pressure transducers in automated test equipment. IC Role / Device Role / Timing Role: Front-end IA provides programmable gain (G = 1–1000) and offset adjustment before sigma-delta ADC conversion. Use Value: 0.2% max gain error at G = 10 and 0.8 µV p-p 0.1–10 Hz RTI noise enable 18-bit+ effective resolution in static measurements. |
| Transducer Interfaces | Remote Sensors |
Use Scenario: Conditioning Wheatstone bridge outputs from strain gauges in structural health monitoring systems. IC Role / Device Role / Timing Role: JFET-input IA accepts high-impedance bridge nodes without loading error; REF pins set output baseline for ratiometric ADC referencing. Use Value: Input bias current ≤10 pA prevents bridge imbalance errors; ±2.25 V to ±18 V dual supply accommodates industrial 24 V rails. |
Use Scenario: Transmitting amplified sensor data over long cables in factory automation, where EMI corrupts single-ended signals. IC Role / Device Role / Timing Role: One AD8224ACPZ-R7 channel configured as inverted output, the other non-inverted, forming a true differential output pair. Use Value: Differential output provides >60 dB common-mode noise rejection on cable runs; 4 kV HBM ESD rating protects against field-installation transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8222ARZ | Single-channel, same JFET input architecture, identical gain-setting method, but larger SOIC-8 package and no differential output capability. | Limited to single-sensor channels; lacks dual-channel integration and board-area efficiency of AD8224ACPZ-R7. | Select when only one channel is needed and LFCSP assembly is not supported. |
| INA128UA | Bipolar-input (not JFET), 500 pA typical input bias current, SO-8 package, lower CMRR (110 dB typ at G = 100 but degrades faster with frequency). | Suitable for lower-impedance bridges and less demanding medical peripherals; higher input current limits use with high-Z sources. | Select for cost-sensitive industrial applications where sub-pA bias current is unnecessary and SO-8 footprint is preferred. |
Compared with AD8224ACPZ-R7, AD8222ARZ offers identical precision but halves channel density and increases PCB area by 3.5×, while INA128UA trades JFET-level input performance for broader availability and lower unit cost - making AD8224ACPZ-R7 optimal for space-constrained, high-impedance dual-sensor systems.
Availability
AD8224ACPZ-R7 is available at Aetrix Electronics and suitable for medical instrumentation, precision data acquisition, and remote sensor systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD8224ACPZ-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 AD8224ACPZ-R7 belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for low-power, high-density signal conditioning in portable and remote measurement systems where JFET input performance and dual-channel integration are critical.
FAQ
What is the maximum input common-mode voltage range for AD8224ACPZ-R7 on a +5 V single supply?
On a +5 V single supply (VS− = 0 V), the AD8224ACPZ-R7 supports an input common-mode voltage range from −0.1 V to +3 V (VS − 2 V), as specified in Table 5. This allows interfacing with sensors whose outputs swing slightly below ground or up to 3 V, while maintaining specified input bias current and CMRR performance.
Can AD8224ACPZ-R7 be used in a true differential output configuration, and how is it implemented?
Yes, AD8224ACPZ-R7 supports differential output by configuring one amplifier with non-inverting gain and the other with inverting gain using identical RG resistors and shared REF potential. Figure 64 in the datasheet shows this configuration, enabling noise-immune transmission to differential-input ADCs without external components - a capability not available in most single-channel IAs like AD8222ARZ.
What is the thermal pad connection requirement for AD8224ACPZ-R7, and does it affect electrical performance?
The exposed thermal pad of AD8224ACPZ-R7 is internally connected to +VS. It may be left unconnected or soldered to a +VS copper plane - doing so reduces θJA from 86°C/W to 48°C/W, improving thermal stability and long-term parametric drift. No electrical performance degradation occurs if left unconnected, but thermal derating is required above 70°C ambient.
How does the gain error of AD8224ACPZ-R7 vary with gain setting, and what is the worst-case value?
AD8224ACPZ-R7 gain error is 0.04% max at G = 1 (B grade) and rises to 0.2% max at G = 10, 100, and 1000 (B grade), as shown in Tables 2 and 5. This monotonic increase reflects resistor-matching limitations in the internal gain network - critical for applications requiring <0.1% end-point accuracy at high gains.
Is AD8224ACPZ-R7 qualified for automotive applications, and what is its extended temperature range?
AD8224ACPZ-R7 is characterized for operation from −40°C to +125°C (Table 7, Note 6), but it is not AEC-Q200 qualified. Its specified performance (gain error, CMRR, offset) is guaranteed only from −40°C to +85°C. For automotive under-hood use, additional system-level validation is required - unlike automotive-qualified alternatives such as MAX4462AUB+.
AD8224ACPZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.5 MHz
- Current - Input Bias:
- 25 pA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 750µA (x2 Channels)
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LFCSP (4x4)
AD8224ACPZ-R7 FAQ
1.How can I place an order for AD8224ACPZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8224ACPZ-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 AD8224ACPZ-R7 reliable?
The price and inventory of AD8224ACPZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8224ACPZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8224ACPZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8224ACPZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8224ACPZ-R7?
AD8224ACPZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8224ACPZ-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 AD8224ACPZ-R7?
For technical support, including AD8224ACPZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8224ACPZ-R7 requirements.
6.How does Aetrix verify that AD8224ACPZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8224ACPZ-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 AD8224ACPZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8224ACPZ-R7?
All AD8224ACPZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8224ACPZ-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 AD8224ACPZ-R7 part is unused and in its original packaging.
Return procedure for AD8224ACPZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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