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Analog Devices Inc. ADA4805-1ARJZ-R2
- Part No.:
- ADA4805-1ARJZ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
ADA4805-1ARJZ-R2.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,564
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Product details
Overview
ADA4805-1ARJZ-R2 from Analog Devices is a single-channel, rail-to-rail output, voltage-feedback operational amplifier optimized for low-power, high-resolution data acquisition systems. It delivers 105 MHz −3 dB bandwidth (G = +1, 5 V supply), 160 V/µs slew rate, and 125 µV max input offset voltage, with ultralow 500 µA quiescent current per amplifier - enabling use in battery-powered ADC drivers and micropower active filters.
For engineers reviewing the ADA4805-1ARJZ-R2 datasheet, ADA4805-1ARJZ-R2 pinout, ADA4805-1ARJZ-R2 application, or ADA4805-1ARJZ-R2 equivalent, key selection criteria include dynamic power scaling via shutdown pin (3 µs turn-on), 0.2 µV/°C typical offset drift, rail-to-rail output swing (0.02 V to 4.98 V on 5 V supply), and validated performance driving SAR ADCs such as AD7980.
Technical Context
The ADA4805-1ARJZ-R2 employs Analog Devices' proprietary XFCB process to simultaneously achieve low voltage noise (5.9 nV/√Hz at 100 kHz) and low current noise (0.6 pA/√Hz), supporting precision signal conditioning in wide-bandwidth, low-voltage systems. Its input common-mode range extends from −0.1 V to +4 V on 5 V supply, and it features an active-low SHUTDOWN pin that reduces quiescent current to 2.9 µA while maintaining 3 µs full settling turn-on time.
This amplifier is fully specified across ±1.5 V to ±5 V dual supplies and 3 V/5 V single supplies, with guaranteed operation from −40°C to +125°C. The device supports dynamic power management by enabling/disabling between ADC sampling cycles, making it suitable for time-interleaved or duty-cycled high-resolution conversion architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 105 MHz at G = +1, 5 V supply - enables accurate amplification of fast transients in 1 MSPS+ SAR ADC front-ends. |
| Slew Rate | 160 V/µs - ensures faithful reproduction of large-signal steps without distortion in ADC driver applications. |
| Quiescent Current | 500 µA per amplifier - allows >100-hour operation on a 50 mAh coin cell in intermittent-use instrumentation. |
| Input Offset Voltage | 125 µV maximum - contributes ≤0.002% gain error in 16-bit ADC reference buffer configurations. |
| Offset Drift | 0.2 µV/°C typical - limits temperature-induced error to <3 µV over 0°C–70°C industrial range. |
| SHUTDOWN Turn-On Time | 3 µs maximum - permits synchronous activation just before ADC sample window, minimizing idle power. |
| Output Swing | Rail-to-rail: 0.02 V to 4.98 V (RL = 2 kΩ, 5 V supply) - maximizes dynamic range into ADC inputs referenced to ground or mid-supply. |
Pinout & Package
The ADA4805-1ARJZ-R2 is housed in a 6-lead SOT-23 package (JEDEC MO-178AA), with exposed pad not electrically connected. Thermal resistance θJA is 209.1°C/W on a standard 4-layer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOUT | Amplifier output node; drives ADC input or filter network with rail-to-rail capability and 58 mA linear output current. |
| 2 | −VS | Negative supply terminal; accepts −1.5 V to −5 V or ground in single-supply mode; must be decoupled locally. |
| 3 | +IN | Noninverting input; high-impedance (50 MΩ common-mode), supports DC-coupled sensor interfaces. |
| 4 | −IN | Inverting input; used for unity-gain buffer or inverting configuration; matched to +IN for CMRR >103 dB. |
| 5 | SHUTDOWN | Active-low enable control; <1.5 V disables amplifier (IQ = 2.9 µA); >1.9 V enables full operation. |
| 6 | +VS | Positive supply terminal; accepts 2.7 V to 10 V total supply range; requires 0.1 µF ceramic bypass to −VS. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Power Scaling | SHUTDOWN pin reduces IQ from 500 µA to 2.9 µA with 3 µs wake-up - enables energy-proportional operation synchronized to ADC sampling. |
| Low Noise Architecture | XFCB process delivers 5.9 nV/√Hz voltage noise and 0.6 pA/√Hz current noise at 100 kHz - preserves SNR in high-gain, wideband signal chains. |
| Rail-to-Rail Output | Swings within 20 mV of rails on 5 V supply - maximizes usable input range for 16-bit+ SAR ADCs like AD7980. |
| Wide Supply Range | Operates from ±1.5 V to ±5 V dual or 3 V/5 V single supplies - supports portable, industrial, and mixed-voltage systems. |
| Industrial Temp Grade | Specified from −40°C to +125°C - ensures stable offset, bandwidth, and distortion in uncontrolled environments. |
Applications
| High-Resolution SAR ADC Driver | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Driving the AD7980 16-bit, 1 MSPS SAR ADC in a portable data logger powered by a 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: Single-ended to pseudo-differential driver with 35 ns 0.1% settling; activated only during 100 ns ADC aperture window via SHUTDOWN. Use Value: Enables 91 dB SINAD while consuming <5 µA average current over 1 kSPS sampling, extending battery life beyond 1 year. |
Use Scenario: Front-end amplifier in a handheld gas detector using electrochemical sensors with µV-level output signals. IC Role / Device Role / Timing Role: Low-drift, low-noise gain stage preceding a 18-bit sigma-delta ADC; operates continuously but at 500 µA to preserve resolution. Use Value: 0.2 µV/°C drift and 5.9 nV/√Hz noise maintain sub-ppm measurement stability across operating temperature range. |
| Micropower Active Filter | ADC Reference Buffer |
Use Scenario: 2nd-order anti-aliasing filter in a wireless sensor node transmitting vibration data at 10 kSPS. IC Role / Device Role / Timing Role: Dual-role amplifier implementing Sallen-Key topology; powered continuously but biased at minimum IQ. Use Value: 105 MHz bandwidth supports filter cutoff up to 100 kHz with <0.1 dB passband ripple, while drawing only 500 µA. |
Use Scenario: Buffering the ADR435 5 V precision reference for multiple ADCs in an industrial PLC analog input module. IC Role / Device Role / Timing Role: Unity-gain voltage follower isolating reference from switching loads; maintains 125 µV max offset and 107 dB open-loop gain. Use Value: Prevents reference droop and noise coupling, ensuring <±0.002% gain error across all 16-bit channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4807-1ARMZ | Higher quiescent current (1.2 mA), wider bandwidth (225 MHz), no shutdown pin. | Better for continuous high-speed buffering; unsuitable where dynamic power gating is required. | Select ADA4807-1ARMZ when sustained bandwidth >200 MHz is needed and shutdown functionality is unnecessary. |
| OPA320AIDBVR | Lower noise (4.5 nV/√Hz), lower IQ (170 µA), but only 10 MHz bandwidth and no shutdown. | Optimized for ultra-low-noise, ultra-low-power DC/low-frequency sensing - not viable for >1 MSPS ADC drive. | Select OPA320AIDBVR for sub-100 kHz precision sensor interfaces where bandwidth is secondary to noise and power. |
Compared with ADA4807-1ARMZ and OPA320AIDBVR, the ADA4805-1ARJZ-R2 uniquely balances 105 MHz bandwidth, 500 µA IQ, and 3 µs shutdown wake-up - making it the only option among the three for duty-cycled, high-resolution, battery-constrained ADC driver designs.
Availability
ADA4805-1ARJZ-R2 is available at Aetrix Electronics and suitable for high-resolution SAR ADC drivers, battery-powered instrumentation, and micropower active filters requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADA4805-1ARJZ-R2 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 ADA4805 family was designed specifically for low-power, high-bandwidth signal conditioning in precision data acquisition systems - emphasizing dynamic power scaling, rail-to-rail output, and robust performance across industrial temperature ranges.
FAQ
What is the maximum supply voltage for ADA4805-1ARJZ-R2?
The ADA4805-1ARJZ-R2 has an absolute maximum supply voltage rating of 11 V total (i.e., +VS − (−VS) ≤ 11 V). It is fully specified for operation from ±1.5 V to ±5 V dual supplies and 3 V or 5 V single supplies. Exceeding 11 V risks permanent damage per Absolute Maximum Ratings Table 5 in the datasheet.
Does ADA4805-1ARJZ-R2 support rail-to-rail input?
No, ADA4805-1ARJZ-R2 does not support rail-to-rail input. Its input common-mode voltage range is −0.1 V to +4 V on a 5 V supply (−VS − 0.1 V to +VS − 1 V generally), meaning the inputs cannot swing to either rail. Input signals must remain within this range to avoid phase reversal or increased distortion.
What is the purpose of the SHUTDOWN pin on ADA4805-1ARJZ-R2?
The SHUTDOWN pin on ADA4805-1ARJZ-R2 is an active-low control that reduces quiescent current from 500 µA to 2.9 µA. When pulled below 1.5 V (5 V supply), the amplifier enters low-power state; when pulled above 1.9 V, it fully enables with 3 µs turn-on time - enabling precise power gating synchronized to ADC sampling events.
Can ADA4805-1ARJZ-R2 drive capacitive loads?
Yes, ADA4805-1ARJZ-R2 is characterized to drive up to 15 pF capacitive load with ≤30% overshoot (per Table 4 and Figure 14). For larger loads, external isolation resistance (e.g., 226 Ω series resistor) is recommended to maintain stability, especially in ADC input buffer configurations where stray capacitance may exceed 10 pF.
Is ADA4805-1ARJZ-R2 suitable for driving 18-bit ADCs?
Yes, ADA4805-1ARJZ-R2 is validated for driving 16-bit and 18-bit SAR ADCs including AD7982 and AD7984. Its 105 MHz bandwidth, 35 ns 0.1% settling time, low 125 µV offset, and 0.2 µV/°C drift ensure minimal code-dependent errors and thermal drift in high-resolution systems - provided layout minimizes noise coupling and supply impedance.
ADA4805-1ARJZ-R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 160V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 105 MHz
- Current - Input Bias:
- 470 nA
- Voltage - Input Offset:
- 9 µV
- Current - Supply:
- 500µA
- Current - Output / Channel:
- 73 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 10 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
ADA4805-1ARJZ-R2 FAQ
1.How can I place an order for ADA4805-1ARJZ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4805-1ARJZ-R2 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 ADA4805-1ARJZ-R2 reliable?
The price and inventory of ADA4805-1ARJZ-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4805-1ARJZ-R2 is usually 5 days.
3.What payment methods are accepted for ADA4805-1ARJZ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4805-1ARJZ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4805-1ARJZ-R2?
ADA4805-1ARJZ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4805-1ARJZ-R2 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 ADA4805-1ARJZ-R2?
For technical support, including ADA4805-1ARJZ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4805-1ARJZ-R2 requirements.
6.How does Aetrix verify that ADA4805-1ARJZ-R2 is sourced from the original manufacturer or authorized distributors?
All ADA4805-1ARJZ-R2 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 ADA4805-1ARJZ-R2 meets industry standards.
7.What is the process for return or replacement of ADA4805-1ARJZ-R2?
All ADA4805-1ARJZ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with ADA4805-1ARJZ-R2, 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 ADA4805-1ARJZ-R2 part is unused and in its original packaging.
Return procedure for ADA4805-1ARJZ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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