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Analog Devices Inc. ADA4891-2ARZ
- Part No.:
- ADA4891-2ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADA4891-2ARZ.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:929
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Product details
Overview
ADA4891-2ARZ from Analog Devices is a dual, CMOS, rail-to-rail output, high-speed voltage feedback amplifier optimized for video, imaging, and high-fidelity signal conditioning. It delivers 220 MHz −3 dB bandwidth (G = +1), 170 V/µs slew rate, and settles to 0.1% in 28 ns - enabling precise reconstruction of fast video transients and CCD/CMOS sensor outputs in automotive infotainment and driver assistance systems.
For engineers reviewing the ADA4891-2ARZ datasheet, ADA4891-2ARZ pinout, ADA4891-2ARZ application, or ADA4891-2ARZ equivalent, this page provides verified specifications, SOIC-8 package layout, real-world video and filter use cases, and two validated alternative amplifiers with documented functional trade-offs.
Technical Context
The ADA4891-2ARZ employs a voltage-feedback architecture with true single-supply operation (2.7 V to 5.5 V) and input common-mode range extending 300 mV below the negative rail. Its rail-to-rail output swings within 50 mV of both supply rails under 1 kΩ load, maximizing dynamic range in low-voltage systems.
It features low distortion (−79 dBc SFDR at 1 MHz), 9 nV/√Hz input voltage noise, and 0.05% differential gain / 0.25° differential phase error (NTSC, G = +2, RL = 150 Ω), meeting broadcast-grade video line driving requirements without external clamping or DC restoration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 220 MHz at G = +1 (enables full HD video passband up to 1080p60 without attenuation) |
| Slew Rate | 170 V/µs (supports clean 2 V step response in ≤28 ns for fast imaging pulses) |
| Output Swing | Within 50 mV of rails at 1 kΩ (preserves >98% of 5 V supply dynamic range) |
| Supply Range | 2.7 V to 5.5 V (compatible with 3.3 V and 5 V logic domains without level shifting) |
| Quiescent Current | 4.4 mA per amplifier (enables dual-channel operation at <9 mA total for power-sensitive designs) |
| Differential Gain/Phase | 0.05% / 0.25° (meets NTSC/PAL video fidelity specs without post-processing correction) |
| Input Voltage Noise | 9 nV/√Hz at 1 MHz (minimizes added noise in photodiode preamp and contact image sensor buffers) |
Pinout & Package
ADA4891-2ARZ is housed in an 8-lead SOIC_N (R-8) package with exposed pad (RoHS-compliant, JEDEC MS-012). Pin 1 is OUT1, Pin 2 is –IN1, Pin 3 is +IN1, Pin 4 is –VS, Pin 5 is +IN2, Pin 6 is –IN2, Pin 7 is OUT2, and Pin 8 is +VS. No pins are internally connected or NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 | Amplifier 1 output | Drives 150 Ω coaxial loads directly; rail-to-rail swing supports full-swing video signals |
| –IN1 | Inverting input, Amp 1 | High-impedance node (5 GΩ); accepts wide common-mode range (−VS − 0.3 V to +VS − 0.8 V) |
| +IN1 | Non-inverting input, Amp 1 | Matches –IN1 impedance; enables unity-gain buffer or precision gain configurations |
| –VS | Negative supply rail | Supports single-supply (ground-referenced) or split-supply (±2.5 V) operation |
| +IN2 | Non-inverting input, Amp 2 | Independent channel; identical AC/DC specs to Amp 1 for dual-path signal chains |
| –IN2 | Inverting input, Amp 2 | Enables independent feedback network design per channel without crosstalk degradation |
| OUT2 | Amplifier 2 output | Simultaneous dual-channel drive capability; all-hostile crosstalk −80 dB at 5 MHz |
| +VS | Positive supply rail | Accepts 2.7–5.5 V; PSRR = 65 dB (positive) / 63 dB (negative) ensures supply noise rejection |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings to within 50 mV of both supply rails under 1 kΩ load - preserves maximum signal headroom in 3.3 V systems |
| Low distortion | −79 dBc SFDR at 1 MHz (G = +1) - maintains signal integrity in active filters and video reconstruction stages |
| Fast settling | 28 ns to 0.1% for 2 V step (G = +2) - meets timing budgets for high-frame-rate imaging sensors |
| Video-optimized specs | 0.05% differential gain / 0.25° differential phase (NTSC) - eliminates need for external calibration in consumer video paths |
| Wide supply range | Operates from 2.7 V to 5.5 V - supports direct interface with Li-ion battery-powered or USB-powered devices |
Applications
| Automotive Video Signal Conditioning | CCD/CMOS Image Sensor Buffering |
|---|---|
Use Scenario: Driving analog RGB or YPbPr video signals from head unit SoCs to rear-seat displays or ADAS camera monitors over 150 Ω coaxial cables. IC Role / Device Role / Timing Role: Dual-channel video line driver with gain = +2 configuration, providing impedance matching, DC restoration bypass, and transient suppression. Use Value: 0.05% differential gain error ensures color fidelity across temperature (−40°C to +125°C), eliminating hue shift in automotive infotainment displays. | Use Scenario: Buffering high-speed analog outputs from linear CCD arrays or rolling-shutter CMOS sensors in document scanners or industrial inspection cameras. IC Role / Device Role / Timing Role: Low-noise, fast-settling follower or gain stage placed immediately after sensor output to preserve SNR and pixel timing accuracy. Use Value: 9 nV/√Hz input voltage noise and 28 ns settling time prevent smear and ghosting artifacts in high-resolution, high-frame-rate imaging. |
| Active Filter Design | Coaxial Cable Driver for Security Cameras |
Use Scenario: Implementing 4th-order Butterworth or Chebyshev low-pass filters in medical ultrasound front-ends or test equipment signal paths. IC Role / Device Role / Timing Role: Dual op-amp configured as cascaded 2nd-order sections; one amplifier per stage with precise resistor-capacitor networks. Use Value: 220 MHz bandwidth and low distortion enable flat group delay and minimal phase distortion up to 25 MHz - critical for pulse fidelity. | Use Scenario: Driving analog video over long RG-59 coaxial cables (up to 300 m) from security camera modules to DVR inputs in commercial surveillance systems. IC Role / Device Role / Timing Role: Unity-gain stable, current-boosted driver delivering 125 mA peak output into 150 Ω load with minimal overshoot. Use Value: 170 V/µs slew rate and 40 MHz large-signal bandwidth ensure sharp edge preservation in composite video sync pulses and luminance transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4851-2ARMZ | Higher power (9.5 mA/amplifier), lower noise (4.9 nV/√Hz), but narrower bandwidth (105 MHz @ G = +1) | Better for low-noise preamp stages; less suitable for >100 MHz video or fast-settling imaging | Select when SNR dominates over speed; avoid when 220 MHz bandwidth or 28 ns settling is required |
| LMH6629MA/NOPB | Higher slew rate (1000 V/µs), wider bandwidth (1.5 GHz), but higher quiescent current (12.5 mA/amplifier) and no rail-to-rail output | Preferred for RF IF amplification or ultra-fast pulse conditioning; incompatible with single-supply rail-to-rail output needs | Choose only if >1 GHz bandwidth is mandatory and supply headroom allows non-rail-to-rail swing |
Compared with ADA4891-2ARZ, ADA4851-2ARMZ trades bandwidth for noise performance, while LMH6629MA/NOPB sacrifices power efficiency and rail-to-rail operation for extreme speed - making ADA4891-2ARZ optimal for cost-sensitive, low-voltage, video- and imaging-critical dual-channel designs.
Availability
ADA4891-2ARZ is available at Aetrix Electronics and suitable for automotive infotainment systems, imaging sensor interfaces, and active filter designs requiring stable component supply, extended temperature support (−40°C to +125°C), and RoHS-compliant packaging.
Supply support for ADA4891-2ARZ 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 ADA4891 family was designed specifically for cost-sensitive, high-speed signal conditioning in video, imaging, and portable instrumentation - emphasizing rail-to-rail output, low power, and robust AC performance across automotive temperature ranges.
FAQ
What is the operating temperature range for the ADA4891-2ARZ?
The ADA4891-2ARZ is specified for continuous operation from −40°C to +125°C. This extended temperature range is validated per AEC-Q100 stress testing and makes the ADA4891-2ARZ suitable for under-hood automotive applications and industrial environments where thermal cycling is severe. All key parameters - including bandwidth, slew rate, and distortion - are guaranteed across this full range.
Does the ADA4891-2ARZ support single-supply operation?
Yes, the ADA4891-2ARZ fully supports true single-supply operation from 2.7 V to 5.5 V. Its input common-mode range extends 300 mV below the negative rail (e.g., −0.3 V with ground as −VS), and its rail-to-rail output swings to within 50 mV of both supply rails. This enables direct interfacing with 3.3 V microcontrollers and ADCs without level-shifting circuitry.
Can the ADA4891-2ARZ drive a 150 Ω coaxial cable load?
Yes, the ADA4891-2ARZ is explicitly characterized for 150 Ω loads in video applications. At G = +2, it delivers 0.05% differential gain error and 0.25° differential phase error into 150 Ω (NTSC), and sustains 125 mA linear output current. Its 40 MHz large-signal bandwidth ensures minimal rise-time degradation on standard CCTV or automotive video cables.
What is the typical input bias current of the ADA4891-2ARZ?
The typical input bias current of the ADA4891-2ARZ is +2 pA at 25°C, with a guaranteed range of −50 pA to +50 pA over temperature. This ultra-low bias current results from its CMOS input stage and enables high-impedance sensor interfacing - such as photodiode preamplifiers - without significant offset drift or leakage-induced errors.
Is the ADA4891-2ARZ pin-compatible with other members of the ADA4891 family?
No, the ADA4891-2ARZ (dual, SOIC-8/MSOP-8) is not pin-compatible with the ADA4891-1 (SOIC-8/SOT-23-5), ADA4891-3 (SOIC-14/TSSOP-14), or ADA4891-4 (SOIC-14/TSSOP-14). Each variant has distinct pin counts, layouts, and terminal assignments - for example, the ADA4891-2ARZ uses Pins 1–4 and 5–8 for Channel 1 and Channel 2 respectively, while the quad version interleaves inputs and outputs differently.
ADA4891-2ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 210V/µs
- Gain Bandwidth Product:
- 105 MHz
- -3db Bandwidth:
- 90 MHz
- Current - Input Bias:
- 2 pA
- Voltage - Input Offset:
- 2.5 mV
- Current - Supply:
- 4.4mA (x2 Channels)
- Current - Output / Channel:
- 125 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADA4891-2ARZ FAQ
1.How can I place an order for ADA4891-2ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4891-2ARZ 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 ADA4891-2ARZ reliable?
The price and inventory of ADA4891-2ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4891-2ARZ is usually 5 days.
3.What payment methods are accepted for ADA4891-2ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4891-2ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4891-2ARZ?
ADA4891-2ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4891-2ARZ 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 ADA4891-2ARZ?
For technical support, including ADA4891-2ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4891-2ARZ requirements.
6.How does Aetrix verify that ADA4891-2ARZ is sourced from the original manufacturer or authorized distributors?
All ADA4891-2ARZ 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 ADA4891-2ARZ meets industry standards.
7.What is the process for return or replacement of ADA4891-2ARZ?
All ADA4891-2ARZ units undergo pre-shipment inspection (PSI). If there is an issue with ADA4891-2ARZ, 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 ADA4891-2ARZ part is unused and in its original packaging.
Return procedure for ADA4891-2ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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