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Analog Devices Inc. ADA4891-2ARMZ-RL
- Part No.:
- ADA4891-2ARMZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADA4891-2ARMZ-RL.pdf
- Description:
- IC CMOS 2 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,540
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Product details
Overview
ADA4891-2ARMZ-RL from Analog Devices is a dual, CMOS, rail-to-rail output voltage feedback amplifier optimized for high-speed video and imaging signal conditioning. It delivers 220 MHz −3 dB bandwidth (G = +1), 170 V/μs slew rate, and 28 ns settling to 0.1%, operating from 2.7 V to 5.5 V single supply in automotive-grade temperature range (−40°C to +125°C). It is used in consumer video reconstruction, CCD buffer stages, and coaxial cable drivers.
For engineers reviewing the ADA4891-2ARMZ-RL datasheet, ADA4891-2ARMZ-RL pinout, ADA4891-2ARMZ-RL application, or ADA4891-2ARMZ-RL equivalent, key selection criteria include its 25 MHz 0.1 dB gain flatness at G = +2, 0.05% differential gain error, rail-to-rail output swing within 50 mV of rails, 4.4 mA per amplifier quiescent current, and MSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The ADA4891-2ARMZ-RL employs a voltage-feedback architecture with true single-supply operation and input common-mode range extending 300 mV below the negative rail. Its rail-to-rail output stage supports full dynamic range utilization across 2.7 V–5.5 V supplies, while low distortion (−79 dBc SFDR at 1 MHz) and fast settling enable precision analog signal paths in active filters and multiplexed imaging systems.
It features matched dual-channel performance with <±3.1 mV input offset voltage over temperature, 9 nV/√Hz input voltage noise at 1 MHz, and 88 dB CMRR - enabling accurate differential signal handling without external trimming. The device lacks power-down pins (unlike ADA4891-3), confirming fixed dual-amplifier operation in all variants bearing the "-2" suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 220 MHz at G = +1 (enables HD video signal amplification up to ~1080p timing) |
| Slew Rate | 170 V/μs (supports clean 2 V step response in ≤28 ns, critical for pulse fidelity) |
| Settling Time | 28 ns to 0.1% (ensures minimal transient error in high-speed sampling or multiplexing) |
| Output Swing | Within 50 mV of rails (maximizes signal headroom on 3.3 V or 5 V supplies) |
| Supply Range | 2.7 V to 5.5 V single supply (compatible with modern low-voltage SoC I/O domains) |
| Quiescent Current | 4.4 mA per amplifier (balances speed and power for battery-sensitive or thermally constrained designs) |
| Differential Gain Error | 0.05% at NTSC, RL = 150 Ω (meets broadcast-grade video linearity requirements) |
| Input Voltage Noise | 9 nV/√Hz at 1 MHz (low-noise performance suitable for photodiode preamp front ends) |
Pinout & Package
The ADA4891-2ARMZ-RL is housed in an 8-lead MSOP (RM-8) package, measuring 3.0 mm × 3.0 mm × 0.85 mm, with exposed pad for thermal enhancement. Pin 1 is marked by a dot; pin numbering follows standard MSOP convention (counterclockwise from mark).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 | Amplifier 1 output | Drives load directly; rail-to-rail swing supports full-scale signal delivery |
| –IN1 | Inverting input of Amp 1 | Accepts feedback network; high 5 GΩ input resistance minimizes loading |
| +IN1 | Noninverting input of Amp 1 | High-impedance node for signal source connection; 3.2 pF input capacitance affects high-Z source stability |
| –VS | Negative supply rail | Ground reference for single-supply operation; input extends 0.3 V below this rail |
| +VS | Positive supply rail | Accepts 2.7–5.5 V; PSRR of 65 dB reduces supply ripple coupling into output |
| OUT2 | Amplifier 2 output | Independent output channel; matched AC/DC specs enable dual-path signal processing |
| –IN2 | Inverting input of Amp 2 | Electrically isolated from Amp 1 inputs; crosstalk <−80 dB at 5 MHz ensures channel separation |
| +IN2 | Noninverting input of Amp 2 | Same input structure as +IN1; enables identical configuration for both channels |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output | Swings within 50 mV of supply rails, preserving >96% of available voltage headroom at 3.3 V |
| Video-optimized linearity | 0.05% differential gain / 0.25° phase error meets NTSC/PAL broadcast standards |
| Low power, high speed | Delivers 220 MHz bandwidth with only 4.4 mA per amplifier - 50× faster than typical 4 mA op-amps |
| Automotive qualified | Specified and tested over −40°C to +125°C, supporting AEC-Q100-relevant reliability in infotainment ECUs |
| High output drive | 125 mA linear output current enables direct driving of 150 Ω coaxial cables or multiple 1 kΩ loads |
| Low input bias current | ±50 pA max enables high-impedance sensor interfaces (e.g., photodiodes, piezoelectric elements) without significant offset drift |
Applications
| Consumer Video Reconstruction | CCD Image Sensor Buffer |
|---|---|
Use Scenario: Reconstructing composite video signals after DAC output in set-top boxes or DVD players. IC Role / Device Role / Timing Role: High-fidelity video amplifier with 25 MHz 0.1 dB gain flatness and low group delay variation. Use Value: Maintains color fidelity (0.05% differential gain error) and sync timing integrity across NTSC/PAL bandwidths. | Use Scenario: Buffering analog pixel outputs from linear CCD arrays in document scanners or industrial inspection cameras. IC Role / Device Role / Timing Role: Low-noise, fast-settling gain stage placed immediately after CCD output to preserve SNR and pixel timing. Use Value: 9 nV/√Hz input noise and 28 ns settling minimize smear and crosstalk between adjacent pixels. |
| Coaxial Cable Driver | Active Filter Stage |
Use Scenario: Driving 75 Ω or 150 Ω coaxial cables in automotive rear-seat entertainment or camera video links. IC Role / Device Role / Timing Role: High-current output driver (125 mA) with stable gain flatness to 25 MHz over cable impedance. Use Value: Eliminates need for external emitter followers or discrete buffers, reducing BOM count and layout area. | Use Scenario: Implementing 2nd-order Sallen-Key or MFB filter topologies in medical imaging or test equipment front ends. IC Role / Device Role / Timing Role: High GBW, low-distortion amplifier enabling sharp roll-off and minimal passband ripple. Use Value: −79 dBc SFDR at 1 MHz ensures harmonic contamination does not mask low-level diagnostic signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, rail-to-rail amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4897-1ARZ-R7 | Single-channel, lower noise (4.5 nV/√Hz), higher GBP (1 GHz), but higher quiescent current (12.5 mA) | Better for ultra-low-noise preamp stages; less suitable for dual-channel, power-constrained video routing | Select when noise dominates over power or channel count; not drop-in for dual-path designs |
| LMH6629MA/NOPB | Higher slew rate (1000 V/μs), wider bandwidth (1.5 GHz), but no rail-to-rail output and higher supply current (12.5 mA) | Preferred for RF/IF signal chains requiring extreme speed; unsuitable for single-supply, rail-swing-critical video | Choose for wideband non-video applications where output swing to rails is not required |
Compared with ADA4891-2ARMZ-RL, ADA4897-1ARZ-R7 trades dual-channel integration and low power for superior noise and bandwidth, while LMH6629MA/NOPB sacrifices rail-to-rail output and efficiency for raw speed - making ADA4891-2ARMZ-RL optimal for cost-sensitive, dual-channel, single-supply video and imaging systems.
Availability
ADA4891-2ARMZ-RL is available at Aetrix Electronics and suitable for automotive infotainment systems, consumer video equipment, and industrial imaging modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADA4891-2ARMZ-RL 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 Wilmington, MA.
The ADA4891 family was designed specifically for cost-sensitive, high-speed analog signal conditioning in imaging, video, and active filter applications - emphasizing rail-to-rail output, low power, and automotive-grade reliability without sacrificing bandwidth or linearity.
FAQ
What is the operating temperature range for ADA4891-2ARMZ-RL?
The ADA4891-2ARMZ-RL is specified to operate from −40°C to +125°C, meeting extended temperature requirements for automotive infotainment and under-hood sensor signal conditioning. This range is validated per AEC-Q100 stress testing protocols and applies across all electrical parameters in the datasheet's "5 V Operation" and "3 V Operation" tables. ADA4891-2ARMZ-RL maintains 220 MHz bandwidth and 28 ns settling time across this full range.
Does ADA4891-2ARMZ-RL support true single-supply operation with input below ground?
Yes, ADA4891-2ARMZ-RL supports true single-supply operation with an input common-mode voltage range extending 300 mV below the negative rail (−VS − 0.3 V). When powered from a 3.3 V supply with −VS = 0 V, the input accepts signals down to −0.3 V - enabling DC-coupled interfacing with bipolar sources or level-shifted sensors without external biasing. This capability is confirmed in the "Input Common-Mode Voltage Range" specification on page 4 of the Rev. F datasheet.
What is the maximum capacitive load drive capability of ADA4891-2ARMZ-RL?
ADA4891-2ARMZ-RL can safely drive up to 47 pF capacitive loads while maintaining stability and 0.1 dB gain flatness, as verified in Figure 27 of the Rev. F datasheet. With no series resistor, it remains unconditionally stable into purely capacitive loads ≤22 pF. For larger loads (e.g., 100 pF), a small series isolation resistor (10–22 Ω) at the output is recommended to prevent peaking. This behavior is consistent across both amplifiers in the ADA4891-2ARMZ-RL dual package.
Is ADA4891-2ARMZ-RL pin-compatible with other members of the ADA4891 family?
No, ADA4891-2ARMZ-RL is not pin-compatible with ADA4891-1, ADA4891-3, or ADA4891-4 due to differing channel counts and pin functions. The ADA4891-2ARMZ-RL uses an 8-pin MSOP with dedicated dual-amplifier I/O (OUT1/–IN1/+IN1/–VS/+VS/OUT2/–IN2/+IN2); ADA4891-1 is 5- or 8-pin, ADA4891-3/4 are 14-pin with disable pins (PD1–PD3). Pin mapping is unique to each variant - always verify against Figure 3 (MSOP/SOIC for ADA4891-2) in the datasheet before layout.
What package type is used for ADA4891-2ARMZ-RL, and does it include thermal enhancement?
ADA4891-2ARMZ-RL is supplied in an 8-lead MSOP (RM-8) package measuring 3.0 mm × 3.0 mm × 0.85 mm, with an exposed thermal pad on the underside. This pad must be soldered to a PCB copper pour for optimal thermal performance - the datasheet specifies θJA = 133°C/W on a JEDEC-standard 4-layer board when the pad is properly connected. The "ARMZ" suffix explicitly denotes the MSOP package with tape-and-reel (RL) packaging for automated assembly.
ADA4891-2ARMZ-RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-MSOP
ADA4891-2ARMZ-RL FAQ
1.How can I place an order for ADA4891-2ARMZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4891-2ARMZ-RL 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 ADA4891-2ARMZ-RL reliable?
The price and inventory of ADA4891-2ARMZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4891-2ARMZ-RL is usually 5 days.
3.What payment methods are accepted for ADA4891-2ARMZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4891-2ARMZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4891-2ARMZ-RL?
ADA4891-2ARMZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4891-2ARMZ-RL 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 ADA4891-2ARMZ-RL?
For technical support, including ADA4891-2ARMZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4891-2ARMZ-RL requirements.
6.How does Aetrix verify that ADA4891-2ARMZ-RL is sourced from the original manufacturer or authorized distributors?
All ADA4891-2ARMZ-RL 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 ADA4891-2ARMZ-RL meets industry standards.
7.What is the process for return or replacement of ADA4891-2ARMZ-RL?
All ADA4891-2ARMZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with ADA4891-2ARMZ-RL, 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 ADA4891-2ARMZ-RL part is unused and in its original packaging.
Return procedure for ADA4891-2ARMZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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