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Analog Devices Inc. ADA4891-2ARMZ
- Part No.:
- ADA4891-2ARMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADA4891-2ARMZ.pdf
- Description:
- IC CMOS 2 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:903
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Product details
Overview
ADA4891-2ARMZ 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 high-resolution sensor outputs in automotive infotainment and contact image sensor buffers.
For engineers reviewing the ADA4891-2ARMZ datasheet, ADA4891-2ARMZ pinout, ADA4891-2ARMZ application, or ADA4891-2ARMZ equivalent, key selection criteria include its 2.7 V to 5.5 V single-supply operation, 50 mV rail-to-rail output swing, 79 dBc SFDR at 1 MHz, 125 mA linear output current, and guaranteed −40°C to +125°C operation for automotive-grade reliability.
Technical Context
The ADA4891-2ARMZ employs a voltage-feedback architecture with true single-supply capability: its input common-mode range extends 300 mV below the negative rail, and its rail-to-rail output stage swings within 50 mV of both supply rails. This enables full dynamic range utilization in low-voltage, high-bandwidth systems without level-shifting circuitry.
It is specified across 5 V and 3 V operation, maintaining 25 MHz 0.1 dB gain flatness (G = +2, RL = 150 Ω) and <0.25° differential phase error for NTSC video fidelity. Its 9 nV/√Hz input voltage noise and 88 dB CMRR support precision active filtering and photodiode preamplification where signal integrity and DC accuracy are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| −3 dB Bandwidth | 220 MHz at G = +1 (enables wideband video and clock buffer applications) |
| Slew Rate | 170 V/µs (supports clean 2 V step response with minimal distortion) |
| Settling Time | 28 ns to 0.1% (ensures accurate sampling in high-speed ADC driver or multiplexer output stages) |
| Rail-to-Rail Output | Swings within 50 mV of supply rails (maximizes dynamic range on 3 V or 5 V supplies) |
| Supply Range | 2.7 V to 5.5 V (compatible with modern low-voltage embedded and automotive power domains) |
| Quiescent Current | 4.4 mA per amplifier (balances speed and power efficiency for dual-channel designs) |
| Operating Temp | −40°C to +125°C (qualified for under-hood and display module environments) |
Pinout & Package
The ADA4891-2ARMZ is housed in an 8-lead MSOP (RM-8) package with exposed pad for thermal enhancement. 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 unused.
| 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, Amp 1 | Accepts feedback network for stable gain configuration (e.g., G = +2 with RF = 604 Ω) |
| +IN1 | Noninverting input, Amp 1 | High-impedance (5 GΩ) node for sensor or source connection with minimal loading |
| −VS | Negative supply rail | Reference for dual-supply operation; accepts ground or negative voltage down to −0.5 V |
| +IN2 | Noninverting input, Amp 2 | Independent high-Z input for second channel; no crosstalk coupling above −80 dB at 5 MHz |
| −IN2 | Inverting input, Amp 2 | Configurable independently; supports dual-channel active filters or differential receivers |
| OUT2 | Amplifier 2 output | Simultaneous high-speed output; matched AC performance to OUT1 |
| +VS | Positive supply rail | Accepts 2.7–5.5 V; PSRR >65 dB ensures immunity to supply ripple |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 2 (−40°C to +105°C ambient) and extended −40°C to +125°C operation for module-level reliability |
| Video-optimized linearity | 0.05% differential gain / 0.25° differential phase error (NTSC, RL = 150 Ω) ensures broadcast-grade color fidelity |
| Low distortion at 1 MHz | 79 dBc SFDR enables clean signal chain design for CCD/CMOS sensor readout and high-resolution DAC buffering |
| Fast settling & bandwidth | 28 ns to 0.1% with 220 MHz bandwidth allows use in 10+ MSPS data acquisition front-ends |
| Single-supply flexibility | Input extends 300 mV below −VS and output swings to within 50 mV of rails - eliminates need for external biasing networks |
Applications
| Automotive Infotainment Display Driver | Consumer Video Signal Reconstruction |
|---|---|
Use Scenario: Driving RGB signals from SoC video outputs to TFT-LCD timing controller inputs over 150 Ω coaxial traces. IC Role / Device Role / Timing Role: Dual-channel video reconstruction filter and level shifter with gain = +2 configuration. Use Value: 25 MHz 0.1 dB gain flatness and <0.25° phase error preserve color saturation and edge sharpness in 720p/1080p displays. | Use Scenario: Buffering composite video (CVBS) output from media processor to TV SCART or RCA connector. IC Role / Device Role / Timing Role: High-fidelity video amplifier with DC-coupled output and 150 Ω termination. Use Value: 0.05% differential gain error prevents hue shift; rail-to-rail swing maintains full 1 Vpp signal amplitude on 3.3 V supply. |
| Contact Image Sensor (CIS) Channel Buffer | Active Filter for High-Speed ADC Front-End |
Use Scenario: Amplifying analog outputs from 300+ dpi CIS modules used in document scanners and multifunction printers. IC Role / Device Role / Timing Role: Low-noise, low-distortion dual-channel buffer with 9 nV/√Hz input noise and 125 mA drive capability. Use Value: Enables direct connection to 12-bit, 20 MSPS ADC without gain-stage degradation; 28 ns settling ensures pixel clock alignment. | Use Scenario: Implementing 4th-order Butterworth anti-aliasing filter before high-speed SAR ADC in test equipment. IC Role / Device Role / Timing Role: Dual op-amp configured as two 2-pole sections in cascade (MFB topology). Use Value: 220 MHz bandwidth and 170 V/µs slew rate maintain filter group delay flatness up to 10 MHz; low THD preserves SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4897-1ARJZ-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 photodiode preamps; less suitable for dual-channel space-constrained layouts | Select when single-channel performance outweighs dual-channel integration and power budget |
| LMH6629MA/NOPB | Higher slew rate (940 V/µs), wider bandwidth (1.5 GHz), but no rail-to-rail output and higher supply current (15.5 mA) | Preferred for RF/IF gain stages requiring extreme speed; not suitable for low-voltage video reconstruction | Choose only when >1 GHz bandwidth and >500 V/µs slew are mandatory and rail-to-rail output is unnecessary |
Compared with ADA4897-1ARJZ-R7 and LMH6629MA/NOPB, the ADA4891-2ARMZ uniquely balances dual-channel integration, rail-to-rail output, automotive temperature range, and 4.4 mA/channel power - making it optimal for cost-sensitive, space-constrained video and imaging systems where fidelity and supply flexibility are prioritized over ultimate bandwidth or noise floor.
Availability
ADA4891-2ARMZ is available at Aetrix Electronics and suitable for automotive infotainment systems, contact image sensor modules, and high-speed active filter designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADA4891-2ARMZ 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 automotive video, imaging, and industrial sensing - delivering rail-to-rail output, wide supply range, and video-grade linearity in compact MSOP/SOIC packages.
FAQ
What is the maximum operating temperature for the ADA4891-2ARMZ?
The ADA4891-2ARMZ is fully specified from −40°C to +125°C and qualified for automotive applications. Its extended temperature range ensures reliable operation in under-dash infotainment modules and engine bay sensor interfaces where ambient temperatures exceed 105°C. The device's thermal resistance (θJA = 133°C/W for MSOP) supports stable junction temperature management under typical PCB layout conditions.
Does the ADA4891-2ARMZ support single-supply operation with input signals near ground?
Yes, the ADA4891-2ARMZ supports true single-supply operation: its input common-mode voltage range extends to −VS − 0.3 V, allowing inputs down to −0.3 V when −VS = 0 V (i.e., ground-referenced system). This enables direct interfacing with ground-referenced sensors or DACs without external level-shifting circuitry - a key advantage over conventional amplifiers with limited input range.
What is the recommended feedback resistor value for G = +2 configuration with the ADA4891-2ARMZ?
The ADA4891-2ARMZ datasheet specifies RF = 604 Ω for G = +2 configurations in 5 V operation (RL = 150 Ω). This value optimizes 0.1 dB gain flatness (25 MHz) and minimizes peaking. For 3 V operation, the same RF value is applicable; however, stability margin increases slightly due to reduced slew-induced nonlinearities. Always use 1% tolerance metal-film resistors and place them close to the inverting input.
Can the ADA4891-2ARMZ drive a 150 Ω coaxial cable directly?
Yes, the ADA4891-2ARMZ is explicitly characterized driving 150 Ω loads (e.g., video lines) with G = +2, delivering 25 MHz 0.1 dB gain flatness, 0.05% differential gain error, and 0.25° differential phase error. Its 125 mA linear output current and rail-to-rail swing ensure full 2 Vpp signal compliance into 150 Ω while maintaining NTSC/PAL video fidelity - eliminating need for external line drivers in most consumer and automotive video paths.
Is the ADA4891-2ARMZ pin-compatible with other devices in the ADA4891 family?
No - the ADA4891-2ARMZ (dual, 8-pin MSOP/SOIC) is not pin-compatible with the ADA4891-1 (5-pin SOT-23 or 8-pin SOIC), ADA4891-3 (14-pin SOIC/TSSOP), or ADA4891-4 (14-pin SOIC/TSSOP). Each variant has distinct pin counts, layouts, and terminal assignments. The ADA4891-2ARMZ shares identical pinout between its SOIC_N and MSOP packages, but differs from all other family members in both pin count and function mapping.
ADA4891-2ARMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
ADA4891-2ARMZ FAQ
1.How can I place an order for ADA4891-2ARMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4891-2ARMZ 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 reliable?
The price and inventory of ADA4891-2ARMZ 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 is usually 5 days.
3.What payment methods are accepted for ADA4891-2ARMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4891-2ARMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4891-2ARMZ?
ADA4891-2ARMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4891-2ARMZ 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?
For technical support, including ADA4891-2ARMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4891-2ARMZ requirements.
6.How does Aetrix verify that ADA4891-2ARMZ is sourced from the original manufacturer or authorized distributors?
All ADA4891-2ARMZ 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 meets industry standards.
7.What is the process for return or replacement of ADA4891-2ARMZ?
All ADA4891-2ARMZ units undergo pre-shipment inspection (PSI). If there is an issue with ADA4891-2ARMZ, 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 part is unused and in its original packaging.
Return procedure for ADA4891-2ARMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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