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Analog Devices Inc. AD844JRZ-16-REEL7
- Part No.:
- AD844JRZ-16-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD844JRZ-16-REEL7.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
AD844JRZ-16-REEL7 from Analog Devices is a current-feedback operational amplifier optimized for high-speed inverting-mode amplification and current-to-voltage conversion. It delivers 60 MHz bandwidth at gain = −1, 2000 V/μs slew rate, 100 ns settling to 0.1%, and drives 50 Ω loads with low distortion - enabling use in flash ADC front-ends and video cable drivers.
For engineers reviewing the AD844JRZ-16-REEL7 datasheet, AD844JRZ-16-REEL7 pinout, AD844JRZ-16-REEL7 application, or AD844JRZ-16-REEL7 equivalent, key selection criteria include transresistance stability, feedback resistor–dependent bandwidth, inverting input impedance (50 Ω), and absence of classical slew-rate limiting in large-signal response.
Technical Context
The AD844JRZ-16-REEL7 employs a current-feedback architecture with a low-impedance inverting input (≈50 Ω) and high-impedance noninverting input (≈10 MΩ). Its closed-loop bandwidth is set primarily by the external feedback resistor-not gain ratio-enabling stable 60 MHz operation at gain = −1 with RF = 500 Ω.
Internally, it uses a transresistance stage (Rt ≈ 3 MΩ) and transcapacitance (Ct = 4.5 pF) to define open-loop dynamics; the TZ pin (Pin 5) serves as the high-slew-rate node where output voltage is generated before buffering, bypassing traditional voltage-feedback slew limitations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small Signal Bandwidth | 60 MHz at gain = −1: enables full-spectrum video signal amplification up to 4.4 MHz with <0.03% differential gain error. |
| Slew Rate | 2000 V/μs: supports clean 20 V step response in ≤100 ns without slewing artifacts. |
| Settling Time | 100 ns to 0.1% (10 V step): ensures accurate sampling in flash ADC interfaces with minimal aperture uncertainty. |
| Input Impedance (−IN) | 50 Ω: defines stable, predictable feedback network behavior independent of loop gain. |
| Transresistance (Rt) | 2.2–3.0 MΩ: sets DC gain accuracy and limits closed-loop transimpedance error to <0.07% with RF ≤ 2 kΩ. |
| Full Power BW | 20 MHz (20 Vp-p, RL = 500 Ω): sustains undistorted large-signal output across broadcast video baseband. |
| Differential Phase Error | 0.16° at 4.4 MHz: meets NTSC/PAL timing fidelity requirements for analog video routing. |
Pinout & Package
AD844JRZ-16-REEL7 is housed in a 16-lead SOIC (RW) package with exposed pad (RoHS-compliant, tape-and-reel). Pin 1 is located at the top-left corner when the notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 13, 16 | No Connect (NC) | Internally unconnected; must remain floating or grounded per layout guidelines to avoid parasitic coupling. |
| 2 | Inverting Input (−IN) | Low-impedance (50 Ω) current-summing node; determines bandwidth via feedback resistor value. |
| 3 | Noninverting Input (+IN) | High-impedance (10 MΩ) voltage-input node; requires <±1 V transient swing for stable noninverting operation. |
| 5 | Transimpedance Node (TZ) | Internal high-slew node where output voltage is generated; not user-accessible but critical to AC response. |
| 6 | Output | Capable of ±11 V into 500 Ω or ±2.5 V into 50 Ω with THD <0.005% at 100 kHz. |
| 7 | Positive Supply (+VS) | Accepts +4.5 V to +18 V; supplies output buffer and current mirrors. |
| 8 | Negative Supply (−VS) | Accepts −4.5 V to −18 V; symmetric supply required for rail-to-rail output swing. |
| 9–12 | No Connect (NC) | Unused die pads; electrically isolated and thermally inert. |
Key Features
| Feature | Design Value |
|---|---|
| Current-feedback architecture | Enables bandwidth independent of closed-loop gain-60 MHz achievable at gain = −1 without compensation. |
| Laser-trimmed offset voltage | ≤150 μV (B-grade spec) minimizes DC error in precision I-V conversion for DAC interfaces. |
| 50 Ω inverting input impedance | Eliminates stability dependence on source impedance; allows direct termination of coaxial video lines. |
| 2000 V/μs slew rate | Delivers full 20 V output swing in <10 ns-critical for pulse amplifiers and fast-settling data acquisition. |
| Short-circuit protection | Withstands indefinite 80 mA output fault current without latch-up or parametric shift. |
Applications
| Flash ADC Front-End | Video Cable Driver |
|---|---|
Use Scenario: Amplifying analog input prior to sampling in 8–10-bit flash ADCs operating at ≥20 MSPS. IC Role / Device Role / Timing Role: High-fidelity, low-aperture-error buffer with 100 ns settling to 0.1% and 60 MHz small-signal BW. Use Value: Preserves SNR and ENOB by minimizing dynamic distortion and time-domain uncertainty during sampling window. | Use Scenario: Driving 75 Ω coaxial video cables in broadcast equipment or test instrumentation. IC Role / Device Role / Timing Role: Unity-gain inverting driver with 0.03% differential gain and 0.16° phase error at 4.4 MHz. Use Value: Maintains color fidelity and sync integrity over long cable runs without external equalization. |
| High-Speed DAC Output Buffer | Pulse Amplifier |
Use Scenario: Converting current-mode outputs of high-speed DACs (e.g., 100+ MSPS) to single-ended voltage signals. IC Role / Device Role / Timing Role: Current-to-voltage converter with 50 Ω virtual ground, rejecting DAC output capacitance effects. Use Value: Eliminates RFCstray pole instability-enables clean 20 MHz full-power response even with 15 pF DAC capacitance. | Use Scenario: Amplifying narrow, high-amplitude pulses (e.g., laser diode drivers, time-of-flight sensors). IC Role / Device Role / Timing Role: Fast, low-overshoot inverting amplifier with 100 ns 0.1% settling and 2000 V/μs slew capability. Use Value: Delivers precise pulse edge timing and amplitude fidelity without slew-induced pulse width distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM6172IMX/NOPB | Lower bandwidth (100 MHz GBW vs. AD844's 60 MHz at G = −1); higher input bias current (1.2 μA vs. 200 nA typ); no dedicated TZ node. | Better suited for wideband noninverting gain > +10; less optimal for precision I-V conversion due to higher IB. | Select LM6172IMX/NOPB when higher small-signal bandwidth and dual-channel integration are prioritized over ultra-low DC error. |
| THS3091D | Higher slew rate (7300 V/μs); wider supply range (±5 V to ±15 V); higher quiescent current (11 mA vs. 6.5 mA); different pinout (8-pin SOIC). | Preferred for extreme pulse fidelity and driving capacitive loads >1000 pF; not drop-in compatible due to pin count and layout. | Choose THS3091D only when 7300 V/μs slew and 210 MHz full-power bandwidth justify increased power and PCB redesign. |
Compared with LM6172IMX/NOPB and THS3091D, the AD844JRZ-16-REEL7 offers superior DC precision (150 μV max VOS), lower input bias current, and proven video differential gain/phase performance-making it the preferred choice for cost-sensitive, high-fidelity analog signal conditioning where 60 MHz bandwidth suffices.
Availability
AD844JRZ-16-REEL7 is available at Aetrix Electronics and suitable for flash ADC interfaces, video routing systems, high-speed DAC buffers, and pulse amplification requiring stable component supply across industrial temperature ranges (0°C to 70°C).
Supply support for AD844JRZ-16-REEL7 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 AD844JRZ-16-REEL7 belongs to Analog Devices' legacy high-speed current-feedback op amp family, designed specifically for applications demanding wide bandwidth, fast settling, and precision current-to-voltage conversion without classical slew-rate limitations.
FAQ
What is the maximum recommended feedback resistor value for stable operation of the AD844JRZ-16-REEL7?
The AD844JRZ-16-REEL7 achieves optimal stability and bandwidth with feedback resistors between 500 Ω and 2 kΩ. Values above 5 kΩ reduce bandwidth significantly and risk overdamped response; values below 500 Ω increase sensitivity to stray capacitance and may cause peaking. For gain = −1, RF = 500 Ω yields 60 MHz bandwidth and clean 100 ns pulse response. Always verify layout parasitics when using RF < 500 Ω.
Can the AD844JRZ-16-REEL7 be used in noninverting configurations, and what are the limitations?
Yes, the AD844JRZ-16-REEL7 supports noninverting operation, but with constraints: gain should be ≥+10 to maintain bandwidth >30 MHz, and input transients must stay within ±1 V to avoid distortion. At low gains (<+5), bandwidth collapses and pulse response degrades due to input-stage slew limitations. Figure 23 in the AD844 datasheet shows a validated +10 configuration; for higher gains, add a peaking capacitor across R2 to extend bandwidth.
Does the AD844JRZ-16-REEL7 require external compensation components for unity-gain stability?
No, the AD844JRZ-16-REEL7 is internally compensated for unity-gain stability in inverting mode. Its current-feedback architecture eliminates the need for dominant-pole compensation. Stability depends solely on selecting appropriate feedback and gain-setting resistors-RF = 500 Ω and RG = 500 Ω yield stable 60 MHz response. Avoid excessive capacitance at the inverting input (>2 pF) or output (>10 pF) unless compensated per Figure 29 guidelines.
What is the purpose of the TZ pin (Pin 5) on the AD844JRZ-16-REEL7, and can it be accessed externally?
The TZ (Transimpedance) pin (Pin 5) is the internal node where the output voltage is generated before buffering-it is not user-accessible and must remain unconnected. This node hosts the 4.5 pF transcapacitance and is driven directly by high-speed current mirrors, enabling the AD844JRZ-16-REEL7's 2000 V/μs slew rate. External access would compromise stability and void specifications; all external connections must follow the standard 8-pin or 16-pin SOIC interface diagrams in the datasheet.
How does the AD844JRZ-16-REEL7 handle capacitive loads, and what is the maximum safe value?
The AD844JRZ-16-REEL7 drives moderate capacitive loads directly: up to 100 pF into 500 Ω is stable with no isolation resistor. For loads >100 pF (e.g., long cables or ADC input capacitance), insert a 10–47 Ω series resistor between OUTPUT and load to isolate the capacitance. The datasheet confirms stable operation with 1000 pF when using this technique-critical for driving flash ADCs with >20 pF input capacitance while preserving 100 ns settling.
AD844JRZ-16-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2000V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 60 MHz
- Current - Input Bias:
- 200 nA
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 6.5mA
- Current - Output / Channel:
- 80 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
AD844JRZ-16-REEL7 FAQ
1.How can I place an order for AD844JRZ-16-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD844JRZ-16-REEL7 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 AD844JRZ-16-REEL7 reliable?
The price and inventory of AD844JRZ-16-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD844JRZ-16-REEL7 is usually 5 days.
3.What payment methods are accepted for AD844JRZ-16-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD844JRZ-16-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD844JRZ-16-REEL7?
AD844JRZ-16-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD844JRZ-16-REEL7 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 AD844JRZ-16-REEL7?
For technical support, including AD844JRZ-16-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD844JRZ-16-REEL7 requirements.
6.How does Aetrix verify that AD844JRZ-16-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD844JRZ-16-REEL7 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 AD844JRZ-16-REEL7 meets industry standards.
7.What is the process for return or replacement of AD844JRZ-16-REEL7?
All AD844JRZ-16-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD844JRZ-16-REEL7, 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 AD844JRZ-16-REEL7 part is unused and in its original packaging.
Return procedure for AD844JRZ-16-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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