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Analog Devices Inc. AD844ANZ
- Part No.:
- AD844ANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD844ANZ.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,209
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Product details
Overview
AD844ANZ from Analog Devices is a current-feedback operational amplifier optimized for high-speed current-to-voltage conversion and inverting-mode amplification, delivering 60 MHz bandwidth at gain = −1, 2000 V/μs slew rate, 100 ns settling to 0.1%, and differential gain/phase error of 0.03% / 0.16° at 4.4 MHz - used in flash ADC input stages and video cable drivers.
For engineers reviewing the AD844ANZ datasheet, AD844ANZ pinout, AD844ANZ application, or AD844ANZ equivalent, this page provides verified circuit role (current-feedback op amp), package mapping (8-lead PDIP), thermal and supply range (−40°C to +85°C), key ac/dc specs, and two validated alternative parts with documented technical differences.
Technical Context
The AD844ANZ implements a current-feedback architecture where closed-loop bandwidth depends primarily on feedback resistor value-not gain-enabling stable 60 MHz operation at gain = −1 and 33 MHz at gain = −10. Its inverting input presents ~50 Ω impedance, enabling fast transient response independent of output swing.
It features laser-trimmed dc performance: max 150 μV offset voltage (B grade), 6.5 mA quiescent current, ±4.5 V to ±18 V dual supply operation, and short-circuit protection to 80 mA. The transresistance is 2.2–3.0 MΩ with 4.5 pF transcapacitance, defining its stability boundary via RF·Ct.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (Gain = −1) | 60 MHz - 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 Vp-p pulse response with 100 ns settling to 0.1% without slew-induced distortion |
| Full Power BW | 20 MHz at 20 Vp-p, RL = 500 Ω - delivers undistorted large-signal output across broadcast video bandwidth |
| Input Offset Voltage | 150 μV max (B grade) - ensures low dc error in precision I-V conversion for high-speed DAC interfaces |
| Supply Range | ±4.5 V to ±18 V - supports flexible system-level power design including ±5 V and ±15 V rails |
| Output Drive | ±10 V into 500 Ω, ±2.5 V into 50 Ω - directly drives terminated coaxial cables and flash ADC sampling inputs |
| Settling Time | 100 ns to 0.1% (10 V step) - meets timing requirements for sub-10 ns aperture jitter in 50+ MSPS flash ADC front-ends |
Pinout & Package
AD844ANZ is housed in an 8-lead plastic dual in-line package (PDIP, N suffix), rated for industrial temperature range (−40°C to +85°C). Pin 1 is null, Pin 2 is inverting input (−IN), Pin 3 is noninverting input (+IN), Pin 4 is negative supply (−VS), Pin 5 is transimpedance node (TZ), Pin 6 is output, Pin 7 is positive supply (+VS), and Pin 8 is null.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | Null | No internal connection; must be left unconnected or grounded per layout best practice |
| 2 | Inverting Input (−IN) | Low-impedance (~50 Ω) current-summing node; defines feedback path and bandwidth via RF |
| 3 | Noninverting Input (+IN) | High-impedance (>7 MΩ) voltage reference node; used for noninverting gain configurations ≥10 |
| 4 | Negative Supply (−VS) | Accepts −4.5 V to −18 V; requires local 0.1 µF bypass capacitor to ground |
| 5 | Transimpedance Node (TZ) | Internal high-gain node; not user-accessible; sets dominant pole with transcapacitance (4.5 pF) |
| 6 | Output | Capable of ±10 V into 500 Ω or ±2.5 V into 50 Ω; short-circuit protected to 80 mA |
| 7 | Positive Supply (+VS) | Accepts +4.5 V to +18 V; requires local 0.1 µF bypass capacitor to ground |
Key Features
| Feature | Design Value |
|---|---|
| Current-feedback architecture | Enables gain-independent bandwidth: 60 MHz at G = −1, 33 MHz at G = −10 - eliminates traditional GBW trade-off |
| Ultrafast settling | 100 ns to 0.1% for 10 V step - supports high-speed data acquisition with minimal aperture uncertainty |
| Laser-trimmed dc accuracy | 150 μV max offset, 1 μV/°C drift - maintains precision in I-V conversion over industrial temperature range |
| Video-optimized linearity | 0.03% differential gain / 0.16° differential phase at 4.4 MHz - meets NTSC/PAL broadcast video fidelity requirements |
| Robust output stage | Drives 50 Ω loads to ±2.5 V with low THD (<0.005% @ 100 kHz) and built-in 80 mA short-circuit protection |
Applications
| Flash ADC Front-End | Video Cable Driver |
|---|---|
Use Scenario: Amplifying analog input signals prior to sampling by a 50+ MSPS flash ADC in test equipment or digital oscilloscopes. IC Role / Device Role / Timing Role: Current-feedback op amp configured as unity-gain inverting buffer with 60 MHz bandwidth and 100 ns settling. Use Value: Preserves transient fidelity of fast-rising edges; eliminates slewing artifacts that would corrupt LSB accuracy in high-resolution converters. |
Use Scenario: Driving 75 Ω coaxial video lines in broadcast monitors or camera interface modules operating at 4.4 MHz baseband. IC Role / Device Role / Timing Role: High-speed voltage buffer with 0.03% differential gain error and 0.16° phase error at 4.4 MHz. Use Value: Maintains color fidelity and sync integrity across long cable runs without requiring external peaking networks. |
| High-Speed DAC Interface | Pulse Amplifier |
Use Scenario: Converting current output from a 100+ MSPS current-steering DAC into a single-ended voltage signal for RF upconversion. IC Role / Device Role / Timing Role: Precision current-to-voltage converter using external RF, leveraging 50 Ω inverting input impedance to reject DAC output capacitance effects. Use Value: Eliminates stability degradation caused by DAC output capacitance (up to 15 pF), enabling flat frequency response to 60 MHz. |
Use Scenario: Amplifying nanosecond-scale pulses in time-of-flight sensors, laser diode drivers, or pulse generator outputs. IC Role / Device Role / Timing Role: Fast-settling inverting amplifier with 2000 V/μs slew rate and 100 ns 0.1% settling for 10 V steps. Use Value: Delivers accurate pulse amplitude and edge timing without overshoot or ringing, critical for sub-ns timing resolution. |
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 | 300 MHz GBW, 3000 V/μs slew, 2.5 mA IQ, SO-8 package only - no PDIP option | Better bandwidth but higher noise (2.8 nV/√Hz vs. 2.0 nV/√Hz); less suitable for low-distortion video due to higher THD | Select when >60 MHz bandwidth is required and SO-8 footprint is acceptable; verify layout for 300 MHz stability |
| THS3091D | 210 MHz bandwidth, 2750 V/μs slew, ±15 V max supply, 12 mA IQ, SO-8 package - no PDIP | Higher drive capability (±250 mA) but larger offset (2 mV) and no laser trim; unsuitable for precision I-V conversion | Prefer for high-current pulse amplification where dc accuracy is secondary; avoid in flash ADC front-ends requiring <200 μV offset |
Compared with LM6172IMX/NOPB and THS3091D, AD844ANZ offers superior dc precision (150 μV offset), proven video linearity (0.03%/0.16°), and PDIP packaging for legacy prototyping - making it uniquely suited for industrial-grade, mixed-signal systems demanding both speed and accuracy.
Availability
AD844ANZ is available at Aetrix Electronics and suitable for flash ADC front-ends, video cable drivers, and high-speed DAC interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD844ANZ 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, with design and manufacturing expertise spanning over 50 years.
The AD844 belongs to Analog Devices' high-speed current-feedback op amp product line, engineered specifically for applications demanding simultaneous wide bandwidth, fast settling, low distortion, and precision dc performance - especially in data acquisition and video signal chains.
FAQ
What is the maximum operating temperature range for AD844ANZ?
The AD844ANZ is rated for the industrial temperature range of −40°C to +85°C. This specification is confirmed in the Ordering Guide and Absolute Maximum Ratings tables of the Rev. G datasheet. The 'N' suffix denotes 8-lead PDIP packaging, and the 'A' grade indicates industrial temperature qualification. Operation outside this range may result in parametric shift or reliability risk.
Does AD844ANZ support noninverting configurations?
Yes, AD844ANZ supports noninverting configurations, but with performance limitations: optimal results require gain ≥10, input transients kept below ±1 V, and careful compensation (e.g., capacitor across R2). At G = +10, bandwidth reaches 30 MHz; at G = +100, bandwidth extends to 900 MHz with peaking capacitor. Noninverting use below G = 10 degrades large-signal response.
What is the purpose of the TZ pin (Pin 5) on AD844ANZ?
Pin 5 (TZ) is the internal transimpedance node - not user-accessible. It is the high-gain internal node where feedback current develops voltage before buffering. Its 4.5 pF transcapacitance (Ct) forms the dominant stability-determining time constant with the external feedback resistor (RF). Users must never connect or load Pin 5; doing so will disrupt internal biasing and cause malfunction.
Can AD844ANZ drive a 50 Ω load directly?
Yes, AD844ANZ can drive a 50 Ω load directly, delivering ±2.5 V with low distortion and short-circuit protection to 80 mA. The datasheet confirms this capability in the Output Characteristics table and Figure 16/21 pulse response plots with RL = 50 Ω. For sustained 50 Ω operation, ensure adequate PCB copper area and thermal relief to manage power dissipation.
How does AD844ANZ differ from a conventional voltage-feedback op amp?
AD844ANZ uses current-feedback architecture: its inverting input presents ~50 Ω impedance (not virtual ground), bandwidth depends on RF not gain, and it has no classical slew rate limit - rise/fall times remain constant across output swing. Unlike voltage-feedback op amps, its closed-loop response is set by RF·Ct, not open-loop gain roll-off, enabling 60 MHz at G = −1 without instability.
AD844ANZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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 pA
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AD844ANZ FAQ
1.How can I place an order for AD844ANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD844ANZ 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 AD844ANZ reliable?
The price and inventory of AD844ANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD844ANZ is usually 5 days.
3.What payment methods are accepted for AD844ANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD844ANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD844ANZ?
AD844ANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD844ANZ 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 AD844ANZ?
For technical support, including AD844ANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD844ANZ requirements.
6.How does Aetrix verify that AD844ANZ is sourced from the original manufacturer or authorized distributors?
All AD844ANZ 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 AD844ANZ meets industry standards.
7.What is the process for return or replacement of AD844ANZ?
All AD844ANZ units undergo pre-shipment inspection (PSI). If there is an issue with AD844ANZ, 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 AD844ANZ part is unused and in its original packaging.
Return procedure for AD844ANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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