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Analog Devices Inc. AD781JNZ
- Part No.:
- AD781JNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD781JNZ.pdf
- Description:
- IC SAMPL/HOLD 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:284
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Product details
Overview
AD781JNZ from Analog Devices is a monolithic sample-and-hold amplifier (SHA) designed for high-speed, high-accuracy data acquisition systems. It achieves 12-bit accuracy with ≤700 ns acquisition time for a 10 V step to 0.01%, features ±5 V input range, 4 MHz small-signal bandwidth, and operates on ±12 V supplies with 6.5 mA typical supply current. It is used as front-end signal conditioning ahead of 12-bit ADCs such as the AD674 in multichannel instrumentation.
For engineers reviewing the AD781JNZ datasheet, AD781JNZ pinout, AD781JNZ application, or AD781JNZ equivalent, key selection considerations include aperture jitter (75 ps typ), hold mode offset (–4 mV to +3 mV), droop rate (0.01–1 µV/µs), THD (–90 dB at 10 kHz), and compatibility with ±12 V dual-supply systems requiring low-noise, self-contained sampling without external hold capacitors.
Technical Context
The AD781JNZ implements a proprietary self-correcting architecture that actively compensates for charge injection, gain error, and offset after the hold command-enabling accurate held output despite non-linear sample-mode behavior. Its internal hold capacitor eliminates external component requirements, and single-ended I/O referenced to COMMON simplifies system integration.
It delivers fast hold settling (≤500 ns to 1 mV), low feedthrough (–86 dB at 100 kHz), and stable DC performance over temperature (hold mode offset drift ≤10 µV/°C). The device is optimized for interfacing with 12-bit successive-approximation ADCs where timing precision, low distortion, and minimal droop are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Acquisition Time (to 0.01%) | 600–700 ns - enables ≥1 MSPS throughput in multichannel DAQ systems when paired with compatible ADCs |
| Small Signal Bandwidth | 4 MHz - supports accurate sampling of signals up to ~2.5 MHz before 3 dB attenuation |
| Aperture Jitter | 75 ps typ - limits SNR degradation to ≤0.5 LSB error at input frequencies up to ~100 kHz |
| Hold Mode Offset | –4 mV to +3 mV - defines absolute DC accuracy floor; stable over temperature (≤10 µV/°C drift) |
| Total Output Noise | 150 µV rms (DC–5 MHz) - contributes directly to effective resolution loss in cascaded ADC stages |
| Input Impedance | 50 MΩ - requires low-impedance drive (<5 kΩ recommended) to minimize crosstalk and acquisition error |
| Power Supply Range | ±10.8 V to ±13.2 V - supports standard ±12 V rails with ±10% tolerance; PSRR >70 dB |
Pinout & Package
AD781JNZ is housed in an 8-pin plastic DIP (N-8) package with through-hole mounting and 0.3-inch body width. Pin 1 is VCC (+12 V), Pin 2 is analog input (IN), Pin 3 is COMMON (signal ground reference), Pins 4 and 7 are no-connect (NC), Pin 5 is analog output (OUT), Pin 6 is sample/hold control (S/H), and Pin 8 is VEE (–12 V).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply rail | Must be decoupled with 0.1 µF ceramic capacitor to COMMON; powers internal amplifier and switch circuitry |
| IN (Pin 2) | Analog input node | Single-ended, ±5 V full-scale range; requires low-impedance source to limit acquisition error and crosstalk |
| COMMON (Pin 3) | Signal reference ground | Unified analog/digital return path; must connect directly to ADC analog ground with dedicated trace |
| NC (Pins 4, 7) | No internal connection | Not bonded; must remain unconnected-no routing or pull-up/pull-down allowed |
| OUT (Pin 5) | Held analog output | Drives ADC input directly; capable of ±5 mA output current with <2.5 mV offset shift |
| S/H (Pin 6) | Digital control input | Active-high TTL/CMOS-compatible signal; initiates hold mode transition with defined setup/hold timing |
| VEE (Pin 8) | Negative supply rail | Must be decoupled with 0.1 µF ceramic capacitor to COMMON; establishes negative headroom for bipolar operation |
Key Features
| Feature | Design Value |
|---|---|
| On-chip hold capacitor | Eliminates need for external capacitor and associated layout sensitivity or trimming adjustments |
| Self-correcting architecture | Compensates for charge injection, gain, and offset errors post-hold command-improving DC accuracy without calibration |
| Low feedthrough (–86 dB) | Minimizes coupling of dynamic input transients into held output during hold mode-critical for multiplexed inputs |
| High PSRR (70–80 dB) | Rejects supply noise across frequency range, preserving signal integrity in noisy industrial power environments |
| ESD-protected digital inputs | Withstands electrostatic discharge per MIL-STD-883; reduces risk of field failure during handling or board assembly |
Applications
| High-Speed Data Acquisition | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Simultaneous sampling of multiple sensor channels in automated test equipment operating at ≥500 kSPS. IC Role / Device Role / Timing Role: Front-end sample-and-hold stage synchronizing analog inputs prior to digitization by a 12-bit SAR ADC. Use Value: 700 ns acquisition time and 500 ns hold settling enable tight inter-channel timing alignment without added delay logic. |
Use Scenario: Precision waveform capture in benchtop oscilloscopes and spectrum analyzers requiring low distortion and high SNR. IC Role / Device Role / Timing Role: Signal conditioning block preceding high-resolution ADCs to preserve spectral purity and minimize aperture uncertainty. Use Value: 75 ps aperture jitter and –90 dB THD at 10 kHz ensure >11.5 ENOB in FFT-based measurements. |
| Industrial Process Monitoring | Medical Imaging Signal Chain |
|
Use Scenario: Continuous monitoring of voltage/current outputs from PLC analog I/O modules in factory automation systems. IC Role / Device Role / Timing Role: Isolating and stabilizing analog sensor outputs before conversion in real-time control loops. Use Value: Stable hold mode offset (<±3 mV) and low droop rate (0.01 µV/µs) maintain DC accuracy over extended hold periods. |
Use Scenario: Digitizing analog outputs from ultrasound beamformer ICs or MRI gradient amplifiers with strict linearity requirements. IC Role / Device Role / Timing Role: High-fidelity sampling stage ensuring minimal harmonic distortion and intermodulation artifacts in diagnostic imaging. Use Value: –78 dB third-order IMD and 72 dB SINAD at 10 kHz support accurate reconstruction of complex biomedical waveforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sample-and-hold amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LF398N | Slower acquisition (10 µs), higher offset (±5 mV), no internal capacitor-requires external 0.01 µF hold cap | Lower cost, lower speed systems where 12-bit accuracy at <100 kSPS is sufficient | Select LF398N only if budget constraints outweigh need for speed, integrated capacitance, and tighter DC specs. |
| HA-5350-5 | Faster acquisition (250 ns), wider supply range (±18 V), but higher power (25 mA) and no self-correction architecture | High-voltage industrial DAQ requiring >±12 V headroom and sub-microsecond settling | Choose HA-5350-5 when input swing exceeds ±5 V or when faster acquisition dominates over power and calibration simplicity. |
Compared with LF398N and HA-5350-5, AD781JNZ uniquely combines integrated hold capacitance, self-correcting offset/gain compensation, and 700 ns acquisition within a ±12 V, 6.5 mA power envelope-making it optimal for compact, calibrated 12-bit data acquisition where layout simplicity and repeatability are critical.
Availability
AD781JNZ is available at Aetrix Electronics and suitable for high-speed data acquisition, test & measurement instrumentation, industrial process monitoring, and medical imaging signal chains requiring stable component supply and long-term obsolescence management.
Supply support for AD781JNZ 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, founded in 1965 and headquartered in Wilmington, MA.
The AD781 belongs to Analog Devices' precision sample-and-hold amplifier product line, engineered specifically for 12-bit data acquisition systems demanding low aperture jitter, high DC accuracy, and minimal external component count.
FAQ
What is the maximum input voltage range supported by the AD781JNZ?
The AD781JNZ supports an analog input voltage range of ±5 V, referenced to the COMMON pin. Absolute maximum ratings allow input voltages from –12 V to +12 V, but specified performance-including linearity and offset-is guaranteed only over the ±5 V range. Exceeding ±5 V may degrade nonlinearity and increase THD beyond datasheet limits.
Does the AD781JNZ require an external hold capacitor?
No, the AD781JNZ does not require an external hold capacitor. It integrates a precision on-chip hold capacitor as part of its monolithic design, eliminating external component dependencies, layout sensitivity, and trimming requirements. This integration is confirmed in the Functional Description section of the AD781 datasheet Rev. A.
What is the role of the COMMON pin on the AD781JNZ?
The COMMON pin on the AD781JNZ serves as the unified reference ground for analog input, held output, and digital S/H control return. It is not split into separate analog and digital grounds. Proper design requires connecting COMMON directly to the ADC's analog ground with a dedicated low-inductance trace, while also tying it to the system's digital ground at the ADC location to avoid ground loops.
Can the AD781JNZ drive an ADC input directly without a buffer amplifier?
Yes, the AD781JNZ can drive most 12-bit ADC inputs directly due to its ±5 mA output drive capability and low output resistance (0.3–0.5 Ω). However, a buffer is recommended when driving high-capacitance ADC inputs (>20 pF) or when source impedance exceeds 5 kΩ, as higher impedances increase acquisition error and crosstalk per the AD781 datasheet recommendations.
What is the temperature range specification for the AD781JNZ?
The AD781JNZ is rated for operation from 0°C to +70°C, as indicated by the "J" grade in its ordering code. Its electrical specifications-including acquisition time, offset, and THD-are guaranteed across this full industrial temperature range. Hold mode offset drift is specified at ≤10 µV/°C, supporting stable DC performance in ambient-varying environments.
AD781JNZ 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:
- Sample and Hold
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 4 MHz
- Current - Input Bias:
- 50 nA
- Voltage - Input Offset:
- -
- Current - Supply:
- 4mA
- Current - Output / Channel:
- 5 mA
- Voltage - Supply Span (Min):
- 21.6 V
- Voltage - Supply Span (Max):
- 26.4 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AD781JNZ FAQ
1.How can I place an order for AD781JNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD781JNZ 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 AD781JNZ reliable?
The price and inventory of AD781JNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD781JNZ is usually 5 days.
3.What payment methods are accepted for AD781JNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD781JNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD781JNZ?
AD781JNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD781JNZ 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 AD781JNZ?
For technical support, including AD781JNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD781JNZ requirements.
6.How does Aetrix verify that AD781JNZ is sourced from the original manufacturer or authorized distributors?
All AD781JNZ 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 AD781JNZ meets industry standards.
7.What is the process for return or replacement of AD781JNZ?
All AD781JNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD781JNZ, 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 AD781JNZ part is unused and in its original packaging.
Return procedure for AD781JNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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