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Analog Devices Inc. AD7820KP-REEL
- Part No.:
- AD7820KP-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-LCC (J-Lead)
- Datasheet:
-
AD7820KP-REEL.pdf
- Description:
- IC ADC 8BIT FLASH 20PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,427
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Product details
Overview
AD7820KP-REEL from Analog Devices is an LC2MOS 8-bit flash analog-to-digital converter with integrated track/hold, 1 µs conversion time, ±0.5 LSB INL, and CMOS/TTL-compatible parallel interface. It operates from a single +5 V supply and targets high-speed data acquisition in instrumentation and digital oscilloscopes.
For engineers reviewing the AD7820KP-REEL datasheet, AD7820KP-REEL pinout, AD7820KP-REEL application, or AD7820KP-REEL equivalent, key selection criteria include conversion speed, track/hold aperture uncertainty, single-supply operation, and microprocessor interface timing compatibility.
Technical Context
The AD7820KP-REEL implements a half-flash (subranging) architecture with internal sample-and-hold, enabling 1 µs full-scale conversion without external hold circuitry. Its LC2MOS process ensures low power consumption (125 mW typical) and high noise immunity.
It features a 3-state parallel output bus compatible with 8080/8085 and Z80 microprocessors, with separate BUSY and RDY signals for handshaking. Input range is 0 V to +5 V (ratiometric to VREF), and reference voltage can be internally derived or externally applied.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete digital codes for medium-speed digitization of analog waveforms |
| Conversion Time | 1 µs - enables sampling rates up to 1 MSPS in burst mode with minimal dead time |
| INL | ±0.5 LSB - ensures monotonicity and <0.2% full-scale linearity error across temperature |
| Supply Voltage | +5 V only - eliminates need for dual supplies or level-shifting in 5 V system designs |
| Power Dissipation | 125 mW typical - supports compact PCB layout without forced air cooling |
| Input Range | 0 V to +5 V (ratiometric) - simplifies sensor interfacing when using same supply as reference |
Pinout & Package
AD7820KP-REEL is housed in a 20-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and standard through-hole footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VANALOG) | Analog Supply | Primary +5 V supply for analog core; requires local 0.1 µF bypass to GND |
| 2 (VDIGITAL) | Digital Supply | +5 V supply for logic interface; separated from analog rail to reduce coupling noise |
| 3 (GND) | Analog Ground | Reference return for analog input and internal circuitry; must be star-connected to minimize offset drift |
| 4 (VIN) | Analog Input | Single-ended 0–5 V input; accepts DC or AC-coupled signals up to 1 MHz bandwidth |
| 5 (VREF) | Reference Input | Accepts external 5 V reference or connects to VANALOG for ratiometric operation |
| 6–13 (DB0–DB7) | Data Bus Outputs | Active-high TTL/CMOS-compatible 8-bit parallel output; tri-stated when CS = high |
| 14 (RDY) | Ready Flag | Active-high open-collector signal indicating conversion completion and data validity |
| 15 (BUSY) | Busy Flag | Active-high open-collector signal asserted during conversion; used for polling or interrupt generation |
| 16 (CS) | Chip Select | Active-low enable for data bus and control logic; required for multi-device bus sharing |
| 17 (WR) | Write Strobe | Active-low edge-triggered command initiating conversion on falling edge |
Key Features
| Feature | Design Value |
|---|---|
| On-chip track/hold amplifier | Eliminates external sample-and-hold IC and associated layout complexity in high-frequency acquisition paths |
| Microprocessor-compatible interface | Direct connection to 8080/8085/Z80 buses without glue logic or level translators |
| Ratiometric reference option | Enables direct interfacing with resistive sensors (e.g., potentiometers) without precision reference ICs |
| LC2MOS process technology | Provides inherent latch-up immunity and stable performance over –40°C to +85°C industrial temperature range |
Applications
| Digital Storage Oscilloscope Front-End | Industrial Data Logger |
|---|---|
Use Scenario: Digitizing analog waveform inputs at up to 1 MSPS for real-time display and storage. IC Role / Device Role / Timing Role: Primary ADC capturing vertical channel signals with sub-microsecond timing resolution. Use Value: 1 µs conversion time and integrated track/hold allow accurate capture of transient events without external hold circuitry. | Use Scenario: Periodic sampling of multiple sensor outputs (temperature, pressure) in factory-floor monitoring systems. IC Role / Device Role / Timing Role: Medium-speed ADC interfaced to microcontroller via parallel bus for deterministic read timing. Use Value: CMOS/TTL-compatible outputs and single +5 V supply simplify integration into legacy 8-bit embedded controllers. |
| Automated Test Equipment (ATE) Channel | Medical Patient Monitor Input Stage |
Use Scenario: High-repetition-rate stimulus-response measurement requiring consistent conversion latency. IC Role / Device Role / Timing Role: ADC in stimulus acquisition path with BUSY/RDY handshaking for precise synchronization. Use Value: Open-collector BUSY and RDY outputs enable clean timing coordination with FPGA or microcontroller sequencers. | Use Scenario: Converting biopotential signals (ECG, EMG) in portable diagnostic devices with strict power constraints. IC Role / Device Role / Timing Role: Low-power 8-bit digitizer operating from shared 5 V rail with ratiometric reference for sensor scaling. Use Value: 125 mW typical dissipation and ratiometric operation reduce component count and improve long-term calibration stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit flash ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7821KP-REEL | Same pinout and timing, but uses external reference only (no internal ratiometric option); slightly lower power (110 mW) | Suitable where reference accuracy is prioritized over supply simplicity | Select AD7821KP-REEL when external precision reference is already present and board space allows dedicated ref IC |
| MAX160BCPP | 10-bit resolution, 2.5 µs conversion, +5 V supply, but no integrated track/hold and different pinout | Used in higher-resolution, lower-speed systems where aperture jitter is less critical | Choose MAX160BCPP only when 10-bit resolution outweighs need for sub-µs timing and integrated hold function |
Compared with AD7820KP-REEL, AD7821KP-REEL offers tighter reference control at the cost of design flexibility, while MAX160BCPP trades speed and integration for resolution-making AD7820KP-REEL optimal for time-critical 8-bit acquisition where simplicity and timing determinism are primary.
Availability
AD7820KP-REEL is available at Aetrix Electronics and suitable for digital oscilloscopes, industrial data loggers, and automated test equipment requiring stable component supply and long-lifecycle support.
Supply support for AD7820KP-REEL 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies.
The AD7820KP-REEL belongs to the AD782X family of half-flash ADCs designed specifically for microprocessor-based data acquisition systems demanding speed, simplicity, and single-supply operation.
FAQ
What is the maximum sampling rate achievable with the AD7820KP-REEL?
The AD7820KP-REEL achieves a maximum sustained sampling rate of 1 MSPS in burst mode, limited by its 1 µs conversion time and minimum inter-conversion delay. Real-world throughput depends on microprocessor bus access time and RDY signal response; for continuous streaming, system-level timing must accommodate CS setup/hold and data read cycles. The AD7820KP-REEL does not support pipelined or interleaved modes.
Does the AD7820KP-REEL require an external reference voltage?
No-the AD7820KP-REEL supports both external reference and ratiometric operation. When VREF is tied to VANALOG, it uses the +5 V supply as reference, enabling direct interfacing with resistive sensors. For improved accuracy, a precision 5.00 V reference may be applied externally. The AD7820KP-REEL does not generate its own reference and lacks internal bandgap or trimming.
Is the AD7820KP-REEL pin-compatible with other members of the AD782X family?
Yes-the AD7820KP-REEL shares identical pinout and timing with AD7821KP-REEL and AD7822KP-REEL, differing only in reference configuration and resolution. This allows hardware reuse across variants. However, AD7820KP-REEL is not pin-compatible with AD7823 or AD7829 due to different package counts and bus structures.
What is the operating temperature range for the AD7820KP-REEL?
The AD7820KP-REEL is specified for industrial operation from –40°C to +85°C. Performance parameters-including INL, conversion time, and power dissipation-are guaranteed across this range per the AD7820 military and commercial data sheets. No derating is required within these limits, and the LC2MOS process ensures stable behavior without thermal shutdown.
Can the AD7820KP-REEL interface directly with modern microcontrollers lacking 8080-style bus timing?
Yes-with appropriate timing adaptation. While the AD7820KP-REEL is optimized for 8080/8085 timing, its RDY and BUSY signals allow synchronization with slower or asynchronous controllers (e.g., ARM Cortex-M). GPIO-driven strobes and polling loops can replicate WR/CS timing; however, the AD7820KP-REEL does not support SPI or I²C natively and requires parallel bus emulation.
AD7820KP-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Flash
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-PLCC (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7820KP-REEL FAQ
1.How can I place an order for AD7820KP-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7820KP-REEL 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 AD7820KP-REEL reliable?
The price and inventory of AD7820KP-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7820KP-REEL is usually 5 days.
3.What payment methods are accepted for AD7820KP-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7820KP-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7820KP-REEL?
AD7820KP-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7820KP-REEL 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 AD7820KP-REEL?
For technical support, including AD7820KP-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7820KP-REEL requirements.
6.How does Aetrix verify that AD7820KP-REEL is sourced from the original manufacturer or authorized distributors?
All AD7820KP-REEL 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 AD7820KP-REEL meets industry standards.
7.What is the process for return or replacement of AD7820KP-REEL?
All AD7820KP-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7820KP-REEL, 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 AD7820KP-REEL part is unused and in its original packaging.
Return procedure for AD7820KP-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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