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Analog Devices Inc. AD678KNZ
- Part No.:
- AD678KNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD678KNZ.pdf
- Description:
- IC ADC 12BIT FLASH 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,451
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Product details
Overview
AD678KNZ from Analog Devices is a complete 12-bit monolithic sampling analog-to-digital converter (ADC) integrating sample-hold amplifier, voltage reference, clock generation, and microprocessor-compatible bus interface. It delivers 200 kSPS throughput, 1 MHz full-power bandwidth, 72 dB S/N+D (K-grade), ±1 LSB INL, and 10 MΩ input impedance - enabling direct connection to unbuffered sensors in precision data acquisition systems.
For engineers reviewing the AD678KNZ datasheet, AD678KNZ pinout, AD678KNZ application, or AD678KNZ equivalent, this page provides verified technical context, validated pin functions, confirmed AC/DC specifications across temperature grades, real-world timing constraints (e.g., 3.0–4.4 µs conversion time), and two rigorously cross-checked alternative ADCs for signal chain design continuity.
Technical Context
The AD678KNZ implements a recursive subranging architecture with integrated 4-bit flash ADC and 12-bit DAC for error correction, achieving 12-bit resolution at 200 kSPS without external calibration. Its BiMOS process combines CMOS logic and bipolar analog circuits, with laser-trimmed thin-film resistors ensuring DC accuracy.
It supports dual digital interface modes: 12-bit parallel output (via DB11–DB0) or 8-bit multiplexed output (DB11–DB4 with R/L and HBE control), selectable via the 12/8 pin. Input range is configurable as 0–10 V (unipolar, straight binary) or ±5 V (bipolar, twos complement) using BIPOFF and REFIN/REFOUT connections.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - defines smallest detectable input change (2.44 mV at 10 V FS) |
| Sampling Rate | 200 kSPS - enables real-time capture of signals up to 100 kHz Nyquist frequency |
| S/N+D Ratio | 72 dB (K-grade) - ensures ≥11.6 effective bits for dynamic signal fidelity |
| Full-Power Bandwidth | 1 MHz - supports accurate digitization of fast transients without amplitude loss |
| Integral Nonlinearity | ±1 LSB (K-grade) - guarantees monotonicity and no missing codes over full range |
| Input Impedance | 10 MΩ - eliminates need for external buffer when interfacing high-Z sources |
| Reference Output | 5.00 V ±20 mV - stable on-chip reference reduces BOM count and layout complexity |
Pinout & Package
AD678KNZ is housed in a 28-lead plastic DIP (N-28 package) with 0°C to +70°C operating range (K-grade). Pin functions are validated per Analog Devices AD678 Rev. C datasheet and MIL-STD-883-compliant screening.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN | Analog Input | High-impedance (10 MΩ) node accepting 0–10 V or ±5 V signals directly |
| BIPOFF | Bipolar Offset Control | Configures coding mode: tied to AGND for unipolar (straight binary), to REFOUT via 50 Ω for bipolar (twos complement) |
| CS | Chip Select | Active-low enable for synchronous operation; gates SC, OE, and EOC in SYNC = HIGH mode |
| SC | Start Convert | Active-low trigger initiating conversion; requires tSC setup before falling edge |
| OE | Output Enable | Falling edge latches 12-bit data onto DB11–DB0 (12-bit mode) or enables byte reads (8-bit mode) |
| EOC | End-of-Convert | Open-drain (asynchronous) or three-state (synchronous) status flag signaling conversion completion |
| DB11–DB0 | Data Bus Outputs | Three-state outputs delivering 12-bit result; DB1 (R/L) and DB0 (HBE) become inputs in 8-bit mode |
| VCC/VEE/VDD | Power Supplies | +12 V (analog), –12 V (analog), +5 V (digital) - decoupling critical for noise-sensitive performance |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 5 V reference | Eliminates external reference IC and associated trimming, reducing layout area and calibration effort |
| Factory laser-trimmed INL/DNL | Ensures ±1 LSB INL and monotonicity without user calibration or external trim components |
| 10 MΩ input impedance | Permits direct connection to multiplexers, RTDs, or piezoelectric sensors without signal degradation |
| 12-bit or 8-bit bus interface | Supports legacy 8-bit microcontrollers and modern 16-bit processors without glue logic |
| MIL-STD-883 screening option | Enables use in defense/aerospace applications requiring Class B reliability and environmental testing |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensor outputs in PLC I/O modules. IC Role / Device Role / Timing Role: ADC front-end capturing 200 kSPS sampled waveforms with <1 µs input settling for multi-channel scan cycles. Use Value: 10 MΩ input impedance avoids loading high-Z sensor bridges; ±1 LSB INL ensures traceable calibration across 0–70°C industrial range. |
Use Scenario: Digitizing analog signals in benchtop oscilloscopes and spectrum analyzers with >500 kHz linear bandwidth. IC Role / Device Role / Timing Role: High-fidelity sampling engine providing 72 dB S/N+D at 200 kSPS for FFT-based spectral analysis. Use Value: 1 MHz full-power bandwidth preserves amplitude integrity of fast-rising pulses; on-board clock simplifies system synchronization. |
| Medical Instrumentation | Avionics Data Acquisition |
Use Scenario: ECG and EEG signal conditioning in portable diagnostic devices requiring low power and high linearity. IC Role / Device Role / Timing Role: Precision ADC converting biopotential signals with factory-trimmed offset/gain for clinical-grade accuracy. Use Value: Bipolar ±5 V input range matches differential bio-signal amplifiers; twos complement output simplifies DSP arithmetic. |
Use Scenario: Flight control sensor data logging in UAVs and regional aircraft with extended temperature tolerance. IC Role / Device Role / Timing Role: Ruggedized ADC supporting –40°C to +85°C operation (B-grade variants) and MIL-STD-883 screening. Use Value: 560 mW typical power dissipation enables convection-cooled designs; 150 ps aperture jitter minimizes phase noise in servo loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7892BRZ | 12-bit, 1 MSPS SAR ADC; no internal reference or SHA; requires external clock and reference | Higher speed but lacks integrated sample-hold and reference - demands more support circuitry | Select when >200 kSPS is required and board space allows external components |
| ADS8320U | 16-bit, 100 kSPS SAR ADC; 5 V supply only; no bipolar input support | Higher resolution but lower speed and unipolar-only input - unsuitable for ±5 V signal chains | Select when DC precision dominates over speed and bipolar range is not needed |
Compared with AD7892BRZ and ADS8320U, the AD678KNZ uniquely integrates sample-hold, reference, clock, and dual-mode interface in one 28-pin DIP - reducing component count and layout risk for 200 kSPS, ±5 V/0–10 V applications where system-level integration outweighs raw speed or resolution trade-offs.
Availability
AD678KNZ is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, medical instrumentation, avionics data acquisition, and precision sensor interface applications requiring stable component supply across extended lifecycle commitments.
Supply support for AD678KNZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD678KNZ belongs to Analog Devices' legacy high-accuracy sampling ADC product line, designed specifically for applications demanding integrated signal conditioning, factory-trimmed DC accuracy, and robust AC performance in harsh environments.
FAQ
What is the maximum sampling rate supported by the AD678KNZ?
The AD678KNZ supports a maximum sampling rate of 200 kSPS, with a minimum conversion time of 3.0 µs and a required conversion interval (tCR) of 5 µs to maintain specified accuracy. Exceeding this rate degrades INL and S/N+D performance, as confirmed in the AD678 Rev. C timing specifications table. The AD678KNZ achieves this rate using its internal recursive subranging architecture without external clocking overhead.
Does the AD678KNZ require external calibration components?
No - the AD678KNZ is factory laser-trimmed for offset, gain, and linearity, eliminating the need for external trim pots in most applications. Only two 50 Ω ±1% resistors are required for bipolar mode configuration (BIPOFF to REFOUT), and none are needed for unipolar operation beyond the standard REFIN–REFOUT tie. This is explicitly stated in the "Ease of Use" product highlight and verified in the Input Connections section of the datasheet.
What are the valid input voltage ranges for the AD678KNZ?
The AD678KNZ supports two input ranges: 0 V to +10 V (unipolar mode, straight binary coding) and –5 V to +5 V (bipolar mode, twos complement coding). Range selection is controlled by the BIPOFF pin connection - tied to AGND for unipolar, or to REFOUT via 50 Ω for bipolar - as defined in the Pin Description and Input Connections sections of the AD678 Rev. C datasheet.
Can the AD678KNZ interface directly with an 8-bit microcontroller bus?
Yes - the AD678KNZ supports 8-bit multiplexed output mode via the 12/8 pin (tied LOW), using DB11–DB4 for data transfer with R/L (right/left justify) and HBE (high-byte enable) pins controlling byte sequencing. This is fully documented in the OUTPUT ENABLE TRUTH TABLES and Figure 10 timing diagram, enabling seamless integration with 8-bit processors without address/data demultiplexing logic.
What power supplies does the AD678KNZ require?
The AD678KNZ requires three independent supplies: +12 V (VCC), –12 V (VEE), and +5 V (VDD), with specified tolerances of ±5% (VCC/VEE) and ±10% (VDD). Power consumption is 560 mW typical, with ICC = 18 mA, IEE = 25 mA, and IDD = 8 mA. Decoupling with 10 µF tantalum + 0.1 µF ceramic capacitors per supply pin is mandatory per the Application Information section.
AD678KNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- 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:
- Internal
- Voltage - Supply, Analog:
- ±12V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD678KNZ FAQ
1.How can I place an order for AD678KNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD678KNZ 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 AD678KNZ reliable?
The price and inventory of AD678KNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD678KNZ is usually 5 days.
3.What payment methods are accepted for AD678KNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD678KNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD678KNZ?
AD678KNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD678KNZ 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 AD678KNZ?
For technical support, including AD678KNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD678KNZ requirements.
6.How does Aetrix verify that AD678KNZ is sourced from the original manufacturer or authorized distributors?
All AD678KNZ 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 AD678KNZ meets industry standards.
7.What is the process for return or replacement of AD678KNZ?
All AD678KNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD678KNZ, 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 AD678KNZ part is unused and in its original packaging.
Return procedure for AD678KNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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