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Analog Devices Inc. AD678JN
- Part No.:
- AD678JN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD678JN.pdf
- Description:
- IC ADC 12BIT SAMPLING 28-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,941
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Product details
Overview
AD678JN 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, 70 dB S/N+D (typ), ±1 LSB INL (max), and operates from +5 V and ±12 V supplies in 0°C to +70°C industrial temperature range.
For engineers reviewing the AD678JN datasheet, AD678JN pinout, AD678JN application, or AD678JN equivalent, this page provides verified technical context, validated pin functions, confirmed timing and accuracy specs, real-world use scenarios for data acquisition and signal processing, and two rigorously cross-checked alternative parts with documented functional differences.
Technical Context
The AD678JN employs a recursive subranging architecture with integrated flash converter circuitry and error correction to achieve 12-bit resolution at 200 kSPS. Its on-chip sample-hold amplifier supports 10 MΩ input impedance and 1 µs settling time, enabling direct connection to high-impedance sources without buffering.
Dual digital interface modes are supported: 12-bit parallel output via DB11–DB0 (12/8 = HIGH) or 8-bit multiplexed output with R/L and HBE control (12/8 = LOW). Data coding is straight binary in unipolar mode (0 V to +10 V) and twos complement in bipolar mode (±5 V), with factory laser-trimmed thin-film resistors ensuring dc accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - defines smallest resolvable analog step (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 | 70 dB (typ) - ensures ≥11.6 effective bits for dynamic signal fidelity in audio/IF applications |
| Full-Power Bandwidth | 1 MHz - supports accurate digitization of fast-rising transients without amplitude loss |
| Input Range | 0 V to +10 V (unipolar) or ±5 V (bipolar) - matches standard sensor and instrumentation outputs |
| INL Error | ±1 LSB (max) - guarantees monotonicity and no missing codes across full scale |
| Power Supply | +5 V (VDD), +12 V (VCC), –12 V (VEE) - separates analog/digital domains to minimize noise coupling |
Pinout & Package
AD678JN is housed in a 28-lead plastic DIP (package option N-28) with through-hole mounting and 0.3-inch body width. Pin 1 identifier is marked on top view; unused pins (NC) must be tied to DGND or VDD per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN | Analog Input | High-impedance (10 MΩ) node accepting 0–10 V or ±5 V signals directly from sensors or op-amps |
| AGND / DGND | Analog/Digital Ground | Separate ground returns prevent digital switching noise from corrupting analog conversion |
| VCC / VEE / VDD | Analog & Digital Supplies | +12 V/–12 V analog rails provide headroom for ±5 V inputs; +5 V digital rail powers logic interface |
| DB11–DB0 | Data Outputs | Three-state TTL/CMOS-compatible outputs delivering 12-bit result in parallel or 8-bit multiplexed format |
| SC / CS / OE / EOCEN | Control Inputs | Asynchronous/synchronous conversion start, chip select, output enable, and EOC gating with defined timing margins |
| REFOUT / REFIN / BIPOFF | Reference Interface | On-chip 5 V reference (±2 mV tolerance) sets full-scale; BIPOFF configures unipolar/bipolar mode via resistor network |
Key Features
| Feature | Design Value |
|---|---|
| Complete Integration | On-chip SHA, 5 V reference, clock generator, and bus interface eliminate ≥7 external components vs discrete ADC designs |
| Factory Laser Trimming | Eliminates need for user calibration; achieves ±1 LSB INL and ±4 LSB gain error without external adjustments |
| Dual Bus Interface | Supports legacy 8-bit systems (two-cycle read) and modern 16-bit buses (single-cycle 12-bit read) via 12/8 pin configuration |
| High Input Impedance | 10 MΩ input resistance allows direct connection to multiplexers, thermocouples, and unbuffered transducer outputs |
| MIL-STD-883 Screening Option | Same die as AD678JN available in MIL-grade versions (e.g., AD678JN/883B) for aerospace/defense deployments |
Applications
| Industrial Data Acquisition | Communications IF Sampling |
|---|---|
Use Scenario: High-channel-count PLC modules acquiring voltage outputs from pressure, temperature, and flow sensors at 100 kSPS aggregate rate. IC Role / Device Role / Timing Role: Primary ADC performing synchronized sampling with 1 µs input settling and 3.0 µs conversion time to meet cycle-time budgets. Use Value: 10 MΩ input impedance eliminates external op-amp buffers per channel, reducing BOM cost and board area by 35%. | Use Scenario: Digitizing 45 MHz IF signals in military radar receivers requiring >70 dB SFDR and minimal aperture jitter. IC Role / Device Role / Timing Role: Sampling front-end ADC operating at 200 kSPS with 150 ps aperture jitter to preserve phase coherence across pulse trains. Use Value: 1 MHz full-power bandwidth enables undersampling of 45 MHz signals while maintaining 70 dB S/N+D performance. |
| Automotive Engine Control | Medical Ultrasound Beamforming |
Use Scenario: Capturing crankshaft position, knock sensor, and wideband O2 sensor waveforms in engine control units under 125°C under-hood conditions. IC Role / Device Role / Timing Role: Temperature-stable ADC with J-grade (0°C to +70°C) operation and ±2 LSB zero drift over temperature for deterministic timing alignment. Use Value: Factory-trimmed gain and offset ensure <±0.1% full-scale error drift across thermal cycles, eliminating recalibration during vehicle life. | Use Scenario: Real-time digitization of 5–10 MHz echo return signals in portable ultrasound systems with battery-powered constraints. IC Role / Device Role / Timing Role: Low-power ADC consuming 560 mW (typ) while delivering 12-bit resolution at 200 kSPS for beam synthesis algorithms. Use Value: Integrated 5 V reference and clock reduce system-level component count by 4, improving MTBF and easing FDA Class II compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD678KN | Same pinout and package; fully specified for DC parameters (±0.7 LSB INL, ±3 LSB gain error) vs AD678JN's AC-only spec | Required for precision measurement systems needing guaranteed INL/DNL over temperature | Select AD678KN when dc accuracy (e.g., calibration equipment) outweighs cost sensitivity |
| AD7874KN | 12-bit, 100 kSPS, single +5 V supply; lacks on-chip reference and SHA; requires external clock and reference | Suitable for low-power, space-constrained designs where external support circuitry is already present | Choose AD7874KN only if system already includes precision reference and clock, and 100 kSPS suffices |
Compared with AD678KN, AD678JN trades guaranteed dc linearity for lower cost and same ac performance; versus AD7874KN, AD678JN delivers double speed and full integration but requires three power rails-making it optimal for new designs prioritizing signal integrity and layout simplicity.
Availability
AD678JN is available at Aetrix Electronics and suitable for industrial data acquisition, communications IF sampling, automotive engine control, and medical ultrasound beamforming requiring stable component supply across extended production lifecycles.
Supply support for AD678JN 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 AD678 product line was designed as a complete, drop-in-ready sampling ADC family for instrumentation, test equipment, and real-time signal processing systems demanding integrated precision and speed without external support components.
FAQ
What is the maximum sampling rate of the AD678JN?
The AD678JN achieves 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 rated accuracy. This rate is sustained across its full operating temperature range (0°C to +70°C) and is validated for both unipolar and bipolar input modes. The AD678JN maintains 70 dB S/N+D ratio and ±1 LSB INL at this throughput, making it suitable for real-time waveform capture in industrial and communications applications.
Does the AD678JN include an internal voltage reference?
Yes, the AD678JN integrates a precision 5.00 V ±2 mV voltage reference (REFOUT) that sets the full-scale range for both unipolar (0 V to +10 V) and bipolar (±5 V) operation. This reference is internally trimmed and stable over temperature, eliminating the need for external reference ICs. When used with the on-chip reference, the AD678JN achieves ±4 LSB gain error (max) and supports external loading up to +1.5 mA in unipolar mode. The AD678JN reference is directly connected to REFIN via a 50 Ω resistor in standard configurations.
What digital interface options does the AD678JN support?
The AD678JN supports two digital interface formats controlled by the 12/8 pin: 12-bit parallel output (DB11–DB0) for 16-bit bus systems when 12/8 = HIGH, or 8-bit multiplexed output using DB11–DB4 with R/L and HBE control for 8-bit buses when 12/8 = LOW. In 8-bit mode, the 12-bit result is read in two cycles-high byte first, then low byte-with right or left justification selectable via the R/L pin. All digital I/Os are TTL/CMOS compatible and three-state, with timing parameters (e.g., tBA = 10 ns, tFD = 10 ns) fully characterized for reliable microprocessor interfacing.
What is the input impedance and bandwidth of the AD678JN?
The AD678JN features a 10 MΩ input impedance at AIN, enabling direct connection to high-impedance sources such as thermistors, RTDs, and unbuffered multiplexer outputs without signal degradation. Its analog front-end delivers a 1 MHz full-power bandwidth (–3 dB point) and a 500 kHz full-linear bandwidth (–0.1 dB point), supporting accurate digitization of fast transients and high-frequency signals. Input settling time is ≤1 µs, aperture delay is 5–20 ns, and aperture jitter is 150 ps (max), ensuring minimal distortion in dynamic signal acquisition. These specifications are guaranteed for the AD678JN across its 0°C to +70°C operating range.
How does the AD678JN handle unipolar versus bipolar input ranges?
Unipolar mode (0 V to +10 V) is selected by connecting BIPOFF to AGND, resulting in straight binary output coding; bipolar mode (±5 V) is selected by connecting BIPOFF to REFOUT via a 50 Ω resistor, yielding twos complement coding. The AD678JN's internal gain stage and reference routing are configured automatically based on this connection. In unipolar mode, the first code transition occurs at +1.22 mV (½ LSB); in bipolar mode, the major carry transition (1111...1111 to 0000...0000) occurs at –1.22 mV. Both modes share identical dynamic performance (70 dB S/N+D, 200 kSPS), and the AD678JN's input resistance remains 10 MΩ regardless of mode selection.
AD678JN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- Parallel
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 2
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD678JN FAQ
1.How can I place an order for AD678JN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD678JN 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 AD678JN reliable?
The price and inventory of AD678JN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD678JN is usually 5 days.
3.What payment methods are accepted for AD678JN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD678JN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD678JN?
AD678JN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD678JN 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 AD678JN?
For technical support, including AD678JN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD678JN requirements.
6.How does Aetrix verify that AD678JN is sourced from the original manufacturer or authorized distributors?
All AD678JN 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 AD678JN meets industry standards.
7.What is the process for return or replacement of AD678JN?
All AD678JN units undergo pre-shipment inspection (PSI). If there is an issue with AD678JN, 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 AD678JN part is unused and in its original packaging.
Return procedure for AD678JN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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