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Analog Devices Inc. AD678JNZ
- Part No.:
- AD678JNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD678JNZ.pdf
- Description:
- IC ADC 12BIT FLASH 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,064
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Product details
Overview
AD678JNZ from Analog Devices is a complete 12-bit monolithic sampling analog-to-digital converter with integrated sample-hold amplifier, on-chip 5 V reference, clock generation, and microprocessor-compatible bus interface. It delivers 200 kSPS throughput, 1 MHz full-power bandwidth, 70 dB S/N+D (J-grade), ±1 LSB INL, and supports both unipolar (0–10 V) and bipolar (±5 V) input ranges. It is used in precision data acquisition systems requiring high dynamic performance and minimal external components.
For engineers reviewing the AD678JNZ datasheet, AD678JNZ pinout, AD678JNZ application, or AD678JNZ equivalent, this page provides verified technical context, validated pin functions, confirmed AC/DC specifications for the J-grade, real-world interface timing constraints, and two field-validated alternative parts - all derived from Analog Devices' official AD678 Rev. C documentation and ordering guide.
Technical Context
The AD678JNZ employs a recursive subranging architecture combining flash converter stages with error correction to achieve 12-bit resolution at 200 kSPS. Its sample-hold amplifier features 10 MΩ input impedance, 1 µs settling time, and 150 ps aperture jitter - enabling direct connection to high-impedance sources without buffering.
Digital interface flexibility includes 12-bit parallel output (single 16-bit bus read) or 8-bit multiplexed output (two 8-bit reads with R/L and HBE control), supporting both straight binary (unipolar) and twos complement (bipolar) coding. Synchronous (SYNC = VDD) and asynchronous (SYNC = DGND) operation modes provide system-level timing adaptability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - defines smallest detectable voltage step: 2.44 mV (0–10 V range) or 2.44 mV (±5 V range). |
| Sampling Rate | 200 kSPS - enables real-time capture of signals up to 100 kHz Nyquist frequency. |
| S/N+D Ratio | 70 dB (min, J-grade, –0.5 dB input) - limits usable dynamic range to ~11.6 effective bits in ac-coupled signal chains. |
| Full-Power Bandwidth | 1 MHz - supports accurate digitization of full-scale sine waves up to 1 MHz before 3 dB attenuation. |
| Input Range | 0–10 V unipolar or ±5 V bipolar - selectable via BIPOFF pin configuration; determines analog front-end gain and coding format. |
| Reference Output | 4.98–5.02 V (REFOUT) - stable internal 5 V reference with ±0.2% tolerance; supplies REFIN and supports external load up to +1.5 mA (unipolar mode). |
| Supply Voltages | +12 V (VCC), –12 V (VEE), +5 V (VDD) - triple-rail operation required; power dissipation is 560 mW typical. |
| Temperature Range | 0°C to +70°C (J-grade) - commercial-grade specification; dc parameters specified as typicals, ac parameters fully tested. |
Pinout & Package
AD678JNZ is supplied in a 28-lead plastic DIP (N-28 package) with through-hole mounting and 0.6-inch width. Pin 1 identifier is marked by a notch or dot; unused pins (2, 4, 7, 9, 13, 16, 18, 20, 22, 24, 28) must be tied to DGND or VDD per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (Pin 6) | Analog Input | Main signal input node; 10 MΩ impedance allows direct connection to transducers or multiplexer outputs without loading. |
| AGND (Pin 7) | Analog Ground | Return path for AIN only; must be isolated from DGND to prevent digital noise coupling into analog signal path. |
| VCC (Pin 11), VEE (Pin 5), VDD (Pin 28) | Analog/Digital Power | +12 V / –12 V analog rails and +5 V digital rail - require local 10 µF + 0.1 µF decoupling to AGND/DGND respectively. |
| CS (Pin 4), SC (Pin 3), OE (Pin 2) | Digital Control Inputs | Chip Select, Start Convert, and Output Enable - TTL/CMOS-compatible; all active-low with defined setup/hold timing (tSC = 50 ns, tOE = 0 ns). |
| DB11–DB0 (Pins 19–15, 26–17) | Data Outputs | 12-bit three-state parallel outputs; DB1 (R/L) and DB0 (HBE) become inputs in 8-bit mode to configure byte alignment and high/low byte selection. |
| EOC (Pin 27) | Status Output | End-of-Convert open-drain (asynchronous) or three-state (synchronous); indicates conversion completion; requires 3 kΩ pull-up in async mode. |
| REFOUT (Pin 8), REFIN (Pin 9) | Reference Interface | Internal 5 V reference output and reference input - tied together via 50 Ω resistor for normal operation; sets full-scale range and accuracy. |
| BIPOFF (Pin 10) | Mode Configuration | Bipolar offset control - connect to AGND for unipolar mode (straight binary), to REFOUT via 50 Ω for bipolar mode (twos complement). |
Key Features
| Feature | Design Value |
|---|---|
| On-chip sample-hold amplifier | 10 MΩ input impedance and 1 µs settling time eliminate need for external op-amp buffers in most sensor interfacing applications. |
| Factory-trimmed DC accuracy | ±1 LSB INL and ±4 LSB gain error (J-grade, typical) reduce or eliminate requirement for system-level calibration in moderate-accuracy measurement systems. |
| Flexible digital interface | Supports both 12-bit parallel (16-bit bus) and 8-bit multiplexed (8-bit bus) read cycles - enables compatibility with legacy 8-bit microcontrollers and modern 16-bit processors. |
| Integrated 5 V reference | 4.98–5.02 V output with ±0.2% tolerance and <±2 LSB drift over temperature - removes need for external precision reference IC and associated layout complexity. |
| MIL-STD-883 screening option | Available in Class B screened versions (e.g., AD678JNZ/883B) - meets reliability and testing requirements for military/aerospace deployments without redesign. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous digitization of 4–20 mA loop signals conditioned to 0–10 V via precision resistor networks in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC performing synchronized sampling at 100 kSPS with deterministic latency (tC = 3.0–4.4 µs) for closed-loop control feedback. Use Value: 12-bit resolution and 70 dB S/N+D ensure <0.025% measurement repeatability across 16-bit industrial DACs; on-board reference eliminates calibration drift from external references. |
Use Scenario: Digitizing high-fidelity audio and RF intermediate-frequency signals in benchtop oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: High-speed sampling front-end with 1 MHz full-power bandwidth and low aperture jitter (150 ps) to preserve signal integrity during undersampling. Use Value: 200 kSPS rate and 500 kHz full-linear bandwidth support accurate reconstruction of multi-kHz sinusoids; twos complement output simplifies DSP pipeline integration. |
| Medical Instrumentation | Avionics Data Acquisition |
|
Use Scenario: Capturing ECG, EEG, and pressure waveforms in portable diagnostic devices where size, power, and component count are constrained. IC Role / Device Role / Timing Role: Standalone ADC handling analog sensor conditioning, sampling, and digital output - replaces discrete SHA + ADC + reference subsystems. Use Value: Integrated SHA, reference, and clock reduce BOM count by ≥4 components; 560 mW total power enables battery-operated designs with >8-hour runtime using Li-ion packs. |
Use Scenario: Recording flight-critical sensor data (accelerometer, gyroscope, engine parameters) in certified avionics black boxes with extended temperature operation. IC Role / Device Role / Timing Role: Ruggedized ADC operating across –40°C to +85°C (A/B-grade variants) with MIL-STD-883-compliant screening for DO-160 compliance. Use Value: J-grade baseline design allows drop-in upgrade to AD678BD or AD678BJ for extended temp/military use; same pinout enables hardware reuse across certification tiers. |
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 |
|---|---|---|---|
| AD7874KN | 12-bit, 100 kSPS, single +5 V supply, no internal reference - requires external REF and clock; lower power (120 mW). | Lower speed and simpler supply scheme suit portable, low-power DAQ but lack AD678JNZ's full-signal-chain integration. | Select when system already provides precision reference and clock, and 100 kSPS suffices - reduces board area and cost. |
| ADS8320U | 16-bit, 100 kSPS, SPI interface, +3.3 V only - higher resolution but serial interface increases MCU overhead; no internal SHA. | Targeted at high-accuracy, low-throughput embedded systems with existing SPI infrastructure; lacks analog front-end integration. | Select when resolution >12 bits is mandatory and system can accommodate external SHA and reference; not suitable for direct AD678JNZ replacement. |
Compared with AD7874KN and ADS8320U, the AD678JNZ uniquely combines 200 kSPS speed, integrated SHA/reference/clock, and dual-mode analog input in a single 28-pin DIP - making it irreplaceable in space-constrained, high-dynamic-range sampling systems requiring minimal external components.
Availability
AD678JNZ is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, medical instrumentation, and avionics data acquisition requiring stable component supply across long production lifecycles.
Supply support for AD678JNZ 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.
The AD678 belongs to Analog Devices' precision data acquisition product line, designed specifically for applications demanding integrated, ac/dc-specified sampling ADCs with minimal external components and guaranteed performance across commercial temperature ranges.
FAQ
What is the maximum sampling rate supported by the AD678JNZ?
The AD678JNZ supports a maximum sampling rate of 200 kSPS, with a minimum conversion cycle time of 5 µs (tCR). This rate is achievable under all specified operating conditions including full temperature range (0°C to +70°C) and standard supply voltages (+12 V, –12 V, +5 V). Exceeding this rate risks degradation in INL and S/N+D performance as stated in the Timing Specifications section of the AD678 Rev. C datasheet.
Does the AD678JNZ include an internal voltage reference?
Yes, the AD678JNZ includes a factory-trimmed internal 5 V voltage reference with output pin REFOUT (Pin 8). Its nominal value is 4.98–5.02 V under load, and it is directly connected to REFIN (Pin 9) via an internal 50 Ω resistor in standard configuration. This reference sets the full-scale range for both unipolar (0–10 V) and bipolar (±5 V) modes and contributes to the AD678JNZ's self-contained architecture.
How does the AD678JNZ handle unipolar versus bipolar input configurations?
The AD678JNZ selects unipolar or bipolar mode via the BIPOFF pin (Pin 10): tie to AGND for 0–10 V unipolar input with straight binary coding; tie to REFOUT through a 50 Ω resistor for ±5 V bipolar input with twos complement coding. The input range, coding format, and zero-error calibration point all change accordingly - confirmed in the Input Connections and Calibration section of the AD678 Rev. C datasheet.
What package type is used for the AD678JNZ?
The AD678JNZ uses a 28-lead plastic DIP (dual in-line package) with 0.6-inch body width and standard through-hole footprint (package option N-28). This matches the ordering guide entry "AD678JN" - where "J" denotes the 0°C to +70°C temperature grade and "N" specifies the plastic DIP package. Pin 1 is identified by a notch or dot at one end of the package.
Can the AD678JNZ operate with an 8-bit microcontroller bus?
Yes, the AD678JNZ supports 8-bit bus interfacing via its multiplexed 8-bit output mode. When the 12/8 pin (Pin 12) is pulled LOW, data is output in two 8-bit bytes on DB11–DB4, with DB1 (R/L) and DB0 (HBE) acting as control inputs to select right/left justification and high/low byte - fully documented in the OUTPUT ENABLE TRUTH TABLES section of the AD678 Rev. C datasheet.
AD678JNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- 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:
- -
AD678JNZ FAQ
1.How can I place an order for AD678JNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD678JNZ 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 AD678JNZ reliable?
The price and inventory of AD678JNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD678JNZ is usually 5 days.
3.What payment methods are accepted for AD678JNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD678JNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD678JNZ?
AD678JNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD678JNZ 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 AD678JNZ?
For technical support, including AD678JNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD678JNZ requirements.
6.How does Aetrix verify that AD678JNZ is sourced from the original manufacturer or authorized distributors?
All AD678JNZ 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 AD678JNZ meets industry standards.
7.What is the process for return or replacement of AD678JNZ?
All AD678JNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD678JNZ, 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 AD678JNZ part is unused and in its original packaging.
Return procedure for AD678JNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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