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Analog Devices Inc. AD7678ASTZRL
- Part No.:
- AD7678ASTZRL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-LQFP
- Datasheet:
-
AD7678ASTZRL.pdf
- Description:
- IC ADC 18BIT SAR 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,031
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Product details
Overview
AD7678ASTZRL from Analog Devices is an 18-bit, 100 kSPS charge redistribution SAR analog-to-digital converter with ±2.5 LSB INL, differential ±VREF input (up to 5 V), and dual serial/parallel interface. It operates on a single 5 V supply, delivers 103 dB dynamic range at 5 V reference, and targets high-accuracy data acquisition in medical CT scanners and geophone sensor systems.
For engineers reviewing the AD7678ASTZRL datasheet, AD7678ASTZRL pinout, AD7678ASTZRL application, or AD7678ASTZRL equivalent, this page provides verified specifications, functional pin mapping, real-world use cases, and validated alternative options for precision ADC selection in industrial and medical instrumentation.
Technical Context
The AD7678ASTZRL implements a fully differential, no-pipeline-delay SAR architecture with integrated conversion clock, on-chip error correction, and configurable interface modes (18-/16-/8-bit parallel or SPI/QSPI/MICROWIRE-compatible serial). Its internal reference buffer accepts 2.5 V input to generate a stable 4.096 V reference output.
It supports three power-down states via PD and PDBUF pins, achieves 5 ps rms aperture jitter, and maintains ±0.5 ppm/°C zero-error drift across –40°C to +85°C. Conversion timing is deterministic: 1.5 µs conversion time, 8.5 µs acquisition time, and BUSY-driven data-ready signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with no missing codes - guarantees monotonicity and full code coverage for precision measurement. |
| Throughput Rate | 100 kSPS - enables real-time capture of fast transients in spectrum analysis and medical imaging. |
| INL | ±2.5 LSB max (±9.5 ppm FS) - ensures linearity critical for calibration-critical instrumentation. |
| Differential Input Range | ±VREF (up to ±5 V) - supports true bipolar signal conditioning without external level-shifting. |
| Dynamic Range | 103 dB typ @ VREF = 5 V - delivers >16.8 ENOB for low-noise sensor front-ends. |
| Power Dissipation | 18 mW @ 100 kSPS / 180 µW @ 1 kSPS - enables scalable power management in battery-aware or thermally constrained systems. |
| Interface Flexibility | Parallel (18/16/8-bit) + serial (SPI/QSPI/MICROWIRE) - simplifies integration with both legacy microcontrollers and modern FPGA-based controllers. |
Pinout & Package
AD7678ASTZRL is packaged in a 48-lead LQFP (ASTZ suffix) with exposed pad internally connected to AGND. Pin compatibility is confirmed with AD7674/AD7676/AD7679 for drop-in upgrades.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+, IN– | Differential analog inputs | Accept true differential signals up to ±5 V; CMRR ≥65 dB at 100 kHz enables noise rejection in EMI-prone environments. |
| REF, REFGND | Reference voltage terminals | Support external reference or internal buffered 4.096 V output; REFGND must be star-connected to AGND for optimal PSRR. |
| CNVST | Conversion start trigger | Falling-edge initiated sampling; aperture delay = 2 ns ensures precise timing alignment in synchronized multi-ADC systems. |
| BUSY | Conversion status indicator | Active-HIGH during conversion; falling edge serves as hardware data-ready signal for DMA or interrupt-driven reads. |
| MODE0, MODE1 | Interface configuration inputs | Select among 18-bit parallel, 16-bit parallel, byte-mode, or serial interface - enables one hardware design to support multiple host architectures. |
| PDBUF | Reference buffer enable | LOW enables internal 4.096 V reference buffer; HIGH disables it for external reference use - eliminates need for external op-amp buffering. |
| PD | Power-down control | HIGH places device in low-power state after current conversion completes; reduces current to <1 µA for standby operation. |
| SDOUT, SCLK, SYNC | Serial interface outputs | Provide MSB-first SPI-compatible output; EXT/INT and INVSCLK pins allow clock polarity/frame sync customization for FPGA or DSP interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay (SAR architecture) | Zero-latency conversion enables real-time closed-loop control and deterministic timing in feedback systems. |
| On-board reference buffer | Generates stable 4.096 V output from 2.5 V REFBUFIN input - removes external buffer IC and associated layout sensitivity. |
| Dual interface support | Single device supports 18-bit parallel bus for microcontroller hosts and 2-wire serial for space-constrained FPGA designs. |
| Low power scaling | Consumes only 180 µW at 1 kSPS - suitable for intermittent-sampling applications like portable diagnostics or environmental monitoring. |
| High CMRR & low THD | 65 dB CMRR at 100 kHz and –118 dB THD at 2 kHz minimize distortion in high-fidelity signal chains such as hydrophone arrays. |
Applications
| CT Scanners | Geophone Sensor Arrays |
|---|---|
Use Scenario: Digitizing X-ray detector signals with sub-millimeter spatial resolution and high dynamic range. IC Role / Device Role / Timing Role: Primary SAR ADC capturing 100 kSPS differential detector outputs with <2.5 LSB INL to preserve contrast fidelity. Use Value: 103 dB dynamic range resolves low-contrast tissue boundaries; single-supply 5 V operation simplifies detector module power architecture. |
Use Scenario: High-channel-count seismic data acquisition where low noise and channel matching are essential. IC Role / Device Role / Timing Role: Precision front-end ADC for low-frequency (<1 kHz) vibration sensing with differential input rejecting common-mode ground noise. Use Value: ±2.5 LSB INL and 5 ps aperture jitter ensure consistent channel gain/phase response across 64+ channels in distributed arrays. |
| Medical Instrumentation | Spectrum Analysis Equipment |
Use Scenario: Portable ultrasound or EEG systems requiring low-power, high-resolution digitization of bio-signals. IC Role / Device Role / Timing Role: Low-noise ADC converting amplified analog bio-potentials with minimal added distortion or quantization error. Use Value: 100 dB S/(N+D) at 2 kHz and 180 µW standby power extend battery life while preserving diagnostic SNR. |
Use Scenario: Real-time RF spectrum monitoring up to 45 kHz baseband bandwidth with spurious-free performance. IC Role / Device Role / Timing Role: High-linearity ADC feeding FFT engines in handheld analyzers, requiring SFDR >110 dB to detect weak signals near strong interferers. Use Value: 120 dB SFDR at 2 kHz and –115 dB THD at 10 kHz suppress harmonic artifacts that mask adjacent-channel signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7679ASTZ | Same 18-bit/100 kSPS SAR core but in 48-lead LFCSP package; lower θJA (26°C/W) enables higher ambient temperature operation. | Better thermal performance suits compact enclosures or stacked PCBs where LQFP self-heating limits reliability. | Select AD7679ASTZ when board space or thermal dissipation constraints favor LFCSP over LQFP. |
| AD7674ASTZ | Pin-compatible predecessor with identical pinout and interface logic; INL ±3 LSB (vs. ±2.5 LSB) and 99 dB dynamic range. | Lower cost option acceptable where 0.5 LSB linearity margin and 4 dB dynamic range reduction are tolerable. | Choose AD7674ASTZ for legacy redesigns requiring minimal validation effort and relaxed accuracy requirements. |
Compared with AD7678ASTZRL, AD7679ASTZ offers superior thermal efficiency in space-constrained layouts, while AD7674ASTZ provides a validated, lower-cost drop-in replacement where ±3 LSB INL meets system-level linearity budgets.
Availability
AD7678ASTZRL is available at Aetrix Electronics and suitable for CT scanner subsystems, geophone data loggers, portable medical instruments, and spectrum analysis equipment requiring stable component supply and long-term production continuity.
Supply support for AD7678ASTZRL 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, headquartered in Norwood, MA, with R&D and manufacturing infrastructure spanning North America, Europe, and Asia.
The AD7678ASTZRL belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for applications demanding high resolution, low latency, and excellent DC/AC accuracy without pipeline delay - notably medical imaging, test equipment, and seismic instrumentation.
FAQ
What is the maximum recommended reference voltage for AD7678ASTZRL?
The AD7678ASTZRL supports an external reference voltage up to AVDD + 0.1 V, with AVDD nominally at 5 V. When using the internal reference buffer, apply 2.5 V to REFBUFIN to generate a tightly regulated 4.096 V output on the REF pin. Exceeding 5.1 V on REF risks violating absolute maximum ratings and may degrade INL performance in the AD7678ASTZRL.
Does AD7678ASTZRL support true differential input operation?
Yes, AD7678ASTZRL is a fully differential SAR ADC: its IN+ and IN– inputs accept true differential signals across ±VREF (up to ±5 V), with 65 dB CMRR at 100 kHz. This architecture rejects common-mode noise and eliminates the need for external instrumentation amplifiers in balanced sensor interfaces - a key capability confirmed in the AD7678ASTZRL functional block diagram and specifications table.
How does the PDBUF pin affect reference operation in AD7678ASTZRL?
In AD7678ASTZRL, the PDBUF pin controls the internal reference buffer: when driven LOW, the buffer is enabled and outputs 4.096 V (typ) from a 2.5 V REFBUFIN input; when HIGH, the buffer is disabled and REF becomes a high-impedance input for external reference connection. This dual-mode flexibility allows AD7678ASTZRL to operate with either internal buffered or external precision references without hardware change.
Can AD7678ASTZRL interface directly with a 3 V microcontroller?
Yes, AD7678ASTZRL supports mixed-voltage operation: OVDD can be set to 2.7 V–5.25 V independently of DVDD (5 V), enabling direct connection to 3 V logic families. The serial interface (SDOUT, SCLK, SYNC) and parallel data pins (D0–D17) are OVDD-referenced, and VIH/VIL thresholds scale accordingly - verified in the AD7678ASTZRL timing and digital interface sections.
What is the purpose of the MODE0 and MODE1 pins on AD7678ASTZRL?
The MODE0 and MODE1 pins configure the AD7678ASTZRL's digital interface mode: 00 selects 18-bit parallel, 01 selects 16-bit parallel, 10 selects byte-mode (8-bit), and 11 selects serial interface. This programmability allows a single AD7678ASTZRL footprint to serve diverse host processors - from legacy 16-bit microcontrollers to modern FPGAs using SPI - without redesigning the PCB layout.
AD7678ASTZRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 48-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI, Parallel, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-LQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7678ASTZRL FAQ
1.How can I place an order for AD7678ASTZRL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7678ASTZRL 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 AD7678ASTZRL reliable?
The price and inventory of AD7678ASTZRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7678ASTZRL is usually 5 days.
3.What payment methods are accepted for AD7678ASTZRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7678ASTZRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7678ASTZRL?
AD7678ASTZRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7678ASTZRL 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 AD7678ASTZRL?
For technical support, including AD7678ASTZRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7678ASTZRL requirements.
6.How does Aetrix verify that AD7678ASTZRL is sourced from the original manufacturer or authorized distributors?
All AD7678ASTZRL 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 AD7678ASTZRL meets industry standards.
7.What is the process for return or replacement of AD7678ASTZRL?
All AD7678ASTZRL units undergo pre-shipment inspection (PSI). If there is an issue with AD7678ASTZRL, 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 AD7678ASTZRL part is unused and in its original packaging.
Return procedure for AD7678ASTZRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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