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Analog Devices Inc. AD7683ACPZRL7
- Part No.:
- AD7683ACPZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-VDFN Exposed Pad, CSP
- Datasheet:
-
AD7683ACPZRL7.pdf
- Description:
- IC ADC 16BIT SAR 8LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:485
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Product details
Overview
AD7683ACPZRL7 from Analog Devices is a 16-bit, 100 kSPS, pseudo-differential successive approximation ADC with no missing codes (B grade), single-supply operation (2.7 V to 5.5 V), SPI/QSPI/MICROWIRE-compatible serial interface, and 1 nA standby current. It integrates an on-chip track-and-hold and operates in MSOP or 3 mm × 3 mm QFN (LFCSP) packages for precision data acquisition in space-constrained, low-power systems.
For engineers reviewing the AD7683ACPZRL7 datasheet, AD7683ACPZRL7 pinout, AD7683ACPZRL7 application, or AD7683ACPZRL7 equivalent, key selection criteria include its 16-bit resolution with ±1 LSB typical INL, 90 dB SNR at 1 kHz, 4 mW power at 5 V/100 kSPS, and support for external reference voltages up to VDD - critical for battery-powered instrumentation and medical sensors requiring high DC accuracy and low idle power.
Technical Context
The AD7683ACPZRL7 uses a charge redistribution SAR architecture with a built-in track-and-hold, enabling zero-latency conversion and no pipeline delay. Its pseudo-differential input accepts 0 V to VREF across +IN and –IN, referenced to a ground-sense –IN pin, supporting remote ground sensing for noise rejection in noisy analog environments.
Conversion is initiated on the CS falling edge, synchronized to an external DCLOCK (≤2.9 MHz), with full 16-bit output delivered in 22–24 clock cycles. Power scales linearly with throughput - consuming only 150 µW at 10 kSPS/2.7 V - making it suitable for duty-cycled, energy-sensitive measurement nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes (B grade); guarantees monotonicity and full code coverage over temperature. |
| Throughput Rate | 100 kSPS maximum; complete cycle time of 10 µs enables real-time sampling of signals up to ~40 kHz Nyquist bandwidth. |
| INL Accuracy | ±1 LSB typical, ±3 LSB max (B grade); ensures <0.0015% full-scale linearity error for precision DC measurements. |
| Power Dissipation | 4 mW @ 5 V / 100 kSPS; drops to 150 µW @ 2.7 V / 10 kSPS - supports ultra-low-power sleep-wake architectures. |
| Reference Range | 0.5 V to VDD; allows flexible scaling from low-voltage sensor outputs (e.g., 2.5 V REF) to full supply rails without external buffers. |
| Standby Current | 1 nA at 25°C; enables multi-year battery life in intermittent-sampling applications like portable diagnostics. |
| Digital Interface | SPI/QSPI/MICROWIRE/DSP-compatible 3-wire serial (CS, DCLOCK, DOUT); no external framing logic required. |
Pinout & Package
The AD7683ACPZRL7 is available in an 8-lead QFN (LFCSP) package (3 mm × 3 mm), RoHS-compliant, with exposed pad connected to GND for thermal and noise performance. Pin 1 = REF, Pin 2 = +IN, Pin 3 = –IN, Pin 4 = GND, Pin 5 = CS, Pin 6 = DOUT, Pin 7 = DCLOCK, Pin 8 = VDD. Exposed pad is electrically optional but recommended for thermal stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF | Analog reference input | Accepts 0.5 V to VDD; decoupled with ≥2.2 µF ceramic capacitor to GND for stable conversion accuracy. |
| +IN | Pseudo-differential analog input | Measures voltage relative to –IN; supports 0 V to VREF range with 1 nA leakage for high-impedance source compatibility. |
| –IN | Analog ground sense | Enables remote ground referencing to reject common-mode noise; must be tied to analog ground or sensor return. |
| GND | Power and analog ground | Common reference for VDD, REF, and analog inputs; requires low-inductance connection to minimize noise coupling. |
| CS | Digital chip select | Falling edge initiates conversion and enables DOUT; device enters shutdown mode upon completion. |
| DOUT | Serial data output | 16-bit straight-binary output synchronized to DCLOCK falling edge; high-impedance when CS is high. |
| DCLOCK | Serial interface clock | Accepts up to 2.9 MHz; controls timing of data readout; no internal clock generation required. |
| VDD | Single power supply | 2.7 V to 5.5 V operation; powers analog and digital sections; current scales linearly with throughput. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes (16-bit) | Guaranteed monotonic transfer function across full temperature range (−40°C to +85°C), eliminating code ambiguities in closed-loop control. |
| 1 nA standby current | Enables microamp-level system sleep states; ideal for wake-on-event architectures in portable medical and environmental monitors. |
| Pseudo-differential input with –IN sense | Rejects ground potential differences between sensor and ADC; eliminates offset drift caused by PCB trace IR drop or shared return paths. |
| Linear power vs. throughput scaling | Reduces average power by >95% at 10 kSPS vs. 100 kSPS - simplifies thermal design and extends battery runtime without sacrificing resolution. |
| SPI-compatible 3-wire interface | Eliminates need for additional level shifters or protocol translators; directly interfaces with ARM Cortex-M, Blackfin DSPs, and microcontrollers. |
Applications
| Battery-Powered Diagnostic Sensors | Industrial Process Monitoring |
|---|---|
|
Use Scenario: Portable blood glucose meter acquiring analog output from electrochemical test strip sensor at 10–50 SPS with periodic calibration. IC Role / Device Role / Timing Role: ADC front-end converting low-level mV-range sensor voltage into 16-bit digital values; triggered by microcontroller via CS pulse. Use Value: 150 µW power at 10 kSPS and 1 nA standby enable multi-week operation on coin-cell battery; ±1 LSB INL ensures clinical-grade measurement repeatability. |
Use Scenario: Distributed temperature/pressure node in factory automation system logging data every 100 ms using thermocouple or strain gauge bridge. IC Role / Device Role / Timing Role: Precision digitizer for ratiometric or referenced analog signals; synchronized to host controller's SPI bus for deterministic data capture. Use Value: Pseudo-differential input rejects common-mode noise from 24 V DC plant wiring; 90 dB SNR preserves signal integrity despite EMI in industrial enclosures. |
| Portable Medical Instrumentation | High-Accuracy Data Loggers |
|
Use Scenario: Handheld ECG front-end amplifying and digitizing differential lead signals with baseline wander correction and anti-alias filtering. IC Role / Device Role / Timing Role: Final-stage ADC after programmable gain amplifier; samples at 1–5 kSPS with precise timing controlled by microcontroller's DCLOCK. Use Value: Track-and-hold eliminates pipeline latency, enabling real-time waveform reconstruction; 0.5 V minimum REF supports low-noise LDO-referenced designs. |
Use Scenario: Environmental data logger recording soil moisture, light, and humidity over weeks using solar-charged Li-ion battery. IC Role / Device Role / Timing Role: Low-power ADC for multiplexed sensor array; wakes periodically to sample all channels before returning to 1 nA shutdown. Use Value: Linear power scaling and guaranteed no-missing-codes ensure consistent 16-bit fidelity across varying sample rates and battery voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7685BRMZ | Higher throughput (250 kSPS), ±0.5 LSB typical INL, same 8-lead MSOP/QFN footprint, but requires 3.3 V min VDD. | Better suited for higher-bandwidth applications (e.g., vibration analysis) where 100 kSPS is limiting. | Select AD7685BRMZ if system needs >100 kSPS or tighter INL; verify VDD ≥3.3 V and layout compatibility with AD7683ACPZRL7. |
| ADS8325IPW | 16-bit, 100 kSPS, but uses parallel interface and requires dual supplies (±5 V analog, +3.3 V digital); no integrated track-and-hold. | Legacy industrial systems with existing parallel bus infrastructure and higher power budgets. | Choose ADS8325IPW only when migrating from legacy parallel-based designs; avoid for new low-power or SPI-native designs. |
Compared with AD7685BRMZ and ADS8325IPW, the AD7683ACPZRL7 uniquely balances ultra-low standby current (1 nA), single-supply simplicity (2.7 V), and SPI-native interface - making it optimal for next-generation portable and energy-harvested measurement systems where size, power, and integration matter most.
Availability
AD7683ACPZRL7 is available at Aetrix Electronics and suitable for battery-powered equipment, medical instruments, process control systems, and portable instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7683ACPZRL7 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 AD7683ACPZRL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for low-power, high-accuracy data acquisition in portable, industrial, and medical applications where resolution, linearity, and energy efficiency are critical.
FAQ
What is the maximum clock frequency supported by the AD7683ACPZRL7 digital interface?
The AD7683ACPZRL7 supports a maximum DCLOCK frequency of 2.9 MHz, as specified in the Timing Specifications table. This allows full 16-bit data readout within the 10 µs conversion cycle. Operating above this limit risks timing violations and invalid data; actual usable clock rate depends on PCB trace length, load capacitance, and microcontroller drive strength - verified in Figure 2 of the AD7683ACPZRL7 datasheet.
Does the AD7683ACPZRL7 require an external reference voltage, and what are the acceptable ranges?
Yes, the AD7683ACPZRL7 requires an external reference voltage applied to the REF pin. The valid range is 0.5 V to VDD, with VDD between 2.7 V and 5.5 V. For example, with VDD = 3.3 V, REF may be set from 0.5 V to 3.3 V; with VDD = 5 V, REF may go up to 5 V. Reference decoupling with ≥2.2 µF ceramic capacitor to GND is mandatory for specified INL and noise performance per the AD7683ACPZRL7 application diagram.
Can the AD7683ACPZRL7 operate from a 2.7 V supply while maintaining full 16-bit performance?
Yes, the AD7683ACPZRL7 is fully specified at 2.7 V supply voltage, including 16-bit resolution with no missing codes, ±1 LSB typical INL (B grade), and 100 kSPS throughput. At 2.7 V, operating current is 560 µA at 100 kSPS and power dissipation drops to 1.5 mW. AC performance (e.g., SNR = 85 dB at 1 kHz) remains within datasheet limits, confirming full functionality across the entire 2.7 V–5.5 V range.
What is the purpose of the –IN pin on the AD7683ACPZRL7, and how should it be connected?
The –IN pin on the AD7683ACPZRL7 serves as the analog ground sense reference for the pseudo-differential input, enabling rejection of common-mode noise and elimination of ground loop errors. It must be connected either to the local analog ground plane or to a remote ground point near the signal source (e.g., sensor return). Floating –IN or tying it to VDD/GND without regard to signal source grounding degrades INL and introduces offset errors - as detailed in the Analog Input section of the AD7683ACPZRL7 datasheet.
Is the AD7683ACPZRL7 pin-compatible with the ADS8320 or ADS8325?
No, the AD7683ACPZRL7 is not pin-compatible with the ADS8320 or ADS8325. While the AD7683ACPZRL7 is described as an "improved second source" to those devices, it uses an 8-lead MSOP/QFN package with SPI interface, whereas the ADS8320/ADS8325 use 20-pin TSSOP packages and parallel interfaces. Pin count, pin functions, and physical layout differ fundamentally - requiring PCB redesign for substitution. The AD7683ACPZRL7 offers functional equivalence in resolution and speed, not mechanical compatibility.
AD7683ACPZRL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 8-VDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-LFCSP-WD (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7683ACPZRL7 FAQ
1.How can I place an order for AD7683ACPZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7683ACPZRL7 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 AD7683ACPZRL7 reliable?
The price and inventory of AD7683ACPZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7683ACPZRL7 is usually 5 days.
3.What payment methods are accepted for AD7683ACPZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7683ACPZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7683ACPZRL7?
AD7683ACPZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7683ACPZRL7 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 AD7683ACPZRL7?
For technical support, including AD7683ACPZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7683ACPZRL7 requirements.
6.How does Aetrix verify that AD7683ACPZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7683ACPZRL7 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 AD7683ACPZRL7 meets industry standards.
7.What is the process for return or replacement of AD7683ACPZRL7?
All AD7683ACPZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7683ACPZRL7, 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 AD7683ACPZRL7 part is unused and in its original packaging.
Return procedure for AD7683ACPZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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