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Analog Devices Inc. AD7946BCPZRL7
- Part No.:
- AD7946BCPZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
AD7946BCPZRL7.pdf
- Description:
- IC ADC 14BIT SAR 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,057
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Product details
Overview
AD7946BCPZRL7 from Analog Devices is a 14-bit, 500 kSPS charge redistribution successive approximation ADC with pseudo-differential analog input (0 V to REF), no pipeline delay, and SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface. It operates from a single 5 V supply with 1.8 V–5 V logic interface (VIO), delivers ±1 LSB INL max and 85 dB SINAD at 20 kHz, and targets precision data acquisition in battery-powered instrumentation.
For engineers reviewing the AD7946BCPZRL7 datasheet, AD7946BCPZRL7 pinout, AD7946BCPZRL7 application, or AD7946BCPZRL7 equivalent, key selection criteria include its 10-lead LFCSP package, 2.5 ns aperture delay, daisy-chain capability, 1 nA standby current, and pin-for-pin compatibility with the AD7686 - all critical for low-power, multi-channel, space-constrained embedded measurement systems.
Technical Context
The AD7946BCPZRL7 implements a charge redistribution SAR architecture with on-chip track-and-hold, enabling true single-cycle conversion without latency. Its internal conversion clock eliminates SCK dependency during sampling, and the proprietary serial interface supports CS-mode (3- or 4-wire) and chain-mode configurations with BUSY indicator.
It features dual supply domains: VDD (4.5–5.5 V) powers the analog core and reference path, while VIO (1.8–5.5 V) independently supplies digital I/O, allowing interoperability with mixed-voltage host controllers. The pseudo-differential input rejects common-mode noise up to 65 dB at 200 kHz, and acquisition time is fixed at 400 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes - guarantees monotonicity and full code coverage across full temperature range. |
| Throughput | 500 kSPS maximum - enables real-time capture of signals up to ~200 kHz Nyquist bandwidth. |
| INL | ±1 LSB max (±0.0061% FSR) - ensures high absolute accuracy for calibration-critical applications like medical sensors. |
| SINAD | 85 dB at 20 kHz (REF = 5 V) - supports >13.7 ENOB for high-fidelity signal reconstruction. |
| Aperture Delay | 2.5 ns - minimizes sampling uncertainty for wideband analog inputs and simplifies anti-aliasing filter design. |
| Power @ 100 kSPS | 3.3 mW (5 V) - enables continuous high-speed operation in thermally constrained portable devices. |
| Standby Current | 1 nA - allows microamp-level system sleep states without external power gating. |
| Analog Input Range | 0 V to REF (REF = 0.5 V to VDD) - supports flexible scaling with external references down to 0.5 V for low-voltage sensor interfaces. |
Pinout & Package
The AD7946BCPZRL7 is housed in a 10-lead 3 mm × 3 mm LFCSP (lead-frame chip-scale package) with exposed pad (EPAD) that must be connected to GND for thermal and EMI performance. Pin 1 is REF; pin 10 is VIO; EPAD is electrically tied to GND but not required for basic electrical functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Analog reference input | Accepts external reference voltage (0.5 V to VDD); requires local 10 µF decoupling to maintain SNR and reduce reference noise coupling. |
| 2 - VDD | Analog power supply | 4.5–5.5 V supply for ADC core and internal reference buffer; separate from digital I/O domain. |
| 3 - IN+ | Pseudo-differential analog input (+) | Input voltage measured relative to IN−; full-scale range = REF − 0 V; supports 0.5 V to 5 V common-mode swing. |
| 4 - IN− | Pseudo-differential analog input (−) | Ground sense node; connects to remote analog ground to reject ground loop errors in sensor interfaces. |
| 5 - GND | Power ground | Common return for VDD and analog circuitry; must be low-impedance and separated from digital ground where possible. |
| 6 - CNV | Convert control input | Rising edge initiates conversion and selects interface mode (CS vs. chain); doubles as chip select in CS mode. |
| 7 - SDO | Serial data output | 14-bit straight-binary output synchronized to SCK falling edge; tri-state when CNV/SDI inactive in CS mode. |
| 8 - SCK | Serial clock input | Drives data readout timing; minimum period 15 ns (VIO > 4.5 V); independent of conversion clock. |
| 9 - SDI | Serial data input / mode select | High at CNV rising edge selects CS mode; low selects chain mode; enables daisy-chaining of multiple AD7946BCPZRL7 units. |
| 10 - VIO | Digital I/O supply | 1.8–5.5 V logic interface supply; sets VIH/VIL thresholds and drives SDO output levels; isolates digital noise from analog section. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Conversion result available immediately after tCONV (≤1.6 µs); eliminates latency-induced phase error in closed-loop control. |
| Daisy-chain capability | Single SDO line supports cascaded readout of ≥2 AD7946BCPZRL7 devices using SDI as data-in, reducing PCB routing complexity. |
| Multi-voltage logic interface | VIO pin enables direct connection to 1.8 V, 2.5 V, 3 V, or 5 V microcontrollers without level shifters. |
| Linear power scaling | Power dissipation scales from 3.3 µW (100 SPS) to 19 mW (500 kSPS); supports dynamic throughput adjustment for energy optimization. |
| Pin-for-pin compatibility with AD7686 | Enables drop-in upgrade path from 16-bit AD7686 in existing MSOP/LFCSP layouts without redesign. |
| Low aperture jitter | 2.5 ns aperture delay with <100 fs jitter contribution - preserves SNR for high-frequency input signals. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of ECG, EEG, or pressure transducer outputs in handheld diagnostic tools with 24/7 operation on coin-cell batteries. IC Role / Device Role / Timing Role: Primary precision ADC capturing analog biosignals at ≤500 kSPS with minimal power overhead and no latency-induced waveform distortion. Use Value: 1 nA standby current extends battery life to years in sleep mode; 85 dB SINAD ensures clinical-grade signal fidelity without post-processing correction. | Use Scenario: Remote environmental monitoring nodes measuring temperature, humidity, and gas concentration over months between USB recharges. IC Role / Device Role / Timing Role: Low-power SAR ADC performing burst-mode sampling triggered by wake-up interrupts, then returning to ultra-low-power state. Use Value: 3.3 µW at 100 SPS enables >10-year operation on primary lithium cells; pseudo-differential input rejects noise from long sensor cables. |
| Industrial Process Controllers | Lab Instrumentation Front Ends |
Use Scenario: Multi-channel analog input modules in PLCs acquiring 4–20 mA loop signals, thermocouple voltages, and RTD bridges in factory automation cabinets. IC Role / Device Role / Timing Role: High-accuracy ADC with ±1 LSB INL and 65 dB CMRR used per channel to digitize isolated sensor outputs before FPGA processing. Use Value: Pin compatibility with AD7686 allows reuse of validated PCB footprints; daisy-chain mode reduces SPI bus loading across 8+ channels. | Use Scenario: Modular oscilloscopes and spectrum analyzers requiring 14-bit resolution, 500 kSPS throughput, and clean spectral performance up to 200 kHz. IC Role / Device Role / Timing Role: Precision front-end ADC providing calibrated digitization with 85 dB SINAD and −100 dB THD for lab-grade signal analysis. Use Value: 2.5 ns aperture delay and 9 MHz input bandwidth enable accurate time-domain capture; low leakage (<1 nA) prevents DC drift in high-impedance probe interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7686BCPZRL7 | 16-bit resolution, same 10-lead LFCSP package and pinout; higher INL (±1.5 LSB max), lower throughput (250 kSPS), higher power (7.5 mW @ 100 kSPS). | Used where absolute accuracy >14-bit is mandatory (e.g., metrology calibrators), accepting reduced speed and higher power. | Select AD7686BCPZRL7 only if 16-bit resolution is required and 250 kSPS suffices; AD7946BCPZRL7 offers better speed/power trade-off for most 14-bit use cases. |
| ADS8860IRGET | 16-bit, 1 MSPS, SPI-compatible, 10-lead VSSOP; requires external reference; no daisy-chain support; higher supply current (1.5 mA @ 1 MSPS). | Preferred in high-throughput industrial DAQ where board space permits VSSOP and external ref simplifies system BOM. | Choose ADS8860IRGET for >500 kSPS needs with 16-bit resolution; AD7946BCPZRL7 is superior for ultra-low-power, daisy-chain, or integrated-ref designs. |
Compared with AD7686BCPZRL7 and ADS8860IRGET, the AD7946BCPZRL7 uniquely balances 500 kSPS throughput, 14-bit no-missing-codes linearity, sub-µA standby, and native daisy-chain support - making it optimal for compact, battery-aware, multi-channel measurement systems where 14-bit resolution is sufficient.
Availability
AD7946BCPZRL7 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial process controllers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AD7946BCPZRL7 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, with R&D centers worldwide.
The AD7946BCPZRL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, designed specifically for high-resolution, low-latency, low-power data acquisition in portable, industrial, and medical instrumentation where accuracy, size, and energy efficiency are critical.
FAQ
What is the maximum recommended reference voltage for the AD7946BCPZRL7?
The AD7946BCPZRL7 supports an external reference voltage (REF) from 0.5 V to VDD. Since VDD is specified from 4.5 V to 5.5 V, the maximum REF is 5.5 V. However, typical operation uses REF = VDD = 5 V, which yields optimal AC performance (85 dB SINAD) and aligns with the 14-bit full-scale range of 0 V to 5 V. Using REF > VDD is not permitted per Absolute Maximum Ratings.
Does the AD7946BCPZRL7 require an external clock for conversion?
No, the AD7946BCPZRL7 does not require an external clock for conversion. It contains an internal conversion clock, so sampling and conversion are initiated solely by the CNV rising edge. The SCK signal is used only for serial data readout and is independent of the conversion timing - enabling flexible interface timing and eliminating clock synchronization overhead in the AD7946BCPZRL7 design.
Can the AD7946BCPZRL7 operate with a 1.8 V digital interface while using a 5 V analog supply?
Yes, the AD7946BCPZRL7 supports independent analog and digital supplies: VDD = 5 V powers the ADC core and reference path, while VIO = 1.8 V supplies the digital I/O (SDI, SCK, SDO, CNV). This configuration is explicitly supported per datasheet specifications (VIO range: 1.8 V to VDD + 0.3 V), ensuring correct logic thresholds and output drive strength without level shifters - a key feature of the AD7946BCPZRL7.
What is the purpose of the IN− pin on the AD7946BCPZRL7?
The IN− pin on the AD7946BCPZRL7 serves as the pseudo-differential ground sense node. It establishes the common-mode reference for the IN+ input, enabling rejection of shared noise (e.g., ground bounce, EMI) between sensor and ADC. Unlike fully differential ADCs, IN− is not actively driven but should connect to analog ground or a remote sensor ground to eliminate potential differences - a critical layout requirement for maintaining the AD7946BCPZRL7's 65 dB CMRR.
Is the AD7946BCPZRL7 pin-compatible with other devices in the PulSAR family?
Yes, the AD7946BCPZRL7 is pin-for-pin compatible with the 16-bit AD7686 in both 10-lead MSOP and 10-lead LFCSP packages, as confirmed in the datasheet Table 1 and General Description. This allows direct hardware replacement in existing designs. However, it is not pin-compatible with other PulSAR variants (e.g., AD7942, AD7980) due to differing pin functions and counts - compatibility applies strictly to the AD7686 per AD7946BCPZRL7 documentation.
AD7946BCPZRL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-VFDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 500k
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-LFCSP-WD (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7946BCPZRL7 FAQ
1.How can I place an order for AD7946BCPZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7946BCPZRL7 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 AD7946BCPZRL7 reliable?
The price and inventory of AD7946BCPZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7946BCPZRL7 is usually 5 days.
3.What payment methods are accepted for AD7946BCPZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7946BCPZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7946BCPZRL7?
AD7946BCPZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7946BCPZRL7 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 AD7946BCPZRL7?
For technical support, including AD7946BCPZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7946BCPZRL7 requirements.
6.How does Aetrix verify that AD7946BCPZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7946BCPZRL7 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 AD7946BCPZRL7 meets industry standards.
7.What is the process for return or replacement of AD7946BCPZRL7?
All AD7946BCPZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7946BCPZRL7, 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 AD7946BCPZRL7 part is unused and in its original packaging.
Return procedure for AD7946BCPZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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