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Analog Devices Inc. AD7851KR-REEL
- Part No.:
- AD7851KR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7851KR-REEL.pdf
- Description:
- IC ADC 14BIT SRL 333KSPS 24-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:9,000
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Product details
Overview
AD7851KR-REEL from Analog Devices is a 14-bit, 285 kSPS serial analog-to-digital converter (ADC) with pseudo-differential input, on-chip 4.096 V reference, and self/system calibration capability. It operates from a single 5 V supply, delivers ±1 LSB DNL (K grade), supports dual input ranges (0 V to VREF and ±VREF/2), and targets high-speed data acquisition in DSP-based control systems.
For engineers reviewing the AD7851KR-REEL datasheet, AD7851KR-REEL pinout, AD7851KR-REEL application, or AD7851KR-REEL equivalent, this page provides verified technical context, real-world design meanings for key specs, validated SOIC-24 pin functions, confirmed K-grade performance at 0°C to +85°C, and two rigorously cross-checked alternative ADCs for similar high-speed, calibrated 14-bit serial conversion roles.
Technical Context
The AD7851KR-REEL implements a successive approximation register (SAR) architecture with integrated track-and-hold, charge redistribution DAC, and comparator. Its calibration engine supports both automatic power-up self-calibration and user-initiated system calibration to correct offset and gain errors across temperature and time.
It features a flexible serial interface supporting five modes-including SPI/QSPI-compatible (Mode 2/3), 8051-compatible (Mode 1), and self-clocking (Modes 4/5)-with programmable polarity and synchronous timing controlled via SYNC, SCLK, DIN, and DOUT. The AMODE pin selects between unipolar (0 V to VREF) and bipolar (±VREF/2) input ranges, while CAL and SLEEP enable calibration and low-power operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete output codes for high-fidelity signal digitization in spectrum analysis or servo feedback loops. |
| Throughput Rate | 285 kSPS at 0°C to +85°C - enables real-time sampling of audio-band signals up to ~142 kHz Nyquist frequency. |
| Differential Nonlinearity | ±1 LSB max (K grade) - guarantees no missing codes and monotonic transfer function critical for closed-loop control stability. |
| Input Voltage Ranges | 0 V to VREF (unipolar) or ±VREF/2 (bipolar) - allows direct interfacing to transducer outputs or op-amp stages without external level-shifting. |
| Power Dissipation | 63 mW typical (normal mode), 5.25 µW typical (full sleep) - supports battery-powered instrumentation with dynamic power scaling. |
| Reference | Internal 4.096 V ±0.5% (REFIN/REFOUT pin) - eliminates need for external precision reference in cost-sensitive designs. |
| Serial Interface | 5-mode configurable (SPI/QSPI/8051/self-clocking) - ensures compatibility with diverse microcontrollers including ADSP-21xx and TMS320C2x families. |
Pinout & Package
AD7851KR-REEL is housed in a 24-lead SOIC package (R-24 footprint, 0.3 inch width), RoHS-compliant and tape-and-reel packaged (REEL suffix). Pin assignments are identical across PDIP, SOIC, and SSOP variants per Analog Devices' ordering guide and pinout diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start input | Edge-triggered command initiating track-to-hold transition and ADC conversion; tied high when unused. |
| BUSY | Conversion status output | Active-high open-drain signal indicating active conversion or calibration; used for handshaking in interrupt-driven firmware. |
| SLEEP | Power-down control | Logic-low entry into ultra-low-power mode (5.25 µW); retains calibration memory and resumes operation without recalibration. |
| REFIN/REFOUT | Reference I/O | Provides internal 4.096 V reference; accepts external reference up to AVDD; requires CREF1/CREF2 decoupling capacitors. |
| AIN(+), AIN(–) | Pseudo-differential analog inputs | Supports ratiometric or ground-referenced measurements; AMODE pin configures range (0–VREF or ±VREF/2). |
| DIN, DOUT, SCLK, SYNC | Serial interface signals | Enable full-duplex or half-duplex communication; POLARITY and AMODE pins configure clock edge and data format. |
| CAL | Calibration trigger | Initiates on-chip self-calibration or system calibration sequence; BUSY goes high during execution (typ. 4.63–41.7 ms). |
| AGND, DGND | Analog/digital ground | Separate ground pins require star-point connection to minimize noise coupling between analog and digital sections. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5 V supply operation | Eliminates dual-rail power design complexity and reduces BOM count in industrial sensor nodes and portable test equipment. |
| On-chip 4.096 V reference with REFOUT | Enables fully self-contained ADC operation; reference accuracy (±0.5%) and tempco (50 ppm/°C) support 14-bit linearity over 0°C–85°C. |
| System + self-calibration with read/write registers | Allows field correction of sensor chain gain/offset drift; calibration coefficients stored in nonvolatile memory survive power cycles. |
| Pseudo-differential input with AMODE selection | Permits flexible front-end design: unipolar mode for single-ended sensors, bipolar mode for AC-coupled signals like audio or vibration. |
| Five serial interface modes | Ensures drop-in compatibility with legacy 8051, modern SPI controllers, and DSPs (ADSP-21xx, TMS320C2x) without protocol translation hardware. |
| Low-power sleep mode (5.25 µW) | Extends battery life in wireless data loggers; wake-up latency <1 µs allows rapid response to external triggers via CONVST or CAL. |
Applications
| Digital Signal Processing | Instrumentation & Control Systems |
|---|---|
Use Scenario: Real-time spectral analysis of motor current harmonics in predictive maintenance systems. IC Role / Device Role / Timing Role: High-speed digitizer capturing 285 kSPS samples synchronized to PWM switching events via CONVST edge triggering. Use Value: 14-bit resolution and ±1 LSB DNL ensure accurate amplitude measurement of 3rd/5th harmonics for fault signature detection. |
Use Scenario: Closed-loop position control in CNC machine tool servo drives. IC Role / Device Role / Timing Role: ADC feeding feedback loop of PID controller; bipolar input range (±VREF/2) accommodates differential encoder signals. Use Value: On-chip calibration maintains 12-bit effective resolution over temperature, preventing positional drift during extended runtime. |
| Speech Recognition & Synthesis | Automotive Sensor Interface |
Use Scenario: Voice capture in in-vehicle infotainment systems with acoustic echo cancellation. IC Role / Device Role / Timing Role: Audio channel ADC operating in unipolar mode (0–VREF), interfaced to ADSP-21xx DSP via SPI Mode 2. Use Value: 78 dB SNR and –90 dB THD preserve voice fidelity for neural network feature extraction at 285 kSPS. |
Use Scenario: Digitizing piezoelectric knock sensor outputs in engine control units (ECUs). IC Role / Device Role / Timing Role: High-bandwidth ADC (20 MHz FPBW) capturing transient knock events; SLEEP pin enables duty-cycled acquisition. Use Value: Full-power bandwidth exceeds 10× required resonance frequency (~5–10 kHz), ensuring undistorted transient capture for combustion timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7851AR-REEL | A-grade variant: ±2 LSB DNL, rated –40°C to +85°C, 333 kSPS throughput. | Suitable for wider temperature range and higher speed; lacks K-grade's tighter DNL spec. | Select when system requires extended cold-start operation or higher sampling rate, accepting ±2 LSB DNL. |
| ADS8325IPW | Texas Instruments 16-bit SAR ADC; 100 kSPS, SPI-only interface, external reference required. | Higher resolution but lower speed; no on-chip reference or calibration; requires external 4.096 V ref and op-amp driver. | Select when absolute accuracy >14-bit is mandatory and throughput ≤100 kSPS suffices; adds BOM cost and layout complexity. |
Compared with AD7851KR-REEL, AD7851AR-REEL trades DNL tightness for broader temperature coverage and higher speed, while ADS8325IPW sacrifices throughput and integration for 2 extra bits of resolution-making AD7851KR-REEL optimal for cost-constrained, temperature-stable, medium-speed industrial data acquisition.
Availability
AD7851KR-REEL is available at Aetrix Electronics and suitable for digital signal processing, instrumentation and control systems, speech recognition, and automotive sensor interface applications requiring stable component supply and long-term manufacturability.
Supply support for AD7851KR-REEL 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 AD7851 belongs to Analog Devices' precision high-speed data acquisition product line, designed specifically for applications demanding calibrated 14-bit performance, flexible serial interfacing, and single-supply operation in industrial and automotive environments.
FAQ
What is the guaranteed differential nonlinearity (DNL) specification for AD7851KR-REEL?
The AD7851KR-REEL is a K-grade device with guaranteed ±1 LSB maximum DNL over its specified temperature range (0°C to +85°C). This ensures monotonicity and absence of missing codes-critical for control loop stability and accurate waveform reconstruction. The specification is validated post-calibration and applies at 285 kSPS throughput with 5 V supply and 4.096 V reference.
Does AD7851KR-REEL include an internal voltage reference?
Yes, AD7851KR-REEL integrates a factory-trimmed 4.096 V reference accessible via the REFIN/REFOUT pin. It exhibits ±0.5% initial accuracy and 50 ppm/°C temperature coefficient, enabling standalone operation without external references. When using the internal reference, external capacitors CREF1 (0.1 µF) and CREF2 (0.01 µF) must be connected to AGND per the datasheet layout guidelines.
How does the AMODE pin affect analog input configuration on AD7851KR-REEL?
The AMODE pin on AD7851KR-REEL selects between two analog input ranges: logic low configures unipolar mode (0 V to VREF), where AIN(+) must remain ≥ AIN(–); logic high enables bipolar mode (±VREF/2), allowing AIN(+) to swing below AIN(–) down to AGND. This flexibility supports both single-ended sensor interfaces and differential AC signal acquisition without external level-shifting circuitry.
What serial interface modes does AD7851KR-REEL support, and how are they selected?
AD7851KR-REEL supports five serial interface modes selected by control register bits and pin states: Mode 1 (8051-compatible 2-wire), Modes 2–3 (SPI/QSPI 3-wire), and Modes 4–5 (self-clocking with SCLK output). Configuration is done via the CONTROL REGISTER and POLARITY pin; no hardware strapping is required beyond standard DIN/DOUT/SCLK/SYNC connections.
Can AD7851KR-REEL perform system calibration with external components?
Yes, AD7851KR-REEL supports system calibration using external precision voltage sources applied to AIN(+) and AIN(–). The process adjusts internal offset and gain calibration registers to compensate for errors introduced by external front-end circuitry (e.g., op-amps, filters). Calibration data is retained in on-chip memory and survives power cycles, enabling field recalibration without firmware updates.
AD7851KR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 333k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- 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 ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7851KR-REEL FAQ
1.How can I place an order for AD7851KR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7851KR-REEL 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 AD7851KR-REEL reliable?
The price and inventory of AD7851KR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7851KR-REEL is usually 5 days.
3.What payment methods are accepted for AD7851KR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7851KR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7851KR-REEL?
AD7851KR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7851KR-REEL 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 AD7851KR-REEL?
For technical support, including AD7851KR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7851KR-REEL requirements.
6.How does Aetrix verify that AD7851KR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7851KR-REEL 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 AD7851KR-REEL meets industry standards.
7.What is the process for return or replacement of AD7851KR-REEL?
All AD7851KR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7851KR-REEL, 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 AD7851KR-REEL part is unused and in its original packaging.
Return procedure for AD7851KR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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