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Analog Devices Inc. AD7851ARZ-REEL
- Part No.:
- AD7851ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7851ARZ-REEL.pdf
- Description:
- IC ADC 14BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,097
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Product details
Overview
AD7851ARZ-REEL from Analog Devices is a 14-bit, 333 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, features 2 LSB DNL (A grade), 60 mW typical power dissipation, and supports unipolar (0 V to VREF) and bipolar (±VREF/2) input ranges - used in high-speed DSP servo control and spectrum analysis systems.
For engineers reviewing the AD7851ARZ-REEL datasheet, AD7851ARZ-REEL pinout, AD7851ARZ-REEL application, or AD7851ARZ-REEL equivalent, key selection considerations include throughput rate at temperature (238 kSPS at 125°C), flexible SPI/QSPI/8051-compatible serial interface, power-down mode (5 µW typ), and guaranteed no-missed-codes performance across its operating range.
Technical Context
The AD7851ARZ-REEL implements a successive approximation register (SAR) architecture with integrated track-and-hold, charge redistribution DAC, and comparator. Its analog front-end supports two programmable input ranges via AMODE pin and includes internal reference buffering with external CREF1/CREF2 decoupling capacitors.
Calibration is managed through dedicated on-chip registers: automatic power-up self-calibration, user-initiated system calibration for offset/gain correction, and read/write access to calibration data. Serial communication uses five interface modes (including self-clocking), configurable via POLARITY, SM1, SM2, and SYNC pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete output codes for high-fidelity signal digitization. |
| Throughput Rate | 333 kSPS at –40°C to +85°C - enables real-time capture of signals up to ~20 MHz full-power bandwidth. |
| Differential Nonlinearity | ±2 LSB max - ensures monotonic transfer function and no missing codes over full temperature range. |
| Power Dissipation | 60 mW typ in normal mode - compatible with thermally constrained embedded systems. |
| Reference Voltage | 4.096 V internal - provides precise scaling for unipolar (0–4.096 V) or bipolar (±2.048 V) input ranges. |
| Supply Voltage | Single 5.0 V ±5% - simplifies power design by eliminating dual-rail or precision low-noise analog supplies. |
| Input Acquisition Time | 0.33 µs - allows accurate sampling of fast transients without external hold circuitry. |
Pinout & Package
AD7851ARZ-REEL is housed in a 24-lead SOIC package (R-24 footprint, 0.3 inch width), RoHS-compliant (Pb-free), reel-packed for automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start Input | Edge-triggered command initiating track-to-hold transition and ADC conversion sequence. |
| BUSY | Conversion Status Output | Active-high open-drain signal indicating active conversion or calibration; used for handshaking. |
| SLEEP | Power-Down Control | Logic-low entry into ultra-low-power mode (5 µW typ); retains calibration memory. |
| REFIN/REFOUT | Reference I/O | Provides 4.096 V internal reference output or accepts external reference (4 V to AVDD). |
| AIN(+), AIN(–) | Pseudo-Differential Analog Inputs | Supports two input ranges: 0–VREF (unipolar) or ±VREF/2 (bipolar) with common-mode biasing. |
| AMODE | Analog Range Select | Configures input range: logic 0 = 0 to VREF; logic 1 = –VREF/2 to +VREF/2. |
| DIN, DOUT, SCLK, SYNC | Serial Interface Signals | Enable SPI/QSPI/8051-compatible bidirectional data transfer with configurable polarity and timing modes. |
| CAL | Calibration Trigger | Initiates on-chip self-calibration or system calibration sequence upon rising edge. |
| AGND, DGND | Analog/Digital Grounds | Separate ground returns minimize noise coupling between sensitive analog and noisy digital sections. |
Key Features
| Feature | Design Value |
|---|---|
| Self and system calibration | On-chip calibration engine corrects offset/gain errors over temperature; supports user-read/write calibration registers. |
| Flexible serial interface | Five programmable modes (including self-clocking) ensure interoperability with 8051, SPI, QSPI, and P-compatible controllers. |
| Pseudo-differential input | Two selectable input ranges (0–VREF or ±VREF/2) improve noise rejection and dynamic range in mixed-signal environments. |
| Low-power operation | 60 mW typical active power and 5 µW sleep mode enable battery-powered or thermally limited applications. |
| No-missed-codes guarantee | Monotonic 14-bit transfer function ensured across full operating temperature range (–40°C to +85°C). |
Applications
| DSP Servo Control | Spectrum Analysis |
|---|---|
Use Scenario: Real-time position/velocity feedback loop in motor control systems requiring sub-µs latency and high SNR. IC Role / Device Role / Timing Role: High-speed ADC capturing encoder or current-sense signals for closed-loop PID computation. Use Value: 333 kSPS throughput and 77 dB SNR enable accurate reconstruction of mechanical resonance frequencies up to 20 MHz. |
Use Scenario: Digitizing RF or audio band signals for FFT-based spectral decomposition in test equipment. IC Role / Device Role / Timing Role: Front-end ADC providing time-domain samples to DSP for frequency-domain analysis. Use Value: 14-bit resolution and –86 dB THD preserve harmonic integrity essential for identifying spurious tones and intermodulation products. |
| Instrumentation & Control | High-Speed Modems |
Use Scenario: Precision data acquisition in industrial PLC modules measuring sensor outputs under varying thermal conditions. IC Role / Device Role / Timing Role: Calibrated ADC delivering stable measurements despite ambient drift, using on-chip reference and self-calibration. Use Value: Guaranteed ±2 LSB DNL and automatic power-up calibration reduce need for field recalibration and extend maintenance intervals. |
Use Scenario: Baseband signal sampling in V.34/V.90 modem designs requiring wide dynamic range and low distortion. IC Role / Device Role / Timing Role: ADC converting analog line signals to digital domain for adaptive equalization and echo cancellation. Use Value: Bipolar ±VREF/2 input range accommodates AC-coupled signals; 20 MHz full-power bandwidth supports >10 Mbps symbol rates. |
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 |
|---|---|---|---|
| AD7852BRZ | 14-bit, 250 kSPS, internal 2.5 V reference, SOIC-24, no system calibration support. | Lacks programmable input range and system calibration; suited for fixed-range, lower-throughput applications. | Select when cost-sensitive designs require simpler calibration and tolerate reduced speed. |
| ADS8325IPW | 16-bit, 100 kSPS, SPI-only interface, 3.3 V supply, external reference only, TSSOP-16. | Higher resolution but slower; requires external reference and level-shifting for 5 V systems. | Choose for precision DC measurement where throughput <100 kSPS suffices and 16-bit accuracy is critical. |
Compared with AD7851ARZ-REEL, AD7852BRZ trades throughput and calibration flexibility for lower cost and simpler integration, while ADS8325IPW prioritizes resolution over speed and demands tighter supply and reference management - making AD7851ARZ-REEL optimal for 5 V, high-speed, calibrated mixed-signal systems.
Availability
AD7851ARZ-REEL is available at Aetrix Electronics and suitable for DSP servo control, spectrum analysis, and instrumentation & control applications requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for AD7851ARZ-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 AD7851ARZ-REEL belongs to Analog Devices' precision SAR ADC product line, engineered for high-speed, calibrated data acquisition in demanding industrial, automotive, and communications systems.
FAQ
What is the maximum operating temperature range for AD7851ARZ-REEL?
The AD7851ARZ-REEL is rated for operation from –40°C to +85°C. While the A-grade specification guarantees performance up to +125°C, the AD7851ARZ-REEL variant is characterized and warranted only to +85°C per the ordering guide. At 125°C, throughput reduces to 238 kSPS, but this condition does not apply to the ARZ-REEL version.
Does AD7851ARZ-REEL require external reference components?
Yes, AD7851ARZ-REEL requires two external capacitors: a 0.1 µF ceramic + 470 nF tantalum parallel network on CREF1, and a 0.01 µF ceramic capacitor on CREF2. These stabilize the internal 4.096 V reference and support DAC charge redistribution during conversion - omission degrades DNL and SNR performance.
Can AD7851ARZ-REEL interface directly with an 8051 microcontroller?
Yes, AD7851ARZ-REEL supports Mode 1 (2-wire 8051 interface) via DIN/DOUT sharing and SCLK synchronization. The part's native compatibility eliminates need for protocol translation or glue logic - CONVST, BUSY, and SYNC pins provide hardware handshaking aligned with 8051 timing constraints.
How does the AMODE pin affect input configuration in AD7851ARZ-REEL?
The AMODE pin selects input range: logic low configures unipolar 0 V to VREF (AIN+ ≥ AIN−), while logic high enables bipolar ±VREF/2 (AIN− biased to VREF/2, AIN+ swings symmetrically). This setting determines transfer function coding (straight binary vs. two's complement) and must be stable before conversion starts.
Is AD7851ARZ-REEL pin-compatible with other AD7851 package variants?
Yes, AD7851ARZ-REEL shares identical 24-lead SOIC (R-24) pinout and electrical behavior with AD7851AR, AD7851AR-REEL, and AD7851ARZ3. All share the same pin functions, timing, and register map - enabling drop-in replacement within SOIC-based designs regardless of reel/packaging suffix.
AD7851ARZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 333k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI
- 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 ~ 125°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7851ARZ-REEL FAQ
1.How can I place an order for AD7851ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7851ARZ-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 AD7851ARZ-REEL reliable?
The price and inventory of AD7851ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7851ARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7851ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7851ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7851ARZ-REEL?
AD7851ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7851ARZ-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 AD7851ARZ-REEL?
For technical support, including AD7851ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7851ARZ-REEL requirements.
6.How does Aetrix verify that AD7851ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7851ARZ-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 AD7851ARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7851ARZ-REEL?
All AD7851ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7851ARZ-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 AD7851ARZ-REEL part is unused and in its original packaging.
Return procedure for AD7851ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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