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Analog Devices Inc. AD7871JP-REEL
- Part No.:
- AD7871JP-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
AD7871JP-REEL.pdf
- Description:
- IC ADC 14BIT SAR 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,055
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Product details
Overview
AD7871JP-REEL from Analog Devices is a complete monolithic 14-bit LC2MOS sampling ADC with integrated track-and-hold, 3 V buried Zener reference, and self-contained laser-trimmed 2 MHz clock. It delivers 83 kSPS throughput, 80 dB SNR at 10 kHz, 57 ns data access time, and operates from ±5 V supplies with ±3 V bipolar analog input range. It is used in high-speed DSP servo control and spectrum analysis systems requiring precise, low-noise digitization.
For engineers reviewing the AD7871JP-REEL datasheet, AD7871JP-REEL pinout, AD7871JP-REEL application, or AD7871JP-REEL equivalent, key selection criteria include its 14-bit resolution with ±1 LSB integral nonlinearity, parallel/byte/serial interface flexibility, internal reference stability (±40 ppm/°C), and 2 µs track/hold acquisition time for dynamic signal fidelity.
Technical Context
The AD7871JP-REEL implements a successive approximation register (SAR) architecture with a voltage-output DAC and high-speed comparator. Its on-chip 3 V buried Zener reference is temperature-compensated and factory-trimmed, providing both DAC reference and bipolar bias without external components.
It supports three synchronous data output formats-14-bit parallel, two 8-bit bytes, or 14-bit serial-controlled by the 14/8/CLK pin state. Conversion is initiated either by CONVST rising edge (Mode 1) or CS falling edge (Mode 2), with BUSY/INT indicating completion and RD enabling data readout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees no missing codes over full scale |
| SNR @ 10 kHz | 80 dB min - enables high-fidelity digitization of audio and IF signals |
| Throughput Rate | 83 kSPS - supports real-time sampling up to 41.5 kHz full-power input |
| Data Access Time | 57 ns max - allows direct interfacing with fast microprocessors without wait states |
| Power Dissipation | 50 mW typ - reduces thermal load in dense mixed-signal PCB layouts |
| Analog Input Range | ±3 V - compatible with standard op amp output stages and bipolar sensor interfaces |
| Reference Output | 3.00 V ±10 mV - stable internal reference usable for external circuit biasing |
Pinout & Package
AD7871JP-REEL is housed in a 28-pin plastic DIP (PDIP) package with 0.6-inch body width and through-hole mounting. Pin assignments are fully defined per Analog Devices Rev. E datasheet Figure 5 and Table 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST (Pin 1) | Asynchronous conversion trigger | Rising edge initiates hold mode; enables precise timing-critical sampling in DSP applications |
| CS (Pin 2) | Chip select enable | Active-low input that selects device and can initiate conversion when CONVST is tied low |
| RD (Pin 3) | Data read strobe | Active-low signal enabling three-state DBx outputs during data transfer |
| BUSY/INT (Pin 4) | Status indicator | Open-drain logic-low output signaling conversion in progress or completion interrupt |
| CLK (Pin 5) | External clock input | TTL-compatible input; tying to VSS enables internal 2 MHz oscillator |
| DB13/HBEN (Pin 6) | MSB output or byte-select control | Function depends on 14/8/CLK state: DB13 in 14-bit mode, HBEN for upper/lower byte selection in byte mode |
| VIN (Pin 26) | Analog input | ±3 V differential input referenced to AGND; 15 kΩ typical input impedance |
| REFOUT (Pin 25) | Reference voltage source | 3.00 V output capable of sourcing 500 µA; requires ≤50 pF capacitive load for stability |
| CREF (Pin 23) | Reference decoupling node | Connection point for 10 nF capacitor to AGND to minimize reference noise |
| 14/8/CLK (Pin 28) | Interface mode selector | +5 V = 14-bit parallel only; 0 V = byte + serial; −5 V = byte + continuous serial clock |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3 V buried Zener reference | Factory-trimmed to ±10 mV at +25°C with ±40 ppm/°C tempco - eliminates need for external reference and calibration |
| Three configurable digital interfaces | Selectable 14-bit parallel, dual-byte, or 14-bit serial output - enables compatibility with 8-bit, 16-bit, and serial microcontrollers without glue logic |
| Self-contained internal clock | Laser-trimmed 2 MHz oscillator - removes external timing components and reduces board area and EMI susceptibility |
| Low power consumption | 50 mW typical at 83 kSPS - suitable for portable and thermally constrained instrumentation designs |
| Fast track/hold acquisition | ≤2 µs to 14-bit accuracy - preserves signal integrity for wideband inputs up to 500 kHz 0.1 dB bandwidth |
Applications
| Digital Signal Processing (DSP) Systems | High-Speed Modems |
|---|---|
Use Scenario: Real-time acquisition of baseband I/Q signals in software-defined radio front ends. IC Role / Device Role / Timing Role: ADC digitizes analog IF signals at 83 kSPS with <2 µs acquisition time to maintain phase coherence across sample windows. Use Value: 80 dB SNR ensures >12 ENOB for accurate FFT-based spectral estimation and channel equalization. | Use Scenario: Analog front end for V.34/V.90 modem chipsets requiring precise line signal sampling. IC Role / Device Role / Timing Role: Provides synchronized 14-bit digitization of telephone line voltages with programmable interface timing to match DSP bus protocols. Use Value: Parallel/byte interface modes allow direct connection to TI TMS320Cxx or ADSP-21xx processors without FIFO buffering. |
| Spectrum Analysis Equipment | DSP Servo Control Loops |
Use Scenario: Input stage of benchtop spectrum analyzers capturing transient RF envelope signals. IC Role / Device Role / Timing Role: ADC samples up to 41.5 kHz full-power sine waves with ±1 LSB INL to preserve harmonic distortion measurements. Use Value: −86 dB THD and −86 dB IMD support accurate multi-tone intermodulation testing per IEEE 1057. | Use Scenario: Position feedback digitization in industrial motion controllers using resolver or LVDT sensors. IC Role / Device Role / Timing Role: Converts conditioned ±3 V analog position signals into 14-bit digital words synchronized to PWM update cycles. Use Value: Internal 3 V reference and bipolar input eliminate external level-shifting, reducing component count and drift-induced error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7871JRZ-REEL | Same electrical specs; RoHS-compliant 28-pin SOIC package instead of PDIP | Preferred for surface-mount production and higher-density PCBs; requires re-layout for footprint | Select AD7871JRZ-REEL for automated assembly and space-constrained designs where thermal performance permits SOIC mounting. |
| ADS8320U | 16-bit SAR ADC, 100 kSPS, SPI interface only, external reference required | Higher resolution but lacks parallel/byte interface and internal reference; needs external 2.5 V reference and level-shifting for ±3 V input | Choose ADS8320U only if 16-bit resolution is mandatory and system design accommodates external reference and interface redesign. |
Compared with AD7871JP-REEL, AD7871JRZ-REEL offers identical functionality in a smaller SOIC package but requires PCB redesign, while ADS8320U trades interface flexibility and integration for higher resolution and speed-making it unsuitable as a drop-in replacement without hardware and firmware changes.
Availability
AD7871JP-REEL is available at Aetrix Electronics and suitable for digital signal processing, high-speed modems, and spectrum analysis applications requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for AD7871JP-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 AD7871JP-REEL belongs to the AD7871/AD7872 family of complete monolithic sampling ADCs designed specifically for demanding DSP and communications applications where integration, dynamic performance, and interface flexibility are critical.
FAQ
What is the maximum analog input frequency supported by the AD7871JP-REEL?
The AD7871JP-REEL can accurately convert full-power analog signals up to 41.5 kHz, as specified in the General Description. This limit arises from its 83 kSPS throughput rate and Nyquist criterion. The track-and-hold amplifier's 500 kHz 0.1 dB bandwidth ensures minimal signal degradation even near this limit, making AD7871JP-REEL suitable for audio-band and low-IF sampling applications.
Does the AD7871JP-REEL require an external clock to operate?
No, the AD7871JP-REEL does not require an external clock. It features a self-contained, laser-trimmed internal oscillator nominally set to 2 MHz, which is enabled by tying the CLK pin to VSS. An external TTL-compatible clock may be applied to CLK for synchronization, but it is optional - the internal clock eliminates timing component dependencies and simplifies system design for AD7871JP-REEL.
How is the 14-bit output format selected on the AD7871JP-REEL?
The 14-bit parallel output format on AD7871JP-REEL is selected by applying +5 V to the 14/8/CLK pin (Pin 28). When this pin is high, DB13–DB0 become active three-state outputs delivering the full 14-bit word simultaneously. This configuration disables byte and serial modes, making AD7871JP-REEL behave as a dedicated 14-bit parallel ADC with minimal interface overhead.
What is the purpose of the CREF pin on the AD7871JP-REEL?
The CREF pin (Pin 23) on AD7871JP-REEL is the decoupling node for the internal 3 V buried Zener reference. A 10 nF capacitor must be connected between CREF and AGND to suppress reference noise and ensure stable operation. This capacitor is mandatory per the datasheet - omitting it degrades SNR and increases INL, directly impacting AD7871JP-REEL's dynamic and dc accuracy specifications.
Can the AD7871JP-REEL interface directly with an 8-bit microprocessor bus?
Yes, the AD7871JP-REEL supports direct 8-bit bus interfacing via its byte-mode output. When the 14/8/CLK pin is set to 0 V, the DB13/HBEN pin becomes HBEN (high-byte enable), allowing sequential reading of upper and lower bytes using the same 8-bit data lines. This eliminates external latches or multiplexers, enabling seamless integration with legacy 8-bit processors such as the 8051 or Z80 in AD7871JP-REEL-based data acquisition systems.
AD7871JP-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 83k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel, Serial
- Configuration:
- ADC
- Ratio - S/H:ADC:
- 0:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- ±5V
- Voltage - Supply, Digital:
- ±5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PLCC (11.51x11.51)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7871JP-REEL FAQ
1.How can I place an order for AD7871JP-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7871JP-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 AD7871JP-REEL reliable?
The price and inventory of AD7871JP-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7871JP-REEL is usually 5 days.
3.What payment methods are accepted for AD7871JP-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7871JP-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7871JP-REEL?
AD7871JP-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7871JP-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 AD7871JP-REEL?
For technical support, including AD7871JP-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7871JP-REEL requirements.
6.How does Aetrix verify that AD7871JP-REEL is sourced from the original manufacturer or authorized distributors?
All AD7871JP-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 AD7871JP-REEL meets industry standards.
7.What is the process for return or replacement of AD7871JP-REEL?
All AD7871JP-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7871JP-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 AD7871JP-REEL part is unused and in its original packaging.
Return procedure for AD7871JP-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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