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Analog Devices Inc. AD7871KP-REEL
- Part No.:
- AD7871KP-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
AD7871KP-REEL.pdf
- Description:
- 14-BIT SAR ADC
- Quantity:
- Payment:
- Shipping:
Inventory:2,400
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Product details
Overview
AD7871KP-REEL from Analog Devices is a complete monolithic 14-bit successive-approximation analog-to-digital converter with integrated track/hold amplifier, 3 V buried Zener reference, and self-contained laser-trimmed internal clock. It delivers 83 kSPS throughput, 80 dB SNR at 10 kHz, ±1 LSB integral nonlinearity, and supports bipolar ±3 V analog input. It is used in high-speed DSP servo control and spectrum analysis systems requiring precise sampling timing.
For engineers reviewing the AD7871KP-REEL datasheet, AD7871KP-REEL pinout, AD7871KP-REEL application, or AD7871KP-REEL equivalent, key selection considerations include its 28-pin PLCC package, three configurable data output formats (14-bit parallel, byte, or serial), ±5 V dual supply operation, and support for Mode 1 (CONVST-triggered) and Mode 2 (CS-triggered) interface protocols.
Technical Context
The AD7871KP-REEL implements a full LC2MOS-based ADC subsystem: a high-speed track/hold amplifier with <2 µs acquisition time, a 14-bit SAR core with 2's complement coding, and an on-chip 3 V temperature-compensated buried Zener reference trimmed to ±10 mV. Its internal 2 MHz clock eliminates external timing components, though it accepts external TTL clocks via CLK pin.
It supports three digital interface modes controlled by the 14/8/CLK pin: 14-bit parallel (pin = +5 V), or dual-mode byte/serial (pin = 0 V or –5 V). In byte mode, HBEN selects upper/lower byte; in serial mode, DB12/SSTRB, DB11/SCLK, and DB10/SDATA become open-drain outputs requiring external pull-ups, with data valid on SCLK falling edge while SSTRB is low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees no missing codes; LSB = 366 µV for ±3 V input range |
| Throughput Rate | 83 kSPS - determined by 10.5 µs max conversion time + <2 µs track/hold acquisition |
| SNR | 80 dB min at 10 kHz - enables high-fidelity digitization of audio and IF signals |
| INL | ±1 LSB max - ensures monotonicity and linearity critical for closed-loop control |
| Analog Input Range | ±3 V bipolar - compatible with standard op-amp signal chains without level-shifting |
| Reference Output | 3.00 V ±10 mV - internally trimmed, supports 500 µA external load; requires 10 nF CREF decoupling |
| Power Dissipation | 50 mW typ - achieved with ±5 V supplies and internal clock; IDD = 6 mA, ISS = 4 mA |
| Data Access Time | 57 ns - enables direct interfacing with fast microprocessors and DSPs without wait states |
Pinout & Package
AD7871KP-REEL is housed in a 28-lead plastic leaded chip carrier (PLCC) package with J-lead geometry, lead pitch of 0.05 inches, and body size 0.490 × 0.490 inches. It is RoHS-compliant and rated for industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Asynchronous convert start | Rising edge initiates hold mode; required for Mode 1 precise sampling; must be high during CS/RD read |
| CS | Chip select | Active-low enable; in Mode 2, falling edge starts conversion when CONVST = low |
| RD | Read strobe | Active-low; enables three-state data outputs DB13–DB0 when CS is low |
| BUSY/INT | Status output | Open-drain; functions as INT (low pulse at conversion end) in Mode 1, BUSY (low during conversion) in Mode 2 |
| CLK | Clock input | Accepts external TTL clock; tied to VSS to enable internal 2 MHz oscillator |
| 14/8/CLK | Format control | +5 V = 14-bit parallel only; 0 V or –5 V = byte/serial selectable; defines pin multiplexing |
| HBEN | High-byte enable | In byte mode: high = DB7–DB0 = upper 6 bits (right-justified); low = lower 8 bits |
| DB13–DB0 | Data outputs | Three-state, parallel 14-bit bus; function depends on 14/8/CLK and HBEN state |
| VIN | Analog input | ±3 V differential input range referenced to AGND; 15 kΩ typical input resistance |
| REF OUT | Reference output | 3.00 V ±10 mV; capable of sourcing 500 µA; max 50 pF capacitive load recommended |
| CREF | Reference decoupling | Must connect 10 nF capacitor to AGND to minimize reference noise and ensure dc accuracy |
| AGND / DGND | Analog/digital ground | Separate pins required; must be connected at single point to avoid ground loops and noise coupling |
| VDD / VSS | Supply rails | +5 V ±5% and –5 V ±5%; power dissipation 50 mW typical; decoupling caps mandatory |
Key Features
| Feature | Design Value |
|---|---|
| Complete monolithic ADC subsystem | Integrates track/hold, 14-bit SAR, 3 V Zener reference, and internal clock-no external components needed beyond decoupling caps |
| Configurable digital interface | Single pin (14/8/CLK) selects between 14-bit parallel, 8-bit byte, or 16-bit serial (2 leading zeros + 14-bit result) output formats |
| Low-noise, high-SNR performance | 80 dB SNR at 10 kHz and –86 dB THD enable accurate spectral analysis and speech processing without post-processing correction |
| Industrial-grade timing robustness | 57 ns data access time and 10.5 µs max conversion time allow direct connection to 8051, TMS320Cxx, and other legacy high-speed controllers |
| Bipolar/unipolar flexibility | Native ±3 V input supports bipolar signal chains; unipolar operation enabled via REF OUT offset (e.g., 0–5 V or 0–10 V ranges) |
Applications
| Digital Signal Processing | High-Speed Modems |
|---|---|
Use Scenario: Real-time FIR filtering and FFT computation in embedded DSP systems operating at 60–83 kSPS sampling rates. IC Role / Device Role / Timing Role: Primary ADC front-end providing synchronized, low-jitter sample capture with precise CONVST-triggered timing. Use Value: 80 dB SNR and 83 kSPS throughput enable clean 10 kHz bandwidth reconstruction without oversampling or dithering. | Use Scenario: Digitizing baseband analog signals in V.34/V.90 modem receivers before QAM demodulation. IC Role / Device Role / Timing Role: High-linearity ADC capturing I/Q channel signals with minimal harmonic distortion affecting constellation fidelity. Use Value: –86 dB THD and ±1 LSB INL preserve signal integrity across 0–41.5 kHz full-power bandwidth. |
| Spectrum Analysis | DSP Servo Control |
Use Scenario: Portable RF spectrum analyzers performing real-time 1024-point FFTs on captured IF waveforms. IC Role / Device Role / Timing Role: Precision ADC feeding time-domain samples to FPGA-based FFT engines with deterministic latency. Use Value: 2 µs track/hold acquisition and 57 ns data access ensure minimal aperture jitter and consistent sample alignment. | Use Scenario: Closed-loop position/velocity feedback in industrial motion controllers using resolver or encoder analog outputs. IC Role / Device Role / Timing Role: Bipolar ADC digitizing ±3 V error signals from analog integrators in PID compensation loops. Use Value: ±12 LSB zero/gain error spec and stable 3 V reference enable sub-0.1% loop gain accuracy over temperature. |
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 |
|---|---|---|---|
| AD7872KPZ-REEL | Serial-only output; 16-pin SOIC; no 14-bit parallel or byte mode; identical dynamic specs (80 dB SNR, 83 kSPS) | Used where board space is constrained and only serial interface to FPGA or microcontroller is needed | Select AD7872KPZ-REEL if serial-only interface suffices and smaller footprint is prioritized over interface flexibility |
| ADS8325IPFBT | 16-bit resolution; SPI interface only; 100 kSPS; external reference required; no internal track/hold | Targets higher-precision measurement systems where 16-bit resolution outweighs need for integrated T/H and reference | Select ADS8325IPFBT when >14-bit resolution is mandatory and system already provides precision external reference and signal conditioning |
Compared with AD7872KPZ-REEL, AD7871KP-REEL offers broader interface flexibility but larger package; compared with ADS8325IPFBT, it trades resolution for integration, eliminating external reference and track/hold design effort at the cost of 2-bit precision.
Availability
AD7871KP-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 industrial temperature support, and legacy interface compatibility.
Supply support for AD7871KP-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7871KP-REEL belongs to Analog Devices' LC2MOS precision ADC product line, designed specifically for high-speed, low-power, fully integrated data acquisition in DSP, telecom, and instrumentation systems where minimal external components and deterministic timing are essential.
FAQ
What is the operating temperature range for the AD7871KP-REEL?
The AD7871KP-REEL is rated for the industrial temperature range of –40°C to +85°C. This rating is confirmed by the "K" grade designation in the part number and aligns with the specifications table indicating K-version operation across that range. The device uses Analog Devices' LC2MOS process to maintain stability and accuracy across this full industrial span without derating.
Does the AD7871KP-REEL require an external clock to operate?
No, the AD7871KP-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. External clocks are optional and accepted via the CLK pin for synchronization purposes, but the internal clock alone satisfies all timing requirements for 83 kSPS operation.
How is the reference voltage generated and used in the AD7871KP-REEL?
The AD7871KP-REEL integrates a factory-trimmed 3.00 V ±10 mV buried Zener reference. This reference serves dual roles: it sets the DAC full-scale for conversion and provides the dc bias for bipolar operation. The REF OUT pin delivers this voltage and can source up to 500 µA; CREF must be decoupled with a 10 nF capacitor to AGND to meet specified SNR and INL performance.
What are the supported digital interface modes for the AD7871KP-REEL?
The AD7871KP-REEL supports three interface modes selected by the 14/8/CLK pin: (1) 14-bit parallel output (14/8/CLK = +5 V), (2) 8-bit byte output with HBEN-controlled upper/lower byte selection (14/8/CLK = 0 V), and (3) 16-bit serial output (2 leading zeros + 14-bit result) with SSTRB framing and SCLK synchronization (14/8/CLK = 0 V or –5 V).
Can the AD7871KP-REEL perform unipolar analog conversions?
Yes, the AD7871KP-REEL supports unipolar operation. By applying the internal 3 V REF OUT to offset the analog input stage-as shown in Figure 7 of the datasheet-it converts 0–5 V or 0–10 V input ranges. The output remains in 2's complement format and can be converted to straight binary by inverting the MSB, enabling seamless integration into unipolar signal chains without external level-shifting ICs.
AD7871KP-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 83k
- Number of Inputs:
- 14
- Input Type:
- Single Ended
- Data Interface:
- Parallel, Serial
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- ±4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 4.75V ~ 5.25V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PLCC (11.51x11.51)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7871KP-REEL FAQ
1.How can I place an order for AD7871KP-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7871KP-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 AD7871KP-REEL reliable?
The price and inventory of AD7871KP-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7871KP-REEL is usually 5 days.
3.What payment methods are accepted for AD7871KP-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7871KP-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7871KP-REEL?
AD7871KP-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7871KP-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 AD7871KP-REEL?
For technical support, including AD7871KP-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7871KP-REEL requirements.
6.How does Aetrix verify that AD7871KP-REEL is sourced from the original manufacturer or authorized distributors?
All AD7871KP-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 AD7871KP-REEL meets industry standards.
7.What is the process for return or replacement of AD7871KP-REEL?
All AD7871KP-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7871KP-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 AD7871KP-REEL part is unused and in its original packaging.
Return procedure for AD7871KP-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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