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Analog Devices Inc. AD7871JPZ-REEL
- Part No.:
- AD7871JPZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
AD7871JPZ-REEL.pdf
- Description:
- IC ADC 14BIT SAR 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,078
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Product details
Overview
AD7871JPZ-REEL from Analog Devices is a complete monolithic 14-bit LC2MOS successive approximation ADC with integrated 3 V buried Zener reference, track-and-hold amplifier, and configurable parallel/byte/serial interface. It delivers 80 dB SNR at 10 kHz, 57 ns data access time, and 83 kSPS throughput while operating 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 sampling timing.
For engineers reviewing the AD7871JPZ-REEL datasheet, AD7871JPZ-REEL pinout, AD7871JPZ-REEL application, or AD7871JPZ-REEL equivalent, key selection considerations include its dual-mode interface (14-bit parallel, byte, or serial), internal 2 MHz laser-trimmed clock, ±1 LSB integral nonlinearity, 2 μs track/hold acquisition time, and J-grade temperature range (0°C to +70°C) in 28-pin PLCC package.
Technical Context
The AD7871JPZ-REEL implements a self-contained SAR architecture with on-chip 3 V temperature-compensated Zener reference and fast track-and-hold amplifier-acquiring to 14-bit accuracy in ≤2 μs. Its conversion core uses a voltage-output DAC and high-speed comparator, eliminating external timing components.
Interface flexibility is achieved via the 14/8/CLK pin, enabling three output formats: full 14-bit parallel (DB13–DB0), two 8-bit bytes (with HBEN-controlled byte selection), or 14-bit serial stream (SSTRB/SCLK/SDATA). The BUSY/INT output provides asynchronous conversion status signaling for microprocessor wait-state integration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit-guarantees no missing codes; supports 16384 discrete levels over ±3 V input range. |
| SNR @ 10 kHz | 80 dB min-enables high-fidelity digitization of audio and IF signals in DSP and modem applications. |
| Throughput Rate | 83 kSPS-supports real-time sampling of signals up to 41.5 kHz (Nyquist-limited). |
| Data Access Time | 57 ns max-allows direct interfacing to fast 8086/80C196 or SHARC DSP buses without wait states. |
| Power Dissipation | 50 mW typ (±5 V supplies)-reduces thermal load in dense mixed-signal PCB layouts. |
| Integral Nonlinearity | ±1 LSB max-ensures accurate amplitude representation critical for closed-loop servo feedback. |
| Analog Input Range | ±3 V bipolar-directly accepts differential sensor outputs or op-amp conditioned signals without level-shifting. |
Pinout & Package
AD7871JPZ-REEL is housed in a 28-lead plastic leaded chip carrier (PLCC) package with gull-wing leads, RoHS-compliant and moisture-sensitive level 3. Pin 1 is marked by a corner notch; pins are numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST (Pin 1) | Asynchronous convert start | Rising edge initiates hold mode; enables precise jitter-free sampling synchronized to external timer. |
| CS (Pin 2) | Chip select | Active-low enables data bus drivers; when CONVST = low, CS falling edge triggers conversion (Mode 2). |
| RD (Pin 3) | Read strobe | Active-low enables DB13–DB0 outputs; controls data valid window timing per Mode 1/2 timing diagrams. |
| BUSY/INT (Pin 4) | Status output | Open-drain active-low indicates conversion in progress; doubles as interrupt for CPU wait-state control. |
| CLK (Pin 5) | Clock input | TTL-compatible; tie to VSS to enable internal 2 MHz oscillator-no external crystal or RC network needed. |
| DB13/HBEN (Pin 6) | Configurable I/O | DB13 output in 14-bit mode; HBEN control input in byte mode-selects upper/lower byte on DB7–DB0. |
| 14/8/CLK (Pin 28) | Interface mode selector | +5 V = 14-bit parallel only; 0 V = byte + serial (gated SCLK); −5 V = byte + serial (continuous SCLK). |
| VIN (Pin 26) | Analog input | ±3 V differential input referenced to AGND; 15 kΩ input impedance-compatible with op-amp drivers. |
| REFOUT (Pin 25) | Reference output | 3.00 V ±10 mV, 500 μA drive capability-usable as system reference for external circuitry or DACs. |
| CREF (Pin 23) | Reference decoupling | Connect 10 nF capacitor to AGND-critical for minimizing reference noise and maintaining 80 dB SNR. |
Key Features
| Feature | Design Value |
|---|---|
| Complete monolithic ADC | Integrates SAR core, track-and-hold, 3 V Zener reference, and interface logic-eliminates 12+ external components. |
| Three configurable output formats | Supports 16-bit microprocessors (14-bit parallel), 8-bit MCUs (byte mode), and space-constrained designs (serial). |
| Internal laser-trimmed clock | 2 MHz oscillator trimmed at wafer test-removes clock generator BOM cost and layout sensitivity to EMI. |
| Low power at high speed | 50 mW typical dissipation at 83 kSPS-enables battery-backed portable spectrum analyzers and modems. |
| Bipolar/unipolar operation | Hardware-configurable via external resistors-supports ±3 V sensors or 0–5 V industrial transducers without redesign. |
Applications
| Digital Signal Processing | High-Speed Modems |
|---|---|
|
Use Scenario: Real-time FFT-based spectral monitoring in telecom baseband processing units. IC Role / Device Role / Timing Role: Primary sampling front-end ADC synchronizing to FPGA-controlled CONVST for deterministic latency. Use Value: 80 dB SNR and ±1 LSB INL preserve signal integrity across 0–41.5 kHz bandwidth, enabling 12-bit effective resolution in noise-floor-limited channels. |
Use Scenario: Analog front-end in V.34/V.90 telephone line modems performing echo cancellation and adaptive equalization. IC Role / Device Role / Timing Role: Bipolar-input ADC capturing 3.4 kHz POTS band with precise timing controlled by DSP-generated CONVST pulses. Use Value: 2 μs track/hold acquisition ensures <0.01% aperture error at 83 kSPS, critical for maintaining QAM constellation fidelity. |
| Spectrum Analysis | DSP Servo Control |
|
Use Scenario: Portable handheld spectrum analyzer measuring RF interference in EMC pre-compliance testing. IC Role / Device Role / Timing Role: High-dynamic-range digitizer feeding 1024-point FFT engine; REFOUT supplies reference to external anti-alias filter op-amps. Use Value: On-chip 3 V reference with ±40 ppm/°C tempco eliminates drift-induced baseline shift during field operation across 0–70°C. |
Use Scenario: Position feedback loop in industrial CNC motion controller using resolver-to-digital conversion. IC Role / Device Role / Timing Role: Precision ADC digitizing filtered resolver sine/cosine outputs; BUSY/INT drives DSP wait state for deterministic loop timing. Use Value: 57 ns data access time allows single-cycle read in SHARC ADSP-2106x, reducing servo loop latency to <1 μs. |
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 |
|---|---|---|---|
| AD7872JPZ-REEL | Serial-only output; 16-pin PDIP/SOIC; no parallel/byte interface; same core ADC, reference, and timing specs. | Used where board space is constrained and microcontroller has dedicated SPI peripheral-no 8/16-bit bus required. | Select when serial interface suffices and footprint reduction outweighs flexibility loss; not pin-compatible. |
| ADS8320U | 16-bit, 100 kSPS, SPI interface only; external reference required; 3.3 V supply; no internal track-and-hold. | Targeted at low-power portable instrumentation with higher resolution needs but lower dynamic performance (76 dB SNR). | Choose for resolution-critical DC-coupled measurements; AD7871JPZ-REEL preferred for AC-coupled, high-SNR, ±5 V systems. |
Compared with AD7872JPZ-REEL, AD7871JPZ-REEL offers interface versatility at the cost of larger package; versus ADS8320U, it trades resolution for superior SNR, integrated reference, and bipolar input support-making it optimal for legacy ±5 V DSP systems demanding robust AC performance.
Availability
AD7871JPZ-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 AD7871JPZ-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, with design centers worldwide.
The AD7871JPZ-REEL belongs to Analog Devices' precision data acquisition product line, engineered for applications demanding high-speed, high-dynamic-range digitization in industrial, communications, and test equipment environments.
FAQ
What is the operating temperature range for AD7871JPZ-REEL?
The AD7871JPZ-REEL is rated for the commercial temperature range of 0°C to +70°C, as indicated by the 'J' grade suffix. This specification is guaranteed per the Rev. F datasheet, with dc accuracy and dynamic performance (including 80 dB SNR) validated across this full range under specified supply and load conditions.
Does AD7871JPZ-REEL require an external clock source?
No, AD7871JPZ-REEL does not require an external clock source. Its internal laser-trimmed oscillator operates at 2 MHz nominal when CLK (Pin 5) is tied to VSS. External clocks are optional and accepted via the CLK pin, but the internal clock eliminates timing component BOM and layout complexity for most applications.
How is the analog input configured for unipolar operation with AD7871JPZ-REEL?
Unipolar operation is achieved by offsetting VIN with AD7871JPZ-REEL's internal REFOUT (3.00 V) using an external resistor network (e.g., R3/R4 per Figure 14). This shifts the ±3 V bipolar range to 0–6 V; further scaling yields standard ranges like 0–5 V. The output code remains twos-complement and requires MSB inversion for straight binary.
What is the purpose of the CREF pin on AD7871JPZ-REEL?
The CREF pin on AD7871JPZ-REEL is the decoupling node for the internal buried Zener reference. A 10 nF capacitor must be connected between CREF and AGND to suppress reference noise and ensure specified dynamic performance-including the guaranteed 80 dB SNR. Omitting this capacitor degrades SNR by >10 dB.
Can AD7871JPZ-REEL interface directly to an 8-bit microcontroller bus?
Yes, AD7871JPZ-REEL supports direct 8-bit bus interfacing via its byte-mode output. With 14/8/CLK set to 0 V and HBEN (Pin 6) toggled, DB7–DB0 deliver upper or lower bytes of the 14-bit result. This eliminates need for external latches or glue logic when connecting to legacy 8051 or PIC microcontrollers.
AD7871JPZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 83k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI, Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- 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:
- -
AD7871JPZ-REEL FAQ
1.How can I place an order for AD7871JPZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7871JPZ-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 AD7871JPZ-REEL reliable?
The price and inventory of AD7871JPZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7871JPZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7871JPZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7871JPZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7871JPZ-REEL?
AD7871JPZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7871JPZ-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 AD7871JPZ-REEL?
For technical support, including AD7871JPZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7871JPZ-REEL requirements.
6.How does Aetrix verify that AD7871JPZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7871JPZ-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 AD7871JPZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7871JPZ-REEL?
All AD7871JPZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7871JPZ-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 AD7871JPZ-REEL part is unused and in its original packaging.
Return procedure for AD7871JPZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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