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Analog Devices Inc. AD7871JPZ
- Part No.:
- AD7871JPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
AD7871JPZ.pdf
- Description:
- IC ADC 14BIT SAR 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,113
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Product details
Overview
AD7871JPZ from Analog Devices is a complete monolithic 14-bit LC2MOS successive approximation ADC with integrated track-and-hold amplifier, 3 V buried Zener reference, and versatile parallel/byte/serial interface. 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 sampling timing.
For engineers reviewing the AD7871JPZ datasheet, AD7871JPZ pinout, AD7871JPZ application, or AD7871JPZ equivalent, key selection considerations include its three configurable output formats (14-bit parallel, dual-byte, or serial), internal 2 MHz laser-trimmed clock, ±1 LSB integral nonlinearity, and 2 μs track/hold acquisition time - all critical for real-time signal capture in embedded DSP and telecom front-ends.
Technical Context
The AD7871JPZ implements a self-contained SAR architecture with on-chip 3 V temperature-compensated Zener reference and high-speed comparator. Its track-and-hold amplifier achieves 14-bit settling in under 2 μs and supports full-power input signals up to 41.5 kHz.
It features dual-mode operation: Mode 1 uses CONVST for precise external sampling control (jitter-critical applications), while Mode 2 initiates conversion via CS/RD handshake (microprocessor-centric systems). The 14/8/CLK pin selects between 14-bit parallel, byte-oriented, or serial output formats - enabling direct interfacing to 8-bit, 16-bit, or serial controllers without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit monotonic with no missing codes guaranteed - ensures unambiguous digital representation of analog signals across full scale. |
| Throughput Rate | 83 kSPS maximum - supports real-time acquisition of audio-band and baseband communication signals. |
| SNR @ 10 kHz | 80 dB minimum - enables clean digitization of high-fidelity signals in spectrum analysis and speech synthesis. |
| Data Access Time | 57 ns maximum after RD - allows direct connection to fast microprocessors (e.g., ADSP-21xx) without wait states. |
| Power Dissipation | 50 mW typical at ±5 V - suitable for power-constrained DSP modules and portable instrumentation. |
| Analog Input Range | ±3 V bipolar - matches standard op-amp output swing and simplifies anti-aliasing filter design. |
| Reference Output | 3.00 V ±10 mV, 500 μA load capability - provides stable, factory-trimmed reference for external circuitry or ratiometric sensing. |
Pinout & Package
AD7871JPZ is housed in a 28-pin plastic DIP (PDIP) package with 0.6-inch width and through-hole mounting. Pin functions are validated per Analog Devices Rev. F datasheet Figures 5 and Table 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST (Pin 1) | Asynchronous convert start trigger | Rising edge forces track-to-hold transition - enables jitter-free sampling synchronized to external timer or PLL. |
| CS (Pin 2) & RD (Pin 3) | Parallel bus enable/control | Active-low combination enables three-state DB0–DB13 outputs - compatible with 8086/80C196 and ADSP-21xx memory-mapped interfaces. |
| BUSY/INT (Pin 4) | Status indicator / interrupt output | Active-low open-drain signal indicates conversion in progress or completion - usable as CPU wait-state or IRQ source. |
| CLK (Pin 5) | External clock input / oscillator enable | TTL-compatible input; tie to VSS to activate internal 2 MHz laser-trimmed oscillator - eliminates external timing components. |
| 14/8/CLK (Pin 28) | Output format selector | +5 V = 14-bit parallel only; 0 V = byte + serial; −5 V = byte + continuous serial clock - configures interface without firmware changes. |
| VIN (Pin 26) | Analog signal input | ±3 V differential input referenced to AGND - accepts direct connection from instrumentation amps or transformer-coupled sources. |
| REFOUT (Pin 25) | Internal reference output | Stable 3.00 V supply for external DACs, sensors, or bias networks - requires ≤50 pF capacitive load for stability. |
| AGND (Pin 22) & DGND (Pin 14) | Separate analog/digital ground returns | Isolates noise-sensitive analog core from digital switching transients - mandates star grounding at single-point decoupling capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Complete monolithic ADC | Integrates track-and-hold, 14-bit SAR, 3 V Zener reference, and interface logic - eliminates 12+ external components in data acquisition designs. |
| Three configurable output formats | Single 14-bit word, two 8-bit bytes, or 14-bit serial stream - enables reuse across 8-bit microcontrollers, 16-bit DSPs, and low-pin-count FPGA interfaces. |
| Internal laser-trimmed 2 MHz clock | Self-contained timing with <±50 ppm accuracy - removes crystal oscillator, capacitors, and layout sensitivity from BOM and PCB. |
| 80 dB SNR at 10 kHz | Validated dynamic performance including THD (−86 dB max) and IMD - meets requirements for voiceband modems and spectral purity-critical measurement tools. |
| Bipolar ±3 V input range | Matched to standard op-amp rails and AC-coupled signal chains - avoids level-shifting circuitry and preserves DC coupling capability. |
Applications
| Digital Signal Processing | High-Speed Modems |
|---|---|
|
Use Scenario: Real-time acquisition of I/Q baseband signals in software-defined radio receivers. IC Role / Device Role / Timing Role: ADC front-end capturing 83 kSPS complex samples with precise CONVST-triggered sampling to minimize aperture jitter. Use Value: 80 dB SNR and ±1 LSB INL preserve modulation accuracy for QAM-64 and higher-order schemes without post-processing correction. |
Use Scenario: Analog front-end in V.34/V.90 telephone-line modems converting line signals for DSP-based symbol decoding. IC Role / Device Role / Timing Role: High-fidelity digitizer interfaced via byte mode to 8-bit microcontroller for cost-optimized modem IC integration. Use Value: Dual-byte output format and 57 ns access time enable zero-wait-state transfers to 8051-class processors, reducing system latency. |
| Spectrum Analysis | DSP Servo Control |
|
Use Scenario: Input stage of portable FFT-based spectrum analyzers measuring harmonic distortion in power electronics. IC Role / Device Role / Timing Role: Precision ADC providing calibrated amplitude data with on-chip 3 V reference ensuring measurement repeatability across units. Use Value: 2 μs track/hold acquisition and 41.5 kHz full-power bandwidth support accurate capture of transient harmonics up to 20 kHz. |
Use Scenario: Position feedback digitization in industrial motor drives using resolver or LVDT sensors. IC Role / Device Role / Timing Role: Bipolar-input ADC accepting ±3 V differential outputs from precision instrumentation amps driving closed-loop PID computation. Use Value: ±12 LSB gain error spec and twos-complement coding simplify signed arithmetic in real-time DSP servo algorithms. |
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 | Serial-only output, 16-pin PDIP/SOIC, no parallel interface - lacks byte/14-bit parallel modes and HBEN/SSTRB flexibility. | Best suited for space-constrained, serial-interface-only systems where pin count is critical and parallel bus not required. | Select AD7872JPZ only when serial interface suffices and board area savings outweigh loss of parallel configurability. |
| ADS8320U | 16-bit resolution, SPI interface only, 100 kSPS, external reference required - higher resolution but no internal reference or bipolar input support. | Preferred for high-accuracy measurement systems needing >14-bit precision, where external reference and SPI compatibility exist. | Choose ADS8320U when resolution >14 bits is mandatory and system already provides precision external reference and SPI infrastructure. |
Compared with AD7871JPZ, AD7872JPZ reduces pin count and interface flexibility but saves board space, while ADS8320U trades internal reference and bipolar input for higher resolution and SPI simplicity - making AD7871JPZ optimal for mixed-protocol, resource-constrained DSP front-ends requiring configurability and self-containment.
Availability
AD7871JPZ 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 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 AD7871JPZ belongs to Analog Devices' legacy high-speed precision ADC product line, designed specifically for real-time data acquisition in DSP, telecom, and instrumentation systems demanding integrated reference, low jitter, and multi-format interface flexibility.
FAQ
What is the operating temperature range for the AD7871JPZ?
The AD7871JPZ J-version is rated for 0°C to +70°C commercial operation. This range is confirmed in the Absolute Maximum Ratings table (Page 6) and Specifications table (Page 3) of the Rev. F datasheet, where J/K versions share identical thermal limits. Operation outside this range may cause parametric shift or functional failure.
Does the AD7871JPZ require an external clock to operate?
No, the AD7871JPZ does not require an external clock. Its internal laser-trimmed oscillator provides a nominal 2 MHz clock when CLK (Pin 5) is tied to VSS. External clocking is optional and supported via TTL-compatible input on the same pin - enabling synchronization to system clocks when lowest jitter is critical.
How is the reference voltage generated and used in the AD7871JPZ?
The AD7871JPZ integrates a factory-trimmed 3 V buried Zener reference, accessible at REFOUT (Pin 25) and internally used for DAC scaling and bipolar offset. It delivers up to 500 μA with ±10 mV tolerance at +25°C and ±40 ppm/°C tempco. CREF (Pin 23) must be decoupled to AGND with a 10 nF capacitor for noise suppression.
What are the supported digital output formats of the AD7871JPZ?
The AD7871JPZ supports three output formats selected by the 14/8/CLK pin (Pin 28): 14-bit parallel (DB0–DB13), dual-byte (HBEN-controlled upper/lower byte), and 14-bit serial (SDATA/SCLK/SSTRB). Each mode is electrically verified in the Functional Block Diagram (Figure 1) and Pin Function Descriptions (Table 4).
Can the AD7871JPZ interface directly with an 8-bit microcontroller?
Yes, the AD7871JPZ can interface directly with an 8-bit microcontroller using its byte-mode output. With 14/8/CLK at 0 V and HBEN (Pin 6) toggled, DB0–DB7 deliver alternating upper and lower bytes of the 14-bit result - eliminating need for external latches or glue logic in 8051 or PIC-based systems.
AD7871JPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for AD7871JPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7871JPZ 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 reliable?
The price and inventory of AD7871JPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7871JPZ is usually 5 days.
3.What payment methods are accepted for AD7871JPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7871JPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7871JPZ?
AD7871JPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7871JPZ 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?
For technical support, including AD7871JPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7871JPZ requirements.
6.How does Aetrix verify that AD7871JPZ is sourced from the original manufacturer or authorized distributors?
All AD7871JPZ 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 meets industry standards.
7.What is the process for return or replacement of AD7871JPZ?
All AD7871JPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7871JPZ, 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 part is unused and in its original packaging.
Return procedure for AD7871JPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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