My Inquiry
My Account
Analog Devices Inc. AD7871KPZ
- Part No.:
- AD7871KPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
AD7871KPZ.pdf
- Description:
- IC ADC 14BIT SAR 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,017
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7871KPZ 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 internal 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 timing and low-noise conversion.
For engineers reviewing the AD7871KPZ datasheet, AD7871KPZ pinout, AD7871KPZ application, or AD7871KPZ equivalent, key selection considerations include its three configurable output formats (14-bit parallel, byte, or serial), internal clock override capability for system synchronization, ±1 LSB integral nonlinearity, and 2 μs track/hold acquisition time - all critical for real-time signal capture in embedded measurement and communications hardware.
Technical Context
The AD7871KPZ implements a successive approximation register (SAR) architecture with a voltage-output DAC and high-speed comparator, enabling full 14-bit resolution without missing codes. Its on-chip 3 V buried Zener reference provides ±40 ppm/°C tempco and supports up to 500 μA external load via REFOUT.
It features dual interface modes: Mode 1 uses CONVST for precise sample timing (e.g., synchronized to external timer), while Mode 2 initiates conversion via CS/RD handshake for microprocessor-controlled operation. The 14/8/CLK pin selects between 14-bit parallel, 8-bit byte, or serial output - with HBEN enabling upper/lower byte selection during byte mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees no missing codes; ideal for precision measurement where monotonicity and code density are essential. |
| Throughput Rate | 83 kSPS - enables real-time capture of signals up to ~41.5 kHz full-power bandwidth per Nyquist criterion. |
| SNR @ 10 kHz | 80 dB min - ensures clean digitization of audio-band and intermediate-frequency signals in spectrum analyzers. |
| Data Access Time | 57 ns max - allows direct interfacing with fast 8051, ADSP-21xx, or similar microcontrollers without wait states. |
| Power Dissipation | 50 mW typ - supports thermally constrained designs such as portable instrumentation and dense DSP boards. |
| Analog Input Range | ±3 V - compatible with standard op amp output stages and industrial sensor conditioning circuits. |
| Integral Nonlinearity | ±1 LSB max - maintains accuracy across full scale for calibration-critical applications like test equipment. |
Pinout & Package
AD7871KPZ is housed in a 28-pin PLCC (Plastic Leaded Chip Carrier) package with gull-wing leads, rated for 0°C to +70°C (K grade) operation. Pin 1 is marked by a corner notch; pin numbering proceeds counterclockwise.
| 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 clocks or timers. |
| CS (Pin 2) | Chip select enable | Active-low signal that enables data outputs and initiates conversion when CONVST is tied low (Mode 2). |
| RD (Pin 3) | Data read strobe | Active-low control that gates DB0–DB13 outputs; timing-critical for bus interface compliance (t6 = 57 ns max). |
| BUSY/INT (Pin 4) | Status indicator | Open-drain logic-low output during conversion; doubles as interrupt request for microprocessor wait-state management. |
| 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. |
| DB13/HBEN (Pin 6) | MSB data output or high-byte enable | Configurable function: outputs DB13 in 14-bit mode; acts as HBEN control for 8-bit bus byte selection in byte mode. |
| 14/8/CLK (Pin 28) | Output format selector | +5 V → 14-bit parallel only; 0 V → byte + serial with gated SCLK; −5 V → byte + serial with continuous SCLK. |
| VIN (Pin 26) | Analog input | ±3 V differential-capable input with 15 kΩ typical impedance - accepts directly buffered sensor or signal chain outputs. |
| REFOUT (Pin 25) | Reference voltage source | Stable 3.00 V ±10 mV output; supports ≤500 μA load; requires 10 nF CREF-to-AGND decoupling for optimal noise performance. |
| AGND (Pin 22) | Analog ground reference | Separate ground return for analog circuitry - must be isolated from DGND except at single-point star connection to minimize digital noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Complete monolithic ADC | Integrates SAR core, track-and-hold, 3 V Zener reference, and interface logic - eliminates need for external DAC, reference, or timing ICs. |
| Three output formats | 14-bit parallel, two 8-bit bytes, or 14-bit serial - enables flexible integration with 16-bit DSPs, 8-bit MCUs, or FPGA-based serial receivers. |
| Internal clock with override | 2 MHz laser-trimmed oscillator (±1% tolerance); can be disabled to accept external clock - simplifies layout and reduces EMI sources. |
| Low power consumption | 50 mW typical at 83 kSPS - suitable for battery-powered or thermally limited instrumentation without sacrificing speed or resolution. |
| Bipolar/unipolar support | Native ±3 V input with twos-complement coding; unipolar operation enabled via REFOUT offset - accommodates both industrial sensor and audio signal chains. |
Applications
| Digital Signal Processing Systems | High-Speed Modems |
|---|---|
Use Scenario: Real-time FFT-based spectral analysis of RF or audio signals in field-deployable test equipment. IC Role / Device Role / Timing Role: Primary sampling engine performing synchronized, low-jitter acquisition at 83 kSPS with 80 dB SNR fidelity. Use Value: Enables accurate detection of weak harmonics and spurs within 10 kHz bandwidth due to low THD (−86 dB) and stable internal reference. | Use Scenario: Digitizing baseband analog waveforms in V.34/V.90 modem front-ends before digital filtering and demodulation. IC Role / Device Role / Timing Role: High-fidelity analog front-end ADC converting ±3 V line-level signals with minimal quantization noise. Use Value: Delivers 14-bit resolution and 57 ns access time to meet tight symbol timing constraints and maintain BER < 10⁻⁶. |
| Speech Recognition Hardware | DSP Servo Control Loops |
Use Scenario: Capturing microphone preamp outputs in embedded voice command processors for feature extraction and neural inference. IC Role / Device Role / Timing Role: Low-latency sampling node feeding fixed-point DSP cores with deterministic 12 μs max total conversion+acquisition cycle. Use Value: Ensures consistent frame alignment across multi-channel inputs, critical for MFCC computation and speaker-independent modeling. | Use Scenario: Closed-loop position/velocity feedback in industrial motion controllers using resolver or encoder analog outputs. IC Role / Device Role / Timing Role: Precision analog interface converting ±3 V feedback signals into 14-bit digital values for PID computation. Use Value: ±1 LSB INL and 2 μs track/hold acquisition enable sub-micron positioning accuracy and smooth torque response. |
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 | Serial-only output; 16-pin PDIP/SOIC/CERDIP; lacks parallel/byte interface and HBEN pin functionality. | Targeted at space-constrained, serial-interface-only systems - not suitable for 8- or 16-bit parallel bus architectures. | Select AD7872KPZ only if serial interface suffices and PCB area is severely limited; otherwise AD7871KPZ offers greater flexibility. |
| ADS8325IPW | 16-bit, 100 kSPS, SPI interface only; external reference required; consumes 25 mW at 100 kSPS. | Higher resolution but no native parallel interface or internal reference - demands additional support components and layout effort. | Choose ADS8325IPW when 16-bit resolution is mandatory and system already uses SPI; AD7871KPZ remains superior for drop-in replacement in legacy 14-bit parallel designs. |
Compared with AD7872KPZ, AD7871KPZ provides parallel/byte/serial configurability and larger package options; versus ADS8325IPW, it trades 2 extra bits for integrated reference, lower BOM count, and broader interface compatibility - making it optimal for cost-sensitive, mixed-signal embedded systems needing proven 14-bit performance.
Availability
AD7871KPZ is available at Aetrix Electronics and suitable for digital signal processing systems, high-speed modems, and DSP servo control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7871KPZ 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 AD7871KPZ belongs to the AD7871/AD7872 family of complete sampling ADCs designed specifically for demanding real-time signal acquisition in DSP, telecom, and instrumentation applications where integration, speed, and dynamic performance are critical.
FAQ
What is the operating temperature range for the AD7871KPZ?
The AD7871KPZ is specified for commercial-grade operation from 0°C to +70°C. This K-grade version uses the same die as the J-version but undergoes tighter screening; it is packaged in a 28-pin PLCC and shares identical electrical specifications including ±1 LSB integral nonlinearity and 80 dB SNR at 10 kHz. Always verify thermal derating above 70°C per Absolute Maximum Ratings table.
Does the AD7871KPZ require an external clock to operate?
No, the AD7871KPZ does not require an external clock. It contains a self-contained, laser-trimmed internal oscillator nominally set to 2 MHz - sufficient for its 83 kSPS throughput. External clocking is optional via the CLK pin (Pin 5) and is used primarily to synchronize conversion timing with external systems or reduce EMI. Tying CLK to VSS activates the internal clock.
How does the 14/8/CLK pin configure the AD7871KPZ output format?
The 14/8/CLK pin (Pin 28) determines AD7871KPZ output behavior: +5 V selects 14-bit parallel only; 0 V enables both byte and serial outputs with gated SCLK; −5 V enables both byte and serial outputs with continuous SCLK. This pin also controls whether DB13/HBEN (Pin 6) functions as MSB output or high-byte enable - critical for correct 8-bit bus interfacing.
Can the AD7871KPZ interface directly with an 8-bit microcontroller?
Yes, the AD7871KPZ supports direct 8-bit microcontroller interfacing via its byte-mode output. With 14/8/CLK at 0 V or −5 V and HBEN (Pin 6) toggled, DB7–DB0 deliver upper or lower bytes of the 14-bit result. RD and CS coordinate handshaking, while BUSY/INT provides conversion status - eliminating need for external glue logic in MCS-51 or PIC-based designs.
What is the purpose of the CREF pin on the AD7871KPZ?
The CREF pin (Pin 23) is the dedicated decoupling point for the AD7871KPZ's internal 3 V buried Zener reference. A 10 nF capacitor must be placed between CREF and AGND to minimize reference noise and ensure specified dynamic performance (e.g., 80 dB SNR). This capacitor stabilizes the reference during internal switching events and is mandatory for achieving datasheet AC specifications.
AD7871KPZ 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:
- -
AD7871KPZ FAQ
1.How can I place an order for AD7871KPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7871KPZ 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 AD7871KPZ reliable?
The price and inventory of AD7871KPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7871KPZ is usually 5 days.
3.What payment methods are accepted for AD7871KPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7871KPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7871KPZ?
AD7871KPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7871KPZ 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 AD7871KPZ?
For technical support, including AD7871KPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7871KPZ requirements.
6.How does Aetrix verify that AD7871KPZ is sourced from the original manufacturer or authorized distributors?
All AD7871KPZ 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 AD7871KPZ meets industry standards.
7.What is the process for return or replacement of AD7871KPZ?
All AD7871KPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7871KPZ, 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 AD7871KPZ part is unused and in its original packaging.
Return procedure for AD7871KPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7871KPZ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
