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Analog Devices Inc. AD7872KRZ-REEL
- Part No.:
- AD7872KRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7872KRZ-REEL.pdf
- Description:
- IC ADC 14BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,715
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Product details
Overview
AD7872KRZ-REEL from Analog Devices is a complete monolithic 14-bit successive approximation analog-to-digital converter (ADC) with integrated track-and-hold amplifier, 3 V buried Zener reference, and serial-only digital interface. It operates from ±5 V supplies, accepts bipolar ±3 V analog inputs, delivers 83 kSPS throughput, achieves 80 dB SNR at 10 kHz, and features 57 ns data access time. It is used in high-speed DSP servo control and spectrum analysis systems requiring precise timing and low-noise conversion.
For engineers reviewing the AD7872KRZ-REEL datasheet, AD7872KRZ-REEL pinout, AD7872KRZ-REEL application, or AD7872KRZ-REEL equivalent, key selection considerations include its serial-only output architecture, ±5 V dual-supply requirement, 16-pin SOIC package, internal 2 MHz clock option, and bipolar input compatibility - all critical for embedded data acquisition and real-time signal processing designs.
Technical Context
The AD7872KRZ-REEL implements a self-contained LC2MOS SAR architecture with laser-trimmed internal clock and on-chip 3 V temperature-compensated Zener reference. Its track-and-hold acquires to 14-bit accuracy in ≤2 μs, enabling full-scale conversion of 41.5 kHz signals while maintaining 80 dB SNR.
Unlike the parallel/serial-flexible AD7871, the AD7872KRZ-REEL supports serial output only via SDATA, SCLK, and SSTRB pins with open-drain SCLK requiring a 2 kΩ pull-up and active-low SSTRB requiring a 4.7 kΩ pull-up. It lacks byte-mode or parallel bus outputs, and uses CONTROL pin (Pin 1) instead of 14/8/CLK to select continuous vs. gated SCLK operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees no missing codes; supports 16384 distinct digital levels across ±3 V input range. |
| Throughput Rate | 83 kSPS - maximum sustained sampling rate with internal 2 MHz clock; enables real-time capture of signals up to 41.5 kHz. |
| SNR @ 10 kHz | 80 dB min - measured including distortion and noise; ensures high-fidelity digitization for spectral analysis applications. |
| Analog Input Range | ±3 V - bipolar input compatible with differential sensor outputs and op-amp stages without external level-shifting. |
| Reference Output | 3.00 V ±10 mV - internally trimmed buried Zener; supplies stable reference for external circuitry with ≤500 μA load capability. |
| Power Dissipation | 50 mW typ - low power enables use in thermally constrained industrial modules and portable instrumentation. |
| Conversion Time | 10.5 μs max (internal clock) - defines minimum inter-sample interval; supports deterministic timing in servo loop feedback paths. |
Pinout & Package
AD7872KRZ-REEL is housed in a 16-pin SOIC package (width 7.5 mm), RoHS-compliant, with standard JEDEC MS-012AC footprint and moisture sensitivity level MSL-3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CONTROL | Serial Clock Mode Select | 0 V = gated SCLK (stops after transmission); −5 V = continuous SCLK - determines serial protocol timing behavior. |
| 2 CONVST | Convert Start Trigger | Rising-edge asynchronous start signal; initiates track-to-hold transition and begins conversion cycle. |
| 3 CLK | External Clock Input / Oscillator Enable | TTL-compatible input; tie to VSS to enable internal 2 MHz laser-trimmed oscillator - eliminates external timing components. |
| 4 SSTRB | Serial Frame Strobe | Active-low three-state output; provides framing pulse synchronized to 14-bit serial data stream on SDATA. |
| 5 SCLK | Serial Clock Output | Open-drain gated clock derived from ADC clock; requires 2 kΩ pull-up; edges define serial bit timing. |
| 6 SDATA | Serial Data Output | Three-state serial output; valid on falling edge of SCLK when SSTRB is low - delivers LSB-first or MSB-first per configuration. |
| 8 DGND | Digital Ground Reference | Return path for digital logic; must be isolated from AGND except at single-point star ground to minimize noise coupling. |
| 9,16 VDD | Positive Analog Supply | +5 V ±5% supply for analog core; Pins 9 and 16 must be connected externally to ensure current sharing and low-impedance path. |
| 11 CREF | Reference Decoupling Node | Connection point for 10 nF capacitor to AGND - critical for minimizing reference noise and ensuring dc accuracy. |
| 12 AGND | Analog Ground Reference | Return path for analog circuitry; separate from DGND to preserve signal integrity of ±3 V input stage. |
| 13 REFOUT | Internal Reference Output | 3.00 V ±10 mV Zener reference; capable of sourcing ≤500 μA; max 50 pF capacitive load for stability. |
| 14 VIN | Analog Input Terminal | ±3 V full-scale differential input; 15 kΩ typical input resistance; designed for direct connection to precision op-amp buffers. |
| 15 VSS | Negative Analog Supply | −5 V ±5% supply; powers internal comparator, DAC, and track-and-hold - essential for bipolar operation. |
Key Features
| Feature | Design Value |
|---|---|
| Complete Monolithic ADC | Integrates SAR core, track-and-hold, 3 V Zener reference, and serial interface - eliminates need for external reference, clock, or sample-hold ICs. |
| Self-Contained Clock | Internal 2 MHz laser-trimmed oscillator enables standalone operation; external clock override allows system-level synchronization for EMI reduction. |
| Bipolar Input Support | Direct ±3 V input range with twos-complement coding - simplifies interface to transducer amplifiers and eliminates external level-shifting networks. |
| Low Power Operation | 50 mW typical dissipation at 83 kSPS - suitable for battery-backed data loggers and space-constrained industrial controllers. |
| Dynamic Performance Specified | Full AC specs including THD (−88 dB max), IMD, and SNR provided - enables confident use in communication and audio-grade signal chains. |
Applications
| Digital Signal Processing | High-Speed Modems |
|---|---|
Use Scenario: Real-time acquisition of baseband I/Q signals in software-defined radio front-ends operating at intermediate frequencies up to 41.5 kHz. IC Role / Device Role / Timing Role: ADC front-end converting analog IF outputs to 14-bit serial data for FPGA-based demodulation and filtering. Use Value: 80 dB SNR and low THD preserve modulation fidelity; serial interface reduces FPGA pin count and PCB routing complexity. |
Use Scenario: Digitizing analog line signals in V.34/V.90 modem chipsets where compact layout and deterministic sampling jitter are critical. IC Role / Device Role / Timing Role: High-accuracy analog input stage feeding DSP engine; CONVST-triggered sampling ensures precise symbol timing alignment. Use Value: Internal clock eliminates external crystal, reducing BOM cost; ±3 V input matches line driver output swing without attenuation. |
| Spectrum Analysis | DSP Servo Control |
Use Scenario: Embedded FFT-based spectral monitoring in industrial vibration analyzers capturing mechanical resonance signatures from piezoelectric sensors. IC Role / Device Role / Timing Role: High-fidelity digitizer providing time-domain samples to ARM Cortex-M7 running real-time FFT algorithms. Use Value: 83 kSPS throughput supports 40 kHz Nyquist bandwidth; 2 μs track/hold acquisition minimizes aperture uncertainty in narrowband analysis. |
Use Scenario: Closed-loop position feedback in CNC motion controllers using resolver or LVDT analog outputs requiring precise 14-bit resolution. IC Role / Device Role / Timing Role: Analog interface for position transducer signals; serial output interfaces directly to microcontroller SPI peripheral. Use Value: Bipolar ±3 V range matches resolver excitation harmonics; low 50 mW power enables integration into compact motor drive modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit serial-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7872BN | Same die, 16-pin PDIP package; wider operating temperature range (−40°C to +85°C vs. K version's 0°C to +70°C). | Preferred for industrial environments with extended thermal cycling; not suitable for surface-mount automated assembly. | Select AD7872BN if through-hole mounting and extended temp range are required; AD7872KRZ-REEL is optimal for reflow-soldered SOIC layouts. |
| ADS8320U | 16-bit, 100 kSPS, SPI-compatible serial interface; requires external reference and separate power supplies for analog/digital domains. | Higher resolution but increased system complexity; lacks integrated reference and track-and-hold. | Choose ADS8320U only if 16-bit resolution is mandatory and board space permits external reference and decoupling; AD7872KRZ-REEL offers lower total solution cost and smaller footprint. |
Compared with AD7872BN, AD7872KRZ-REEL trades extended temperature range for surface-mount manufacturability and tape-and-reel delivery; compared with ADS8320U, it sacrifices resolution and SPI compatibility for integration simplicity, lower power, and guaranteed 14-bit monotonicity without calibration.
Availability
AD7872KRZ-REEL is available at Aetrix Electronics and suitable for digital signal processing, high-speed modems, and DSP servo control applications requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production batches.
Supply support for AD7872KRZ-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 and ISO 9001-certified manufacturing.
The AD7872KRZ-REEL belongs to Analog Devices' legacy high-speed precision ADC product line, engineered specifically for applications demanding integrated references, low-jitter sampling, and minimal external component count in space-constrained industrial and communications equipment.
FAQ
What is the maximum analog input frequency supported by the AD7872KRZ-REEL?
The AD7872KRZ-REEL can accurately convert full-power analog signals up to 41.5 kHz, as specified in the General Description section of the Rev. F datasheet. This limit arises from its 83 kSPS throughput rate and the Nyquist–Shannon sampling theorem. Performance remains within datasheet AC specifications (e.g., 80 dB SNR) up to this frequency when using the internal 2 MHz clock and proper anti-aliasing filtering.
Does the AD7872KRZ-REEL require an external clock, or does it have an internal oscillator?
The AD7872KRZ-REEL includes a self-contained, laser-trimmed internal 2 MHz oscillator. Tying the CLK pin (Pin 3) to VSS enables this internal clock, eliminating the need for external timing components. An external TTL-compatible clock may also be applied to CLK for system-level synchronization - a key feature for reducing sampling jitter in noise-sensitive applications.
What are the power supply requirements for the AD7872KRZ-REEL?
The AD7872KRZ-REEL requires dual ±5 V supplies: VDD (+5 V) on Pins 9 and 16, and VSS (−5 V) on Pin 15. Both supplies must be regulated within ±5% tolerance. AGND (Pin 12) and DGND (Pin 8) must be connected at a single point to prevent ground loops. Typical total power dissipation is 50 mW, with IDD ≤13 mA and ISS ≤6 mA.
How is the serial data format structured on the AD7872KRZ-REEL?
The AD7872KRZ-REEL outputs a 14-bit serial data stream on SDATA (Pin 6), synchronized to SCLK (Pin 5) and framed by SSTRB (Pin 4). Data is valid on the falling edge of SCLK while SSTRB is low. The CONTROL pin (Pin 1) selects between gated SCLK (0 V) or continuous SCLK (−5 V). No parallel or byte-mode outputs are available - unlike the AD7871, the AD7872KRZ-REEL is serial-only.
Can the AD7872KRZ-REEL operate with unipolar input signals?
Yes - the AD7872KRZ-REEL supports unipolar operation using its internal 3 V REFOUT (Pin 13) to offset the analog input stage. As shown in Figure 14 of the datasheet, connecting REFOUT to the non-inverting input of an external op-amp buffer enables 0 V to +3 V, 0 V to +5 V, or 0 V to +10 V input ranges. The output code remains twos-complement and can be converted to straight binary by inverting the MSB.
AD7872KRZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- 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:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7872KRZ-REEL FAQ
1.How can I place an order for AD7872KRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7872KRZ-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 AD7872KRZ-REEL reliable?
The price and inventory of AD7872KRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7872KRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7872KRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7872KRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7872KRZ-REEL?
AD7872KRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7872KRZ-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 AD7872KRZ-REEL?
For technical support, including AD7872KRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7872KRZ-REEL requirements.
6.How does Aetrix verify that AD7872KRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7872KRZ-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 AD7872KRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7872KRZ-REEL?
All AD7872KRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7872KRZ-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 AD7872KRZ-REEL part is unused and in its original packaging.
Return procedure for AD7872KRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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