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Analog Devices Inc. AD7872JRZ-REEL
- Part No.:
- AD7872JRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7872JRZ-REEL.pdf
- Description:
- IC ADC 14BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,479
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Product details
Overview
AD7872JRZ-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 AD7872JRZ-REEL datasheet, AD7872JRZ-REEL pinout, AD7872JRZ-REEL application, or AD7872JRZ-REEL equivalent, this page provides verified technical context, real-world interface constraints, confirmed dynamic and DC specifications, validated serial timing behavior, and application-specific design meaning for embedded signal acquisition.
Technical Context
The AD7872JRZ-REEL implements a self-contained LC2MOS SAR architecture with an internal laser-trimmed 2 MHz clock, eliminating external timing components. Its serial interface uses three dedicated pins-SSTRB (active-low framing strobe), SCLK (gated open-drain clock), and SDATA (three-state serial output)-with data valid on the falling edge of SCLK when SSTRB is low.
It supports only Mode 1 operation: conversion is initiated by a rising edge on CONVST, and the track-and-hold transitions to hold mode asynchronously to CLK. The internal 3 V reference is buffered at REFOUT (±40 ppm/°C tempco, 500 μA load capability) and decoupled via CREF to AGND with a 10 nF capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit monotonic, no missing codes guaranteed - ensures full-scale linearity for precision measurement systems. |
| Throughput Rate | 83 kSPS - enables real-time capture of signals up to 41.5 kHz (Nyquist-limited) without aliasing. |
| SNR @ 10 kHz | 80 dB min - supports high-fidelity digitization in speech synthesis and digital signal processing applications. |
| Input Range | ±3 V bipolar - directly interfaces with industrial sensor outputs and op-amp stages without level-shifting. |
| Reference Output | 3.00 V ±10 mV, ±40 ppm/°C - stable internal reference eliminates need for external voltage reference ICs. |
| Power Dissipation | 50 mW typical - suitable for thermally constrained embedded designs with limited heatsinking. |
| Conversion Time | 10.5 μs max (internal clock) - defines minimum inter-sample interval and system latency budget. |
Pinout & Package
AD7872JRZ-REEL is housed in a 16-pin SOIC package (width 3.9 mm, body height 1.75 mm), RoHS-compliant and tape-and-reel packaged per JEDEC standard MS-012AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CONTROL | SCLK gating control | Determines serial clock continuity: −5 V enables continuous SCLK; 0 V gates SCLK after transmission - critical for synchronous host timing. |
| 2 CONVST | Asynchronous conversion trigger | Rising-edge initiates track-to-hold transition - enables jitter-free sampling synchronized to external timers or PLLs. |
| 3 CLK | External clock input / oscillator enable | Tied to VSS to activate internal 2 MHz clock; accepts TTL-level external clock for system synchronization. |
| 4 SSTRB | Serial frame strobe | Active-low open-drain output requiring 4.7 kΩ pull-up - defines 14-bit serial word boundary for host controller framing logic. |
| 5 SCLK | Gated serial clock | Open-drain output requiring 2 kΩ pull-up - clock edges drive serial bit transfer; gated off post-transmission unless CONTROL = −5 V. |
| 6 SDATA | Serial data output | Three-state output valid on SCLK falling edge when SSTRB low - requires host to sample on precise clock edge for reliable bit recovery. |
| 8 DGND | Digital ground return | Separate ground node from AGND - mandates split-plane PCB layout to prevent digital noise coupling into analog path. |
| 9 & 16 VDD | +5 V analog supply | Dual VDD pins (9 and 16) must be shorted externally - ensures low-impedance power delivery to analog core and reference circuitry. |
| 11 CREF | Reference decoupling node | Connect 10 nF capacitor to AGND - suppresses internal reference noise and prevents conversion errors from supply transients. |
| 12 AGND | Analog ground reference | Independent ground for track-and-hold, SAR, and reference - must be star-connected to minimize ground bounce. |
| 13 REFOUT | 3 V reference output | Provides buffered 3.00 V reference for external circuitry; max 500 μA load - usable as precision bias source for front-end amplifiers. |
| 14 VIN | Analog input | ±3 V differential-capable input with 15 kΩ input resistance - accepts direct connection to instrumentation amplifiers or transformer-coupled sources. |
| 15 VSS | −5 V analog supply | Negative rail for bipolar operation - must be decoupled with ≥1 μF ceramic capacitor near pin to maintain PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Complete monolithic ADC | Integrates track-and-hold, 14-bit SAR, 3 V Zener reference, and serial interface - eliminates 7+ external components vs. discrete ADC + reference + driver solutions. |
| Self-contained internal clock | Laser-trimmed 2 MHz oscillator - removes clock generator IC, layout-sensitive traces, and jitter-inducing external crystal circuits. |
| Low-power operation | 50 mW typical at 83 kSPS - reduces thermal load in dense PCB layouts and extends battery life in portable test equipment. |
| Bipolar ±3 V input range | Direct interface to industrial sensors and audio line drivers - avoids external level-shifting resistors and associated gain/offset errors. |
| 80 dB SNR at 10 kHz | Enables 13.6 effective bits (ENOB) - meets dynamic range requirements for voiceband modems and vibration analysis systems. |
Applications
| Digital Signal Processing (DSP) | High-Speed Modems |
|---|---|
Use Scenario: Real-time FFT-based spectral monitoring in field-deployable spectrum analyzers. IC Role / Device Role / Timing Role: ADC front-end capturing baseband I/Q signals at 83 kSPS with deterministic CONVST-triggered sampling. Use Value: 80 dB SNR preserves signal integrity across 0–41.5 kHz bandwidth; internal reference stability minimizes calibration drift over temperature. | Use Scenario: Full-duplex voiceband data transmission in V.34/V.90 modem line cards. IC Role / Device Role / Timing Role: Digitizing analog telephone line signals with precise timing alignment to symbol clock via CONVST synchronization. Use Value: 57 ns serial data access enables tight timing margins for 33.6 kbps symbol decoding; ±3 V input accommodates line voltage variations. |
| Speech Recognition Systems | DSP Servo Control |
Use Scenario: Edge-node voice command acquisition in industrial HMI devices with local keyword spotting. IC Role / Device Role / Timing Role: High-fidelity analog front-end converting microphone preamp output with minimal added noise. Use Value: 80 dB SNR exceeds 12-bit ENOB requirement for MFCC feature extraction; low 50 mW power supports fanless enclosure design. | Use Scenario: Closed-loop position feedback in CNC machine tool motor drives using resolver or LVDT sensors. IC Role / Device Role / Timing Role: Precision digitization of analog error signals for real-time PID computation in DSP-based motion controllers. Use Value: 14-bit resolution resolves sub-micron positioning errors; bipolar input directly accepts differential resolver outputs without signal conditioning. |
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 |
|---|---|---|---|
| AD7872BRZ | Same die, extended temperature grade (−55°C to +125°C); higher INL (±2 LSB max) and lower SNR (77 dB min). | Used in aerospace/defense avionics where wide temperature operation outweighs SNR loss. | Select AD7872BRZ only if operating beyond 0°C–70°C; AD7872JRZ-REEL offers superior SNR and lower INL in commercial environments. |
| ADS8320UB | 16-bit SAR ADC, SPI interface, 100 kSPS, external reference required, no internal track-and-hold. | Applied in high-precision data loggers needing >14-bit resolution but accepting added BOM cost and layout complexity. | Choose ADS8320UB only when 16-bit resolution is mandatory; AD7872JRZ-REEL provides integrated reference and T/H at lower system cost. |
Compared with AD7872BRZ, AD7872JRZ-REEL delivers 3 dB higher SNR and tighter INL for commercial-grade signal fidelity; versus ADS8320UB, it reduces component count and PCB area by integrating reference and track-and-hold, albeit at 14-bit resolution.
Availability
AD7872JRZ-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 production continuity, and traceable sourcing.
Supply support for AD7872JRZ-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.
The AD7872JRZ-REEL belongs to the AD7871/AD7872 family of fast, complete 14-bit sampling ADCs designed specifically for demanding DSP, telecom, and industrial control applications where integration, speed, and dynamic performance are critical.
FAQ
What is the maximum analog input frequency supported by the AD7872JRZ-REEL?
The AD7872JRZ-REEL supports full-power analog input signals up to 41.5 kHz, determined by its 83 kSPS throughput rate and Nyquist criterion. Its track-and-hold amplifier has a 0.1 dB cutoff at ~500 kHz, ensuring accurate sampling of high-frequency inputs without aperture uncertainty. This makes AD7872JRZ-REEL suitable for spectrum analysis and voiceband applications where preserving harmonic content is essential.
Does the AD7872JRZ-REEL require an external clock source?
No, the AD7872JRZ-REEL does not require an external clock source. It features a self-contained, laser-trimmed internal 2 MHz oscillator activated by tying the CLK pin to VSS. An external TTL-compatible clock may be applied to CLK for system synchronization, but it is optional. This internal clock eliminates timing component count and jitter concerns in the AD7872JRZ-REEL design.
How is the serial data format structured on the AD7872JRZ-REEL?
The AD7872JRZ-REEL outputs 14-bit serial data using three dedicated pins: SSTRB (active-low frame strobe), SCLK (gated serial clock), and SDATA (serial data). Data is valid on the falling edge of SCLK while SSTRB is low. The serial word consists of 14 bits MSB-first, with no start/stop bits. This structure enables direct interfacing with microcontrollers supporting custom serial protocols or GPIO-timed bit-banging.
What is the purpose of the CREF pin on the AD7872JRZ-REEL?
On the AD7872JRZ-REEL, the CREF pin is the decoupling node for the internal 3 V buried Zener reference. A 10 nF capacitor must be connected between CREF and AGND to suppress high-frequency noise generated by internal reference switching. This decoupling is mandatory for achieving specified SNR and integral nonlinearity; omitting it degrades dynamic performance and introduces code-dependent errors in the AD7872JRZ-REEL conversion.
Can the AD7872JRZ-REEL operate with unipolar input signals?
Yes, the AD7872JRZ-REEL can operate with unipolar input signals using external circuitry. By applying the internal 3 V REFOUT to offset the analog input stage, the device converts 0 V to +3 V (or scaled ranges like 0–5 V or 0–10 V using resistor dividers) into straight binary output. The MSB must be inverted in software to convert twos-complement output to straight binary. This configuration is documented in Figure 14 of the AD7872JRZ-REEL datasheet.
AD7872JRZ-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:
- -
AD7872JRZ-REEL FAQ
1.How can I place an order for AD7872JRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7872JRZ-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 AD7872JRZ-REEL reliable?
The price and inventory of AD7872JRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7872JRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7872JRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7872JRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7872JRZ-REEL?
AD7872JRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7872JRZ-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 AD7872JRZ-REEL?
For technical support, including AD7872JRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7872JRZ-REEL requirements.
6.How does Aetrix verify that AD7872JRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7872JRZ-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 AD7872JRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7872JRZ-REEL?
All AD7872JRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7872JRZ-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 AD7872JRZ-REEL part is unused and in its original packaging.
Return procedure for AD7872JRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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