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Analog Devices Inc. AD7872BRZ-REEL
- Part No.:
- AD7872BRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7872BRZ-REEL.pdf
- Description:
- IC ADC 14BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,962
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Product details
Overview
AD7872BRZ-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 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 - enabling high-fidelity signal acquisition in DSP-based modems and spectrum analyzers.
For engineers reviewing the AD7872BRZ-REEL datasheet, AD7872BRZ-REEL pinout, AD7872BRZ-REEL application, or AD7872BRZ-REEL equivalent, key selection considerations include its serial-only output architecture, internal 2 MHz clock, ±3 V bipolar input range, 16-pin SOIC package, and compatibility with microprocessor and DSP timing requirements for real-time sampling systems.
Technical Context
The AD7872BRZ-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 signals to 14-bit accuracy in ≤2 μs, and conversion time is fixed at 10.5–11 μs using the internal oscillator.
Unlike the parallel/serial-flexible AD7871, the AD7872BRZ-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 parallel data bus pins and byte-enable logic, confirming strict serial interface operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees no missing codes; LSB = 366 µV for ±3 V full-scale range |
| Throughput Rate | 83 kSPS - maximum sustained sampling rate with internal 2 MHz clock |
| SNR @ 10 kHz | 80 dB min - defines dynamic fidelity for audio and baseband signal capture |
| Analog Input Range | ±3 V bipolar - compatible with standard op-amp signal conditioning stages |
| Reference Output | 3.00 V ±10 mV - internally trimmed Zener reference with 500 µA load capability |
| Power Dissipation | 50 mW typ - enables low-thermal-load integration in dense signal chains |
| Data Interface | Serial only (SDATA/SCLK/SSTRB) - eliminates parallel bus routing; requires external pull-ups |
Pinout & Package
AD7872BRZ-REEL is housed in a 16-pin SOIC package (body width 3.9 mm), RoHS-compliant, tape-and-reel format. Pin 1 is CONTROL; Pin 16 is VDD (tied to Pin 9).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CONTROL) | Serial clock gating control | Selects continuous (−5 V) or gated (0 V) SCLK output; determines serial framing behavior |
| 2 (CONVST) | Asynchronous conversion trigger | Rising edge initiates track-to-hold transition and starts conversion cycle |
| 3 (CLK) | Internal/external clock enable | Tied to VSS to activate internal 2 MHz oscillator; accepts external TTL clock |
| 4 (SSTRB) | Serial frame strobe | Active-low three-state output; provides start-of-frame pulse for SDATA alignment |
| 5 (SCLK) | Gated serial clock | Open-drain output requiring 2 kΩ pull-up; clocks SDATA on falling edge |
| 6 (SDATA) | Serial data output | Three-state output valid on SCLK falling edge when SSTRB is low; needs 4.7 kΩ pull-up |
| 8 (DGND) | Digital ground return | Isolated ground node for digital logic; must be separated from AGND per layout guidelines |
| 9 & 16 (VDD) | +5 V analog supply | Both pins must be connected together and decoupled with 0.1 µF ceramic capacitor |
| 11 (CREF) | Reference decoupling node | Requires 10 nF capacitor to AGND to minimize reference noise and ensure dc accuracy |
| 12 (AGND) | Analog ground reference | Ground return for analog circuitry; must be star-connected and isolated from DGND |
| 13 (REFOUT) | 3 V reference output | Provides stable 3.00 V reference for external circuitry; max 500 µA load |
| 14 (VIN) | Bipolar analog input | Accepts ±3 V differential input; 15 kΩ typical input impedance; referenced to AGND |
| 15 (VSS) | −5 V analog supply | Negative rail for analog section; requires local 0.1 µF decoupling to AGND |
Key Features
| Feature | Design Value |
|---|---|
| Complete monolithic ADC | Integrates SAR core, track-and-hold, 3 V Zener reference, and serial interface - no external components required beyond decoupling caps and pull-ups |
| Self-contained timing | Internal 2 MHz laser-trimmed oscillator eliminates need for external clock source or timing components |
| High dynamic performance | 80 dB SNR and −86 dB THD at 10 kHz enable accurate digitization of speech, modem, and spectral signals |
| Low power operation | 50 mW typical dissipation supports thermally constrained embedded and portable instrumentation designs |
| Bipolar input support | ±3 V input range with twos-complement coding simplifies interfacing to AC-coupled sensor and communication front-ends |
Applications
| Speech Recognition Systems | DSP-Based Modems |
|---|---|
Use Scenario: Digitizing microphone preamplifier outputs in voice-controlled devices with real-time feature extraction. IC Role / Device Role / Timing Role: ADC sampling voice band (0–4 kHz) at ≥83 kSPS with low distortion to preserve phoneme discrimination. Use Value: 80 dB SNR ensures clean spectral representation; serial interface reduces MCU GPIO count and PCB routing complexity. | Use Scenario: Converting analog line signals in V.34/V.90 modems for digital equalization and demodulation. IC Role / Device Role / Timing Role: High-fidelity acquisition of baseband analog waveforms prior to QAM constellation mapping. Use Value: −86 dB THD prevents intermodulation artifacts; ±3 V input accommodates standard line driver output swing. |
| Spectrum Analyzers | DSP Servo Control Loops |
Use Scenario: Capturing RF downconverted IF signals for FFT-based frequency domain analysis in benchtop analyzers. IC Role / Device Role / Timing Role: Sampling up to 41.5 kHz full-power signals with precise timing jitter control via CONVST-triggered hold mode. Use Value: 2 µs track/hold acquisition enables accurate wideband capture; internal clock synchronization minimizes sampling uncertainty. | Use Scenario: Monitoring motor current/voltage feedback in closed-loop motion controllers requiring fast response and precision. IC Role / Device Role / Timing Role: Real-time analog sensing at servo update rates, synchronized to PWM cycles via CONVST. Use Value: 83 kSPS throughput supports sub-12 µs control loop latency; bipolar input directly interfaces to current-sense amplifier outputs. |
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; no moisture sensitivity level (MSL) rating; through-hole mounting | Preferred for prototyping, low-volume industrial controls, or legacy board designs requiring socketing | Select AD7872BN when manual assembly, rework, or long-term availability of through-hole variants is required |
| ADS8320UB | 16-bit resolution, SPI-compatible serial interface, 100 kSPS, single +5 V supply, no internal reference | Higher resolution and simpler supply scheme, but requires external reference and level-shifting for ±3 V input | Choose ADS8320UB when 16-bit precision outweighs design simplicity and bipolar input convenience |
Compared with AD7872BN, AD7872BRZ-REEL offers surface-mount reliability and automated assembly compatibility; versus ADS8320UB, it trades resolution for integrated reference, bipolar input, and lower system component count - making it optimal for cost-sensitive, high-volume DSP front-ends where 14-bit fidelity suffices.
Availability
AD7872BRZ-REEL is available at Aetrix Electronics and suitable for digital signal processing, high-speed modems, and spectrum analysis applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7872BRZ-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 AD7872BRZ-REEL belongs to the AD7871/AD7872 family of complete sampling ADCs designed specifically for demanding real-time signal acquisition in DSP, telecom, and instrumentation systems where integration, speed, and dynamic accuracy are critical.
FAQ
What is the function of the CONTROL pin on the AD7872BRZ-REEL?
The CONTROL pin on the AD7872BRZ-REEL selects serial clock behavior: at 0 V it enables gated SCLK (active only during serial transmission), and at −5 V it enables continuous SCLK output. This pin replaces the 14/8/CLK functionality of the AD7871 and is essential for configuring serial data framing and timing alignment in the AD7872BRZ-REEL.
Does the AD7872BRZ-REEL support parallel data output?
No, the AD7872BRZ-REEL supports serial output only via SDATA, SCLK, and SSTRB pins. Unlike the AD7871, it has no parallel data bus pins (e.g., DB0–DB13) or byte-enable logic. Its pinout and functional block diagram confirm exclusive serial interface operation - a deliberate differentiation within the AD7871/AD7872 family.
What is the recommended decoupling for the CREF pin of the AD7872BRZ-REEL?
The AD7872BRZ-REEL CREF pin requires a 10 nF capacitor connected directly between CREF and AGND to stabilize the internal 3 V Zener reference and minimize noise-induced errors in dc accuracy and SNR. This value is specified in the datasheet's Theory of Operation section and must be placed close to the pin with short traces to maintain performance.
Can the AD7872BRZ-REEL operate with a single +5 V supply?
No, the AD7872BRZ-REEL requires dual ±5 V analog supplies (VDD = +5 V, VSS = −5 V) to support its ±3 V bipolar input range and internal circuitry. The datasheet specifies absolute maximum ratings and operating conditions exclusively for dual-rail operation; single-supply use is not supported and may cause malfunction or damage.
What is the maximum external load current allowed on the REFOUT pin of the AD7872BRZ-REEL?
The REFOUT pin of the AD7872BRZ-REEL is rated for a maximum external load current of 500 µA across the full temperature range. Exceeding this limit degrades reference accuracy and stability; the datasheet further specifies that the maximum recommended capacitance on REFOUT is 50 pF for normal operation to avoid oscillation or settling issues.
AD7872BRZ-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:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7872BRZ-REEL FAQ
1.How can I place an order for AD7872BRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7872BRZ-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 AD7872BRZ-REEL reliable?
The price and inventory of AD7872BRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7872BRZ-REEL is usually 5 days.
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AD7872BRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7872BRZ-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 AD7872BRZ-REEL?
For technical support, including AD7872BRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7872BRZ-REEL requirements.
6.How does Aetrix verify that AD7872BRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7872BRZ-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 AD7872BRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7872BRZ-REEL?
All AD7872BRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7872BRZ-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 AD7872BRZ-REEL part is unused and in its original packaging.
Return procedure for AD7872BRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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