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Analog Devices Inc. AD7899BRZ-3
- Part No.:
- AD7899BRZ-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7899BRZ-3.pdf
- Description:
- IC ADC 14BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,809
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Product details
Overview
AD7899BRZ-3 from Analog Devices is a 14-bit, 400 kSPS successive-approximation ADC with ±2.5 V bipolar input range, internal 2.5 V reference, and high-speed parallel interface. It operates from a single 5 V supply, achieves 2.2 µs conversion time and 0.3 µs track/hold acquisition, and is used in precision data acquisition systems for industrial process control and test instrumentation.
For engineers reviewing the AD7899BRZ-3 datasheet, AD7899BRZ-3 pinout, AD7899BRZ-3 application, or AD7899BRZ-3 equivalent, key selection criteria include its ±2.5 V input range, two's complement output coding, 77 dB SNR over temperature, ±1.5 LSB INL, and compatibility with both 3 V and 5 V digital logic via VDRIVE.
Technical Context
The AD7899BRZ-3 integrates a laser-trimmed internal clock oscillator (enabling 400 kSPS throughput without external timing components) and a track/hold amplifier with 4.5 MHz –3 dB bandwidth and 25 ps aperture jitter. Its analog front-end supports ±2.5 V full-scale input with overvoltage tolerance up to –4 V to +18 V.
Conversion control uses edge-triggered CONVST to initiate hold mode and start conversion; BUSY/EOC signals completion. Data is latched onto a 14-bit parallel bus (DB0–DB13) using CS and RD, supporting direct interfacing to microcontrollers and DSPs at either 3 V or 5 V logic levels via configurable VDRIVE.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete output codes for high-fidelity signal digitization |
| Throughput Rate | 400 kSPS - enables real-time sampling of signals up to 200 kHz Nyquist bandwidth |
| Input Range | ±2.5 V - optimized for sensor outputs and conditioned bipolar signals in industrial I/O modules |
| INL (Max) | ±1.5 LSB - ensures monotonicity and <0.01% full-scale linearity error across operating temperature |
| SNR (Min) | 77 dB - supports >12.5 effective number of bits (ENOB) for precision measurement applications |
| Power Dissipation | 80 mW typical - suitable for low-power embedded DAQ systems with thermal constraints |
| Reference | Internal 2.5 V ±20 mV - eliminates need for external reference while allowing overdrive with precision 2.5 V sources |
Pinout & Package
AD7899BRZ-3 is housed in a 28-lead SOIC (Small Outline Integrated Circuit) package with standard 0.3-inch body width and gull-wing leads. Pin 1 is marked by a beveled corner or dot; the package is RoHS-compliant and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA | Analog Input (+) | Main differential input for ±2.5 V range; VINB must be tied to AGND per datasheet configuration |
| VINB | Analog Input (–) | Reference input node; must be connected to AGND for AD7899BRZ-3 operation |
| VREF | Reference I/O | Provides access to internal 2.5 V reference; accepts external 2.5 V ±5% source for improved accuracy |
| CONVST | Conversion Start | Rising-edge triggered; initiates track-to-hold transition and starts 16-clock-cycle conversion sequence |
| BUSY/EOC | Status Output | High during conversion (BUSY), low at completion (EOC); mode determined by CONVST state at end |
| DB0–DB13 | Parallel Data Bus | 14-bit two's complement output; three-state, compatible with 3 V or 5 V logic depending on VDRIVE voltage |
| VDRIVE | Digital Supply | Separate 3 V or 5 V supply for I/O drivers-enables mixed-voltage system interfacing without level shifters |
| STBY | Standby Control | Active-low input; reduces current draw to 20 µA typical for power-gated operation between conversions |
Key Features
| Feature | Design Value |
|---|---|
| Single 5 V supply operation | Eliminates dual-rail power design complexity and reduces BOM count in portable and space-constrained DAQ systems |
| ±2.5 V input range with ±1.5 LSB INL | Optimized for bridge sensor outputs and ±2.5 V industrial transmitters without external signal scaling |
| Internal 2.5 V reference (±20 mV max error) | Enables rapid system bring-up with no external reference required; supports external overdrive for tighter accuracy |
| VDRIVE pin for 3 V/5 V logic compatibility | Allows direct connection to modern 3 V microcontrollers or legacy 5 V systems without interface logic or voltage translation |
| Overvoltage protection (–4 V to +18 V) | Withstands transient faults and wiring errors in harsh industrial environments without latch-up or damage |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, temperature, and flow sensors in PLC-based control cabinets. IC Role / Device Role / Timing Role: High-accuracy digitizer for ±2.5 V sensor outputs; synchronized sampling via CONVST with BUSY/EOC handshaking. Use Value: ±1.5 LSB INL and 77 dB SNR ensure sub-0.01% measurement repeatability across temperature, critical for closed-loop PID stability. |
Use Scenario: Digitizing stimulus response waveforms in benchtop functional testers for analog IC validation. IC Role / Device Role / Timing Role: Fast 400 kSPS acquisition engine with deterministic 2.2 µs conversion latency for time-critical waveform capture. Use Value: Internal clock and parallel interface reduce system timing overhead, enabling tight trigger-to-acquisition synchronization without FPGA logic. |
| Medical Instrumentation | Energy Metering Reference Design |
|
Use Scenario: Signal conditioning path in portable ECG and EEG devices requiring low-noise, low-power analog front-ends. IC Role / Device Role / Timing Role: Bipolar ADC capturing differential bio-potential signals; STBY pin enables ultra-low-power sleep between heartbeat intervals. Use Value: 80 mW typical power and 20 µA standby current extend battery life while maintaining clinical-grade 14-bit resolution. |
Use Scenario: Precision voltage channel in Class 0.2 polyphase energy meters compliant with IEC 62053-22. IC Role / Device Role / Timing Role: High-linearity ADC for scaled phase voltage inputs; internal reference ensures metrology-grade stability over temperature. Use Value: ±2.5 V range matches common metering signal chains; 25 ppm/°C reference TC and 77 dB SNR meet harmonic distortion requirements for accurate kWh calculation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7899ARZ-3 | ±2 LSB INL (vs. ±1.5 LSB), same pinout, same specs otherwise | Suitable for cost-sensitive designs where 0.5 LSB linearity margin is acceptable | Select AD7899BRZ-3 when guaranteed ±1.5 LSB INL is required for calibration-critical systems |
| ADS8505IPW | 16-bit, 250 kSPS, external reference only, SPI interface (not parallel) | Higher resolution but lower speed and serial interface-requires firmware redesign | Choose ADS8505IPW only if resolution >14-bit is mandatory and throughput ≥400 kSPS is not required |
Compared with AD7899ARZ-3, the AD7899BRZ-3 provides tighter linearity for metrology-grade accuracy; compared with ADS8505IPW, it retains parallel interface simplicity and higher throughput but trades off 2 bits of resolution-making it optimal for 14-bit, 400 kSPS industrial DAQ where layout and firmware efficiency matter.
Availability
AD7899BRZ-3 is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7899BRZ-3 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 AD7899 product line delivers fast, low-power, single-supply SAR ADCs with integrated references and flexible I/O for precision data acquisition in industrial, instrumentation, and medical applications.
FAQ
What input voltage range does the AD7899BRZ-3 support?
The AD7899BRZ-3 supports a bipolar ±2.5 V analog input range. VINB must be connected to AGND, and the full-scale input is applied to VINA. This range is fixed for the -3 variant and cannot be reconfigured to ±5 V or 0 V–5 V like other AD7899 versions. The part tolerates overvoltage up to –4 V to +18 V without damage.
Does the AD7899BRZ-3 require an external reference?
No, the AD7899BRZ-3 includes an internal 2.5 V reference with ±20 mV maximum error over temperature. A 0.1 µF capacitor must be placed between VREF and AGND for stability. An external 2.5 V ±5% reference can be connected to VREF to override the internal source for improved accuracy or system-level reference synchronization.
How is data read from the AD7899BRZ-3?
Data is read via a 14-bit parallel bus (DB0–DB13) using standard CS (chip select) and RD (read) strobes. After conversion completes (indicated by BUSY/EOC going low), asserting CS and pulsing RD latches valid two's complement data onto the bus. VDRIVE determines logic voltage level (3 V or 5 V), enabling direct interfacing to diverse host processors.
What is the purpose of the STBY pin on the AD7899BRZ-3?
The STBY pin places the AD7899BRZ-3 into standby mode when driven low, reducing supply current to 20 µA typical. In standby, the internal reference and oscillator remain active but the ADC core and track/hold are disabled. Normal operation resumes within 2 µs after STBY returns high, making it ideal for burst-mode acquisition to minimize average power.
Is the AD7899BRZ-3 pin-compatible with other AD7899 variants?
Yes, all AD7899 variants-including AD7899BRZ-3, AD7899ARZ-1, and AD7899ARZ-2-are pin-compatible in the 28-lead SOIC package. However, input ranges, output coding (two's complement vs. straight binary), and DC accuracy differ by version. System firmware and analog front-end design must match the selected variant's specifications.
AD7899BRZ-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7899BRZ-3 FAQ
1.How can I place an order for AD7899BRZ-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7899BRZ-3 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 AD7899BRZ-3 reliable?
The price and inventory of AD7899BRZ-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7899BRZ-3 is usually 5 days.
3.What payment methods are accepted for AD7899BRZ-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7899BRZ-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7899BRZ-3?
AD7899BRZ-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7899BRZ-3 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 AD7899BRZ-3?
For technical support, including AD7899BRZ-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7899BRZ-3 requirements.
6.How does Aetrix verify that AD7899BRZ-3 is sourced from the original manufacturer or authorized distributors?
All AD7899BRZ-3 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 AD7899BRZ-3 meets industry standards.
7.What is the process for return or replacement of AD7899BRZ-3?
All AD7899BRZ-3 units undergo pre-shipment inspection (PSI). If there is an issue with AD7899BRZ-3, 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 AD7899BRZ-3 part is unused and in its original packaging.
Return procedure for AD7899BRZ-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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