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Analog Devices Inc. AD7899ARSZ-3
- Part No.:
- AD7899ARSZ-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7899ARSZ-3.pdf
- Description:
- IC ADC 14BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,080
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Product details
Overview
AD7899ARSZ-3 from Analog Devices is a 14-bit, 400 kSPS successive-approximation ADC with ±2.5 V analog 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 requiring bipolar signal conditioning at industrial temperature range (–40°C to +85°C).
For engineers reviewing the AD7899ARSZ-3 datasheet, AD7899ARSZ-3 pinout, AD7899ARSZ-3 application, or AD7899ARSZ-3 equivalent, key selection criteria include its ±2.5 V input range, two's complement output coding, STBY-controlled power-down mode (20 µA standby current), and compatibility with both 3 V and 5 V digital logic via VDRIVE.
Technical Context
The AD7899ARSZ-3 integrates a laser-trimmed internal clock oscillator (enabling 400 kSPS throughput without external timing components) and a track/hold amplifier with 500 kHz –0.1 dB full-power bandwidth and 25 ps aperture jitter. Its analog front-end supports ±2.5 V differential input via VINA/VINB pins with overvoltage tolerance up to –4 V to +18 V.
Digital interface uses 14-bit three-state parallel bus (DB0–DB13), active-low CS/RD control, and dual-function BUSY/EOC output. Conversion is initiated by CONVST rising edge; internal reference (2.5 V ±20 mV, 25 ppm/°C TC) is accessible at VREF pin and can be overdriven by external precision references like AD780 or REF43.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete codes for ±2.5 V full-scale range (610.4 µV LSB) |
| Throughput Rate | 400 kSPS - maximum sampling rate achievable using internal clock, enabling real-time monitoring of signals up to ~200 kHz Nyquist frequency |
| Conversion Time | 2.2 µs max - fixed latency from CONVST rising edge to BUSY/EOC assertion, critical for deterministic timing in closed-loop control |
| Track/Hold Acquisition | 0.3 µs max - minimum delay required after conversion completion before next CONVST to ensure 14-bit accuracy on step inputs |
| Reference Voltage | 2.5 V ±20 mV over temperature - buffered internal reference with 6 kΩ output impedance; supports external override for improved stability |
| Power Consumption | 80 mW typical at 5 V - low quiescent power enables use in thermally constrained or battery-backed instrumentation |
| Standby Current | 20 µA max - ultra-low power state activated via STBY pin, reducing system-level power during idle intervals |
Pinout & Package
AD7899ARSZ-3 is housed in a 28-lead Shrink Small Outline Package (SSOP), RoHS-compliant, with 0.65 mm lead pitch and exposed pad thermal design. Package outline conforms to JEDEC MO-153AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference Input/Output | Access point for internal 2.5 V reference; accepts external 2.5 V ±5% reference to override internal source |
| VINA / VINB | Differential Analog Inputs | Accept ±2.5 V input range; VINB tied to AGND for single-ended operation; overvoltage tolerant (–4 V to +18 V) |
| CONVST | Conversion Start | Rising-edge-triggered control that places track/hold into hold mode and initiates ADC conversion sequence |
| BUSY/EOC | Status Output | Open-drain dual-function signal: high during conversion (BUSY), low at completion (EOC) when CONVST is low |
| DB0–DB13 | Parallel Data Bus | 14-bit three-state outputs; MSB = DB13; output coding is two's complement for bipolar ±2.5 V range |
| VDRIVE | Digital I/O Supply | Independent 3 V or 5 V supply for logic interface, enabling direct connection to 3 V microcontrollers without level shifters |
| STBY | Power-Down Control | Active-low input that reduces IDD to 20 µA; retains configuration and reference bias during standby |
Key Features
| Feature | Design Value |
|---|---|
| Single 5 V supply operation | Eliminates need for dual ±15 V rails common in legacy data acquisition, simplifying PCB power architecture |
| ±2.5 V input range with two's complement coding | Directly interfaces with industrial sensor outputs (e.g., strain gauge bridges, RTD transmitters) without external signal scaling |
| Internal 2.5 V reference with 25 ppm/°C TC | Provides stable conversion基准 over –40°C to +85°C without external reference IC, reducing BOM count and layout area |
| Overvoltage protection on analog inputs | Withstands –4 V to +18 V on VINA/VINB, preventing latch-up or damage during sensor disconnect or ESD events |
| 3 V/5 V logic compatibility via VDRIVE | Enables seamless integration with modern low-voltage MCUs (e.g., ARM Cortex-M series) without voltage translation circuitry |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous digitization of ±2.5 V output from pressure transducers and load cells in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor data at up to 400 kSPS for real-time PID loop execution and alarm threshold detection. Use Value: 14-bit resolution and 0.3 µs acquisition time ensure accurate representation of fast transient events (e.g., valve slam, motor startup surges) without missing critical waveform features. | Use Scenario: High-fidelity waveform capture in portable oscilloscopes and automated test fixtures verifying analog circuit performance. IC Role / Device Role / Timing Role: Front-end digitizer synchronized to trigger logic via CONVST, feeding sampled data to FPGA-based decimation and display pipeline. Use Value: Internal clock oscillator eliminates external crystal routing and matching constraints, while BUSY/EOC signaling enables precise timing alignment between acquisition and processing stages. |
| Avionics Sensor Interface | Medical Instrumentation |
Use Scenario: Digitizing ±2.5 V outputs from accelerometers and gyroscopes in flight data recorders operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Ruggedized ADC providing radiation-tolerant (via SOIC/SSOP package) and temperature-stable conversion for safety-critical telemetry streams. Use Value: STBY mode reduces average power consumption during non-acquisition periods, extending battery life in emergency locator transmitters (ELTs) without compromising wake-up latency. | Use Scenario: Signal conditioning for ECG and EEG amplifiers where ±2.5 V dynamic range matches clinical biopotential signal amplitudes. IC Role / Device Role / Timing Role: Isolated ADC stage converting amplified analog bio-signals prior to digital filtering and wireless transmission. Use Value: Two's complement output format simplifies signed arithmetic in embedded DSP firmware, and internal reference ensures consistent gain calibration across production units. |
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 | Same electrical specs and pinout; differs only in SOIC-28 package (vs. SSOP-28 of AD7899ARSZ-3); thermal resistance θJA = 95°C/W in both packages | SOIC variant offers easier hand-soldering and rework; SSOP provides higher board density for space-constrained modules | Select AD7899ARZ-3 for prototyping or low-volume assembly; AD7899ARSZ-3 for high-density production layouts |
| ADS8505IPFB | 16-bit, 250 kSPS, ±10 V input range; requires external reference; no integrated track/hold; SPI interface only (no parallel bus) | Suited for higher-resolution, lower-speed applications where serial interface suffices and ±10 V range is needed | Choose ADS8505IPFB only if resolution >14 bits is mandatory and system architecture supports SPI-only communication |
Compared with AD7899ARZ-3, AD7899ARSZ-3 offers identical functionality in a smaller footprint but requires fine-pitch reflow; compared with ADS8505IPFB, AD7899ARSZ-3 trades 2 bits of resolution for 1.6× higher throughput, integrated reference, and parallel interface-making it optimal for real-time control loops demanding deterministic latency.
Availability
AD7899ARSZ-3 is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, avionics sensor interface, and medical instrumentation requiring stable component supply across extended temperature ranges.
Supply support for AD7899ARSZ-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 high-speed, low-power 14-bit SAR ADCs with integrated references and flexible input ranges for precision data acquisition in harsh industrial and aerospace environments.
FAQ
What is the analog input voltage range supported by the AD7899ARSZ-3?
The AD7899ARSZ-3 supports a bipolar ±2.5 V analog input range on its VINA and VINB pins. This is fixed for the -3 variant and distinct from the ±10 V/±5 V ranges of AD7899-1 or the 0 V to 5 V/0 V to 2.5 V ranges of AD7899-2. Input overvoltage tolerance extends to –4 V to +18 V, protecting against transient excursions without damage.
Does the AD7899ARSZ-3 require an external clock to operate?
No, the AD7899ARSZ-3 does not require an external clock. It includes a laser-trimmed internal oscillator enabling full 400 kSPS throughput with only a CONVST pulse. An external clock (up to 6.5 MHz) may be applied to CLKIN if precise timing synchronization or variable sampling rates are needed, but it is optional-not mandatory-for basic operation of the AD7899ARSZ-3.
What output coding format does the AD7899ARSZ-3 use?
The AD7899ARSZ-3 uses two's complement binary coding for its 14-bit parallel output (DB0–DB13), consistent with its ±2.5 V bipolar input range. This format directly represents negative values without sign extension overhead, simplifying firmware math operations in embedded controllers interfacing with the AD7899ARSZ-3.
How is power managed on the AD7899ARSZ-3 during idle periods?
Power is managed on the AD7899ARSZ-3 via the STBY pin: driving it low places the device in standby mode, reducing supply current to 20 µA max while retaining reference bias and configuration state. Normal operation resumes within 2 µs of STBY returning high, enabling rapid wake-up for burst-mode acquisition without recalibration-critical for energy-efficient designs using the AD7899ARSZ-3.
Can the internal reference of the AD7899ARSZ-3 be replaced with an external reference?
Yes, the internal 2.5 V reference of the AD7899ARSZ-3 can be overdriven by an external 2.5 V ±5% reference connected to the VREF pin. The part's input buffer accepts ±100 µA, supporting precision references such as the AD780 or REF43. When using an external reference, the internal reference is disabled, and all conversion accuracy depends on the external source's stability and noise performance.
AD7899ARSZ-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7899ARSZ-3 FAQ
1.How can I place an order for AD7899ARSZ-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7899ARSZ-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 AD7899ARSZ-3 reliable?
The price and inventory of AD7899ARSZ-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7899ARSZ-3 is usually 5 days.
3.What payment methods are accepted for AD7899ARSZ-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7899ARSZ-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7899ARSZ-3?
AD7899ARSZ-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7899ARSZ-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 AD7899ARSZ-3?
For technical support, including AD7899ARSZ-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7899ARSZ-3 requirements.
6.How does Aetrix verify that AD7899ARSZ-3 is sourced from the original manufacturer or authorized distributors?
All AD7899ARSZ-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 AD7899ARSZ-3 meets industry standards.
7.What is the process for return or replacement of AD7899ARSZ-3?
All AD7899ARSZ-3 units undergo pre-shipment inspection (PSI). If there is an issue with AD7899ARSZ-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 AD7899ARSZ-3 part is unused and in its original packaging.
Return procedure for AD7899ARSZ-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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