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Analog Devices Inc. AD7899ARS-3
- Part No.:
- AD7899ARS-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7899ARS-3.pdf
- Description:
- IC ADC 14BIT 400KSPS 5V 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,530
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Product details
Overview
AD7899ARS-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 AD7899ARS-3 datasheet, AD7899ARS-3 pinout, AD7899ARS-3 application, or AD7899ARS-3 equivalent, key selection criteria include its ±2.5 V input range, two's complement output coding, STBY-controlled power-down mode (20 µA typ), and compatibility with both 3 V and 5 V digital interfaces via VDRIVE.
Technical Context
The AD7899ARS-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 4.5 MHz –3 dB bandwidth. Its analog front-end supports overvoltage tolerance up to –4 V to +18 V on VINB/VINA, and uses resistor-scaling networks optimized for ±2.5 V full-scale operation.
Conversion control is synchronous: a rising edge on CONVST initiates hold-mode sampling and starts conversion; BUSY/EOC signals completion. Data is latched onto a 14-bit parallel bus (DB0–DB13) using CS and RD, with access times as low as 35 ns (VDRIVE = 5 V) and bus relinquish time independent of external loading per Figure 1 load circuit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete codes with 610.4 µV LSB step size for ±2.5 V range |
| Throughput Rate | 400 kSPS - maximum sustained sampling rate using internal clock; enables real-time monitoring of signals up to 200 kHz Nyquist frequency |
| Input Range | ±2.5 V - fixed bipolar range; no software or hardware configuration required for scaling |
| Reference | Internal 2.5 V ±20 mV - buffered output at VREF pin; supports external override with 2.5 V ±5% sources |
| Power Dissipation | 80 mW typical in normal mode - enables compact, low-thermal-footprint designs; drops to 100 µW in standby |
| DC Accuracy | ±2 LSB INL max - ensures monotonicity and <0.012% full-scale linearity error across –40°C to +85°C |
| Dynamic Performance | 78 dB SNR min @ 100 kHz - meets requirements for medium-bandwidth sensor digitization and closed-loop control feedback |
Pinout & Package
AD7899ARS-3 is housed in a 28-lead Shrink Small Outline Package (SSOP, RS-28), 5.6 mm × 13.9 mm body, 0.635 mm pitch, gull-wing leads. Thermal impedance θJA = 95°C/W; rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VREF) | Reference Input/Output | Access point for internal 2.5 V reference; accepts external 2.5 V ±5% source; requires 0.1 µF decoupling to AGND |
| 2,6 (GND) | Analog Ground | Low-impedance return path for analog circuitry; must connect to system analog ground plane |
| 3,4 (VINB, VINA) | Differential Analog Inputs | VINA accepts ±2.5 V signal; VINB tied to AGND per AD7899-3 configuration; overvoltage tolerant to –4 V/+18 V |
| 5 (VDD) | Positive Supply | 5.0 V ±5% main supply; powers core ADC, track/hold, and reference; decoupling mandatory |
| 7–13, 16–22 (DB13–DB0) | Parallel Data Bus | 14-bit three-state outputs; DB13 = MSB; compatible with 3 V or 5 V logic levels via VDRIVE |
| 14 (OPGND) | Output Driver Ground | Dedicated ground for digital outputs and BUSY/EOC; isolated from AGND to minimize noise coupling |
| 15 (VDRIVE) | Digital I/O Supply | Separate 3 V or 5 V supply for inputs/outputs; enables interfacing with mixed-voltage microcontrollers |
| 23 (BUSY/EOC) | Status Output | Active-high during conversion; transitions low at end-of-conversion; function determined by CONVST state |
| 24 (RD), 25 (CS) | Read Control | Standard parallel interface handshake: CS selects device, RD latches data onto DB0–DB13 |
| 26 (CONVST) | Conversion Start | Rising-edge-triggered; places track/hold into hold mode and initiates conversion sequence |
| 27 (CLKIN) | Clock Select | High at CONVST edge enables external clock; low selects internal oscillator; duty cycle ≤60/40 |
| 28 (STBY) | Standby Enable | Logic high = normal operation; logic low = 20 µA standby current; wake-up time ≤5 µs |
Key Features
| Feature | Design Value |
|---|---|
| Single 5 V supply operation | Eliminates need for dual ±5 V rails; simplifies power design and reduces BOM count in portable and space-constrained systems |
| ±2.5 V input range (AD7899-3 variant) | Optimized for sensors and transducers with ±2.5 V output swing (e.g., strain gauge bridges, MEMS accelerometers) |
| Two's complement output coding | Direct representation of signed analog values; avoids software offset correction in DSP/FPGA processing pipelines |
| Overvoltage protection (–4 V to +18 V) | Withstands transient surges and miswiring in industrial environments without latch-up or damage |
| VDRIVE voltage flexibility | Supports seamless integration with 3 V microcontrollers (e.g., ARM Cortex-M series) while maintaining 5 V analog performance |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous digitization of ±2.5 V outputs from pressure, temperature, and flow sensors in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary ADC in multi-channel data acquisition modules; provides synchronized sampling with 0.3 µs acquisition time between conversions. Use Value: Enables 400 kSPS aggregate throughput across channels while maintaining 14-bit resolution and ±2 LSB INL for calibration-grade accuracy. |
Use Scenario: High-speed stimulus-response measurement in benchtop ATE platforms requiring precise analog stimulus capture. IC Role / Device Role / Timing Role: Front-end digitizer for waveform capture cards; triggered by CONVST with BUSY/EOC handshaking for deterministic latency. Use Value: Delivers 2.2 µs conversion time and 35 ns data access, supporting sub-microsecond loop timing in closed-loop test sequences. |
| Motor Drive Current Sensing | Medical Instrumentation Signal Chain |
|
Use Scenario: Isolated phase-current measurement in servo drives using ±2.5 V shunt amplifier outputs. IC Role / Device Role / Timing Role: High-fidelity current feedback ADC; interfaces directly to isolated amplifiers and FPGA controllers via parallel bus. Use Value: 78 dB SNR at 100 kHz ensures accurate torque estimation and harmonic distortion analysis in variable-frequency drives. |
Use Scenario: Digitizing low-noise biopotential signals (e.g., ECG, EEG) conditioned to ±2.5 V range in portable diagnostic devices. IC Role / Device Role / Timing Role: Precision analog-to-digital converter in battery-powered medical front-ends; leverages STBY mode for ultra-low idle power. Use Value: 20 µA standby current extends battery life; internal reference eliminates external component drift in compact, sealed enclosures. |
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 |
|---|---|---|---|
| AD7899AR-3 | Same electrical specs and pinout; SOIC-28 package instead of SSOP-28; 0.15 mm larger footprint; θJA identical | Preferred where board reworkability or hand-soldering is required; less dense layout than SSOP | Select AD7899AR-3 for prototyping or low-volume production where SSOP assembly infrastructure is unavailable |
| ADS8505IPW | 16-bit, 250 kSPS, ±10 V input range; SPI interface only; no internal reference; requires external REF5025 | Suited for higher-resolution, lower-throughput applications where serial interface and wider input range are acceptable trade-offs | Choose ADS8505IPW when 16-bit resolution and ±10 V range outweigh need for parallel interface and integrated reference |
Compared with AD7899AR-3, the AD7899ARS-3 offers identical performance in a smaller SSOP package for space-constrained PCBs; compared with ADS8505IPW, it trades 2 bits of resolution and serial-only interface for guaranteed 400 kSPS parallel throughput and self-contained 2.5 V reference.
Availability
AD7899ARS-3 is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, motor drive current sensing, and medical instrumentation requiring stable component supply across extended temperature ranges.
Supply support for AD7899ARS-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 family was designed for high-speed, low-power data acquisition in industrial and instrumentation systems where precision, robustness, and single-supply operation are critical.
FAQ
What is the input voltage range supported by the AD7899ARS-3?
The AD7899ARS-3 supports a fixed bipolar input range of ±2.5 V on the VINA pin, with VINB referenced to AGND. This range is factory-configured for the AD7899-3 variant and does not require external resistors or configuration pins to set. Full-scale input corresponds to a 5 V span, yielding a 610.4 µV LSB step size.
Does the AD7899ARS-3 require an external reference voltage?
No, the AD7899ARS-3 includes an internal 2.5 V reference with ±20 mV error over temperature. The VREF pin provides access to this reference and can be decoupled with a 0.1 µF capacitor to AGND. An external 2.5 V ±5% reference may be applied to VREF to override the internal source, but it is not required for basic operation of the AD7899ARS-3.
How does the STBY pin affect power consumption in the AD7899ARS-3?
When STBY is driven low, the AD7899ARS-3 enters standby mode with typical current draw of 20 µA and maximum power dissipation of 100 µW. Wake-up time from standby to ready-for-conversion is ≤5 µs after STBY returns high. This feature enables aggressive power cycling in battery-operated or thermally sensitive AD7899ARS-3 applications.
Can the AD7899ARS-3 interface with a 3 V microcontroller?
Yes, the AD7899ARS-3 supports mixed-voltage interfacing via the VDRIVE pin. By supplying 3 V ±10% to VDRIVE (while maintaining 5 V on VDD), all digital inputs (CONVST, CS, RD, CLKIN, STBY) and outputs (DB0–DB13, BUSY/EOC) operate at 3 V logic levels-enabling direct connection to 3 V microcontrollers without level shifters.
What is the purpose of the OPGND pin on the AD7899ARS-3?
The OPGND pin is the dedicated ground return for the digital output drivers (DB0–DB13 and BUSY/EOC). It must be connected to the system's analog ground plane-not digital ground-to prevent digital switching noise from coupling into the analog section. Separating OPGND from AGND improves PSRR and maintains 78 dB SNR performance in the AD7899ARS-3.
AD7899ARS-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- Parallel
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7899ARS-3 FAQ
1.How can I place an order for AD7899ARS-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7899ARS-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 AD7899ARS-3 reliable?
The price and inventory of AD7899ARS-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7899ARS-3 is usually 5 days.
3.What payment methods are accepted for AD7899ARS-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7899ARS-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7899ARS-3?
AD7899ARS-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7899ARS-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 AD7899ARS-3?
For technical support, including AD7899ARS-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7899ARS-3 requirements.
6.How does Aetrix verify that AD7899ARS-3 is sourced from the original manufacturer or authorized distributors?
All AD7899ARS-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 AD7899ARS-3 meets industry standards.
7.What is the process for return or replacement of AD7899ARS-3?
All AD7899ARS-3 units undergo pre-shipment inspection (PSI). If there is an issue with AD7899ARS-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 AD7899ARS-3 part is unused and in its original packaging.
Return procedure for AD7899ARS-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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