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Analog Devices Inc. AD7899ARS-2
- Part No.:
- AD7899ARS-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
AD7899ARS-2.pdf
- Description:
- IC ADC 14BIT SAR 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,442
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Product details
Overview
AD7899ARS-2 from Analog Devices is a 14-bit, 400 kSPS successive-approximation ADC with unipolar input ranges of 0 V to 2.5 V or 0 V to 5 V, single 5 V supply operation, internal 2.5 V reference, and high-speed parallel interface. It features 2.2 µs conversion time, 0.3 µs track/hold acquisition, and ±2 LSB INL - used in precision data acquisition systems for industrial process control and automated test equipment.
For engineers reviewing the AD7899ARS-2 datasheet, AD7899ARS-2 pinout, AD7899ARS-2 application, or AD7899ARS-2 equivalent, key selection criteria include unipolar input range support, 14-bit resolution with guaranteed no missing codes, 3 V/5 V logic compatibility via VDRIVE, STBY power-down capability, and SSOP-28 package suitability for space-constrained PCB layouts.
Technical Context
The AD7899ARS-2 implements a laser-trimmed internal clock oscillator (enabling 400 kSPS throughput) or accepts external CLKIN up to 6.5 MHz; conversion is initiated by CONVST rising edge, with BUSY/EOC signaling completion. Its track/hold amplifier achieves 0.3 µs acquisition to ±1/2 LSB and supports full-scale sine wave inputs up to 500 kHz (–0.1 dB bandwidth).
Signal conditioning includes overvoltage protection allowing analog inputs to reach –1 V to +18 V without damage, and reference architecture permits either internal 2.5 V ±20 mV reference (25 ppm/°C TC) or external 2.5 V reference injection via VREF pin with 6 kΩ output impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete output levels for high-fidelity digitization of analog sensor or signal chain outputs. |
| Throughput Rate | 400 kSPS - enables real-time sampling of signals up to 200 kHz (Nyquist-limited) in closed-loop control or waveform capture. |
| Input Ranges | 0 V to 2.5 V or 0 V to 5 V - unipolar configuration optimized for single-supply systems using ground-referenced sensors or DAC outputs. |
| INL / DNL | ±2 LSB max / ±1 LSB max - ensures monotonicity and predictable code transitions critical for closed-loop feedback accuracy. |
| Conversion Time | 2.2 µs max - defines minimum inter-conversion interval; supports deterministic timing in synchronized multi-channel acquisition. |
| Power Dissipation | 80 mW typ (normal mode), 100 µW max (standby) - balances performance and battery life in portable instrumentation. |
| Reference | Internal 2.5 V ±20 mV (TMIN to TMAX), 25 ppm/°C TC - eliminates external reference component while maintaining system-level DC accuracy. |
| Logic Interface | VDRIVE-pin configurable for 3 V or 5 V I/O - allows direct connection to mixed-voltage microcontrollers without level-shifting circuitry. |
Pinout & Package
The AD7899ARS-2 is housed in a 28-lead Shrink Small Outline Package (SSOP, RS-28), 5.6 mm × 10.2 mm body, 0.65 mm pitch, gull-wing leads. Thermal resistance θJA = 95°C/W; rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference Input/Output | Access point for internal 2.5 V reference; accepts external 2.5 V ±5% source to override internal reference with improved stability or system synchronization. |
| VINA / VINB (Pins 3–4) | Analog Inputs | Differential-capable inputs configured for unipolar ranges: tie VINB to GND for 0 V–5 V; tie together for 0 V–2.5 V. Supports overvoltage tolerance up to –1 V/+18 V. |
| VDD (Pin 5) | Analog Power Supply | 5.0 V ±5% supply powering core ADC, track/hold, and reference; requires local 0.1 µF decoupling to AGND. |
| DB13–DB0 (Pins 7–13, 16–22) | Parallel Data Outputs | 14-bit three-state bus delivering straight binary output; timing-critical access window defined by RD/CS setup/hold and t6 (≤40 ns at VDRIVE = 3 V). |
| OPGND (Pin 14) | Output Driver Ground | Dedicated analog ground return for DBx and BUSY/EOC outputs - must connect to system analog ground plane to minimize digital switching noise coupling. |
| VDRIVE (Pin 15) | Digital I/O Supply | Independent 3 V or 5 V supply for logic interface; enables interoperability with 3 V microcontrollers while VDD remains at 5 V for analog performance. |
| BUSY/EOC (Pin 23) | Status Output | Open-drain dual-function signal: active-high BUSY during conversion; transitions low at end-of-conversion (EOC) to indicate data validity. |
| RD / CS (Pins 24–25) | Read Control Inputs | Standard parallel interface strobes: CS enables device, RD latches data onto DBx bus; zero setup/hold required when VDRIVE = 5 V. |
| CONVST (Pin 26) | Conversion Start | Rising-edge-triggered command that places track/hold into hold mode and initiates conversion sequence - synchronizes sampling across multiple AD7899 devices. |
| CLKIN (Pin 27) | External Clock Input | Selects clock source: high at CONVST edge enables external clock (≤6.5 MHz, ≤60/40 duty); low selects internal oscillator for fixed 400 kSPS rate. |
| STBY (Pin 28) | Standby Mode Control | Active-low input reducing supply current to 20 µA typ; exits standby within 2 µs (tWAKE-UP) to resume conversion without recalibration. |
Key Features
| Feature | Design Value |
|---|---|
| Unipolar Input Flexibility | Supports both 0 V–2.5 V and 0 V–5 V ranges via pin-strapping - eliminates need for external gain stages in sensor front-ends with varying output spans. |
| Integrated Reference Architecture | On-chip 2.5 V reference with 6 kΩ output impedance and 25 ppm/°C TC - reduces BOM count and layout area versus discrete reference solutions. |
| VDRIVE-Pin Logic Compatibility | Separate 3 V/5 V digital supply rail - enables direct interfacing to low-voltage FPGAs or ARM Cortex-M MCUs without level translators or voltage droppers. |
| Overvoltage Protected Inputs | Analog inputs withstand –1 V to +18 V continuously - prevents latch-up or damage during sensor disconnect, ESD events, or power sequencing faults. |
| No Missing Codes Guaranteed | Monotonic 14-bit transfer function across full temperature range - essential for position encoders, servo control loops, and safety-critical monitoring. |
| Low-Power Standby Mode | 20 µA typical quiescent current with 2 µs wake-up - ideal for battery-powered DAQ systems requiring periodic wake-and-scan operation. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous digitization of 4–20 mA loop outputs, thermocouple signals, and pressure transducer voltages in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC capturing sensor data at 100–400 kSPS with deterministic latency for real-time PID control execution. Use Value: ±2 LSB INL and 77 dB SNR ensure <0.05% measurement uncertainty across –40°C to +85°C, meeting IEC 61000-4 immunity requirements. | Use Scenario: High-speed stimulus-response testing of analog circuits, RF components, and power supplies using pattern generators and digitizers. IC Role / Device Role / Timing Role: Digitizer front-end synchronized to system clock via CONVST/CLKIN for precise time-domain analysis of transient responses. Use Value: 0.3 µs track/hold acquisition enables accurate capture of fast edges (e.g., power supply turn-on glitches) without aperture error degradation. |
| Portable Data Loggers | Motor Drive Current Sensing |
Use Scenario: Battery-operated environmental monitors logging temperature, humidity, and air quality over weeks on single charge. IC Role / Device Role / Timing Role: Low-power ADC activated periodically by microcontroller; enters STBY between samples to minimize average current draw. Use Value: 100 µW standby power and 2 µs wake-up allow >1-year battery life with 1-second sampling intervals using standard CR2032 cells. | Use Scenario: Isolated phase current measurement in 3-phase inverters using shunt resistors and isolated amplifiers feeding unipolar ADC inputs. IC Role / Device Role / Timing Role: High-speed digitizer capturing current waveforms at PWM carrier frequency harmonics for field-oriented control (FOC) algorithms. Use Value: 400 kSPS throughput and 500 kHz –0.1 dB bandwidth support accurate reconstruction of 10–20 kHz motor current harmonics for torque ripple reduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit unipolar ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8325IPW | 16-bit resolution, SPI interface, 100 kSPS max, external reference required | Lacks parallel interface and integrated reference; suited for lower-speed, higher-precision, microcontroller-based designs | Select when 16-bit resolution outweighs speed and interface simplicity; requires external 2.5 V reference and level-shifting for 3 V logic. |
| MAX11607EEE+ | 14-bit, 250 kSPS, internal reference, I²C interface, 8-channel mux | Serial interface and multiplexed inputs reduce channel count per package but increase software overhead and latency | Prefer for multi-sensor systems where board space and wiring complexity favor serial topology over parallel bus routing. |
Compared with ADS8325IPW and MAX11607EEE+, the AD7899ARS-2 uniquely combines 400 kSPS parallel throughput, unipolar 0–5 V input flexibility, and self-contained 2.5 V reference - making it optimal for high-speed, space-constrained, single-channel industrial DAQ where deterministic timing and minimal external components are critical.
Availability
AD7899ARS-2 is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, portable data loggers, and motor drive current sensing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7899ARS-2 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The AD7899 product line delivers high-speed, low-power, 14-bit SAR ADCs with integrated references and flexible input configurations - designed specifically for industrial automation, test instrumentation, and embedded data acquisition where accuracy, speed, and reliability coexist under harsh operating conditions.
FAQ
What input voltage ranges does the AD7899ARS-2 support?
The AD7899ARS-2 supports two unipolar analog input ranges: 0 V to 2.5 V and 0 V to 5 V. Configuration is achieved by strapping VINB to GND (for 0–5 V) or tying VINA and VINB together (for 0–2.5 V). This flexibility eliminates external scaling circuitry in sensor interface designs. The AD7899ARS-2 does not support bipolar ranges like ±5 V or ±10 V - those are handled by the AD7899-1 variant.
Does the AD7899ARS-2 require an external reference voltage?
No, the AD7899ARS-2 includes an internal 2.5 V reference with ±20 mV accuracy over temperature and 25 ppm/°C temperature coefficient. A 0.1 µF capacitor from VREF to AGND suffices for operation. However, the VREF pin also accepts an external 2.5 V ±5% reference - useful when system-level accuracy or synchronization across multiple AD7899ARS-2 devices is required.
How does the VDRIVE pin affect digital interface compatibility for the AD7899ARS-2?
The VDRIVE pin on the AD7899ARS-2 sets the logic threshold and output drive strength for DBx, BUSY/EOC, RD, CS, CONVST, CLKIN, and STBY pins. When tied to 3 V ±10%, the AD7899ARS-2 interfaces directly with 3 V microcontrollers or FPGAs without level shifters. At 5 V, it matches legacy 5 V systems. This dual-voltage capability is intrinsic to the AD7899ARS-2 design and requires no external components.
What is the purpose of the OPGND pin on the AD7899ARS-2, and how should it be connected?
The OPGND pin (Pin 14) is the dedicated analog ground return for all digital output drivers (DB13–DB0 and BUSY/EOC) on the AD7899ARS-2. It must be connected to the system's analog ground plane - not the digital ground - to prevent digital switching noise from modulating the analog reference or input paths. Separating OPGND from AGND (Pin 2/6) is critical for achieving specified 77 dB SNR and ±2 LSB INL performance.
Can the AD7899ARS-2 operate in a power-saving mode, and what is its standby current?
Yes, the AD7899ARS-2 features a hardware-controlled standby mode activated by pulling STBY (Pin 28) low. In this state, supply current drops to 20 µA typical (5 µA typical per datasheet), reducing power dissipation to 100 µW maximum. Wake-up time from standby to first valid conversion is 2 µs (tWAKE-UP), enabling rapid burst-mode acquisition in battery-powered AD7899ARS-2 applications without sacrificing responsiveness.
AD7899ARS-2 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:
- 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:
- -
AD7899ARS-2 FAQ
1.How can I place an order for AD7899ARS-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7899ARS-2 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-2 reliable?
The price and inventory of AD7899ARS-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7899ARS-2 is usually 5 days.
3.What payment methods are accepted for AD7899ARS-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7899ARS-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7899ARS-2?
AD7899ARS-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7899ARS-2 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-2?
For technical support, including AD7899ARS-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7899ARS-2 requirements.
6.How does Aetrix verify that AD7899ARS-2 is sourced from the original manufacturer or authorized distributors?
All AD7899ARS-2 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-2 meets industry standards.
7.What is the process for return or replacement of AD7899ARS-2?
All AD7899ARS-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7899ARS-2, 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-2 part is unused and in its original packaging.
Return procedure for AD7899ARS-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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