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Analog Devices Inc. AD7898AR-3
- Part No.:
- AD7898AR-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7898AR-3.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,641
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Product details
Overview
AD7898AR-3 from Analog Devices is a 12-bit, 220 kSPS successive-approximation ADC in an 8-lead SOIC package, operating from a single 5 V supply with ±2.5 V bipolar input range and on-chip track/hold amplifier. It supports two serial interface modes (Mode 0 internal clock, Mode 1 external SCLK), delivers 71 dB SNR at 30 kHz, and consumes ≤22.5 mW - used in precision data acquisition for industrial sensor interfaces and portable instrumentation.
For engineers reviewing the AD7898AR-3 datasheet, AD7898AR-3 pinout, AD7898AR-3 application, or AD7898AR-3 equivalent, key selection considerations include its ±2.5 V input range (vs. ±10 V for AD7898AR-10), VDRIVE-compatible 3 V/5 V logic interface, 3.3 µs conversion time in Mode 0, and power-down capability in Mode 1 for battery-sensitive designs.
Technical Context
The AD7898AR-3 implements a laser-trimmed internal oscillator for Mode 0 operation and accepts external SCLK up to 3.7 MHz in Mode 1, enabling flexible timing control. Its analog front-end uses a resistive ladder network (R1 = R2 = 6.5 kΩ, R3 open) to scale ±2.5 V inputs onto a 2.5 V reference, delivering 1.22 mV/LSB resolution with twos-complement output coding.
Dynamic performance is specified across both modes: 71 dB SNR, –78 dB THD, and –89 dB peak spurious at 30 kHz; full-power bandwidth is 4.7 MHz @ 3 dB and 2.4 MHz @ 1 dB. Power-down mode reduces IDD to 20 µA over temperature, with 4.33 µs wake-up time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes; supports 4096 discrete levels for high-fidelity signal digitization. |
| Throughput Rate | 220 kSPS max - enables real-time sampling of signals up to ~100 kHz Nyquist bandwidth. |
| Analog Input Range | ±2.5 V - matched to standard industrial sensor outputs and low-voltage transducers without external scaling. |
| Reference Input | 2.5 V ±5% - requires stable external reference (e.g., AD780); on-chip buffering eliminates loading effects. |
| Power Dissipation | 22.5 mW max - enables use in thermally constrained or battery-powered systems with minimal thermal design overhead. |
| Signal-to-Noise+Distortion | 71 dB min at 30 kHz - ensures ≥11.5 ENOB for accurate measurement of medium-frequency analog waveforms. |
| Full-Power Bandwidth | 4.7 MHz @ 3 dB - supports subsampling applications where input signals exceed Nyquist but remain within track/hold capability. |
Pinout & Package
AD7898AR-3 is housed in an 8-lead SOIC (R-8) package with gull-wing leads, 1.27 mm pitch, and JEDEC MS-012AC footprint. Thermal impedance θJA = 170°C/W; maximum power dissipation = 450 mW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Accepts buffered 2.5 V ±5% reference; requires 0.1 µF decoupling capacitor for noise immunity and stability. |
| 2 - VIN | Analog input channel | ±2.5 V bipolar input with 5 kΩ minimum input resistance; benign resistive ladder front-end avoids dynamic charging currents. |
| 3 - GND | Analog ground reference | Common return for track/hold, comparator, DAC, and digital circuitry; must connect to clean analog ground plane. |
| 4 - SCLK | Serial clock input | Controls data readout in both modes; in Mode 1, also serves as conversion clock source (up to 3.7 MHz). |
| 5 - SDATA | Serial data output | 16-bit twos-complement word (4 leading zeros + 12-bit result), MSB-first; three-stated after final bit. |
| 6 - VDRIVE | Logic power supply | Sets I/O voltage level (2.7–5.25 V); enables direct interfacing to 3 V or 5 V microprocessors without level shifters. |
| 7 - CS / CONVST | Chip select / convert start | Active-low chip select in Mode 1; edge-triggered convert-start in Mode 0; dual-function pin simplifies control logic. |
| 8 - VDD | Analog/digital power supply | Single 4.75–5.25 V supply powers entire IC; decoupling required near pin for noise-sensitive analog section. |
Key Features
| Feature | Design Value |
|---|---|
| Flexible serial interface | Two operational modes: Mode 0 (internal oscillator, 3-wire, 220 kSPS) and Mode 1 (external SCLK, 3-wire, 220 kSPS + power-down). |
| VDRIVE logic compatibility | Independent 2.7–5.25 V logic supply allows native interfacing to 3 V or 5 V processors without external level translation. |
| On-chip track/hold amplifier | Acquisition time ≤450 ns (AD7898AR-3); supports full-scale input frequencies up to 4.7 MHz @ 3 dB for subsampling. |
| Bipolar ±2.5 V input range | Optimized for low-voltage sensors and transducers; eliminates need for external signal conditioning or gain stages. |
| Low-power operation | 22.5 mW max active power; 20 µA max IDD in power-down mode - extends battery life in portable instrumentation. |
Applications
| Industrial Process Monitoring | Portable Data Loggers |
|---|---|
|
Use Scenario: Continuous monitoring of temperature, pressure, and flow sensors in factory automation systems with 4–20 mA or ±10 V outputs scaled to ±2.5 V. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog sensor outputs at 100 kSPS; internal track/hold captures fast transients during PLC scan cycles. Use Value: Single-supply 5 V operation simplifies power architecture; 71 dB SNR ensures <0.05% measurement error in 16-bit control loops. |
Use Scenario: Battery-powered environmental sensor nodes measuring humidity, CO₂, and ambient light over multi-day deployments. IC Role / Device Role / Timing Role: ADC samples analog sensor outputs intermittently; Mode 1 power-down reduces average current to µA range between acquisitions. Use Value: 20 µA max IDD in power-down extends 2× AA battery life beyond 12 months; VDRIVE = 3.3 V enables direct connection to ultra-low-power MCU. |
| Medical Instrumentation Front-End | Test & Measurement Equipment |
|
Use Scenario: Signal conditioning for ECG/EEG amplifiers requiring high CMRR, low noise, and precise DC-coupled bipolar input handling. IC Role / Device Role / Timing Role: ADC digitizes amplified bio-potential signals; ±2.5 V range matches typical amplifier output swing while preserving headroom. Use Value: 12-bit resolution with no missing codes ensures accurate waveform morphology capture; 4.7 MHz full-power bandwidth supports >100 Hz clinical bandwidths. |
Use Scenario: Modular benchtop instruments (e.g., digital multimeters, oscilloscope channels) needing compact, high-speed digitization with minimal board space. IC Role / Device Role / Timing Role: ADC provides primary digitization path; 8-lead SOIC package saves PCB area versus multi-chip alternatives with external track/hold and reference. Use Value: Integrated track/hold, reference buffer, and serial interface reduce component count by ≥4 parts per channel; 220 kSPS throughput supports 100 kHz signal analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7898AR-10 | ±10 V input range; 24 kΩ input resistance; 3.6 MHz full-power bandwidth @ 3 dB; identical package and serial interface. | Designed for higher-voltage industrial sensors (e.g., strain gauges, RTDs with excitation) requiring wider dynamic range. | Select AD7898AR-10 when input signals exceed ±2.5 V; not interchangeable without front-end redesign due to different scaling resistors and input impedance. |
| ADS7822U | 12-bit, 200 kSPS, SPI-compatible; 2.7–5.25 V supply; ±2.5 V input via internal reference; no VDRIVE pin; 8-pin SOIC. | Lacks power-down mode and flexible dual-mode serial interface; uses internal 2.5 V reference instead of external REF IN. | Choose ADS7822U for simplified BOM (no external reference needed) and lower cost; AD7898AR-3 preferred when external reference control or Mode 1 power-down is required. |
Compared with AD7898AR-10, the AD7898AR-3 offers tighter input range and higher full-power bandwidth for low-voltage signals, while ADS7822U trades external reference flexibility and power-down capability for integration simplicity - making AD7898AR-3 optimal for precision, low-power, externally referenced systems.
Availability
AD7898AR-3 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, medical instrumentation front-ends, and test & measurement equipment requiring stable component supply and long-term production continuity.
Supply support for AD7898AR-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 AD7898 product line delivers compact, low-power, high-speed SAR ADCs with integrated track/hold and flexible serial interfaces - designed specifically for space-constrained, battery-aware, and precision industrial/data acquisition systems.
FAQ
What is the input voltage range supported by the AD7898AR-3?
The AD7898AR-3 supports a bipolar analog input range of ±2.5 V, optimized for low-voltage sensors and transducers. This differs from the AD7898AR-10 (±10 V) due to internal resistor ladder configuration. Input resistance is 5 kΩ minimum, and the front-end uses a benign resistive structure that avoids dynamic charging currents - critical for stable sampling of high-impedance sources. The AD7898AR-3 requires an external 2.5 V reference applied to the REF IN pin.
How does the AD7898AR-3 handle power management in portable applications?
The AD7898AR-3 supports power-down mode exclusively in Mode 1 operation, reducing IDD to 20 µA maximum over temperature. Wake-up time from power-down is 4.33 µs, enabling rapid resumption of sampling. In active operation, it consumes ≤22.5 mW at 5 V - significantly lower than comparable 12-bit ADCs without integrated track/hold. The VDRIVE pin allows logic-level optimization (e.g., 3.3 V) independent of VDD, further minimizing system-level power.
Can the AD7898AR-3 interface directly with a 3 V microcontroller?
Yes - the AD7898AR-3 features a dedicated VDRIVE pin that sets the logic I/O voltage level independently of VDD. By connecting VDRIVE to the 3 V microcontroller supply, all digital pins (CS/CONVST, SCLK, SDATA) operate at 3 V logic levels with guaranteed VOH ≥ 2.6 V and VOL ≤ 0.4 V at 200 µA load. No external level shifters are required, simplifying interconnect and improving signal integrity in mixed-voltage systems.
What are the timing requirements for achieving 220 kSPS throughput with the AD7898AR-3?
To achieve 220 kSPS, the AD7898AR-3 must operate in Mode 0 with VDRIVE = 5 V ±5% and SCLK frequency ≤13 MHz. Conversion time is fixed at 3.3 µs; quiet time is 0.1 µs. Data access occurs after conversion completes, requiring proper synchronization between CONVST pulse and SCLK. In Mode 1, 220 kSPS requires SCLK = 3.7 MHz (16 cycles per conversion), with tQUIET ≥100 ns between conversions. Both modes guarantee full specifications at this rate.
Does the AD7898AR-3 require external components for stable operation?
Yes - the AD7898AR-3 requires a 0.1 µF ceramic capacitor on the REF IN pin for reference stability, and local 0.1 µF + 10 µF decoupling on VDD. The analog input (VIN) benefits from source impedance ≤1 kΩ to maintain THD < –78 dB at 30 kHz. For optimal dynamic performance, separate analog and digital ground planes should connect at a single point near the GND pin, and the REF IN trace must be routed away from noisy digital lines to prevent coupling.
AD7898AR-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 220k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7898AR-3 FAQ
1.How can I place an order for AD7898AR-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7898AR-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 AD7898AR-3 reliable?
The price and inventory of AD7898AR-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7898AR-3 is usually 5 days.
3.What payment methods are accepted for AD7898AR-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7898AR-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7898AR-3?
AD7898AR-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7898AR-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 AD7898AR-3?
For technical support, including AD7898AR-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7898AR-3 requirements.
6.How does Aetrix verify that AD7898AR-3 is sourced from the original manufacturer or authorized distributors?
All AD7898AR-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 AD7898AR-3 meets industry standards.
7.What is the process for return or replacement of AD7898AR-3?
All AD7898AR-3 units undergo pre-shipment inspection (PSI). If there is an issue with AD7898AR-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 AD7898AR-3 part is unused and in its original packaging.
Return procedure for AD7898AR-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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