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Analog Devices Inc. AD7893AR-2
- Part No.:
- AD7893AR-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7893AR-2.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,416
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Product details
Overview
AD7893AR-2 from Analog Devices is a 12-bit, serial-output analog-to-digital converter (ADC) with 6 µs conversion time, single +5 V supply operation, and on-chip track/hold amplifier. It accepts 0 V to +2.5 V unipolar input range, delivers straight binary output coding, and is housed in an 8-pin SOIC package for space-constrained data acquisition systems in industrial instrumentation.
For engineers reviewing the AD7893AR-2 datasheet, AD7893AR-2 pinout, AD7893AR-2 application, or AD7893AR-2 equivalent, this page provides verified technical context, real-world timing constraints, confirmed analog input behavior, and validated alternative options for precision unipolar ADC selection.
Technical Context
The AD7893AR-2 implements a successive-approximation architecture with internal laser-trimmed clock oscillator and buffered reference input (REF IN), enabling fully self-contained conversion without external timing components. Its track/hold acquisition time is 1.5 µs, and aperture delay is 15 ns - critical for accurate sampling of fast-changing signals up to ~58 kHz.
Conversion is initiated by a rising edge on CONVST; serial data is clocked out via SCLK/SDATA two-wire interface with 16-bit frame (4 leading zeros + 12-bit result), valid on SCLK falling edges. No BUSY or EOC signal is provided - timing coordination must be handled externally using CONVST edge or fixed delays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes over full operating range |
| Conversion Time | 6 µs max - defines minimum inter-conversion interval for 117 kHz throughput |
| Analog Input Range | 0 V to +2.5 V - requires external +2.5 V reference; high-impedance VIN input draws <500 nA |
| Output Coding | Straight (natural) binary - simplifies firmware decoding vs. two's complement |
| Signal-to-(Noise+Distortion) | 70 dB min at 10 kHz - confirms usable dynamic range for medium-bandwidth sensor signals |
| Power Dissipation | 25 mW typical - enables battery-powered or thermally constrained designs |
| Relative Accuracy | ±1 LSB max - ensures monotonicity and predictable linearity error in closed-loop control |
Pinout & Package
AD7893AR-2 is supplied in an 8-pin Small Outline IC (SOIC) package, 0.154" wide body, with standard SO-8 footprint and gull-wing leads. Pin 1 is marked by notch or dot; pins are numbered counterclockwise from top-left corner when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Buffered +2.5 V reference input; gain/offset errors scale with reference accuracy |
| 2 - VIN | Analog input channel | High-impedance unipolar input (0 V to +2.5 V); no dynamic charging current |
| 3 - AGND | Analog ground reference | Separate ground return for track/hold, comparator, and DAC - must be isolated from DGND |
| 4 - SCLK | Serial clock input | External clock driving serial read; rising edge clocks data out, falling edge validates data |
| 5 - SDATA | Serial data output | Three-state output delivering 16-bit frame (4 zeros + 12-bit result); disabled after 16th falling edge |
| 6 - DGND | Digital ground reference | Ground return for logic circuitry; must be connected to system digital ground plane |
| 7 - CONVST | Convert start input | Edge-triggered control: rising edge initiates conversion and hold; falling edge resets shift register |
| 8 - VDD | Positive supply | +5 V ±5% supply; powers all analog and digital sections; IDD ≤ 9 mA max |
Key Features
| Feature | Design Value |
|---|---|
| On-chip track/hold amplifier | Enables accurate sampling of full-scale sine waves up to ~58 kHz without external components |
| Single-supply +5 V operation | Eliminates need for dual-rail supplies or level-shifting in portable or embedded systems |
| High-speed serial interface | Two-wire (SCLK/SDATA) reduces PCB routing complexity and microcontroller pin count |
| LC2MOS process technology | Combines bipolar precision with CMOS low power - achieves 25 mW typical dissipation |
| 8-pin SOIC packaging | Minimizes board area vs. multi-chip alternatives while maintaining thermal performance (θJA = 170°C/W) |
Applications
| Industrial Process Monitoring | Portable Data Loggers |
|---|---|
Use Scenario: Continuous voltage monitoring of 0–2.5 V sensor outputs (e.g., RTD transmitters, pressure bridges) in factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: Precision unipolar ADC capturing analog sensor data at up to 117 kHz with minimal latency and deterministic timing. Use Value: Enables direct digitization of calibrated 0–2.5 V industrial signals without scaling resistors or op-amp buffers - reducing BOM cost and calibration drift. | Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and light intensity over extended periods. IC Role / Device Role / Timing Role: Low-power ADC performing periodic conversions triggered by MCU timer, with serial data read during sleep wake-up cycles. Use Value: 25 mW typical power and single +5 V supply allow integration into compact, long-life battery systems without DC-DC conversion overhead. |
| Medical Instrumentation Front-End | Test & Measurement Equipment |
Use Scenario: Signal conditioning stage in handheld ECG or pulse oximeter devices measuring amplified biopotential waveforms. IC Role / Device Role / Timing Role: High-fidelity ADC acquiring clean, low-noise analog signals with 70 dB SNR and <1.5 µs track/hold acquisition. Use Value: On-chip track/hold eliminates external sample-hold circuitry, preserving signal integrity and reducing layout sensitivity to noise coupling. | Use Scenario: Embedded digitizer in benchtop multimeters or oscilloscope auxiliary channels requiring moderate speed and resolution. IC Role / Device Role / Timing Role: Serial-output ADC interfacing directly to FPGA or ARM-based controller via GPIO bit-banged SCLK/SDATA. Use Value: Straight binary coding and deterministic 6 µs conversion simplify firmware implementation and reduce CPU overhead versus parallel-interface ADCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unipolar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7893BR-2 | ±1/2 LSB relative accuracy (vs. ±1 LSB), 72 dB SNR (vs. 70 dB), same SO-8 package and pinout | Higher precision required in metrology-grade or calibration-critical systems | Select AD7893BR-2 when tighter linearity and improved dynamic range justify cost premium |
| ADS7822U | 12-bit, SPI-compatible, 2.7–5.25 V supply, 10 µs conversion, no on-chip track/hold | Lower power (1.25 mW), wider supply range, but requires external track/hold for AC signals | Choose ADS7822U for ultra-low-power or wide-voltage applications where external signal conditioning is acceptable |
Compared with AD7893BR-2, the AD7893AR-2 trades 0.5 LSB linearity and 2 dB SNR for lower cost and sufficient accuracy in general-purpose industrial sensing; compared with ADS7822U, it integrates track/hold and guarantees 0–2.5 V unipolar performance without external components, at higher power and fixed +5 V supply.
Availability
AD7893AR-2 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, medical instrumentation front-end, and test & measurement equipment requiring stable component supply across production lifecycles.
Supply support for AD7893AR-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD7893 product line delivers compact, single-supply, serial-output ADCs optimized for space- and power-constrained data acquisition in industrial, medical, and instrumentation systems - emphasizing integration, ease of interface, and guaranteed dc/dynamic performance.
FAQ
What is the reference voltage requirement for AD7893AR-2?
The AD7893AR-2 requires an external +2.5 V reference applied to the REF IN pin. The part specifies ±5% tolerance (2.375 V to 2.625 V), and reference accuracy directly impacts full-scale and gain errors. Recommended sources include the AD780 or AD680 precision references. The AD7893AR-2 does not generate its own reference and cannot operate without this external input.
Does AD7893AR-2 include an on-chip track/hold amplifier?
Yes, the AD7893AR-2 integrates a track/hold amplifier optimized for 12-bit accuracy. It acquires input signals to within ±1/2 LSB in ≤1.5 µs and supports input frequencies up to ~58 kHz. This eliminates the need for external sample-and-hold circuitry in most unipolar 0–2.5 V applications, simplifying design and improving signal fidelity.
What is the output data format of AD7893AR-2?
The AD7893AR-2 outputs straight (natural) binary coding - not two's complement - because it is configured for unipolar 0 V to +2.5 V input range. The serial frame consists of 16 bits: four leading zeros followed by the 12-bit conversion result, with DB11 (MSB) first and DB0 (LSB) last. Data is valid on the falling edge of SCLK.
Can AD7893AR-2 operate from a supply other than +5 V?
No - the AD7893AR-2 is specified only for +5 V ±5% (4.75 V to 5.25 V) operation. Its internal clock oscillator, track/hold amplifier, and reference buffer are designed for this voltage. Operation outside this range may cause timing violations, reduced SNR, or functional failure. It is not compatible with 3.3 V or dual-supply configurations.
How is conversion timing controlled on AD7893AR-2?
Conversion is initiated by a rising edge on the CONVST pin. The AD7893AR-2 completes conversion in 6 µs and returns to track mode. To meet datasheet specifications, the serial read must avoid occurring during conversion or within 600 ns before the next CONVST rising edge. Software delay or CONVST-edge interrupt schemes are used - no dedicated BUSY or EOC pin is provided.
AD7893AR-2 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):
- 117k
- 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:
- -
AD7893AR-2 FAQ
1.How can I place an order for AD7893AR-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7893AR-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 AD7893AR-2 reliable?
The price and inventory of AD7893AR-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7893AR-2 is usually 5 days.
3.What payment methods are accepted for AD7893AR-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7893AR-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7893AR-2?
AD7893AR-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7893AR-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 AD7893AR-2?
For technical support, including AD7893AR-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7893AR-2 requirements.
6.How does Aetrix verify that AD7893AR-2 is sourced from the original manufacturer or authorized distributors?
All AD7893AR-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 AD7893AR-2 meets industry standards.
7.What is the process for return or replacement of AD7893AR-2?
All AD7893AR-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7893AR-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 AD7893AR-2 part is unused and in its original packaging.
Return procedure for AD7893AR-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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