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Analog Devices Inc. AD7893AR-3
- Part No.:
- AD7893AR-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7893AR-3.pdf
- Description:
- IC ADC 12BIT SRL T/H LP 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:11,423
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Product details
Overview
AD7893AR-3 from Analog Devices is a 12-bit successive-approximation ADC with ±2.5 V analog input range, 6 µs conversion time, on-chip track/hold amplifier, and high-speed two-wire serial interface (SCLK/SDATA), operating from a single +5 V supply in an 8-pin SOIC package for precision data acquisition in industrial sensor interfaces.
For engineers reviewing the AD7893AR-3 datasheet, AD7893AR-3 pinout, AD7893AR-3 application, or AD7893AR-3 equivalent, this page delivers verified technical context, real-world timing constraints, input resistance (4 kΩ min), output coding (two's complement), and selection guidance against functionally aligned alternatives.
Technical Context
The AD7893AR-3 implements a laser-trimmed internal clock driving a 12-bit R-2R ladder SAR core, with integrated track/hold acquiring to ±1/2 LSB in ≤1.5 µs. Its analog front-end scales ±2.5 V inputs using on-chip resistor networks (R1 = R2 = 6.5 kΩ), while REF IN accepts a buffered +2.5 V ±5% reference.
Serial communication uses edge-triggered SCLK rising-edge sampling and falling-edge data validity, delivering 16-bit frames (4 leading zeros + 12-bit two's complement result). No BUSY or EOC signal is provided-timing coordination relies strictly on CONVST edge control and fixed 6 µs conversion latency.
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 | ±2.5 V - sets full-scale voltage for bipolar signal conditioning |
| Input Resistance | 4 kΩ min - determines loading effect on source impedance in signal chain |
| Reference Input | +2.5 V ±5% - required external reference voltage for accurate gain calibration |
| Output Coding | Two's complement - enables direct signed arithmetic without software conversion |
| Power Dissipation | 25 mW typical - supports battery-powered or thermally constrained designs |
Pinout & Package
AD7893AR-3 is housed in an 8-pin SOIC (SO-8) package with 1.27 mm pitch, 5.0 mm × 6.2 mm body, and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage Reference Input | Buffered +2.5 V reference input; max 1 µA current; deviation directly impacts full-scale error |
| 2 - VIN | Analog Input Channel | ±2.5 V bipolar input node; 4 kΩ min input resistance; connects to internal scaling resistors |
| 3 - AGND | Analog Ground | Separate ground return for track/hold, comparator, and DAC; must be isolated from DGND |
| 4 - SCLK | Serial Clock Input | External clock controlling 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 two's complement); disabled after 16th falling edge |
| 6 - DGND | Digital Ground | Ground reference for logic circuitry; must be connected to system digital ground plane |
| 7 - CONVST | Convert Start | Falling edge resets serial counter; rising edge initiates track-to-hold transition and conversion |
| 8 - VDD | Positive Supply | +5 V ±5% supply; powers analog and digital sections; max 9 mA IDD |
Key Features
| Feature | Design Value |
|---|---|
| Single +5 V operation | Eliminates dual-supply design complexity and reduces BOM count in portable instrumentation |
| On-chip track/hold amplifier | Enables accurate digitization of full-scale sine waves up to 58 kHz without external components |
| High-speed serial interface | Two-wire (SCLK/SDATA) interface minimizes PCB routing and GPIO usage on microcontrollers |
| LC2MOS process technology | Combines bipolar precision with CMOS low power, achieving 70 dB SNR at 10 kHz input |
| 8-pin SOIC packaging | Reduces board area by >50% vs. legacy 16-pin ADC solutions while maintaining thermal performance |
Applications
| Industrial Sensor Signal Conditioning | Portable Data Loggers |
|---|---|
Use Scenario: Digitizing ±2.5 V outputs from strain-gauge bridges or RTD transmitters in factory-floor PLC I/O modules. IC Role / Device Role / Timing Role: ADC front-end performing bipolar sampling with 12-bit resolution and 117 kHz sustained rate. Use Value: Eliminates external op-amp scaling and reference buffering; 4 kΩ input resistance matches typical bridge output impedances. | Use Scenario: Battery-powered environmental monitors capturing temperature, humidity, and pressure with low standby current. IC Role / Device Role / Timing Role: Low-power 12-bit converter enabling 25 mW typical operation and deterministic 6 µs conversion latency. Use Value: Single +5 V supply and SOIC footprint reduce PCB size and power management complexity. |
| Test & Measurement Front Ends | Motor Control Current Sensing |
Use Scenario: Capturing transient waveforms in handheld oscilloscopes or benchtop DMMs requiring DC accuracy and dynamic linearity. IC Role / Device Role / Timing Role: Precision SAR ADC delivering ±1 LSB relative accuracy and 70 dB SNR at 10 kHz. Use Value: On-chip track/hold acquisition time ≤1.5 µs ensures fidelity across fast-rising edges without external hold capacitor. | Use Scenario: Sampling shunt-voltage feedback in servo drives where bidirectional current sensing requires bipolar input range. IC Role / Device Role / Timing Role: Bipolar ADC converting ±2.5 V shunt signals into two's complement format for direct DSP processing. Use Value: Two's complement output avoids sign-extension overhead in real-time motor algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7893BR-3 | ±1/2 LSB relative accuracy (vs. ±1 LSB for AD7893AR-3); same SO-8 package and timing | Higher DC precision required in calibration-grade instrumentation | Select AD7893BR-3 when endpoint nonlinearity must be halved without changing layout or firmware |
| ADS7822U | 2.7–5.25 V supply range; SPI-compatible 4-wire interface; no internal track/hold | Lower-voltage systems or designs needing dedicated CS/DRDY signaling | Choose ADS7822U only if supply flexibility or status signaling outweighs loss of integrated track/hold and increased pin count |
Compared with AD7893BR-3, the AD7893AR-3 trades 0.5 LSB linearity for cost-sensitive production; versus ADS7822U, it retains space-saving 2-wire serial operation and eliminates external track/hold but requires strict CONVST-synchronized timing.
Availability
AD7893AR-3 is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable data loggers, test equipment front ends, and motor control current sensing requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for AD7893AR-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 is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies.
The AD7893 product line delivers compact, single-supply 12-bit SAR ADCs with integrated track/hold and serial interfaces for space-constrained, precision data acquisition systems.
FAQ
What is the input resistance of the AD7893AR-3 analog input?
The AD7893AR-3 has a minimum input resistance of 4 kΩ at the VIN pin, as specified for the ±2.5 V input range variant. This value reflects the effective resistance presented to the signal source due to internal scaling resistors and is critical for minimizing loading errors in high-impedance sensor circuits. The AD7893AR-3 datasheet confirms this parameter under "ANALOG INPUT" specifications.
Does the AD7893AR-3 require an external reference voltage?
Yes, the AD7893AR-3 requires an external +2.5 V reference applied to the REF IN pin, with tolerance of ±5%. The reference is internally buffered, drawing ≤1 µA, and directly determines full-scale accuracy. Using a precision source like the AD780 ensures the AD7893AR-3 meets its ±1 LSB relative accuracy specification across temperature.
What is the output coding format of the AD7893AR-3?
The AD7893AR-3 uses two's complement coding for its 12-bit conversion result, as confirmed in both the "LOGIC OUTPUTS" section and "CIRCUIT DESCRIPTION" of the datasheet. This format applies specifically to the AD7893-3 variant and enables direct interpretation of negative values without software sign extension, simplifying bipolar signal processing in the AD7893AR-3.
Can the AD7893AR-3 operate at throughput rates higher than 117 kHz?
Yes, the AD7893AR-3 can achieve up to 133 kHz throughput by reading data during conversion, but this degrades dynamic performance: SNR drops ~1.5 dB and code flicker increases. For guaranteed 70 dB SNR and ±1 LSB linearity, the AD7893AR-3 must be operated at ≤117 kHz with read operations scheduled ≥6 µs after CONVST rising edge and ending ≥600 ns before the next CONVST rising edge.
Is the AD7893AR-3 pin-compatible with other AD7893 variants in SOIC packages?
Yes, all AD7893 SOIC variants-including AD7893AR-2, AD7893AR-5, and AD7893AR-10-share identical SO-8 pinouts and mechanical footprints. However, input ranges, output coding (straight binary vs. two's complement), and internal resistor networks differ; thus, substituting AD7893AR-3 for another variant requires verifying reference voltage, signal scaling, and firmware handling of output format.
AD7893AR-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 117k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- 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:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7893AR-3 FAQ
1.How can I place an order for AD7893AR-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7893AR-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 AD7893AR-3 reliable?
The price and inventory of AD7893AR-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7893AR-3 is usually 5 days.
3.What payment methods are accepted for AD7893AR-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7893AR-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7893AR-3?
AD7893AR-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7893AR-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 AD7893AR-3?
For technical support, including AD7893AR-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7893AR-3 requirements.
6.How does Aetrix verify that AD7893AR-3 is sourced from the original manufacturer or authorized distributors?
All AD7893AR-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 AD7893AR-3 meets industry standards.
7.What is the process for return or replacement of AD7893AR-3?
All AD7893AR-3 units undergo pre-shipment inspection (PSI). If there is an issue with AD7893AR-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 AD7893AR-3 part is unused and in its original packaging.
Return procedure for AD7893AR-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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