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Analog Devices Inc. AD7893AN-2
- Part No.:
- AD7893AN-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7893AN-2.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,923
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Product details
Overview
AD7893AN-2 from Analog Devices is a 12-bit, single-supply serial analog-to-digital converter with 6 µs conversion time, 0 V to +2.5 V unipolar input range, straight binary output coding, and on-chip track/hold amplifier-designed for compact data acquisition in industrial sensor interfaces and portable instrumentation.
For engineers reviewing the AD7893AN-2 datasheet, AD7893AN-2 pinout, AD7893AN-2 application, or AD7893AN-2 equivalent, this page delivers verified electrical parameters, package mapping (8-pin plastic DIP), timing constraints (tCONV = 6 µs, tACQ = 1.5 µs), reference interface requirements (+2.5 V buffered REF IN), and real-world use context for embedded signal digitization.
Technical Context
The AD7893AN-2 implements a successive-approximation ADC core with R-2R ladder architecture, integrated laser-trimmed internal clock, and on-chip track/hold amplifier optimized for 12-bit accuracy at up to 117 kHz throughput. Its analog front-end accepts only 0 V to +2.5 V inputs with ≤500 nA input current and no external scaling resistors.
Control and data transfer rely exclusively on two-wire serial interface: SCLK (rising-edge clocked, max 8.33 MHz) and SDATA (16-bit frame: four leading zeros + 12-bit MSB-first straight binary). Conversion is edge-triggered via CONVST rising edge; no BUSY or EOC status pin is provided.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes over full scale |
| Conversion Time | 6 µs max - enables 117 kHz maximum sampling rate with proper timing margin |
| Analog Input Range | 0 V to +2.5 V - requires external +2.5 V reference; no input scaling resistors needed |
| Output Coding | Straight (natural) binary - simplifies firmware interpretation vs. two's complement |
| Power Dissipation | 25 mW typical - supports battery-powered operation without thermal derating |
| Signal-to-(Noise+Distortion) | 70 dB min @ 10 kHz - meets precision measurement requirements for sensor signals |
| Relative Accuracy | ±1 LSB max - defines end-point linearity error across full input span |
Pinout & Package
AD7893AN-2 is housed in an 8-pin plastic dual-in-line package (N-8), 0.3" wide, with through-hole mounting and industry-standard pinout compatible with SOIC variant AD7893AR-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Buffered +2.5 V reference input; max 1 µA input current; sets full-scale gain |
| 2 - VIN | Analog input channel | High-impedance input for 0 V to +2.5 V unipolar signals; ≤500 nA bias current |
| 3 - AGND | Analog ground reference | Separate ground return for track/hold, comparator, and DAC sections |
| 4 - SCLK | Serial clock input | External clock source; rising edge clocks out data; falling edge validates data |
| 5 - SDATA | Serial data output | 16-bit frame: four leading zeros + 12-bit MSB-first straight binary; three-stated after 16th falling edge |
| 6 - DGND | Digital ground reference | Isolated ground for digital logic and serial interface circuitry |
| 7 - CONVST | Convert start input | Falling edge resets counter; rising edge initiates track→hold transition and starts conversion |
| 8 - VDD | Positive supply | +5 V ±5% supply; powers entire IC including track/hold, ADC, and serial interface |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Operates from +5 V only - eliminates need for dual-rail supplies in portable systems |
| On-chip track/hold amplifier | Acquires input to 12-bit accuracy in ≤1.5 µs - enables accurate digitization of fast-changing sensor outputs |
| Two-wire serial interface | No parallel bus or control lines required - reduces MCU GPIO count and PCB routing complexity |
| LC2MOS process technology | Combines bipolar precision with CMOS low power - achieves 70 dB SNR at 25 mW |
| 8-pin mini-DIP packaging | 0.3" wide DIP footprint - provides legacy compatibility and hand-soldering capability |
Applications
| Industrial Sensor Interface | Portable Data Logger |
|---|---|
Use Scenario: Digitizing 4–20 mA loop transmitters or thermocouple amplifiers with microcontroller-based PLC modules. IC Role / Device Role / Timing Role: ADC front-end converting conditioned analog sensor outputs into 12-bit digital values synchronized to CONVST pulses. Use Value: 0 V to +2.5 V input range matches common op-amp output rails; straight binary coding avoids sign-extension overhead in firmware. | Use Scenario: Battery-powered environmental monitoring unit acquiring temperature, humidity, and pressure readings at 100 Hz. IC Role / Device Role / Timing Role: Low-power ADC capturing sensor data with minimal active time per sample to extend battery life. Use Value: 25 mW typical power and 6 µs conversion enable >1000 hours runtime on AA cells when paired with sleep-mode MCU. |
| Medical Instrument Front-End | Test & Measurement Equipment |
Use Scenario: Signal conditioning stage in handheld ECG or pulse oximeter devices requiring high DC accuracy and low noise. IC Role / Device Role / Timing Role: Precision digitizer for biopotential amplifiers with calibrated offset and gain stages. Use Value: ±1 LSB relative accuracy and 70 dB SNR meet IEC 60601-2-27 requirements for diagnostic-grade analog acquisition. | Use Scenario: Embedded digitizer in benchtop multimeters or oscilloscope add-on modules. IC Role / Device Role / Timing Role: High-speed serial ADC interfaced to FPGA or ARM Cortex-M4 for real-time waveform capture. Use Value: 117 kHz max throughput and 16-bit serial frame support oversampling and averaging for enhanced resolution. |
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 |
|---|---|---|---|
| AD7893BN-2 | ±1/2 LSB relative accuracy (vs. ±1 LSB), 72 dB SNR (vs. 70 dB), same package and pinout | Higher DC precision required for calibration-critical metrology systems | Select when tighter linearity and improved dynamic performance justify cost premium |
| AD7893AR-2 | SOIC-8 package (vs. PDIP), identical electrical specs and timing, same 0 V to +2.5 V input range | Space-constrained PCB layouts where surface-mount assembly is mandatory | Choose for automated manufacturing or denser board designs without changing firmware or schematic logic |
Compared with AD7893BN-2 and AD7893AR-2, the AD7893AN-2 offers the lowest-cost entry point for 12-bit serial ADC functionality in through-hole designs, trading minor linearity tolerance and SNR for broad availability and ease of prototyping-making it ideal for volume industrial controls where ±1 LSB accuracy suffices.
Availability
AD7893AN-2 is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable data loggers, medical instrument front-ends, and test & measurement equipment requiring stable component supply and long-term production continuity.
Supply support for AD7893AN-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, headquartered in Norwood, MA.
The AD7893 product line delivers compact, single-supply 12-bit serial ADCs for space- and power-constrained embedded systems-designed specifically to replace multi-chip solutions with integrated track/hold, conversion, and serial interface in 8-pin packages.
FAQ
What is the required reference voltage for AD7893AN-2?
The AD7893AN-2 requires a precise +2.5 V reference applied to the REF IN pin. This voltage must be stable and low-noise, as reference errors directly translate to gain errors in the conversion result. The part features an on-chip buffer with ≤1 µA input current, supporting sources like the AD780 or AD680. Operation outside the 2.375 V to 2.625 V range violates specification and degrades linearity and SNR performance of the AD7893AN-2.
Does AD7893AN-2 support bipolar input ranges?
No, the AD7893AN-2 supports only unipolar 0 V to +2.5 V analog input. It is specifically designated as the "-2" variant in the AD7893 family, distinct from the AD7893-10 (±10 V), AD7893-3 (±2.5 V), and AD7893-5 (0 V to +5 V) versions. Its input stage lacks internal scaling resistors and connects directly to the track/hold amplifier, making it incompatible with negative input voltages. Applying voltage below 0 V or above +2.5 V risks violating absolute maximum ratings and may damage the AD7893AN-2.
How is data read from AD7893AN-2?
Data is read via a 16-bit serial frame on the SDATA pin, clocked by SCLK rising edges. The frame consists of four leading zeros followed by the 12-bit conversion result in straight binary format, MSB first. After the 16th falling edge of SCLK, SDATA enters high-impedance (three-state) mode. The AD7893AN-2 does not provide a ready/busy signal, so timing must be managed externally using the known 6 µs conversion time and CONVST edge synchronization to avoid reading during conversion.
What is the maximum recommended sampling rate for AD7893AN-2?
The AD7893AN-2 achieves its full 70 dB SNR and ±1 LSB linearity specifications at a maximum throughput rate of 117 kHz. This requires 6 µs conversion time, 1.92 µs serial read time (16 clocks at 8.33 MHz), and ≥600 ns acquisition margin before the next CONVST rising edge. Attempting higher rates-such as 133 kHz by overlapping read and conversion-degrades SNR by ~1.5 dB and increases code flicker, compromising measurement integrity in precision applications using the AD7893AN-2.
Can AD7893AN-2 operate from a 3.3 V supply?
No, the AD7893AN-2 is specified only for +5 V ±5% (4.75 V to 5.25 V) operation. Its internal LC2MOS process, track/hold amplifier, and reference buffer require this voltage level to meet timing, accuracy, and drive strength specifications. Supplying 3.3 V will prevent proper internal clock generation, cause invalid conversions, and violate absolute maximum ratings for logic thresholds (VINH = 2.4 V min, VOL = 0.4 V max). For 3.3 V systems, consider newer alternatives-not the AD7893AN-2.
AD7893AN-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7893AN-2 FAQ
1.How can I place an order for AD7893AN-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7893AN-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 AD7893AN-2 reliable?
The price and inventory of AD7893AN-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7893AN-2 is usually 5 days.
3.What payment methods are accepted for AD7893AN-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7893AN-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7893AN-2?
AD7893AN-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7893AN-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 AD7893AN-2?
For technical support, including AD7893AN-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7893AN-2 requirements.
6.How does Aetrix verify that AD7893AN-2 is sourced from the original manufacturer or authorized distributors?
All AD7893AN-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 AD7893AN-2 meets industry standards.
7.What is the process for return or replacement of AD7893AN-2?
All AD7893AN-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7893AN-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 AD7893AN-2 part is unused and in its original packaging.
Return procedure for AD7893AN-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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