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Analog Devices Inc. AD7893BN-10
- Part No.:
- AD7893BN-10
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7893BN-10.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,557
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Product details
Overview
AD7893BN-10 from Analog Devices is a 12-bit, serial-output analog-to-digital converter with ±10 V input range, 6 µs conversion time, and on-chip track/hold amplifier, operating from a single +5 V supply in an 8-pin plastic DIP package. It delivers 72 dB SNR and ±0.5 LSB relative accuracy for precision data acquisition in industrial control and test instrumentation.
For engineers reviewing the AD7893BN-10 datasheet, AD7893BN-10 pinout, AD7893BN-10 application, or AD7893BN-10 equivalent, this page provides verified technical context, real-world timing constraints, input scaling behavior, serial interface timing margins, and validated alternative options for bipolar ±10 V signal digitization.
Technical Context
The AD7893BN-10 implements a successive-approximation ADC core with an R-2R ladder DAC and laser-trimmed internal clock oscillator, eliminating external timing components. Its on-chip track/hold acquires to ±0.5 LSB in ≤1.5 µs after conversion completion or input step change.
It uses a two-wire serial interface: SCLK clocks data out on rising edges, SDATA provides 16-bit frames (4 leading zeros + 12-bit twos-complement result), with data valid on falling SCLK edges and automatic three-state disable after the 16th falling edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes over full input range |
| Conversion Time | 6 µs max - defines minimum inter-conversion interval for full accuracy |
| Analog Input Range | ±10 V - supports bipolar industrial sensor signals without external scaling |
| Relative Accuracy | ±0.5 LSB max - ensures monotonicity and linearity for closed-loop control |
| Signal-to-(Noise+Distortion) | 72 dB min at 10 kHz - meets high-fidelity waveform capture requirements |
| Power Dissipation | 25 mW typical - enables use in thermally constrained or battery-backed systems |
| Supply Voltage | +5 V ±5% - compatible with standard logic rails and eliminates dual-supply design |
Pinout & Package
AD7893BN-10 is housed in an 8-pin plastic dual-in-line package (N-8), 0.3" wide, with through-hole mounting and industry-standard pin spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Accepts buffered +2.5 V ±5% reference; gain and offset errors scale with reference accuracy |
| 2 - VIN | Analog input channel | ±10 V input range with 16 kΩ min input resistance; internal resistor network enables direct high-voltage interface |
| 3 - AGND | Analog ground reference | Separate ground return for track/hold, comparator, and DAC; must be isolated from DGND at single point |
| 4 - SCLK | Serial clock input | External clock up to 8.33 MHz; rising edge clocks data out, falling edge validates data; must go low post-read |
| 5 - SDATA | Serial data output | 16-bit frame (4 zeros + 12-bit twos-complement); three-stated after 16th falling SCLK edge |
| 6 - DGND | Digital ground reference | Ground return for logic circuitry; separation from AGND reduces digital noise coupling into analog path |
| 7 - CONVST | Convert start trigger | Falling edge resets serial counter; rising edge initiates hold and conversion - no status pin requires timing-synchronized read |
| 8 - VDD | Positive supply | +5 V ±5%; powers all analog and digital sections; 9 mA max IDD supports low-noise decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates need for ±15 V rails while supporting ±10 V analog inputs via internal scaling resistors |
| On-chip track/hold amplifier | Acquires full-scale sine wave inputs to 12-bit accuracy within 1.5 µs, enabling >58 kHz input bandwidth |
| High-speed serial interface | Two-wire (SCLK/SDATA) interface reduces PCB routing complexity and I/O pin count on host microcontrollers |
| LC2MOS process technology | Combines precision bipolar analog front-end with low-power CMOS logic for stable DC and dynamic performance |
| Input voltage protection | Withstands ±17 V on VIN (AD7893BN-10), preventing latch-up or damage during transient overvoltage events |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Continuous digitization of ±10 V outputs from strain-gauge load cells and RTD transmitters in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary ADC capturing sensor data at up to 117 kHz with deterministic 6 µs conversion latency and synchronized serial read timing. Use Value: Enables real-time closed-loop response with <10 µs total latency from analog input to digital output, meeting IEC 61131-3 cycle-time requirements. | Use Scenario: High-accuracy voltage measurement subsystem in benchtop multimeters and functional testers requiring traceable ±10 V full-scale range. IC Role / Device Role / Timing Role: Precision digitizer interfaced to FPGA or microcontroller via fixed-timing serial protocol, delivering calibrated 12-bit results per trigger. Use Value: Delivers 72 dB SNR and ±0.5 LSB linearity without external calibration, reducing system-level test uncertainty and NIST traceability overhead. |
| Medical Instrumentation | Motor Drive Feedback |
Use Scenario: Isolated analog input stage in patient-connected ECG amplifiers digitizing differential lead voltages referenced to ±10 V rails. IC Role / Device Role / Timing Role: Bipolar ADC converting conditioned biopotential signals with twos-complement coding for signed arithmetic in DSP firmware. Use Value: Supports 12-bit resolution across full ±10 V range while consuming only 25 mW, easing thermal management in compact, fanless enclosures. | Use Scenario: Current sensing interface in servo drives digitizing ±10 V outputs from isolated Hall-effect current sensors on motor phases. IC Role / Device Role / Timing Role: Real-time ADC feeding position/velocity control loops with deterministic 6 µs conversion and minimal aperture jitter (<15 ns). Use Value: Ensures phase-aligned sampling across multiple channels, preserving vector control fidelity and reducing torque ripple in PMSM drives. |
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 |
|---|---|---|---|
| AD7893AR-10 | Same architecture and specs, but in 8-pin SOIC package (SO-8); 170°C/W θJA vs. 130°C/W for N-8 | Preferred for surface-mount production and higher-density PCB layouts; less suitable for prototyping or socketed designs | Select AD7893AR-10 when automated assembly and board space are critical; AD7893BN-10 remains optimal for through-hole reliability and thermal margin. |
| ADS7822U | 12-bit, 200 kSPS, SPI-compatible, but unipolar 0–VREF input only; no ±10 V support; requires external reference and level-shifting for bipolar signals | Designed for low-power portable systems; lacks integrated track/hold and input scaling for ±10 V | Choose ADS7822U only if unipolar input range suffices and board area is extremely constrained; AD7893BN-10 provides direct ±10 V interface with no external components. |
Compared with AD7893AR-10 and ADS7822U, AD7893BN-10 uniquely combines ±10 V input capability, through-hole packaging, and on-chip track/hold in a single 8-pin DIP-enabling drop-in replacement in legacy industrial designs without layout or firmware changes.
Availability
AD7893BN-10 is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and medical instrumentation requiring stable component supply, long-term obsolescence planning, and traceable sourcing.
Supply support for AD7893BN-10 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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7893 product line was designed specifically for space-constrained, high-speed data acquisition systems needing single-supply ±10 V digitization without external support circuitry - targeting industrial PLCs, portable instrumentation, and embedded control.
FAQ
What is the maximum input voltage the AD7893BN-10 can withstand without damage?
The AD7893BN-10 has an absolute maximum analog input rating of ±17 V on the VIN pin relative to AGND. This overvoltage tolerance protects against transient spikes in industrial environments, though normal operation is specified for ±10 V. Exceeding ±17 V risks permanent damage per the Absolute Maximum Ratings table.
Does the AD7893BN-10 require an external reference voltage, and what are the specifications?
Yes, the AD7893BN-10 requires an external +2.5 V reference applied to the REF IN pin, with tolerance of ±5% (2.375 V to 2.625 V). The on-chip buffer draws ≤1 µA, and reference inaccuracies directly contribute to gain and offset errors in the AD7893BN-10's transfer function.
How does the serial interface of the AD7893BN-10 handle data framing and timing?
The AD7893BN-10 outputs 16-bit serial frames: four leading zeros followed by the 12-bit twos-complement result (MSB first). Data is clocked out on SCLK rising edges and valid on falling edges. After the 16th falling SCLK edge, SDATA enters high-impedance state - requiring SCLK to return low before next CONVST pulse.
Can the AD7893BN-10 be used with microcontrollers lacking dedicated SPI hardware?
Yes - the AD7893BN-10's two-wire serial interface (SCLK and SDATA) is bit-bang friendly. Its timing allows software-controlled GPIO toggling: minimum SCLK high/low pulses are 60 ns/30 ns, and data setup/hold margins exceed 50 ns, making it compatible with most 8–32-bit MCUs running at ≥10 MHz.
What is the role of the CONVST signal beyond initiating conversion in the AD7893BN-10?
In the AD7893BN-10, the CONVST signal serves dual roles: its rising edge triggers hold mode and conversion start, while its falling edge resets the internal serial output shift register. This ensures deterministic state recovery each cycle - critical because the part lacks a BUSY or EOC status pin.
AD7893BN-10 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:
- -
AD7893BN-10 FAQ
1.How can I place an order for AD7893BN-10 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7893BN-10 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 AD7893BN-10 reliable?
The price and inventory of AD7893BN-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7893BN-10 is usually 5 days.
3.What payment methods are accepted for AD7893BN-10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7893BN-10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7893BN-10?
AD7893BN-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7893BN-10 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 AD7893BN-10?
For technical support, including AD7893BN-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7893BN-10 requirements.
6.How does Aetrix verify that AD7893BN-10 is sourced from the original manufacturer or authorized distributors?
All AD7893BN-10 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 AD7893BN-10 meets industry standards.
7.What is the process for return or replacement of AD7893BN-10?
All AD7893BN-10 units undergo pre-shipment inspection (PSI). If there is an issue with AD7893BN-10, 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 AD7893BN-10 part is unused and in its original packaging.
Return procedure for AD7893BN-10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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