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Analog Devices Inc. AD7893AN-5
- Part No.:
- AD7893AN-5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7893AN-5.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,541
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Product details
Overview
AD7893AN-5 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 0 V to +5 V unipolar input range. It integrates an on-chip track/hold amplifier, internal clock, and high-speed two-wire serial interface (SCLK/SDATA), enabling compact data acquisition in industrial sensor interfaces and embedded control systems.
For engineers reviewing the AD7893AN-5 datasheet, AD7893AN-5 pinout, AD7893AN-5 application, or AD7893AN-5 equivalent, this page delivers verified technical context, real-world timing constraints, unipolar straight-binary coding behavior, and validated alternative options for precision 12-bit sampling at up to 117 kHz throughput.
Technical Context
The AD7893AN-5 implements a successive-approximation ADC core with R-2R ladder architecture and laser-trimmed internal clock, delivering 6 µs conversion time and 1.5 µs track/hold acquisition. Its analog front-end uses resistor-scaling networks to support 0 V to +5 V input range with 9 kΩ input resistance and buffered 2.5 V reference input.
Timing-critical operation requires strict sequencing: CONVST rising edge initiates hold and conversion; SDATA outputs 16-bit frame (4 leading zeros + 12-bit straight binary) synchronized to SCLK rising edges, with data valid on falling edges; read must avoid 600 ns before next CONVST rising edge to meet 70 dB SNR and ±1 LSB relative accuracy specs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes over full scale |
| Conversion Time | 6 µs max - enables maximum 117 kHz sampling rate with proper timing margin |
| Analog Input Range | 0 V to +5 V - unipolar straight-binary output coding, optimized for single-supply systems |
| Reference Input | +2.5 V ±5% - buffered on-chip; external precision source required (e.g., AD780) |
| Power Dissipation | 25 mW typical - supports battery-powered or thermally constrained designs |
| Signal-to-(Noise+Distortion) | 70 dB min @ 10 kHz - meets industrial measurement fidelity requirements |
| Relative Accuracy | ±1 LSB max - ensures endpoint linearity without calibration in most applications |
Pinout & Package
AD7893AN-5 is housed in an 8-pin plastic mini-DIP (N-8) package, 0.3" wide, with through-hole mounting compatibility and 130°C/W thermal impedance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage Reference Input | Accepts buffered +2.5 V ±5% external reference; gain and offset errors scale with reference accuracy |
| 2 - VIN | Analog Input Channel | 0 V to +5 V unipolar input; 9 kΩ input resistance; no dynamic charging current due to high-Z track/hold stage |
| 3 - AGND | Analog Ground | 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 out SDATA bit; falling edge validates data |
| 5 - SDATA | Serial Data Output | 16-bit frame (4 zeros + 12-bit straight binary MSB-first); three-stated after 16th falling SCLK edge |
| 6 - DGND | Digital Ground | Ground reference for logic circuitry; separation from AGND reduces digital noise coupling into analog path |
| 7 - CONVST | Convert Start | Falling edge resets serial counter; rising edge triggers track→hold transition and starts conversion |
| 8 - VDD | Positive Supply | +5 V ±5%; powers all analog and digital sections; 9 mA max IDD supports low-power system design |
Key Features
| Feature | Design Value |
|---|---|
| On-chip track/hold amplifier | Acquires input to 12-bit accuracy in ≤1.5 µs; eliminates need for external THA in most 10 kHz bandwidth applications |
| High-speed serial interface | Two-wire (SCLK/SDATA) interface reduces PCB routing complexity and I/O pin count vs parallel ADCs |
| Single +5 V supply operation | Eliminates dual-rail power design; 25 mW typical dissipation enables portable and space-constrained deployments |
| LC2MOS process technology | Combines bipolar precision with CMOS logic density-enables full 12-bit ADC + interface in 8-pin DIP |
| Unipolar straight-binary coding | Outputs 0x000–0xFFF for 0 V to +5 V input; simplifies firmware math vs two's complement in microcontroller-based systems |
Applications
| Industrial Process Monitoring | Portable Data Loggers |
|---|---|
Use Scenario: Continuous voltage monitoring of 4–20 mA loop transmitters via precision shunt resistor. IC Role / Device Role / Timing Role: ADC digitizes conditioned 0–5 V signals at 10–100 kHz rates; CONVST-driven timing ensures deterministic sampling aligned to control cycles. Use Value: 12-bit resolution and 70 dB SNR capture subtle drift in sensor outputs; 6 µs conversion enables oversampling for effective noise reduction. | Use Scenario: Battery-powered environmental sensor node measuring temperature, pressure, and humidity. IC Role / Device Role / Timing Role: ADC samples analog sensor outputs under microcontroller control; low 25 mW power allows >1-year operation on AA cells. Use Value: Single +5 V supply and minimal external components reduce BOM cost and board area; straight-binary output avoids runtime sign-extension overhead. |
| Embedded Motor Control Feedback | Test & Measurement Front-Ends |
Use Scenario: Real-time acquisition of motor phase currents using isolated amplifiers with 0–5 V output. IC Role / Device Role / Timing Role: ADC provides synchronized current samples for field-oriented control algorithms; track/hold holds signal during 6 µs conversion window. Use Value: 1.5 µs track/hold acquisition time supports accurate sampling of fast-rising current transients; ±1 LSB linearity preserves torque control fidelity. | Use Scenario: Modular benchtop instrument capturing transient waveforms with moderate bandwidth requirements. IC Role / Device Role / Timing Role: ADC serves as entry-level digitizer channel; serial interface connects directly to FPGA or ARM Cortex-M SPI peripheral. Use Value: 8-pin DIP footprint simplifies prototyping and socket-based validation; 70 dB SNR supports 10-bit ENOB for general-purpose signal analysis. |
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-5 | Same electrical specs; SOIC-8 package instead of mini-DIP; 170°C/W θJA vs 130°C/W | Better for automated assembly and higher-density PCBs; less suitable for hand-soldered prototypes | Select AR-5 for volume production with reflow capability; AN-5 preferred for lab evaluation and through-hole boards |
| ADS7822U | 12-bit, 200 kSPS, SPI-compatible, +2.7–5.25 V supply; no internal track/hold; requires external sampling control | Higher speed but lacks integrated track/hold; needs external reference and driver for 0–5 V range | Choose ADS7822U when throughput >117 kSPS is critical and board space permits added support components |
Compared with AD7893AR-5, the AD7893AN-5 offers lower thermal resistance for through-hole thermal management; versus ADS7822U, it delivers complete signal chain integration-including track/hold and fixed 0–5 V scaling-at the cost of lower maximum sample rate and inflexible input range.
Availability
AD7893AN-5 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, embedded motor control feedback, and test & measurement front-ends requiring stable component supply and long-term obsolescence planning.
Supply support for AD7893AN-5 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 family was designed specifically for space-constrained, single-supply data acquisition systems needing integrated track/hold, fast 12-bit conversion, and minimal external components-targeting industrial, instrumentation, and portable embedded applications.
FAQ
What is the input voltage range supported by the AD7893AN-5?
The AD7893AN-5 supports a unipolar 0 V to +5 V analog input range. This is fixed per variant and cannot be reconfigured. The input presents 9 kΩ resistance and interfaces directly with the on-chip track/hold amplifier, eliminating dynamic charging current. Operation outside this range risks damage or invalid conversion results, as absolute maximum rating for VIN is –5 V to +10 V only under transient conditions.
Does the AD7893AN-5 require an external voltage reference?
Yes, the AD7893AN-5 requires an external +2.5 V ±5% reference applied to the REF IN pin. The reference input is buffered on-chip with ≤1 µA input current. Precision references such as the AD780 or AD680 are recommended; reference inaccuracies directly contribute to gain and full-scale errors in the AD7893AN-5's transfer function.
What is the output data format of the AD7893AN-5?
The AD7893AN-5 outputs 12-bit straight (natural) binary data, prefixed by four leading zeros for a total 16-bit serial frame. Data is MSB-first, clocked out on SCLK rising edges, and valid on falling edges. This differs from the AD7893-10/AD7893-3 variants, which use two's complement coding. The straight-binary format simplifies firmware interpretation in unipolar measurement applications.
How does the CONVST signal control conversion timing in the AD7893AN-5?
In the AD7893AN-5, the rising edge of CONVST initiates the track-to-hold transition and starts the 6 µs conversion sequence; the falling edge resets the internal serial counter. To ensure valid data, the serial read must complete at least 600 ns before the next CONVST rising edge. Software delays or CONVST-interrupt schemes are commonly used to enforce this timing constraint and maintain 70 dB SNR performance.
Can the AD7893AN-5 operate from a supply voltage other than +5 V?
No-the AD7893AN-5 is specified only for +5 V ±5% (4.75 V to 5.25 V) operation. VDD outside this range violates the Absolute Maximum Rating and may cause functional failure or permanent damage. The internal LC2MOS process, clock oscillator, and reference buffer are all calibrated for nominal +5 V; operation at 3.3 V or other voltages is not supported and will result in undefined behavior or noncompliance with datasheet specifications.
AD7893AN-5 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-5 FAQ
1.How can I place an order for AD7893AN-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7893AN-5 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-5 reliable?
The price and inventory of AD7893AN-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7893AN-5 is usually 5 days.
3.What payment methods are accepted for AD7893AN-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7893AN-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7893AN-5?
AD7893AN-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7893AN-5 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-5?
For technical support, including AD7893AN-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7893AN-5 requirements.
6.How does Aetrix verify that AD7893AN-5 is sourced from the original manufacturer or authorized distributors?
All AD7893AN-5 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-5 meets industry standards.
7.What is the process for return or replacement of AD7893AN-5?
All AD7893AN-5 units undergo pre-shipment inspection (PSI). If there is an issue with AD7893AN-5, 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-5 part is unused and in its original packaging.
Return procedure for AD7893AN-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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