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Analog Devices Inc. AD7893SQ-5
- Part No.:
- AD7893SQ-5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD7893SQ-5.pdf
- Description:
- IC ADC 12BIT SAR 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,785
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Product details
Overview
AD7893SQ-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), and is qualified for extended temperature operation from –55°C to +125°C in a hermetic Cerdip package. It is used in precision data acquisition systems requiring fast sampling and low power in harsh environments.
For engineers reviewing the AD7893SQ-5 datasheet, AD7893SQ-5 pinout, AD7893SQ-5 application, or AD7893SQ-5 equivalent, key selection considerations include its 0 V to +5 V input range, straight binary output coding, ±1 LSB relative accuracy, 70 dB SNR at 10 kHz, and timing-critical serial read protocol requiring 16 SCLK edges per conversion.
Technical Context
The AD7893SQ-5 implements a successive-approximation ADC core based on an R-2R ladder structure, paired with an on-chip track/hold amplifier that acquires to ±1/2 LSB in ≤1.5 µs. Its internal laser-trimmed oscillator eliminates external clock components, enabling deterministic 6 µs conversion time independent of system clock.
It uses a two-wire serial interface: SDATA outputs 16 bits per conversion (4 leading zeros + 12-bit result, MSB-first), valid on the falling edge of SCLK, with no busy or ready status signal - requiring precise timing coordination between CONVST edge and SCLK sequence to avoid invalid reads or bus contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes; supports 4096 discrete digital levels over full-scale range. |
| Conversion Time | 6 µs max - defines minimum inter-conversion interval for full accuracy; enables up to 117 kHz sustained throughput. |
| Analog Input Range | 0 V to +5 V - unipolar range optimized for single-supply sensor interfaces and industrial control signals referenced to ground. |
| Output Coding | Straight (natural) binary - simplifies firmware interpretation; LSB = 1.22 mV with 2.5 V reference. |
| Signal-to-(Noise+Distortion) | 70 dB min at fIN = 10 kHz - ensures usable dynamic range for medium-bandwidth instrumentation signals. |
| Relative Accuracy | ±1 LSB max - limits end-point nonlinearity error to ≤0.024% of full scale, critical for calibration-sensitive applications. |
| Power Dissipation | 25 mW typical - enables battery-powered or thermally constrained embedded designs without active cooling. |
Pinout & Package
AD7893SQ-5 is housed in an 8-pin hermetic Cerdip (Q-8) package, 0.3" wide, rated for –55°C to +125°C operation. Pin layout matches standard 8-pin DIP footprint with 0.3" row spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Accepts buffered +2.5 V ±5% external reference; errors directly scale full-scale gain and affect offset in unipolar mode. |
| 2 - VIN | Analog input channel | 0 V to +5 V unipolar input; high-impedance stage minimizes dynamic charging current during sampling. |
| 3 - AGND | Analog ground reference | Separate ground return for track/hold, comparator, and DAC; must be star-connected to minimize noise coupling. |
| 4 - SCLK | Serial clock input | External clock driving serial read; rising edge clocks data out, falling edge validates; max frequency 8.33 MHz. |
| 5 - SDATA | Serial data output | Three-state output providing 16-bit frame (4 zeros + 12-bit result); disabled after 16th falling SCLK edge. |
| 6 - DGND | Digital ground reference | Isolated ground for logic circuitry; must be connected to AGND at single point to prevent ground loops. |
| 7 - CONVST | Convert start input | Falling edge resets serial counter; rising edge initiates track→hold transition and starts 6 µs conversion. |
| 8 - VDD | Positive supply | +5 V ±5% supply; powers analog and digital sections; typical IDD = 9 mA, max 45 mW dissipation. |
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 and simplifies anti-aliasing filter design. |
| Internal clock generation | Laser-trimmed oscillator provides fixed 6 µs conversion time - removes dependency on external clock stability or routing. |
| Two-wire serial interface | SCLK + SDATA only - reduces PCB trace count and microcontroller GPIO usage; compatible with most SPI-capable processors. |
| Hermetic Cerdip packaging | Q-8 package rated for –55°C to +125°C - ensures long-term reliability in aerospace, downhole, and military systems. |
| Unipolar 0 V to +5 V input | No level-shifting required for standard industrial voltage outputs - simplifies front-end conditioning and improves noise immunity. |
Applications
| Industrial Process Monitoring | Aerospace Sensor Interface |
|---|---|
Use Scenario: Continuous digitization of 4–20 mA loop outputs converted to 0–5 V via precision shunt in turbine control cabinets. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor feedback at 100 kHz with deterministic latency for closed-loop actuator control. Use Value: 6 µs conversion + 1.5 µs track/hold acquisition enables tight control loop timing; hermetic Q-8 package withstands vibration and thermal cycling. |
Use Scenario: Digitizing strain gauge and RTD outputs in flight control surface electronics exposed to extreme temperature gradients. IC Role / Device Role / Timing Role: High-reliability ADC interfacing with ratiometric bridge sensors, operating across –55°C to +125°C without recalibration. Use Value: ±1 LSB linearity and 70 dB SNR preserve measurement fidelity; Cerdip package prevents moisture ingress and parameter drift. |
| Portable Test Equipment | Energy Metering Front-End |
Use Scenario: Battery-powered handheld multimeter acquiring AC/DC voltage and current with auto-ranging and true RMS calculation. IC Role / Device Role / Timing Role: Low-power ADC handling multiple input ranges via external scaling, synchronized to internal 6 µs conversion cycle. Use Value: 25 mW typical power enables >8-hour operation on AA cells; straight binary output accelerates firmware math operations. |
Use Scenario: Sampling isolated voltage and current waveforms in Class 0.5 smart electricity meters using isolation amplifiers and shunts. IC Role / Device Role / Timing Role: Precision ADC digitizing conditioned 0–5 V metering signals at ≥8 kHz for harmonic analysis and energy accumulation. Use Value: 70 dB SNR meets IEC 62053-22 requirements for harmonic distortion; 0 V to +5 V input aligns with industry-standard signal conditioning stages. |
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-5 | SOIC-8 package, –40°C to +85°C rating, ±1/2 LSB relative accuracy (vs. ±1 LSB) | Commercial-temperature industrial controls where extended temp range is not required | Select for cost-sensitive volume production with standard reflow assembly and lower accuracy tolerance. |
| ADS7822U | 12-bit, 200 kSPS, SPI-compatible, +2.7 V to +5.25 V supply, no internal track/hold | Low-voltage portable systems needing higher speed and wider supply range | Select when operating below +5 V or requiring >117 kSPS; requires external THA and reference buffering. |
Compared with AD7893BR-5, AD7893SQ-5 trades ±1/2 LSB accuracy for extended temperature capability and hermetic reliability; compared with ADS7822U, it offers integrated track/hold and deterministic 6 µs timing but at lower maximum sample rate and fixed +5 V supply.
Availability
AD7893SQ-5 is available at Aetrix Electronics and suitable for industrial process monitoring, aerospace sensor interface, portable test equipment, and energy metering front-end applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AD7893SQ-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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement and control.
The AD7893 family was designed as a space-optimized, single-supply 12-bit serial ADC solution for embedded data acquisition in resource-constrained and high-reliability systems - emphasizing integration, timing determinism, and rugged packaging.
FAQ
What is the input voltage range supported by the AD7893SQ-5?
The AD7893SQ-5 supports a unipolar analog input range of 0 V to +5 V. This is fixed for the -5 variant and does not support bipolar or other ranges. The input resistance is 9 kΩ minimum, and the input stage is designed to be benign with minimal dynamic charging current, making it compatible with standard op-amp buffers and resistive sensor interfaces without additional signal conditioning.
Does the AD7893SQ-5 require an external reference voltage?
Yes, the AD7893SQ-5 requires an external +2.5 V reference applied to the REF IN pin. The internal reference buffer accepts 2.375 V to 2.625 V, and reference accuracy directly impacts gain and full-scale error. Recommended sources include the AD780 or AD680 precision references. The AD7893SQ-5 does not contain an internal reference and will not operate correctly without this external 2.5 V source.
How is serial data formatted and timed on the AD7893SQ-5?
The AD7893SQ-5 outputs 16 bits per conversion on SDATA: four leading zeros followed by the 12-bit straight binary result (MSB first). Data is clocked out on the rising edge of SCLK and is valid on the falling edge. Exactly 16 SCLK pulses are required; on the 16th falling edge, SDATA goes three-state. Reading outside this window or straddling CONVST edges results in invalid data.
What is the significance of the "SQ" suffix in AD7893SQ-5?
The "SQ" in AD7893SQ-5 denotes the Cerdip (ceramic dual-in-line) package with extended temperature range (–55°C to +125°C) and screening for high-reliability applications. It differentiates the part from plastic DIP (AN/BN) and SOIC (AR/BR) variants. The SQ version is hermetically sealed, offering superior moisture resistance, thermal stability, and long-term parameter retention in demanding environments.
Can the AD7893SQ-5 operate without an external track/hold amplifier?
Yes - the AD7893SQ-5 includes a fully integrated on-chip track/hold amplifier optimized for 12-bit accuracy. No external THA is required. The track/hold acquires to ±1/2 LSB in ≤1.5 µs and transitions automatically on the rising edge of CONVST. Its bandwidth exceeds 58 kHz, supporting full-scale sine wave inputs at the device's maximum 117 kHz throughput rate.
AD7893SQ-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- -55°C ~ 125°C
- Supplier Device Package:
- 8-CERDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7893SQ-5 FAQ
1.How can I place an order for AD7893SQ-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7893SQ-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 AD7893SQ-5 reliable?
The price and inventory of AD7893SQ-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7893SQ-5 is usually 5 days.
3.What payment methods are accepted for AD7893SQ-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7893SQ-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7893SQ-5?
AD7893SQ-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7893SQ-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 AD7893SQ-5?
For technical support, including AD7893SQ-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7893SQ-5 requirements.
6.How does Aetrix verify that AD7893SQ-5 is sourced from the original manufacturer or authorized distributors?
All AD7893SQ-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 AD7893SQ-5 meets industry standards.
7.What is the process for return or replacement of AD7893SQ-5?
All AD7893SQ-5 units undergo pre-shipment inspection (PSI). If there is an issue with AD7893SQ-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 AD7893SQ-5 part is unused and in its original packaging.
Return procedure for AD7893SQ-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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