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Analog Devices Inc. AD7893SQ-2
- Part No.:
- AD7893SQ-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD7893SQ-2.pdf
- Description:
- IC ADC 12BIT SRL T/H LP 8-CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,490
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Product details
Overview
AD7893SQ-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 high-speed data acquisition in space-constrained industrial sensor interfaces.
For engineers reviewing the AD7893SQ-2 datasheet, AD7893SQ-2 pinout, AD7893SQ-2 application, or AD7893SQ-2 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for embedded measurement systems requiring ±1 LSB relative accuracy and 70 dB SNR at 10 kHz.
Technical Context
The AD7893SQ-2 implements a successive-approximation ADC core with an R-2R ladder DAC, integrated laser-trimmed internal clock oscillator, and buffered on-chip track/hold amplifier optimized for 1.5 µs acquisition to ±1/2 LSB. Its serial interface uses two-wire SCLK/SDATA timing with 16-bit frame (4 leading zeros + 12-bit result), valid on SCLK falling edge.
It operates exclusively from a +5 V ±5% supply, accepts a buffered +2.5 V reference (REF IN), and features separate analog (AGND) and digital (DGND) ground pins to minimize noise coupling. Input current is ≤500 nA, enabling direct connection to high-impedance transducer outputs without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes across full operating temperature range (–55°C to +125°C) |
| Conversion Time | 6 µs max - enables up to 117 kHz sustained sampling rate when read timing is synchronized |
| Analog Input Range | 0 V to +2.5 V - unipolar range matched to +2.5 V reference; eliminates need for level-shifting circuitry |
| Relative Accuracy | ±1 LSB max - ensures monotonic transfer function and predictable code transitions in closed-loop control |
| Signal-to-(Noise+Distortion) | 70 dB min at fIN = 10 kHz - supports accurate digitization of audio-band and sensor signals |
| Power Dissipation | 25 mW typical - enables battery-powered or thermally constrained deployments without heatsinking |
| Output Coding | Straight (natural) binary - simplifies firmware parsing versus two's complement; MSB-first, 16-bit frame |
Pinout & Package
AD7893SQ-2 is housed in an 8-pin Cerdip (Q-8) package - hermetically sealed, rated for –55°C to +125°C operation, with 0.3" wide DIP footprint and 170°C/W θJA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Buffered +2.5 V reference input; max 1 µA input current; reference errors directly scale full-scale gain error |
| 2 - VIN | Analog input channel | High-impedance (≤500 nA input current) unipolar input for 0 V to +2.5 V signals; connects directly to track/hold amplifier |
| 3 - AGND | Analog ground | Reference return for track/hold, comparator, and DAC; must be isolated from DGND to preserve DC accuracy |
| 4 - SCLK | Serial clock input | External clock up to 8.33 MHz; rising edge clocks out SDATA; falling edge validates data; must go low after transmission |
| 5 - SDATA | Serial data output | Three-state output providing 16-bit frame (4 zeros + 12-bit result); disabled on 16th SCLK falling edge |
| 6 - DGND | Digital ground | Return for logic inputs/outputs; separation from AGND prevents digital noise from corrupting analog conversion |
| 7 - CONVST | Convert start input | Edge-triggered: rising edge initiates conversion and hold mode; falling edge resets serial shift register |
| 8 - VDD | Positive supply | +5 V ±5% supply; powers analog and digital sections; IDD ≤ 9 mA max ensures stable operation under load |
Key Features
| Feature | Design Value |
|---|---|
| On-chip track/hold amplifier | Acquires to ±1/2 LSB in ≤1.5 µs - eliminates external sample-and-hold IC and associated layout complexity |
| Single +5 V supply operation | 25 mW typical power - removes need for dual-rail supplies or LDOs in portable or remote sensing nodes |
| Two-wire serial interface | 16-bit SCLK/SDATA frame with automatic three-state disable - reduces MCU GPIO count and PCB routing layers |
| Hermetic Cerdip packaging | Q-8 package rated –55°C to +125°C - suitable for aerospace, downhole, and military-grade environmental stress |
| LC²MOS process technology | Mixed bipolar-CMOS fabrication - achieves precision linearity (±1 LSB) while maintaining low power and fast conversion |
Applications
| Industrial Process Monitoring | Aerospace Sensor Interface |
|---|---|
Use Scenario: Digitizing 4–20 mA loop outputs from pressure/temperature transmitters in refinery control cabinets. IC Role / Device Role / Timing Role: ADC front-end converting conditioned 0–2.5 V analog signals into 12-bit digital values for PLC input modules. Use Value: ±1 LSB relative accuracy and 70 dB SNR ensure <0.025% full-scale measurement fidelity over –40°C to +85°C ambient. |
Use Scenario: Acquiring strain gauge bridge outputs in flight control surface position feedback systems. IC Role / Device Role / Timing Role: High-reliability ADC capturing dynamic analog signals under vibration and thermal cycling. Use Value: Hermetic Q-8 package and –55°C to +125°C rating enable operation in avionics bays without derating or shielding. |
| Portable Test Equipment | Downhole Oilfield Instrumentation |
Use Scenario: Battery-powered handheld multimeter measuring DC voltage with autoranging and auto-zero. IC Role / Device Role / Timing Role: Low-power ADC interfacing directly to multiplexed front-end amplifiers and reference buffers. Use Value: 25 mW typical dissipation extends battery life; 6 µs conversion allows rapid display updates without sacrificing resolution. |
Use Scenario: Real-time logging of downhole gamma-ray detector outputs during directional drilling. IC Role / Device Role / Timing Role: Radiation-tolerant ADC digitizing high-impedance scintillation pulse amplitudes in extreme temperature gradients. Use Value: ≤500 nA input current prevents loading of detector preamp outputs; Cerdip seal prevents moisture ingress at 150°C wellbore temps. |
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-2 | SO-8 plastic package; same electrical specs but rated only to +85°C; 170°C/W θJA vs. 125°C/W for Q-8 | Commercial/industrial environments without extended temperature or hermeticity requirements | Select when cost-sensitive and operating within –40°C to +85°C; not suitable for aerospace or downhole use |
| AD7892BR-2 | 12-bit, 1.5 µs conversion time; SO-8; ±1 LSB linearity; 0–2.5 V input; but requires external track/hold and reference buffer | Higher throughput needed where system-level track/hold is already present | Choose when >117 kHz sampling is required and board space permits discrete support components |
Compared with AD7893AR-2, AD7893SQ-2 provides guaranteed operation to +125°C and hermetic reliability, while AD7892BR-2 trades integrated track/hold for faster conversion-making AD7893SQ-2 optimal for ruggedized, self-contained measurement nodes where size and environmental robustness are critical.
Availability
AD7893SQ-2 is available at Aetrix Electronics and suitable for industrial process monitoring, aerospace sensor interface, portable test equipment, and downhole oilfield instrumentation requiring stable component supply across extended temperature ranges.
Supply support for AD7893SQ-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, founded in 1965 and headquartered in Wilmington, MA.
The AD7893 product line delivers compact, single-supply 12-bit ADCs with integrated track/hold and serial interface-designed specifically for space-constrained, high-reliability data acquisition in harsh environments.
FAQ
What is the operating temperature range of the AD7893SQ-2?
The AD7893SQ-2 is specified for operation from –55°C to +125°C, matching its Cerdip (Q-8) hermetic package rating. This exceeds the –40°C to +85°C range of plastic-packaged variants like AD7893AN-2 or AD7893AR-2, making AD7893SQ-2 suitable for aerospace, downhole, and military applications where extreme thermal stability is required.
Does the AD7893SQ-2 require an external reference voltage?
Yes, the AD7893SQ-2 requires an external +2.5 V reference applied to the REF IN pin. The reference input is buffered on-chip with ≤1 µA input current, and the part is specified for 2.375 V to 2.625 V input range (±5%). Reference inaccuracies directly contribute to full-scale gain error, so precision references like the AD780 are recommended for AD7893SQ-2 designs.
How does the AD7893SQ-2 handle serial data framing and timing?
The AD7893SQ-2 outputs a 16-bit serial frame: four leading zeros followed by the 12-bit conversion result (MSB first). Data is clocked out on the rising edge of SCLK and valid on the falling edge. After the 16th falling edge of SCLK, SDATA enters three-state mode. SCLK must be returned low between reads to prevent shift register misalignment.
Can the AD7893SQ-2 interface directly with a microcontroller GPIO without level-shifting?
Yes-the AD7893SQ-2 logic inputs (CONVST, SCLK) accept VIH ≥ 2.4 V and VIL ≤ 0.8 V at VDD = +5 V ±5%, fully compatible with standard 5 V CMOS/TTL microcontrollers. Its SDATA output drives VOH ≥ 4.0 V (ISOURCE = 200 µA) and VOL ≤ 0.4 V (ISINK = 1.6 mA), ensuring robust interfacing without external buffers or level shifters.
What is the significance of the "SQ" suffix in AD7893SQ-2?
The "SQ" in AD7893SQ-2 denotes the Cerdip (ceramic dual-in-line) package variant with extended temperature range (–55°C to +125°C). "S" indicates the extended temperature grade, and "Q" specifies the hermetic ceramic package-distinct from "N" (plastic DIP) and "R" (SOIC) variants. This suffix confirms the part's suitability for high-reliability, mission-critical applications.
AD7893SQ-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- -55°C ~ 125°C
- Supplier Device Package:
- 8-CERDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7893SQ-2 FAQ
1.How can I place an order for AD7893SQ-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7893SQ-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 AD7893SQ-2 reliable?
The price and inventory of AD7893SQ-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7893SQ-2 is usually 5 days.
3.What payment methods are accepted for AD7893SQ-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7893SQ-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7893SQ-2?
AD7893SQ-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7893SQ-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 AD7893SQ-2?
For technical support, including AD7893SQ-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7893SQ-2 requirements.
6.How does Aetrix verify that AD7893SQ-2 is sourced from the original manufacturer or authorized distributors?
All AD7893SQ-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 AD7893SQ-2 meets industry standards.
7.What is the process for return or replacement of AD7893SQ-2?
All AD7893SQ-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7893SQ-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 AD7893SQ-2 part is unused and in its original packaging.
Return procedure for AD7893SQ-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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