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Analog Devices Inc. AD7893SQ-10
- Part No.:
- AD7893SQ-10
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD7893SQ-10.pdf
- Description:
- IC ADC 12BIT SAR 8CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,815
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Product details
Overview
AD7893SQ-10 from Analog Devices is a high-speed, 12-bit successive-approximation analog-to-digital converter (ADC) with integrated track/hold amplifier, on-chip clock, and two-wire serial interface. It operates from a single +5 V supply, delivers ±10 V input range, achieves 6 µs conversion time and 70 dB SNR at 10 kHz, and targets precision data acquisition in harsh environments.
For engineers reviewing the AD7893SQ-10 datasheet, AD7893SQ-10 pinout, AD7893SQ-10 application, or AD7893SQ-10 equivalent, this page provides verified functional identity, Cerdip package mapping, validated 8-pin terminal roles, confirmed dynamic and DC accuracy specs, and real-world timing constraints for embedded industrial and aerospace signal conditioning systems.
Technical Context
The AD7893SQ-10 implements a laser-trimmed internal clock driving a 12-bit R-2R ladder SAR core, with on-chip track/hold acquiring to ±1/2 LSB in ≤1.5 µs. Its analog front-end scales ±10 V inputs via internal resistor network (R1=30 kΩ, R2=7.5 kΩ, R3=10 kΩ), referenced to a buffered +2.5 V external reference.
Control logic responds to edge-triggered CONVST: rising edge initiates hold and conversion; falling edge resets the serial shift register. Serial output delivers 16-bit frames-four leading zeros followed by twos-complement 12-bit data-with SDATA valid on SCLK falling edges and three-stated after the 16th falling edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes over 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 | ±10 V - supports bipolar industrial sensor signals without external level-shifting circuitry |
| Signal-to-(Noise+Distortion) | 70 dB min at fIN = 10 kHz - meets precision measurement requirements for 12-bit effective resolution |
| Power Dissipation | 45 mW max (25 mW typical) - compatible with thermally constrained embedded modules and battery-backed systems |
| Reference Input | +2.5 V ±5% - requires external precision reference (e.g., AD780); gain error directly tracks reference drift |
| Output Coding | Twos complement - simplifies signed arithmetic in DSP-based control loops and FFT processing |
Pinout & Package
AD7893SQ-10 is housed in an 8-pin Cerdip (Q-8) hermetic package rated for –55°C to +125°C operation, with 0.3" wide DIP footprint and glass-sealed construction suitable for high-reliability aerospace and defense applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Buffered +2.5 V reference node; max 1 µA input current; errors here cause proportional full-scale and offset errors |
| 2 - VIN | Analog input channel | ±10 V input with 16 kΩ min input resistance; accepts bipolar industrial transducer outputs directly |
| 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 out SDATA; 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 SCLK falling edge |
| 6 - DGND | Digital ground reference | Ground return for logic circuitry; separation from AGND prevents digital noise coupling into analog path |
| 7 - CONVST | Convert start input | Falling edge resets serial register; rising edge triggers track→hold transition and starts 6 µs conversion |
| 8 - VDD | Positive supply | +5 V ±5%; powers entire IC including track/hold, SAR core, and serial interface; 9 mA max IDD |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply 12-bit ADC in 8-pin package | Eliminates need for dual ±15 V supplies and external track/hold IC, reducing BOM count and PCB area by >40% vs discrete solutions |
| On-chip track/hold with 1.5 µs acquisition | Enables accurate digitization of full-scale sine waves up to 58 kHz without external bandwidth limiting |
| High-speed two-wire serial interface | Reduces microcontroller GPIO usage to only two pins (SCLK/SDATA), easing integration with resource-constrained MCUs |
| LC2MOS process technology | Combines bipolar precision for analog performance with CMOS logic efficiency, achieving 25 mW typical power at 12-bit resolution |
| Cerdip hermetic packaging (Q-8) | Provides moisture resistance, thermal stability, and long-term reliability in extended temperature and high-vibration environments |
Applications
| Industrial Process Monitoring | Aerospace Sensor Interface |
|---|---|
Use Scenario: Continuous monitoring of ±10 V output from strain-gauge load cells and RTD signal conditioners in refinery control cabinets. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor data at 100 kHz with deterministic 6 µs conversion latency and synchronized serial readout. Use Value: Eliminates external op-amp scaling and sample-hold stages while maintaining 70 dB SNR across –40°C to +85°C ambient, reducing calibration complexity. | Use Scenario: Digitizing accelerometer and gyroscope outputs in flight control units where EMI immunity and thermal stability are critical. IC Role / Device Role / Timing Role: High-reliability ADC interfacing with MIL-STD-1553 bus controllers; CONVST used as interrupt to trigger DMA reads. Use Value: Cerdip packaging ensures operational integrity at –55°C to +125°C; twos-complement output simplifies inertial navigation math in FPGA-based Kalman filters. |
| Portable Test Equipment | Energy Metering Front-End |
Use Scenario: Battery-powered handheld oscilloscopes requiring low-power, high-speed sampling of ±10 V probe signals. IC Role / Device Role / Timing Role: Core acquisition engine operating from single Li-ion cell (via +5 V regulator); 25 mW typical dissipation extends runtime. Use Value: Integrated track/hold removes need for external THS, cutting board space and enabling 12-bit accuracy at 117 kSPS without thermal drift penalties. | Use Scenario: Anti-tampering energy meters measuring phase voltage (±10 V scaled from 240 VAC) in smart grid infrastructure. IC Role / Device Role / Timing Role: Isolated ADC stage referenced to precision AD780; serial interface connects to secure MCU via optocoupled lines. Use Value: ±1 LSB relative accuracy and 70 dB SNR ensure Class 0.5 metering compliance; hermetic Q-8 package resists humidity-induced parametric shift. |
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-10 | SOIC-8 package, –40°C to +85°C rating, ±1/2 LSB relative accuracy | Lower-cost commercial-grade replacement; lacks hermetic sealing and extended temperature range | Select for cost-sensitive industrial controls where extended temp and reliability are not required |
| ADS7822U | 12-bit, 200 kSPS, SPI interface, +2.7 V to +5.25 V supply, no internal track/hold | Higher speed but requires external track/hold and reference; smaller SO-8 package | Select when throughput >117 kSPS is needed and board space allows external analog front-end components |
Compared with AD7893BR-10, AD7893SQ-10 trades ±1/2 LSB linearity for –55°C to +125°C operation and hermetic reliability; compared with ADS7822U, it sacrifices speed and supply flexibility to integrate track/hold and simplify system-level design for ruggedized measurement nodes.
Availability
AD7893SQ-10 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 production lifecycles.
Supply support for AD7893SQ-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, communications, automotive, and defense markets since 1965.
The AD7893 product line delivers compact, single-supply 12-bit ADCs with integrated track/hold and serial interfaces for space-constrained, high-reliability data acquisition systems operating in extreme environments.
FAQ
What is the absolute maximum analog input voltage for AD7893SQ-10?
The absolute maximum analog input voltage for AD7893SQ-10 is ±17 V relative to AGND. This rating applies under all conditions, including power-up, power-down, and fault states. Exceeding ±17 V may cause permanent damage. The specified ±10 V input range is for normal operation with guaranteed linearity and accuracy; operation beyond that range risks parametric degradation even if below absolute maximum limits. Always use clamping diodes or input protection circuits when transient overvoltage is possible.
Does AD7893SQ-10 require an external clock source for conversion?
No, AD7893SQ-10 does not require an external clock for the A/D conversion process. It contains a laser-trimmed internal oscillator that generates the 6 µs conversion timing autonomously. However, an external serial clock (SCLK) is mandatory to read out the 12-bit result via the two-wire serial interface. SCLK frequency can go up to 8.33 MHz, and its rising edge clocks data out of SDATA; the part remains fully functional with only CONVST and SCLK driven externally.
What is the purpose of the four leading zeros in AD7893SQ-10's serial output format?
The four leading zeros in AD7893SQ-10's 16-bit serial frame provide fixed alignment for the 12-bit twos-complement result, ensuring consistent bit positioning regardless of sign. This simplifies firmware parsing: the MSB (DB11) always appears as the 5th bit after the start of transmission, and the LSB (DB0) is always the 16th bit. The zeros also allow the SDATA line to be three-stated cleanly after the 16th SCLK falling edge, preventing bus contention during idle periods between conversions.
Can AD7893SQ-10 operate with a reference voltage other than +2.5 V?
AD7893SQ-10 is specified and characterized for operation with a +2.5 V ±5% reference voltage applied to REF IN. While the input range scales linearly with reference voltage (e.g., ±10 V full-scale corresponds to 4×REF IN), using voltages outside 2.375 V to 2.625 V violates datasheet specifications and degrades accuracy, particularly full-scale error and SNR. The internal reference buffer is optimized for +2.5 V; deviation increases gain error and may reduce common-mode rejection. Precision references like AD780 or AD680 are recommended to maintain 70 dB SNR performance.
How does the CONVST signal function in AD7893SQ-10 timing control?
In AD7893SQ-10, CONVST is an edge-triggered control input: its rising edge initiates the track-to-hold transition and starts the 6 µs conversion sequence, while its falling edge resets the internal serial output shift register. This dual-edge functionality enables flexible timing schemes - for example, a 6 µs square wave on CONVST lets the falling edge serve as a hardware interrupt to trigger data read, eliminating software timing loops. Critical timing constraints include allowing ≥600 ns between read completion and the next CONVST rising edge to ensure track/hold settling.
AD7893SQ-10 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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-10 FAQ
1.How can I place an order for AD7893SQ-10 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7893SQ-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 AD7893SQ-10 reliable?
The price and inventory of AD7893SQ-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7893SQ-10 is usually 5 days.
3.What payment methods are accepted for AD7893SQ-10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7893SQ-10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7893SQ-10?
AD7893SQ-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7893SQ-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 AD7893SQ-10?
For technical support, including AD7893SQ-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7893SQ-10 requirements.
6.How does Aetrix verify that AD7893SQ-10 is sourced from the original manufacturer or authorized distributors?
All AD7893SQ-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 AD7893SQ-10 meets industry standards.
7.What is the process for return or replacement of AD7893SQ-10?
All AD7893SQ-10 units undergo pre-shipment inspection (PSI). If there is an issue with AD7893SQ-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 AD7893SQ-10 part is unused and in its original packaging.
Return procedure for AD7893SQ-10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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