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Analog Devices Inc. AD7894ARZ-10REEL7
- Part No.:
- AD7894ARZ-10REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7894ARZ-10REEL7.pdf
- Description:
- IC ADC 14BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,056
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Product details
Overview
AD7894ARZ-10REEL7 from Analog Devices is a 14-bit, 5 µs successive-approximation analog-to-digital converter (ADC) with integrated track/hold amplifier, on-chip clock, and high-speed two-wire serial interface. It operates from a single +5 V supply, accepts ±10 V analog input range, delivers 77 dB SNR at 160 kHz sampling, and consumes 20 mW typical power. It is used in precision data acquisition systems requiring fast, low-power digitization of bipolar industrial sensor signals.
For engineers reviewing the AD7894ARZ-10REEL7 datasheet, AD7894ARZ-10REEL7 pinout, AD7894ARZ-10REEL7 application, or AD7894ARZ-10REEL7 equivalent, key selection considerations include its ±10 V input range, twos-complement output coding, 5 µs conversion time in high-sampling mode, SO-8 package compatibility, and requirement for external +2.5 V reference (e.g., AD780).
Technical Context
The AD7894ARZ-10REEL7 implements a laser-trimmed internal clock driving a 14-bit R-2R ladder SAR core, with on-chip track/hold enabling full-scale sine wave conversion at 100 kHz+ input bandwidth. Its analog front-end uses resistor scaling (R1=8 kΩ, R2=2 kΩ, R3=2 kΩ) to support ±10 V input while maintaining high input impedance and <2 mA max input current.
Control logic supports two distinct operating modes: Mode 1 (5 µs conversion, continuous operation) and Mode 2 (10 µs effective cycle including 5 µs wake-up, auto-power-down). Serial data output is 16-bit (two leading zeros + 14-bit twos-complement result), synchronized to falling edge of SCLK, with guaranteed 10 ns data hold time and 60 ns access time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14 bits - guarantees no missing codes; defines quantization step of 1.22 mV for ±10 V range |
| Conversion Time | 5 µs max (Mode 1) - enables up to 160 kHz sustained sampling rate with 250 ns quiet time |
| Analog Input Range | ±10 V - supports direct connection to industrial ±10 V sensors without external scaling |
| SNR | 77 dB min (fIN = 70 kHz) - ensures >12.5 ENOB for high-fidelity signal capture |
| Power Dissipation | 20 mW typical - enables battery-powered portable instrumentation with minimal thermal load |
| Reference Input | +2.5 V ±5% - requires stable external reference (e.g., AD780); gain error directly tracks reference accuracy |
| Differential Nonlinearity | –1 to +1.5 LSB max - maintains monotonicity across full transfer function |
Pinout & Package
AD7894ARZ-10REEL7 is housed in an 8-lead narrow-body SOIC (SO-8) package with standard JEDEC MS-012AC footprint (5.3 mm × 4.4 mm, 1.27 mm pitch). Pin 1 is marked by a beveled corner or dot; device orientation follows top-view pin numbering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Buffered on-chip input for +2.5 V external reference; 1 µA max input current; 10 pF max capacitance |
| 2 - VIN | Analog input channel | Accepts ±10 V differential input; high-impedance node after internal resistor network; 2 mA max input current |
| 3 - GND | Analog ground reference | Common return for track/hold, comparator, DAC, and digital circuitry; must be low-impedance star point |
| 4 - SCLK | Serial clock input | External clock up to 16 MHz; falling edge clocks out SDATA; min pulse width 31.25 ns |
| 5 - SDATA | Serial data output | Three-state output; 16-bit frame (2 leading zeros + 14-bit twos-complement); valid 10 ns after SCLK falling edge |
| 6 - BUSY | Conversion status indicator | Active-high open-drain output; goes high on CONVST falling edge, low when conversion complete (5 µs later) |
| 7 - CONVST | Conversion start trigger | Edge-sensitive input; falling edge initiates track→hold transition and conversion; low at end enables auto-power-down |
| 8 - VDD | Positive supply | +5 V ±5% supply; 5.5 mA max IDD; powers all analog and digital sections |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply 14-bit ADC in SO-8 | Integrates SAR core, track/hold, clock, and serial interface in space-constrained 8-pin layout-eliminates need for discrete support ICs |
| High-speed serial interface | Two-wire (SCLK/SDATA) protocol with 16 MHz max clock enables microcontroller interfacing with minimal GPIO usage and PCB routing |
| Auto-power-down mode | Reduces IDD to 20 µA max between conversions-cuts average power >99% in low-duty-cycle applications like periodic sensor polling |
| On-chip track/hold amplifier | Acquires input to 14-bit accuracy in ≤0.35 µs-enables accurate digitization of fast-changing ±10 V signals without external THA |
| Bipolar input scaling | Internal resistor network (8k/2k/2k Ω) translates ±10 V input to internal 0–5 V range-preserves SNR while avoiding external op-amp level-shifting |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous digitization of ±10 V outputs from strain-gauge load cells and RTD transmitters in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor data at 100 kHz; provides 14-bit resolution with <±2 LSB INL for calibration-grade accuracy. Use Value: Eliminates external signal conditioning, reduces BOM count by 3–4 components per channel, and maintains 77 dB SNR under industrial EMI conditions. |
Use Scenario: High-speed waveform capture in portable oscilloscopes and automated test equipment requiring compact, low-power digitizers. IC Role / Device Role / Timing Role: Front-end ADC acquiring transient signals; leverages 5 µs conversion + 16 MHz serial interface for real-time streaming to FPGA buffer. Use Value: Enables 160 kSPS sustained throughput with deterministic timing-critical for FFT-based spectral analysis and pass/fail go/no-go testing. |
| Portable Data Loggers | Motor Control Feedback Systems |
Use Scenario: Battery-powered environmental monitors logging temperature, pressure, and vibration using ±10 V industrial sensors. IC Role / Device Role / Timing Role: Low-duty-cycle ADC operating in Mode 2 auto-sleep; wakes only for scheduled 10 Hz sampling bursts. Use Value: Reduces average supply current to ~25 µA-extends AA battery life from days to >12 months without compromising 14-bit resolution. |
Use Scenario: Real-time current sensing in servo drives, where ±10 V isolated amplifier outputs feed position/velocity feedback loops. IC Role / Device Role / Timing Role: High-accuracy ADC synchronizing with PWM carrier frequency; provides 14-bit current measurement within 5 µs latency. Use Value: Supports closed-loop bandwidths >10 kHz while maintaining <0.1% gain error-essential for torque ripple reduction and smooth motion control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7894BRZ-10 | Same SO-8 package and pinout; ±1.5 LSB INL (vs. ±2 LSB for ARZ grade); identical timing, power, and interface | Higher DC accuracy required for metrology-grade calibration systems where <±1.5 LSB linearity is mandatory | Select BRZ-10 when absolute linearity error must be minimized; ARZ-10 remains optimal for cost-sensitive industrial DAQ where ±2 LSB meets spec |
| ADS8325IPW | 16-bit, 100 kSPS, SPI interface, ±10 V input via external PGA; requires external reference and level-shifting; larger TSSOP-20 package | Applications needing higher resolution (>14-bit) but tolerating lower speed and larger board area | Choose ADS8325IPW only if 16-bit ENOB is essential; AD7894ARZ-10REEL7 offers superior speed/power density and simpler system integration |
Compared with AD7894BRZ-10, the AD7894ARZ-10REEL7 trades 0.5 LSB INL for lower cost and broader availability; versus ADS8325IPW, it delivers 60% faster throughput in half the package area with no external support components-making it optimal for space- and power-constrained 14-bit DAQ.
Availability
AD7894ARZ-10REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, portable test equipment, motor control feedback systems, and battery-powered data loggers requiring stable component supply across multi-year production cycles.
Supply support for AD7894ARZ-10REEL7 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design and manufacturing facilities worldwide.
The AD7894 product line was engineered for high-speed, low-power, single-supply data acquisition in space-constrained industrial and portable instrumentation-prioritizing integration, ease of use, and robustness over raw resolution.
FAQ
What is the maximum sampling rate achievable with AD7894ARZ-10REEL7?
The AD7894ARZ-10REEL7 achieves a maximum sustained sampling rate of 160 kHz in Mode 1 (high-sampling mode), calculated from 5 µs conversion time + 1.0 µs serial read time (at 16 MHz SCLK) + 250 ns minimum quiet time. This rate assumes strict adherence to timing constraints in Figure 3 of the datasheet and proper track/hold settling between conversions. The AD7894ARZ-10REEL7 cannot exceed this rate without violating specification limits on SNR and linearity.
Does AD7894ARZ-10REEL7 require an external voltage reference?
Yes, the AD7894ARZ-10REEL7 requires an external +2.5 V reference applied to the REF IN pin. The device does not contain an internal reference; its full-scale accuracy and gain stability directly depend on reference voltage precision and noise performance. Recommended references include the AD780 (2.5 V, 100 ppm/°C drift) or AD680 (2.5 V, 20 ppm/°C drift), both specified for low-output-impedance, low-noise operation compatible with the AD7894ARZ-10REEL7's 1 µA max REF IN current.
What is the difference between AD7894ARZ-10REEL7 and AD7894BRZ-10?
The AD7894ARZ-10REEL7 and AD7894BRZ-10 share identical pinout, package (SO-8), timing, power, and interface specifications. Their primary difference is DC accuracy: the BRZ-10 grade guarantees ±1.5 LSB integral nonlinearity (INL), while the ARZ-10REEL7 grade guarantees ±2 LSB INL. Both operate over –40°C to +85°C and accept ±10 V input. The AD7894ARZ-10REEL7 is optimized for cost-sensitive industrial applications where ±2 LSB meets system-level accuracy requirements.
Can AD7894ARZ-10REEL7 interface directly with a 3.3 V microcontroller?
Yes, the AD7894ARZ-10REEL7's digital I/O (SCLK, SDATA, BUSY, CONVST) is compatible with 3.3 V logic levels when VDD = +5 V. Input high voltage (VINH) is specified at 2.4 V min, and output high voltage (VOH) is 4.0 V min into 400 µA load-ensuring reliable recognition by 3.3 V receivers. However, SDATA is three-stated when inactive, so a pull-up resistor to 3.3 V may be needed if the host MCU lacks internal weak pull-ups. No level-shifting circuitry is required for basic operation.
What are the power-saving features of AD7894ARZ-10REEL7?
The AD7894ARZ-10REEL7 incorporates an automatic power-down mode (Mode 2) that reduces supply current to 20 µA max between conversions when CONVST is held low after conversion completion. Upon rising edge of CONVST, the part "wakes up" in ~5 µs before initiating the next conversion. This feature cuts average power consumption by >99% in low-duty-cycle applications such as periodic sensor polling, extending battery life in portable instruments without sacrificing 14-bit resolution or 5 µs conversion capability.
AD7894ARZ-10REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 200k
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7894ARZ-10REEL7 FAQ
1.How can I place an order for AD7894ARZ-10REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7894ARZ-10REEL7 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 AD7894ARZ-10REEL7 reliable?
The price and inventory of AD7894ARZ-10REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7894ARZ-10REEL7 is usually 5 days.
3.What payment methods are accepted for AD7894ARZ-10REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7894ARZ-10REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7894ARZ-10REEL7?
AD7894ARZ-10REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7894ARZ-10REEL7 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 AD7894ARZ-10REEL7?
For technical support, including AD7894ARZ-10REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7894ARZ-10REEL7 requirements.
6.How does Aetrix verify that AD7894ARZ-10REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7894ARZ-10REEL7 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 AD7894ARZ-10REEL7 meets industry standards.
7.What is the process for return or replacement of AD7894ARZ-10REEL7?
All AD7894ARZ-10REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7894ARZ-10REEL7, 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 AD7894ARZ-10REEL7 part is unused and in its original packaging.
Return procedure for AD7894ARZ-10REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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