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Analog Devices Inc. AD7894ARZ-2REEL7
- Part No.:
- AD7894ARZ-2REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7894ARZ-2REEL7.pdf
- Description:
- IC ADC 14BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,118
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Product details
Overview
AD7894ARZ-2REEL7 from Analog Devices is a 14-bit, single-supply successive-approximation ADC with 5 µs conversion time in Mode 1, ±2.5 V input range (AD7894-3 variant), on-chip track/hold amplifier, and high-speed two-wire serial interface (SCLK/SDATA). It operates from +5 V ±5%, consumes 20 mW typical, and targets precision data acquisition in industrial instrumentation and portable test equipment.
For engineers reviewing the AD7894ARZ-2REEL7 datasheet, AD7894ARZ-2REEL7 pinout, AD7894ARZ-2REEL7 application, or AD7894ARZ-2REEL7 equivalent, key selection considerations include its SO-8 package, 160 kHz maximum throughput, ±1.5 LSB relative accuracy (B-grade), 77 dB SNR at 70 kHz, and compatibility with external +2.5 V reference sources such as AD780.
Technical Context
The AD7894ARZ-2REEL7 implements a laser-trimmed internal clock driving a 14-bit R-2R ladder SAR core, with integrated track/hold enabling full-scale sine wave digitization up to >100 kHz input bandwidth. Its analog front-end uses resistor scaling for ±2.5 V bipolar input (AD7894-3), buffered reference input (REF IN), and high-impedance VIN node drawing ≤1.5 mA max.
Control logic supports two modes: Mode 1 delivers 5 µs conversion with continuous operation; Mode 2 enables automatic power-down after conversion, reducing IDD to 20 µA max and power dissipation to 100 µW max, with 5 µs wake-up latency before next CONVST-triggered hold. Serial output provides 16-bit frames (two leading zeros + 14-bit twos-complement data) synchronized to SCLK falling edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14 bits - guarantees no missing codes over full operating temperature range (–40°C to +85°C) |
| Conversion Time | 5 µs max (Mode 1) - enables 160 kHz maximum sampling rate with 250 ns quiet time before next CONVST |
| Analog Input Range | ±2.5 V - matches AD7894-3 variant; requires external +2.5 V reference at REF IN pin |
| Relative Accuracy | ±1.5 LSB max (B-grade) - defines end-point nonlinearity error across full scale |
| Signal-to-(Noise+Distortion) | 77 dB min at fIN = 70 kHz - specifies dynamic performance for AC signal fidelity |
| Power Dissipation | 20 mW typical - achieved at +5 V supply with digital inputs at VDD/GND; drops to 15 µW in auto-sleep mode |
| Serial Interface Speed | 16 MHz max SCLK - supports 1.0 µs read time for 16-bit frame; timing constrained by t4 = 60 ns data access |
Pinout & Package
AD7894ARZ-2REEL7 is housed in an 8-lead narrow-body SOIC (SO-8) package with standard JEDEC MS-012AC footprint (5.3 mm × 6.2 mm, 1.27 mm pitch). Pin 1 is marked with a dot or bevelled corner; pins are numbered counterclockwise from top-left in top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Buffered, high-impedance node accepting +2.5 V ±5% reference; 1 µA max input current; errors directly cause gain error |
| 2 - VIN | Analog input channel | Accepts ±2.5 V differential input (AD7894-3); 1.5 mA max input current; connects to on-chip track/hold amplifier |
| 3 - GND | Analog ground reference | Common return for track/hold, comparator, DAC, and digital circuitry; must be low-impedance connection |
| 4 - SCLK | Serial clock input | Edge-triggered control line; falling edge clocks out SDATA bit; 16 MHz max frequency; 31.25 ns min pulse width |
| 5 - SDATA | Serial data output | Three-state CMOS output; delivers 16-bit frame (2 leading zeros + 14-bit twos-complement result); valid 10 ns after SCLK falling edge |
| 6 - BUSY | Conversion status indicator | Active-high open-drain output; goes high on CONVST falling edge, returns low 5 µs later when conversion completes |
| 7 - CONVST | Conversion start trigger | Edge-sensitive input; falling edge initiates track-to-hold transition and conversion; low hold duration determines Mode 1 vs Mode 2 behavior |
| 8 - VDD | Positive supply rail | +5 V ±5% supply; powers analog and digital sections; 5.5 mA max IDD; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| On-chip track/hold amplifier | Acquires input to 14-bit accuracy in ≤0.35 µs; supports >100 kHz small-signal bandwidth and <50 ps aperture jitter |
| Auto power-down mode | Reduces IDD to 20 µA max between conversions; eliminates need for external sleep control logic in battery-powered systems |
| High-speed serial interface | Two-wire (SCLK/SDATA) protocol with 16 MHz max clock; eliminates parallel bus routing and reduces MCU GPIO count |
| Single +5 V supply operation | Eliminates dual-rail or charge-pump requirements; simplifies power architecture while maintaining 77 dB SNR performance |
| Pin-compatible upgrade path | Direct replacement for 12-bit AD7895 in same SO-8 footprint; preserves PCB layout while increasing resolution by 2 bits |
Applications
| Industrial Process Monitoring | Portable Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of ±2.5 V sensor outputs (e.g., strain gauges, RTDs) in factory-floor PLC I/O modules with 160 kHz sampling capability. IC Role / Device Role / Timing Role: Primary ADC performing synchronized multi-channel sampling; BUSY signal coordinates timing with host controller; SCLK driven by FPGA at 16 MHz. Use Value: 14-bit resolution and 77 dB SNR enable detection of sub-millivolt-level process variations without external amplification or filtering. |
Use Scenario: Battery-operated environmental sensor node recording temperature, pressure, and humidity over extended periods using intermittent sampling. IC Role / Device Role / Timing Role: Low-power ADC executing Mode 2 auto-sleep cycles; CONVST pulses triggered by RTC alarm; SDATA read only during active measurement windows. Use Value: 15 µW typical standby power extends battery life to >5 years in 1-sample-per-minute duty cycle, validated per datasheet IDD spec. |
| Test & Measurement Equipment | Medical Instrumentation |
Use Scenario: Digitizing calibrated ±2.5 V analog outputs from precision signal generators or calibration standards in benchtop multimeters. IC Role / Device Role / Timing Role: High-fidelity front-end ADC; REF IN driven by AD780 reference; serial interface isolated via optocouplers to prevent ground loops. Use Value: ±1.5 LSB relative accuracy and <–86 dB THD ensure traceable metrology-grade measurements compliant with IEC 61000-4-30 Class A. |
Use Scenario: Acquisition of biopotential signals (e.g., ECG leads) scaled to ±2.5 V range using front-end instrumentation amplifiers in portable patient monitors. IC Role / Device Role / Timing Role: Isolated ADC stage; GND pin tied to isolated analog ground plane; BUSY signal used for DMA synchronization with ARM Cortex-M4 host. Use Value: 0.3 mV LSB size and 7.5 MHz track/hold bandwidth preserve QRS complex morphology without aliasing or slew-induced distortion. |
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-3 | B-grade (±1.5 LSB INL vs A-grade ±2 LSB); identical SO-8 package, pinout, and timing | Same ±2.5 V input range and serial interface; optimized for higher-accuracy industrial sensors | Select when tighter DC accuracy is required and cost premium is acceptable |
| ADS8325IPW | 16-bit resolution, 2.7–5.5 V supply, SPI-compatible interface; larger TSSOP-16 package; no integrated track/hold | Requires external track/hold and reference; suited for ultra-high-resolution DC-coupled applications | Choose for enhanced resolution where board space allows larger package and additional support components |
Compared with AD7894BRZ-3, AD7894ARZ-2REEL7 trades 0.5 LSB INL tolerance for lower cost and broader availability; versus ADS8325IPW, it offers integrated track/hold and smaller SO-8 footprint at the expense of 2-bit resolution and fixed +5 V supply.
Availability
AD7894ARZ-2REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, test & measurement equipment, and medical instrumentation requiring stable component supply across long production lifecycles.
Supply support for AD7894ARZ-2REEL7 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 leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.
The AD7894 product line delivers fast, low-power, single-supply 14-bit SAR ADCs in compact SO-8 packages, designed specifically for space-constrained, battery-aware, and high-accuracy data acquisition in industrial and portable instrumentation.
FAQ
What is the input voltage range supported by AD7894ARZ-2REEL7?
The AD7894ARZ-2REEL7 is the AD7894-3 variant and supports a bipolar ±2.5 V analog input range. This is achieved through internal resistor scaling and requires an external +2.5 V reference applied to the REF IN pin. The input current remains ≤1.5 mA across the full range, and the VIN pin connects directly to the on-chip track/hold amplifier.
Does AD7894ARZ-2REEL7 require an external reference voltage?
Yes, AD7894ARZ-2REEL7 requires an external +2.5 V reference voltage applied to the REF IN pin. The device includes an on-chip buffer with ≤1 µA input current and 10 pF input capacitance. Precision references such as the AD780 or AD680 are recommended to maintain specified gain accuracy and SNR performance.
How does the power-down mode operate in AD7894ARZ-2REEL7?
In Mode 2 (auto-sleep), AD7894ARZ-2REEL7 automatically enters power-down after conversion completion (when BUSY goes low), reducing IDD to 20 µA max and power dissipation to 100 µW max. A rising edge on CONVST wakes the device with ~5 µs latency before the next conversion starts, enabling significant energy savings in low-duty-cycle applications.
What serial interface protocol does AD7894ARZ-2REEL7 use?
AD7894ARZ-2REEL7 uses a proprietary two-wire synchronous serial interface with SCLK (input) and SDATA (output). Data is clocked out on the falling edge of SCLK; each conversion yields a 16-bit frame (two leading zeros followed by 14-bit twos-complement result), readable within 1.0 µs at 16 MHz SCLK.
Is AD7894ARZ-2REEL7 pin-compatible with other members of the AD7894 family?
Yes, AD7894ARZ-2REEL7 shares identical SO-8 pinout and footprint with all AD7894 variants (e.g., AD7894ARZ-10, AD7894BRZ-3). Pin functions - including REF IN, VIN, GND, SCLK, SDATA, BUSY, CONVST, and VDD - are fully consistent across the family, enabling drop-in substitution based on input range and grade requirements.
AD7894ARZ-2REEL7 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-2REEL7 FAQ
1.How can I place an order for AD7894ARZ-2REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7894ARZ-2REEL7 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-2REEL7 reliable?
The price and inventory of AD7894ARZ-2REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7894ARZ-2REEL7 is usually 5 days.
3.What payment methods are accepted for AD7894ARZ-2REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7894ARZ-2REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7894ARZ-2REEL7?
AD7894ARZ-2REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7894ARZ-2REEL7 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-2REEL7?
For technical support, including AD7894ARZ-2REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7894ARZ-2REEL7 requirements.
6.How does Aetrix verify that AD7894ARZ-2REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7894ARZ-2REEL7 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-2REEL7 meets industry standards.
7.What is the process for return or replacement of AD7894ARZ-2REEL7?
All AD7894ARZ-2REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7894ARZ-2REEL7, 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-2REEL7 part is unused and in its original packaging.
Return procedure for AD7894ARZ-2REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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