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Analog Devices Inc. AD7894ARZ-2REEL
- Part No.:
- AD7894ARZ-2REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7894ARZ-2REEL.pdf
- Description:
- IC ADC 14BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,089
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Product details
Overview
AD7894ARZ-2REEL 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. 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-2REEL datasheet, AD7894ARZ-2REEL pinout, AD7894ARZ-2REEL application, or AD7894ARZ-2REEL 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 automatic power-down mode for low-power operation.
Technical Context
The AD7894ARZ-2REEL implements a laser-trimmed internal clock driving a 14-bit R-2R ladder SAR core, with integrated track/hold amplifier featuring 7.5 MHz small-signal bandwidth and 50 ps aperture jitter. Its analog input stage uses external resistor scaling for ±2.5 V full-scale range and buffers the reference input to limit current to ≤1 µA.
It supports two operating modes: Mode 1 delivers 5 µs conversion with continuous operation, while Mode 2 enables automatic wake-up from power-down (20 µA standby) triggered by CONVST rising edge, adding up to 5 µs wake-up latency before conversion start. Serial data output is twos-complement coded, synchronized to SCLK falling edge, with 16-bit frame (2 leading zeros + 14 data bits).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees no missing codes over full transfer function |
| Conversion Time | 5 µs max (Mode 1) - enables 160 kHz sustained sampling rate with 250 ns quiet time |
| Analog Input Range | ±2.5 V - matches standard industrial bipolar sensor outputs without external scaling |
| Relative Accuracy | ±1.5 LSB max (B-grade) - ensures monotonicity and <0.01% endpoint nonlinearity error |
| Signal-to-Noise+Distortion | 77 dB min (fIN = 70 kHz) - supports >12.5 ENOB for medium-frequency signal capture |
| Power Dissipation | 20 mW typical - enables battery-powered portable instrumentation with minimal thermal load |
| Reference Input | +2.5 V ±5% - requires precision external reference (e.g., AD780); gain errors scale directly with REF IN tolerance |
Pinout & Package
AD7894ARZ-2REEL is housed in an 8-lead narrow-body SOIC (SO-8) package with standard 1.27 mm pitch, JEDEC MS-012 compliant, and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF IN (Pin 1) | Voltage reference input | Accepts buffered +2.5 V ±5% reference; 1 µA max input current; sets full-scale range and gain accuracy |
| VIN (Pin 2) | Analog input channel | ±2.5 V differential input range; high-impedance node after internal scaling resistors; no dynamic charging current |
| GND (Pin 3) | Analog ground reference | Common return for track/hold, comparator, DAC, and digital logic; must be star-connected to minimize noise coupling |
| SCLK (Pin 4) | Serial clock input | External clock up to 16 MHz; falling edge clocks out SDATA; timing-critical for data access (t4 ≤ 60 ns) |
| SDATA (Pin 5) | Serial data output | Two's complement 14-bit result prefixed with two leading zeros; three-stated after 16th SCLK edge |
| BUSY (Pin 6) | Conversion status indicator | Active-high open-drain output; asserts on CONVST falling edge, deasserts 5 µs later when data is valid |
| CONVST (Pin 7) | Conversion start trigger | Edge-sensitive input; falling edge initiates hold/conversion; low level at completion enables auto-power-down |
| VDD (Pin 8) | Positive supply | +5 V ±5%; powers analog and digital sections; 5.5 mA max IDD; decoupling required within 1 cm of pin |
Key Features
| Feature | Design Value |
|---|---|
| On-chip track/hold amplifier | Acquires to 14-bit accuracy in ≤0.35 µs; 7.5 MHz bandwidth supports >100 kHz input signals without aliasing |
| Auto power-down mode | Reduces IDD to 20 µA between conversions; eliminates need for external sleep control logic in intermittent sampling |
| High-speed serial interface | Two-wire (SCLK/SDATA) with 16 MHz max clock; eliminates parallel bus routing and reduces PCB footprint vs. 14-bit parallel ADCs |
| Single +5 V supply operation | Eliminates dual-rail supplies and associated regulators; simplifies power architecture in space-constrained systems |
| Pin-compatible upgrade path | Direct replacement for 12-bit AD7895; preserves layout while increasing resolution and dynamic range |
Applications
| Industrial Process Monitoring | Portable Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of 4–20 mA loop signals conditioned to ±2.5 V via precision I/V converter. IC Role / Device Role / Timing Role: Primary SAR ADC capturing sensor data at 10–100 kHz with deterministic 5 µs conversion latency. Use Value: ±1.5 LSB linearity ensures <0.02% measurement uncertainty across temperature; low 20 mW dissipation avoids self-heating drift in sealed enclosures. |
Use Scenario: Battery-powered field recorder sampling thermocouples and strain gauges at 1–10 kHz with duty-cycled operation. IC Role / Device Role / Timing Role: Low-power ADC enabling 10-year battery life via Mode 2 auto-sleep between samples. Use Value: 20 µA standby current extends battery life; SO-8 package allows compact 2-layer PCB design; serial interface minimizes MCU GPIO usage. |
| Automated Test Equipment (ATE) | Medical Sensor Interfaces |
Use Scenario: High-throughput board-level test system digitizing analog stimulus responses with tight timing control. IC Role / Device Role / Timing Role: Precision ADC synchronized to system clock via CONVST edge triggering and BUSY handshaking. Use Value: 50 ps aperture jitter and 77 dB SNR support accurate characterization of 70 kHz signals; 160 kHz max throughput meets production test cycle time. |
Use Scenario: Patient-worn vital sign monitor acquiring ECG and bioimpedance waveforms with low noise floor. IC Role / Device Role / Timing Role: Front-end ADC providing 14-bit resolution for sub-mV physiological signal digitization. Use Value: High input impedance (>1 GΩ effective) prevents loading of passive sensor filters; 7.5 MHz track/hold bandwidth preserves waveform fidelity. |
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 |
|---|---|---|---|
| AD7940BRMZ | 14-bit, 1 MSPS, SPI-compatible, 2.5 V ref internal/external, no track/hold, 3.3 V supply only | Higher speed but lacks integrated track/hold; requires external op-amp buffer for wideband signals | Select for higher throughput where external signal conditioning is acceptable and 3.3 V supply is available |
| ADS8326IPW | 16-bit, 500 kSPS, SPI interface, internal reference, 2.7–5.5 V supply, no auto-sleep mode | Higher resolution but slower; no power-down feature; larger 16-pin TSSOP package increases layout area | Select when 16-bit resolution is mandatory and power budget allows 5.5 mA active current; avoid for battery-critical designs |
Compared with AD7894ARZ-2REEL, AD7940BRMZ trades integrated track/hold and 5 V compatibility for 2× speed and SPI standardization, while ADS8326IPW offers 2 extra bits at half the sample rate and no autonomous power management-making AD7894ARZ-2REEL uniquely balanced for cost-sensitive, low-power, ±2.5 V industrial sensing.
Availability
AD7894ARZ-2REEL is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, automated test equipment, and medical sensor interfaces requiring stable component supply and long-term obsolescence planning.
Supply support for AD7894ARZ-2REEL 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 Wilmington, MA, with design centers worldwide.
The AD7894 belongs to Analog Devices' precision SAR ADC product line, engineered for high-resolution, low-latency data acquisition in space- and power-constrained industrial and instrumentation systems.
FAQ
What is the correct reference voltage for AD7894ARZ-2REEL?
The AD7894ARZ-2REEL requires an external +2.5 V ±5% reference applied to the REF IN pin. This voltage defines the full-scale range and directly impacts gain accuracy; deviations cause proportional scaling errors. Recommended sources include the AD780 or AD680 precision references, which maintain stability and low noise over temperature.
Does AD7894ARZ-2REEL support unipolar input ranges?
No-AD7894ARZ-2REEL is the ±2.5 V variant (AD7894-3), supporting only bipolar input ranges. The unipolar 0 V to +2.5 V version is AD7894-2 (e.g., AD7894ARZ-2), which uses straight binary coding and different gain/offset error specifications. Using AD7894ARZ-2REEL with unipolar signals requires external level-shifting circuitry.
How does the auto power-down mode work in AD7894ARZ-2REEL?
In Mode 2, AD7894ARZ-2REEL enters power-down (20 µA IDD) automatically when CONVST remains low after conversion completes. A rising edge on CONVST triggers a ~5 µs wake-up period before the next conversion starts. This eliminates external control logic and reduces average power in low-duty-cycle applications like periodic sensor polling.
What is the maximum SCLK frequency supported by AD7894ARZ-2REEL?
The AD7894ARZ-2REEL supports up to 16 MHz SCLK, but system-level timing constraints apply: data access time t4 is 60 ns max, and setup/hold margins must be maintained. At 16 MHz, the 16-bit read takes 1.0 µs; combined with 5 µs conversion and 250 ns quiet time, the minimum throughput is 6.25 µs (160 kHz).
Is AD7894ARZ-2REEL pin-compatible with other AD7894 variants?
Yes-AD7894ARZ-2REEL shares identical SO-8 pinout and electrical interface with all AD7894 variants (e.g., AD7894ARZ-10, AD7894ARZ-2). However, input range, output coding (twos-complement vs. straight binary), and gain/offset error specs differ per variant; swapping requires firmware and signal conditioning verification.
AD7894ARZ-2REEL 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-2REEL FAQ
1.How can I place an order for AD7894ARZ-2REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7894ARZ-2REEL 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-2REEL reliable?
The price and inventory of AD7894ARZ-2REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7894ARZ-2REEL is usually 5 days.
3.What payment methods are accepted for AD7894ARZ-2REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7894ARZ-2REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7894ARZ-2REEL?
AD7894ARZ-2REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7894ARZ-2REEL 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-2REEL?
For technical support, including AD7894ARZ-2REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7894ARZ-2REEL requirements.
6.How does Aetrix verify that AD7894ARZ-2REEL is sourced from the original manufacturer or authorized distributors?
All AD7894ARZ-2REEL 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-2REEL meets industry standards.
7.What is the process for return or replacement of AD7894ARZ-2REEL?
All AD7894ARZ-2REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7894ARZ-2REEL, 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-2REEL part is unused and in its original packaging.
Return procedure for AD7894ARZ-2REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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