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Analog Devices Inc. AD7894ARZ-3REEL7
- Part No.:
- AD7894ARZ-3REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7894ARZ-3REEL7.pdf
- Description:
- IC ADC 14BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,705
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Product details
Overview
AD7894ARZ-3REEL7 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 ±2.5 V bipolar analog input, delivers 77 dB SNR at 70 kHz input, and consumes 20 mW typical power. It is used in precision data acquisition systems requiring fast sampling and low power in space-constrained industrial instrumentation.
For engineers reviewing the AD7894ARZ-3REEL7 datasheet, AD7894ARZ-3REEL7 pinout, AD7894ARZ-3REEL7 application, or AD7894ARZ-3REEL7 equivalent, key selection considerations include its ±2.5 V input range, twos-complement output coding, 5 µs conversion time in Mode 1, SO-8 package compatibility, and automatic power-down capability for battery-sensitive designs.
Technical Context
The AD7894ARZ-3REEL7 implements a laser-trimmed internal clock driving a 14-bit R-2R ladder SAR core, with on-chip track/hold featuring 7.5 MHz small-signal bandwidth and 50 ps aperture jitter. Its analog front-end uses resistor scaling (R1 = R2 = 2 kΩ, R3 open) to support ±2.5 V input while maintaining high input impedance (≤1.5 mA max input current).
It supports two deterministic operating modes: Mode 1 (5 µs conversion, continuous operation) and Mode 2 (10 µs effective conversion including 5 µs wake-up, auto-sleep between conversions). Serial data output is 16-bit (two leading zeros + 14-bit result), synchronized to SCLK falling edges, 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 0.3 mV (±2.5 V range, 2.5 V reference) |
| Conversion Time | 5 µs max (Mode 1) - enables 160 kHz maximum throughput when combined with 1 µs read time and 250 ns quiet period |
| Input Voltage Range | ±2.5 V - compatible with standard industrial sensor outputs and op-amp rails without external level-shifting |
| SNR | 77 dB min (fIN = 70 kHz) - sufficient for 12.5+ ENOB in medium-bandwidth measurement applications |
| Power Dissipation | 20 mW typical - enables use in thermally constrained or battery-powered portable instruments |
| Reference Input | +2.5 V ±5% - requires external precision reference (e.g., AD780); gain error directly tracks reference accuracy |
| Differential Nonlinearity | –1 to +1.5 LSB max - ensures monotonicity and predictable code transitions across full scale |
Pinout & Package
AD7894ARZ-3REEL7 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; pins are numbered counterclockwise from top-left in top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Accepts buffered +2.5 V ±5% external reference; 1 µA max input current; determines full-scale gain and linearity |
| 2 - VIN | Analog input channel | ±2.5 V differential input range; high-impedance node after internal scaling resistors; no dynamic charging current |
| 3 - GND | Analog ground reference | Common return for track/hold, comparator, DAC, and digital logic; must be star-connected to minimize noise coupling |
| 4 - SCLK | Serial clock input | External clock up to 16 MHz; falling edge clocks out SDATA; minimum pulse width 31.25 ns high/low |
| 5 - SDATA | Serial data output | 16-bit stream (2 leading zeros + 14-bit twos-complement result); three-stated after 16th SCLK edge |
| 6 - BUSY | Conversion status indicator | Active-high open-drain output; asserts high on CONVST falling edge, deasserts low 5 µs later (Mode 1) |
| 7 - CONVST | Edge-triggered conversion start | Falling edge initiates track→hold transition and conversion; low at end of conversion enables auto-sleep mode |
| 8 - VDD | Positive supply | +5 V ±5%; supplies analog and digital sections; 5.5 mA max IDD; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply 14-bit ADC in SO-8 | Integrates SAR core, track/hold, clock, and serial interface in 8-pin package - eliminates need for discrete support components and saves PCB area |
| Auto power-down mode | Reduces IDD to 20 µA max between conversions - extends battery life in intermittent-sampling applications without firmware intervention |
| High-speed serial interface | Two-wire (SCLK/SDATA) with 16 MHz max clock - simplifies isolation and reduces GPIO count vs parallel interfaces |
| Bipolar ±2.5 V input range | Matches common industrial transducer outputs (e.g., strain gauges, accelerometers) without external signal conditioning |
| On-chip track/hold with 0.35 µs acquisition | Enables accurate digitization of signals up to ~100 kHz without external THA - critical for anti-aliasing compliance |
Applications
| Industrial Process Monitoring | Portable Test Equipment |
|---|---|
|
Use Scenario: Real-time monitoring of temperature, pressure, and flow sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC capturing ±2.5 V sensor outputs at up to 160 kHz; provides serial data to microcontroller via minimal GPIOs. Use Value: Eliminates external level-shifting and amplification stages due to native ±2.5 V input range and high input impedance. |
Use Scenario: Battery-powered handheld multimeters and oscilloscope probes requiring high-resolution DC/low-frequency AC measurements. IC Role / Device Role / Timing Role: Low-power 14-bit digitizer enabling >12-bit effective resolution with auto-sleep between manual trigger events. Use Value: 20 µA standby current and 20 mW active power allow >100-hour battery life in intermittent-use instruments. |
| Motor Control Feedback | Medical Sensor Interfaces |
|
Use Scenario: Sampling current shunt voltages and position encoder signals in servo drives for closed-loop torque/speed regulation. IC Role / Device Role / Timing Role: High-speed ADC synchronizing with PWM cycles; 5 µs conversion enables sub-microsecond current loop updates. Use Value: 7.5 MHz track/hold bandwidth and 50 ps aperture jitter preserve fidelity of fast transient motor currents. |
Use Scenario: Digitizing ECG, EEG, and bioimpedance signals in portable patient monitors where size and power are critical. IC Role / Device Role / Timing Role: Precision front-end ADC accepting ±2.5 V biopotential ranges; serial output eases integration with isolated microcontrollers. Use Value: Twos-complement coding and built-in track/hold simplify signal chain design versus external op-amp + ADC solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7894BRZ-3 | B-grade (±1.5 LSB INL vs A-grade ±2 LSB); identical pinout, timing, and electrical specs except tighter DC accuracy | Suitable for higher-accuracy metrology where ±1.5 LSB linearity is required; same SO-8 package and layout | Select AD7894BRZ-3 if system-level calibration is impractical and tighter initial linearity is mandatory. |
| ADS8325IPW | 16-bit, 100 kSPS, SPI interface, ±2.5 V input, but requires external reference and separate power supplies for analog/digital sections | Higher resolution but slower; needs additional LDOs and reference IC - increases BOM count and board area | Choose ADS8325IPW only when 16-bit resolution is essential and extra components/layout space are acceptable. |
Compared with AD7894BRZ-3, the AD7894ARZ-3REEL7 trades 0.5 LSB linearity for lower cost and broader availability; compared with ADS8325IPW, it offers faster throughput and simpler power architecture at the expense of 2-bit resolution.
Availability
AD7894ARZ-3REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, portable test equipment, and motor control feedback systems requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.
Supply support for AD7894ARZ-3REEL7 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 AD7894ARZ-3REEL7 belongs to Analog Devices' precision data acquisition ADC family, designed specifically for compact, low-power, high-speed industrial and instrumentation applications where integration, reliability, and ease of interface are critical.
FAQ
What is the input voltage range supported by the AD7894ARZ-3REEL7?
The AD7894ARZ-3REEL7 supports a bipolar ±2.5 V analog input range, optimized for industrial sensor outputs and op-amp rails. This range is fixed per variant - the "-3" suffix explicitly denotes ±2.5 V operation, distinct from the ±10 V (AD7894-10) or 0 V to +2.5 V (AD7894-2) versions. Input current remains ≤1.5 mA across the full range.
Does the AD7894ARZ-3REEL7 require an external voltage reference?
Yes, the AD7894ARZ-3REEL7 requires an external +2.5 V reference applied to the REF IN pin. The device includes on-chip buffering, but the reference must be stable and low-noise (e.g., AD780 or ADR421) - reference inaccuracies directly translate to gain error in the AD7894ARZ-3REEL7's transfer function.
How does the auto power-down mode work in the AD7894ARZ-3REEL7?
In auto power-down mode (Mode 2), the AD7894ARZ-3REEL7 enters low-power sleep automatically when CONVST remains low after conversion completes. It wakes up internally ~5 µs before the next CONVST falling edge. During sleep, IDD drops to 20 µA max, reducing total power consumption significantly in low-duty-cycle applications.
What is the serial interface protocol used by the AD7894ARZ-3REEL7?
The AD7894ARZ-3REEL7 uses a proprietary two-wire synchronous serial interface: SCLK (input) and SDATA (output). Data is clocked out on the falling edge of SCLK; each conversion yields 16 bits (two leading zeros followed by 14-bit twos-complement result). No chip select or frame sync is needed - timing is fully edge-driven.
Is the AD7894ARZ-3REEL7 pin-compatible with other variants in the AD7894 family?
Yes, all AD7894 variants - including AD7894ARZ-3REEL7, AD7894ARZ-10, and AD7894ARZ-2 - share identical SO-8 pinout, timing, and interface behavior. Only the input range, output coding (twos-complement for -3/-10, straight binary for -2), and internal scaling resistors differ; PCB layout and firmware can be reused across variants with minor configuration changes.
AD7894ARZ-3REEL7 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-3REEL7 FAQ
1.How can I place an order for AD7894ARZ-3REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7894ARZ-3REEL7 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-3REEL7 reliable?
The price and inventory of AD7894ARZ-3REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7894ARZ-3REEL7 is usually 5 days.
3.What payment methods are accepted for AD7894ARZ-3REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7894ARZ-3REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7894ARZ-3REEL7?
AD7894ARZ-3REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7894ARZ-3REEL7 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-3REEL7?
For technical support, including AD7894ARZ-3REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7894ARZ-3REEL7 requirements.
6.How does Aetrix verify that AD7894ARZ-3REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7894ARZ-3REEL7 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-3REEL7 meets industry standards.
7.What is the process for return or replacement of AD7894ARZ-3REEL7?
All AD7894ARZ-3REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7894ARZ-3REEL7, 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-3REEL7 part is unused and in its original packaging.
Return procedure for AD7894ARZ-3REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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