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Analog Devices Inc. AD7896AR-REEL
- Part No.:
- AD7896AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7896AR-REEL.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,895
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Product details
Overview
AD7896AR-REEL from Analog Devices is a single-supply, 12-bit successive approximation ADC with 8 µs conversion time, 100 kHz throughput rate, and integrated track-and-hold amplifier. It operates from 2.7 V to 5.5 V, uses VDD as its reference (no external reference required), and delivers serial output via a 2-wire interface-ideal for space-constrained data acquisition in portable instrumentation and sensor signal conditioning.
For engineers reviewing the AD7896AR-REEL datasheet, AD7896AR-REEL pinout, AD7896AR-REEL application, or AD7896AR-REEL equivalent, key selection criteria include unipolar 0 V to VDD input range, ±1 LSB relative accuracy (J-grade), automatic power-down mode, 70 dB SNR at 10 kHz input, and SOIC-8 package compatibility with legacy 8-pin ADC layouts.
Technical Context
The AD7896AR-REEL implements an R-2R ladder-based SAR architecture with laser-trimmed internal clock and on-chip track-and-hold. Its analog front-end accepts 0 V to VDD input with ≤1 kΩ source impedance and settles to 12-bit accuracy within 1.5 µs acquisition time.
It supports two deterministic operating modes: Mode 1 (8 µs conversion, high-throughput) and Mode 2 (14 µs total cycle including 6 µs wake-up, auto-sleep). Serial data output is straight binary, 16-bit frame (4 leading zeros + 12-bit result), clocked on SCLK falling edge with guaranteed 10 ns hold time and 60–110 ns access time depending on supply voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees monotonic transfer function with no missing codes over full temperature range. |
| Conversion Time | 8 µs (Mode 1) - enables 100 kHz sustained sampling when paired with 10 MHz SCLK and proper timing margining. |
| Supply Range | 2.7 V to 5.5 V - allows direct interfacing with 3.3 V or 5 V logic domains without level-shifting. |
| SNR | 70 dB min @ 10 kHz input - sufficient for 11.3 ENOB in precision DC/low-frequency AC measurement. |
| Power Dissipation | 9 mW typical @ 2.7 V - enables battery operation with <5 µA standby current in auto-sleep mode. |
| Analog Input Range | 0 V to VDD - eliminates need for external reference or input scaling circuitry in unipolar systems. |
| Relative Accuracy | ±1 LSB max (J-grade) - ensures end-point linearity error remains under ±0.024% of full scale. |
Pinout & Package
AD7896AR-REEL is housed in an 8-lead, 0.150" wide SOIC package (JEDEC MS-012AC), RoHS-compliant and tape-and-reel packaged (REEL suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog input | Accepts unipolar 0 V to VDD signal; requires ≤1 kΩ source impedance for full 12-bit settling in 1.5 µs. |
| VDD | Positive supply & reference | Single 2.7–5.5 V rail powers digital/analog sections and serves as ADC reference-no external REF needed. |
| AGND | Analog ground | Independent return for track-and-hold, comparator, and DAC; must be separated from DGND at single point. |
| SCLK | Serial clock input | External clock up to 10 MHz; falling edge clocks out SDATA; must go low after read completion. |
| SDATA | Serial data output | 3-state output delivering 16-bit frame (4 zeros + 12-bit result); data valid 10 ns after SCLK falling edge. |
| DGND | Digital ground | Return path for digital logic; isolated from AGND to minimize noise coupling into analog section. |
| CONVST | Convert start | Edge-triggered input; falling edge initiates conversion and hold mode; low state at completion enables auto-sleep. |
| BUSY | Conversion status | Open-drain output high during conversion; falling edge signals data ready in output register. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track-and-hold | Acquires 12-bit accuracy in ≤1.5 µs, enabling full-scale sine wave digitization up to 50 kHz input bandwidth. |
| Self-contained reference | VDD used as reference eliminates external voltage reference IC, reducing BOM count and PCB area by ~30% vs. REF-dependent ADCs. |
| Auto power-down mode | Reduces IDD to 5 µA typ (2.7 V) between conversions-critical for >1-year battery life in intermittent-sampling applications. |
| High-speed serial interface | 2-wire (SCLK/SDATA) with 10 MHz max clock supports microcontroller GPIO bit-banging without dedicated SPI peripheral. |
| SOIC-8 footprint | Direct drop-in replacement for legacy 8-pin ADCs (e.g., AD7890, MAX116); compatible with standard pick-and-place equipment. |
Applications
| Portable Data Loggers | Industrial Sensor Interfaces |
|---|---|
|
Use Scenario: Battery-powered environmental monitors acquiring temperature, humidity, and pressure from analog sensors at 10–100 Hz. IC Role / Device Role / Timing Role: ADC digitizes conditioned sensor outputs; CONVST triggers periodic conversions; BUSY synchronizes MCU sleep/wake cycles. Use Value: 9 mW typical power and auto-sleep mode extend AA battery life beyond 2 years; SOIC-8 simplifies layout in compact enclosures. |
Use Scenario: 4–20 mA loop-powered transmitters converting RTD or strain gauge signals for PLC analog inputs. IC Role / Device Role / Timing Role: ADC provides isolated, calibrated digitization; VDD-referenced input matches industrial 3.3 V/5 V supply rails; serial interface minimizes isolation component count. Use Value: ±1 LSB relative accuracy ensures <0.025% system error; 0 V to VDD input range eliminates level-shifting for 0–5 V sensor outputs. |
| Medical Instrumentation | Test & Measurement Front Ends |
|
Use Scenario: Handheld ECG or pulse oximeter units digitizing low-noise biopotential signals with minimal power draw. IC Role / Device Role / Timing Role: ADC performs high-fidelity sampling with 70 dB SNR; track-and-hold rejects switching noise from digital subsystems; SCLK/SDATA reduce routing complexity in dense analog sections. Use Value: 1.5 µs acquisition time supports anti-alias filtering with modest RC roll-off; 12-bit resolution meets IEC 60601-2-27 dynamic range requirements. |
Use Scenario: Benchtop multimeters and oscilloscope auxiliary channels requiring stable, low-drift DC measurement. IC Role / Device Role / Timing Role: ADC serves as precision DC digitizer; unipolar input range matches common signal conditioning outputs; serial interface enables calibration data storage in host MCU flash. Use Value: ±1 LSB linearity error contributes <±0.024% gain error-within Class II DMM accuracy budgets; SOIC-8 allows rework-friendly prototyping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7896JRZ-REEL | J-grade (0°C to +70°C) vs. AR-grade (–40°C to +85°C); identical electrical specs and SOIC-8 package. | Commercial temperature range only; unsuitable for industrial or automotive ambient conditions. | Select AD7896JRZ-REEL only for cost-sensitive, indoor-use applications where extended temperature operation is unnecessary. |
| MAX1166BCAP+ | 12-bit, 100 kSPS, but requires external reference; 10-pin µMAX package (not pin-compatible); higher 12 mW power. | Lacks integrated reference and auto-sleep; demands additional components for VREF and power management. | Choose MAX1166BCAP+ only if board space permits larger package and system already includes precision reference infrastructure. |
Compared with AD7896AR-REEL, the AD7896JRZ-REEL offers identical performance at lower cost but sacrifices industrial temperature capability, while the MAX1166BCAP+ increases design complexity with external reference dependency and higher quiescent power-making AD7896AR-REEL optimal for compact, low-power, wide-temperature embedded ADC needs.
Availability
AD7896AR-REEL is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and medical device signal chains requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7896AR-REEL 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.
The AD7896 belongs to Analog Devices' precision data acquisition ADC family, designed specifically for low-power, single-supply, space-constrained applications where integration of reference, track-and-hold, and serial interface in an 8-pin package delivers system-level simplification.
FAQ
What is the maximum sampling rate achievable with AD7896AR-REEL?
The AD7896AR-REEL achieves a maximum throughput rate of 100 kHz in Mode 1 operation. This requires an SCLK frequency of 10 MHz (at 5 V), 8 µs conversion time, 1.6 µs serial read (16 clocks), and 400 ns minimum inter-conversion gap for track-and-hold settling. At lower SCLK frequencies or in Mode 2 (auto-sleep), the effective rate decreases due to longer wake-up and conversion latency.
Does AD7896AR-REEL require an external voltage reference?
No, AD7896AR-REEL does not require an external voltage reference. It uses VDD as its internal reference, supporting an analog input range of 0 V to VDD. This eliminates the need for external reference ICs, reduces component count, and simplifies layout-particularly valuable in size- and cost-sensitive designs.
What is the meaning of the "AR" grade in AD7896AR-REEL?
The "AR" grade denotes the industrial temperature range: –40°C to +85°C. This distinguishes AD7896AR-REEL from the J-grade (0°C to +70°C) and S-grade (–55°C to +125°C) variants. All grades share identical electrical specifications except for temperature-limited parameters like power supply current and timing characteristics across their respective ranges.
Can AD7896AR-REEL interface directly with a 3.3 V microcontroller?
Yes, AD7896AR-REEL interfaces directly with 3.3 V microcontrollers. Its digital inputs accept VINH ≥ 2.0 V (min) at VDD = 2.7–3.6 V, and its SDATA output drives VOH ≥ 2.4 V (min) at ISOURCE = 400 µA-fully compatible with standard 3.3 V CMOS logic levels without level shifters.
How does the auto power-down mode function in AD7896AR-REEL?
In AD7896AR-REEL, auto power-down activates when CONVST remains low after conversion completes (BUSY goes low). The device enters ultra-low-current sleep (<5 µA typ at 2.7 V) until the next rising edge of CONVST, which triggers a 6 µs wake-up before conversion begins. This mode cuts average power in low-duty-cycle applications-e.g., 10 Hz sampling draws just ~0.9 µW average.
AD7896AR-REEL 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:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- 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:
- Supply
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7896AR-REEL FAQ
1.How can I place an order for AD7896AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7896AR-REEL 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 AD7896AR-REEL reliable?
The price and inventory of AD7896AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7896AR-REEL is usually 5 days.
3.What payment methods are accepted for AD7896AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7896AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7896AR-REEL?
AD7896AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7896AR-REEL 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 AD7896AR-REEL?
For technical support, including AD7896AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7896AR-REEL requirements.
6.How does Aetrix verify that AD7896AR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7896AR-REEL 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 AD7896AR-REEL meets industry standards.
7.What is the process for return or replacement of AD7896AR-REEL?
All AD7896AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7896AR-REEL, 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 AD7896AR-REEL part is unused and in its original packaging.
Return procedure for AD7896AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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