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Analog Devices Inc. AD7896BRZ-REEL
- Part No.:
- AD7896BRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7896BRZ-REEL.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,166
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Product details
Overview
AD7896BRZ-REEL from Analog Devices is a single-supply, 12-bit successive approximation ADC with 8 µs conversion time, integrated track-and-hold amplifier and on-chip clock, operating from 2.7 V to 5.5 V and delivering 100 kHz throughput in high-sampling mode. It uses VDD as its reference, accepts 0 V to VDD analog input, and consumes only 9 mW typical-enabling compact, low-power data acquisition in portable instrumentation.
For engineers reviewing the AD7896BRZ-REEL datasheet, AD7896BRZ-REEL pinout, AD7896BRZ-REEL application, or AD7896BRZ-REEL equivalent, key selection considerations include its 8-lead SOIC package, 2-wire serial interface (SCLK/SDATA), automatic power-down mode, ±1 LSB relative accuracy, and dynamic performance (70 dB SNR at 10 kHz).
Technical Context
The AD7896BRZ-REEL implements an R-2R ladder-based SAR architecture with laser-trimmed internal clock and monolithic track-and-hold. Its analog input path supports up to 1 kΩ source impedance and settles to 12-bit accuracy within 1.5 µs acquisition time.
It operates in two distinct modes: Mode 1 delivers 8 µs conversion with continuous operation; Mode 2 adds 6 µs wake-up latency before 8 µs conversion when CONVST remains low post-conversion, enabling ultra-low quiescent current (5 µA typ at 2.7 V) between samples.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes over full scale |
| Conversion Time | 8 µs (Mode 1) - enables 100 kHz sustained sampling with 400 ns inter-conversion guard band |
| Analog Input Range | 0 V to VDD - eliminates need for external reference or level-shifting circuitry |
| Supply Voltage | 2.7 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V logic domains |
| Power Dissipation | 9 mW typical at 5 V - enables battery-powered operation with minimal thermal load |
| SNR | 70 dB min at 10 kHz input - meets precision measurement requirements for sensor front-ends |
| Relative Accuracy | ±1 LSB max - ensures monotonicity and predictable code transitions across temperature |
Pinout & Package
AD7896BRZ-REEL is housed in an 8-lead, 0.150" wide SOIC package (JEDEC MS-012AC) with standard gull-wing lead form and RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog Input | Single-ended input accepting 0 V to VDD range; designed for ≤1 kΩ source impedance |
| VDD | Positive Supply | Primary power rail and internal reference source; also sets full-scale voltage |
| AGND | Analog Ground | Isolated return for track-and-hold, comparator, and DAC; must be star-connected to DGND at single point |
| SCLK | Serial Clock Input | Asynchronous master clock (≤10 MHz); falling edge clocks out SDATA bits |
| SDATA | Serial Data Output | 3-state output providing 16-bit frame (4 leading zeros + 12-bit result, MSB first) |
| DGND | Digital Ground | Return for digital I/O and logic; separation from AGND reduces noise coupling |
| CONVST | Convert Start | Edge-triggered control: falling edge initiates conversion; low hold enables auto-sleep mode |
| BUSY | Conversion Status | Open-drain active-high signal indicating conversion in progress; falls at completion |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Track-and-Hold | Acquires full-scale sine wave to 12-bit accuracy in ≤1.5 µs, eliminating external THA component |
| VDD-Referenced Conversion | Removes need for external precision reference, reducing BOM count and layout area by ~30% |
| Auto Power-Down Mode | Reduces IDD to 5 µA typ between conversions-critical for <100 µA average current budget systems |
| High-Speed Serial Interface | 2-wire SCLK/SDATA with 10 MHz max clock supports direct connection to SPI peripherals without glue logic |
| Monolithic SAR Architecture | R-2R ladder with laser-trimmed clock ensures stable 8 µs conversion time across voltage and temperature |
Applications
| Portable Data Loggers | Industrial Sensor Interfaces |
|---|---|
Use Scenario: Battery-powered environmental monitoring node acquiring temperature, humidity, and pressure at 10–50 Hz with 12-bit resolution. IC Role / Device Role / Timing Role: Primary ADC converting conditioned analog sensor outputs; triggered via microcontroller GPIO on CONVST. Use Value: 9 mW typical power and auto-sleep mode extend battery life beyond 1 year on two AA cells; VDD-referencing simplifies supply design. | Use Scenario: 4–20 mA loop-powered transmitter digitizing RTD or thermocouple signals in factory automation. IC Role / Device Role / Timing Role: Precision front-end ADC interfaced to isolated microcontroller via optocoupled SCLK/SDATA lines. Use Value: ±1 LSB relative accuracy and 70 dB SNR ensure compliance with IEC 61000-4-5 surge immunity and EN 61326-1 EMC requirements. |
| Medical Vital Sign Monitors | Test & Measurement Equipment |
Use Scenario: Wearable ECG patch sampling biopotential signals at 250–1000 Hz with low-noise analog front-end. IC Role / Device Role / Timing Role: High-fidelity ADC capturing differential leads; BUSY signal synchronizes sample capture to avoid timing jitter. Use Value: 1.5 µs track-and-hold acquisition time enables accurate sampling of fast transients; SOIC package supports compact PCB layout. | Use Scenario: Benchtop multimeter digitizing DC/AC voltage and current with 0.1% basic accuracy. IC Role / Device Role / Timing Role: Core ADC in dual-slope or SAR-based measurement engine; driven by precision timing controller. Use Value: 8 µs conversion time and 100 kHz throughput support rapid auto-ranging; 0–VDD input range accommodates programmable gain amplifier outputs. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 2.7–5.5 V supply, SPI-compatible 3-wire interface, no BUSY pin | Limited to lower-precision industrial controls where 12-bit resolution is not required | Select when cost sensitivity outweighs resolution needs and system can tolerate missing BUSY status feedback |
| MAX11131AUT+ | 12-bit, 1 MSPS, 2.7–3.6 V only, internal reference, SPI 4-wire interface | Requires external level-shifting for 5 V systems; higher speed but narrower supply range | Prefer for high-throughput, single-supply 3.3 V designs where 100 kHz is insufficient |
Compared with ADS7822U and MAX11131AUT+, the AD7896BRZ-REEL uniquely balances 12-bit precision, 100 kHz throughput, VDD-referencing, and BUSY signaling in an 8-pin SOIC-making it optimal for space-constrained, mixed-voltage industrial and portable systems requiring deterministic timing and low standby current.
Availability
AD7896BRZ-REEL is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, medical vital sign monitors, and test & measurement equipment requiring stable component supply across extended temperature ranges (0°C to +70°C).
Supply support for AD7896BRZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7896BRZ-REEL belongs to Analog Devices' legacy precision SAR ADC product line, engineered for low-power, space-efficient data acquisition in battery-operated and industrial environments where integration, reliability, and ease of use are critical.
FAQ
What is the maximum serial clock frequency supported by the AD7896BRZ-REEL?
The AD7896BRZ-REEL supports a maximum SCLK frequency of 10 MHz when operated at VDD = 5 V ±10%. At 2.7 V to 3.6 V, timing margins tighten-data access time increases to 100 ns, limiting practical SCLK to ≤6.5 MHz for reliable readout. The part requires 16 SCLK pulses per conversion result, so 10 MHz enables full 16-bit readout in 1.6 µs.
Does the AD7896BRZ-REEL require an external voltage reference?
No, the AD7896BRZ-REEL does not require an external voltage reference. Its internal reference is derived directly from the VDD supply, and the analog input range is specified as 0 V to VDD. This eliminates the need for external reference components, reducing bill-of-materials cost and PCB area while maintaining 12-bit linearity performance.
How does the automatic power-down mode function in the AD7896BRZ-REEL?
In automatic power-down mode (Mode 2), the AD7896BRZ-REEL enters low-current sleep after conversion completes-provided CONVST remains low. It wakes up 6 µs after the rising edge of the next CONVST pulse, then performs an 8 µs conversion. This reduces average supply current to 5 µA typ at 2.7 V, making AD7896BRZ-REEL ideal for intermittent-sampling applications like battery-powered sensors.
What is the meaning of the four leading zeros in the AD7896BRZ-REEL serial data frame?
The AD7896BRZ-REEL outputs a 16-bit serial frame consisting of four leading zeros followed by the 12-bit conversion result (MSB first). These zeros provide synchronization and timing margin for host processors, ensuring reliable capture of DB11 through DB0 even with variable SCLK edge alignment. The SDATA line is three-stated after the 16th falling SCLK edge.
Can the AD7896BRZ-REEL operate with a 3.3 V supply and still achieve full 12-bit performance?
Yes, the AD7896BRZ-REEL is fully specified for operation from 2.7 V to 5.5 V, including 3.3 V nominal supplies. At VDD = 3.3 V, it maintains 12-bit resolution, ±1 LSB relative accuracy, 70 dB SNR at 10 kHz, and 8 µs conversion time. The analog input range becomes 0 V to 3.3 V, and 1 LSB equals 0.81 mV-enabling direct interface with 3.3 V op-amp signal chains without level shifting.
AD7896BRZ-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:
- Active
- 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:
- -
AD7896BRZ-REEL FAQ
1.How can I place an order for AD7896BRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7896BRZ-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 AD7896BRZ-REEL reliable?
The price and inventory of AD7896BRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7896BRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7896BRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7896BRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7896BRZ-REEL?
AD7896BRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7896BRZ-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 AD7896BRZ-REEL?
For technical support, including AD7896BRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7896BRZ-REEL requirements.
6.How does Aetrix verify that AD7896BRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7896BRZ-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 AD7896BRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7896BRZ-REEL?
All AD7896BRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7896BRZ-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 AD7896BRZ-REEL part is unused and in its original packaging.
Return procedure for AD7896BRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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