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Analog Devices Inc. AD7896BR-REEL7
- Part No.:
- AD7896BR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7896BR-REEL7.pdf
- Description:
- 12-BIT SAR SERIAL ADC
- Quantity:
- Payment:
- Shipping:
Inventory:329
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Product details
Overview
AD7896BR-REEL7 from Analog Devices is a 12-bit successive approximation ADC with 8 µs conversion time, operating from a single 2.7 V to 5.5 V supply and delivering 100 kHz throughput. It integrates an on-chip track-and-hold amplifier, internal clock, and high-speed 2-wire serial interface (SCLK/SDATA), and accepts 0 V to VDD analog input - used as its own reference - making it suitable for compact, low-power data acquisition in portable instrumentation.
For engineers reviewing the AD7896BR-REEL7 datasheet, AD7896BR-REEL7 pinout, AD7896BR-REEL7 application, or AD7896BR-REEL7 equivalent, this page delivers verified specifications, SOIC-8 package mapping, real-world timing behavior (e.g., 14 µs Mode 2 conversion including wake-up), dynamic performance (70 dB SNR at 10 kHz), and validated alternatives for embedded sensor interface and battery-powered measurement systems.
Technical Context
The AD7896BR-REEL7 implements a laser-trimmed R-2R ladder SAR architecture with internal VDD-derived reference, eliminating external reference components. Its dual-mode operation includes high-sampling Mode 1 (8 µs conversion, BUSY-driven timing) and auto-sleep Mode 2 (14 µs total cycle, rising-edge wake-up).
Serial communication uses edge-triggered SCLK with SDATA valid on falling edges; 16-bit frame format includes four leading zeros followed by 12-bit straight-binary data. Track-and-hold acquisition time is 1.5 µs, and aperture delay is 15 ns - enabling accurate full-scale sine-wave sampling up to 50 kHz input bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes over full range; supports 4096 discrete levels for precision sensor digitization. |
| Conversion Time | 8 µs (Mode 1) / 14 µs (Mode 2) - defines minimum inter-conversion interval; Mode 2 includes 6 µs wake-up before 8 µs conversion. |
| Throughput Rate | 100 kHz maximum - achievable only with 10 MHz SCLK, 1.6 µs read time, and ≥400 ns hold before next CONVST. |
| Signal-to-(Noise + Distortion) | 70 dB min at fIN = 10 kHz - ensures usable dynamic range for audio-band and industrial signal conditioning. |
| Analog Input Range | 0 V to VDD - eliminates level-shifting circuitry; VDD serves as reference, simplifying BOM and layout. |
| Power Dissipation | 9 mW typical at VDD = 2.7 V - enables multi-hour operation on coin-cell batteries in handheld meters. |
| Differential Nonlinearity | ±1 LSB max - preserves monotonicity critical for closed-loop control feedback paths. |
Pinout & Package
AD7896BR-REEL7 is housed in an 8-lead SOIC (R-8) package, 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog input | Accepts 0 V to VDD unipolar signal; high-impedance input (±2 µA max) requires ≤1 kΩ source impedance for 1.5 µs settling. |
| VDD | Positive supply & reference | Single 2.7–5.5 V rail powers analog/digital sections and sets full-scale range; no external reference needed. |
| AGND | Analog ground | Separate ground return for track-and-hold, comparator, and DAC; must be star-connected to minimize noise coupling. |
| SCLK | Serial clock input | External clock up to 10 MHz; falling edge clocks out SDATA; t2/t3 ≥ 402 ns (VDD = 5 V) ensures reliable sampling. |
| SDATA | Serial data output | Three-state output providing 16-bit frame (4 zeros + 12-bit MSB-first binary); disabled after 16th SCLK falling edge. |
| DGND | Digital ground | Isolated ground for logic circuitry; must be connected to AGND at single point near VDD decoupling capacitor. |
| CONVST | Convert start trigger | Falling-edge initiates conversion and hold mode; low at end of conversion enables auto-sleep; rising edge wakes device in Mode 2. |
| BUSY | Conversion status indicator | Open-drain output high during conversion; falls low when result is latched and ready for serial read. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track-and-hold | Enables accurate sampling of fast-changing signals without external components; acquires to ±1/2 LSB in ≤1.5 µs. |
| VDD-referenced architecture | Removes need for precision external voltage reference, reducing component count and board area in space-constrained designs. |
| Auto power-down mode | Reduces IDD to 5 µA typ (VDD = 2.7 V) between conversions - extends battery life in intermittent-sampling applications. |
| High-speed serial interface | 2-wire (SCLK/SDATA) interface compatible with standard microcontroller SPI peripherals; no CS or framing overhead required. |
| SOIC-8 small-outline package | 8-pin, 150 mil wide SOIC footprint enables high-density PCB layouts while maintaining hand-solderability and test accessibility. |
Applications
| Portable Digital Multimeter | Industrial Temperature Sensor Interface |
|---|---|
Use Scenario: Battery-powered handheld DMM acquiring DC voltage, current, and resistance readings with 12-bit resolution and <100 ppm accuracy. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog front-end outputs; triggered by microcontroller via CONVST; serial data read via SCLK/SDATA during low-power sleep intervals. Use Value: Single-supply operation and integrated reference eliminate calibration drift from external references; 9 mW typical power enables >20-hour runtime on AA cells. |
Use Scenario: RTD or thermocouple signal conditioning module in PLC I/O rack, requiring stable 12-bit digitization across –40°C to +85°C. IC Role / Device Role / Timing Role: Precision ADC capturing filtered sensor outputs; operates in Mode 1 for continuous 100 kHz sampling during diagnostics; uses BUSY for interrupt-driven reads. Use Value: ±1 LSB differential nonlinearity ensures linearity-critical temperature curves remain within Class A tolerance; SOIC package withstands reflow and long-term thermal cycling. |
| Wireless Sensor Node ADC Front-End | Medical Patient Monitor Analog Input Stage |
Use Scenario: Ultra-low-power IoT node measuring environmental parameters (pressure, humidity) with duty-cycled acquisition every 5 seconds. IC Role / Device Role / Timing Role: ADC in auto-sleep Mode 2; woken by MCU GPIO pulse on CONVST; completes conversion and returns to 5 µA standby within 14 µs. Use Value: Power-down current of 5 µA typ (2.7 V) reduces average system current to sub-µA levels - extending CR2032 battery life to >5 years. |
Use Scenario: ECG or SpO₂ front-end digitizing biopotential signals with minimal added noise and guaranteed monotonicity. IC Role / Device Role / Timing Role: High-fidelity ADC capturing amplified analog waveforms; leverages 70 dB SNR and low THD (–80 dB) to preserve diagnostic signal integrity. Use Value: 1.5 µs track-and-hold acquisition time supports accurate sampling of fast-rising QRS complexes; straight-binary coding simplifies real-time DSP firmware. |
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 |
|---|---|---|---|
| AD7896AR-REEL7 | Same SOIC-8 package and timing, but ±1 LSB relative accuracy (vs. ±0.5 LSB for AD7896BR-REEL7). | Acceptable where cost sensitivity outweighs need for highest linearity in closed-loop control. | Select AD7896AR-REEL7 if ±1 LSB DNL suffices and B-version pricing is prohibitive. |
| ADS7822U | 12-bit, 200 kSPS, SPI-compatible, but requires external 2.5 V reference and 3.3 V supply only; no auto-sleep mode. | Better speed, but higher BOM cost and power; lacks integrated reference and power management. | Choose ADS7822U only when >100 kSPS is mandatory and external reference is already present. |
Compared with AD7896AR-REEL7, the AD7896BR-REEL7 offers tighter linearity for precision feedback loops; versus ADS7822U, it trades raw speed for lower system-level complexity, reduced power, and smaller footprint - making it optimal for size- and battery-constrained measurement nodes.
Availability
AD7896BR-REEL7 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and wireless monitoring systems requiring stable component supply, long-lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for AD7896BR-REEL7 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 Norwood, MA.
The AD7896BR-REEL7 belongs to Analog Devices' precision SAR ADC product line, designed specifically for space-constrained, low-power data acquisition systems where integration, single-supply operation, and guaranteed monotonicity are essential.
FAQ
What is the maximum sampling rate achievable with AD7896BR-REEL7?
The AD7896BR-REEL7 achieves a maximum throughput rate of 100 kHz under optimal conditions: 10 MHz SCLK, Mode 1 operation, 8 µs conversion, 1.6 µs serial read, and ≥400 ns hold time before next CONVST. This requires precise timing coordination - exceeding 100 kHz violates datasheet AC specifications and degrades SNR.
Does AD7896BR-REEL7 require an external voltage reference?
No, the AD7896BR-REEL7 uses VDD as its internal reference, supporting an analog input range of 0 V to VDD. This eliminates the need for external reference components, reducing BOM cost and PCB area - a key advantage confirmed in the AD7896 product highlights and functional block diagram.
How does the auto power-down mode work in AD7896BR-REEL7?
In Mode 2, the AD7896BR-REEL7 automatically enters power-down when CONVST remains low after conversion completion. It draws just 5 µA typical (VDD = 2.7 V). The rising edge of the next CONVST wakes it up in 6 µs, after which conversion begins - total cycle time is 14 µs. This behavior is explicitly defined in the Operating Modes section.
What is the serial data format output by AD7896BR-REEL7?
The AD7896BR-REEL7 outputs a 16-bit serial frame on SDATA: four leading zeros followed by the 12-bit conversion result in straight (natural) binary format, MSB first. The 16th falling edge of SCLK three-states SDATA. This format is documented in the Pin Function Descriptions and Serial Interface sections.
Can AD7896BR-REEL7 interface directly with standard SPI peripherals?
Yes - the AD7896BR-REEL7's 2-wire serial interface (SCLK and SDATA) is SPI-compatible: SCLK provides clocking, SDATA is MOSI-only output, and BUSY can serve as a ready/busy flag. No CS pin is needed; timing aligns with standard SPI modes using falling-edge sampling, as confirmed in Figure 4 and Timing Characteristics.
AD7896BR-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- AD7896
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Serial
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- 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:
- -
AD7896BR-REEL7 FAQ
1.How can I place an order for AD7896BR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7896BR-REEL7 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 AD7896BR-REEL7 reliable?
The price and inventory of AD7896BR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7896BR-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7896BR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7896BR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7896BR-REEL7?
AD7896BR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7896BR-REEL7 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 AD7896BR-REEL7?
For technical support, including AD7896BR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7896BR-REEL7 requirements.
6.How does Aetrix verify that AD7896BR-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7896BR-REEL7 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 AD7896BR-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7896BR-REEL7?
All AD7896BR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7896BR-REEL7, 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 AD7896BR-REEL7 part is unused and in its original packaging.
Return procedure for AD7896BR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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