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Analog Devices Inc. AD7893BR-2REEL7
- Part No.:
- AD7893BR-2REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7893BR-2REEL7.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,446
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Product details
Overview
AD7893BR-2REEL7 from Analog Devices is a 12-bit, serial-output analog-to-digital converter with 6 µs conversion time, single +5 V supply operation, and integrated track/hold amplifier. It supports 0 V to +2.5 V unipolar input range, straight binary output coding, and delivers 72 dB SNR at 10 kHz input - used in precision data acquisition systems for industrial sensors and portable instrumentation.
For engineers reviewing the AD7893BR-2REEL7 datasheet, AD7893BR-2REEL7 pinout, AD7893BR-2REEL7 application, or AD7893BR-2REEL7 equivalent, key selection criteria include its SOIC-8 package, ±1/2 LSB relative accuracy, 1.5 µs track/hold acquisition time, 25 mW typical power dissipation, and compatibility with microcontroller serial interfaces requiring minimal board space.
Technical Context
The AD7893BR-2REEL7 implements a successive-approximation ADC core with an on-chip R-2R ladder DAC and laser-trimmed internal clock oscillator. Its track/hold amplifier acquires signals to 12-bit accuracy within 1.5 µs and supports input frequencies beyond 58 kHz (Nyquist limit at 117 kHz sampling).
It uses a two-wire serial interface: SCLK clocks data out on rising edges, SDATA provides 16-bit frames (4 leading zeros + 12-bit result), with data valid on falling SCLK edges. The part requires an external +2.5 V reference (REF IN) and operates with AGND/DGND separation for noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes across full operating range |
| Conversion Time | 6 µs max - enables up to 117 kHz sustained sampling rate |
| Relative Accuracy | ±1/2 LSB max - ensures high endpoint linearity for calibration-sensitive applications |
| Signal-to-(Noise+Distortion) | 72 dB min at 10 kHz - meets precision measurement requirements for sensor front-ends |
| Analog Input Range | 0 V to +2.5 V - optimized for low-voltage, single-supply signal chains with rail-to-rail compatible sources |
| Power Dissipation | 25 mW typical - supports battery-powered and thermally constrained embedded designs |
| Reference Input | +2.5 V ±5% - external buffered reference required; gain errors scale directly with reference tolerance |
Pinout & Package
AD7893BR-2REEL7 is housed in an 8-pin SOIC (SO-8) package, 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Accepts buffered +2.5 V reference; input current ≤2 µA ensures minimal loading on precision references like AD780 |
| 2 - VIN | Analog input channel | High-impedance node (≤500 nA input current) for 0 V to +2.5 V unipolar signals; no external scaling resistors needed |
| 3 - AGND | Analog ground reference | Return path for track/hold, comparator, and DAC; must be separated from DGND to minimize digital noise coupling |
| 4 - SCLK | Serial clock input | Edge-triggered clock (max 8.33 MHz); rising edge clocks data out, falling edge validates SDATA; timing-critical for throughput |
| 5 - SDATA | Serial data output | Three-state CMOS output delivering 16-bit frame (4 zeros + 12-bit result); disabled after 16th SCLK falling edge |
| 6 - DGND | Digital ground reference | Return path for logic circuitry; must connect to system digital ground plane with low-inductance path |
| 7 - CONVST | Convert start input | Falling edge resets serial counter; rising edge initiates track→hold transition and starts conversion sequence |
| 8 - VDD | Positive supply | +5 V ±5% supply; powers analog and digital sections; IDD ≤9 mA ensures stable operation under full load |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply 12-bit ADC in SOIC-8 | Eliminates need for dual supplies and external track/hold ICs - reduces BOM count and PCB area by >40% vs discrete solutions |
| On-chip track/hold amplifier | Acquires full-scale sine waves to 12-bit accuracy in <1.5 µs - enables accurate digitization of dynamic sensor outputs without external components |
| High-speed serial interface | Two-wire (SCLK/SDATA) protocol compatible with standard microcontroller SPI peripherals - simplifies firmware integration and reduces GPIO usage |
| Unipolar 0 V to +2.5 V input range | Matches common low-voltage sensor outputs (e.g., 0–2.5 V pressure transducers) - avoids level-shifting circuitry and associated errors |
| LC2MOS process technology | Combines bipolar precision with CMOS logic density - achieves 72 dB SNR and ±1/2 LSB linearity while maintaining 25 mW power efficiency |
Applications
| Industrial Sensor Interface | Portable Data Logger |
|---|---|
Use Scenario: Digitizing output from 0–2.5 V bridge-based strain gauges in factory-floor condition monitoring systems. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor voltage with 12-bit resolution and 117 kHz sample rate; CONVST synchronized to PLC scan cycle. Use Value: ±1/2 LSB relative accuracy minimizes calibration drift over temperature; SOIC-8 footprint allows dense placement near sensor terminals. |
Use Scenario: Battery-powered environmental logger measuring temperature, humidity, and light intensity with microamp-level sleep current. IC Role / Device Role / Timing Role: Low-power ADC acquiring unipolar sensor outputs; track/hold acquisition time <1.5 µs enables fast wake-up and conversion before sleep re-entry. Use Value: 25 mW typical power dissipation extends battery life; serial interface reduces MCU pin count and simplifies PCB routing. |
| Medical Instrument Front-End | Test & Measurement Equipment |
Use Scenario: Signal conditioning stage in handheld ECG monitor digitizing amplified biopotential signals referenced to 0 V. IC Role / Device Role / Timing Role: Precision ADC converting filtered, amplified analog waveforms; REF IN driven by AD780 for stable 2.5 V reference. Use Value: 72 dB SNR ensures clean waveform capture at 10 kHz; straight binary coding simplifies real-time amplitude analysis in firmware. |
Use Scenario: Modular benchtop multimeter module requiring high DC accuracy and dynamic performance for AC/DC voltage measurements. IC Role / Device Role / Timing Role: Core ADC in auto-ranging subsystem; CONVST triggered by range-change logic to initiate synchronized conversion. Use Value: ±1/2 LSB relative accuracy supports 0.025% basic DCV accuracy; 6 µs conversion time enables rapid range settling and measurement throughput. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7893AR-2 | Same specs but plastic DIP (N-8) package; ±1 LSB relative accuracy; 70 dB SNR | Less suitable for automated assembly or high-density layouts due to through-hole packaging | Select AD7893AR-2 only if legacy DIP footprint or manual prototyping is required |
| ADS7822U | 12-bit, 200 kSPS, SPI-compatible, 2.7–5.25 V supply; no integrated track/hold; 0–VREF input range | Requires external track/hold for dynamic signals; higher speed but lower SNR (70 dB) | Choose ADS7822U when higher throughput is critical and track/hold can be added externally |
Compared with AD7893AR-2, AD7893BR-2REEL7 offers tighter ±1/2 LSB linearity and SOIC packaging for modern SMT production; versus ADS7822U, it integrates track/hold and delivers superior 72 dB SNR at the cost of lower maximum sample rate.
Availability
AD7893BR-2REEL7 is available at Aetrix Electronics and suitable for industrial sensor interface, portable data logging, medical instrument front-end, and test & measurement equipment requiring stable component supply and long-term manufacturability.
Supply support for AD7893BR-2REEL7 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 AD7893 product line delivers compact, single-supply 12-bit ADCs with integrated track/hold and serial interfaces - designed specifically for space-constrained, low-power, high-accuracy data acquisition in industrial, medical, and portable instrumentation.
FAQ
What is the input voltage range supported by the AD7893BR-2REEL7?
The AD7893BR-2REEL7 supports a unipolar analog input range of 0 V to +2.5 V. This is fixed for the "-2" variant and does not support bipolar or extended ranges. The input presents high impedance (<500 nA bias current), eliminating dynamic charging effects and enabling direct connection to low-output-impedance sensors without external buffering.
Does the AD7893BR-2REEL7 require an external reference voltage?
Yes, the AD7893BR-2REEL7 requires an external +2.5 V reference applied to the REF IN pin. The internal reference buffer accepts ±5% tolerance (2.375 V to 2.625 V), and reference accuracy directly impacts gain error - a 0.1% reference drift introduces ~0.1% full-scale error. Precision references such as the AD780 are recommended.
How is data read from the AD7893BR-2REEL7 via its serial interface?
Data is read using a 16-clock-cycle sequence on SCLK: the AD7893BR-2REEL7 outputs four leading zeros followed by the 12-bit conversion result (MSB first) on SDATA. Each bit is clocked out on the rising edge of SCLK and valid on the falling edge. After the 16th falling edge, SDATA enters high-impedance state.
What is the role of the CONVST pin on the AD7893BR-2REEL7?
The CONVST pin controls conversion timing: a rising edge initiates track-to-hold transition and starts the 6 µs conversion; a falling edge resets the internal serial counter. It can serve dual purpose - as conversion trigger and as an interrupt signal (e.g., falling edge notifies MCU that data is ready for read after 6 µs delay).
Is the AD7893BR-2REEL7 pin-compatible with other AD7893 variants?
Yes, all AD7893 variants including AD7893BR-2REEL7 share identical SOIC-8 pinout and electrical interface. However, input range, output coding (straight binary vs. two's complement), and accuracy grade differ between -2, -3, -5, and -10 versions - substituting variants requires verifying signal range compatibility and firmware handling of output format.
AD7893BR-2REEL7 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):
- 117k
- 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:
- -
AD7893BR-2REEL7 FAQ
1.How can I place an order for AD7893BR-2REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7893BR-2REEL7 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 AD7893BR-2REEL7 reliable?
The price and inventory of AD7893BR-2REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7893BR-2REEL7 is usually 5 days.
3.What payment methods are accepted for AD7893BR-2REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7893BR-2REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7893BR-2REEL7?
AD7893BR-2REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7893BR-2REEL7 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 AD7893BR-2REEL7?
For technical support, including AD7893BR-2REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7893BR-2REEL7 requirements.
6.How does Aetrix verify that AD7893BR-2REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7893BR-2REEL7 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 AD7893BR-2REEL7 meets industry standards.
7.What is the process for return or replacement of AD7893BR-2REEL7?
All AD7893BR-2REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7893BR-2REEL7, 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 AD7893BR-2REEL7 part is unused and in its original packaging.
Return procedure for AD7893BR-2REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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