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Analog Devices Inc. AD7893BR-2
- Part No.:
- AD7893BR-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7893BR-2.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,182
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Product details
Overview
AD7893BR-2 from Analog Devices is a 12-bit, serial-output analog-to-digital converter with on-chip track/hold amplifier, single +5 V supply operation, 6 µs conversion time, 0 V to +2.5 V unipolar input range, and straight binary output coding-designed for precision data acquisition in space-constrained industrial sensor interfaces.
For engineers reviewing the AD7893BR-2 datasheet, AD7893BR-2 pinout, AD7893BR-2 application, or AD7893BR-2 equivalent, this page delivers verified electrical specs, SOIC-8 package details, timing-critical interface guidance, and validated alternative options for embedded measurement systems requiring high DC accuracy and low power.
Technical Context
The AD7893BR-2 implements a successive-approximation ADC core with an R-2R ladder DAC, integrated laser-trimmed internal clock oscillator, and buffered on-chip track/hold amplifier optimized for 12-bit linearity at up to 117 kHz throughput. Its analog front-end accepts 0 V to +2.5 V inputs with ≤500 nA input current and requires an external +2.5 V reference applied to REF IN.
Control is edge-triggered via CONVST (rising edge initiates hold and conversion), while serial data is clocked out on SDATA using SCLK-16-bit frame (4 leading zeros + 12-bit result), MSB-first, valid on SCLK falling edge, with three-state disable after final bit. No BUSY or EOC signal is provided; timing coordination relies on fixed 6 µs conversion + 1.5 µs acquisition windows.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes over full operating range |
| Conversion Time | 6 µs max - enables 117 kHz maximum sampling rate with proper timing margins |
| Analog Input Range | 0 V to +2.5 V - unipolar range matched to +2.5 V reference; no external scaling required |
| Relative Accuracy | ±0.5 LSB max - ensures endpoint linearity within ±0.012% of full scale for precision measurements |
| Power Dissipation | 25 mW typical - supports battery-powered or thermally constrained embedded designs |
| Signal-to-(Noise+Distortion) | 72 dB min - meets 12-bit AC performance requirements at 10 kHz input frequency |
| Output Coding | Straight (natural) binary - simplifies firmware interpretation vs. two's complement |
Pinout & Package
AD7893BR-2 is housed in an 8-pin SOIC (SO-8) package, 3.9 mm × 4.9 mm body, 1.27 mm pitch, JEDEC MS-012 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Accepts buffered +2.5 V ±5% reference; gain errors scale with reference drift |
| 2 - VIN | Analog input channel | High-impedance input (≤500 nA bias) for 0 V to +2.5 V unipolar signals |
| 3 - AGND | Analog ground reference | Separate ground return for track/hold, comparator, and DAC sections |
| 4 - SCLK | Serial clock input | External clock up to 8.33 MHz; rising edge clocks data out, falling edge validates |
| 5 - SDATA | Serial data output | 16-bit frame (4 zeros + 12-bit result), MSB-first, three-stated after 16th falling edge |
| 6 - DGND | Digital ground reference | Isolated ground return for logic circuitry and serial interface |
| 7 - CONVST | Convert start trigger | Falling edge resets counter; rising edge initiates track-to-hold transition and conversion |
| 8 - VDD | Positive supply | +5 V ±5% supply powering all analog and digital blocks; 9 mA max IDD |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply 12-bit ADC in 8-pin SOIC | Eliminates need for dual supplies and external track/hold, reducing BOM count and PCB area |
| On-chip track/hold amplifier | Acquires input to 12-bit accuracy in ≤1.5 µs-enables accurate digitization of fast-changing sensor signals |
| High-speed serial interface (2-wire) | Reduces microcontroller GPIO usage and simplifies isolation compared to parallel bus implementations |
| LC2MOS process technology | Combines bipolar precision for analog accuracy with CMOS logic efficiency for low 25 mW power |
| Unipolar 0 V to +2.5 V input range | Matches standard voltage references (e.g., AD780) without level-shifting or attenuation networks |
Applications
| Industrial Process Monitoring | Portable Data Loggers |
|---|---|
Use Scenario: Continuous voltage monitoring of 4–20 mA loop transmitters conditioned to 0–2.5 V outputs in factory automation cabinets. IC Role / Device Role / Timing Role: Precision ADC capturing sensor-derived analog signals with minimal latency and guaranteed monotonicity. Use Value: ±0.5 LSB relative accuracy ensures <0.012% full-scale error across temperature, critical for calibration traceability. | Use Scenario: Battery-operated environmental sensor node measuring temperature, humidity, and pressure with microamp-level sleep current. IC Role / Device Role / Timing Role: Low-power, single-supply ADC enabling >1-year operation on coin-cell batteries while maintaining 12-bit resolution. Use Value: 25 mW typical power dissipation and no external components reduce system-level energy budget and thermal load. |
| Medical Instrumentation Front-End | Test & Measurement Equipment |
Use Scenario: Isolated biopotential signal conditioning in ECG/EEG modules where input swings 0–2.5 V after amplification and filtering. IC Role / Device Role / Timing Role: High-DC-accuracy ADC interfacing directly to precision op-amp outputs without additional buffering. Use Value: ≤500 nA input current prevents loading of high-Z sensor amplifier stages, preserving signal integrity. | Use Scenario: Modular benchtop DMM or oscilloscope auxiliary channel digitizing calibrated DC reference voltages. IC Role / Device Role / Timing Role: Serial-output ADC providing deterministic 6 µs conversion latency for synchronized multi-channel sampling. Use Value: Fixed 6 µs conversion time enables precise timing control in automated test sequences without software polling. |
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 SO-8 package and specs, but ±1 LSB relative accuracy (vs. ±0.5 LSB for AD7893BR-2) | Suitable for cost-sensitive industrial monitoring where 0.012% linearity is not mandatory | Select AD7893AR-2 when ±1 LSB accuracy suffices and lower unit cost is prioritized |
| ADS7822U | 12-bit, 200 kSPS, SPI interface, 2.7–5.25 V supply, no on-chip track/hold, requires external sample clock | Better speed and wider supply range, but adds external track/hold and timing complexity | Choose ADS7822U only if higher throughput (>117 kSPS) justifies added design effort and component count |
Compared with AD7893AR-2, AD7893BR-2 delivers tighter ±0.5 LSB linearity for metrology-grade applications; versus ADS7822U, it integrates track/hold and uses simpler 2-wire timing but trades off maximum sample rate and supply flexibility.
Availability
AD7893BR-2 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, medical instrumentation front-ends, and test & measurement equipment requiring stable component supply and long-term obsolescence management.
Supply support for AD7893BR-2 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 AD7893 product line delivers compact, single-supply 12-bit ADCs with integrated track/hold and serial interface-designed specifically for space- and power-constrained embedded measurement systems demanding DC precision and ease of integration.
FAQ
What is the reference voltage requirement for AD7893BR-2?
The AD7893BR-2 requires an external +2.5 V reference applied to the REF IN pin, with tolerance of ±5% (2.375 V to 2.625 V). The reference input is buffered on-chip with ≤1 µA input current. Reference accuracy directly impacts full-scale error-using a precision source like the AD780 ensures optimal performance. The AD7893BR-2 does not generate its own reference and cannot operate without this external +2.5 V supply.
Does AD7893BR-2 include an on-chip track/hold amplifier?
Yes, the AD7893BR-2 integrates a precision track/hold amplifier optimized for 12-bit accuracy. It acquires the VIN signal to within ±0.5 LSB in ≤1.5 µs after conversion ends or after a step input change. The track/hold transitions to hold mode on the rising edge of CONVST, and aperture delay is typically 15 ns. This eliminates the need for external track/hold circuitry in most applications using the AD7893BR-2.
What is the output data format of AD7893BR-2?
The AD7893BR-2 outputs 12-bit straight (natural) binary data, prefixed by four leading zeros for a total 16-bit serial frame. Data is MSB-first, clocked out on SDATA synchronized to SCLK rising edges, and valid on falling edges. After the 16th falling edge of SCLK, SDATA enters high-impedance (three-state) mode. This format simplifies firmware parsing compared to two's complement used in bipolar variants like AD7893-10.
Can AD7893BR-2 operate from a supply other than +5 V?
No-the AD7893BR-2 is specified only for +5 V ±5% (4.75 V to 5.25 V) operation. Absolute maximum ratings allow up to +7 V, but performance-including linearity, conversion time, and power dissipation-is guaranteed solely within the +5 V ±5% range. Operating outside this window may cause parametric degradation or functional failure. The AD7893BR-2 does not support 3.3 V or dual-supply configurations.
How is timing coordinated without a BUSY or EOC pin on AD7893BR-2?
The AD7893BR-2 provides no dedicated status pin; timing relies on fixed internal delays. Conversion always completes 6 µs after the rising edge of CONVST. To read data reliably, the serial interface must be activated ≥6 µs post-CONVST and completed ≥600 ns before the next CONVST rising edge. Common methods include software delay, using CONVST's falling edge as an interrupt, or generating a 6 µs-width square wave for CONVST-ensuring deterministic synchronization without polling.
AD7893BR-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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-2 FAQ
1.How can I place an order for AD7893BR-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7893BR-2 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-2 reliable?
The price and inventory of AD7893BR-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7893BR-2 is usually 5 days.
3.What payment methods are accepted for AD7893BR-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7893BR-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7893BR-2?
AD7893BR-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7893BR-2 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-2?
For technical support, including AD7893BR-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7893BR-2 requirements.
6.How does Aetrix verify that AD7893BR-2 is sourced from the original manufacturer or authorized distributors?
All AD7893BR-2 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-2 meets industry standards.
7.What is the process for return or replacement of AD7893BR-2?
All AD7893BR-2 units undergo pre-shipment inspection (PSI). If there is an issue with AD7893BR-2, 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-2 part is unused and in its original packaging.
Return procedure for AD7893BR-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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