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Analog Devices Inc. AD7893BR-5
- Part No.:
- AD7893BR-5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7893BR-5.pdf
- Description:
- IC ADC 12BIT SRL T/H LP 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,641
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Product details
Overview
AD7893BR-5 from Analog Devices is a 12-bit, serial-output analog-to-digital converter (ADC) with 6 µs conversion time, single +5 V supply operation, and 0 V to +5 V unipolar input range. It integrates an on-chip track/hold amplifier, internal clock, and high-speed two-wire serial interface (SCLK/SDATA), and is housed in an 8-pin SOIC package. It delivers ±1/2 LSB relative accuracy and 72 dB SNR for precision data acquisition in industrial sensor interfaces and portable instrumentation.
For engineers reviewing the AD7893BR-5 datasheet, AD7893BR-5 pinout, AD7893BR-5 application, or AD7893BR-5 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with functional distinctions, and supply support details for volume procurement and BOM continuity.
Technical Context
The AD7893BR-5 implements a successive-approximation ADC core with R-2R ladder architecture, laser-trimmed internal clock, and on-chip track/hold amplifier optimized for 12-bit accuracy at up to 117 kHz throughput. Its analog front-end supports 0 V to +5 V input via a 9 kΩ input resistance and buffered 2.5 V reference input (±5% tolerance).
Control is edge-triggered: conversion initiates on the rising edge of CONVST; serial data output (straight binary coding) is clocked out on SCLK rising edges, with 16-bit frames (4 leading zeros + 12-bit result) valid on falling SCLK edges. No busy/status pin is provided-timing coordination relies on fixed 6 µs conversion + 600 ns acquisition guard band.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes; sufficient for 1 part in 4096 amplitude discrimination. |
| Conversion Time | 6 µs max - enables 117 kHz maximum sampling rate when paired with 1.5 µs track/hold acquisition. |
| Analog Input Range | 0 V to +5 V - unipolar straight-binary output; compatible with standard microcontroller I/O voltage domains. |
| Relative Accuracy | ±1/2 LSB max - ensures monotonicity and <0.012% full-scale linearity error for calibration-sensitive systems. |
| Signal-to-(Noise+Distortion) | 72 dB min - supports >11.6 effective bits (ENOB) at 10 kHz input, critical for dynamic signal fidelity. |
| Power Dissipation | 25 mW typical - enables battery-powered or thermally constrained designs without active cooling. |
| Reference Input | 2.375 V to 2.625 V - requires stable +2.5 V source (e.g., AD780); gain errors scale directly with reference drift. |
Pinout & Package
AD7893BR-5 is packaged in an 8-pin Small Outline IC (SOIC) with 1.27 mm pitch, JEDEC MS-012AC compliant, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Buffered, low-input-current (≤2 µA) node requiring stable +2.5 V ±5%; reference errors directly cause gain error. |
| 2 - VIN | Analog input channel | Accepts 0 V to +5 V unipolar signals with 9 kΩ input resistance; no dynamic charging current due to high-Z track/hold front-end. |
| 3 - AGND | Analog ground reference | Separate ground return for track/hold, comparator, and DAC; must be star-connected to minimize noise coupling into conversion path. |
| 4 - SCLK | Serial clock input | Asynchronous external clock (up to 8.33 MHz); rising edge clocks out SDATA; falling edge validates data; must go low post-read. |
| 5 - SDATA | Serial data output | Three-state, MSB-first output delivering 16-bit frame (4 zeros + 12-bit result); disabled on 16th SCLK falling edge. |
| 6 - DGND | Digital ground reference | Isolated ground for logic circuitry; must be connected to AGND at single point near device to prevent digital noise injection. |
| 7 - CONVST | Convert start trigger | Falling edge resets serial counter; rising edge initiates track→hold transition and starts 6 µs conversion; used as timing anchor for read synchronization. |
| 8 - VDD | Positive supply | +5 V ±5% supply; powers analog and digital sections; 9 mA max IDD ensures compatibility with standard LDOs. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply 12-bit ADC in 8-pin SOIC | Eliminates need for dual ±15 V supplies and external track/hold; reduces PCB area by >40% vs. discrete solutions. |
| On-chip track/hold with 1.5 µs acquisition | Enables accurate digitization of 58 kHz+ input signals without external components; removes aperture jitter dependency on external timing. |
| High-speed two-wire serial interface | Reduces microcontroller GPIO usage to only two pins (SCLK/SDATA); eliminates parallel bus routing and associated skew/timing constraints. |
| Straight binary output coding | Direct compatibility with unsigned integer arithmetic in firmware; avoids sign-extension complexity required for two's complement formats. |
| LC2MOS process technology | Combines bipolar precision (for ADC core) with CMOS logic efficiency; achieves 25 mW typical power at full performance. |
Applications
| Industrial Process Monitoring | Portable Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of 4–20 mA loop outputs, thermocouple voltages, and pressure transducer signals in factory-floor PLC modules. IC Role / Device Role / Timing Role: Primary ADC converting conditioned analog sensor outputs to digital values synchronized to programmable scan rates up to 117 kHz. Use Value: ±1/2 LSB linearity and 72 dB SNR ensure <0.025% measurement uncertainty over temperature, meeting ISA-S50.1 industrial accuracy requirements. |
Use Scenario: Battery-powered environmental sensors logging temperature, humidity, and air quality over multi-day deployments. IC Role / Device Role / Timing Role: Low-power ADC acquiring sensor data at 1–10 kHz rates, triggered by MCU sleep/wake cycles to minimize active time. Use Value: 25 mW typical power and single +5 V operation extend battery life beyond 6 months using two AA cells; SOIC package enables compact 2-layer PCB layout. |
| Medical Instrumentation Front-End | Test & Measurement Equipment |
Use Scenario: ECG and EEG signal conditioning in handheld diagnostic devices where size and power are critical. IC Role / Device Role / Timing Role: High-fidelity digitizer capturing biopotential waveforms with minimal added noise or distortion before digital filtering. Use Value: –80 dB THD and 72 dB SNR preserve small-signal integrity (e.g., 10 µV ECG peaks) without requiring post-acquisition correction algorithms. |
Use Scenario: Modular benchtop instruments requiring fast, repeatable DC and AC parameter measurements across multiple channels. IC Role / Device Role / Timing Role: Precision ADC in automated test equipment (ATE) channel cards, interfacing with FPGA-based control and memory buffers. Use Value: 6 µs conversion time and deterministic serial timing enable tight synchronization across 8+ channels with <10 ns inter-channel skew. |
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-5 | Same electrical specs but plastic DIP (N-8) package; ±1 LSB relative accuracy vs. ±1/2 LSB for BR-5. | Preferred for through-hole prototyping or legacy board rework; lacks SOIC thermal and density advantages. | Select AD7893AR-5 only if DIP footprint is required; BR-5 is superior for production SOIC layouts. |
| ADS7822U | 12-bit, 200 kSPS, SPI-compatible, but requires external reference and has no integrated track/hold; 3.3 V or 5 V supply. | Better suited for high-throughput, low-voltage systems where external signal conditioning is already present. | Choose ADS7822U when higher speed or 3.3 V operation is mandatory; AD7893BR-5 remains optimal for self-contained, low-component-count 5 V designs. |
Compared with AD7893AR-5, the AD7893BR-5 offers tighter linearity (±1/2 LSB) and surface-mount reliability; compared with ADS7822U, it provides integrated track/hold and reference buffering-reducing BOM count by three components-but trades off maximum sample rate.
Availability
AD7893BR-5 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, long-term lifecycle support, and traceable sourcing.
Supply support for AD7893BR-5 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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7893BR-5 belongs to Analog Devices' precision data acquisition product line, designed specifically for space-constrained, low-power, single-supply systems requiring integrated track/hold and serial interface functionality without external support components.
FAQ
What is the input voltage range supported by the AD7893BR-5?
The AD7893BR-5 supports a unipolar analog input range of 0 V to +5 V. This is distinct from other variants like AD7893BR-10 (±10 V) or AD7893BR-3 (±2.5 V). The input resistance is specified at 9 kΩ minimum, and the device uses straight binary output coding aligned to this range. Operation outside this range risks damage or invalid conversion results.
Does the AD7893BR-5 require an external reference voltage?
Yes, the AD7893BR-5 requires an external +2.5 V reference applied to the REF IN pin. The reference input is buffered on-chip with ≤2 µA input current, and the device is specified for 2.375 V to 2.625 V (±5%). Using a precision reference such as the AD780 ensures gain accuracy; reference drift directly contributes to full-scale error in the AD7893BR-5.
How is data read from the AD7893BR-5, and what is the serial format?
Data is read via a two-wire serial interface: SCLK (input) and SDATA (output). Sixteen clock pulses are required per conversion, yielding a frame of four leading zeros followed by the 12-bit straight binary result (MSB first). Data is clocked out on SCLK rising edges and valid on falling edges. The SDATA line is three-stated after the 16th falling SCLK edge.
What is the conversion timing relationship between CONVST and data availability for the AD7893BR-5?
Conversion begins on the rising edge of CONVST and completes exactly 6 µs later. To meet datasheet specifications, the serial read must not occur during conversion or within 600 ns before the next CONVST rising edge. Thus, the earliest safe read start is 6 µs after CONVST, and the latest safe read completion is 600 ns before the subsequent CONVST edge-enabling up to 117 kHz sustained throughput.
Is the AD7893BR-5 pin-compatible with other AD7893 variants?
Yes, all AD7893 variants-including AD7893BR-5, AD7893BR-10, AD7893BR-3, and AD7893BR-2-share identical 8-pin SOIC pinouts and logic-level timing. However, input ranges, output coding (straight binary vs. two's complement), and DC accuracy (±1/2 LSB vs. ±1 LSB) differ. Swapping variants requires firmware updates to handle coding format and range scaling, but no PCB change is needed.
AD7893BR-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 117k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7893BR-5 FAQ
1.How can I place an order for AD7893BR-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7893BR-5 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-5 reliable?
The price and inventory of AD7893BR-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7893BR-5 is usually 5 days.
3.What payment methods are accepted for AD7893BR-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7893BR-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7893BR-5?
AD7893BR-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7893BR-5 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-5?
For technical support, including AD7893BR-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7893BR-5 requirements.
6.How does Aetrix verify that AD7893BR-5 is sourced from the original manufacturer or authorized distributors?
All AD7893BR-5 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-5 meets industry standards.
7.What is the process for return or replacement of AD7893BR-5?
All AD7893BR-5 units undergo pre-shipment inspection (PSI). If there is an issue with AD7893BR-5, 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-5 part is unused and in its original packaging.
Return procedure for AD7893BR-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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