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Analog Devices Inc. AD7893BRZ-10
- Part No.:
- AD7893BRZ-10
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7893BRZ-10.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,398
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Product details
Overview
AD7893BRZ-10 from Analog Devices is a 12-bit successive-approximation ADC with ±10 V bipolar input range, 6 µs conversion time, on-chip track/hold amplifier, and high-speed two-wire serial interface (SCLK/SDATA), operating from a single +5 V supply and consuming 25 mW typical power. It is used in precision data acquisition systems requiring fast sampling of industrial sensor signals.
For engineers reviewing the AD7893BRZ-10 datasheet, AD7893BRZ-10 pinout, AD7893BRZ-10 application, or AD7893BRZ-10 equivalent, key selection considerations include its ±10 V input range, 70 dB SNR at 10 kHz, ±1 LSB relative accuracy, SOIC-8 package, and twos-complement output coding - all critical for embedded instrumentation and motor control feedback loops.
Technical Context
The AD7893BRZ-10 implements a laser-trimmed internal clock driving a 12-bit R-2R ladder DAC-based SAR core, with integrated track/hold acquiring to ±1/2 LSB in ≤1.5 µs. Its analog front-end includes resistor-scaling network (R1=30 kΩ, R2=7.5 kΩ, R3=10 kΩ) enabling ±10 V input while maintaining 16 kΩ minimum input resistance.
Timing is edge-triggered: conversion initiates on rising edge of CONVST; serial read requires 16 SCLK pulses (4 leading zeros + 12-bit result), with data valid on falling SCLK edge and SDATA three-stated after 16th falling edge. No BUSY or EOC signal is provided - synchronization relies on fixed 6 µs conversion time or CONVST edge re-use as interrupt.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes; supports 4096 discrete levels across full-scale range. |
| Input Range | ±10 V - enables direct interfacing with industrial ±10 V sensors without external scaling. |
| Conversion Time | 6 µs max - allows maximum throughput of 117 kHz when combined with 1.92 µs serial read and 600 ns acquisition guard band. |
| SNR | 70 dB min at fIN = 10 kHz - sufficient for 11.3 effective bits in audio and vibration monitoring applications. |
| Relative Accuracy | ±1 LSB max - ensures monotonicity and <0.025% full-scale linearity error over temperature. |
| Power Dissipation | 25 mW typical at +5 V - enables use in thermally constrained or battery-backed data loggers. |
| Output Coding | Twos-complement - simplifies signed arithmetic in DSP-based control algorithms without software sign extension. |
Pinout & Package
AD7893BRZ-10 is housed in an 8-pin SOIC (SO-8) package, 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant, with exposed pad not present. Pin 1 is REF IN, pin 8 is VDD; pin numbering follows standard SOIC top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Accepts buffered +2.5 V ±5% reference; gain/offset errors scale directly with reference drift. |
| 2 - VIN | Analog input channel | ±10 V input range with 16 kΩ min input resistance; compatible with legacy industrial transducers. |
| 3 - AGND | Analog ground reference | Separate from DGND to minimize digital noise coupling into sensitive analog front-end. |
| 4 - SCLK | Serial clock input | Edge-triggered clock up to 8.33 MHz; rising edge clocks out data, falling edge validates it. |
| 5 - SDATA | Serial data output | 16-bit frame (4 zeros + 12-bit twos-complement result); three-stated after 16th falling SCLK edge. |
| 6 - DGND | Digital ground reference | Return path for logic I/O; must be connected to system digital ground plane with low-inductance trace. |
| 7 - CONVST | Convert start input | Falling edge resets serial counter; rising edge triggers track-to-hold transition and conversion start. |
| 8 - VDD | Positive supply | +5 V ±5%; powers analog and digital sections; decoupling capacitor required within 1 cm. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Operates from +5 V only - eliminates need for dual-rail supplies in portable or space-constrained systems. |
| Integrated track/hold | Acquires ±10 V signals to 12-bit accuracy in ≤1.5 µs - removes requirement for external THA in high-throughput DAQ designs. |
| High-speed serial interface | Two-wire (SCLK/SDATA) with 16-bit deterministic timing - reduces PCB routing complexity vs parallel bus interfaces. |
| LC2MOS process technology | Combines precision bipolar analog circuitry with low-power CMOS logic - achieves 70 dB SNR with 25 mW consumption. |
| Bipolar input scaling | On-chip resistor network sets ±10 V range - avoids external op-amp level-shifting and associated gain/phase errors. |
Applications
| Industrial Process Monitoring | Motor Control Feedback |
|---|---|
Use Scenario: Continuous sampling of ±10 V analog outputs from pressure, temperature, and flow transmitters in PLC I/O modules. IC Role / Device Role / Timing Role: Primary ADC capturing sensor data at up to 117 kHz with deterministic 6 µs latency for real-time loop closure. Use Value: Eliminates external signal conditioning; ±1 LSB linearity ensures calibrated measurement integrity across 40+ year field deployments. | Use Scenario: Acquisition of back-EMF or current-sense signals in servo drives using ±10 V isolated amplifiers. IC Role / Device Role / Timing Role: High-fidelity analog front-end digitizing motor phase currents with minimal aperture jitter (<15 ns). Use Value: Twos-complement output enables direct signed math in FOC algorithms; SOIC-8 footprint eases thermal management in compact drive PCBs. |
| Portable Test Equipment | Automated Calibration Systems |
Use Scenario: Battery-powered handheld oscilloscopes and multimeters requiring low-power, high-accuracy DC/AC sampling. IC Role / Device Role / Timing Role: Core ADC delivering 12-bit resolution with 25 mW power budget and no external clock source needed. Use Value: Integrated track/hold and internal oscillator reduce BOM count by 3 components versus discrete solutions. | Use Scenario: Automated test fixtures verifying sensor linearity and offset across temperature using programmable ±10 V stimulus. IC Role / Device Role / Timing Role: Reference-grade digitizer referenced to AD780 +2.5 V source for <±0.025% full-scale metrology. Use Value: 70 dB SNR and ±1 LSB relative accuracy meet ANSI/NCSL Z540 calibration traceability requirements. |
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 |
|---|---|---|---|
| AD7893ARZ-10 | Same electrical specs; plastic DIP (N-8) package instead of SOIC; higher θJA (130°C/W vs 170°C/W) | Preferred for through-hole prototyping or legacy board upgrades where SOIC rework is impractical | Select AD7893ARZ-10 only if manual assembly or socket-based testing is required. |
| ADS7822U | 12-bit, 200 kSPS, SPI interface, 2.7–5.25 V supply; no on-chip track/hold; requires external reference | Suitable for lower-cost, lower-power systems where ±10 V input is scaled externally and timing jitter <5 ns is not critical | Choose ADS7822U only when supply voltage flexibility and SPI compatibility outweigh need for integrated track/hold and bipolar input. |
Compared with AD7893ARZ-10 and ADS7822U, the AD7893BRZ-10 uniquely combines ±10 V direct input, on-chip track/hold, and SOIC-8 packaging - making it the only option among the three that satisfies industrial DAQ requirements without external signal conditioning or layout compromises.
Availability
AD7893BRZ-10 is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, portable test equipment, and automated calibration systems requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for AD7893BRZ-10 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 fast, low-power, serial-output ADCs optimized for space-constrained industrial and instrumentation applications where ±10 V sensor interfacing and deterministic timing are essential.
FAQ
What is the absolute maximum analog input voltage for AD7893BRZ-10?
The absolute maximum analog input voltage for AD7893BRZ-10 is ±17 V relative to AGND, per the Absolute Maximum Ratings table. However, the specified linear operating range remains ±10 V; exceeding ±10 V risks distortion or code ambiguity even if within absolute limits. Always limit input transients with external clamping diodes when interfacing to noisy industrial environments.
Does AD7893BRZ-10 require an external clock source for conversion?
No, AD7893BRZ-10 does not require an external clock for conversion - it contains a laser-trimmed internal oscillator generating the 6 µs conversion timing. The external SCLK signal is used only for serial data readout, not for ADC core operation. This simplifies system design by eliminating clock distribution concerns between controller and ADC.
How is the 12-bit result formatted on the SDATA pin of AD7893BRZ-10?
The AD7893BRZ-10 outputs a 16-bit frame on SDATA: four leading zeros followed by the 12-bit twos-complement result, MSB-first (DB11 to DB0). After the 16th falling edge of SCLK, SDATA enters high-impedance (three-state) mode. This format ensures compatibility with 16-bit shift registers and avoids misalignment when reading into microcontroller SPI peripherals.
Can AD7893BRZ-10 operate with a reference voltage other than +2.5 V?
AD7893BRZ-10 is specified for +2.5 V ±5% (2.375 V to 2.625 V) at REF IN. While the input accepts voltages within this range, deviation directly scales full-scale range and gain error - e.g., 2.4 V reference yields ±9.6 V effective input range. Using outside this window violates datasheet specifications and may cause nonmonotonic behavior or increased INL.
What is the purpose of the CONVST pin's dual-edge functionality in AD7893BRZ-10?
The CONVST pin in AD7893BRZ-10 uses both edges: its rising edge initiates conversion and triggers track-to-hold, while its falling edge resets the internal serial output register. This dual-edge behavior enables hardware-synchronized readout - e.g., using CONVST as an interrupt to trigger MCU serial read exactly 6 µs after conversion start, ensuring deterministic timing without software delays.
AD7893BRZ-10 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- -
AD7893BRZ-10 FAQ
1.How can I place an order for AD7893BRZ-10 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7893BRZ-10 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 AD7893BRZ-10 reliable?
The price and inventory of AD7893BRZ-10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7893BRZ-10 is usually 5 days.
3.What payment methods are accepted for AD7893BRZ-10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7893BRZ-10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7893BRZ-10?
AD7893BRZ-10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7893BRZ-10 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 AD7893BRZ-10?
For technical support, including AD7893BRZ-10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7893BRZ-10 requirements.
6.How does Aetrix verify that AD7893BRZ-10 is sourced from the original manufacturer or authorized distributors?
All AD7893BRZ-10 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 AD7893BRZ-10 meets industry standards.
7.What is the process for return or replacement of AD7893BRZ-10?
All AD7893BRZ-10 units undergo pre-shipment inspection (PSI). If there is an issue with AD7893BRZ-10, 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 AD7893BRZ-10 part is unused and in its original packaging.
Return procedure for AD7893BRZ-10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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