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Analog Devices Inc. AD7827BR-REEL7
- Part No.:
- AD7827BR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7827BR-REEL7.pdf
- Description:
- IC ADC 8BIT SAMPLING SRL 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
AD7827BR-REEL7 from Analog Devices is an 8-bit, 1 MSPS serial-output sampling ADC with on-chip track-and-hold and internal 2.5 V reference (±2% tolerance), operating from single 3 V ±10% or 5 V ±10% supply. It delivers 420 ns conversion time, 200 ns acquisition time, and supports DSP/microcontroller-compatible three-wire serial interface (RFS/DOUT/SCLK) for real-time signal digitization in embedded data acquisition systems.
For engineers reviewing the AD7827BR-REEL7 datasheet, AD7827BR-REEL7 pinout, AD7827BR-REEL7 application, or AD7827BR-REEL7 equivalent, key selection considerations include its dual-supply compatibility (3 V/5 V), automatic power-down via CONVST pin, guaranteed 8-bit no-missing-codes performance, ±0.5 LSB INL/DNL, and SOIC-8 packaging optimized for space-constrained industrial and instrumentation designs.
Technical Context
The AD7827BR-REEL7 employs a half-flash architecture: a 4-bit flash ADC generates MSBs, followed by a second flash stage for LSBs-achieving full 8-bit resolution in ≤420 ns. Its track-and-hold acquires input within 200 ns and holds for 120 ns during conversion, enabling accurate sampling of up to 10 MHz analog signals at 1 MSPS.
Timing is tightly coupled to the external SCLK: RFS falls after conversion completion to synchronize serial readout, with DOUT valid on rising SCLK edges. The CONVST pin serves dual function-initiating conversion on its falling edge and triggering automatic power-down when sampled low ~530 ns post-conversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit with guaranteed no missing codes-ensures monotonic transfer function for precision measurement applications. |
| Conversion Time | 420 ns max-enables ≥1 MSPS throughput when paired with compatible SCLK timing and minimal inter-conversion delay. |
| Input Range | 0 V to 2.0 V @ 3 V supply; 0 V to 2.5 V @ 5 V supply-automatically scaled by internal VDD detector without external scaling circuitry. |
| Reference | On-chip 2.5 V ±2% reference-eliminates need for external reference in cost-sensitive designs while maintaining DC accuracy. |
| INL / DNL | ±0.5 LSB max each-supports high-fidelity digitization of sensor outputs and control loop feedback signals. |
| Power Consumption | 10 mA max @ normal operation (30 mW @ 3 V); 1 µA max in power-down-enables ultra-low average power in burst-sampling systems. |
| SNR | 48 dB min @ fIN = 30 kHz-validates usable dynamic range for audio-band and medium-speed control signal capture. |
Pinout & Package
AD7827BR-REEL7 is housed in an 8-lead small outline IC (SOIC) package, 3.9 mm × 4.9 mm body size, with standard 1.27 mm lead pitch and gull-wing leads. Pin 1 marked by notch or dot; pin numbering counterclockwise from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CONVST | Convert Start / Power-Down Control | Falling edge initiates track-to-hold transition and conversion; state sampled ~530 ns post-conversion determines automatic power-down entry. |
| 2 - VIN | Analog Input | Single-ended input with rail-dependent range (0–2.0 V @ 3 V, 0–2.5 V @ 5 V); includes ESD protection diodes and 310 Ω series resistance. |
| 3 - RFS | Receive Frame Sync Output | Active-low logic output signaling end of conversion; synchronizes serial data latching on master device's next SCLK rising edge. |
| 4 - GND | Analog & Digital Ground | Common reference for all analog and digital circuitry; requires low-impedance connection to minimize noise coupling. |
| 5 - VREF | Reference Input/Output | Provides 2.5 V ±2% internal reference; accepts external 2.5 V source but does not support adjustable reference voltage. |
| 6 - DOUT | Serial Data Output | Tri-state CMOS output shifting 8-bit straight-binary code MSB-first on rising SCLK edges; enters high-Z after 8th bit. |
| 7 - SCLK | Serial Clock Input | Continuous external clock driving serial interface timing; minimum pulse width 25 ns @ both 3 V and 5 V supplies. |
| 8 - VDD | Positive Supply | Single 3 V ±10% or 5 V ±10% supply powering analog core, reference, and digital interface; includes internal VDD detector. |
Key Features
| Feature | Design Value |
|---|---|
| Half-flash conversion architecture | Delivers 8-bit resolution in 420 ns using two-stage flash sub-conversion-reducing die area vs. full-flash while maintaining speed. |
| Integrated track-and-hold amplifier | Acquires input within 200 ns and holds for precise 120 ns window-enables accurate sampling of fast transients without external THA. |
| Dual-supply voltage detection | Automatically configures input range (0–2.0 V or 0–2.5 V) and LSB scaling based on VDD level-no configuration register or external logic required. |
| Three-wire serial interface | Direct compatibility with TMS320C5x, ADSP-21xx, and DSP560xx serial ports-eliminates glue logic and simplifies PCB routing. |
| Automatic power-down control | Reduces IDD from 10 mA to 1 µA between conversions using only CONVST pin state-cuts average power >99% at low throughput rates. |
Applications
| Industrial Process Monitoring | Motor Control Feedback |
|---|---|
|
Use Scenario: Real-time monitoring of temperature, pressure, and current sensors in PLC I/O modules operating across –40°C to +105°C ambient. IC Role / Device Role / Timing Role: Primary sampling ADC capturing analog sensor outputs at up to 1 MSPS with deterministic 420 ns latency and automatic power cycling between samples. Use Value: Guaranteed 8-bit linearity (±0.5 LSB INL) ensures accurate calibration traceability; on-chip 2.5 V reference eliminates external component drift errors. |
Use Scenario: Digitizing back-EMF, phase current, or rotor position signals in servo drives and inverters with tight thermal constraints. IC Role / Device Role / Timing Role: High-speed analog front-end ADC interfacing directly to DSP serial port (e.g., TMS320C5x) for closed-loop control loop execution. Use Value: 200 ns acquisition time supports accurate sampling of fast-switching motor waveforms; SOIC-8 footprint enables compact gate-driver board integration. |
| Portable Test Equipment | DSP-Based Audio Signal Capture |
|
Use Scenario: Battery-powered handheld oscilloscopes and multimeters requiring low quiescent current and rapid wake-on-event sampling. IC Role / Device Role / Timing Role: Low-power ADC entering 1 µA power-down mode between triggered acquisitions, awakened by microcontroller's CONVST pulse. Use Value: Automatic power-down reduces average supply current to <10 µA at 1 kSPS-extending battery life without sacrificing 1 MSPS peak capability. |
Use Scenario: Digitizing microphone or line-level audio signals in voice-recognition edge devices using ADSP-21xx family processors. IC Role / Device Role / Timing Role: Serial ADC synchronized to DSP SPORT in alternate framing mode, delivering 8-bit samples with minimal interface overhead. Use Value: 48 dB SNR at 30 kHz enables clear speech capture; built-in track-and-hold rejects aliasing from anti-alias filter roll-off imperfections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, serial-interface sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7823BRZ-REEL7 | Same SOIC-8 package and pinout; 1 MSPS, 8-bit, but uses external reference only (no internal 2.5 V ref); higher INL (±1 LSB). | Requires external precision reference (e.g., ADR3425) and additional decoupling; better suited where reference flexibility or tighter long-term stability is needed. | Select AD7823BRZ-REEL7 if reference voltage must be user-defined or traceable to metrology-grade source; avoid if board space or BOM count reduction is critical. |
| MAX1113ECUA+ | 8-pin µMAX package (not SOIC); 1.25 MSPS, 8-bit, internal reference (2.048 V); SPI-compatible 4-wire interface (CS required). | Requires chip-select signal and different timing protocol; smaller footprint but incompatible pinout and layout-PCB redesign needed. | Choose MAX1113ECUA+ only for new designs prioritizing ultra-compact size over drop-in replacement; not suitable for AD7827BR-REEL7 footprint reuse. |
Compared with AD7827BR-REEL7, AD7823BRZ-REEL7 trades integrated reference convenience for reference flexibility, while MAX1113ECUA+ offers higher speed and smaller package at the cost of interface compatibility and pinout reuse-making AD7827BR-REEL7 optimal for cost-sensitive, space-constrained industrial designs needing zero-configuration analog input scaling.
Availability
AD7827BR-REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, portable test equipment, and DSP-based audio signal capture requiring stable component supply, extended temperature operation (–40°C to +105°C), and long-term obsolescence management.
Supply support for AD7827BR-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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7827BR-REEL7 belongs to Analog Devices' legacy high-speed sampling ADC product line, designed specifically for embedded systems requiring low-power, single-supply, serial-interface digitization with minimal external components and guaranteed DC accuracy.
FAQ
What is the maximum sampling rate supported by the AD7827BR-REEL7?
The AD7827BR-REEL7 achieves a maximum throughput rate of 1 MSPS under specified conditions: VDD = 3 V ±10% or 5 V ±10%, fIN = 30 kHz, and proper SCLK timing adherence (minimum 25 ns high/low pulse width). This rate assumes minimal inter-conversion delay and use of Mode 1 (high-speed sampling) operation. Actual system throughput may be limited by host processor serial interface timing and CONVST assertion/recovery intervals.
Does the AD7827BR-REEL7 require an external reference voltage?
No, the AD7827BR-REEL7 includes an on-chip 2.5 V reference with ±2% tolerance, eliminating the need for an external reference in most applications. The VREF pin can serve as output (2.5 V) or accept an external 2.5 V source-but it does not support adjustable reference voltages. Using the internal reference simplifies design and reduces BOM count, while external reference use is reserved for applications demanding tighter initial accuracy or long-term stability.
How does the automatic power-down feature work on the AD7827BR-REEL7?
The AD7827BR-REEL7 implements automatic power-down by sampling the logic state of the CONVST pin approximately 530 ns after its falling edge (end of conversion). If CONVST remains low at that instant, the device enters power-down mode, reducing supply current from 10 mA to 1 µA. Power-up occurs on the next rising edge of CONVST. This feature enables dramatic average power reduction in burst-sampling applications without requiring separate control signals or firmware overhead.
Is the AD7827BR-REEL7 pin-compatible with other members of the AD782x family?
Yes, the AD7827BR-REEL7 shares identical SOIC-8 pinout and electrical interface with AD7823BRZ-REEL7 and AD7825BRZ-REEL7, including CONVST, VIN, RFS, GND, VREF, DOUT, SCLK, and VDD assignments. However, functional differences exist: AD7823 lacks internal reference; AD7825 is 10-bit. System-level compatibility requires verification of reference configuration, resolution requirements, and timing margins-especially for power-down behavior and acquisition time.
What are the absolute maximum ratings for the AD7827BR-REEL7 analog input voltage?
The absolute maximum analog input voltage for the AD7827BR-REEL7 is –0.3 V to VDD + 0.3 V, per the Absolute Maximum Ratings table. Exceeding this range risks forward-biasing internal ESD protection diodes, potentially causing substrate current injection or irreversible damage. For reliable operation, the input must stay within the specified ranges: 0 V to 2.0 V when VDD = 3 V, or 0 V to 2.5 V when VDD = 5 V. A 10 nF decoupling capacitor on VIN is recommended to suppress noise and transient overshoot.
AD7827BR-REEL7 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:
- 8
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7827BR-REEL7 FAQ
1.How can I place an order for AD7827BR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7827BR-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 AD7827BR-REEL7 reliable?
The price and inventory of AD7827BR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7827BR-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7827BR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7827BR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7827BR-REEL7?
AD7827BR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7827BR-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 AD7827BR-REEL7?
For technical support, including AD7827BR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7827BR-REEL7 requirements.
6.How does Aetrix verify that AD7827BR-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7827BR-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 AD7827BR-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7827BR-REEL7?
All AD7827BR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7827BR-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 AD7827BR-REEL7 part is unused and in its original packaging.
Return procedure for AD7827BR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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