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Analog Devices Inc. AD7827BR-REEL
- Part No.:
- AD7827BR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7827BR-REEL.pdf
- Description:
- IC ADC 8BIT SAMPLING SRL 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:14,463
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Product details
Overview
AD7827BR-REEL from Analog Devices is an 8-bit, 1 MSPS serial-output sampling ADC with on-chip track-and-hold and 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 (SCLK/RFS/DOUT) for real-time signal digitization in embedded data acquisition systems.
For engineers reviewing the AD7827BR-REEL datasheet, AD7827BR-REEL pinout, AD7827BR-REEL application, or AD7827BR-REEL 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-REEL implements a half-flash ADC architecture: a 4-bit flash stage provides MSBs, followed by a second flash stage for LSBs, achieving full 8-bit resolution in ≤420 ns. Its track-and-hold acquires input signals within 200 ns and supports up to 10 MHz analog input bandwidth.
Timing is tightly coupled to the external SCLK - RFS asserts low on the first SCLK rising edge after conversion completion, enabling synchronous 8-bit serial readout (MSB-first). Power management is controlled solely by the CONVST pin: logic level sampled ~530 ns post-conversion determines automatic power-down entry or continuous operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit straight binary output with guaranteed no missing codes - ensures monotonicity and deterministic digital representation across full input range. |
| Conversion Time | 420 ns maximum - enables ≥1 MSPS sustained throughput when synchronized to high-speed DSP serial clocks. |
| Input Range | 0 V to 2.0 V at VDD = 3 V; 0 V to 2.5 V at VDD = 5 V - auto-scaled by internal VDD detector, eliminating external range-switching circuitry. |
| Reference | On-chip 2.5 V ±2% reference - reduces BOM count and layout complexity; VREFIN/VREFOUT pin supports external 2.5 V source if higher accuracy required. |
| INL / DNL | ±0.5 LSB maximum each - guarantees linearity error <0.2% FS, critical for precision measurement and closed-loop control feedback paths. |
| Power Consumption | 10 mA max at full operation (30 mW @ 3 V); 1 µA max in power-down - enables ultra-low average power in burst-sampling applications via CONVST-controlled duty cycling. |
| SNR | 48 dB minimum @ fIN = 30 kHz, fSAMPLE = 1 MHz - sufficient for 7.5+ ENOB in baseband digitization of sensor, audio, and control signals. |
Pinout & Package
AD7827BR-REEL is housed in an 8-lead small outline IC (SOIC) package, 3.9 mm × 4.9 mm body, 1.27 mm lead pitch, RoHS-compliant. Pin 1 marked by notch or dot; pin numbering follows standard SOIC convention (counterclockwise from top-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CONVST | Convert Start / Power-Down Control | Falling edge initiates conversion and track-to-hold transition; logic level sampled ~530 ns post-conversion determines automatic power-down state - eliminates separate control lines. |
| 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 - requires local 10 nF decoupling per layout guidelines. |
| 3 - RFS | Receive Frame Sync Output | Active-low frame sync signal; goes low on first SCLK rising edge after conversion - directly interfaces with TMS320C5x, ADSP-21xx, and DSP560xx SPORT modules without glue logic. |
| 4 - GND | Analog & Digital Ground | Common reference for all analog and digital circuitry; must be connected to low-impedance system ground plane to maintain SNR and avoid digital noise coupling. |
| 5 - VREF | Reference Input/Output | Provides 2.5 V ±2% from internal bandgap; accepts external 2.5 V source - sets full-scale voltage and defines LSB size (VREF/256 @ 5 V, 0.8×VREF/256 @ 3 V). |
| 6 - DOUT | Serial Data Output | Three-state CMOS output; shifts out 8-bit result MSB-first on SCLK rising edges; enters high-Z after eighth bit - enables bus sharing in multi-device systems. |
| 7 - SCLK | Serial Clock Input | Accepts continuous external clock (no minimum frequency); timing defines data valid window and RFS synchronization - supports variable throughput via clock rate scaling. |
| 8 - VDD | Positive Supply | Single 3 V ±10% or 5 V ±10% supply powers entire signal chain - simplifies power design versus dual-supply ADCs; internal VDD detector auto-configures input range. |
Key Features
| Feature | Design Value |
|---|---|
| Half-flash conversion architecture | Enables 420 ns conversion time with minimal die area and power - balances speed, accuracy, and cost for mid-performance embedded ADC applications. |
| Integrated track-and-hold amplifier | Acquires input signals within 200 ns and supports up to 10 MHz input frequencies - eliminates need for external THA in subsampling and wideband sensor interfaces. |
| Single-pin CONVST power control | Combines conversion trigger and automatic power-down decision in one pin - reduces GPIO usage and simplifies firmware timing for battery-powered or thermally constrained systems. |
| DSP/microcontroller serial interface | Three-wire (SCLK/RFS/DOUT), MSB-first, frame-synced protocol compatible with TMS320C5x, ADSP-21xx, and DSP560xx - removes level-shifting and framing logic in real-time processing chains. |
| Supply-voltage-dependent input scaling | VDD detector automatically selects 0–2.0 V (3 V mode) or 0–2.5 V (5 V mode) full-scale range - avoids manual gain switching and maintains consistent LSB size relative to reference. |
Applications
| Industrial Process Monitoring | Motor Control Feedback |
|---|---|
|
Use Scenario: Real-time digitization of current shunt voltages, temperature sensor outputs, and pressure transducer signals in PLC I/O modules. IC Role / Device Role / Timing Role: Single-channel, high-throughput ADC capturing analog process variables at ≥100 kSPS with deterministic latency for closed-loop response. Use Value: 420 ns conversion + 200 ns acquisition enables tight sampling windows; ±0.5 LSB linearity ensures accurate calibration traceability across temperature. |
Use Scenario: Sampling motor phase currents and rotor position encoder signals in servo drives and inverters. IC Role / Device Role / Timing Role: Synchronized analog front-end digitizing multiple current sensors with precise timing alignment to PWM cycles. Use Value: On-chip 2.5 V reference eliminates external precision reference; automatic power-down during idle PWM periods cuts average power by >90%. |
| Portable Test Equipment | DSP-Based Audio Processing |
|
Use Scenario: Battery-powered handheld multimeters and oscilloscope probes requiring fast, low-power signal capture. IC Role / Device Role / Timing Role: Primary ADC interfacing directly to microcontroller SPI peripheral with minimal external components. Use Value: 1 µA power-down current extends battery life; SOIC-8 footprint fits compact PCB layouts; 3 V operation matches Li-ion battery discharge profile. |
Use Scenario: Digitizing microphone preamp outputs or line-level signals in voice recognition and acoustic analysis systems. IC Role / Device Role / Timing Role: Low-latency ADC feeding TMS320C5x or ADSP-21xx DSP for real-time FFT and filtering. Use Value: RFS output synchronizes seamlessly with DSP frame sync inputs; 48 dB SNR supports >7-bit effective resolution for speech-band signals. |
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-REEL | Same 8-bit half-flash core but 2.5 V fixed supply only; no 3 V operation; 350 ns conversion time; uses internal reference only (no VREFIN/VREFOUT pin). | Lacks dual-supply flexibility and external reference option - unsuitable where 3 V battery operation or precision external reference is required. | Select AD7823BRZ-REEL only when system operates strictly at 2.5 V and does not require VREF sourcing or scaling. |
| MAX1112EUA+ | 8-bit SAR architecture; 2.7–3.6 V supply only; 2.5 µs conversion time; SPI-compatible 4-wire interface (CS required); integrated reference. | Slower throughput and different serial protocol - requires CS signal and firmware adaptation; lower power but incompatible timing model. | Choose MAX1112EUA+ for ultra-low-power, low-throughput (<200 kSPS) applications where SPI-native interface and smaller package (µMAX) are prioritized over speed. |
Compared with AD7827BR-REEL, AD7823BRZ-REEL offers faster conversion but sacrifices supply flexibility and reference configurability, while MAX1112EUA+ trades speed for lower power and SPI compatibility - neither provides the same combination of 1 MSPS, dual-supply support, and RFS-synchronized serial interface.
Availability
AD7827BR-REEL is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, portable test equipment, and DSP-based audio processing requiring stable component supply across extended temperature ranges (–40°C to +105°C) and long production lifecycles.
Supply support for AD7827BR-REEL 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 Wilmington, MA, with design and manufacturing operations worldwide.
The AD7827BR-REEL belongs to Analog Devices' legacy high-speed sampling ADC product line, engineered specifically for real-time embedded systems demanding low-latency, low-power, and DSP-synchronous digitization of analog sensor and control signals.
FAQ
What supply voltages does the AD7827BR-REEL support, and how does it auto-detect them?
The AD7827BR-REEL operates from a single 3 V ±10% (2.7 V to 3.3 V) or 5 V ±10% (4.5 V to 5.5 V) supply. An internal VDD detector senses the supply level: it identifies 5 V operation when VDD exceeds 4.1 V and 3 V operation when VDD falls below 3.8 V. This detection automatically configures the analog input range to 0–2.5 V (5 V mode) or 0–2.0 V (3 V mode), ensuring correct full-scale scaling without external configuration. The AD7827BR-REEL's specification sheet confirms this behavior across –40°C to +105°C.
How does the AD7827BR-REEL achieve automatic power-down, and what is the timing relationship to CONVST?
The AD7827BR-REEL samples the logic level on the CONVST pin approximately 530 ns after the falling edge that initiated the conversion. If CONVST remains low at that instant, the device enters power-down mode, reducing supply current to ≤1 µA. A rising edge on CONVST then powers the device back up - with 1 µs power-up time using an external reference or 25 µs with the on-chip reference. This mechanism is intrinsic to the AD7827BR-REEL's architecture and requires no additional control signals or firmware overhead.
What is the function of the RFS pin on the AD7827BR-REEL, and which processors does it directly interface with?
The RFS (Receive Frame Sync) pin on the AD7827BR-REEL is an active-low output that asserts low on the first rising edge of SCLK after conversion completion. It serves as a hardware frame synchronization signal for DSP serial ports, enabling direct connection to TMS320C5x (in Burst Mode), ADSP-21xx (in Alternate Framing Mode), and DSP560xx processors without external logic. The AD7827BR-REEL datasheet explicitly validates this interoperability in the Microprocessor Interfacing section.
Does the AD7827BR-REEL include an internal voltage reference, and can it be overridden?
Yes, the AD7827BR-REEL integrates a 2.5 V ±2% bandgap reference, accessible at the VREF pin as VREFOUT. It also accepts an external 2.5 V reference applied to the same pin (VREFIN mode), overriding the internal source. The datasheet specifies VREFIN/REFOUT input voltage range as 2.45 V to 2.55 V, confirming strict 2.5 V nominal operation - no programmable or adjustable reference voltage is supported. This dual-mode capability is a defined feature of the AD7827BR-REEL.
What are the absolute maximum ratings for analog input voltage on the AD7827BR-REEL, and why is this critical?
The AD7827BR-REEL absolute maximum analog input voltage is –0.3 V to VDD + 0.3 V. Exceeding this range forward-biases internal ESD protection diodes (D1/D2), causing substrate current injection that may damage the part if sustained beyond 20 mA. The datasheet warns that input signals must never exceed rails by more than 200 mV - a hard limit enforced by the on-chip diode structure. Adhering to this prevents latch-up and ensures long-term reliability of the AD7827BR-REEL in noisy industrial environments.
AD7827BR-REEL 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-REEL FAQ
1.How can I place an order for AD7827BR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7827BR-REEL 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-REEL reliable?
The price and inventory of AD7827BR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7827BR-REEL is usually 5 days.
3.What payment methods are accepted for AD7827BR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7827BR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7827BR-REEL?
AD7827BR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7827BR-REEL 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-REEL?
For technical support, including AD7827BR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7827BR-REEL requirements.
6.How does Aetrix verify that AD7827BR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7827BR-REEL 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-REEL meets industry standards.
7.What is the process for return or replacement of AD7827BR-REEL?
All AD7827BR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7827BR-REEL, 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-REEL part is unused and in its original packaging.
Return procedure for AD7827BR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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