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Analog Devices Inc. AD7825BRZ-REEL
- Part No.:
- AD7825BRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7825BRZ-REEL.pdf
- Description:
- IC ADC 8BIT PIPELINED 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,504
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Product details
Overview
AD7825BRZ-REEL from Analog Devices is a high-speed, 4-channel, 8-bit parallel-output analog-to-digital converter with 2 MSPS throughput, 420 ns conversion time, on-chip 2.5 V reference, and track-and-hold-designed for DSP front ends and mobile communication subsampling applications.
For engineers reviewing the AD7825BRZ-REEL datasheet, AD7825BRZ-REEL pinout, AD7825BRZ-REEL application, or AD7825BRZ-REEL equivalent, key selection considerations include channel count (4 single-ended), supply flexibility (3 V ±10% or 5 V ±10%), automatic power-down via CONVST, EOC-driven interrupt timing, and VMID-adjustable input span centering.
Technical Context
The AD7825BRZ-REEL implements an 8-bit half-flash ADC architecture with two-stage conversion: a 4-bit coarse flash stage followed by a 4-bit fine flash stage, completing within 420 ns max. It integrates a track-and-hold amplifier with 200 ns acquisition time and full-power bandwidth up to 10 MHz.
Its parallel interface uses active-low CS and RD signals with EOC pulse output for microprocessor/DSP synchronization; channel selection is performed via dedicated A0/A1 address inputs, independent of data bus writes. Power management combines automatic post-conversion shutdown (sampled at EOC high) and a dedicated PD pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - guarantees no missing codes over full temperature range (−40°C to +85°C) |
| Max Throughput | 2 MSPS - enables real-time sampling in high-speed data acquisition systems |
| Conversion Time | 420 ns max - defines minimum inter-conversion interval for sustained high-rate operation |
| Analog Input Channels | 4 single-ended - supports multiplexed signal capture without external MUX control logic |
| Supply Voltage Range | 3 V ±10% or 5 V ±10% - allows direct interfacing with both low-voltage and legacy 5 V logic systems |
| On-Chip Reference | 2.5 V ±50 mV - eliminates need for external precision reference in cost-sensitive designs |
| INL / DNL | ±0.75 LSB max - ensures monotonicity and predictable linearity across all 4 channels |
| Channel Isolation | −70 dB typ - minimizes crosstalk during simultaneous multi-channel sampling |
Pinout & Package
AD7825BRZ-REEL is housed in a 24-lead, 0.3" wide SOIC package (RoHS-compliant, tape-and-reel). Pin layout supports compact PCB placement and standard surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN4 | Analog Input Channels | Four single-ended inputs; voltage span auto-configured to 2.0 V (3 V supply) or 2.5 V (5 V supply) |
| CONVST | Convert Start / Power-Down Control | Falling edge initiates conversion; logic level sampled at EOC high determines automatic shutdown |
| EOC | End-of-Conversion Output | Active-low pulse signals completion; used to trigger MCU interrupts or latch data in external logic |
| RD & CS | Parallel Interface Enable | Both must be low to drive DB0–DB7; enables shared-bus operation with other peripherals |
| A0, A1 | Channel Address Inputs | Selects VIN1–VIN4 prior to RD assertion; no register write required for channel switching |
| PD | Dedicated Power-Down Input | Logic low forces immediate low-power state; faster entry than automatic CONVST-based shutdown |
| VREF IN/OUT | Reference I/O | Provides access to internal 2.5 V reference or accepts external reference for improved accuracy |
| VMID | Input Span Centering | Adjusts common-mode point of analog inputs; default = 1.0 V (3 V) or 1.25 V (5 V) when unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Half-flash conversion architecture | Enables 420 ns conversion time while maintaining 8-bit resolution and monotonicity |
| Auto-ranging input span | Detects VDD level (3 V vs. 5 V) to configure 2.0 V or 2.5 V full-scale range without software intervention |
| VMID offset adjust | Allows analog input common-mode to be centered anywhere between AGND and VDD-reducing op amp headroom requirements |
| Track-and-hold FPBW = 10 MHz | Supports accurate digitization of high-frequency signals (e.g., IF subsampling in wireless receivers) |
| Flexible power-down modes | Combines automatic (via CONVST sampling) and manual (via PD pin) control for optimal dynamic power management |
| Standalone operation capability | EOC pulse and simple address decoding allow use without microcontroller-ideal for gate array or FPGA-based systems |
Applications
| Data Acquisition Systems | DSP Front Ends |
|---|---|
Use Scenario: High-speed logging of sensor outputs in industrial PLCs with tight timing budgets. IC Role / Device Role / Timing Role: ADC core capturing four analog channels at up to 2 MSPS, synchronized via EOC-triggered DMA transfers. Use Value: 420 ns conversion time maximizes available processing time per sample for real-time filtering or analysis. | Use Scenario: Digitizing baseband or IF signals in digital radio transceivers before FFT processing. IC Role / Device Role / Timing Role: Subsampling ADC providing 8-bit samples to ADSP-21xx processors using parallel interface and EOC handshake. Use Value: 10 MHz full-power bandwidth and −70 dB channel isolation preserve signal integrity during multi-tone capture. |
| Disk Drive Read Channels | Mobile Communication Systems |
Use Scenario: Reading servo position error signals and read/write channel feedback in HDD controller ASICs. IC Role / Device Role / Timing Role: Low-latency, multi-channel ADC converting analog head positioning data with minimal jitter. Use Value: Automatic power-down after each conversion reduces average current draw in burst-mode operation. | Use Scenario: Signal conditioning in GSM/EDGE handset RF front ends requiring compact, low-power digitization. IC Role / Device Role / Timing Role: 4-channel ADC digitizing RSSI, temperature, battery voltage, and PA bias in space-constrained modules. Use Value: Dual-supply compatibility (3 V/5 V) and VMID adjust simplify integration with mixed-voltage analog subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel, 8-bit, parallel-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7822BRZ | Single-channel version; same 2 MSPS rate, 420 ns conversion, and SOIC-20 package | Lacks multiplexed inputs-requires external MUX for multi-signal capture | Select when only one analog source needs digitization and board space is constrained |
| ADS7822U | 8-bit, 200 kSPS, SPI interface, 3 V only, MSOP-8 package; no on-chip reference or T/H | Lower speed, serial interface, no integrated track-and-hold-requires external sampling circuitry | Select for ultra-low-power, space-limited applications where throughput < 200 kSPS suffices |
Compared with AD7825BRZ-REEL, AD7822BRZ offers identical performance per channel but lacks multi-input capability, while ADS7822U trades speed, parallel interface, and integrated analog functions for smaller size and lower quiescent current-making each suitable for distinct system-level trade-offs.
Availability
AD7825BRZ-REEL is available at Aetrix Electronics and suitable for data acquisition systems, DSP front ends, and disk drive electronics requiring stable component supply, long-term production continuity, and RoHS-compliant packaging.
Supply support for AD7825BRZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD782x family-including AD7825BRZ-REEL-is engineered for high-speed, multi-channel digitization in real-time signal processing systems where low latency, flexible supply operation, and integrated analog functions are critical.
FAQ
What is the maximum sampling rate supported by the AD7825BRZ-REEL?
The AD7825BRZ-REEL supports a maximum throughput of 2 MSPS, corresponding to a guaranteed maximum conversion time of 420 ns. This rate is achievable across the full industrial temperature range (−40°C to +85°C) and under both 3 V ±10% and 5 V ±10% supply conditions, as verified in the Rev. C datasheet timing characteristics table.
Does the AD7825BRZ-REEL require an external reference voltage?
No, the AD7825BRZ-REEL includes an on-chip 2.5 V reference with ±50 mV accuracy and 50 ppm/°C temperature coefficient, accessible at the VREF IN/OUT pin. External reference use is optional and only recommended when higher initial accuracy or lower drift is required-AD7825BRZ-REEL operates fully functional with the internal reference enabled.
How many analog input channels does the AD7825BRZ-REEL have, and how are they selected?
The AD7825BRZ-REEL has four single-ended analog input channels (VIN1 to VIN4). Channel selection is performed using the A0 and A1 address pins-no register write or data bus interaction is needed. The selected channel is sampled on the falling edge of CONVST, and the EOC pulse confirms completion of the AD7825BRZ-REEL conversion.
What power-saving features does the AD7825BRZ-REEL provide?
The AD7825BRZ-REEL provides two complementary power-down mechanisms: (1) automatic shutdown triggered by sampling the CONVST pin state at EOC high, and (2) explicit control via the dedicated PD pin. In power-down mode, supply current drops to ≤5 μA, enabling energy-efficient burst-mode operation in portable or thermally constrained systems using AD7825BRZ-REEL.
Is the AD7825BRZ-REEL compatible with both 3 V and 5 V digital interfaces?
Yes, the AD7825BRZ-REEL supports dual supply operation: logic inputs accept 3 V ±10% or 5 V ±10% VDD, with corresponding VIH/VIL thresholds (e.g., VIH = 2.0 V min at 3 V, 2.4 V min at 5 V). Its parallel outputs (DB0–DB7) drive compatible logic levels in either regime, and the AD7825BRZ-REEL automatically configures analog input span (2.0 V or 2.5 V) based on detected VDD level.
AD7825BRZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 2M
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Pipelined
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.3V, 5V
- Voltage - Supply, Digital:
- 2.7V ~ 3.3V, 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7825BRZ-REEL FAQ
1.How can I place an order for AD7825BRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7825BRZ-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 AD7825BRZ-REEL reliable?
The price and inventory of AD7825BRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7825BRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7825BRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7825BRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7825BRZ-REEL?
AD7825BRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7825BRZ-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 AD7825BRZ-REEL?
For technical support, including AD7825BRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7825BRZ-REEL requirements.
6.How does Aetrix verify that AD7825BRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7825BRZ-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 AD7825BRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7825BRZ-REEL?
All AD7825BRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7825BRZ-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 AD7825BRZ-REEL part is unused and in its original packaging.
Return procedure for AD7825BRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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