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Analog Devices Inc. AD7825BRZ
- Part No.:
- AD7825BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7825BRZ.pdf
- Description:
- IC ADC 8BIT PIPELINED 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:192
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Product details
Overview
AD7825BRZ from Analog Devices is a high-speed, 4-channel, 8-bit parallel-output analog-to-digital converter (ADC) with 2 MSPS throughput, 420 ns conversion time, on-chip 2.5 V reference, and track-and-hold - designed for DSP front ends and subsampling applications in mobile communications and disk drives.
For engineers reviewing the AD7825BRZ datasheet, AD7825BRZ pinout, AD7825BRZ application, or AD7825BRZ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply support for industrial embedded and data acquisition systems.
Technical Context
The AD7825BRZ implements an 8-bit half-flash ADC architecture with two-stage flash conversion: a coarse 4-bit flash stage followed by a fine 4-bit flash stage, completing within 420 ns max. It integrates a track-and-hold amplifier with 200 ns acquisition time and supports automatic power-down triggered by CONVST logic level sampling at EOC assertion.
Channel selection is performed via dedicated A0/A1 address inputs (not written to), enabling immediate multiplexer switching without register access. The parallel interface uses active-low CS and RD with EOC pulse output, allowing standalone operation or microprocessor/DSP interfacing without external timing logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit straight binary output - guarantees no missing codes over full temperature range (−40°C to +85°C). |
| Conversion Rate | 2 MSPS maximum - enables real-time signal capture in high-speed DSP front ends and subsampling systems. |
| Conversion Time | 420 ns max - defines minimum inter-conversion interval and sets upper bound on system latency. |
| Input Channels | 4 single-ended analog inputs (VIN1–VIN4) - supports multi-sensor or multi-phase acquisition without external MUX. |
| Supply Voltage | 3 V ± 10% or 5 V ± 10% - dual-voltage compatibility simplifies integration into mixed-supply industrial and portable systems. |
| On-Chip Reference | 2.5 V ± 50 mV - eliminates need for external reference in cost-sensitive designs; VMID allows input span centering. |
| Power Dissipation | 24 mW typical at 3 V, 36 mW max - enables low-power operation in battery-backed or thermally constrained modules. |
Pinout & Package
The AD7825BRZ is housed in a 24-lead, 0.3" wide plastic dual in-line package (PDIP) with standard through-hole mounting. Pin layout follows industry-standard SOIC-compatible footprint for drop-in replacement in legacy layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN4 | Analog Input Channels | Four independent single-ended inputs; default 0 V–2.5 V span at 5 V supply, centered by VMID voltage. |
| CONVST | Convert Start / Power-Down Control | Falling edge initiates conversion and places T/H in hold mode; logic level sampled at EOC high to auto-enter power-down. |
| EOC | End-of-Conversion Output | Active-low pulse signals completion; used to trigger microcontroller ISR or latch data without polling. |
| RD & CS | Parallel Interface Enable | Both must be low to drive DB0–DB7; enables direct connection to 8051, PIC, or ADSP-21xx data buses. |
| A0, A1 | Channel Address Inputs | Select VIN1–VIN4 directly via hardware address lines - no software register writes required. |
| PD | Power-Down Input | Separate logic input (not shared with CONVST) forces deep sleep; recovery time <1 μs with external 2.5 V reference. |
| VREF IN/OUT | Reference I/O | Provides access to internal 2.5 V reference or accepts external reference; decoupling to AGND improves noise immunity. |
| VMID | Input Span Center | Sets common-mode midpoint for all analog inputs; default = 1.25 V at 5 V supply, adjustable from AGND to VDD. |
Key Features
| Feature | Design Value |
|---|---|
| Half-flash conversion architecture | Enables 420 ns conversion time while minimizing die area and power vs. full-flash alternatives. |
| Hardware channel selection (A0/A1) | Eliminates firmware overhead and bus contention during rapid multi-channel sampling sequences. |
| Automatic power-down on CONVST low | Reduces average current to 0.2 μA typ between conversions - critical for burst-mode portable systems. |
| VMID-adjustable input span | Allows single-supply op amp interfacing without level-shifting; accommodates system offset drift up to ±1.25 V. |
| Track-and-hold FPBW ≥10 MHz | Supports accurate digitization of IF signals in subsampling architectures without external anti-alias filtering. |
Applications
| Disk Drive Read Channel | Mobile Baseband Subsampling |
|---|---|
Use Scenario: Digitizing analog servo position error signals and readback waveforms in HDD head positioning circuits. IC Role / Device Role / Timing Role: ADC front end capturing 2 MSPS bursts synchronized to spindle rotation and sector timing. Use Value: 420 ns conversion time ensures minimal latency in closed-loop servo correction; 4-channel capability supports simultaneous tracking of multiple servo wedges. |
Use Scenario: Sampling intermediate frequency (IF) signals in GSM/EDGE transceivers for digital downconversion. IC Role / Device Role / Timing Role: High-speed subsampling ADC operating at 2 MSPS with >10 MHz full-power bandwidth. Use Value: On-chip 2.5 V reference and VMID adjust enable direct interface to single-supply IF amplifiers; low power-down current extends battery life in burst receive modes. |
| DSP-Based Data Acquisition | Industrial Motor Phase Monitoring |
Use Scenario: Capturing multi-channel sensor outputs (voltage, current, temperature) for real-time FFT analysis in motor control DSPs. IC Role / Device Role / Timing Role: Parallel-interface ADC feeding ADSP-21xx or similar fixed-point DSP via dedicated 8-bit data bus. Use Value: EOC pulse triggers DMA-ready interrupt; hardware A0/A1 addressing allows deterministic channel sequencing without CPU intervention. |
Use Scenario: Monitoring three-phase AC motor currents using isolated amplifiers, with fourth channel reserved for DC bus voltage. IC Role / Device Role / Timing Role: 4-channel simultaneous sampling ADC providing synchronized current/voltage snapshots for vector control algorithms. Use Value: −70 dB channel-to-channel isolation prevents crosstalk-induced torque ripple; 3 V/5 V supply flexibility matches isolated power rail voltages. |
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 | 1-channel version, same 420 ns conversion time, identical pinout except missing A0/A1 and VIN2–VIN4 pins. | Limited to single-signal acquisition; unsuitable for multi-sensor or phase-comparison use cases. | Select only when channel count reduction justifies PCB redesign and layout simplification. |
| MAX1186ECM+ | 4-channel, 8-bit, 2 MSPS SAR ADC with SPI interface; no on-chip reference; requires external 2.5 V ref and driver. | Serial interface increases firmware overhead and reduces real-time determinism vs. parallel EOC-driven operation. | Prefer when board space constraints prohibit 24-pin DIP/SOIC or when SPI bus sharing is advantageous. |
Compared with AD7825BRZ, AD7822BRZ reduces channel count but retains identical speed and power behavior, while MAX1186ECM+ trades parallel simplicity for serial interface flexibility and higher external component count.
Availability
AD7825BRZ is available at Aetrix Electronics and suitable for data acquisition systems, disk drive electronics, and mobile communication subsystems requiring stable component supply across extended product lifecycles.
Supply support for AD7825BRZ 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, with R&D and manufacturing operations worldwide.
The AD7822/AD7825/AD7829 family was engineered for high-speed, low-latency data acquisition in resource-constrained embedded systems - emphasizing minimal external components, flexible supply operation, and deterministic parallel interfacing.
FAQ
What is the maximum sampling rate supported by the AD7825BRZ?
The AD7825BRZ 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 require an external reference voltage?
No, the AD7825BRZ includes an on-chip 2.5 V reference with ±50 mV accuracy and 50 ppm/°C temperature coefficient. The VREF IN/OUT pin can be left unconnected for internal reference use or driven externally for improved precision - the AD7825BRZ automatically detects and selects the active reference source.
How does channel selection work on the AD7825BRZ?
Channel selection on the AD7825BRZ is performed via hardware address inputs A0 and A1, which directly control the internal analog multiplexer. No register writes or serial commands are needed - VIN1–VIN4 are selected by static logic levels on these pins before each conversion, enabling zero-software-overhead multi-channel sequencing.
Can the AD7825BRZ operate from a 3.3 V supply?
Yes, the AD7825BRZ is explicitly specified for 3 V ± 10% operation (2.7 V to 3.3 V), with verified performance including 420 ns conversion time, 48 dB SNR, and 8-bit no-missing-codes guarantee. Input span adjusts automatically to 0 V–2 V p-p, and logic thresholds adapt to 3 V levels per Table 1 specifications.
What is the purpose of the VMID pin on the AD7825BRZ?
The VMID pin on the AD7825BRZ sets the common-mode center point for all analog inputs (VIN1–VIN4). When left unconnected, it defaults to 1.25 V (at 5 V supply) or 1.0 V (at 3 V supply), establishing a 0 V–2.5 V or 0 V–2 V input range. Connecting an external voltage allows precise centering anywhere between AGND and VDD to accommodate system offsets or single-supply op amp outputs.
AD7825BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for AD7825BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7825BRZ 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 reliable?
The price and inventory of AD7825BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7825BRZ is usually 5 days.
3.What payment methods are accepted for AD7825BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7825BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7825BRZ?
AD7825BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7825BRZ 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?
For technical support, including AD7825BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7825BRZ requirements.
6.How does Aetrix verify that AD7825BRZ is sourced from the original manufacturer or authorized distributors?
All AD7825BRZ 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 meets industry standards.
7.What is the process for return or replacement of AD7825BRZ?
All AD7825BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7825BRZ, 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 part is unused and in its original packaging.
Return procedure for AD7825BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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