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Analog Devices Inc. AD7825BRUZ
- Part No.:
- AD7825BRUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7825BRUZ.pdf
- Description:
- IC ADC 8BIT PIPELINED 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,504
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Product details
Overview
AD7825BRUZ from Analog Devices is a 4-channel, 8-bit, 2 MSPS parallel-output analog-to-digital converter with on-chip 2.5 V reference, track-and-hold, and automatic power-down. It operates from single 3 V ±10% or 5 V ±10% supply, delivers 420 ns conversion time, and supports standalone operation via EOC pulse - used in DSP front ends, disk drive servo control, and mobile communication subsampling systems.
For engineers reviewing the AD7825BRUZ datasheet, AD7825BRUZ pinout, AD7825BRUZ application, or AD7825BRUZ equivalent, key selection criteria include channel count (4), conversion speed (2 MSPS), supply flexibility (3 V/5 V), input span adjustability via VMID, and compatibility with microprocessor/DSP parallel interfaces without external timing logic.
Technical Context
The AD7825BRUZ 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 in ≤200 ns and supports full-scale signals up to 10 MHz, enabling subsampling applications.
Channel selection is performed externally via A0/A1 address inputs; no internal register write is required. The CONVST pin serves dual function - initiating conversion on its falling edge and triggering automatic power-down when sampled low at EOC assertion - while PD provides dedicated power-down control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - guarantees monotonic transfer function and no missing codes over full temperature range. |
| Max Throughput | 2 MSPS - enables real-time sampling of baseband and IF signals in communications and storage systems. |
| Conversion Time | 420 ns max - defines minimum inter-conversion interval; allows maximum DSP processing time per sample. |
| Analog Input Channels | 4 single-ended - selectable via A0/A1; eliminates need for external multiplexer in multi-sensor data acquisition. |
| Supply Range | 3 V ±10% or 5 V ±10% - supports mixed-voltage system integration without level-shifting circuitry. |
| On-Chip Reference | 2.5 V ±50 mV - reduces BOM count and layout area; eliminates external reference unless higher accuracy required. |
| Power-Down Current | 5 μA max - enables ultra-low-power idle states between conversions in battery-sensitive applications. |
Pinout & Package
AD7825BRUZ is housed in a 24-lead TSSOP (RU-24) package, 3.9 mm × 8.7 mm, 0.65 mm pitch, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN4 | Analog Input Channels | Four single-ended inputs; default span = 0 V to 2.5 V (5 V supply) or 0 V to 2 V (3 V supply); centered via VMID. |
| CONVST | Convert Start / Power-Down Trigger | Falling edge initiates conversion and places T/H in hold mode; sampled at EOC to auto-enter power-down if low. |
| EOC | End-of-Conversion Output | Active-low pulse (≥70 ns wide) signals data validity; used to trigger microcontroller ISR or latch data in gate array. |
| RD & CS | Parallel Interface Enable | Both must be low to enable DB0–DB7 output drivers; supports shared bus operation with standard address decoding. |
| A0, A1 | Channel Address Inputs | Select VIN1–VIN4 directly - no internal register access needed; simplifies FPGA/microcontroller interface logic. |
| PD | Dedicated Power-Down Control | Logic low forces immediate power-down; independent of CONVST state - critical for deterministic low-power sequencing. |
| VREF IN/OUT | Reference I/O | Supplies or sinks 2.5 V reference; can be bypassed with 0.1 µF capacitor when using internal reference. |
| VMID | Input Span Centering | Adjusts common-mode point of analog inputs; enables single-supply op amp interfacing and system offset compensation. |
Key Features
| Feature | Design Value |
|---|---|
| 420 ns conversion time | Enables 2 MSPS throughput with minimal dead time - maximizes real-time processing bandwidth in DSP-based systems. |
| On-chip 2.5 V reference (±2%) | Eliminates external reference IC and associated decoupling, reducing component count and PCB area in space-constrained designs. |
| Automatic power-down via CONVST | Reduces average power consumption without software overhead - ideal for burst-mode acquisition in portable equipment. |
| VMID-adjustable input span | Allows input range centering anywhere between AGND and VDD - accommodates sensor offsets and single-supply signal conditioning. |
| Channel selection via A0/A1 | Hardware-based multiplexing removes firmware dependency and timing uncertainty - improves determinism in hard real-time loops. |
Applications
| Disk Drive Servo Control | DSP Front-End Acquisition |
|---|---|
Use Scenario: Real-time position error signal (PES) sampling from read/write head preamplifiers during track-following. IC Role / Device Role / Timing Role: 4-channel ADC digitizing differential PES, velocity, current, and temperature feedback at 1–2 MSPS for closed-loop servo correction. Use Value: 420 ns conversion + automatic power-down minimizes thermal drift and power dissipation in tightly packed actuator assemblies. |
Use Scenario: Digitizing analog sensor outputs (vibration, temperature, current) before FFT or filtering in embedded DSP subsystems. IC Role / Device Role / Timing Role: Parallel-output ADC feeding ADSP-21xx or similar processors via simple address decode - no glue logic required. Use Value: EOC pulse enables interrupt-driven sampling; 2 MSPS rate supports Nyquist sampling of 1 MHz bandwidth signals without undersampling artifacts. |
| Mobile Communication Subsampling | Industrial Data Acquisition |
Use Scenario: Direct IF sampling of 10–20 MHz bandpass signals in GSM/EDGE transceivers to reduce analog filter complexity. IC Role / Device Role / Timing Role: High-FPBW track-and-hold (10 MHz full-power bandwidth) capturing instantaneous IF amplitude for digital demodulation. Use Value: SNR ≥48 dB at 30 kHz and −70 dB channel isolation ensure clean digitization of adjacent channels in dense RF environments. |
Use Scenario: Multi-sensor monitoring in PLC I/O modules where four analog inputs (4–20 mA, thermocouple, voltage) require synchronized sampling. IC Role / Device Role / Timing Role: 4-channel ADC with VMID adjustment compensating for sensor offset and supply rail variations across industrial temperature range. Use Value: 3 V/5 V dual-supply support allows direct integration into legacy 5 V control systems or modern 3.3 V embedded controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel, 8-bit, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7822BRUZ | 1-channel version; identical conversion speed, reference, and interface; lacks A0/A1 and VIN2–VIN4 pins. | Suitable only for single-input systems; requires external MUX for multi-channel use - increases latency and board area. | Select AD7822BRUZ only when channel count is strictly one and footprint minimization is prioritized over flexibility. |
| ADS7822U | 8-bit, 200 kSPS, SPI interface; no on-chip reference; requires external 2.5 V reference and serial clock generation. | Limited to lower throughput; serial interface adds MCU overhead and timing constraints - unsuitable for real-time 2 MSPS streaming. | Choose ADS7822U only in cost-sensitive, low-throughput designs where PCB space is constrained and serial interface is already standardized. |
Compared with AD7825BRUZ, AD7822BRUZ reduces channel capability but maintains identical speed and power profile, whereas ADS7822U trades parallel simplicity and throughput for serial interface economy - making AD7825BRUZ optimal for deterministic, multi-channel, high-speed acquisition where parallel bus resources are available.
Availability
AD7825BRUZ is available at Aetrix Electronics and suitable for disk drive servo control, DSP front-end acquisition, and mobile communication subsampling applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD7825BRUZ 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.
The AD7822/AD7825/AD7829 family was designed specifically for high-speed, low-latency data acquisition in real-time systems - emphasizing fast conversion, flexible supply operation, and minimal external component requirements.
FAQ
What is the maximum sampling rate supported by the AD7825BRUZ?
The AD7825BRUZ 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 AD7825BRUZ require an external reference voltage?
No, the AD7825BRUZ includes an on-chip 2.5 V reference with ±2% initial accuracy and 50 ppm/°C temperature coefficient. The VREF IN/OUT pin can be left unconnected for internal reference use, or decoupled with a 0.1 µF capacitor to AGND. An external reference may be applied only if tighter tolerance or lower drift is required.
How does channel selection work on the AD7825BRUZ?
Channel selection on the AD7825BRUZ is performed using the A0 and A1 address inputs - no internal register writes or configuration sequences are needed. These pins directly select among VIN1 through VIN4 in binary order (A1A0 = 00→VIN1, 01→VIN2, 10→VIN3, 11→VIN4), enabling deterministic, hardware-controlled multiplexing compatible with FPGA or microcontroller GPIO.
Can the AD7825BRUZ operate from a 3.3 V supply?
No - the AD7825BRUZ is specified only for 3 V ±10% (2.7 V to 3.3 V) and 5 V ±10% (4.5 V to 5.5 V) supplies. Operation at nominal 3.3 V falls within the 3 V ±10% range and is fully supported, including all AC/DC specifications. However, the device does not support 3.3 V ±5% or other intermediate rails outside these two defined windows.
What is the purpose of the VMID pin on the AD7825BRUZ?
The VMID pin on the AD7825BRUZ sets the common-mode center point of the analog input span. When left unconnected, it defaults to 1.25 V (for 5 V supply) or 1.0 V (for 3 V supply), establishing a 0 V–2.5 V or 0 V–2 V input range. Connecting an external voltage to VMID shifts this range - enabling single-supply op amp interfacing and compensation for system-level DC offsets without additional signal conditioning.
AD7825BRUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7825BRUZ FAQ
1.How can I place an order for AD7825BRUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7825BRUZ 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 AD7825BRUZ reliable?
The price and inventory of AD7825BRUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7825BRUZ is usually 5 days.
3.What payment methods are accepted for AD7825BRUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7825BRUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7825BRUZ?
AD7825BRUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7825BRUZ 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 AD7825BRUZ?
For technical support, including AD7825BRUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7825BRUZ requirements.
6.How does Aetrix verify that AD7825BRUZ is sourced from the original manufacturer or authorized distributors?
All AD7825BRUZ 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 AD7825BRUZ meets industry standards.
7.What is the process for return or replacement of AD7825BRUZ?
All AD7825BRUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7825BRUZ, 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 AD7825BRUZ part is unused and in its original packaging.
Return procedure for AD7825BRUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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