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Analog Devices Inc. AD7825BRU
- Part No.:
- AD7825BRU
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7825BRU.pdf
- Description:
- IC ADC 8BIT 4CH 2MSPS 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,573
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Product details
Overview
AD7825BRU 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 in mobile communication systems.
For engineers reviewing the AD7825BRU datasheet, AD7825BRU pinout, AD7825BRU application, or AD7825BRU equivalent, key selection considerations include its 3 V/5 V dual-supply compatibility, automatic power-down via CONVST, flexible channel addressing (A0/A1), and industrial temperature range (−40°C to +85°C).
Technical Context
The AD7825BRU implements an 8-bit half-flash architecture with two-stage conversion: a coarse 4-bit flash stage followed by a fine 4-bit flash stage, completing within 420 ns max. Its track-and-hold acquires input signals in ≤200 ns and supports full-power bandwidth up to 10 MHz.
It features a single-conversion-start/power-down pin (CONVST) that samples logic level at EOC assertion to enable automatic power-down; additionally, it includes a dedicated PD pin for explicit low-power control - a capability shared only with AD7822 and AD7825, not AD7829.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - guarantees no missing codes over full operating range. |
| Max Throughput | 2 MSPS - enables real-time sampling of baseband and IF signals in communications systems. |
| Conversion Time | 420 ns max - defines minimum inter-conversion interval for sustained high-speed acquisition. |
| Analog Input Channels | 4 single-ended - selectable via A0/A1 address inputs without register writes. |
| Supply Voltage Range | 3 V ±10% or 5 V ±10% - supports dual-voltage system integration without level-shifting. |
| On-Chip Reference | 2.5 V ±50 mV - eliminates need for external reference in cost-sensitive designs; buffered output available at VREF IN/OUT. |
| Power Dissipation | 24 mW typical at 3 V - enables low-power portable instrumentation and battery-backed data loggers. |
Pinout & Package
The AD7825BRU is packaged in a 24-lead, 0.3" wide SOIC (Small Outline Integrated Circuit) - RoHS-compliant, surface-mountable, with standard JEDEC MS-013AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN4 | Analog Input Channels | Four single-ended inputs; span = 2.5 V @ 5 V supply or 2.0 V @ 3 V supply, centered by VMID. |
| CONVST | Convert Start / Power-Down Control | Falling edge initiates conversion; logic state sampled at EOC high to auto-enter power-down mode. |
| PD | Explicit Power-Down Input | Low-active signal forces immediate shutdown - independent of CONVST timing, enabling deterministic low-power sequencing. |
| A0, A1 | Channel Address Inputs | Selects VIN1–VIN4 prior to RD assertion; no internal register required - simplifies microcontroller interface. |
| EOC | End-of-Conversion Output | Active-low pulse indicates data validity; used to trigger interrupt or latch data in standalone operation. |
| RD, CS | Parallel Bus Enable Controls | Both must be low to drive DB0–DB7; supports shared data bus architectures with address decoding. |
| DB0–DB7 | 8-Bit Parallel Data Outputs | High-impedance when inactive; driven after RD/CS assertion - compatible with 5 V and 3 V logic families. |
| VREF IN/OUT | Reference I/O Terminal | Provides access to internal 2.5 V reference or accepts external reference - decoupling to AGND improves noise immunity. |
| VMID | Analog Input Span Centering | Sets common-mode voltage for all channels; default = 1.25 V @ 5 V or 1.0 V @ 3 V - enables single-supply op amp interfacing. |
| VDD, AGND, DGND | Power & Ground Rails | Separate analog/digital grounds reduce coupling noise; VDD tolerance allows direct connection to regulated 3.3 V or 5 V rails. |
Key Features
| Feature | Design Value |
|---|---|
| 420 ns conversion time | Enables ≥2 MSPS sustained sampling - critical for real-time DSP front ends and disk drive servo loops. |
| Automatic power-down via CONVST | Reduces average current to <5 µA between conversions - extends battery life without software overhead. |
| On-chip 2.5 V reference (±2%) | Eliminates external reference IC and associated layout area - lowers BOM count and design risk. |
| Track-and-hold with 10 MHz FPBW | Preserves signal integrity for undersampling applications up to IF frequencies - avoids aliasing in SDR receivers. |
| Flexible 3 V/5 V operation | Supports mixed-voltage systems and legacy 5 V microcontrollers while enabling modern 3 V DSPs - no level shifters needed. |
Applications
| Mobile Communication Baseband Sampling | Disk Drive Servo Control |
|---|---|
Use Scenario: Digitizing baseband I/Q signals in GSM/EDGE transceivers with 3 V supply constraints. IC Role / Device Role / Timing Role: ADC front end capturing 2 MSPS complex samples for digital demodulation and channel estimation. Use Value: 420 ns conversion time and 10 MHz FPBW ensure accurate capture of 2.5 MHz IF signals with minimal aperture jitter. | Use Scenario: Real-time position error sensing in HDD voice coil motor (VCM) feedback loops. IC Role / Device Role / Timing Role: High-speed acquisition of head-position sensor outputs for closed-loop servo correction. Use Value: 2 MSPS throughput and 4-channel multiplexing allow simultaneous sampling of multiple position sensors per servo cycle. |
| Data Acquisition in Portable Test Equipment | Subsampling RF Receiver Front End |
Use Scenario: Battery-powered oscilloscope module digitizing 0–2.5 V analog waveforms at 2 MSPS. IC Role / Device Role / Timing Role: Standalone ADC using EOC-triggered latching and automatic power-down between triggers. Use Value: 24 mW typical power at 3 V and integrated reference reduce thermal load and simplify power management. | Use Scenario: Direct IF sampling of 45 MHz GPS L1 signal using undersampling technique. IC Role / Device Role / Timing Role: High-FPBW track-and-hold and 8-bit resolution preserving SNR >48 dB at 30 kHz input. Use Value: −70 dB channel isolation prevents crosstalk between adjacent antenna channels in multi-path receivers. |
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 |
|---|---|---|---|
| AD7822BRU | 1-channel, same 420 ns conversion, identical package and pinout except no A0/A1/PD pins. | Limited to single-signal monitoring; unsuitable for multiplexed multi-sensor systems. | Select when only one analog input is required and board space must match AD7825 footprint. |
| ADS7822U | 8-bit, 200 kSPS serial-output SAR ADC; no on-chip reference; requires external clock and reference. | Lower speed, serial interface, higher external component count - suited for low-cost, low-power sensor nodes. | Select for ultra-low-power (<1 mW) applications where 2 MSPS is unnecessary and serial interface is preferred. |
Compared with AD7822BRU, AD7825BRU adds 4-channel multiplexing and PD control at identical speed and power; compared with ADS7822U, AD7825BRU delivers 10× higher throughput, parallel interface, and integrated reference - making it optimal for real-time embedded signal processing.
Availability
AD7825BRU is available at Aetrix Electronics and suitable for data acquisition systems, disk drive servo control, and mobile communication baseband sampling requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for AD7825BRU 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 AD782x family was engineered for high-speed, low-power, microprocessor-compatible data acquisition - targeting real-time DSP interfaces, communications infrastructure, and precision industrial measurement.
FAQ
What is the maximum sampling rate supported by the AD7825BRU?
The AD7825BRU 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 both 3 V and 5 V supply conditions, as verified in the Rev. C datasheet timing characteristics table.
Does the AD7825BRU require an external reference voltage?
No, the AD7825BRU includes an on-chip 2.5 V reference with ±2% initial accuracy and 50 ppm/°C temperature coefficient. The VREF IN/OUT pin provides access to this reference; it may be left unconnected or decoupled to AGND with a 0.1 µF capacitor. An external reference can be applied if higher precision is required.
How does channel selection work on the AD7825BRU without register writes?
The AD7825BRU uses hardwired address inputs A0 and A1 to select among VIN1–VIN4. Prior to asserting RD, the user drives the desired binary code (00–11) onto A0/A1; the selected channel is sampled on the falling edge of CONVST. No internal configuration register or SPI/I²C interface is involved - enabling simple GPIO-based control.
What is the purpose of the VMID pin on the AD7825BRU?
The VMID pin sets the center voltage of the analog input span. With VDD = 5 V, default span is 0–2.5 V centered at 1.25 V; with VDD = 3 V, it is 0–2.0 V centered at 1.0 V. Connecting VMID to an external voltage shifts the entire input range - allowing single-supply op amps to drive the AD7825BRU without level-shifting circuitry.
Can the AD7825BRU operate in standalone mode without a microprocessor?
Yes, the AD7825BRU supports standalone operation using its EOC pulse and CONVST-controlled power-down. A monostable or counter can generate periodic CONVST pulses; EOC then signals data readiness to latch into external registers. No address decoding or bus arbitration is required - confirmed in the Parallel Interface and Standalone Operation sections of the Rev. C datasheet.
AD7825BRU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 2M
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- Parallel
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7825BRU FAQ
1.How can I place an order for AD7825BRU through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7825BRU 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 AD7825BRU reliable?
The price and inventory of AD7825BRU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7825BRU is usually 5 days.
3.What payment methods are accepted for AD7825BRU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7825BRU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7825BRU?
AD7825BRU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7825BRU 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 AD7825BRU?
For technical support, including AD7825BRU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7825BRU requirements.
6.How does Aetrix verify that AD7825BRU is sourced from the original manufacturer or authorized distributors?
All AD7825BRU 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 AD7825BRU meets industry standards.
7.What is the process for return or replacement of AD7825BRU?
All AD7825BRU units undergo pre-shipment inspection (PSI). If there is an issue with AD7825BRU, 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 AD7825BRU part is unused and in its original packaging.
Return procedure for AD7825BRU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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