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Analog Devices Inc. AD7822BRU-REEL7
- Part No.:
- AD7822BRU-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7822BRU-REEL7.pdf
- Description:
- IC ADC 8BIT PIPELINED 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,422
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Product details
Overview
AD7822BRU-REEL7 from Analog Devices is a high-speed, single-channel, 8-bit analog-to-digital converter (ADC) with 420 ns conversion time, 2 MSPS throughput, on-chip 2.5 V reference, and parallel interface. It operates from 3 V ±10% or 5 V ±10% supply and features automatic power-down triggered by CONVST pin state at end-of-conversion - used in DSP front ends and mobile communication subsampling systems.
For engineers reviewing the AD7822BRU-REEL7 datasheet, AD7822BRU-REEL7 pinout, AD7822BRU-REEL7 application, or AD7822BRU-REEL7 equivalent, key selection considerations include its 1-channel configuration, 420 ns conversion time, 3 V/5 V dual-supply compatibility, track-and-hold acquisition time of 200 ns, and EOC-synchronized parallel read interface for microprocessor/DSP interfacing.
Technical Context
The AD7822BRU-REEL7 implements an 8-bit half-flash ADC architecture with two-stage conversion: a 4-bit coarse flash followed by a 4-bit fine flash, completing within 420 ns max. Its track-and-hold amplifier supports full-power bandwidth up to 10 MHz and acquisition time of 200 ns after channel change or input step.
It integrates on-chip 2.5 V reference (±50 mV error), VMID-based input span centering (0 V to 2 V p-p at 3 V, 0 V to 2.5 V p-p at 5 V), and flexible parallel control logic with shared CONVST/POWER-DOWN functionality - no separate PD pin required, unlike AD7825.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes for digitizing analog signals with sufficient granularity for medium-speed data acquisition. |
| Max Conversion Time | 420 ns - enables 2 MSPS sampling rate, maximizing real-time DSP processing window per sample. |
| Supply Voltage Range | 3 V ±10% or 5 V ±10% - supports dual-voltage system integration without external level-shifting. |
| Analog Input Span | 0 V to 2 V p-p (at 3 V) or 0 V to 2.5 V p-p (at 5 V) - configurable via VMID pin to center span anywhere between AGND and VDD. |
| On-Chip Reference | 2.5 V ±50 mV - eliminates need for external reference in cost-sensitive applications; decoupling optional. |
| Track-and-Hold Acquisition Time | 200 ns - defines minimum delay required after channel selection or input step before valid conversion start. |
| Signal-to-(Noise + Distortion) | 48 dB min at fIN = 30 kHz - confirms usable dynamic range for baseband and subsampling RF front ends. |
| Power Dissipation (3 V) | 36 mW max in normal operation - enables low-power portable instrumentation and battery-backed systems. |
Pinout & Package
AD7822BRU-REEL7 is housed in a 20-lead, 0.3" wide, thin shrink small outline package (TSSOP), RoHS-compliant and tape-and-reel packaged (REEL7 suffix). Pin count and layout match industry-standard 20-pin TSSOP footprint with 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Analog Input Channel | Single-ended analog input; accepts 0 V to 2 V p-p (3 V supply) or 0 V to 2.5 V p-p (5 V supply). |
| CONVST | Convert Start / Power-Down Control | Falling edge initiates conversion; sampled at EOC high to auto-enter power-down if logic low. |
| EOC | End-of-Conversion Output | Active-low pulse indicates conversion completion; used to trigger microcontroller interrupt or latch data. |
| RD | Read Strobe Input | Active-low signal enabling DB0–DB7 outputs when CS is also low; controls data bus timing. |
| CS | Chip Select Input | Enables parallel port; must be low with RD to drive data onto shared bus. |
| DB0–DB7 | Parallel Data Outputs | 8-bit straight-binary output bus; tri-state when RD or CS is high. |
| VREF IN/OUT | Reference Input/Output | Provides access to internal 2.5 V reference; can accept external reference if needed. |
| VMID | Input Span Centering | Sets midpoint voltage of analog input range; default = 1.0 V (3 V) or 1.25 V (5 V) when unconnected. |
| VDD | Positive Supply | 3 V ±10% or 5 V ±10%; powers analog and digital sections from single rail. |
| AGND / DGND | Analog & Digital Grounds | Separate ground pins minimize noise coupling; recommended to tie together at single point near device. |
Key Features
| Feature | Design Value |
|---|---|
| 420 ns conversion time | Enables 2 MSPS throughput - critical for real-time DSP front ends and high-speed data capture. |
| On-chip 2.5 V reference | Reduces BOM count and PCB area; ±50 mV initial error and 50 ppm/°C drift support stable DC accuracy. |
| Automatic power-down | Eliminates need for external control logic - power drops from 12 mA to 5 µA automatically post-conversion. |
| VMID-adjustable input span | Allows offset compensation for single-supply op amps and system-level DC offsets without external circuitry. |
| 10 MHz full-power bandwidth | Supports undersampling of IF signals in mobile comms and spectrum analysis applications. |
| Flexible parallel interface | Standalone operation possible using EOC and CONVST only - no microcontroller required for basic sampling. |
Applications
| Portable Data Acquisition | DSP Front-End Interface |
|---|---|
|
Use Scenario: Battery-powered handheld test equipment acquiring sensor signals (e.g., temperature, pressure) at up to 2 MSPS. IC Role / Device Role / Timing Role: Single-channel ADC digitizing conditioned analog inputs; EOC synchronizes sample capture with low-latency host response. Use Value: 420 ns conversion + 5 µA power-down current extends battery life while maintaining real-time responsiveness. |
Use Scenario: Real-time signal conditioning stage feeding ADSP-21xx or similar fixed-point DSPs in telecom baseband processing. IC Role / Device Role / Timing Role: High-speed parallel ADC providing aligned 8-bit samples directly into DSP data bus via RD/CS handshake. Use Value: 2 MSPS throughput and 200 ns track-and-hold acquisition enable deterministic pipeline latency for FIR filtering. |
| Mobile Communication Subsampling | Disk Drive Read Channel |
|
Use Scenario: IF sampling in GSM/EDGE receivers where 10 MHz FPBW allows direct digitization of 45–90 MHz bands. IC Role / Device Role / Timing Role: Undersampling ADC capturing band-limited RF signals; VMID adjusts DC offset from mixer output. Use Value: 48 dB SNR at 30 kHz and −70 dB channel isolation ensure clean digitization despite adjacent-channel interference. |
Use Scenario: Analog front end in HDD servo control loops requiring fast, repeatable position error signal (PES) sampling. IC Role / Device Role / Timing Role: Low-latency ADC converting head-position feedback; automatic power-down minimizes thermal drift between samples. Use Value: ±0.75 LSB INL/DNL and ±2 LSB gain error ensure consistent PES quantization across temperature and supply variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7825BRU-REEL7 | 4-channel variant with identical 420 ns conversion time, same TSSOP-24 package, adds A0/A1 address pins and PD pin. | Requires multiplexer control logic and additional PCB routing; suited for multi-sensor monitoring where channel count >1. | Select AD7825BRU-REEL7 only when simultaneous sampling across ≥2 channels is required - AD7822BRU-REEL7 offers lower pin count and simpler layout. |
| ADS7822U | TI 8-bit, 2 MSPS SAR ADC in MSOP-8; serial (SPI) interface, no on-chip reference, requires external 2.5 V ref. | Lacks parallel bus and integrated reference; better for space-constrained designs where serial interface suffices. | Choose ADS7822U for ultra-small form factor and lower I/O count; AD7822BRU-REEL7 preferred when microprocessor parallel bus access and reference integration are critical. |
Compared with AD7825BRU-REEL7, AD7822BRU-REEL7 reduces PCB complexity and component count for single-input systems; versus ADS7822U, it provides faster parallel data transfer and eliminates external reference dependency - making it optimal for embedded microprocessor-based acquisition where speed, simplicity, and integration matter.
Availability
AD7822BRU-REEL7 is available at Aetrix Electronics and suitable for portable instrumentation, DSP front ends, and disk drive read channel designs requiring stable component supply, long-term obsolescence management, and guaranteed traceability.
Supply support for AD7822BRU-REEL7 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 AD7822BRU-REEL7 belongs to the AD782x family of high-speed, low-power, microprocessor-compatible ADCs designed specifically for real-time data acquisition in DSP, communications, and industrial control systems.
FAQ
What is the maximum sampling rate supported by the AD7822BRU-REEL7?
The AD7822BRU-REEL7 supports a maximum sampling rate of 2 MSPS, derived from its 420 ns maximum conversion time. This rate is achievable across the full operating temperature range (−40°C to +85°C) and supply voltages (3 V ±10% or 5 V ±10%), provided timing constraints for CONVST pulse width, RD setup/hold, and EOC pulse width are met per Table 2 of the datasheet.
Does the AD7822BRU-REEL7 require an external reference voltage?
No, the AD7822BRU-REEL7 includes an on-chip 2.5 V reference with ±50 mV initial error 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 accuracy or different voltage is required - the internal reference is sufficient for most applications of the AD7822BRU-REEL7.
How does automatic power-down work on the AD7822BRU-REEL7?
At the end of each conversion, the AD7822BRU-REEL7 samples the logic level on the CONVST pin when the EOC signal goes high. If CONVST is low at that instant, the device enters power-down mode, reducing supply current from 12 mA typical to 5 µA max. This feature is enabled by default and requires no additional control lines - it is intrinsic to the AD7822BRU-REEL7's architecture and simplifies power management in burst-mode acquisition.
What is the function of the VMID pin on the AD7822BRU-REEL7?
The VMID pin on the AD7822BRU-REEL7 sets the center voltage of the analog input span. When unconnected, it defaults to 1.0 V (3 V supply) or 1.25 V (5 V supply), establishing a 0 V to 2 V or 0 V to 2.5 V input range. Connecting an external voltage to VMID shifts the full-scale range symmetrically around that voltage - enabling DC offset correction and compatibility with single-supply op amp stages without level-shifting circuitry.
Can the AD7822BRU-REEL7 operate standalone without a microprocessor?
Yes, the AD7822BRU-REEL7 supports standalone operation using only CONVST and EOC signals. A falling edge on CONVST starts conversion; the resulting EOC pulse can trigger a latch or flip-flop to capture DB0–DB7 outputs. No address decoding or clock synchronization is needed - this mode is explicitly documented in the Parallel Interface section and validated for use in simple data loggers or test fixtures where microprocessor overhead must be avoided.
AD7822BRU-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 2M
- Number of Inputs:
- 1
- 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:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7822BRU-REEL7 FAQ
1.How can I place an order for AD7822BRU-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7822BRU-REEL7 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 AD7822BRU-REEL7 reliable?
The price and inventory of AD7822BRU-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7822BRU-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7822BRU-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7822BRU-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7822BRU-REEL7?
AD7822BRU-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7822BRU-REEL7 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 AD7822BRU-REEL7?
For technical support, including AD7822BRU-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7822BRU-REEL7 requirements.
6.How does Aetrix verify that AD7822BRU-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7822BRU-REEL7 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 AD7822BRU-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7822BRU-REEL7?
All AD7822BRU-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7822BRU-REEL7, 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 AD7822BRU-REEL7 part is unused and in its original packaging.
Return procedure for AD7822BRU-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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