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Analog Devices Inc. AD7822BRZ-REEL
- Part No.:
- AD7822BRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7822BRZ-REEL.pdf
- Description:
- IC ADC 8BIT PIPELINED 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,506
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Product details
Overview
AD7822BRZ-REEL from Analog Devices is an 8-bit, 2 MSPS, single-channel sampling analog-to-digital converter (ADC) with on-chip track-and-hold, 2.5 V reference, and parallel interface. It operates from 3 V ±10% or 5 V ±10%, delivers 420 ns conversion time, and supports 0 V to 2 Vp-p (3 V supply) or 0 V to 2.5 Vp-p (5 V supply) input ranges - used in DSP front ends and mobile communication subsampling systems.
For engineers reviewing the AD7822BRZ-REEL datasheet, AD7822BRZ-REEL pinout, AD7822BRZ-REEL application, or AD7822BRZ-REEL equivalent, key selection considerations include its single-ended 1-channel architecture, automatic power-down via CONVST, EOC-driven standalone operation, and compatibility with microprocessor/DSP parallel buses requiring sub-500 ns timing margins.
Technical Context
The AD7822BRZ-REEL implements a half-flash ADC architecture with two-stage conversion: a 4-bit coarse flash followed by a 4-bit fine flash, achieving full 8-bit resolution in ≤420 ns. Its track-and-hold acquires input for 200 ns and supports full-power bandwidth up to 10 MHz, enabling accurate subsampling of RF-adjacent signals.
It integrates a 2.5 V ±2% on-chip reference, VMID-based input span centering (AGND to VDD), and dual power-down control - automatic (via CONVST logic level sampled at EOC high) and explicit (via dedicated PD pin). The parallel interface uses CS/RD gating and outputs straight-binary DB0–DB7 data with EOC pulse signaling.
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 acquisition in high-speed DSP front ends and disk drive servo loops. |
| Conversion Time | 420 ns max - defines minimum inter-conversion interval and sets hard timing budget for RD/CS setup/hold. |
| Input Span | 0 V to 2.5 Vp-p @ 5 V supply or 0 V to 2 Vp-p @ 3 V supply - auto-detected by internal VDD comparator; centered via VMID pin. |
| SNR | 48 dB min @ fIN = 30 kHz, fSAMPLE = 2 MHz - confirms usable dynamic range for baseband signal digitization. |
| Power Consumption | 12 mA max normal operation @ 5 V; 5 μA max power-down - supports low-duty-cycle burst acquisition in portable systems. |
| Reference | On-chip 2.5 V ±50 mV, 50 ppm/°C - eliminates external reference component while maintaining DC accuracy within ±2 LSB gain error. |
Pinout & Package
AD7822BRZ-REEL is housed in a 20-lead, 0.3" wide, plastic SOIC package (SO-20), RoHS-compliant and tape-and-reel packaged per REEL suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Analog Input Channel | Single-ended input for the sole analog channel; accepts 0 V to VDD range, centered by VMID. |
| CONVST | Convert Start / Power-Down Control | Falling edge initiates conversion and places T/H in hold mode; logic level sampled at EOC high determines auto power-down. |
| EOC | End-of-Conversion Output | Active-low pulse (min 70 ns, max 110 ns) signals valid data ready; used for microcontroller interrupt or latch enable. |
| RD | Read Strobe Input | Active-low signal, gated with CS, enables DB0–DB7 output drivers to drive parallel data bus. |
| CS | Chip Select Input | Active-low enable for parallel interface; required when sharing data bus with other peripherals. |
| PD | Power-Down Input | Active-low pin forces immediate low-power state; independent of CONVST behavior (AD7822-specific). |
| DB0–DB7 | Parallel Data Outputs | Tri-state outputs delivering straight-binary 8-bit result; high-impedance when RD or CS is high. |
| VREF IN/OUT | Reference I/O | Provides access to internal 2.5 V reference or accepts external reference; decoupling to AGND recommended. |
| VMID | Input Span Center Voltage | Defines midpoint of analog input range; default = 1.25 V @ 5 V, 1.0 V @ 3 V; allows offset adjustment for single-supply op amp interfaces. |
| VDD | Positive Supply | Accepts 2.7 V to 5.5 V; internal detector selects input range and reference scaling automatically. |
| AGND / DGND | Analog & Digital Grounds | Separate pins minimize digital switching noise coupling into analog path; connected at single point near device. |
Key Features
| Feature | Design Value |
|---|---|
| 420 ns conversion time | Enables ≥2 MSPS sustained throughput without pipeline latency, maximizing DSP processing window in real-time systems. |
| On-chip 2.5 V reference | Eliminates need for external precision reference, reducing BOM count and layout area while maintaining ±50 mV initial accuracy. |
| VMID-adjustable input span | Allows analog input range to be centered anywhere between AGND and VDD - simplifies interface with single-supply op amps and compensates system offsets. |
| Automatic power-down via CONVST | Reduces average current to ≤5 μA between conversions without external control logic - ideal for battery-powered burst-mode acquisition. |
| 10 MHz full-power bandwidth | Supports faithful digitization of IF signals up to 10 MHz, making AD7822BRZ-REEL suitable for undersampling architectures in mobile comms. |
Applications
| Disk Drive Servo Control | DSP Front-End Acquisition |
|---|---|
Use Scenario: Real-time position error signal (PES) sampling from read/write head preamp in HDD actuator loop. IC Role / Device Role / Timing Role: Single-channel ADC capturing analog PES at ≥1 MSPS to feed closed-loop PID controller. Use Value: 420 ns conversion time ensures minimal loop delay; 8-bit resolution meets servo accuracy requirements; 3 V operation matches modern low-voltage drive electronics. |
Use Scenario: Digitizing baseband I/Q signals prior to FFT or filtering in embedded DSP systems. IC Role / Device Role / Timing Role: High-speed parallel-output ADC interfacing directly to ADSP-21xx or similar DSP data bus. Use Value: EOC pulse synchronizes data capture without polling; straight-binary output avoids format translation; on-chip reference reduces external components. |
| Mobile Communication Subsampling | Industrial Data Logger |
Use Scenario: Undersampling 20–50 MHz IF signals in GSM/EDGE receiver front end using bandpass sampling. IC Role / Device Role / Timing Role: 10 MHz FPBW ADC capturing aliased spectrum with SNR ≥48 dB at 30 kHz input. Use Value: Full-power bandwidth supports clean subsampling; automatic power-down extends battery life during idle intervals between bursts. |
Use Scenario: Low-power periodic voltage monitoring in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Standalone ADC triggered by timer interrupt, storing results in local RAM before host readout. Use Value: Flexible 3 V/5 V supply accommodates legacy and modern industrial rails; VMID pin enables direct connection to sensor output without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, high-speed sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7825BRZ-REEL | 4-channel version in 24-lead SOIC; identical conversion speed, reference, and interface; adds A0/A1 address inputs. | Requires multiplexer control logic and additional PCB routing for channel selection; not pin-compatible. | Select AD7825BRZ-REEL only when multi-channel sampling with shared T/H is needed - avoid for single-input designs due to pinout and layout overhead. |
| MAX1186EEE+T | 8-bit, 2 MSPS, single-channel ADC from Maxim; 3 V only, no on-chip reference, requires external 2.048 V ref; SPI interface instead of parallel. | Needs external reference and level-shifting for 5 V systems; serial interface reduces pin count but increases software overhead and latency. | Choose MAX1186EEE+T only if board space is constrained and SPI is preferred; AD7822BRZ-REEL offers faster parallel access and integrated reference for simpler, lower-latency designs. |
Compared with AD7825BRZ-REEL, AD7822BRZ-REEL saves PCB area and eliminates channel-address logic; compared with MAX1186EEE+T, it provides guaranteed 5 V compatibility, zero-ref design margin, and deterministic sub-500 ns parallel readout - critical for time-critical interrupt-driven acquisition.
Availability
AD7822BRZ-REEL 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 across extended production lifecycles.
Supply support for AD7822BRZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7822BRZ-REEL belongs to the AD782x family of high-speed sampling ADCs designed specifically for real-time data acquisition in resource-constrained embedded systems where speed, power efficiency, and integration are critical.
FAQ
What is the maximum sampling rate supported by the AD7822BRZ-REEL?
The AD7822BRZ-REEL supports a maximum throughput of 2 MSPS, limited by its 420 ns maximum conversion time. This rate is achievable under specified conditions: VDD = 3 V ±10% or 5 V ±10%, −40°C to +85°C, with proper timing margins for CONVST, RD, and CS signals as defined in Table 2 of the datasheet. Sustained operation at 2 MSPS requires careful PCB layout to minimize bus loading and ground bounce.
Does the AD7822BRZ-REEL require an external reference voltage?
No, the AD7822BRZ-REEL includes an on-chip 2.5 V reference with ±50 mV initial accuracy and 50 ppm/°C temperature coefficient. The VREF IN/OUT pin can be left unconnected for internal reference use or decoupled to AGND with a 0.1 µF capacitor. An external reference may be applied only if higher precision or different voltage is required - but doing so disables the internal reference and requires external buffering.
How does power-down work on the AD7822BRZ-REEL?
The AD7822BRZ-REEL supports two power-down modes: (1) automatic, triggered when CONVST is sampled low at EOC high - ending each conversion in low-power state; and (2) explicit, via the PD pin driven low. Both reduce supply current to ≤5 μA. Recovery time is 25 µs (on-chip ref) or 1 µs (external ref); the PD pin is specific to AD7822/AD7825 and absent on AD7829.
Can the AD7822BRZ-REEL interface directly with a 5 V microcontroller?
Yes, the AD7822BRZ-REEL is fully compatible with 5 V microcontrollers when operated at VDD = 5 V ±10%. Its logic inputs accept VIH ≥2.4 V and VIL ≤0.8 V; outputs drive VOH ≥4.0 V (ISOURCE = 200 µA) and VOL ≤0.4 V (ISINK = 200 µA). No level-shifting is needed - but ensure AGND and DGND are properly partitioned and joined at a single point near the ADC.
What is the purpose of the VMID pin on the AD7822BRZ-REEL?
The VMID pin sets the center voltage of the AD7822BRZ-REEL's analog input range. With VMID unconnected, default centering is 1.25 V (5 V supply) or 1.0 V (3 V supply), yielding input spans of 0–2.5 Vp-p or 0–2 Vp-p. Connecting VMID to an external voltage (e.g., from a DAC or resistor divider) shifts the entire input range linearly - enabling direct interface with single-supply op amps or compensation for system-level DC offsets without external signal conditioning.
AD7822BRZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-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:
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7822BRZ-REEL FAQ
1.How can I place an order for AD7822BRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7822BRZ-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 AD7822BRZ-REEL reliable?
The price and inventory of AD7822BRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7822BRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7822BRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7822BRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7822BRZ-REEL?
AD7822BRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7822BRZ-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 AD7822BRZ-REEL?
For technical support, including AD7822BRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7822BRZ-REEL requirements.
6.How does Aetrix verify that AD7822BRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7822BRZ-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 AD7822BRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7822BRZ-REEL?
All AD7822BRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7822BRZ-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 AD7822BRZ-REEL part is unused and in its original packaging.
Return procedure for AD7822BRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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