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Analog Devices Inc. AD7822BRZ-REEL7
- Part No.:
- AD7822BRZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7822BRZ-REEL7.pdf
- Description:
- IC ADC 8BIT PIPELINED 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,046
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Product details
Overview
AD7822BRZ-REEL7 from Analog Devices is a single-channel, 8-bit, 2 MSPS sampling ADC with 420 ns conversion time, on-chip 2.5 V reference, and track-and-hold amplifier. It operates from 3 V ±10% or 5 V ±10%, supports 0 V to 2 Vp-p (3 V supply) or 0 V to 2.5 Vp-p (5 V supply) input range, and features automatic power-down triggered via CONVST pin - used in high-speed data acquisition front ends for DSP systems and disk drive controllers.
For engineers reviewing the AD7822BRZ-REEL7 datasheet, AD7822BRZ-REEL7 pinout, AD7822BRZ-REEL7 application, or AD7822BRZ-REEL7 equivalent, key selection considerations include its 420 ns conversion time, single-ended 1-channel architecture, 3 V/5 V dual-supply compatibility, EOC-driven parallel interface timing, and VMID-adjustable input span centering - all critical for real-time subsampling and embedded acquisition designs.
Technical Context
The AD7822BRZ-REEL7 implements an 8-bit half-flash ADC architecture: a 4-bit flash stage generates MSBs, followed by a second flash stage for LSBs, completing conversion in ≤420 ns. Its track-and-hold acquires input in ≤200 ns and supports full-scale signals up to 10 MHz, enabling subsampling applications without external anti-alias filtering.
It integrates a 2.5 V ±2% on-chip reference, flexible parallel interface with CS/RD/EOC control, and dual-mode power management - automatic power-down at conversion end (via CONVST sampling) and dedicated PD pin. Channel selection is not applicable (single-input), eliminating address decoding overhead in microprocessor interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes with no missing codes guaranteed over temperature. |
| Max Throughput | 2 MSPS - enables real-time digitization of signals up to 10 MHz (full-power bandwidth) for subsampling architectures. |
| Conversion Time | 420 ns max - defines minimum inter-conversion interval; allows maximum DSP processing time per sample. |
| 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 - sufficient for medium-fidelity acquisition in disk drive servo loops and mobile comms baseband. |
| Power Consumption | 12 mA max @ 5 V normal operation; 5 μA max in power-down - enables low-duty-cycle burst acquisition in battery-sensitive systems. |
| Reference | On-chip 2.5 V ±50 mV (±2%) - eliminates external reference component; VREF IN/OUT pin supports external override if needed. |
Pinout & Package
AD7822BRZ-REEL7 is housed in a 20-lead, 0.3" wide, plastic SOIC package (SO-20), RoHS-compliant and tape-and-reel packaged (REEL7). Pin layout matches standard SOIC-20 footprint with exposed pad not present.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Analog Input Channel | Single-ended analog input; accepts 0 V to 2.5 Vp-p (5 V supply) or 0 V to 2 Vp-p (3 V supply); referenced to AGND. |
| CONVST | Convert Start / Power Control | Falling edge initiates conversion and places T/H in hold mode; state sampled at EOC high to trigger automatic power-down. |
| EOC | End-of-Conversion Output | Active-low pulse (≥70 ns wide) signals completion; used to interrupt µP or latch data without external timing logic. |
| RD | Read Strobe Input | Active-low signal enables DB0–DB7 output drivers only when CS is also low - ensures bus contention avoidance in shared-data systems. |
| CS | Chip Select Input | Enables parallel port; must be low with RD to drive data - essential for multi-device data bus arbitration. |
| PD | Power-Down Input | Logic-low forces immediate power-down; complements automatic CONVST-based shutdown for deterministic low-power sequencing. |
| DB0–DB7 | Parallel Data Outputs | 8-bit straight-binary outputs; tri-state when RD or CS high - compatible with 8051, PIC, and ADSP-21xx microcontrollers. |
| VREF IN/OUT | Reference I/O | Provides access to internal 2.5 V reference; can accept external 2.5 V source for improved accuracy or temperature stability. |
| VMID | Input Span Center | Adjusts analog input common-mode level from AGND to VDD; default = 1.25 V (5 V) or 1.0 V (3 V) when unconnected. |
| AGND / DGND | Analog & Digital Grounds | Separate ground pins minimize digital switching noise coupling into analog path; recommended to tie together at single point near device. |
| VDD | Supply Voltage | Accepts 2.7–3.3 V or 4.5–5.5 V; internal detector auto-configures input range and reference scaling accordingly. |
Key Features
| Feature | Design Value |
|---|---|
| 420 ns conversion time | Enables 2 MSPS throughput while leaving >50% of each 500 ns cycle for downstream DSP processing or memory write operations. |
| VMID-adjustable input span | Allows analog input range centering anywhere between AGND and VDD - reduces need for external op-amp level-shifting in single-supply sensor interfaces. |
| 10 MHz full-power bandwidth | Supports undersampling of IF signals (e.g., 45 MHz GSM IF) without external anti-alias filter - simplifies RF front-end design. |
| Automatic power-down on CONVST | Reduces average current to <1 μA between conversions in burst-mode acquisition - extends battery life in portable test equipment. |
| On-chip 2.5 V reference (±2%) | Eliminates external reference IC and decoupling components; maintains ±0.75 LSB INL over −40°C to +85°C industrial range. |
Applications
| Disk Drive Servo Control | DSP-Based Signal Acquisition |
|---|---|
|
Use Scenario: Real-time position error signal (PES) sampling from read/write head preamplifier outputs during track-following. IC Role / Device Role / Timing Role: Single-channel ADC capturing analog PES at ≥1 MSPS to feed closed-loop servo algorithm in DSP. Use Value: 420 ns conversion time ensures minimal latency in feedback loop; 0 V to 2.5 Vp-p input range matches typical preamp output swing. |
Use Scenario: Digitizing baseband I/Q signals in mobile communication transceivers before FFT processing. IC Role / Device Role / Timing Role: Front-end ADC providing 2 MSPS samples to ADSP-21xx or similar fixed-point DSP with parallel bus interface. Use Value: EOC pulse directly triggers DSP DMA or interrupt; VMID adjustment accommodates varying DC offsets across I/Q paths. |
| Portable Test Equipment | Industrial Data Logger |
|
Use Scenario: Battery-powered handheld oscilloscope capturing transient waveforms up to 10 MHz using subsampling technique. IC Role / Device Role / Timing Role: High-speed ADC operating in low-duty-cycle burst mode, powered down between acquisitions. Use Value: 5 μA power-down current extends battery life; 10 MHz FPBW enables alias-free reconstruction of higher-frequency signals. |
Use Scenario: Multi-sensor monitoring system logging vibration, temperature, and pressure in factory automation nodes. IC Role / Device Role / Timing Role: Centralized ADC acquiring conditioned analog sensor outputs at programmable rates up to 2 MSPS. Use Value: On-chip 2.5 V reference ensures consistent measurement accuracy across units; SOIC-20 package supports automated PCB assembly. |
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 |
|---|---|---|---|
| AD7825BRZ-REEL7 | 4-channel version with A0/A1 address inputs; identical conversion time, reference, and power specs; adds channel multiplexing logic. | Requires external address control for channel selection; suitable where multiple sensors share one ADC instead of dedicated per-channel conversion. | Select AD7825BRZ-REEL7 only if multi-channel sampling with shared T/H is required; AD7822BRZ-REEL7 avoids address decoding complexity and reduces BOM count for single-signal use. |
| MAX1186EEE+ | 8-bit, 2 MSPS, but uses successive approximation (SAR) architecture; 1.25 μs conversion time; requires external reference; no VMID pin. | Lacks subsampling capability due to lower FPBW (~1.5 MHz); higher latency limits real-time control loop performance. | Choose MAX1186EEE+ only if lower power (3.5 mA active) and smaller 16-pin QSOP package outweigh need for 420 ns speed and 10 MHz bandwidth. |
Compared with AD7825BRZ-REEL7, AD7822BRZ-REEL7 eliminates channel-address logic and reduces pin count, simplifying layout and firmware; versus MAX1186EEE+, it delivers 3× faster conversion and 6.7× higher full-power bandwidth - critical for closed-loop control and IF sampling where timing determinism is non-negotiable.
Availability
AD7822BRZ-REEL7 is available at Aetrix Electronics and suitable for disk drive servo control, portable test instrumentation, industrial data loggers, and DSP front-end acquisition requiring stable component supply across extended product lifecycles.
Supply support for AD7822BRZ-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, serving industrial, automotive, communications, and healthcare markets.
The AD7822BRZ-REEL7 belongs to the AD782x family of high-speed, low-latency sampling ADCs designed specifically for real-time data acquisition in DSP-centric systems - emphasizing minimal conversion delay, integrated reference, and seamless microprocessor interfacing.
FAQ
What is the maximum input frequency supported by the AD7822BRZ-REEL7 without aliasing?
The AD7822BRZ-REEL7 has a full-power bandwidth (FPBW) of 10 MHz, meaning it can accurately digitize full-scale sine-wave inputs up to that frequency. However, to avoid aliasing, Nyquist criterion requires sampling ≥2× the highest input frequency component. At 2 MSPS, the theoretical Nyquist limit is 1 MHz - so for baseband applications, input must be band-limited to ≤1 MHz. For subsampling, the AD7822BRZ-REEL7's 10 MHz FPBW enables digitization of higher IF signals (e.g., 45 MHz) when combined with appropriate anti-imaging filtering and digital downconversion.
Does the AD7822BRZ-REEL7 require an external reference voltage?
No, the AD7822BRZ-REEL7 includes an on-chip 2.5 V reference with ±2% initial accuracy and 50 ppm/°C temperature coefficient, accessible at the VREF IN/OUT pin. This eliminates the need for an external reference in most applications. However, the pin supports connection of a precision external 2.5 V source (e.g., AD780) when tighter reference stability or lower drift is required - the internal reference is automatically disabled when external voltage is applied.
How does the automatic power-down feature work on the AD7822BRZ-REEL7?
The AD7822BRZ-REEL7 samples the logic level on the CONVST pin at the moment the EOC signal goes high (end of conversion). If CONVST is low at that instant, the device enters power-down mode, reducing supply current to ≤5 μA. This occurs autonomously without software intervention. To re-enable, a rising edge on CONVST (or PD pin) wakes the device. This feature is ideal for burst-mode acquisition where conversions occur infrequently but must complete rapidly when triggered.
What is the purpose of the VMID pin on the AD7822BRZ-REEL7?
The VMID pin sets the centerpoint of the AD7822BRZ-REEL7's analog input voltage range. With no connection, VMID defaults to 1.25 V (5 V supply) or 1.0 V (3 V supply), yielding input ranges of 0 V–2.5 Vp-p or 0 V–2 Vp-p. Connecting VMID to another voltage (e.g., 2.0 V) shifts the entire input span - e.g., to 0.75 V–3.25 Vp-p - enabling direct interfacing with single-supply op amps or accommodating system-level DC offsets without external level-shifting circuitry.
Can the AD7822BRZ-REEL7 interface directly with an 8051 microcontroller?
Yes, the AD7822BRZ-REEL7 is explicitly designed for microprocessor compatibility. Its parallel 8-bit interface (DB0–DB7), active-low RD and CS inputs, and EOC interrupt signal align with 8051 timing requirements. Application note AN-282 details direct connection: EOC connects to INT0, RD to WR, CS to a decoded address line, and CONVST to any GPIO. The 420 ns conversion time and 70 ns EOC pulse width meet 8051's minimum strobe timing when operated at ≥12 MHz clock.
AD7822BRZ-REEL7 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-REEL7 FAQ
1.How can I place an order for AD7822BRZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7822BRZ-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 AD7822BRZ-REEL7 reliable?
The price and inventory of AD7822BRZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7822BRZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7822BRZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7822BRZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7822BRZ-REEL7?
AD7822BRZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7822BRZ-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 AD7822BRZ-REEL7?
For technical support, including AD7822BRZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7822BRZ-REEL7 requirements.
6.How does Aetrix verify that AD7822BRZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7822BRZ-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 AD7822BRZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7822BRZ-REEL7?
All AD7822BRZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7822BRZ-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 AD7822BRZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7822BRZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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