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Analog Devices Inc. AD7822BRUZ
- Part No.:
- AD7822BRUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7822BRUZ.pdf
- Description:
- IC ADC 8BIT PIPELINED 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,840
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Product details
Overview
AD7822BRUZ from Analog Devices is a single-channel, 8-bit, 2 MSPS analog-to-digital converter (ADC) featuring a 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% supplies and delivers 48 dB SNR at 30 kHz input, supporting high-speed data acquisition in DSP front ends and mobile communication systems.
For engineers reviewing the AD7822BRUZ datasheet, AD7822BRUZ pinout, AD7822BRUZ application, or AD7822BRUZ equivalent, key selection considerations include its 1-channel architecture, automatic power-down via CONVST, flexible parallel interface with EOC signaling, and VMID-adjustable input span for single-supply signal conditioning.
Technical Context
The AD7822BRUZ implements an 8-bit half-flash ADC architecture with two-stage conversion: a 4-bit coarse flash stage followed by a 4-bit fine 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, enabling subsampling of RF/IF signals.
It integrates a 2.5 V ±2% on-chip reference, configurable analog input range (0–2 V p-p at 3 V, 0–2.5 V p-p at 5 V), and dual power-down control-automatic (via CONVST sampling at EOC) and explicit (via dedicated PD pin). The parallel interface uses active-low CS and RD with high-impedance outputs and EOC pulse for microprocessor interrupt synchronization.
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 sampling of baseband and IF signals in communications and test equipment. |
| Conversion Time | 420 ns max - defines minimum inter-conversion interval; critical for burst-mode acquisition timing. |
| SNR @ 30 kHz | 48 dB min - determines dynamic range for low-distortion digitization of audio and sensor signals. |
| INL / DNL | ±0.75 LSB max each - ensures monotonicity and linearity for precision measurement applications. |
| Supply Range | 2.7–3.3 V or 4.5–5.5 V - supports dual-voltage system integration without level-shifting circuitry. |
| Power Dissipation | 36 mW max at 3 V (normal operation) - enables battery-powered portable instrumentation with low thermal load. |
Pinout & Package
AD7822BRUZ is housed in a 20-lead TSSOP package (RU-20), 4.4 mm × 6.5 mm, 0.65 mm pitch, with exposed pad for thermal enhancement. Pin 1 marked with dot; pin 10 is NC (no connect).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 | Analog Input Channel | Single-ended input for the sole analog channel; accepts 0–2 V p-p (3 V supply) or 0–2.5 V p-p (5 V supply). |
| CONVST | Convert Start / Power-Down Control | Falling edge initiates conversion; sampled at EOC to enable automatic power-down if logic low. |
| EOC | End-of-Conversion Output | Active-low pulse indicates valid data ready; used to trigger microcontroller ISR or latch data. |
| RD | Read Strobe Input | Active-low signal enables output drivers; must be gated with CS to drive DB0–DB7 onto shared bus. |
| CS | Chip Select Input | Enables parallel port; required when sharing data bus with other peripherals to prevent contention. |
| DB0–DB7 | Parallel Data Outputs | Tri-state CMOS outputs; present 8-bit result only when both RD and CS are asserted low. |
| VREF IN/OUT | Reference I/O | Provides access to internal 2.5 V reference; can accept external reference for improved accuracy/stability. |
| VMID | Input Span Centering | Sets common-mode voltage for analog input range; default = 1.0 V (3 V) or 1.25 V (5 V) when unconnected. |
| PD | Power-Down Input | Active-low pin forces immediate low-power state; complements automatic power-down via CONVST. |
| AGND / DGND | Analog & Digital Grounds | Separate ground pins minimize digital switching noise coupling into sensitive analog path. |
Key Features
| Feature | Design Value |
|---|---|
| 420 ns conversion time | Enables 2 MSPS throughput while preserving >10 MHz full-power bandwidth for subsampling applications. |
| On-chip 2.5 V reference (±2%) | Eliminates need for external reference IC, reducing BOM count and PCB area in space-constrained designs. |
| VMID-adjustable input span | Allows centering of 2 V or 2.5 V input range anywhere between AGND and VDD, easing single-supply op amp interfacing. |
| Automatic power-down via CONVST | Reduces average current to 5 µA between conversions without requiring additional control logic or GPIO. |
| Channel-to-channel isolation | −70 dB typ ensures minimal crosstalk in multi-signal environments-even though AD7822BRUZ is single-channel, this spec reflects family-level design robustness. |
Applications
| Data Acquisition Systems | DSP Front Ends |
|---|---|
|
Use Scenario: High-speed sampling of sensor outputs (e.g., vibration, temperature, pressure) in industrial PLCs and portable test equipment. IC Role / Device Role / Timing Role: Primary ADC capturing analog transducer signals at up to 2 MSPS with minimal latency and deterministic timing via EOC pulse. Use Value: 420 ns conversion time maximizes available DSP processing time per sample; on-chip reference simplifies calibration across temperature. |
Use Scenario: Digitizing baseband I/Q signals prior to FFT or filtering in software-defined radio and modem subsystems. IC Role / Device Role / Timing Role: Real-time analog front-end ADC synchronized to DSP clock domain using EOC-triggered DMA or interrupt. Use Value: 10 MHz full-power bandwidth supports undersampling of IF signals; 48 dB SNR preserves signal integrity for subsequent digital processing. |
| Disk Drive Read Channels | Mobile Communication Receivers |
|
Use Scenario: Converting analog servo position error signals during head positioning in HDD actuator control loops. IC Role / Device Role / Timing Role: Low-latency, deterministic ADC providing feedback for closed-loop motor control with tight jitter tolerance. Use Value: Automatic power-down reduces average power consumption during idle periods; 200 ns track-and-hold acquisition ensures accurate capture of fast transient errors. |
Use Scenario: Digitizing downconverted RF signals in GSM/EDGE receiver chains where size and power are constrained. IC Role / Device Role / Timing Role: Compact, single-channel ADC interfaced directly to baseband processor via parallel bus, minimizing interface complexity. Use Value: TSSOP-20 package enables high-density layout; 3 V operation aligns with mobile SoC supply rails and extends battery life. |
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 |
|---|---|---|---|
| AD7825BRUZ | 4-channel variant with identical conversion speed, reference, and timing; adds A0/A1 address inputs and VIN2–VIN4 pins. | Requires multiplexer control logic and additional analog routing; suited for multi-sensor monitoring where channel count justifies added complexity. | Select AD7825BRUZ only if ≥2 analog inputs are needed; AD7822BRUZ avoids unused pins and simplifies 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 and driver. | Lacks parallel bus and integrated reference; better for low-pin-count, low-power systems where serial interface suffices. | Choose ADS7822U for space-constrained designs needing minimal footprint; AD7822BRUZ preferred for microprocessor-native parallel interfacing. |
Compared with AD7825BRUZ, AD7822BRUZ eliminates channel selection overhead and reduces PCB routing density; compared with ADS7822U, it provides faster parallel data transfer and eliminates external reference dependency-making AD7822BRUZ optimal for microprocessor-based systems prioritizing simplicity and deterministic timing.
Availability
AD7822BRUZ is available at Aetrix Electronics and suitable for data acquisition systems, DSP front ends, and disk drive read channels requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7822BRUZ 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 AD7822BRUZ belongs to the AD782x family of high-speed, low-power sampling ADCs designed specifically for real-time data acquisition in embedded instrumentation, communications infrastructure, and industrial control systems.
FAQ
What is the maximum sampling rate supported by the AD7822BRUZ?
The AD7822BRUZ supports a maximum throughput of 2 MSPS, enabled by its 420 ns maximum conversion time. This rate is achievable across the full industrial temperature range (−40°C to +85°C) under specified supply conditions (3 V ±10% or 5 V ±10%). The EOC pulse and parallel interface timing ensure reliable data capture at this rate without bus contention or setup/hold violations.
Does the AD7822BRUZ require an external reference voltage?
No, the AD7822BRUZ 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. External reference is optional and used only when higher accuracy or stability is required; the internal reference eliminates BOM cost and board space in most applications.
How does the automatic power-down feature work on the AD7822BRUZ?
The AD7822BRUZ samples the logic level on the CONVST pin at the end of each conversion (when EOC goes high). If CONVST is low at that instant, the device enters power-down mode, reducing supply current to 5 µA max. This occurs without external control logic, making it ideal for burst-mode acquisition where idle periods dominate.
What is the function of the VMID pin on the AD7822BRUZ?
The VMID pin sets the center point of the analog input voltage range. With VDD = 3 V, default VMID = 1.0 V yields a 0–2 V p-p input span; with VDD = 5 V, default VMID = 1.25 V yields 0–2.5 V p-p. Connecting VMID to an external voltage shifts the entire span linearly-enabling compatibility with single-supply op amps and compensation for system offsets.
Can the AD7822BRUZ interface directly with a microcontroller without glue logic?
Yes-the AD7822BRUZ features a flexible parallel interface compatible with standard 8051, PIC, and ADSP families. Using only address decoding logic, it maps directly into microprocessor memory space. The EOC pulse allows standalone operation (e.g., triggering an ISR), and RD/CS handshaking ensures clean bus arbitration without additional latches or timing controllers.
AD7822BRUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7822BRUZ FAQ
1.How can I place an order for AD7822BRUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7822BRUZ 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 AD7822BRUZ reliable?
The price and inventory of AD7822BRUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7822BRUZ is usually 5 days.
3.What payment methods are accepted for AD7822BRUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7822BRUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7822BRUZ?
AD7822BRUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7822BRUZ 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 AD7822BRUZ?
For technical support, including AD7822BRUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7822BRUZ requirements.
6.How does Aetrix verify that AD7822BRUZ is sourced from the original manufacturer or authorized distributors?
All AD7822BRUZ 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 AD7822BRUZ meets industry standards.
7.What is the process for return or replacement of AD7822BRUZ?
All AD7822BRUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7822BRUZ, 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 AD7822BRUZ part is unused and in its original packaging.
Return procedure for AD7822BRUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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