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Analog Devices Inc. AD7822BRUZ-REEL7
- Part No.:
- AD7822BRUZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7822BRUZ-REEL7.pdf
- Description:
- IC ADC 8BIT PIPELINED 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,826
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Product details
Overview
AD7822BRUZ-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%, features automatic power-down after conversion, and is used in DSP front ends and mobile communication subsampling applications.
For engineers reviewing the AD7822BRUZ-REEL7 datasheet, AD7822BRUZ-REEL7 pinout, AD7822BRUZ-REEL7 application, or AD7822BRUZ-REEL7 equivalent, key selection criteria include conversion speed, input span adjustability via VMID, track-and-hold acquisition time (200 ns), SNR at 30 kHz (48 dB min), and compatibility with microprocessor/DSP parallel buses using EOC and RD/CS control.
Technical Context
The AD7822BRUZ-REEL7 implements an 8-bit half-flash ADC architecture with two-stage flash conversion: a coarse 4-bit flash stage followed by a fine 4-bit flash stage, 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 uses a single CONVST pin to initiate conversion and enable automatic power-down - logic low sampled at EOC high triggers shutdown. Unlike AD7825/AD7829, it lacks A0/A1/A2 address inputs and has no dedicated PD pin; power-down is exclusively controlled via CONVST state sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes for precise digitization of analog signals in real-time systems. |
| Conversion Time | 420 ns max - enables 2 MSPS sustained throughput, maximizing DSP processing time per sample. |
| Input Span | 0 V to 2.5 V p-p @ 5 V supply or 0 V to 2 V p-p @ 3 V supply - auto-detected by internal VDD comparator without external configuration. |
| SNR @ 30 kHz | 48 dB min - ensures usable dynamic range for baseband and IF sampling in communications receivers. |
| On-Chip Reference | 2.5 V ±50 mV - eliminates need for external reference in cost-sensitive designs; buffered output available at VREF IN/OUT pin. |
| Power Consumption | 12 mA max @ 5 V normal operation; 5 µA max in power-down - supports battery-powered or thermally constrained embedded systems. |
| Track-and-Hold Acquisition | 200 ns max - defines minimum delay required after channel selection or input step before valid conversion start. |
Pinout & Package
AD7822BRUZ-REEL7 is housed in a 20-lead TSSOP (Thin Shrink Small Outline Package), 4.4 mm × 6.5 mm body, 0.65 mm pitch, RoHS-compliant, tape-and-reel format (REEL7). Pin 1 marked with dot; exposed pad not electrically connected.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DB2) | Data Output Bit 2 | LSB-aligned parallel data bus output; driven low/high only when CS and RD are both asserted. |
| 2 (DB1) | Data Output Bit 1 | Part of 8-bit unidirectional data path; high-impedance when RD/CS inactive - enables shared bus operation. |
| 3 (DB0) | Data Output Bit 0 | Provides LSB of conversion result; timing-critical - data valid t9 = 10 ns after RD low (3 V) or 20 ns (5 V). |
| 4 (CONVST) | Convert Start / Power-Down Control | Falling edge initiates conversion and places T/H in hold mode; state sampled at EOC high to enter power-down - no separate PD pin. |
| 5 (CS) | Chip Select | Enables parallel port drivers; must be low with RD to activate DB0–DB7 - essential for multi-device bus arbitration. |
| 6 (RD) | Read Strobe | Active-low signal that latches conversion result onto data bus; synchronizes with EOC for interrupt-driven read sequences. |
| 7 (DGND) | Digital Ground | Reference for all digital I/O; must be tied to AGND at single point near device to minimize ground bounce and noise coupling. |
| 8 (EOC) | End-of-Conversion Flag | Open-drain output (pull-up required); falling edge signals completion - used to trigger MCU ISR or gate array latch. |
| 9 (PD) | Power-Down Input | Not present on AD7822 - pin 9 is NC (No Connect) per Figure 3; power-down is solely CONVST-gated. |
| 10 (NC) | No Connect | Unbonded die pad; must remain floating - no routing or grounding permitted. |
| 11 (VIN1) | Analog Input Channel 1 | Single-ended input only; accepts 0–2.5 V (5 V supply) or 0–2 V (3 V supply); input leakage ≤±1 µA. |
| 12 (VMID) | Input Span Center Reference | Sets midpoint voltage of analog input range; default = 1.25 V (5 V) or 1.0 V (3 V); adjustable from AGND to VDD. |
| 13 (VREF IN/OUT) | Reference Input/Output | Supplies or sinks reference current; connects to internal 2.5 V bandgap; decoupling to AGND with 0.1 µF recommended. |
| 14 (VDD) | Positive Supply | Accepts 2.7–3.3 V or 4.5–5.5 V; PSR = ±1 LSB over ±10% variation - stable operation across wide supply tolerance. |
| 15 (AGND) | Analog Ground | Reference for T/H, comparator, reference circuit, and multiplexer; star-ground connection critical for DC accuracy. |
| 16 (DB7) | Data Output Bit 7 | MSB of conversion result; timing-matched to DB0–DB6 - all bits valid simultaneously after t9 delay. |
| 17 (DB6) | Data Output Bit 6 | Part of synchronous 8-bit parallel interface; requires setup/hold timing compliance per Table 2 (t11/t12). |
| 18 (DB5) | Data Output Bit 5 | Driven during active RD/CS window only; bus relinquish time t10 = 5 ns (3 V) or 20 ns (5 V) after RD high. |
| 19 (DB4) | Data Output Bit 4 | Supports standalone operation via EOC-triggered RD strobe - no microcontroller address decoding needed. |
| 20 (DB3) | Data Output Bit 3 | Completes 8-bit word; bit ordering matches straight binary coding - 0x00 = VMID − span/2, 0xFF = VMID + span/2 − 1 LSB. |
Key Features
| Feature | Design Value |
|---|---|
| 420 ns conversion time | Enables 2 MSPS real-time sampling - critical for undersampling RF signals up to 10 MHz without aliasing filters. |
| VMID-adjustable input span | Centers 2 V or 2.5 V input range anywhere between AGND and VDD - reduces op amp headroom requirements in single-supply front ends. |
| Automatic CONVST-gated power-down | Reduces average current to µA level between conversions - extends battery life in portable test equipment and sensor nodes. |
| On-chip 2.5 V reference (±2%) | Eliminates external reference IC and associated layout area/cost - maintains ±0.75 LSB INL and DNL over temperature. |
| Flexible parallel interface with EOC | Allows direct connection to 8051, PIC, or ADSP-21xx without glue logic - EOC falling edge serves as ready signal for interrupt-driven reads. |
Applications
| Communications Subsampling | DSP Front-End Acquisition |
|---|---|
|
Use Scenario: Digitizing IF signals at 45 MHz in GSM/EDGE base station receivers using undersampling technique. IC Role / Device Role / Timing Role: Single-channel ADC capturing aliased spectrum; 10 MHz FPBW and 420 ns conversion ensure fidelity of downconverted bands. Use Value: Enables elimination of analog anti-aliasing filters and reduces system BOM cost while maintaining 48 dB SNR at 30 kHz baseband. |
Use Scenario: Real-time waveform capture in motor control DSPs for current/voltage feedback loop analysis. IC Role / Device Role / Timing Role: High-speed data acquisition engine interfacing directly to ADSP-21xx parallel port via EOC and RD handshake. Use Value: 2 MSPS throughput provides >10× oversampling for 100 kHz control loops, improving resolution and noise immunity. |
| Disk Drive Read Channel | Portable Test Instrumentation |
|
Use Scenario: Reading analog servo position signals from voice coil actuators in HDD head positioning systems. IC Role / Device Role / Timing Role: Low-latency ADC converting position error signals with minimal propagation delay to close servo loop faster. Use Value: 420 ns conversion + 200 ns T/H acquisition allows sub-microsecond loop response - improves track-following accuracy. |
Use Scenario: Handheld oscilloscope module acquiring transient waveforms in field service tools. IC Role / Device Role / Timing Role: Standalone ADC operating without microcontroller - EOC triggers RD pulse to latch data into external FIFO. Use Value: Automatic power-down between samples cuts average supply current to <100 µA - extends Li-ion battery runtime to >8 hours. |
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 version in same 20-lead TSSOP; adds A0/A1 address pins; retains 420 ns conversion and 2.5 V reference. | Supports multiplexed multi-sensor acquisition; requires external address generation logic not needed for AD7822BRUZ-REEL7. | Select AD7825BRUZ only if 4-input scanning is required - pinout differs (A0/A1 replace DB2/DB1), requiring PCB redesign. |
| ADS8320UB | 10-bit, 2.7 V–5.5 V, SPI interface; 1.25 MSPS; no on-chip reference; external REF required; 16-pin SOIC package. | Higher resolution but serial interface increases MCU overhead; lacks EOC and parallel bus - unsuitable for interrupt-driven real-time systems. | Choose ADS8320UB only when 10-bit resolution outweighs latency penalty and board space savings from serial interface justify redesign. |
Compared with AD7825BRUZ and ADS8320UB, AD7822BRUZ-REEL7 offers optimal balance of speed, simplicity, and integration for single-channel, microprocessor-tied applications - its parallel interface, EOC signaling, and self-contained reference eliminate support components and reduce firmware complexity.
Availability
AD7822BRUZ-REEL7 is available at Aetrix Electronics and suitable for data acquisition systems, disk drive servo control, and mobile communications subsampling applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7822BRUZ-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 AD7822BRUZ-REEL7 belongs to the AD7822/AD7825/AD7829 family of high-speed, low-power, microprocessor-compatible ADCs designed specifically for real-time DSP front ends and subsampling applications in communications and storage systems.
FAQ
What is the maximum sampling rate supported by the AD7822BRUZ-REEL7?
The AD7822BRUZ-REEL7 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) and under both 3 V ±10% and 5 V ±10% supply conditions, as verified in the Timing Characteristics table (t1 parameter) of the Rev. C datasheet.
Does the AD7822BRUZ-REEL7 require an external reference voltage?
No, the AD7822BRUZ-REEL7 includes an on-chip 2.5 V reference with ±2% initial accuracy and 50 ppm/°C temperature coefficient. The VREF IN/OUT pin can be left unconnected when using the internal reference, or decoupled to AGND with a 0.1 µF capacitor. External reference is optional and only needed for tighter tolerance applications.
How does power-down work on the AD7822BRUZ-REEL7?
Power-down on the AD7822BRUZ-REEL7 is automatically triggered: at the end of conversion, the logic state of the CONVST pin is sampled when EOC goes high. If CONVST is low at that instant, the device enters power-down mode, reducing IDD to 5 µA max. There is no separate PD pin - this behavior is intrinsic to the AD7822 design and confirmed in the General Description and Operating Modes sections.
What is the function of the VMID pin on the AD7822BRUZ-REEL7?
The VMID pin sets the center voltage of the AD7822BRUZ-REEL7's analog input range. With no connection, it defaults to 1.0 V (3 V supply) or 1.25 V (5 V supply), yielding input spans of 0–2 V or 0–2.5 V. Connecting an external voltage between AGND and VDD shifts the full-scale range symmetrically around that value - enabling single-supply op amp interfacing without level-shifting circuitry.
Is the AD7822BRUZ-REEL7 compatible with 3 V microcontrollers?
Yes, the AD7822BRUZ-REEL7 is fully compatible with 3 V microcontrollers: its digital inputs accept VINH ≥ 2.0 V and VINL ≤ 0.4 V at VDD = 3 V ±10%, and outputs drive VOH ≥ 2.4 V and VOL ≤ 0.2 V under same conditions. Timing parameters (e.g., t9 = 20 ns data access) are specified for 3 V operation, ensuring reliable parallel bus handshaking with 3 V logic families.
AD7822BRUZ-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:
- 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-REEL7 FAQ
1.How can I place an order for AD7822BRUZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7822BRUZ-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 AD7822BRUZ-REEL7 reliable?
The price and inventory of AD7822BRUZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7822BRUZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7822BRUZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7822BRUZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7822BRUZ-REEL7?
AD7822BRUZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7822BRUZ-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 AD7822BRUZ-REEL7?
For technical support, including AD7822BRUZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7822BRUZ-REEL7 requirements.
6.How does Aetrix verify that AD7822BRUZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7822BRUZ-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 AD7822BRUZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7822BRUZ-REEL7?
All AD7822BRUZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7822BRUZ-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 AD7822BRUZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7822BRUZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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