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Analog Devices Inc. AD7822BNZ
- Part No.:
- AD7822BNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7822BNZ.pdf
- Description:
- IC ADC 8BIT PIPELINED 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,760
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Product details
Overview
AD7822BNZ from Analog Devices is a high-speed, single-channel, 8-bit analog-to-digital converter (ADC) with 2 MSPS throughput, 420 ns conversion time, on-chip 2.5 V reference, and parallel interface - designed for DSP front ends and data acquisition systems operating from 3 V or 5 V supplies.
For engineers reviewing the AD7822BNZ datasheet, AD7822BNZ pinout, AD7822BNZ application, or AD7822BNZ equivalent, this page delivers verified specifications, functional context, real-world use cases, and validated alternative options - all grounded in the Rev. C datasheet and official Analog Devices documentation.
Technical Context
The AD7822BNZ implements an 8-bit half-flash architecture with a track-and-hold amplifier and integrated 2.5 V reference. It supports automatic power-down triggered by CONVST logic level sampling at EOC assertion, enabling ultra-low quiescent current (5 µA) between conversions.
Its parallel interface uses active-low CS and RD with EOC pulse output for microprocessor/DSP synchronization. Channel selection is fixed (single-input), eliminating address bus requirements - unlike the AD7825/AD7829 variants - and simplifying standalone operation in compact signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - guarantees monotonic transfer function and no missing codes over full temperature range. |
| Max Throughput | 2 MSPS - enables real-time sampling of signals up to 10 MHz full-power bandwidth (FPBW) for subsampling applications. |
| Conversion Time | 420 ns max - defines minimum inter-conversion interval and maximizes DSP processing window in time-critical systems. |
| 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 via internal VDD comparator; centered by VMID pin. |
| INL / DNL | ±0.75 LSB max each - ensures accurate amplitude fidelity in measurement and control loops without calibration. |
| Power Consumption | 12 mA max @ 2 MSPS (3 V or 5 V); drops to 5 µA in power-down - supports battery-powered or thermally constrained designs. |
| SNR | 48 dB min @ fIN = 30 kHz - sufficient for medium-fidelity instrumentation and communication baseband digitization. |
Pinout & Package
The AD7822BNZ is packaged in a 20-lead, 0.3" wide plastic dual in-line package (PDIP), with pins arranged for direct PCB mounting and standard through-hole assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST | Convert Start Input | Falling edge initiates conversion and places T/H in hold mode; sampled at EOC to trigger automatic power-down. |
| EOC | End-of-Conversion Output | Active-low pulse signals completion; used to interrupt MCU or latch data without external timing logic. |
| RD | Read Strobe Input | Activates output drivers when low (with CS), enabling parallel data readout onto DB0–DB7 bus. |
| CS | Chip Select Input | Enables parallel port only when low - essential for shared-bus systems with multiple peripherals. |
| DB0–DB7 | Digital Output Bus | Tri-state outputs deliver 8-bit straight-binary code; high-impedance when RD/CS inactive for bus isolation. |
| VIN1 | Analog Input Channel | Single-ended input with 15 pF capacitance and ±1 µA leakage - compatible with op-amp drivers and passive anti-alias filters. |
| VREF IN/OUT | Reference I/O | Provides access to internal 2.5 V ±50 mV reference or accepts external reference; decoupling recommended. |
| VMID | Input Span Center | Adjusts analog input range center point from AGND to VDD - enables offset compensation in single-supply front ends. |
| AGND / DGND | Analog & Digital Grounds | Separate ground pins minimize digital switching noise coupling into sensitive analog path; tied together at single point. |
| VDD | Supply Voltage | Accepts 2.7–3.3 V or 4.5–5.5 V - wide tolerance simplifies power rail design and supports mixed-voltage system integration. |
Key Features
| Feature | Design Value |
|---|---|
| 420 ns conversion time | Enables 2 MSPS sampling without pipeline latency - critical for real-time feedback control and burst-mode acquisition. |
| On-chip 2.5 V reference | Eliminates need for external precision reference; ±50 mV error and 50 ppm/°C drift support stable DC accuracy. |
| Automatic power-down | Reduces average current to µA-level between conversions - extends battery life in portable test equipment and sensors. |
| VMID-adjustable input span | Allows input range centering anywhere from AGND to VDD - simplifies interfacing with unipolar or bipolar sensor outputs. |
| Track-and-hold FPBW = 10 MHz | Preserves signal integrity for full-scale inputs up to 10 MHz - suitable for IF subsampling in wireless receivers. |
Applications
| High-Speed Data Acquisition | DSP Front-End Interface |
|---|---|
|
Use Scenario: Real-time voltage monitoring in industrial PLC analog input modules with 10 µs update cycles. IC Role / Device Role / Timing Role: ADC core converting conditioned sensor signals at 2 MSPS with minimal latency and deterministic EOC signaling. Use Value: 420 ns conversion + EOC pulse enables precise microcontroller synchronization and eliminates polling overhead. |
Use Scenario: Digitizing baseband I/Q signals in software-defined radio transceivers before FFT processing. IC Role / Device Role / Timing Role: Single-channel ADC capturing narrowband RF samples with 10 MHz FPBW and 48 dB SNR. Use Value: On-chip 2.5 V reference and VMID offset support direct connection to op-amp gain stages without level-shifting. |
| Disk Drive Read Channel | Portable Test Instrumentation |
|
Use Scenario: Reading servo position error signals in HDD head-positioning circuits requiring fast, repeatable sampling. IC Role / Device Role / Timing Role: High-throughput ADC acquiring analog servo waveforms with sub-microsecond timing resolution. Use Value: Automatic power-down between bursts reduces average power to <100 µW - critical for thermal management in sealed drives. |
Use Scenario: Handheld oscilloscope front end digitizing transient waveforms with battery-operated, low-noise signal chain. IC Role / Device Role / Timing Role: Low-power ADC operating from 3 V supply with 12 mA active / 5 µA standby current. Use Value: Dual supply compatibility (3 V/5 V) and PDIP package simplify prototyping and field-replaceable module design. |
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 |
|---|---|---|---|
| AD7825BNZ | 4-channel variant with A0/A1 address inputs; identical conversion speed, reference, and power specs. | Requires multiplexer control logic and address decoding - unsuitable for single-input simplicity but better channel density. | Select AD7825BNZ only if multi-channel sampling is required; AD7822BNZ avoids address bus overhead and layout complexity. |
| MAX1186BCPP+ | Pin-compatible 8-bit, 2 MSPS ADC with internal reference; different timing (tCONV = 450 ns), higher THD (−50 dB). | Lacks VMID offset adjustment and automatic power-down - requires external reference and explicit sleep control. | Choose MAX1186BCPP+ only if legacy MAXIM footprint compatibility is mandatory; AD7822BNZ offers superior offset flexibility and lower idle power. |
Compared with AD7825BNZ, AD7822BNZ eliminates channel addressing complexity and reduces BOM count in single-signal systems; compared with MAX1186BCPP+, it delivers tighter DC accuracy (±0.75 LSB INL vs ±1.5 LSB), integrated VMID offset, and autonomous power management - making it optimal for precision, low-overhead acquisition.
Availability
AD7822BNZ is available at Aetrix Electronics and suitable for high-speed data acquisition systems, DSP front ends, and disk drive servo control requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7822BNZ 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 AD7822BNZ belongs to the AD782x family of high-speed, microprocessor-compatible ADCs - engineered for real-time signal capture in instrumentation, communications, and industrial control where speed, accuracy, and low power coexist.
FAQ
What is the maximum sampling rate supported by the AD7822BNZ?
The AD7822BNZ supports a maximum throughput of 2 MSPS, with a guaranteed maximum conversion time of 420 ns. This rate is achievable across the full industrial temperature range (−40°C to +85°C) and under both 3 V and 5 V supply conditions, as confirmed in the Rev. C datasheet Table 1 and Timing Characteristics section.
Does the AD7822BNZ require an external reference voltage?
No, the AD7822BNZ 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 - no external reference is needed unless higher precision is required.
How does the automatic power-down feature work on the AD7822BNZ?
The AD7822BNZ samples the logic level on the CONVST pin at the moment EOC goes high. If CONVST is low, the device enters power-down mode, reducing supply current to 5 µA. This occurs automatically after every conversion unless CONVST is held high - enabling energy-efficient burst-mode operation without software intervention.
What is the purpose of the VMID pin on the AD7822BNZ?
The VMID pin sets the center point of the AD7822BNZ's analog input range (0 V to 2 V @ 3 V or 0 V to 2.5 V @ 5 V). When left unconnected, it defaults to 1.0 V or 1.25 V respectively. Connecting an external voltage allows full-span centering anywhere from AGND to VDD - essential for interfacing with single-supply op amps and compensating system offsets.
Is the AD7822BNZ pin-compatible with other devices in the AD782x family?
No - the AD7822BNZ (20-pin PDIP) has a distinct pinout from the AD7825BNZ (24-pin) and AD7829 (28-pin), with no shared pin mapping for address lines (A0/A1/A2), additional analog inputs, or PD. Its simplified single-channel layout omits multiplexer control pins, making it electrically and physically non-interchangeable with those variants.
AD7822BNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7822BNZ FAQ
1.How can I place an order for AD7822BNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7822BNZ 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 AD7822BNZ reliable?
The price and inventory of AD7822BNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7822BNZ is usually 5 days.
3.What payment methods are accepted for AD7822BNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7822BNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7822BNZ?
AD7822BNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7822BNZ 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 AD7822BNZ?
For technical support, including AD7822BNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7822BNZ requirements.
6.How does Aetrix verify that AD7822BNZ is sourced from the original manufacturer or authorized distributors?
All AD7822BNZ 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 AD7822BNZ meets industry standards.
7.What is the process for return or replacement of AD7822BNZ?
All AD7822BNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7822BNZ, 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 AD7822BNZ part is unused and in its original packaging.
Return procedure for AD7822BNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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