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Analog Devices Inc. AD7829BRZ
- Part No.:
- AD7829BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7829BRZ.pdf
- Description:
- IC ADC 8BIT PIPELINED 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:110
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Product details
Overview
AD7829BRZ from Analog Devices is an 8-bit, 2 MSPS, 8-channel parallel-output analog-to-digital converter with on-chip 2.5 V reference, track-and-hold amplifier, and automatic power-down. It operates from single 3 V ±10% or 5 V ±10% supply and delivers 420 ns conversion time for high-speed data acquisition in DSP front ends and mobile communication subsampling systems.
For engineers reviewing the AD7829BRZ datasheet, AD7829BRZ pinout, AD7829BRZ application, or AD7829BRZ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and layout implications.
Technical Context
The AD7829BRZ uses a half-flash ADC architecture: a 4-bit flash stage generates MSBs, followed by a second flash stage for LSBs-achieving full 8-bit resolution in ≤420 ns. Its track-and-hold acquires input in ≤200 ns and supports full-scale signals up to 10 MHz, enabling direct RF subsampling without external anti-alias filtering in select applications.
Channel selection is performed via three address inputs (A0–A2), independent of data bus activity; conversion is initiated by falling edge on CONVST, and end-of-conversion is signaled by EOC pulse. Power-down is automatically triggered when CONVST is low at EOC assertion-no separate control logic required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit straight binary output-supports 256 discrete levels with no missing codes guaranteed across temperature. |
| Max Throughput | 2 MSPS-enables real-time sampling of baseband or IF signals up to 10 MHz without undersampling artifacts. |
| Conversion Time | 420 ns max-defines minimum inter-conversion interval; allows ≥2.38 µs dead time for microprocessor read cycle. |
| Input Span | 0 V to 2.5 V p-p at 5 V supply or 0 V to 2 V p-p at 3 V supply-configurable center point via VMID pin for single-supply op amp interfacing. |
| SNR @ 30 kHz | 48 dB min-translates to effective resolution of ~7.7 bits; sufficient for voice-band and medium-fidelity sensor digitization. |
| INL / DNL | ±0.75 LSB max each-ensures monotonicity and <0.3% full-scale linearity error over industrial temperature range. |
| Power Dissipation | 36 mW max at 3 V (normal operation)-enables battery-powered portable instrumentation with thermal budget headroom. |
Pinout & Package
AD7829BRZ is housed in a 28-lead SOIC package (width: 0.300", body: 17.9 mm × 7.5 mm) with standard JEDEC MS-012AC footprint and 1.27 mm pitch. Pin 1 marked by beveled corner; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN8 | Analog Input Channels | Eight single-ended inputs; default span = 0 V to 2.5 V (5 V supply) or 0 V to 2 V (3 V supply); centered via VMID. |
| A0, A1, A2 | Channel Address Inputs | Binary-select active analog channel prior to CONVST falling edge; no register write required. |
| CONVST | Convert Start / Power-Down Control | Falling edge initiates conversion; sampled at EOC rising edge-if low, device enters auto power-down mode. |
| EOC | End-of-Conversion Output | Active-low pulse (≥70 ns wide) signals valid data ready; usable as interrupt source for µP/DSP. |
| RD & CS | Parallel Interface Enable | Both must be low to drive DB0–DB7; RD controls data bus release timing (t9 = 10/20 ns access time). |
| DB0–DB7 | 8-Bit Data Outputs | High-impedance until RD/CS asserted; CMOS-compatible levels (VOH ≥2.4 V @ 3 V, VOL ≤0.2 V @ 3 V). |
| VREF IN/OUT | Reference I/O | Supplies or sinks 2.5 V ±2% internal reference; can accept external 2.5 V source for improved stability. |
| VMID | Input Span Center Reference | Sets common-mode voltage for all VIN channels; default = 1.25 V (5 V) or 1.0 V (3 V) if left open. |
| VDD, AGND, DGND | Supply & Grounds | Single 3 V or 5 V supply; analog/digital grounds tied at package for noise isolation-no split-plane routing needed. |
Key Features
| Feature | Design Value |
|---|---|
| 420 ns conversion time | Enables >2 MSPS throughput while leaving ≥2.38 µs per sample for µP processing or memory write cycles. |
| On-chip 2.5 V reference (±2%) | Eliminates external reference IC and decoupling components-reduces BOM count and board area by ≥3 parts. |
| Automatic power-down on CONVST low | Reduces average current from 12 mA to 5 µA between conversions-ideal for burst-mode sensing applications. |
| Track-and-hold FPBW = 10 MHz | Supports accurate digitization of full-scale sine waves up to 10 MHz-validates use in IF sampling architectures. |
| Channel selection via A0–A2 pins | Removes need for SPI/I²C configuration registers-simplifies firmware and enables deterministic channel switching. |
Applications
| Disk Drive Read Channel | Mobile Baseband Subsampling |
|---|---|
|
Use Scenario: Digitizing analog servo position signals and PRML readback waveforms in HDD head-positioning circuits. IC Role / Device Role / Timing Role: High-speed ADC capturing 10–20 MHz analog feedback loops with minimal latency and deterministic timing. Use Value: 420 ns conversion + 200 ns track-and-hold acquisition ensures phase-coherent sampling of closed-loop control signals without jitter-induced tracking errors. |
Use Scenario: Direct IF sampling of 45–90 MHz GSM/EDGE intermediate frequencies down to baseband in compact handset designs. IC Role / Device Role / Timing Role: 8-bit subsampling ADC operating at 2 MSPS with 10 MHz FPBW to capture aliased baseband spectra. Use Value: On-chip 2.5 V reference and VMID offset adjustment enable single-supply 3 V operation with rail-to-rail input handling-reducing external signal conditioning. |
| DSP Front-End Acquisition | Industrial Data Logger |
|
Use Scenario: Real-time waveform capture for FFT-based spectral analysis in motor control and power quality analyzers. IC Role / Device Role / Timing Role: Parallel-output ADC feeding data directly into DSP DMA engine with EOC-triggered interrupt synchronization. Use Value: EOC pulse width ≥70 ns and t9 access time ≤20 ns guarantee reliable latch timing for 8051/PIC/ADSP-21xx interfaces without wait states. |
Use Scenario: Multi-channel voltage monitoring of battery packs, sensor arrays, and PLC analog I/O modules. IC Role / Device Role / Timing Role: 8-channel scan ADC with automatic power-down between samples to extend battery life in portable field instruments. Use Value: 5 µA power-down current and flexible 3 V/5 V supply allow operation from coin cells or 5 V USB rails without LDO overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, multi-channel, parallel-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7825BRZ | 4-channel version, same 2 MSPS speed, identical pinout except A2 and VIN5–VIN8 omitted; PD pin present. | Limited to 4 inputs; requires PCB redesign if expanding beyond 4 sensors; retains same timing and interface compatibility. | Select AD7825BRZ only when system requires ≤4 analog inputs and space/power constraints favor smaller package. |
| MAX1186ECM+ | 8-channel, 2 MSPS, but uses serial SPI interface (not parallel); 3 V only; no on-chip reference-requires external 2.048 V ref. | Requires FPGA/microcontroller SPI peripheral and additional reference IC; eliminates 8-bit data bus but increases firmware complexity. | Choose MAX1186ECM+ only when board layout prioritizes pin count reduction over deterministic parallel read timing. |
Compared with AD7829BRZ, AD7825BRZ offers identical performance in a reduced channel count with no change to timing or power architecture, while MAX1186ECM+ trades parallel simplicity for serial interface flexibility and higher component count.
Availability
AD7829BRZ is available at Aetrix Electronics and suitable for disk drive read channels, mobile baseband subsampling, and DSP front-end acquisition requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and communications OEMs.
Supply support for AD7829BRZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with R&D and manufacturing facilities worldwide.
The AD7822/AD7825/AD7829 family was designed specifically for high-speed, low-latency data acquisition in resource-constrained embedded systems-emphasizing minimal external components, automatic power management, and seamless µP/DSP integration.
FAQ
What is the maximum input frequency the AD7829BRZ can accurately digitize?
The AD7829BRZ track-and-hold amplifier has a full-power bandwidth (FPBW) of 10 MHz, meaning it can accurately capture full-scale sine wave inputs up to that frequency without slew-induced distortion. This makes AD7829BRZ suitable for subsampling applications where aliasing is intentionally used to down-convert IF signals-provided input anti-alias filtering meets Nyquist criteria for the desired band.
Does the AD7829BRZ require an external reference voltage?
No, the AD7829BRZ 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 for basic operation, or decoupled with a 0.1 µF capacitor to AGND. An external 2.5 V reference may be applied to improve stability in precision applications-but AD7829BRZ does not require it for functional operation.
How does automatic power-down work on the AD7829BRZ?
At the end of each conversion, the AD7829BRZ samples the logic level on the CONVST pin. If CONVST is low when the EOC signal goes high, the device enters power-down mode, reducing supply current from 12 mA to 5 µA. This feature is enabled by default and requires no additional control lines-making AD7829BRZ ideal for burst-mode or event-triggered acquisition systems.
Can the AD7829BRZ operate from a 3.3 V supply?
Yes-the AD7829BRZ supports 3 V ±10%, i.e., 2.7 V to 3.3 V nominal operation. At 3.3 V, input span defaults to 0 V to 2 V p-p, and logic thresholds adjust accordingly (VINH ≥2.0 V, VINL ≤0.4 V). All timing parameters-including 420 ns conversion time and 200 ns acquisition-remain fully specified across this range, as confirmed in the Rev. C datasheet Table 1 and Table 2.
What is the purpose of the VMID pin on the AD7829BRZ?
The VMID pin sets the center voltage of the AD7829BRZ's analog input span. When left unconnected, it defaults to 1.0 V (3 V supply) or 1.25 V (5 V supply), establishing a 0 V to 2 V or 0 V to 2.5 V input range. Connecting an external voltage to VMID shifts the entire input window-e.g., applying 2.0 V centers the range at 2.0 V, allowing ±1.0 V differential input on a single 3 V rail-critical for interfacing with single-supply op amps.
AD7829BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 2M
- Number of Inputs:
- 8
- 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:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7829BRZ FAQ
1.How can I place an order for AD7829BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7829BRZ 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 AD7829BRZ reliable?
The price and inventory of AD7829BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7829BRZ is usually 5 days.
3.What payment methods are accepted for AD7829BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7829BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7829BRZ?
AD7829BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7829BRZ 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 AD7829BRZ?
For technical support, including AD7829BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7829BRZ requirements.
6.How does Aetrix verify that AD7829BRZ is sourced from the original manufacturer or authorized distributors?
All AD7829BRZ 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 AD7829BRZ meets industry standards.
7.What is the process for return or replacement of AD7829BRZ?
All AD7829BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7829BRZ, 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 AD7829BRZ part is unused and in its original packaging.
Return procedure for AD7829BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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