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Analog Devices Inc. AD7829BR-REEL
- Part No.:
- AD7829BR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7829BR-REEL.pdf
- Description:
- IC ADC 8BIT 8CH 2MSPS 28-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:11,677
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Product details
Overview
AD7829BR-REEL 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 subsampling systems.
For engineers reviewing the AD7829BR-REEL datasheet, AD7829BR-REEL pinout, AD7829BR-REEL application, or AD7829BR-REEL equivalent, key selection criteria include channel count (8 single-ended), conversion speed (2 MSPS), input span flexibility (0–2 V or 0–2.5 V), EOC-driven standalone operation, and VMID-adjustable input offset for single-supply signal conditioning.
Technical Context
The AD7829BR-REEL implements a half-flash ADC architecture with two-stage conversion: a 4-bit coarse flash followed by a 4-bit fine flash, completing within 420 ns max. Its track-and-hold acquires input signals in ≤200 ns and supports full-power bandwidth up to 10 MHz.
Channel selection is performed via three address inputs (A0–A2), independent of data bus activity. The CONVST pin serves dual function-initiating conversion on its falling edge and enabling automatic power-down when sampled low at EOC assertion-eliminating need for external control logic in burst-mode sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - guarantees monotonicity and no missing codes over full temperature range. |
| Max Throughput | 2 MSPS - enables real-time digitization of signals up to 10 MHz (full-power bandwidth) without aliasing in subsampling applications. |
| Conversion Time | 420 ns max - defines minimum inter-conversion interval; allows maximum DSP processing time per sample. |
| Analog Input Span | 0 V to 2.5 V (VDD = 5 V) or 0 V to 2 V (VDD = 3 V) - auto-detected by internal VDD comparator; centered via VMID pin for single-supply op amp interfacing. |
| On-Chip Reference | 2.5 V ±50 mV - eliminates external reference component; usable as VREF IN/OUT with 2% initial tolerance and 50 ppm/°C drift. |
| Power Consumption | 12 mA typical at 2 MSPS (VDD = 5 V); drops to 5 μA in power-down - supports low-duty-cycle sampling to reduce average system power. |
| INL / DNL | ±0.75 LSB max each - ensures accurate amplitude fidelity in measurement and control loops requiring consistent code spacing. |
Pinout & Package
The AD7829BR-REEL is housed in a 28-lead SOIC package (width: 0.3 inch), RoHS-compliant, tape-and-reel format (REEL suffix). Pin count and layout match standard 28-pin SOIC footprint with 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN8 | Analog Input Channels | Eight single-ended inputs; voltage range automatically scaled to 0–2.5 V (5 V supply) or 0–2 V (3 V supply); VMID sets common-mode center point. |
| A0, A1, A2 | Channel Address Inputs | 3-bit binary select for active VINx channel; latched on falling edge of RD; no register write required. |
| CONVST | Convert Start / Power-Down Control | Falling edge initiates conversion and places T/H in hold mode; state sampled at EOC high to enter auto power-down. |
| EOC | End-of-Conversion Output | Active-low pulse (≥70 ns wide) signals completion; used to trigger microcontroller interrupt or latch data without polling. |
| RD & CS | Parallel Interface Enable | Both must be low to enable DB0–DB7 output drivers; supports shared data bus with other peripherals. |
| DB0–DB7 | 8-Bit Data Outputs | High-impedance until RD/CS asserted; straight-binary coding; compatible with 5 V and 3 V logic families. |
| VREF IN/OUT | Reference I/O | Provides access to internal 2.5 V reference; accepts external reference; decoupling to AGND improves noise immunity. |
| VMID | Input Span Center Voltage | Sets midpoint of analog input range (e.g., 1.25 V default at 5 V); enables offset adjustment for rail-to-rail input signal conditioning. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel multiplexed input with hardware address decoding | Eliminates need for software-controlled channel registers or external MUX control logic. |
| Automatic power-down triggered by CONVST level at EOC | Reduces average current to <5 μA between conversions without external timing circuitry or GPIO intervention. |
| VMID-adjustable input common-mode voltage | Allows direct interface with single-supply op amps operating from same VDD, avoiding level-shifting components. |
| 420 ns conversion + 200 ns acquisition time | Supports continuous sampling at 2 MSPS while maintaining SNR >48 dB up to 30 kHz input frequency. |
| On-chip 2.5 V reference with 50 ppm/°C drift | Enables compact, low-BOM-count designs for portable and battery-powered instrumentation where reference stability is critical. |
Applications
| Disk Drive Read Channel | Mobile Communication Subsampling |
|---|---|
Use Scenario: Digitizing servo position error signals and PRML readback waveforms in HDD head-positioning systems. IC Role / Device Role / Timing Role: High-speed 8-bit ADC capturing analog feedback at 2 MSPS with precise timing alignment to spindle motor phase. Use Value: 420 ns conversion time enables tight servo loop closure; channel isolation >70 dB prevents crosstalk between position and velocity sensing paths. | Use Scenario: Intermediate-frequency (IF) sampling in GSM/EDGE baseband receivers using undersampling techniques. IC Role / Device Role / Timing Role: 8-channel ADC performing bandpass sampling of 70–100 MHz IF signals downconverted to 10–20 MHz range. Use Value: 10 MHz full-power bandwidth and 48 dB SNR at 30 kHz allow clean capture of modulated carriers; VMID adjustment accommodates variable IF gain stages. |
| DSP-Based Motor Control | Industrial Data Acquisition Module |
Use Scenario: Simultaneous sampling of current, voltage, and temperature sensors in closed-loop PMSM drive inverters. IC Role / Device Role / Timing Role: 8-channel ADC synchronized to PWM carrier edges via CONVST triggering for deterministic current reconstruction. Use Value: Automatic power-down between samples reduces thermal load in space-constrained motor control enclosures; 8-bit resolution suffices for fast overcurrent detection and field-oriented control. | Use Scenario: Modular sensor node aggregating thermocouple, strain gauge, and vibration transducer outputs in predictive maintenance systems. IC Role / Device Role / Timing Role: Standalone ADC operating via EOC-triggered RD strobes, interfaced to ARM Cortex-M MCU over parallel bus. Use Value: Flexible 3 V/5 V supply and on-chip reference simplify multi-sensor power domain design; channel-to-channel isolation ensures cross-talk-free simultaneous acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, multi-channel, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7825BRZ | 4-channel version; identical 420 ns conversion time, same SOIC-24 package; lacks A2 and VIN5–VIN8 pins. | Lower channel density suits cost-sensitive 4-sensor systems; reduced pin count simplifies PCB routing. | Select AD7825BRZ when only four analog inputs are needed and board space is constrained. |
| MAX1138EEE+ | 8-channel, 2 MSPS, but uses SPI interface instead of parallel; requires external reference; no VMID pin. | Serial interface reduces MCU pin count but increases conversion latency due to protocol overhead. | Choose MAX1138EEE+ for designs prioritizing minimal digital I/O usage over deterministic timing and zero-latency data availability. |
Compared with AD7825BRZ, AD7829BR-REEL provides double the channel count in same SOIC footprint; compared with MAX1138EEE+, it offers immediate parallel data availability and integrated reference-critical for time-critical DSP front ends where bus latency must be minimized.
Availability
AD7829BR-REEL is available at Aetrix Electronics and suitable for disk drive servo control, mobile IF subsampling, and industrial data acquisition requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7829BR-REEL 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 AD782x family-including AD7829BR-REEL-is designed for high-speed, low-latency data acquisition in real-time systems where deterministic timing, minimal external components, and flexible supply operation are essential.
FAQ
What supply voltages does the AD7829BR-REEL support?
The AD7829BR-REEL operates from a single supply of either 3 V ±10% (2.7 V to 3.3 V) or 5 V ±10% (4.5 V to 5.5 V). Internal circuitry auto-detects the supply level to configure input span (0–2 V or 0–2.5 V) and logic thresholds accordingly. No external configuration is required-AD7829BR-REEL adapts seamlessly across both voltage domains.
How does the automatic power-down feature work on the AD7829BR-REEL?
At the end of each conversion, the AD7829BR-REEL samples the logic level on the CONVST pin. If CONVST is low when EOC goes high, the device enters power-down mode, reducing supply current to ≤5 μA. This occurs without software intervention or additional control signals-AD7829BR-REEL manages its own sleep/wake cycle based solely on CONVST state.
Can the AD7829BR-REEL operate without an external reference?
Yes-the AD7829BR-REEL includes an internal 2.5 V reference with ±50 mV initial accuracy and 50 ppm/°C temperature coefficient. The VREF IN/OUT pin can be left unconnected or decoupled to AGND with a 0.1 µF capacitor. Using the internal reference eliminates external components and simplifies layout-AD7829BR-REEL is fully functional out-of-the-box.
What is the role of the VMID pin on the AD7829BR-REEL?
The VMID pin sets the center voltage of the analog input span. With VMID unconnected, AD7829BR-REEL defaults to 1.25 V (5 V supply) or 1.0 V (3 V supply), yielding input ranges of 0–2.5 V or 0–2 V. Connecting an external voltage to VMID shifts the entire span-enabling bipolar or offset-adjusted single-supply interfacing without external op amp level shifting.
Is the AD7829BR-REEL pin-compatible with other devices in the AD782x family?
No-AD7829BR-REEL uses a 28-pin SOIC package with dedicated pins for A2, VIN5–VIN8, and no PD pin, distinguishing it from the 24-pin AD7825 and 20-pin AD7822. While functional architecture and interface timing are consistent across the family, physical pinout differs; AD7829BR-REEL requires its specific footprint and cannot be substituted without PCB revision.
AD7829BR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 2M
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- Parallel
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7829BR-REEL FAQ
1.How can I place an order for AD7829BR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7829BR-REEL 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 AD7829BR-REEL reliable?
The price and inventory of AD7829BR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7829BR-REEL is usually 5 days.
3.What payment methods are accepted for AD7829BR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7829BR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7829BR-REEL?
AD7829BR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7829BR-REEL 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 AD7829BR-REEL?
For technical support, including AD7829BR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7829BR-REEL requirements.
6.How does Aetrix verify that AD7829BR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7829BR-REEL 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 AD7829BR-REEL meets industry standards.
7.What is the process for return or replacement of AD7829BR-REEL?
All AD7829BR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7829BR-REEL, 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 AD7829BR-REEL part is unused and in its original packaging.
Return procedure for AD7829BR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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