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Analog Devices Inc. AD7829BRZ-REEL
- Part No.:
- AD7829BRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7829BRZ-REEL.pdf
- Description:
- IC ADC 8BIT PIPELINED 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,009
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Product details
Overview
AD7829BRZ-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 mobile communication subsampling systems.
For engineers reviewing the AD7829BRZ-REEL datasheet, AD7829BRZ-REEL pinout, AD7829BRZ-REEL application, or AD7829BRZ-REEL equivalent, key selection criteria include channel count (8 single-ended), conversion speed (2 MSPS), input span adjustability via VMID, SNR ≥48 dB at 30 kHz, and compatibility with microprocessor/DSP parallel interfaces using EOC-driven timing.
Technical Context
The AD7829BRZ-REEL implements a half-flash ADC architecture: a 4-bit flash stage provides MSBs, followed by a second flash stage for LSBs, achieving full 8-bit resolution in ≤420 ns. Its track-and-hold acquires input signals within 200 ns and supports full-power bandwidth up to 10 MHz.
Channel selection is performed externally via A0–A2 address lines, independent of data bus activity. Conversion initiation and power-state control share the CONVST pin: falling edge triggers sampling/hold, and logic level sampled at EOC high determines automatic power-down-eliminating need for separate control sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit straight binary output; guarantees no missing codes over full temperature range. |
| Max Throughput | 2 MSPS - enables real-time sampling of baseband signals up to 10 MHz (Nyquist-limited) in subsampling applications. |
| Conversion Time | 420 ns max - defines minimum inter-conversion interval and sets upper bound on system latency. |
| 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. |
| SNR | 48 dB min @ fIN = 30 kHz - sufficient for 8-bit ENOB in medium-bandwidth signal chains. |
| On-Chip Reference | 2.5 V ±50 mV - eliminates external reference component while maintaining ±0.75 LSB INL. |
| Power Consumption | 12 mA max @ 5 V normal operation; 5 μA max in power-down - supports burst-mode low-power acquisition. |
Pinout & Package
AD7829BRZ-REEL is housed in a 28-lead SOIC package (body width 0.300", JEDEC MS-012AA). Pin layout supports 8-channel analog multiplexing, parallel 8-bit data output, and asynchronous control signaling with minimal external logic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN8 | Analog Input Channels | Eight single-ended inputs; voltage range centered by VMID; default AGND–2.5 V (5 V) or AGND–2 V (3 V). |
| A0, A1, A2 | Channel Address Inputs | 3-bit binary select for active analog input channel prior to CONVST falling edge. |
| CONVST | Convert Start / Power Control | Falling edge initiates conversion and hold; logic level sampled at EOC high enables automatic power-down. |
| EOC | End-of-Conversion Output | Active-low pulse (min 70 ns, max 110 ns) signals data validity and can trigger microcontroller interrupt. |
| RD, CS | Parallel Interface Enable | Both low enable DB0–DB7 drivers; RD latches data onto bus; CS isolates ADC when sharing data bus. |
| DB0–DB7 | Digital Output Bus | Tri-state outputs deliver 8-bit result; high-impedance when RD/CS inactive - supports shared bus architectures. |
| VREF IN/OUT | Reference I/O | Supplies or sinks 2.5 V reference; internal source enabled by leaving unconnected or decoupling to AGND. |
| VMID | Input Span Center | Bias point for analog input range; sets midpoint between AGND and VDD - enables offset adjustment for single-supply op amps. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel single-ended MUX + T/H | Enables sequential sampling across eight sensors or signal paths without external multiplexer or sample-hold circuitry. |
| Auto power-down on CONVST low | Reduces average current to 5 μA between conversions - critical for battery-powered burst-acquisition systems. |
| VMID-adjustable input span | Allows input range centering anywhere from AGND to VDD - accommodates DC-coupled signals and simplifies front-end design. |
| 420 ns conversion + 200 ns acquisition | Supports >2 MSPS sustained throughput with <120 ns hold-to-track recovery - suitable for interleaved or multi-channel real-time capture. |
| On-chip 2.5 V reference (±2%) | Removes need for precision external reference; maintains ±0.75 LSB INL and ±1 LSB offset error over −40°C to +85°C. |
Applications
| Disk Drive Read Channel | Mobile Baseband Subsampling |
|---|---|
|
Use Scenario: Digitizing PRML (Partial Response Maximum Likelihood) analog waveforms from magnetic head preamplifiers during high-speed disk rotation. IC Role / Device Role / Timing Role: High-speed 8-bit ADC capturing equalized readback signals at 2 MSPS with precise timing alignment to servo bursts. Use Value: 10 MHz full-power bandwidth and 48 dB SNR preserve signal integrity for Viterbi decoding; automatic power-down reduces heat near sensitive analog front end. |
Use Scenario: Intermediate-frequency (IF) sampling in GSM/EDGE transceivers where 13 MHz IF is undersampled to baseband. IC Role / Device Role / Timing Role: 8-channel ADC performing time-interleaved or diversity sampling of multiple antenna paths at 2 MSPS per channel. Use Value: Channel-to-channel isolation >70 dB prevents crosstalk between diversity branches; VMID adjust enables DC offset compensation across RF paths. |
| DSP-Based Motor Control | Industrial Data Acquisition Module |
|
Use Scenario: Simultaneous sampling of phase currents, bus voltage, and rotor position feedback in servo drives with real-time current loop closure. IC Role / Device Role / Timing Role: Parallel-output ADC interfaced directly to ADSP-21xx DSP via EOC-triggered interrupt, minimizing software overhead. Use Value: 420 ns conversion time maximizes available DSP cycle budget for field-oriented control calculations; 8-bit resolution matches PWM resolution requirements. |
Use Scenario: Modular 8-channel sensor interface for vibration monitoring, temperature arrays, or pressure grids in factory automation PLCs. IC Role / Device Role / Timing Role: Standalone ADC operating without microcontroller - EOC pulses latch data into FPGA registers for timestamped buffering. Use Value: Flexible 3 V/5 V supply and wide industrial temperature range (−40°C to +85°C) ensure robustness in harsh environments; SOIC package supports automated assembly. |
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 in 24-lead SOIC; identical 420 ns conversion, same reference and interface logic. | Limited to 4 inputs; requires external MUX for >4 signals; lower pin count reduces PCB area. | Select when system requires only four analog channels and board space is constrained. |
| MAX1186EEE+ | 8-channel, 2 MSPS, but uses serial SPI interface; no on-chip reference; requires external 2.5 V ref. | Serial interface reduces trace count but increases CPU overhead; lacks VMID adjust and automatic power-down. | Prefer when board-level routing density is critical and microcontroller has SPI bandwidth to spare. |
Compared with AD7825BRZ and MAX1186EEE+, the AD7829BRZ-REEL uniquely combines 8-channel parallel output, on-chip 2.5 V reference, VMID-based input span control, and CONVST-gated auto power-down - making it optimal for compact, low-latency, self-contained acquisition nodes.
Availability
AD7829BRZ-REEL is available at Aetrix Electronics and suitable for disk drive read channels, mobile communication subsampling systems, DSP-based motor control, industrial data acquisition modules, and embedded test equipment requiring stable component supply and long-term production continuity.
Supply support for AD7829BRZ-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 AD7822/AD7825/AD7829 family was designed specifically for high-speed, low-latency data acquisition in resource-constrained embedded systems - emphasizing minimal external components, flexible supply operation, and direct microprocessor/DSP integration.
FAQ
What is the maximum sampling rate supported by the AD7829BRZ-REEL?
The AD7829BRZ-REEL supports a maximum throughput of 2 MSPS, corresponding to 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 ±10% and 5 V ±10% supply conditions, as verified in the Rev. C datasheet timing characteristics table.
Does the AD7829BRZ-REEL require an external reference voltage?
No, the AD7829BRZ-REEL includes an on-chip 2.5 V reference with ±2% initial accuracy and 50 ppm/°C temperature coefficient. The VREF IN/OUT pin may be left unconnected to use the internal reference, or decoupled to AGND with a 0.1 µF capacitor for improved noise immunity - no external reference is required for standard operation.
How does channel selection work on the AD7829BRZ-REEL?
Channel selection on the AD7829BRZ-REEL is performed using the three address inputs A0, A1, and A2, which must be stable before the falling edge of the CONVST signal. These pins directly select one of eight analog inputs (VIN1–VIN8) without requiring register writes or serial configuration - enabling simple, deterministic hardware-based multiplexing.
Can the AD7829BRZ-REEL operate from a 3.3 V supply?
Yes, the AD7829BRZ-REEL is fully specified for operation from 3 V ±10%, i.e., 2.7 V to 3.3 V. At this supply, the input voltage span is 0 V to 2 V p-p, logic thresholds adjust accordingly (VINH ≥2.0 V, VINL ≤0.4 V), and power consumption drops to 8 mA typical - all parameters remain guaranteed per the Rev. C datasheet specifications table.
What is the purpose of the VMID pin on the AD7829BRZ-REEL?
The VMID pin on the AD7829BRZ-REEL sets the centerpoint of the analog input voltage range. 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 span. Connecting an external voltage to VMID shifts this span linearly - enabling DC offset compensation and single-supply op amp interface optimization.
AD7829BRZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-REEL FAQ
1.How can I place an order for AD7829BRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7829BRZ-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 AD7829BRZ-REEL reliable?
The price and inventory of AD7829BRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7829BRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7829BRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7829BRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7829BRZ-REEL?
AD7829BRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7829BRZ-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 AD7829BRZ-REEL?
For technical support, including AD7829BRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7829BRZ-REEL requirements.
6.How does Aetrix verify that AD7829BRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7829BRZ-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 AD7829BRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7829BRZ-REEL?
All AD7829BRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7829BRZ-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 AD7829BRZ-REEL part is unused and in its original packaging.
Return procedure for AD7829BRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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