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Analog Devices Inc. AD7829BRU-REEL7
- Part No.:
- AD7829BRU-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7829BRU-REEL7.pdf
- Description:
- IC ADC 8BIT PIPELINED 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,637
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Product details
Overview
AD7829BRU-REEL7 from Analog Devices is an 8-bit, 2 MSPS, 8-channel parallel-output analog-to-digital converter with on-chip 2.5 V reference, 420 ns conversion time, and single-supply operation at 3 V ±10% or 5 V ±10%. It integrates track-and-hold, half-flash ADC architecture, and automatic power-down triggered by CONVST logic level at EOC assertion - used in high-speed data acquisition front ends for DSP systems and disk drive servo control.
For engineers reviewing the AD7829BRU-REEL7 datasheet, AD7829BRU-REEL7 pinout, AD7829BRU-REEL7 application, or AD7829BRU-REEL7 equivalent, key selection criteria include channel count (8 single-ended), conversion speed (2 MSPS), supply flexibility (3 V/5 V), input span adjustability via VMID, and parallel interface timing compatibility with 8051, PIC, and ADSP-21xx processors.
Technical Context
The AD7829BRU-REEL7 implements a two-stage 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 within 200 ns and supports full-power bandwidth up to 10 MHz.
Channel selection is performed externally via A0–A2 address lines synchronized with RD; no internal register write is required. The CONVST pin serves dual function - initiating conversion on its falling edge and enabling automatic power-down when sampled low at EOC high - eliminating need for separate control logic in low-duty-cycle sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - guarantees monotonicity and no missing codes over full temperature range (−40°C to +85°C) |
| Max Sampling Rate | 2 MSPS - enables real-time capture of signals up to 10 MHz (Nyquist-limited) without aliasing in subsampling applications |
| Conversion Time | 420 ns max - defines minimum inter-conversion interval; allows ≥2.38 µs dead time for processor readout at full rate |
| Analog Input Channels | 8 single-ended - selectable via A0/A1/A2 pins; no software configuration needed for channel switching |
| Supply Voltage Range | 3 V ±10% or 5 V ±10% - supports mixed-voltage system integration without level-shifting circuitry |
| On-Chip Reference | 2.5 V ±50 mV - eliminates external reference component; usable as VREF IN/OUT with 100 µA max input current |
| Power Consumption | 12 mA max at 2 MSPS (3 V/5 V) - drops to 5 µA in power-down mode, reducing idle dissipation by >99% |
| INL / DNL | ±0.75 LSB max each - ensures accurate amplitude fidelity in closed-loop control and measurement applications |
Pinout & Package
AD7829BRU-REEL7 is housed in a 28-lead TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, moisture sensitivity level 3, and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN8 | Analog input channels | Eight independent single-ended inputs; input span automatically set to 2.5 V (5 V supply) or 2.0 V (3 V supply); centered via VMID voltage |
| CONVST | Convert start / power-down control | Falling edge initiates conversion and places T/H in hold mode; logic level sampled at EOC high determines auto power-down activation |
| EOC | End-of-conversion indicator | Active-low pulse (≥70 ns wide) signals completion; used to trigger microcontroller interrupt or latch data into external register |
| RD | Read strobe | Active-low signal enabling output drivers; data valid t9 = 10 ns (3 V) / 20 ns (5 V) after RD low; bus relinquished t10 = 5–20 ns after RD high |
| CS | Chip select | Active-low enable for parallel port; must be low with RD to drive DB0–DB7; allows shared data bus operation |
| A0–A2 | Channel address inputs | 3-bit binary code selects one of eight analog inputs prior to RD assertion; no internal latching required |
| DB0–DB7 | Parallel data outputs | 8-bit straight-binary output; high-impedance when RD/CS inactive; compatible with TTL/CMOS logic levels |
| VREF IN/OUT | Reference I/O | Supplies or sinks reference voltage; internal 2.5 V reference available here; external reference can override on-chip source |
| VMID | Input span centering | Bias voltage setting midpoint of analog input range (AGND to VDD); default = 1.25 V (5 V) or 1.0 V (3 V) when unconnected |
| VDD | Positive supply | Single supply input supporting 3 V ±10% or 5 V ±10%; powers analog and digital sections simultaneously |
| AGND / DGND | Analog/digital ground | Separate ground pins minimize noise coupling; recommended to tie together at single point near device |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel multiplexed input with hardware-selectable addressing | Eliminates need for external MUX control logic or firmware overhead; A0–A2 directly route VIN1–VIN8 to ADC core |
| Automatic power-down on conversion completion | Reduces average current to µA-level between conversions - critical for battery-powered data loggers and portable test equipment |
| Adjustable input span via VMID pin | Enables offset compensation for sensor front ends and single-supply op amp interfaces without external level-shifting components |
| 420 ns conversion time with 200 ns track-and-hold acquisition | Supports undersampling of RF IF signals up to 10 MHz while maintaining SNR ≥48 dB at 30 kHz input |
| On-chip 2.5 V reference with ±2% tolerance | Removes requirement for precision external reference IC, simplifying BOM and layout for cost-sensitive industrial DAQ modules |
| Flexible parallel interface with EOC pulse | Allows standalone operation without microprocessor handshake - EOC falling edge directly clocks external latch or triggers ISR |
Applications
| Disk Drive Servo Control | DSP-Based Data Acquisition |
|---|---|
Use Scenario: Real-time position error signal (PES) sampling from read/write head preamplifier outputs during track-following operations. IC Role / Device Role / Timing Role: 8-channel ADC digitizing multiple servo burst patterns (A, B, C, D) and gain-controlled analog feedback paths at 2 MSPS. Use Value: 420 ns conversion time enables tight servo loop closure; channel-to-channel isolation >70 dB prevents crosstalk-induced tracking jitter. |
Use Scenario: Front-end digitization of conditioned sensor signals (vibration, temperature, pressure) in programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: High-throughput ADC interfacing directly to ADSP-21xx SHARC processor via parallel bus; EOC-driven DMA request. Use Value: Automatic power-down reduces average power to <1 mW at 100 kSPS, extending thermal margin in sealed industrial enclosures. |
| Mobile Communication Subsampling | Automated Test Equipment (ATE) Channel Expansion |
Use Scenario: Intermediate frequency (IF) sampling in GSM/EDGE baseband receivers where 10 MHz bandwidth signals are undersampled at 2 MSPS. IC Role / Device Role / Timing Role: 8-bit ADC capturing subsampled IF bursts with SNR ≥48 dB and THD ≤−55 dB up to 10 MHz input. Use Value: 10 MHz full-power bandwidth and low intermodulation distortion (−65 dB typ) preserve adjacent-channel interference metrics. |
Use Scenario: Adding parallel analog input capability to legacy ATE mainframes using 8051-based controller cards. IC Role / Device Role / Timing Role: Pin-compatible ADC drop-in replacement for aging AD7822/AD7825 designs; leverages existing RD/CS/CONVST timing. Use Value: Identical parallel interface timing (t9, t10, t11) and 3 V/5 V supply support ensure zero firmware or PCB changes during upgrade. |
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 |
|---|---|---|---|
| AD7825BRUZ-REEL7 | 4-channel version; identical 420 ns conversion time, same 3 V/5 V supply, but lacks A2 and VIN5–VIN8 pins | Suitable only where ≤4 analog inputs are required; smaller TSSOP-24 package reduces board area | Select when channel count reduction justifies simplified routing and lower pin-count interface |
| ADS820U | 8-bit, 2 MSPS, but uses serial SPI interface instead of parallel; no on-chip reference; requires external 2.5 V reference | Reduces PCB trace count and connector size; incompatible with existing parallel-bus microcontrollers without interface translation | Prefer for space-constrained designs where serial interface and external reference are acceptable trade-offs |
Compared with AD7829BRU-REEL7, AD7825BRUZ-REEL7 offers identical performance per channel but halves input count and package size, while ADS820U trades parallel simplicity for serial footprint reduction and external reference dependency - neither is pin-compatible, but both serve overlapping high-speed 8-bit acquisition roles.
Availability
AD7829BRU-REEL7 is available at Aetrix Electronics and suitable for disk drive servo systems, DSP-based data acquisition modules, mobile communication subsampling receivers, and automated test equipment requiring stable component supply across extended production lifecycles.
Supply support for AD7829BRU-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, with design centers and manufacturing facilities worldwide.
The AD7822/AD7825/AD7829 family was engineered for high-speed, low-latency analog front ends in real-time embedded systems - emphasizing minimal conversion latency, flexible supply operation, and direct microprocessor/DSP interfacing without glue logic.
FAQ
What is the maximum input frequency supported by the AD7829BRU-REEL7 while maintaining specified SNR?
The AD7829BRU-REEL7 maintains ≥48 dB SNR for input frequencies up to 10 MHz, as verified under fIN = 30 kHz, fSAMPLE = 2 MHz conditions per datasheet Table 1. Its track-and-hold amplifier's full-power bandwidth is rated to 10 MHz, making it suitable for undersampling applications where high-frequency IF signals are captured below Nyquist rate.
Does the AD7829BRU-REEL7 require an external reference, or can it operate using its internal reference?
The AD7829BRU-REEL7 can operate using its internal 2.5 V reference, accessible at the VREF IN/OUT pin. When using the internal reference, this pin may be left unconnected or decoupled to AGND with a 0.1 µF capacitor. External reference is optional and only needed if tighter than ±2% tolerance or different voltage is required.
How does automatic power-down work on the AD7829BRU-REEL7, and what is its impact on power consumption?
At the end of conversion, the AD7829BRU-REEL7 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 from 12 mA (active) to 5 µA. This feature cuts average power significantly in burst-mode sampling, such as in servo control loops with intermittent acquisition windows.
What are the voltage ranges for analog inputs on the AD7829BRU-REEL7 when operating at 3 V versus 5 V supply?
At VDD = 3 V ±10%, the AD7829BRU-REEL7 supports 0 V to 2.0 V p-p input range centered at VMID = 1.0 V (default). At VDD = 5 V ±10%, it supports 0 V to 2.5 V p-p centered at VMID = 1.25 V (default). The VMID pin allows recentering the span anywhere between AGND and VDD to accommodate bipolar or offset-adjusted sensor outputs.
Is the AD7829BRU-REEL7 pin-compatible with earlier AD7822 or AD7825 variants?
No, the AD7829BRU-REEL7 is not pin-compatible with AD7822 or AD7825. It uses a 28-lead TSSOP package with dedicated A2, VIN5–VIN8, and no PD pin - unlike the 20-lead (AD7822) or 24-lead (AD7825) packages. Pin functions differ across families; migration requires PCB redesign and firmware adaptation for 8-channel addressing.
AD7829BRU-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7829BRU-REEL7 FAQ
1.How can I place an order for AD7829BRU-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7829BRU-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 AD7829BRU-REEL7 reliable?
The price and inventory of AD7829BRU-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7829BRU-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7829BRU-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7829BRU-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7829BRU-REEL7?
AD7829BRU-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7829BRU-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 AD7829BRU-REEL7?
For technical support, including AD7829BRU-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7829BRU-REEL7 requirements.
6.How does Aetrix verify that AD7829BRU-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7829BRU-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 AD7829BRU-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7829BRU-REEL7?
All AD7829BRU-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7829BRU-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 AD7829BRU-REEL7 part is unused and in its original packaging.
Return procedure for AD7829BRU-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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