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Analog Devices Inc. AD7829BRUZ-1REEL7
- Part No.:
- AD7829BRUZ-1REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7829BRUZ-1REEL7.pdf
- Description:
- IC ADC 8BIT PIPELINED 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,866
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Product details
Overview
AD7829BRUZ-1REEL7 from Analog Devices is a high-speed, 8-channel, 8-bit parallel-output analog-to-digital converter (ADC) with 420 ns conversion time, 2 MSPS throughput, on-chip 2.5 V reference, and track-and-hold amplifier. It operates from single 3 V ±10% or 5 V ±10% supply and supports data acquisition in DSP front ends and mobile communication subsampling systems.
For engineers reviewing the AD7829BRUZ-1REEL7 datasheet, AD7829BRUZ-1REEL7 pinout, AD7829BRUZ-1REEL7 application, or AD7829BRUZ-1REEL7 equivalent, key selection criteria include conversion speed, channel count, input span adjustability via VMID, SNR at 10 MHz input, and automatic power-down behavior triggered by CONVST logic level at EOC assertion.
Technical Context
The AD7829BRUZ-1REEL7 implements a half-flash ADC architecture with two-stage conversion: a 4-bit coarse flash followed by a 4-bit fine flash to achieve full 8-bit resolution. Its track-and-hold acquires input within 200 ns and supports full-scale signals up to 10 MHz FPBW.
Channel selection is performed via A2–A0 address inputs prior to RD assertion; conversion is initiated by falling edge of CONVST, and end-of-conversion is signaled by EOC pulse. Power-down is automatically enabled when CONVST is low at EOC high, reducing IDD to 5 μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes with no missing codes guaranteed across temperature. |
| Conversion Time | 420 ns max - enables 2 MSPS sustained throughput for real-time signal capture in DSP systems. |
| Input Channels | 8 single-ended - selectable via A2–A0 without register writes, simplifying microcontroller interface. |
| Supply Range | 3 V ±10% or 5 V ±10% - dual-voltage compatibility supports both low-power and legacy 5 V designs. |
| On-Chip Reference | 2.5 V ±50 mV - eliminates external reference need; usable as VREF IN/OUT with 2% tolerance. |
| SNR @ 30 kHz | 48 dB min - sufficient for medium-fidelity acquisition in disk drive servo loops and telecom front ends. |
| Channel Isolation | −70 dB typ - ensures minimal crosstalk between adjacent VIN channels during multiplexed sampling. |
| Power-Down Current | 5 μA max - reduces idle power by >99% vs. normal operation (12 mA), critical for battery-powered subsampling. |
Pinout & Package
AD7829BRUZ-1REEL7 is housed in a 28-lead TSSOP (thin shrink small outline package), RoHS-compliant, with 0.65 mm lead pitch and exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN8 | Analog Input Channels | Single-ended inputs supporting 2 V (3 V supply) or 2.5 V (5 V supply) spans; centered via VMID voltage. |
| CONVST | Convert Start / Power-Down Control | Falling edge initiates conversion; logic level sampled at EOC high determines automatic power-down entry. |
| EOC | End-of-Conversion Output | Active-low pulse signals completion; used to trigger microcontroller ISR or latch data without handshake logic. |
| RD & CS | Parallel Interface Enable | Both low enable 8-bit data bus (DB0–DB7); RD gates output drivers, CS isolates bus during shared-access operation. |
| A0–A2 | Multiplexer Address Inputs | 3-bit binary select one of eight VIN channels; must be stable before RD falls to avoid channel misread. |
| VREF IN/OUT | Reference I/O | Provides or accepts 2.5 V ±2%; internal reference active when unconnected or decoupled with 0.1 µF to AGND. |
| VMID | Input Span Centering | Sets common-mode midpoint; default = 1.0 V (3 V) or 1.25 V (5 V); external bias enables bipolar signal support. |
| AGND / DGND | Analog & Digital Grounds | Separate pins minimize digital noise coupling into analog path; recommended to tie together at single point near device. |
Key Features
| Feature | Design Value |
|---|---|
| 420 ns conversion time | Maximizes available DSP processing time per sample in real-time control loops and burst-mode acquisition. |
| VMID-adjustable input span | Enables offset compensation and bipolar signal handling without external op-amp level-shifting circuitry. |
| 10 MHz full-power bandwidth | Supports undersampling of IF signals in mobile comms and spectrum analysis applications up to Nyquist limit. |
| Automatic power-down mode | Reduces average power by >99% between conversions-critical for portable instrumentation with intermittent sampling. |
| Flexible parallel interface | Requires only address decoding logic; compatible with 8051, PIC16Cxx, and ADSP-21xx families without glue logic. |
| Channel-to-channel isolation −70 dB | Prevents signal bleed between multiplexed sensor inputs in multi-channel industrial monitoring systems. |
Applications
| Disk Drive Servo Control | Mobile Communication Subsampling |
|---|---|
|
Use Scenario: Real-time position error detection in HDD voice coil motor actuator feedback loop. IC Role / Device Role / Timing Role: 8-channel ADC digitizes head-position sensor outputs (e.g., MR/GMR elements) at 2 MSPS for closed-loop correction. Use Value: 420 ns conversion enables tight servo timing margins; −70 dB channel isolation prevents cross-talk between adjacent servo wedges. |
Use Scenario: Intermediate frequency (IF) sampling in GSM/EDGE baseband receivers using bandpass undersampling. IC Role / Device Role / Timing Role: Digitizes 70–100 MHz IF signals folded into baseband via 2 MSPS sampling, leveraging 10 MHz FPBW and SNR stability. Use Value: On-chip 2.5 V reference and VMID adjust eliminate external precision components; automatic power-down cuts idle current in sleep modes. |
| DSP Front-End Data Acquisition | Industrial Multi-Sensor Monitoring |
|
Use Scenario: Simultaneous analog capture from multiple transducers (vibration, temp, pressure) feeding TI C6000 or Analog Devices SHARC processors. IC Role / Device Role / Timing Role: Parallel 8-bit interface directly maps to DSP external memory bus; EOC pulse triggers DMA transfer without CPU overhead. Use Value: 8 single-ended channels reduce external MUX count; 3 V/5 V supply flexibility eases integration into mixed-voltage embedded platforms. |
Use Scenario: Condition monitoring of rotating machinery using synchronized voltage/current/temperature measurements across 8 sensors. IC Role / Device Role / Timing Role: Converts isolated analog outputs from signal-conditioning amps into time-aligned digital streams for FFT-based fault detection. Use Value: VMID pin centers all input spans to match sensor common-mode range; channel isolation prevents ground-loop interference in distributed sensor arrays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, multi-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7828BRUZ | 8-channel, 8-bit, but 1.25 MSPS max; no VMID pin; requires external reference; 500 ns conversion time. | Lacks input span adjustment and automatic power-down; suited for lower-speed, cost-sensitive industrial logging. | Select AD7828BRUZ only if 2 MSPS and VMID functionality are unnecessary and external reference is acceptable. |
| MAX1138ETJ+ | 8-channel, 8-bit, 1 MSPS; SPI interface; internal reference; no track-and-hold; 1.5 µs conversion time. | Serial interface reduces pin count but increases software overhead; unsuitable for real-time parallel-bus DSP interfacing. | Choose MAX1138ETJ+ for space-constrained designs where serial interface and smaller TQFN package outweigh speed loss. |
Compared with AD7829BRUZ-1REEL7, AD7828BRUZ trades speed and flexibility for lower cost and simpler BOM, while MAX1138ETJ+ sacrifices parallel throughput and analog performance for compactness and integrated SPI-neither offers identical 2 MSPS + VMID + automatic power-down capability.
Availability
AD7829BRUZ-1REEL7 is available at Aetrix Electronics and suitable for disk drive servo control, mobile communication subsampling, and DSP front-end data acquisition requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7829BRUZ-1REEL7 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 AD7829 family was designed specifically for high-speed, multi-channel data acquisition in resource-constrained embedded systems requiring low-latency parallel interfacing and flexible analog input configuration.
FAQ
What is the maximum input frequency the AD7829BRUZ-1REEL7 can accurately digitize?
The AD7829BRUZ-1REEL7 has a full-power bandwidth (FPBW) of 10 MHz, meaning it maintains specified SNR and distortion performance for full-scale sine wave inputs up to 10 MHz. This makes it suitable for subsampling applications where IF signals are folded into baseband. Performance degrades above this frequency due to track-and-hold limitations-not ADC core resolution.
How does the VMID pin affect the input voltage range of the AD7829BRUZ-1REEL7?
When unconnected, VMID defaults to 1.0 V (3 V supply) or 1.25 V (5 V supply), setting input range to 0–2 V or 0–2.5 V respectively. Applying an external voltage to VMID shifts the input span symmetrically: for 3 V supply, range becomes VMID ±1.0 V; for 5 V, VMID ±1.25 V. This enables bipolar signal capture and system offset cancellation without external op-amps.
Does the AD7829BRUZ-1REEL7 require an external reference, or can it operate with its internal reference?
The AD7829BRUZ-1REEL7 includes a factory-trimmed 2.5 V ±50 mV on-chip reference accessible at the VREF IN/OUT pin. It operates fully self-contained with this reference-no external component needed. The pin may be left unconnected or decoupled with 0.1 µF to AGND. An external 2.5 V reference may be applied for tighter tolerance, but the internal reference suffices for most applications.
What happens to the AD7829BRUZ-1REEL7 power state after a conversion completes?
At the end of conversion, the AD7829BRUZ-1REEL7 samples the logic level on the CONVST pin when EOC goes high. If CONVST is low, the device enters automatic power-down mode, reducing supply current from 12 mA to 5 μA. If CONVST is high, it remains in active mode. This feature enables precise power gating without external control logic.
Can the AD7829BRUZ-1REEL7 interface directly with an 8051 microcontroller without additional logic?
Yes-the AD7829BRUZ-1REEL7's parallel interface is explicitly designed for direct connection to 8051 derivatives. CS and RD map to PSEN and WR; A0–A2 connect to address lines; DB0–DB7 tie to the data bus. The EOC pulse can trigger INT0, enabling interrupt-driven data capture. Application note AN-285 confirms timing compatibility with standard 8051 bus cycles.
AD7829BRUZ-1REEL7 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:
- 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7829BRUZ-1REEL7 FAQ
1.How can I place an order for AD7829BRUZ-1REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7829BRUZ-1REEL7 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 AD7829BRUZ-1REEL7 reliable?
The price and inventory of AD7829BRUZ-1REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7829BRUZ-1REEL7 is usually 5 days.
3.What payment methods are accepted for AD7829BRUZ-1REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7829BRUZ-1REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7829BRUZ-1REEL7?
AD7829BRUZ-1REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7829BRUZ-1REEL7 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 AD7829BRUZ-1REEL7?
For technical support, including AD7829BRUZ-1REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7829BRUZ-1REEL7 requirements.
6.How does Aetrix verify that AD7829BRUZ-1REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7829BRUZ-1REEL7 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 AD7829BRUZ-1REEL7 meets industry standards.
7.What is the process for return or replacement of AD7829BRUZ-1REEL7?
All AD7829BRUZ-1REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7829BRUZ-1REEL7, 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 AD7829BRUZ-1REEL7 part is unused and in its original packaging.
Return procedure for AD7829BRUZ-1REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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