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Analog Devices Inc. AD7829BRW-1RL7
- Part No.:
- AD7829BRW-1RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7829BRW-1RL7.pdf
- Description:
- IC ADC 8BIT PIPELINED 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,469
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Product details
Overview
AD7829BRW-1RL7 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 AD7829BRW-1RL7 datasheet, AD7829BRW-1RL7 pinout, AD7829BRW-1RL7 application, or AD7829BRW-1RL7 equivalent, key selection criteria include its 8-channel single-ended input architecture, automatic power-down via CONVST, flexible VMID-based input span adjustment, and EOC-synchronized parallel interface for microprocessor/DSP interfacing.
Technical Context
The AD7829BRW-1RL7 implements a half-flash ADC architecture with coarse (4-bit) and fine (4-bit) conversion stages, achieving full 8-bit resolution in ≤420 ns. Its track-and-hold amplifier features 200 ns acquisition time and supports full-scale input signals up to 10 MHz FPBW.
Channel selection is performed externally via A2–A0 address lines; no internal register write is required. The CONVST pin serves dual functions-initiating conversion on its falling edge and enabling automatic power-down when sampled low at EOC assertion-eliminating need for external control logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit straight binary output; guarantees no missing codes over full temperature range. |
| Conversion Time | 420 ns maximum; enables 2 MSPS sustained throughput for real-time signal capture. |
| Input Channels | 8 single-ended analog inputs (VIN1–VIN8); channel selected by A2–A0 address lines. |
| Supply Voltage | 3 V ±10% or 5 V ±10%; internal VDD detector auto-configures input span (2 V or 2.5 V). |
| On-Chip Reference | 2.5 V ±2% (±50 mV), 50 ppm/°C TC; usable as reference source or sink via VREF IN/OUT pin. |
| Dynamic Performance | 48 dB SNR at 30 kHz input, −55 dB THD, −70 dB channel-to-channel isolation at 20 kHz. |
| Power Consumption | 12 mA max (36 mW @ 3 V) in normal operation; drops to 5 μA in automatic power-down mode. |
Pinout & Package
AD7829BRW-1RL7 is housed in a 28-lead wide-body SOIC (SOIC_W) package, RoHS-compliant and rated for industrial temperature range (−40°C to +85°C). Pin count and layout match standard 28-lead SOIC footprint with 0.6 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN8 | Analog Input Channels | Eight single-ended inputs; input span centered by VMID (default: AGND–2.0 V @ 3 V, AGND–2.5 V @ 5 V). |
| CONVST | Convert Start / Power-Down Control | Falling edge initiates conversion and places T/H in hold mode; sampled at EOC to enter power-down if low. |
| EOC | End-of-Conversion Output | Active-low pulse signals completion; used to trigger microcontroller ISR or latch data without external timing logic. |
| RD & CS | Parallel Interface Enable | Both must be low to enable DB0–DB7 outputs; RD gates data bus access, CS enables port during shared-bus operation. |
| A2–A0 | Channel Address Inputs | 3-bit binary address selects one of eight VIN channels prior to RD assertion; no internal register write needed. |
| DB0–DB7 | Parallel Data Outputs | 8-bit straight binary output bus; high-impedance when RD/CS inactive; compatible with 3 V and 5 V logic families. |
| VREF IN/OUT | Reference I/O | Provides or accepts 2.5 V ±2% reference; decoupling capacitor recommended when using internal reference. |
| VMID | Input Span Centering | Adjusts analog input range center point (e.g., VMID = 1.5 V yields ±0.5 V range @ 3 V); default = 1.0 V or 1.25 V. |
Key Features
| Feature | Design Value |
|---|---|
| 420 ns conversion time | Maximizes available DSP processing time per sample in real-time systems; supports 2 MSPS continuous sampling. |
| VMID-adjustable input span | Enables offset compensation and bipolar signal handling without external op-amp level-shifting circuitry. |
| 10 MHz full-power bandwidth (FPBW) | Supports undersampling of IF signals in communications receivers and spectrum analysis applications. |
| Automatic power-down on CONVST | Reduces average power to <5 μA between conversions; eliminates need for external power sequencing control. |
| Single-supply 3 V/5 V operation | Eliminates dual-rail supplies; internal VDD detector auto-selects input range and reference scaling. |
Applications
| High-Speed Data Acquisition | DSP Front-End Interface |
|---|---|
|
Use Scenario: Real-time waveform capture in test equipment and industrial monitoring systems requiring >1 MSPS sampling across multiple sensors. IC Role / Device Role / Timing Role: 8-channel ADC digitizes analog sensor outputs with minimal latency; EOC synchronizes data readout to host processor. Use Value: 420 ns conversion + parallel interface enables deterministic sub-microsecond sampling-to-readout timing without DMA overhead. |
Use Scenario: Digitizing analog feedback signals in motor control or audio processing systems interfaced to TI C2000 or ADSP-21xx DSPs. IC Role / Device Role / Timing Role: ADC acts as high-throughput analog front end; RD/CS/EOC signals map directly to DSP external memory interface timing. Use Value: No glue logic required-direct connection to DSP data/address bus simplifies PCB layout and reduces BOM count. |
| Disk Drive Read Channel | Mobile Communication Subsampling |
|
Use Scenario: Reading servo position signals and head preamplifier outputs in HDD controller ASICs where space and power are constrained. IC Role / Device Role / Timing Role: ADC converts analog servo error signals with high channel-to-channel isolation to prevent crosstalk between actuator and spindle loops. Use Value: −70 dB channel isolation ensures accurate position tracking even under high-frequency mechanical vibration. |
Use Scenario: Direct RF/IF sampling in GSM/EDGE baseband receivers operating at intermediate frequencies up to 10 MHz. IC Role / Device Role / Timing Role: ADC performs undersampling of bandpass signals; 10 MHz FPBW preserves signal integrity without external antialiasing filters. Use Value: Eliminates external SAW filters and op-amp buffers, reducing component count and board area in compact handheld designs. |
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 |
|---|---|---|---|
| AD7828BRZ | 8-channel, 8-bit, but 1.25 MSPS max; no on-chip reference; requires external 2.5 V ref. | Lacks automatic power-down and VMID span adjustment; suited for lower-throughput, fixed-range systems. | Select when cost sensitivity outweighs speed and flexibility; verify external reference stability meets SNR requirements. |
| MAX1186ECM+ | 8-channel, 8-bit, 2 MSPS, but uses SPI interface; no parallel bus; 2.5 V internal ref. | Requires serial interface logic and software driver; unsuitable for direct microprocessor bus mapping. | Choose only if system already uses SPI peripherals and board layout favors serial routing over 8-bit parallel traces. |
Compared with AD7829BRW-1RL7, AD7828BRZ trades throughput and integrated features for lower unit cost, while MAX1186ECM+ replaces parallel simplicity with serial integration-neither offers the same combination of 2 MSPS, on-chip reference, VMID adjustability, and zero-glue parallel interfacing.
Availability
AD7829BRW-1RL7 is available at Aetrix Electronics and suitable for high-speed data acquisition systems, DSP front ends, and mobile communication subsampling applications requiring stable component supply, long-term industrial-grade availability, and guaranteed traceable sourcing.
Supply support for AD7829BRW-1RL7 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 worldwide and ISO 9001-certified manufacturing.
The AD7829 family was designed specifically for high-throughput, low-latency, multi-channel digitization in resource-constrained embedded systems-emphasizing minimal external components, flexible input configuration, and seamless microprocessor integration.
FAQ
What is the maximum sampling rate supported by the AD7829BRW-1RL7?
The AD7829BRW-1RL7 supports a maximum throughput of 2 MSPS (million samples per second), enabled by its 420 ns maximum conversion time. This rate is achievable across all eight input channels when using the parallel interface with proper timing margins for RD, CS, and EOC signals as specified in Table 2 of the datasheet. The AD7829BRW-1RL7 maintains this performance over the full industrial temperature range (−40°C to +85°C) with 3 V or 5 V supply.
Does the AD7829BRW-1RL7 require an external voltage reference?
No, the AD7829BRW-1RL7 includes an on-chip 2.5 V reference with ±2% accuracy and 50 ppm/°C temperature coefficient, accessible via the VREF IN/OUT pin. This internal reference is sufficient for most applications; however, an external precision reference (e.g., AD780) can be connected to VREF IN/OUT if tighter initial accuracy or lower drift is required. The AD7829BRW-1RL7 automatically detects and uses the applied reference source.
How does the VMID pin affect the input voltage range of the AD7829BRW-1RL7?
The VMID pin sets the center point of the AD7829BRW-1RL7's analog input span: with VDD = 3 V, input range becomes VMID ±1.0 V; with VDD = 5 V, it becomes VMID ±1.25 V. When left unconnected, VMID defaults to 1.0 V (3 V mode) or 1.25 V (5 V mode), yielding input ranges of 0 V to 2.0 V or 0 V to 2.5 V respectively. This allows the AD7829BRW-1RL7 to accommodate bipolar signals or compensate for system-level DC offsets without external amplifiers.
Can the AD7829BRW-1RL7 operate from a 3.3 V supply?
Yes-the AD7829BRW-1RL7 is explicitly specified for 3 V ±10% operation, covering 2.7 V to 3.3 V. At 3.3 V, it maintains full 8-bit performance including 420 ns conversion time, 48 dB SNR, and ±0.75 LSB INL/DNL. Input span is automatically configured to 0 V to 2.0 V (centered at 1.0 V), and logic thresholds adapt to 3 V-compatible levels (e.g., VINH ≥ 2.0 V, VINL ≤ 0.4 V). No derating or external adjustments are needed.
What is the purpose of the CONVST pin beyond initiating conversion?
In addition to starting conversion on its falling edge, the CONVST pin enables automatic power-down in the AD7829BRW-1RL7: at the moment EOC goes high, the logic level on CONVST is sampled; if low, the device enters ultra-low-power mode (≤5 μA). This dual-function design eliminates external power-control circuitry and reduces idle power consumption without software intervention-critical for battery-operated or thermally constrained systems using the AD7829BRW-1RL7.
AD7829BRW-1RL7 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:
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7829BRW-1RL7 FAQ
1.How can I place an order for AD7829BRW-1RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7829BRW-1RL7 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 AD7829BRW-1RL7 reliable?
The price and inventory of AD7829BRW-1RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7829BRW-1RL7 is usually 5 days.
3.What payment methods are accepted for AD7829BRW-1RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7829BRW-1RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7829BRW-1RL7?
AD7829BRW-1RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7829BRW-1RL7 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 AD7829BRW-1RL7?
For technical support, including AD7829BRW-1RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7829BRW-1RL7 requirements.
6.How does Aetrix verify that AD7829BRW-1RL7 is sourced from the original manufacturer or authorized distributors?
All AD7829BRW-1RL7 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 AD7829BRW-1RL7 meets industry standards.
7.What is the process for return or replacement of AD7829BRW-1RL7?
All AD7829BRW-1RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7829BRW-1RL7, 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 AD7829BRW-1RL7 part is unused and in its original packaging.
Return procedure for AD7829BRW-1RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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