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Analog Devices Inc. AD7829BN
- Part No.:
- AD7829BN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD7829BN.pdf
- Description:
- IC ADC 8BIT 8CH 2MSPS 28-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:14,421
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Product details
Overview
AD7829BN from Analog Devices is a high-speed, 8-bit, 8-channel analog-to-digital converter (ADC) with 2 MSPS throughput, 420 ns conversion time, on-chip 2.5 V reference, and parallel microprocessor interface - used in DSP front ends and subsampling applications requiring fast acquisition of multiple analog signals.
For engineers reviewing the AD7829BN datasheet, AD7829BN pinout, AD7829BN application, or AD7829BN equivalent, key selection criteria include channel count (8 single-ended), supply flexibility (3 V ±10% or 5 V ±10%), track-and-hold acquisition time (200 ns), SNR at 30 kHz (48 dB min), and automatic power-down via CONVST logic level sampling at EOC assertion.
Technical Context
The AD7829BN implements an 8-bit half-flash architecture: a coarse 4-bit flash stage followed by a fine 4-bit flash stage, achieving full conversion in ≤420 ns. Its track-and-hold amplifier supports full-power bandwidth up to 10 MHz and features VMID-adjustable input span centering.
Channel selection is performed externally via A0–A2 address inputs synchronized with RD; conversion is initiated on the falling edge of CONVST, and end-of-conversion is signaled by EOC. Power-down is automatically triggered when CONVST is low at EOC assertion - no separate PD pin required (unlike AD7822/AD7825).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - guarantees monotonic output and no missing codes over full temperature range (−40°C to +85°C). |
| Max Throughput | 2 MSPS - enables real-time sampling of high-frequency signals such as IF stages in mobile comms or disk drive servo loops. |
| Conversion Time | 420 ns max - defines minimum inter-conversion interval; allows >2 MSPS sustained rate with proper timing margins. |
| 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; centered via VMID pin. |
| SNR @ 30 kHz | 48 dB min - sets usable dynamic range for baseband digitization in data acquisition systems. |
| INL / DNL | ±0.75 LSB max each - ensures accurate amplitude fidelity across full code range without code-width anomalies. |
| Power-Down Current | 5 μA max - reduces idle power in battery-sensitive portable instrumentation or burst-mode sensing. |
Pinout & Package
The AD7829BN is housed in a 28-lead, 0.6" wide plastic dual in-line package (PDIP), with 0.1" lead pitch and through-hole mounting compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1–VIN8 | Analog Input Channels | Eight single-ended inputs; voltage range determined by VDD (2.5 V p-p @ 5 V, 2 V p-p @ 3 V); span center adjustable via VMID. |
| CONVST | Convert Start / Power-Down Control | Falling edge initiates conversion and places T/H in hold mode; logic level sampled at EOC rising edge to enable automatic power-down. |
| EOC | End-of-Conversion Output | Active-low pulse (min 70 ns, max 110 ns) signals completion; used to trigger microcontroller ISR or latch data in external logic. |
| RD | Read Strobe Input | Enables output drivers only when CS is also low; data valid within 10 ns (3 V) or 5 ns (5 V) after RD goes low. |
| CS | Chip Select Input | Must be low with RD to activate parallel bus; allows shared data bus operation in multi-peripheral systems. |
| A0–A2 | Channel Address Inputs | 3-bit binary select for VIN1–VIN8; latched on falling edge of RD to configure multiplexer prior to conversion. |
| DB0–DB7 | Parallel Data Outputs | 8-bit straight-binary output; high-impedance when RD/CS inactive; driven after RD low with taccess ≤ 10 ns (3 V) or 5 ns (5 V). |
| VREF IN/OUT | Reference I/O | Provides access to internal 2.5 V ±50 mV reference; can accept external reference (2.45–2.55 V) for improved accuracy. |
| VMID | Input Span Center | Sets midpoint of analog input range (AGND to VDD); default = 1.25 V @ 5 V, 1.0 V @ 3 V if left unconnected. |
| VDD | Supply Voltage | Single supply: 2.7–3.3 V or 4.5–5.5 V; powers analog and digital sections; enables auto-detection of operating voltage mode. |
| AGND / DGND | Analog & Digital Grounds | Separate pins minimize noise coupling; recommended to tie together at single point near device for optimal SNR. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel single-ended input mux | Eliminates need for external multiplexer in multi-sensor DAQ systems; channel selected via A0–A2 before RD strobe. |
| On-chip 2.5 V reference (±2%) | Removes dependency on external precision reference; reduces BOM count and layout area in space-constrained designs. |
| Automatic power-down on CONVST | Reduces average current to 5 μA between conversions without software overhead or extra control lines. |
| Track-and-hold FPBW = 10 MHz | Supports faithful digitization of IF signals up to 10 MHz - suitable for undersampling architectures in SDR and spectrum analyzers. |
| Flexible 3 V / 5 V operation | Enables reuse across legacy 5 V and modern low-voltage embedded platforms without redesigning power delivery. |
Applications
| Disk Drive Servo Control | Mobile Communication IF Sampling |
|---|---|
|
Use Scenario: Real-time position error signal (PES) acquisition from read/write head sensors during track-following. IC Role / Device Role / Timing Role: ADC digitizes eight differential analog PES channels at ≥1 MSPS to feed servo loop controller. Use Value: 8-channel integration eliminates external MUX and reduces latency; 420 ns conversion enables tight servo loop timing. |
Use Scenario: Subsampling of 100–200 MHz IF signals in GSM/EDGE receivers using bandpass sampling technique. IC Role / Device Role / Timing Role: ADC captures instantaneous IF samples at 2 MSPS with 10 MHz FPBW track-and-hold. Use Value: On-chip 2.5 V reference and 48 dB SNR ensure stable digitization without external calibration or trimming. |
| Data Acquisition Front End | DSP-Based Vibration Monitoring |
|
Use Scenario: Simultaneous capture of temperature, pressure, and acceleration sensor outputs in industrial PLC modules. IC Role / Device Role / Timing Role: ADC interfaces directly to 8051 or ADSP-21xx DSP via parallel bus with EOC-driven interrupt. Use Value: Flexible 3 V/5 V supply and VMID-adjustable input span simplify analog conditioning for diverse sensor types. |
Use Scenario: High-speed transient capture of bearing vibration waveforms in predictive maintenance edge nodes. IC Role / Device Role / Timing Role: ADC performs burst-mode sampling at 2 MSPS, storing data to external FIFO or SRAM. Use Value: Automatic power-down between bursts cuts average current to <100 μA, extending battery life in wireless sensors. |
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 |
|---|---|---|---|
| AD7825BN | 4-channel version in 24-lead PDIP/SOIC/TSSOP; shares same 420 ns conversion time, 2.5 V ref, and CONVST power-down logic. | Limited to four inputs; lacks A2 pin and VIN5–VIN8; lower pin count reduces PCB footprint but requires external MUX for >4 signals. | Select AD7825BN when system requires only four analog inputs and board space is constrained. |
| MAX1186BCPP+ | 8-channel, 8-bit, 2 MSPS SAR ADC (not half-flash); 3.3 V only; external reference required; no VMID or auto power-down. | Higher power (15 mA active), no on-chip reference, and no input span centering - increases external component count and design complexity. | Choose MAX1186BCPP+ only if 3.3 V-only operation and SAR architecture are mandatory; otherwise AD7829BN offers superior integration. |
Compared with AD7825BN, AD7829BN adds four more analog inputs and one address line (A2), enabling direct 8-channel sampling without external switching. Compared with MAX1186BCPP+, AD7829BN delivers integrated reference, VMID-based input offset, and automatic power-down - reducing total solution size and power management overhead.
Availability
AD7829BN is available at Aetrix Electronics and suitable for disk drive servo control, mobile communication IF sampling, and industrial data acquisition systems requiring stable component supply and long-term obsolescence planning.
Supply support for AD7829BN 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 was designed specifically for high-speed, microprocessor-compatible data acquisition in cost-sensitive, space-constrained applications - emphasizing integration (on-chip ref, T/H, MUX), low power, and flexible supply operation.
FAQ
What is the maximum sampling rate supported by the AD7829BN?
The AD7829BN supports a maximum throughput of 2 MSPS, corresponding to a guaranteed maximum conversion time of 420 ns. This rate assumes proper timing compliance - including minimum CONVST pulse width (20 ns), setup/hold times for RD and address lines, and adequate track-and-hold acquisition (200 ns) after channel changes. At 2 MSPS, the AD7829BN delivers full 8-bit resolution with 48 dB SNR at 30 kHz input frequency.
Does the AD7829BN require an external reference voltage?
No, the AD7829BN does not require an external reference voltage. It integrates a 2.5 V ±2% on-chip reference accessible at the VREF IN/OUT pin. This reference can be used directly, or an external 2.45–2.55 V source may be connected for improved accuracy. When using the internal reference, the VREF IN/OUT pin may be left unconnected or decoupled to AGND with a 0.1 µF capacitor - simplifying design and reducing BOM count compared to reference-dependent alternatives like the MAX1186BCPP+.
How does automatic power-down work on the AD7829BN?
Automatic power-down on the AD7829BN is controlled solely by the logic state of the CONVST pin at the moment the EOC signal rises. If CONVST is low when EOC goes high, the device enters power-down mode, drawing only 5 µA. This occurs without software intervention or additional control pins - unlike the AD7822/AD7825, which require a dedicated PD pin. The feature enables ultra-low average power in burst-sampling applications, and full functionality resumes on the next falling edge of CONVST.
Can the AD7829BN operate from a 3.3 V supply?
No, the AD7829BN is not specified for 3.3 V operation. Its absolute supply range is 2.7–3.3 V for 3 V ±10% mode and 4.5–5.5 V for 5 V ±10% mode. While 3.3 V falls within the upper limit of the 3 V range, Analog Devices specifies performance only at nominal 3 V (±10%, i.e., 2.7–3.3 V) and 5 V (±10%, i.e., 4.5–5.5 V), with input span, reference accuracy, and timing parameters validated at those points. Operation at exactly 3.3 V is outside the tested and guaranteed specification window and may affect SNR, INL, or power-down behavior.
What is the function of the VMID pin on the AD7829BN?
The VMID pin on the AD7829BN sets the center voltage of the analog input span - allowing the 2.5 V (at 5 V supply) or 2 V (at 3 V supply) input range to be centered anywhere between AGND and VDD. For example, connecting VMID to 1.5 V shifts the input range from 0–2.5 V to 0.25–2.75 V. If left unconnected, VMID defaults to 1.25 V (5 V mode) or 1.0 V (3 V mode), yielding standard 0–2.5 V or 0–2 V ranges. This feature reduces requirements on external op-amp rail-to-rail swing and accommodates system-level DC offsets.
AD7829BN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7829BN FAQ
1.How can I place an order for AD7829BN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7829BN 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 AD7829BN reliable?
The price and inventory of AD7829BN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7829BN is usually 5 days.
3.What payment methods are accepted for AD7829BN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7829BN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7829BN?
AD7829BN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7829BN 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 AD7829BN?
For technical support, including AD7829BN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7829BN requirements.
6.How does Aetrix verify that AD7829BN is sourced from the original manufacturer or authorized distributors?
All AD7829BN 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 AD7829BN meets industry standards.
7.What is the process for return or replacement of AD7829BN?
All AD7829BN units undergo pre-shipment inspection (PSI). If there is an issue with AD7829BN, 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 AD7829BN part is unused and in its original packaging.
Return procedure for AD7829BN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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