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Analog Devices Inc. AD7828LP-REEL
- Part No.:
- AD7828LP-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
AD7828LP-REEL.pdf
- Description:
- 8-BIT FLASH ADC, 8 CHANNEL
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
AD7828LP-REEL from Analog Devices is an 8-channel, 8-bit LC2MOS analog-to-digital converter with built-in track-and-hold, single 5 V supply operation, ±1/2 LSB total unadjusted error, and 2.5 µs per-channel conversion time. It digitizes up to 10 kHz full-scale signals across all eight inputs and interfaces directly to Z80, MC68000, and TMS32010 microprocessors without external clocking.
For engineers reviewing the AD7828LP-REEL datasheet, AD7828LP-REEL pinout, AD7828LP-REEL application, or AD7828LP-REEL equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases in data acquisition and speech analysis, and two validated alternative parts with documented functional and application-level differences.
Technical Context
The AD7828LP-REEL employs a half-flash architecture: two 4-bit flash ADCs-one for MSBs and one for LSBs-combined with an internal 4-bit DAC to reconstruct and subtract the MSB-derived analog value before LSB conversion. This eliminates need for external clock generation and enables deterministic 2.5 µs conversion timing.
It supports two microprocessor interface modes: Mode 0 (WAIT-state driven, RDY/INT status outputs active) and Mode 1 (non-WAIT, INT-only status, requires 2.5 µs inter-conversion delay). Address decoding uses A0–A2 for 8-channel selection, with no missing codes guaranteed over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete digital output levels across 0 V to 5 V input range |
| Total Unadjusted Error | ±1/2 LSB max - ensures monotonicity and eliminates need for system-level trimming |
| Conversion Time | 2.5 µs per channel - enables 50 kHz per-channel sampling rate for 8-channel interleaved acquisition |
| Analog Input Bandwidth | 10 kHz full-scale - supports direct digitization of audio-band signals without external sample-and-hold |
| Supply Voltage | 5 V ±5% - simplifies power design with single rail; IDD = 16 mA max at 5 V |
| Power Dissipation | 50 mW typical - low thermal load suitable for dense PCB layouts and industrial enclosures |
| Operating Temperature | 0°C to +70°C - commercial-grade reliability for embedded instrumentation and test equipment |
Pinout & Package
AD7828LP-REEL is supplied in a 28-pin plastic DIP (P-28A) package with 0.6" width, through-hole mounting, and JEDEC MS-011AB compliance. Pin 1 identifier is located at top-left corner when notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Multiplexer address inputs | Selects one of eight analog channels (AIN1–AIN8); latched on rising edge of RD in Mode 1 |
| AIN1–AIN8 | Analog input terminals | Single-ended inputs referenced to VREF(–); support 0 V to 5 V unipolar or ±4 V bipolar via external op-amp conditioning |
| CS | Chip Select input | Active-low enable; initiates conversion when pulled low with RD in Mode 0; controls address latching in Mode 1 |
| RD | Read strobe input | Active-low control; starts conversion and gates data output; determines latch timing for A0–A2 in Mode 1 |
| RDY | Ready status output | Open-drain, active-low signal indicating conversion completion; requires external pull-up in Mode 0 |
| INT | Interrupt output | Active-low pulse signaling end of conversion; self-clears on rising edge of CS or RD |
| DB0–DB7 | Three-state data outputs | 8-bit parallel natural binary output; high-impedance when CS or RD is high |
| VREF(+), VREF(–) | Differential reference inputs | Define full-scale range; support ratiometric measurement and offset-adjustable input spans (e.g., 2 V span → 7.8 mV/LSB) |
| VDD, GND | Power supply pins | 5 V single supply; GND serves as analog and digital common reference point |
Key Features
| Feature | Design Value |
|---|---|
| Built-in track-and-hold | Eliminates need for external S/H circuitry when digitizing ≤10 kHz signals across all 8 channels |
| No external clock required | Half-flash architecture generates internal timing; simplifies layout and reduces BOM count |
| Two interface modes | Mode 0 supports WAIT-state µPs (Z80, MC68000); Mode 1 supports non-WAIT µPs (TMS32010) with dual-read protocol |
| Tight channel-to-channel matching | ±1/4 LSB max mismatch enables accurate multi-channel differential measurements without calibration |
| Flexible reference architecture | Differential VREF(+) and VREF(–) allow programmable input span, offset, and ratiometric sensor readout |
Applications
| Industrial Data Acquisition | Speech Signal Analysis |
|---|---|
|
Use Scenario: Real-time monitoring of 8 sensor outputs (temperature, pressure, voltage) in PLC I/O modules. IC Role / Device Role / Timing Role: 8-channel simultaneous-sampling ADC with integrated track-and-hold, delivering synchronized 10 kHz bandwidth per channel. Use Value: Reduces system latency and component count by eliminating external sample-and-hold ICs and clock generators. |
Use Scenario: Digitizing 8-band filtered speech signals for voice recognition preprocessing in telecom hardware. IC Role / Device Role / Timing Role: Parallel 8-channel ADC interfaced to TMS32010 DSP using Mode 1 protocol for pipelined acquisition. Use Value: Enables continuous 50 kHz per-channel sampling without µP WAIT states, preserving DSP throughput. |
| Embedded Test Equipment | Multi-Channel Oscilloscope Front-End |
|
Use Scenario: Portable handheld tester capturing transient waveforms from 8 DUT nodes during functional validation. IC Role / Device Role / Timing Role: High-speed 8-bit ADC with ±1/2 LSB accuracy used in Z80-based acquisition subsystem with RDY-driven WAIT. Use Value: Guarantees monotonic response and no missing codes across 0°C to 70°C, ensuring reliable pass/fail decisions. |
Use Scenario: Low-cost 8-channel scope front-end for educational or service applications requiring sub-10 kHz bandwidth. IC Role / Device Role / Timing Role: ADC providing 2.5 µs conversion per channel with direct parallel bus output to FPGA capture logic. Use Value: Delivers deterministic timing and 50 mW power dissipation, enabling fanless enclosure design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel, 8-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7828LN | Same P-28A package and electrical specs, but in tube packaging (not tape-and-reel); identical 0°C to +70°C range and ±1/2 LSB error | No difference in functional implementation; differs only in packaging format and reel logistics | Select AD7828LP-REEL for automated SMT assembly; choose AD7828LN for manual prototyping or low-volume hand-soldering |
| MAX118 | 8-channel, 8-bit SAR ADC with 10 µs conversion time, 2.7 V to 5.25 V supply, and SPI interface - no parallel bus or RDY/INT outputs | Requires external clock and SPI controller; lacks built-in track-and-hold and µP WAIT support | Choose MAX118 only if system already uses SPI infrastructure and can tolerate slower sampling; AD7828LP-REEL remains superior for direct µP bus integration |
Compared with AD7828LN, AD7828LP-REEL offers identical performance in tape-and-reel format for SMT production; compared with MAX118, it provides faster conversion, parallel interface, and integrated track-and-hold - making it optimal for legacy µP-based data loggers and industrial controllers.
Availability
AD7828LP-REEL is available at Aetrix Electronics and suitable for industrial data acquisition, speech analysis systems, and embedded test equipment requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.
Supply support for AD7828LP-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 AD7828LP-REEL belongs to Analog Devices' legacy LC2MOS precision ADC family, designed specifically for cost-sensitive, µP-centric industrial and instrumentation applications requiring multichannel, moderate-speed digitization without external timing components.
FAQ
What is the maximum analog input frequency supported by the AD7828LP-REEL without external sample-and-hold?
The AD7828LP-REEL supports full-scale analog input signals up to 10 kHz across all eight channels without external sample-and-hold circuitry. This capability stems from its inherent track-and-hold function, which stabilizes the selected input for ~1 µs after conversion start. The 157 mV/µs slew rate specification confirms this bandwidth limit under rated accuracy conditions (±1/2 LSB).
Does the AD7828LP-REEL require an external clock signal to operate?
No, the AD7828LP-REEL does not require an external clock signal. Its half-flash conversion architecture uses internal timing derived from the conversion process itself. Only standard microprocessor control signals - CS and RD - are needed to initiate conversion and read data, simplifying system design and reducing component count.
What are the key differences between Mode 0 and Mode 1 operation of the AD7828LP-REEL?
Mode 0 requires microprocessor WAIT-state support (e.g., Z80, MC68000): CS+RD low starts conversion and data appears after RDY goes high. Mode 1 is for non-WAIT µPs (e.g., TMS32010): first READ latches address and starts conversion while outputting prior result; second READ retrieves new data. Mode 1 mandates ≥2.5 µs delay between READs.
Can the AD7828LP-REEL perform bipolar input measurements?
Yes, the AD7828LP-REEL supports bipolar operation via external signal conditioning. Using an op-amp like the AD544, input ranges such as ±4 V can be mapped to the 0 V to 5 V unipolar input range. The reference inputs VREF(+) and VREF(–) are fully differential, allowing offset and span adjustment - the output uses complementary offset binary coding in bipolar mode.
What package type and lead finish does the AD7828LP-REEL use?
The AD7828LP-REEL is packaged in a 28-pin plastic DIP (P-28A) with 0.6" body width, compliant with JEDEC MS-011AB. It features matte tin lead finish, RoHS-compliant, and is supplied on tape-and-reel for automated surface-mount assembly. Pin 1 is identified by a notch at the top-left corner of the package.
AD7828LP-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 50k
- 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:
- Flash
- Reference Type:
- External
- Voltage - Supply, Analog:
- 4.5V ~ 5.5V
- Voltage - Supply, Digital:
- 4.5V ~ 5.5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PLCC (11.51x11.51)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7828LP-REEL FAQ
1.How can I place an order for AD7828LP-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7828LP-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 AD7828LP-REEL reliable?
The price and inventory of AD7828LP-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7828LP-REEL is usually 5 days.
3.What payment methods are accepted for AD7828LP-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7828LP-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7828LP-REEL?
AD7828LP-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7828LP-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 AD7828LP-REEL?
For technical support, including AD7828LP-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7828LP-REEL requirements.
6.How does Aetrix verify that AD7828LP-REEL is sourced from the original manufacturer or authorized distributors?
All AD7828LP-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 AD7828LP-REEL meets industry standards.
7.What is the process for return or replacement of AD7828LP-REEL?
All AD7828LP-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7828LP-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 AD7828LP-REEL part is unused and in its original packaging.
Return procedure for AD7828LP-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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