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Analog Devices Inc. AD7828LP
- Part No.:
- AD7828LP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
AD7828LP.pdf
- Description:
- IC ADC 8BIT FLASH 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,325
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Product details
Overview
AD7828LP from Analog Devices is an 8-channel, 8-bit LC2MOS successive-approximation 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 0 V to 5 V analog inputs across eight multiplexed channels and is used in real-time data acquisition systems such as speech analysis and multichannel sensor monitoring.
For engineers reviewing the AD7828LP datasheet, AD7828LP pinout, AD7828LP application, or AD7828LP equivalent, key selection considerations include its 8-channel multiplexer address decoding (A0–A2), open-drain RDY/INT outputs, 28-pin PDIP package (P-28A), microprocessor-compatible parallel interface, and support for Mode 0/Mode 1 timing without external clock generation.
Technical Context
The AD7828LP 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 clocking and enables deterministic 2.5 µs conversion time per channel.
Its analog input structure inherently provides track-and-hold functionality, requiring input stability only for ~1 µs after conversion start-not the full 2.5 µs-enabling accurate digitization of 10 kHz sinusoidal signals (157 mV/µs slew rate) without external sample-and-hold circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete digital codes over full-scale range |
| Total Unadjusted Error | ±1/2 LSB max - ensures monotonicity and no missing codes at 8-bit resolution |
| Conversion Time | 2.5 µs per channel - supports up to 50 kHz per-channel sampling rate in 8-channel mode |
| Analog Input Range | 0 V to 5 V (with external 5 V reference) - compatible with standard logic-level sensor outputs |
| Supply Voltage | 5 V ±5% - simplifies system power design with single rail; no dual or split supplies required |
| Power Dissipation | 50 mW typical - enables use in thermally constrained embedded systems without forced cooling |
| Input Bandwidth | 10 kHz full-scale signal handling - supports direct digitization of audio-band and industrial control signals |
Pinout & Package
AD7828LP is packaged in a 28-pin plastic DIP (P-28A), 0.6" wide, with 0.1" lead pitch and through-hole mounting. Pin 1 identifier is marked by notch or dot; pin 14 is GND, pin 28 is VDD.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Multiplexer Address Inputs | Select one of eight analog input channels (AIN1–AIN8); latched on rising edge of RD in Mode 1 |
| CS | Chip Select | Active-low enable for conversion initiation and data output enable; controls RDY/INT assertion timing |
| RD | Read Strobe | Active-low signal that triggers conversion (Mode 0) or reads prior result (Mode 1); synchronizes data bus access |
| RDY | Ready Output | Open-drain status flag indicating conversion completion; requires external pull-up for microprocessor WAIT state generation |
| INT | Interrupt Output | Active-low interrupt signaling end of conversion; returns high on rising edge of CS or RD |
| DB0–DB7 | Data Bus Outputs | Three-state parallel outputs delivering 8-bit natural binary code; driven only after conversion completes |
| VREF (+), VREF (–) | Differential Reference Inputs | Define full-scale range (e.g., 5 V span → 19.5 mV/LSB); support ratiometric and offset-adjusted measurements |
| AIN1–AIN8 | Analog Input Channels | Single-ended inputs accepting 0 V to 5 V; internally sampled simultaneously by 31 comparator capacitors during conversion |
Key Features
| Feature | Design Value |
|---|---|
| Half-flash conversion architecture | Eliminates need for external ADC clock; enables deterministic 2.5 µs conversion time and simplified timing control |
| Built-in track-and-hold function | Reduces requirement for external S/H circuitry; allows stable digitization of 10 kHz signals with ≤100 Ω source impedance |
| Microprocessor-compatible parallel interface | Direct connection to Z80, MC68000, TMS32010 via standard CS/RD handshake; supports both WAIT-based (Mode 0) and non-WAIT (Mode 1) operation |
| Differential reference inputs | Enable ratiometric sensing, offset-adjusted unipolar/bipolar operation (e.g., ±4 V with AD544 op amp), and flexible full-scale scaling |
| LC2MOS process technology | Delivers 50 mW typical power dissipation at 5 V supply while maintaining CMOS logic compatibility and ESD robustness |
Applications
| Speech Analysis System | Industrial Sensor Data Logger |
|---|---|
Use Scenario: Real-time spectral analysis of voice signals using eight parallel band-pass filters feeding into AIN1–AIN8. IC Role / Device Role / Timing Role: Simultaneous digitization of eight filtered audio channels at ≥10 kHz bandwidth per channel with inherent track-and-hold. Use Value: Eliminates eight external sample-and-hold amplifiers and reduces board space, BOM count, and timing skew between channels. |
Use Scenario: Monitoring temperature, pressure, flow, and humidity sensors across eight industrial nodes in a PLC I/O module. IC Role / Device Role / Timing Role: Centralized 8-channel ADC interfacing to 80C51 microcontroller via Mode 0 with RDY-driven WAIT states. Use Value: Single-chip solution replaces multiple 4-channel ADCs; 50 mW power enables fanless enclosure design in DIN-rail mounted enclosures. |
| Medical Vital Signs Monitor | Automotive Engine Control Unit Test Rig |
Use Scenario: Acquisition of ECG, respiration, SpO₂, NIBP, temperature, and motion sensor outputs in portable patient monitor. IC Role / Device Role / Timing Role: High-fidelity digitization of low-noise analog front-end outputs with <±1/2 LSB linearity error and 10 kHz signal fidelity. Use Value: Meets clinical accuracy requirements without post-conversion calibration; supports FDA-cleared Class II device certification path. |
Use Scenario: Hardware-in-the-loop (HIL) testing of ECU firmware using simulated sensor inputs (TPS, MAP, O₂, coolant temp, etc.) across eight channels. IC Role / Device Role / Timing Role: Deterministic 2.5 µs conversion enables precise timestamping of sensor events synchronized to ECU clock domain. Use Value: Enables cycle-accurate validation of closed-loop fuel injection and ignition timing algorithms under dynamic load conditions. |
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 28-pin PDIP (N-28) package; identical electrical specs but commercial-grade (0°C to 70°C) and ±1/2 LSB error; no P-28A mechanical variant | Requires PCB redesign due to different body width (0.6" vs. 0.3") and leadform; not drop-in compatible | Select AD7828LN only if existing N-24/N-28 footprint is available and thermal margin permits wider package |
| MAX118BCNG+ | 8-channel, 8-bit SAR ADC in 28-pin SOIC; 2.5 µs conversion, but requires external clock and lacks built-in track-and-hold | Needs external 5 V reference, clock generator, and S/H circuitry; higher system-level component count | Choose MAX118BCNG+ only when surface-mount assembly is mandatory and board area allows added passive components |
Compared with AD7828LN and MAX118BCNG+, the AD7828LP offers direct pin compatibility with P-28A sockets, eliminates clock and S/H dependencies, and delivers guaranteed ±1/2 LSB performance in its specified commercial temperature range-reducing design validation effort and test coverage scope.
Availability
AD7828LP is available at Aetrix Electronics and suitable for real-time speech analysis, industrial sensor data logging, and medical vital signs monitoring requiring stable component supply, long-term obsolescence management, and traceable lot-level documentation.
Supply support for AD7828LP 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA, with R&D centers worldwide and ISO 9001-certified manufacturing.
The AD7828LP belongs to Analog Devices' legacy LC2MOS precision data acquisition product line, designed specifically for cost-sensitive, microprocessor-based multichannel measurement systems requiring integrated timing, low power, and minimal external components.
FAQ
What is the operating temperature range of the AD7828LP?
The AD7828LP is rated for commercial operation from 0°C to +70°C. This range is defined by its "L" grade designation and applies to all electrical specifications in the datasheet unless otherwise noted. The device is not qualified for industrial (–40°C to +85°C) or extended (–55°C to +125°C) temperature operation. For designs requiring wider ambient tolerance, consider AD7828BQ or AD7828CQ variants instead of the AD7828LP.
Does the AD7828LP require an external clock signal to operate?
No, the AD7828LP does not require an external clock signal. Its half-flash conversion architecture uses internal timing control driven solely by CS and RD strobes. This eliminates clock distribution, jitter concerns, and external oscillator BOM cost-making it ideal for noise-sensitive or space-constrained applications where the AD7828LP serves as a self-contained ADC subsystem.
How does the AD7828LP handle analog input settling during conversion?
The AD7828LP's analog input settles for approximately 1 µs after CS/RD assertion-not the full 2.5 µs conversion time-due to its inherent track-and-hold behavior. To meet ±1/2 LSB accuracy, analog source impedance must be ≤100 Ω. This requirement is explicitly verified in the AD7828LP datasheet and confirmed by its 1 pF comparator input capacitance and 3–6 kΩ switch resistance model.
Can the AD7828LP be used in bipolar input configurations?
Yes, the AD7828LP supports bipolar operation via external signal conditioning. Using an AD544 op amp configured as shown in Figure 12 of the datasheet, the AD7828LP accepts ±4 V inputs and outputs complementary offset binary codes. The AD7828LP itself remains unipolar (0 V to 5 V input range), but its fully differential VREF (+)/VREF (–) inputs enable this flexible front-end design without modification to the AD7828LP.
What is the meaning of "P-28A" in the AD7828LP ordering code?
"P-28A" denotes the AD7828LP's specific 28-pin plastic DIP package variant: 0.6" wide body, 0.1" lead pitch, standard JEDEC MS-011AB outline, and through-hole mounting. It is mechanically distinct from the narrower N-28 package. The "P" prefix identifies this as the original Analog Devices proprietary PDIP variant used for the AD7828LP, ensuring correct socket and reflow profile selection during manufacturing.
AD7828LP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PLCC (11.51x11.51)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7828LP FAQ
1.How can I place an order for AD7828LP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7828LP 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 reliable?
The price and inventory of AD7828LP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7828LP is usually 5 days.
3.What payment methods are accepted for AD7828LP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7828LP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7828LP?
AD7828LP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7828LP 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?
For technical support, including AD7828LP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7828LP requirements.
6.How does Aetrix verify that AD7828LP is sourced from the original manufacturer or authorized distributors?
All AD7828LP 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 meets industry standards.
7.What is the process for return or replacement of AD7828LP?
All AD7828LP units undergo pre-shipment inspection (PSI). If there is an issue with AD7828LP, 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 part is unused and in its original packaging.
Return procedure for AD7828LP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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