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Analog Devices Inc. AD7828KP-REEL
- Part No.:
- AD7828KP-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
AD7828KP-REEL.pdf
- Description:
- IC ADC 8BIT FLASH 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,229
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Product details
Overview
AD7828KP-REEL 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 LSB total unadjusted error, 2.5 µs per-channel conversion time, and 0 V to 5 V unipolar input range - used in multichannel data acquisition systems for industrial process monitoring and real-time speech analysis.
For engineers reviewing the AD7828KP-REEL datasheet, AD7828KP-REEL pinout, AD7828KP-REEL application, or AD7828KP-REEL equivalent, this page delivers verified technical context, package-specific pin mapping, confirmed timing behavior in Mode 0/1, real-world interface examples (Z80/MC68000/TMS32010), and validated alternative options for 8-channel 8-bit ADC selection.
Technical Context
The AD7828KP-REEL implements a half-flash architecture using two 4-bit flash ADCs: the MSB flash generates the upper 4 bits and drives an internal DAC to reconstruct the analog input; the residual voltage is digitized by the LSB flash to produce the full 8-bit result. This eliminates external clock requirements and enables deterministic conversion timing.
It supports dual-mode microprocessor interfacing: Mode 0 uses RDY/INT to assert WAIT/DTACK for synchronous read-after-convert, while Mode 1 performs pipelined operation where each RD reads prior result and initiates next conversion - requiring ≥2.5 µs inter-read delay. Address latching occurs on RD rising edge in Mode 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete digital codes across full-scale range |
| Total Unadjusted Error | ±1 LSB max - guarantees monotonicity and no missing codes without calibration |
| Conversion Time | 2.5 µs per channel (Mode 0) - enables 50 kHz per-channel sampling on all 8 inputs |
| Analog Input Bandwidth | 10 kHz full-scale signal handling - supports direct digitization of audio-band signals without external S/H |
| Supply Voltage | 5 V ±5% - simplifies system power design with single-rail operation |
| Power Dissipation | 50 mW typical - enables dense multichannel DAQ designs without thermal derating |
| Digital Interface | Standard CS/RD control with three-state DB0–DB7 outputs - compatible with Z80, MC68000, TMS32010, and similar 8-bit/16-bit microprocessors |
Pinout & Package
AD7828KP-REEL is packaged in a 28-lead plastic DIP (P-28A), 0.6" wide, with 0.1" lead pitch and through-hole mounting. Pin 1 identifier is a beveled corner; pin 14 is GND; pin 28 is VDD.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN8 | Analog input channels | Eight single-ended inputs selectable via A0/A1/A2 address lines; support 0 V to 5 V unipolar or ±4 V bipolar (with external op amp) |
| A0, A1, A2 | Multiplexer address inputs | Binary-encoded channel selection (A2 only active on AD7828); latched on RD rising edge in Mode 1 |
| CS | Chip select input | Active-low enable; initiates conversion when pulled low with RD in Mode 0; resets INT output |
| RD | Read strobe input | Active-low control; starts conversion in Mode 0; latches address and triggers read in Mode 1 |
| RDY | Ready status output | Open-drain signal indicating conversion completion (goes high-Z at end of Mode 0 conversion) |
| INT | Interrupt output | Active-low pulse signaling conversion completion; returns high on CS or RD rising edge |
| DB0–DB7 | Three-state data outputs | 8-bit parallel natural binary output; driven only after conversion completes in Mode 0 or previous result in Mode 1 |
| VREF(+), VREF(–) | Differential reference inputs | Define full-scale range (e.g., 5 V span → 19.5 mV/LSB); support ratiometric and offset configurations |
| VDD, GND | Power supply terminals | Single 5 V supply; GND serves as analog and digital common reference point |
Key Features
| Feature | Design Value |
|---|---|
| Built-in track-and-hold | Eliminates need for external sample-and-hold circuitry when digitizing up to 10 kHz full-scale signals |
| No external clock required | Half-flash architecture self-times conversion - reduces BOM count and layout complexity |
| Two interface modes | Mode 0 supports WAIT-state microprocessors (Z80/MC68000); Mode 1 enables pipelined operation for non-WAIT CPUs (TMS32010) |
| Channel-to-channel matching | ±1/4 LSB max mismatch - ensures consistent gain/offset across all 8 inputs for multi-sensor systems |
| Differential reference flexibility | VREF(–) sets zero-code point; VREF(+) sets full-scale - enables bipolar, ratiometric, and offset input configurations |
Applications
| Industrial Process Monitoring | Real-Time Speech Analysis |
|---|---|
|
Use Scenario: Simultaneous acquisition of temperature, pressure, flow, and level sensor outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: 8-channel ADC front-end with integrated track-and-hold, converting analog sensor voltages into microprocessor-readable digital values at 50 kHz aggregate rate. Use Value: Reduces component count vs. discrete S/H + SAR solutions; maintains ±1 LSB accuracy across all channels without trimming. |
Use Scenario: Digitizing eight microphone or filter-bank outputs in voice recognition hardware for telecom or security systems. IC Role / Device Role / Timing Role: Real-time 10 kHz per-channel sampling engine feeding time-domain feature extraction algorithms on DSP or microcontroller. Use Value: Enables true parallel acquisition of speech band signals without inter-channel skew or external synchronization overhead. |
| Automated Test Equipment (ATE) | Medical Instrumentation |
|
Use Scenario: Multi-point voltage/current measurement during functional testing of PCB assemblies with programmable channel sequencing. IC Role / Device Role / Timing Role: High-speed, low-error ADC subsystem interfaced to test controller via standard memory-mapped bus (e.g., Z80 Mode 0). Use Value: Achieves 2.5 µs/channel conversion with guaranteed monotonicity - critical for pass/fail threshold validation at production speed. |
Use Scenario: Acquisition of ECG, EMG, or respiration sensor waveforms in portable diagnostic devices requiring compact, low-power analog front-ends. IC Role / Device Role / Timing Role: Low-power 8-bit digitizer operating from single 5 V rail, supporting battery-powered operation with 50 mW typical dissipation. Use Value: Meets clinical accuracy requirements (±1 LSB) while minimizing heat generation and board space in handheld enclosures. |
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 |
|---|---|---|---|
| AD7828LP-REEL | Same package and pinout; ±1/2 LSB total unadjusted error (vs. ±1 LSB for AD7828KP-REEL) | Higher accuracy required in precision sensor interfaces where calibration is impractical | Select AD7828LP-REEL when tighter linearity and offset matching are mandatory; same footprint and timing |
| MAX118ACPP+ | 12-bit resolution, SPI interface, 100 kSPS aggregate rate; requires external reference and clock | Applications needing higher resolution and serial interface in space-constrained designs | Choose MAX118ACPP+ for upgraded resolution and smaller SOIC-28 package; not pin-compatible but functionally overlapping |
Compared with AD7828KP-REEL, AD7828LP-REEL offers improved accuracy without layout changes, while MAX118ACPP+ trades parallel interface simplicity for higher resolution and serial flexibility - making the former ideal for accuracy upgrades and the latter for resolution-critical, space-limited systems.
Availability
AD7828KP-REEL is available at Aetrix Electronics and suitable for industrial process monitoring, real-time speech analysis, automated test equipment, and portable medical instrumentation requiring stable component supply and long-term obsolescence management.
Supply support for AD7828KP-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7828KP-REEL belongs to Analog Devices' legacy LC2MOS precision data acquisition family, designed specifically for cost-sensitive, multichannel 8-bit ADC applications demanding single-supply operation, microprocessor compatibility, and minimal external components.
FAQ
What is the operating temperature range of the AD7828KP-REEL?
The AD7828KP-REEL is rated for commercial operation from 0°C to +70°C. This temperature grade is defined by the "K" suffix in the part number and is validated per the AD7824/AD7828 REV. F datasheet specifications under K/L versions. The device meets all electrical performance parameters - including ±1 LSB total unadjusted error and 2.5 µs conversion time - across this full range.
Does the AD7828KP-REEL require an external clock signal?
No, the AD7828KP-REEL does not require an external clock signal. Its half-flash conversion architecture internally times the conversion process, eliminating the need for clock generation circuitry. This is confirmed in the Functional Block Diagram and General Description sections of the datasheet, which state "no clock signal is required for the ADC" - simplifying system design and reducing component count.
How is channel selection implemented on the AD7828KP-REEL?
Channel selection on the AD7828KP-REEL is performed using three address inputs: A0, A1, and A2. These pins accept binary-coded signals to select one of eight analog inputs (AIN1–AIN8), as defined in Table I of the datasheet. In Mode 1, the address is latched on the rising edge of RD; in Mode 0, the address must remain stable while CS and RD are low.
What is the purpose of the RDY and INT outputs on the AD7828KP-REEL?
The RDY output is an open-drain ready signal that goes high-impedance when conversion completes in Mode 0 - used to drive a microprocessor's WAIT input. The INT output is an active-low interrupt that pulses low upon conversion completion and returns high on the rising edge of CS or RD. In Mode 1, RDY must be tied to GND and provides no status; only INT indicates completion.
Can the AD7828KP-REEL operate with a reference voltage less than 5 V?
Yes, the AD7828KP-REEL supports fully differential reference inputs (VREF(+) and VREF(–)), enabling operation with any reference span from 1 V to 5 V. Reducing the reference span increases sensitivity - e.g., a 2 V span yields 7.8 mV/LSB - and facilitates ratiometric measurements where the reference tracks sensor excitation. This capability is explicitly documented in the "Applying the AD7824/AD7828" section.
AD7828KP-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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:
- -
AD7828KP-REEL FAQ
1.How can I place an order for AD7828KP-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7828KP-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 AD7828KP-REEL reliable?
The price and inventory of AD7828KP-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7828KP-REEL is usually 5 days.
3.What payment methods are accepted for AD7828KP-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7828KP-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7828KP-REEL?
AD7828KP-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7828KP-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 AD7828KP-REEL?
For technical support, including AD7828KP-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7828KP-REEL requirements.
6.How does Aetrix verify that AD7828KP-REEL is sourced from the original manufacturer or authorized distributors?
All AD7828KP-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 AD7828KP-REEL meets industry standards.
7.What is the process for return or replacement of AD7828KP-REEL?
All AD7828KP-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7828KP-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 AD7828KP-REEL part is unused and in its original packaging.
Return procedure for AD7828KP-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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