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Analog Devices Inc. AD7828KN
- Part No.:
- AD7828KN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD7828KN.pdf
- Description:
- IC ADC 8BIT 8CH HS 28-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:7,344
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Product details
Overview
AD7828KN 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 LSB total unadjusted error, 2.5 µs per-channel conversion time, and 0 V to 5 V unipolar input range - used in real-time multichannel data acquisition systems such as speech analysis and industrial sensor monitoring.
For engineers reviewing the AD7828KN datasheet, AD7828KN pinout, AD7828KN application, or AD7828KN equivalent, this page delivers verified electrical specifications, validated DIP-28 package mapping, confirmed microprocessor interface timing (Mode 0/1), and two field-tested alternative parts for legacy system upgrades and obsolescence mitigation.
Technical Context
The AD7828KN employs a half-flash architecture: two 4-bit flash ADCs (MSB and LSB stages) plus an internal 4-bit DAC reconstruct the analog input for full 8-bit resolution. Its track-and-hold function is inherent to the comparator switching topology, eliminating external S/H requirements for ≤10 kHz signals.
Digital control uses only CS and RD lines - no external clock needed - with address latching via A0–A2 inputs. It supports both Mode 0 (WAIT-state microprocessors like Z80/MC68000) and Mode 1 (non-WAIT TMS32010), with open-drain RDY and active-low INT outputs for status signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete digital codes across full-scale input range |
| Conversion Time | 2.5 µs per channel - enables 50 kHz per-channel sampling on all 8 inputs |
| Total Unadjusted Error | ±1 LSB max - includes offset, full-scale, and linearity errors without calibration |
| Analog Input Bandwidth | 10 kHz - supports full-scale sinusoidal inputs up to 157 mV/µs slew rate |
| Supply Voltage | 5 V ±5% - single-supply operation simplifies power design vs. dual-rail ADCs |
| Power Dissipation | 50 mW typical - low quiescent current (16 mA max at VDD = 5 V) aids thermal management |
| Input Range | 0 V to 5 V (unipolar) - set by external VREF(+) and VREF(–); ratiometric operation supported |
Pinout & Package
AD7828KN is packaged in a 28-pin plastic DIP (N-28), 0.6" wide, with 0.1" lead pitch and through-hole mounting. Pin 1 identifier notch located at top-left corner when viewed from top with pins down.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN8 | Analog input channels | Eight single-ended inputs; selected via A0–A2 address lines; 0 V to 5 V range |
| A0, A1, A2 | Multiplexer address inputs | Binary-encoded selection of one of eight analog channels (A2 only on AD7828) |
| CS | Chip Select input | Active-low enable; initiates conversion when asserted with RD in Mode 0 |
| RD | Read input | Active-low control; latches address in Mode 1; triggers data output after conversion |
| RDY | Ready status output | Open-drain signal; goes high-impedance at conversion completion (Mode 0 only) |
| INT | Interrupt output | Active-low pulse indicating conversion completion; resets on rising edge of CS or RD |
| DB0–DB7 | Three-state data outputs | 8-bit parallel natural binary output; driven only after conversion completes |
| VREF(+), VREF(–) | Differential reference inputs | Define full-scale range; support offset and ratiometric configurations (e.g., VREF(–) ≠ GND) |
| VDD, GND | Power supply terminals | 5 V logic/analog supply and ground; decoupling required per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track-and-hold | Eliminates need for external S/H circuitry when digitizing ≤10 kHz signals |
| No external clock required | Half-flash architecture self-times conversion; reduces BOM and layout complexity |
| Two-mode digital interface | Mode 0 (WAIT-based) and Mode 1 (non-WAIT) support broad microprocessor compatibility |
| Differential reference inputs | Enable flexible input scaling, offset adjustment, and ratiometric measurement (e.g., sensor bridges) |
| Channel-to-channel matching | ±1/4 LSB max mismatch ensures consistent gain/offset across all 8 channels |
Applications
| Speech Analysis System | Industrial Sensor Data Logger |
|---|---|
|
Use Scenario: Real-time spectral analysis of 8-channel audio input using band-pass filtering before digitization. IC Role / Device Role / Timing Role: Simultaneous sampling of 8 microphone or filter outputs at 50 kHz aggregate rate; RDY-driven WAIT state synchronization. Use Value: Enables deterministic latency and phase coherence across all channels without external sample-hold or clock distribution. |
Use Scenario: Monitoring temperature, pressure, and flow sensors across 8 industrial nodes in a PLC rack. IC Role / Device Role / Timing Role: Centralized 8-channel ADC interfaced to 80C31 microcontroller via Mode 0; INT-triggered data readout. Use Value: Reduces component count vs. eight discrete single-channel ADCs; maintains ±1 LSB accuracy across temperature range 0°C to 70°C. |
| Medical Vital Signs Monitor | Automated Test Equipment (ATE) |
|
Use Scenario: Acquisition of ECG, respiration, SpO₂, and NIBP waveforms in portable diagnostic device. IC Role / Device Role / Timing Role: Multichannel front-end ADC with ratiometric reference for bridge-based sensors; VREF(–) tied to sensor common. Use Value: Compensates for supply rail drift and sensor excitation variations, improving long-term measurement stability. |
Use Scenario: High-throughput functional testing of mixed-signal PCBs requiring synchronized analog stimulus/response capture. IC Role / Device Role / Timing Role: Embedded in test head controller; triggered by pattern generator; data streamed via DB0–DB7 to FPGA buffer. Use Value: 2.5 µs conversion time allows tight test cycle timing; three-state outputs prevent bus contention during idle periods. |
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 package (N-28), same pinout, but ±1/2 LSB total unadjusted error vs. ±1 LSB | Required where higher DC accuracy is critical (e.g., precision calibration fixtures) | Select AD7828LN if tighter error budget justifies cost premium; otherwise AD7828KN suffices for general-purpose DAQ |
| MAX195BCPP | 5 V, 16-bit, 100 kSPS serial-output ADC; no built-in track-and-hold; requires external REF | Used where resolution >8 bits is mandatory, but adds SPI interface complexity and external S/H | Choose MAX195BCPP only when 16-bit resolution is non-negotiable; AD7828KN offers simpler parallel interface and integrated S/H |
Compared with AD7828LN, AD7828KN trades 0.5 LSB accuracy for lower cost and broader availability; versus MAX195BCPP, it provides faster per-channel throughput (50 kHz vs. 100 kSPS shared across channels), native 8-channel mux, and zero-latency track-and-hold - making AD7828KN optimal for cost-sensitive, real-time 8-channel systems.
Availability
AD7828KN is available at Aetrix Electronics and suitable for industrial sensor data loggers, medical vital signs monitors, and automated test equipment requiring stable component supply, long-lifecycle support, and legacy-compatible DIP packaging.
Supply support for AD7828KN 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 Wilmington, MA.
The AD7828KN belongs to Analog Devices' LC2MOS high-speed data acquisition product line, designed specifically for cost-effective, microprocessor-compatible multichannel ADC systems in commercial and industrial environments.
FAQ
What is the maximum analog input frequency the AD7828KN can accurately digitize without an external sample-and-hold?
The AD7828KN can accurately digitize full-scale sinusoidal inputs up to 10 kHz without external sample-and-hold circuitry. This is enabled by its inherent track-and-hold function, which stabilizes the input for ~1 µs after conversion start. The specification assumes 157 mV/µs slew rate and ±1 LSB total unadjusted error across the 0°C to 70°C operating range of the AD7828KN.
Does the AD7828KN require an external clock signal to operate?
No, the AD7828KN does not require an external clock signal. Its half-flash conversion architecture self-times the process using internal timing circuitry. Conversion is initiated solely by asserting CS and RD, making the AD7828KN compatible with microprocessors lacking dedicated ADC clock resources - a key design advantage over SAR or sigma-delta ADCs.
Can the AD7828KN interface directly with a Z80 microprocessor, and which mode should be used?
Yes, the AD7828KN interfaces directly with the Z80 microprocessor using Mode 0 operation. In this configuration, the RDY output drives the Z80's WAIT input, extending the instruction cycle until conversion completes. This eliminates software polling and ensures deterministic timing - a documented implementation shown in Figure 16 of the AD7828KN datasheet.
What is the meaning of "N-28" in the AD7828KN ordering code?
"N-28" denotes the package type: a 28-pin plastic dual-in-line package (PDIP) with 0.6" body width and 0.1" lead pitch. This through-hole package is specified in the AD7828KN ordering guide and matches JEDEC standard MS-011AB. It is distinct from surface-mount variants like R-28 or Q-28, and confirms mechanical compatibility with legacy DIP sockets and wave-solder processes.
How does the AD7828KN handle reference voltage configuration for bipolar input ranges?
The AD7828KN supports bipolar operation via differential reference inputs (VREF(+) and VREF(–)). For example, setting VREF(+) = +2.5 V and VREF(–) = –2.5 V yields an ±4 V input range with complementary offset binary output. This configuration requires external op-amp conditioning (e.g., AD544) as shown in Figure 12 of the AD7828KN datasheet - the AD7828KN itself does not generate negative references.
AD7828KN 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):
- 50k
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- Parallel
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 3
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7828KN FAQ
1.How can I place an order for AD7828KN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7828KN 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 AD7828KN reliable?
The price and inventory of AD7828KN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7828KN is usually 5 days.
3.What payment methods are accepted for AD7828KN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7828KN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7828KN?
AD7828KN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7828KN 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 AD7828KN?
For technical support, including AD7828KN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7828KN requirements.
6.How does Aetrix verify that AD7828KN is sourced from the original manufacturer or authorized distributors?
All AD7828KN 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 AD7828KN meets industry standards.
7.What is the process for return or replacement of AD7828KN?
All AD7828KN units undergo pre-shipment inspection (PSI). If there is an issue with AD7828KN, 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 AD7828KN part is unused and in its original packaging.
Return procedure for AD7828KN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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