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Analog Devices Inc. AD7828LNZ
- Part No.:
- AD7828LNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AD7828LNZ.pdf
- Description:
- IC ADC 8BIT FLASH 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,502
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Product details
Overview
AD7828LNZ 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, 2.5 µs per-channel conversion time, and 0 V to 5 V analog input range - used in multichannel data acquisition systems for industrial monitoring and real-time signal analysis.
For engineers reviewing the AD7828LNZ datasheet, AD7828LNZ pinout, AD7828LNZ application, or AD7828LNZ equivalent, this page delivers verified specifications, validated DIP-28 package mapping, confirmed microprocessor interface timing (Mode 0/1), and two documented alternative parts with functional and application-level distinctions.
Technical Context
The AD7828LNZ employs a half-flash architecture: two 4-bit flash ADCs (MSB and LSB) plus an internal 4-bit DAC reconstruct the analog input to generate full 8-bit output. Its track-and-hold function is inherent to the comparator switching structure, requiring no external circuitry for ≤10 kHz signals (157 mV/µs slew rate).
Digital control uses only CS and RD lines - no external clock needed - with address inputs A0–A2 selecting among eight analog channels. It supports two modes: Mode 0 (WAIT-state microprocessors like Z80/MC68000) and Mode 1 (non-WAIT systems like TMS32010), each with distinct timing constraints on tCRD (2.8 µs max), tP (600 ns min), and INT/RDY behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete digital codes across full-scale range |
| Total Unadjusted Error | ±1/2 LSB max - guarantees monotonicity and eliminates need for user trimming |
| Conversion Time | 2.8 µs max (T/U grade) - enables 50 kHz per-channel sampling on all 8 inputs |
| Analog Input Bandwidth | 10 kHz - supports full-scale sinusoidal signals without external sample-and-hold |
| Supply Voltage | 5 V ±5% - simplifies system power design; no dual or split supplies required |
| Power Dissipation | 50 mW typ - low thermal load suitable for dense PCB layouts |
| Input Leakage Current | ±3 µA max - minimizes loading error with high-impedance sensor sources |
Pinout & Package
AD7828LNZ is supplied in a 28-pin plastic DIP (N-28) package, 0.6" wide, with 0.1" lead pitch and through-hole mounting. Pin 1 identifier is a notch or dot; pins are numbered counterclockwise from top-left corner when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0, A1, A2 | Multiplexer Address Inputs | Select one of eight analog input channels (AIN1–AIN8); latched on rising edge of RD in Mode 1 |
| AIN1–AIN8 | Analog Input Channels | Single-ended, 0 V to 5 V range; internally multiplexed to shared ADC core |
| CS | Chip Select | Active-low enable; initiates conversion when pulled low with RD in Mode 0 |
| RD | Read Strobe | Active-low control; triggers conversion start and enables data bus output |
| RDY | Ready Output | Open-drain status signal; goes high-impedance at end of conversion to indicate valid data |
| INT | Interrupt Output | Active-low pulse signaling completion of conversion; resets on rising edge of CS or RD |
| DB0–DB7 | Data Bus Outputs | Three-state, TTL-compatible outputs delivering 8-bit natural binary result |
| VREF (+), VREF (–) | Differential Reference Inputs | Define full-scale range; support ratiometric measurement and offset-adjustable input spans |
| VDD, GND | Power Supply | Single 5 V supply; GND serves as analog and digital reference common |
Key Features
| Feature | Design Value |
|---|---|
| Half-flash conversion architecture | Eliminates need for external clock and reduces conversion latency vs. SAR or sigma-delta ADCs |
| Built-in track-and-hold | Enables direct digitization of 10 kHz full-scale signals without external THS circuitry |
| Microprocessor-compatible interface | Direct connection to Z80, MC68000, or TMS32010 using standard memory or I/O read cycles |
| Channel-to-channel matching | ±1/4 LSB max mismatch ensures consistent gain/offset across all 8 inputs for multi-sensor systems |
| Flexible reference configuration | VREF (+)/VREF (–) differential pair allows unipolar (0–5 V), bipolar (±4 V), or scaled ranges |
Applications
| Industrial Process Monitoring | Real-Time Speech Analysis |
|---|---|
|
Use Scenario: Simultaneous acquisition of temperature, pressure, flow, and voltage signals from distributed sensors in PLC-based control cabinets. IC Role / Device Role / Timing Role: 8-channel front-end ADC performing synchronized sampling at 50 kHz per channel with inherent track-and-hold. Use Value: Reduces BOM count by eliminating external sample-and-hold ICs and simplifies layout with single-supply operation. |
Use Scenario: Real-time spectral analysis of speech signals using banked band-pass filters feeding eight parallel analog paths. IC Role / Device Role / Timing Role: High-speed multiplexed ADC capturing time-aligned samples from filtered voice channels for FFT processing. Use Value: 2.5 µs conversion time enables >10 kHz bandwidth per channel, meeting Nyquist criteria for speech harmonics. |
| Embedded Data Logger | Test & Measurement Instrumentation |
|
Use Scenario: Battery-powered field logger recording environmental parameters (light, humidity, acceleration) over extended periods. IC Role / Device Role / Timing Role: Low-power (50 mW typ) ADC interfacing directly to 8-bit microcontroller via simple CS/RD protocol. Use Value: Single 5 V supply and no clock requirement minimize peripheral components and power management complexity. |
Use Scenario: Modular benchtop instrument acquiring waveforms from multiple transducers during calibration and validation. IC Role / Device Role / Timing Role: Precision 8-bit digitizer with ±1/2 LSB error and tight channel matching for comparative measurements. Use Value: Eliminates inter-channel gain/offset correction in firmware due to guaranteed ±1/4 LSB mismatch. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel 8-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7828KN | Same architecture and pinout; ±1 LSB total unadjusted error (vs. ±1/2 LSB for AD7828LNZ) | Commercial temp range (0°C to 70°C) identical; lower accuracy spec suits cost-sensitive non-critical sensing | Select AD7828KN where 1 LSB error is acceptable and budget constraints outweigh precision requirements |
| MAX195BCPP | 5 V, 16-bit, single-channel SAR ADC; no internal MUX or track-and-hold; requires external clock and driver | Higher resolution but lacks multichannel capability - necessitates external analog multiplexer and THS for 8-input use | Choose MAX195BCPP only when 16-bit resolution is mandatory and system can accommodate added external components and timing complexity |
Compared with AD7828KN, AD7828LNZ provides tighter accuracy without layout or interface changes; compared with MAX195BCPP, it delivers integrated 8-channel sampling at 1/3 the component count and zero clock overhead - critical for compact, deterministic real-time systems.
Availability
AD7828LNZ is available at Aetrix Electronics and suitable for industrial process monitoring, embedded data loggers, real-time speech analysis, and test & measurement instrumentation requiring stable component supply, long-term obsolescence planning, and traceable sourcing.
Supply support for AD7828LNZ 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The AD7828LNZ belongs to Analog Devices' legacy LC2MOS high-speed ADC family, designed specifically for cost-effective, space-constrained multichannel data acquisition in industrial and instrumentation applications where simplicity, speed, and integration outweigh ultra-high resolution.
FAQ
What is the operating temperature range for AD7828LNZ?
The AD7828LNZ is rated for commercial temperature operation from 0°C to +70°C. This range is defined by its "L" grade designation and is validated across all electrical specifications including ±1/2 LSB total unadjusted error, 2.5 µs conversion time, and 10 kHz analog input bandwidth. Operation outside this range may degrade performance or violate absolute maximum ratings.
Does AD7828LNZ require an external clock signal?
No, the AD7828LNZ does not require an external clock. Its half-flash conversion architecture generates timing internally using CS and RD control signals only. This eliminates clock distribution, jitter concerns, and external oscillator components - a key advantage over SAR or sigma-delta ADCs. The AD7828LNZ relies solely on microprocessor-compatible strobes for full operation.
Can AD7828LNZ perform bipolar input measurements?
Yes, the AD7828LNZ supports bipolar operation via external op-amp conditioning (e.g., AD544) and differential reference configuration. With VREF (–) set to 2.5 V and VREF (+) to 5 V, it achieves ±4 V input range and complementary offset binary output coding. The device itself is unipolar, but its fully differential reference inputs enable robust ratiometric and offset-adjusted measurement schemes.
What package type is used for AD7828LNZ?
The AD7828LNZ is packaged in a 28-pin plastic dual-in-line package (PDIP), designated N-28 per Analog Devices' ordering guide. It measures 0.600" × 0.300" with 0.1" lead pitch, features through-hole mounting, and complies with JEDEC MS-011AB standards. No surface-mount variants (e.g., SOIC or PLCC) are assigned to the "LNZ" suffix.
How does the built-in track-and-hold function work in AD7828LNZ?
The AD7828LNZ's track-and-hold is inherent to its half-flash architecture: during conversion initiation, input switches connect the selected channel to both MSB and LSB comparators simultaneously for ~1 µs, capturing the instantaneous value before digitization. This eliminates external THS components while supporting full-scale 10 kHz signals (157 mV/µs slew rate) - verified in TPC 3 and operational diagrams.
AD7828LNZ 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:
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7828LNZ FAQ
1.How can I place an order for AD7828LNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7828LNZ 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 AD7828LNZ reliable?
The price and inventory of AD7828LNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7828LNZ is usually 5 days.
3.What payment methods are accepted for AD7828LNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7828LNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7828LNZ?
AD7828LNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7828LNZ 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 AD7828LNZ?
For technical support, including AD7828LNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7828LNZ requirements.
6.How does Aetrix verify that AD7828LNZ is sourced from the original manufacturer or authorized distributors?
All AD7828LNZ 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 AD7828LNZ meets industry standards.
7.What is the process for return or replacement of AD7828LNZ?
All AD7828LNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7828LNZ, 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 AD7828LNZ part is unused and in its original packaging.
Return procedure for AD7828LNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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