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Analog Devices Inc. AD7824KR-REEL
- Part No.:
- AD7824KR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7824KR-REEL.pdf
- Description:
- IC ADC 8BIT FLASH 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,847
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Product details
Overview
AD7824KR-REEL from Analog Devices is a 4-channel, 8-bit LC2MOS analog-to-digital converter with built-in track-and-hold, single 5 V supply operation, ±1 LSB total unadjusted error, and 2.5 µs per-channel conversion time. It digitizes 0 V to 5 V analog inputs across four multiplexed channels and is used in real-time data acquisition systems such as speech analysis and multichannel sensor monitoring.
For engineers reviewing the AD7824KR-REEL datasheet, AD7824KR-REEL pinout, AD7824KR-REEL application, or AD7824KR-REEL equivalent, key selection criteria include its 4-channel multiplexing capability, no-external-clock half-flash architecture, 10 kHz full-scale signal handling, and compatibility with Z80, MC68000, and TMS32010 microprocessor interfaces.
Technical Context
The AD7824KR-REEL implements a half-flash conversion architecture using two 4-bit flash ADCs - one for MSBs and one for LSBs - with an internal 4-bit DAC bridging them. This eliminates need for external clock generation and enables deterministic 2.5 µs conversion time per selected channel.
It features a 4-channel analog multiplexer controlled by A0/A1 address lines, three-state parallel digital outputs (DB0–DB7), and dual status signals (RDY open-drain, INT active-low) for microprocessor handshaking in Mode 0 (WAIT-based) or Mode 1 (non-WAIT) timing configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes over full-scale range |
| Total Unadjusted Error | ±1 LSB max - guarantees monotonicity and no missing codes without calibration |
| Conversion Time | 2.5 µs per channel - enables 100 kHz per-channel sampling rate in 4-channel mode |
| Analog Input Range | 0 V to 5 V - ratiometric operation supported via differential VREF(+) and VREF(–) |
| Supply Voltage | 5 V ±5% - single-supply simplifies system power design and eliminates dual-rail requirements |
| Power Dissipation | 50 mW typical - low quiescent current supports embedded systems with thermal constraints |
| Slew Rate Support | 157 mV/µs - allows direct digitization of 10 kHz full-scale sinusoidal signals without external sample-and-hold |
Pinout & Package
AD7824KR-REEL is packaged in a 24-lead SOIC (R-24) surface-mount package, 15.6 mm × 7.6 mm body size, with standard 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN4 | Analog input channels | Four single-ended voltage inputs referenced to VREF(–); selected via A0/A1 address lines |
| A0, A1 | Multiplexer address inputs | Binary-select one of four analog channels (00=AIN1, 01=AIN2, 10=AIN3, 11=AIN4) |
| CS | Chip Select input | Active-low enable: initiates conversion when asserted with RD in Mode 0; latches address in Mode 1 |
| RD | Read input | Active-low control: triggers conversion start and enables data read from DB0–DB7 bus |
| RDY | Ready status output | Open-drain signal that goes high-impedance at end of conversion - used to drive µP WAIT input |
| INT | Interrupt output | Active-low pulse signaling completion of conversion; returns high on rising edge of CS or RD |
| DB0–DB7 | Parallel data outputs | Three-state 8-bit natural binary output bus; driven only after conversion completes and RD is active |
| VREF(+), VREF(–) | Differential reference inputs | Define full-scale range (e.g., 5 V span → 19.5 mV/LSB); support offset and ratiometric configurations |
| VDD, GND | Power supply terminals | Single 5 V supply with ground return; decoupling required per layout guidelines (47 µF + 0.1 µF) |
Key Features
| Feature | Design Value |
|---|---|
| Built-in track-and-hold | Enables accurate digitization of 10 kHz full-scale signals without external S/H circuitry |
| No external clock required | Half-flash architecture self-times conversion - reduces BOM count and layout complexity |
| Microprocessor-compatible interface | Standard CS/RD control and three-state data bus allow direct connection to Z80, MC68000, TMS32010 |
| Tight channel-to-channel matching | ±1/4 LSB max mismatch ensures consistent gain/offset across all four analog inputs |
| LC2MOS process technology | Ion-implanted CMOS delivers 40 mW typical power dissipation and industrial-grade reliability |
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 AD7828 - AD7824KR-REEL serves same role in 4-channel variants. IC Role / Device Role / Timing Role: Simultaneous digitization of up to four microphone or filter outputs with synchronized 2.5 µs conversions. Use Value: Eliminates need for external sample-and-hold and clock distribution, reducing latency and component count in portable voice processing units. |
Use Scenario: Monitoring temperature, pressure, and flow sensors in factory automation panels with limited PCB space. IC Role / Device Role / Timing Role: 4-channel analog front-end for microcontroller-based data loggers sampling at 10 kHz per channel. Use Value: Single-supply 5 V operation and ±1 LSB accuracy reduce calibration overhead and simplify power rail design in DIN-rail mounted controllers. |
| Medical Vital Signs Monitor | Automotive Diagnostic Interface |
Use Scenario: Acquisition of ECG, respiration, and SpO₂ analog waveforms in portable patient monitors. IC Role / Device Role / Timing Role: High-fidelity digitization of low-noise biopotential signals with inherent sample-and-hold behavior. Use Value: 157 mV/µs slew rate support captures transient physiological events without aliasing artifacts in battery-powered devices. |
Use Scenario: Reading analog sensor outputs (coolant temp, throttle position, O₂) in aftermarket vehicle diagnostic tools. IC Role / Device Role / Timing Role: Cost-optimized 4-channel ADC interfacing directly to 8-bit microcontrollers via simple memory-mapped I/O. Use Value: SOIC packaging and commercial temperature grade (0°C to 70°C) meet cost and form-factor targets for handheld scan tools. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel, 8-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7824LN | Same package (R-24), but ±1/2 LSB total unadjusted error vs. ±1 LSB for AD7824KR-REEL | Higher accuracy required in precision instrumentation where calibration headroom is limited | Select AD7824LN when tighter linearity and guaranteed no-missing-codes performance are mandatory |
| AD7824BR | Same pinout and function, but rated for –40°C to +85°C industrial temperature range vs. 0°C to 70°C | Deployment in non-climate-controlled environments such as motor control cabinets or outdoor telemetry nodes | Choose AD7824BR when extended temperature operation is required without redesigning layout or firmware |
Compared with AD7824LN and AD7824BR, the AD7824KR-REEL offers optimal balance of cost, commercial-grade reliability, and proven integration in Z80/MC68000-based systems - making it ideal for volume production of consumer and industrial data acquisition modules where ±1 LSB error is acceptable.
Availability
AD7824KR-REEL is available at Aetrix Electronics and suitable for real-time speech analysis, industrial sensor logging, medical vital signs monitoring, and automotive diagnostic interface applications requiring stable component supply and long-term sourcing continuity.
Supply support for AD7824KR-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, communications, and healthcare markets since 1965.
The AD7824KR-REEL belongs to Analog Devices' legacy LC2MOS high-speed ADC product line, designed specifically for microprocessor-centric data acquisition systems needing fast, low-power, and easy-to-interface multichannel conversion without external clocks or support components.
FAQ
What is the operating temperature range of the AD7824KR-REEL?
The AD7824KR-REEL is specified for commercial operation from 0°C to 70°C. This grade is validated per the K-version designation in Analog Devices' ordering guide and suits indoor, climate-controlled applications such as test equipment, consumer audio analyzers, and office-based data loggers. The AD7824KR-REEL does not support extended or industrial temperature ranges.
Does the AD7824KR-REEL require an external clock signal to operate?
No, the AD7824KR-REEL does not require an external clock. Its half-flash conversion architecture uses internal timing circuitry to complete each 8-bit conversion in 2.5 µs deterministically. This eliminates clock routing, jitter concerns, and external oscillator BOM cost - a key differentiator versus SAR or sigma-delta ADCs.
How is channel selection implemented on the AD7824KR-REEL?
Channel selection on the AD7824KR-REEL is performed using two address inputs: A0 and A1. These TTL-compatible digital inputs decode binary values to select among AIN1 (00), AIN2 (01), AIN3 (10), or AIN4 (11). Address validity must be maintained during CS and RD assertion in Mode 0, or latched on RD rising edge in Mode 1.
Can the AD7824KR-REEL interface directly with a Z80 microprocessor?
Yes, the AD7824KR-REEL is explicitly designed for Z80 compatibility in Mode 0 operation. When mapped to a memory address (e.g., C000h), a LD B,(C000) instruction asserts CS and RD, starts conversion, and halts the Z80 in WAIT state until RDY deasserts - placing the 8-bit result directly into register B without additional glue logic.
What reference configuration does the AD7824KR-REEL support?
The AD7824KR-REEL supports fully differential reference inputs (VREF(+) and VREF(–)), enabling unipolar (0 V to 5 V), bipolar (±4 V), or scaled ranges (e.g., 0 V to 2.5 V). Reference flexibility allows ratiometric measurements and input offset adjustment - critical for bridge sensor and transducer interfaces where excitation and measurement share a common source.
AD7824KR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 50k
- Number of Inputs:
- 4
- 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:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7824KR-REEL FAQ
1.How can I place an order for AD7824KR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7824KR-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 AD7824KR-REEL reliable?
The price and inventory of AD7824KR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7824KR-REEL is usually 5 days.
3.What payment methods are accepted for AD7824KR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7824KR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7824KR-REEL?
AD7824KR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7824KR-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 AD7824KR-REEL?
For technical support, including AD7824KR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7824KR-REEL requirements.
6.How does Aetrix verify that AD7824KR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7824KR-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 AD7824KR-REEL meets industry standards.
7.What is the process for return or replacement of AD7824KR-REEL?
All AD7824KR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7824KR-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 AD7824KR-REEL part is unused and in its original packaging.
Return procedure for AD7824KR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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