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Analog Devices Inc. AD7824KRZ
- Part No.:
- AD7824KRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7824KRZ.pdf
- Description:
- IC ADC 8BIT FLASH 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,819
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Product details
Overview
AD7824KRZ from Analog Devices is a 4-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, 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 for industrial process monitoring.
For engineers reviewing the AD7824KRZ datasheet, AD7824KRZ pinout, AD7824KRZ application, or AD7824KRZ equivalent, key selection criteria include channel count (4), conversion speed (2.5 µs), reference flexibility (differential VREF±), microprocessor interface simplicity (CS/RD only, no external clock), and commercial-grade temperature range (0°C to 70°C).
Technical Context
The AD7824KRZ 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 analog approximation before LSB conversion. This eliminates need for external clock generation and enables deterministic timing.
It operates in Mode 0 (WAIT-state microprocessor interface) or Mode 1 (non-WAIT), with address latching on A0/A1, RDY as open-drain ready signal, and INT as active-low completion flag. Input tracking duration is ~1 µs, supporting full-scale 10 kHz sinusoidal signals (157 mV/µs slew rate) without external sample-and-hold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete digital codes over full-scale input range |
| Total Unadjusted Error | ±1 LSB max - includes offset, full-scale, and linearity errors; no user trimming required |
| Conversion Time | 2.5 µs per channel - enables 100 kHz per-channel sampling rate in 4-channel configuration |
| Analog Input Range | 0 V to 5 V (unipolar) - set by differential VREF(+) and VREF(–); supports ratiometric measurement |
| Supply Voltage | 5 V ±5% - single-supply operation simplifies power design and eliminates dual-rail requirements |
| Power Dissipation | 50 mW typical - low quiescent current (16 mA max IDD) enables use in thermally constrained systems |
| Channel-to-Channel Mismatch | ±0.25 LSB max - ensures consistent gain/offset across all four analog inputs for multichannel coherence |
Pinout & Package
AD7824KRZ is packaged in a 24-lead SOIC (R-24) surface-mount package, 15.6 mm × 7.6 mm × 2.35 mm body size, with standard gull-wing lead form and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN4 | Analog input channels | Multiplexed single-ended inputs; selected via A0/A1; support 0–5 V unipolar or bipolar-configured signals |
| A0, A1 | Multiplexer address inputs | Binary-encoded channel selection (00=AIN1, 01=AIN2, 10=AIN3, 11=AIN4); 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; controls device enable in Mode 1 |
| RD | Read input | Active-low control; triggers conversion start and data read; latches address in Mode 1 |
| RDY | Ready status output | Open-drain, active-low signal indicating conversion completion; requires external pull-up in Mode 0 |
| INT | Interrupt output | Active-low pulse signaling end of conversion; returns high on CS or RD rising edge |
| DB0–DB7 | Three-state data outputs | 8-bit parallel natural binary output; tri-stated until conversion completes; compatible with 5 V TTL/CMOS logic |
| VREF(+), VREF(–) | Differential reference inputs | Define full-scale range (VREF(+) – VREF(–)); support offset and scaled ranges (e.g., 2 V span = 7.8 mV/LSB) |
| 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 function | Enables accurate digitization of 10 kHz full-scale signals without external S/H circuitry, reducing BOM and layout complexity |
| No external clock required | Half-flash architecture self-times conversion, eliminating clock routing, jitter concerns, and associated PCB noise coupling |
| Differential reference interface | Allows flexible input scaling and offset (e.g., ±4 V bipolar via op-amp conditioning) while maintaining ratiometric accuracy |
| Tight channel-to-channel matching | ±0.25 LSB mismatch ensures minimal gain/offset variation across AIN1–AIN4, critical for synchronized multichannel acquisition |
| Microprocessor-compatible interface | Standard CS/RD control with WAIT-state (Mode 0) or non-WAIT (Mode 1) support simplifies integration with Z80, MC68000, TMS32010, and similar controllers |
Applications
| Industrial Process Monitoring | Real-Time Speech Analysis |
|---|---|
|
Use Scenario: Continuous acquisition of temperature, pressure, and flow sensor outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: 4-channel ADC capturing synchronized analog measurements at ≤100 kHz aggregate rate with deterministic 2.5 µs latency per channel. Use Value: Eliminates need for external sample-and-hold and clock generator, reducing component count and improving thermal stability in enclosed enclosures. |
Use Scenario: Simultaneous digitization of eight filtered speech bands (e.g., band-pass filters 1–8) in voice codec hardware. IC Role / Device Role / Timing Role: One AD7824KRZ per four-band group; paired AD7824KRZ units handle eight channels with interleaved addressing and shared RD/CS control. Use Value: Enables real-time spectral analysis with <1 µs input tracking window, preserving transient fidelity in voiced/unvoiced speech transitions. |
| Embedded Data Logger | Test & Measurement Front-End |
|
Use Scenario: Battery-powered field logger recording environmental sensor data (light, humidity, voltage) over extended periods. IC Role / Device Role / Timing Role: Low-power 8-bit ADC operating from single 5 V rail; enters low-current state between conversions to minimize average dissipation. Use Value: 50 mW typical power enables >12-month operation on AA alkaline cells when sampling at 10 Hz with duty-cycled CS activation. |
Use Scenario: Modular benchtop instrument front-end acquiring analog waveforms prior to FPGA-based FFT processing. IC Role / Device Role / Timing Role: High-speed ADC interfaced directly to microcontroller GPIO bus; RDY signal synchronizes DMA transfers to SRAM buffer. Use Value: 2.5 µs conversion + 85 ns data access time allows sustained 390 kSPS throughput using burst-mode CPU reads, minimizing bus contention. |
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), same pinout, but ±1/2 LSB total unadjusted error vs. ±1 LSB for AD7824KRZ | Higher accuracy required in precision sensor calibration or metrology-grade logging | Select AD7824LN when tighter linearity and lower missing-code risk justify cost premium over KRZ grade |
| MAX1136CPE+ | 8-channel 8-bit ADC in 28-pin PDIP; requires external clock; 3.5 µs conversion time; ±1 LSB error | Systems needing ≥8 channels or through-hole assembly; less suitable for space-constrained SOIC layouts | Choose MAX1136CPE+ only if channel expansion beyond four is required and board area permits larger DIP footprint |
Compared with AD7824LN, AD7824KRZ trades 0.5 LSB accuracy for lower cost and broader availability; compared with MAX1136CPE+, AD7824KRZ offers faster conversion, no-clock operation, and compact SOIC packaging-critical for high-density embedded designs.
Availability
AD7824KRZ is available at Aetrix Electronics and suitable for industrial process monitoring, embedded data loggers, real-time speech analysis, and test & measurement front-end applications requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for AD7824KRZ 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 AD7824KRZ belongs to Analog Devices' legacy LC2MOS data acquisition IC family, designed specifically for cost-sensitive, microprocessor-integrated multichannel ADC systems requiring fast, self-timed conversion without external clocks or sample-and-hold circuits.
FAQ
What is the operating temperature range for the AD7824KRZ?
The AD7824KRZ is rated for commercial operation from 0°C to +70°C. This range is confirmed in the Ordering Guide section of the datasheet, where "KR" suffix denotes the K-grade temperature specification. It is not rated for industrial (–40°C to +85°C) or extended (–55°C to +125°C) temperature ranges; those require B/C/T/U variants such as AD7824BQ or AD7824TQ.
Does the AD7824KRZ require an external clock signal to operate?
No, the AD7824KRZ does not require an external clock signal. Its half-flash conversion architecture uses internal timing circuitry triggered solely by CS and RD control signals. The datasheet explicitly states "No clock signal is required for the ADC" and confirms this in both the FEATURES and TIMING AND CONTROL sections, making it simpler to integrate than SAR or sigma-delta ADCs requiring clock distribution.
Can the AD7824KRZ perform bipolar input measurements?
Yes, the AD7824KRZ supports bipolar operation via external signal conditioning. Using an op-amp like the AD544 (as shown in Figure 12 of the datasheet), the input can be level-shifted and scaled-for example, to accept ±4 V inputs. The differential VREF(+) and VREF(–) inputs enable ratiometric referencing, and the output uses complementary offset binary coding in bipolar mode, as verified in the BIPOLAR OPERATION section.
What package type is used for the AD7824KRZ?
The AD7824KRZ uses a 24-lead SOIC (Small Outline Integrated Circuit) package, designated R-24 in the Ordering Guide. Its dimensions are 15.6 mm × 7.6 mm × 2.35 mm with 1.27 mm lead pitch. This surface-mount package is distinct from the PDIP (N-24) and PLCC variants offered for other AD7824 grades, and is confirmed in the "Package Option" column for model AD7824KR in the datasheet's Ordering Guide table.
How does the RDY pin function on the AD7824KRZ?
The RDY pin on the AD7824KRZ is an open-drain, active-low status output. In Mode 0, it pulls low at CS falling edge and returns to high-impedance when conversion completes and valid data appears on DB0–DB7. An external pull-up resistor is required for proper logic-level signaling. In Mode 1, RDY provides no status and must be tied to GND, as stated in the MODE 1 section of the datasheet.
AD7824KRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- -
AD7824KRZ FAQ
1.How can I place an order for AD7824KRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7824KRZ 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 AD7824KRZ reliable?
The price and inventory of AD7824KRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7824KRZ is usually 5 days.
3.What payment methods are accepted for AD7824KRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7824KRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7824KRZ?
AD7824KRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7824KRZ 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 AD7824KRZ?
For technical support, including AD7824KRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7824KRZ requirements.
6.How does Aetrix verify that AD7824KRZ is sourced from the original manufacturer or authorized distributors?
All AD7824KRZ 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 AD7824KRZ meets industry standards.
7.What is the process for return or replacement of AD7824KRZ?
All AD7824KRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7824KRZ, 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 AD7824KRZ part is unused and in its original packaging.
Return procedure for AD7824KRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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