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Analog Devices Inc. AD7824UQ
- Part No.:
- AD7824UQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD7824UQ.pdf
- Description:
- IC ADC 8BIT FLASH 24CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,661
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Product details
Overview
AD7824UQ 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, ±1/2 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 qualified for extended temperature operation from –55°C to +125°C.
For engineers reviewing the AD7824UQ datasheet, AD7824UQ pinout, AD7824UQ application, or AD7824UQ equivalent, this page delivers verified specifications, validated pin functions, confirmed military-grade thermal performance, and real-world interface timing for Z80, MC68000, and TMS32010 microprocessor systems.
Technical Context
The AD7824UQ uses a half-flash architecture with two 4-bit flash ADCs - one for MSBs and one for LSBs - eliminating external clock requirements and enabling deterministic 2.5 µs conversion per channel. Its internal DAC reconstructs the MSB voltage for subtraction before LSB conversion.
It supports two microprocessor interface modes: Mode 0 (WAIT-state driven, RDY/INT status signaling) and Mode 1 (non-WAIT, pipelined read of prior result). Address latching occurs on rising RD edge in Mode 1, with 2.5 µs minimum inter-conversion delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete digital output codes over full-scale range |
| Total Unadjusted Error | ±1/2 LSB max - guarantees monotonicity and no missing codes without user trimming |
| Conversion Time | 2.5 µs per channel - enables 100 kHz per-channel sampling rate in 4-channel system |
| Analog Input Bandwidth | 10 kHz - supports full-scale sinusoidal signals up to 157 mV/µs slew rate without external sample-and-hold |
| Supply Voltage | 5 V ±5% - single-supply operation simplifies power design and eliminates dual-rail requirements |
| Power Dissipation | 50 mW typ - low active power enables use in thermally constrained embedded systems |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial and aerospace environments |
Pinout & Package
AD7824UQ is supplied in a 24-lead hermetically sealed ceramic DIP (Q-24) package, compliant with MIL-STD-883 and suitable for high-reliability applications requiring extended temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN4 | Analog input channels | Four single-ended inputs accepting 0 V to 5 V; selected via A0/A1 address lines |
| A0, A1 | Multiplexer address inputs | Binary-selects active analog channel (00 = AIN1, 01 = AIN2, 10 = AIN3, 11 = AIN4) |
| 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 conversion and data read in Mode 0 |
| RDY | Ready status output | Open-drain signal indicating conversion completion; requires external pull-up in Mode 0 |
| INT | Interrupt output | Active-low pulse signaling end of conversion; resets on rising edge of CS or RD |
| DB0–DB7 | Digital data outputs | Three-state, 8-bit parallel bus delivering natural binary code; compatible with TTL/CMOS logic |
| 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 with ground reference; decoupling required at VDD pin per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Built-in track-and-hold function | Eliminates need for external S/H circuitry when digitizing 10 kHz full-scale signals |
| No external clock required | Half-flash architecture self-times conversion, reducing system component count and layout complexity |
| Tight channel-to-channel matching | ±1/4 LSB max mismatch enables accurate relative measurements across all four channels |
| Two flexible interface modes | Mode 0 supports WAIT-state microprocessors (Z80, MC68000); Mode 1 supports non-WAIT architectures (TMS32010) |
| Full differential reference capability | VREF(+) and VREF(–) allow programmable input span and offset, enabling bipolar ±4 V operation with external op amp |
Applications
| Motor Control Feedback | Avionics Sensor Interface |
|---|---|
|
Use Scenario: Real-time acquisition of four analog feedback signals (phase currents, rotor position, temperature, DC link voltage) in brushless DC motor drives. IC Role / Device Role / Timing Role: Simultaneous 4-channel sampling with 2.5 µs conversion ensures synchronized capture of dynamic motor states. Use Value: Enables closed-loop commutation at >10 kHz update rates without external sample-and-hold, reducing BOM and PCB area. |
Use Scenario: Digitizing transducer outputs (pressure, acceleration, vibration) in flight data recorders operating across –55°C to +125°C. IC Role / Device Role / Timing Role: High-reliability ADC with MIL-qualified Q-24 ceramic package and extended temperature rating. Use Value: Eliminates need for thermal derating or external conditioning in harsh environmental chambers and airborne enclosures. |
| Industrial PLC I/O Module | Test Equipment Signal Acquisition |
|
Use Scenario: 4-channel analog input card in programmable logic controllers monitoring process variables (flow, level, pH, conductivity). IC Role / Device Role / Timing Role: Direct interface to Z80 or 80C86-based controller buses using Mode 0 with RDY-driven WAIT states. Use Value: Simplifies firmware integration with standard memory-mapped I/O addressing (e.g., C000–C003) and eliminates custom timing logic. |
Use Scenario: Embedded digitizer in automated test equipment capturing transient waveforms from multiple sensors during functional validation. IC Role / Device Role / Timing Role: Pipelined Mode 1 operation allows continuous acquisition with minimal CPU overhead on TMS32010 DSP platforms. Use Value: Achieves sustained 100 kHz effective sampling across four channels while maintaining deterministic 2.5 µs inter-conversion spacing. |
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 |
|---|---|---|---|
| AD7824CQ | Same pinout and architecture, but rated for –40°C to +85°C only; ±1/2 LSB error spec identical | Lacks extended temperature qualification; unsuitable for aerospace or downhole applications | Select AD7824CQ only if operating environment stays within industrial temperature range and cost is prioritized |
| MAX118ACPP | 8-channel, 8-bit SAR ADC with SPI interface; no built-in track-and-hold; requires external clock | Higher channel count but serial interface increases firmware complexity and reduces throughput per channel | Choose MAX118ACPP only when board space is constrained and SPI compatibility outweighs parallel bus simplicity |
Compared with AD7824CQ, AD7824UQ provides guaranteed operation at –55°C and +125°C without derating, while compared with MAX118ACPP, it delivers deterministic parallel read timing, integrated track-and-hold, and zero-clock-system simplicity - critical for deterministic real-time control loops.
Availability
AD7824UQ is available at Aetrix Electronics and suitable for motor control feedback, avionics sensor interface, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7824UQ 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 precision instrumentation, industrial automation, and defense markets since 1965.
The AD7824UQ belongs to the AD7824/AD7828 family of high-speed multichannel ADCs designed specifically for real-time data acquisition in microprocessor-based control systems where speed, accuracy, and interface simplicity are critical.
FAQ
What is the maximum analog input frequency supported by the AD7824UQ without external sample-and-hold?
The AD7824UQ supports full-scale analog input frequencies up to 10 kHz without external sample-and-hold, enabled by its inherent track-and-hold function and 157 mV/µs slew rate capability. This is confirmed in the datasheet's "SINUSOIDAL INPUTS" section and validated by TPC 3 (Signal-to-Noise Ratio vs. Input Frequency), which shows maintained SNR up to 10 kHz under 400 kHz encode rate conditions. The AD7824UQ achieves this through simultaneous comparator tracking for ~1 µs after conversion start.
Does the AD7824UQ require an external clock signal to operate?
No, the AD7824UQ does not require an external clock signal. Its half-flash conversion architecture uses internal timing circuitry to complete each 8-bit conversion in 2.5 µs deterministically. This eliminates clock distribution, jitter concerns, and external oscillator components - a key differentiator from SAR or sigma-delta ADCs. The timing diagrams in Figures 14 and 15 confirm that only CS and RD control sequencing.
How does the AD7824UQ handle reference voltage configuration for bipolar input ranges?
The AD7824UQ supports bipolar operation via its fully differential VREF(+) and VREF(–) inputs. When used with an external op amp like the AD544 (as shown in Figure 12), it accepts ±4 V inputs and produces complementary offset binary output. The VREF(–) pin sets the zero-code point, allowing offset adjustment independent of VREF(+); this enables ratiometric measurement and flexible span scaling without modifying the ADC core.
What microprocessor interface modes does the AD7824UQ support, and how do they differ?
The AD7824UQ supports two distinct interface modes: Mode 0 (WAIT-state driven, using RDY/INT for synchronization) and Mode 1 (non-WAIT, pipelined read of prior result). In Mode 0, a single CS+RD assertion starts conversion and returns fresh data; in Mode 1, the first read returns previous data and starts new conversion, requiring a second read for updated result. Timing parameters tCRD (2.5 µs) and tP (600 ns min) govern inter-conversion spacing in both modes.
Is the AD7824UQ pin-compatible with other variants in the AD7824/AD7828 family?
Yes, the AD7824UQ is pin-compatible with all AD7824 variants in the Q-24 ceramic DIP package, including AD7824BQ, AD7824CQ, and AD7824TQ. Pin functions, electrical characteristics, and timing behavior are identical across these versions; only temperature range and total unadjusted error grade differ. This allows drop-in replacement in existing designs when upgrading to extended temperature or tighter accuracy specs.
AD7824UQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- -55°C ~ 125°C
- Supplier Device Package:
- 24-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7824UQ FAQ
1.How can I place an order for AD7824UQ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7824UQ 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 AD7824UQ reliable?
The price and inventory of AD7824UQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7824UQ is usually 5 days.
3.What payment methods are accepted for AD7824UQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7824UQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7824UQ?
AD7824UQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7824UQ 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 AD7824UQ?
For technical support, including AD7824UQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7824UQ requirements.
6.How does Aetrix verify that AD7824UQ is sourced from the original manufacturer or authorized distributors?
All AD7824UQ 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 AD7824UQ meets industry standards.
7.What is the process for return or replacement of AD7824UQ?
All AD7824UQ units undergo pre-shipment inspection (PSI). If there is an issue with AD7824UQ, 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 AD7824UQ part is unused and in its original packaging.
Return procedure for AD7824UQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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