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Analog Devices Inc. AD7828TQ
- Part No.:
- AD7828TQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD7828TQ.pdf
- Description:
- 8-BIT FLASH ADC, 8 CHANNEL
- Quantity:
- Payment:
- Shipping:
Inventory:2,241
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Product details
Overview
AD7828TQ from Analog Devices is an 8-channel, 8-bit LC2MOS successive-approximation analog-to-digital converter with built-in track/hold, single 5 V supply operation, ±1 LSB total unadjusted error, and 2.5 µs per-channel conversion time. It digitizes full-scale 10 kHz sinusoidal signals (157 mV/µs slew rate) across all eight inputs without external sample-and-hold circuitry, targeting real-time data acquisition in rugged industrial control systems.
For engineers reviewing the AD7828TQ datasheet, AD7828TQ pinout, AD7828TQ application, or AD7828TQ equivalent, key selection considerations include its extended temperature range (–55°C to +125°C), Q-28 ceramic DIP package, differential reference input flexibility (0 V to 5 V span), and Mode 0/Mode 1 microprocessor interface compatibility with Z80, MC68000, and TMS32010 architectures.
Technical Context
The AD7828TQ 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 generating the analog residue for LSB conversion. This eliminates the need for an external clock signal and enables deterministic timing via CS/RD control only.
Its analog input structure inherently provides sample-and-hold functionality: the selected channel is tracked for ~1 µs after conversion start, and the value at that instant determines the final 8-bit result. Input leakage is ±3 µA max, and input capacitance is 45 pF, requiring source impedance ≤100 Ω for full accuracy.
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 (Mode 0) - sets maximum per-channel sampling rate at 50 kHz for AD7828 |
| Analog Input Bandwidth | 10 kHz full-scale - supports direct digitization of 10 kHz sine waves without external S/H |
| Supply Voltage | 5 V ±5% - single-supply operation simplifies power design; IDD = 16 mA max at TMIN/TMAX |
| Reference Input Range | VREF(–) to VREF(+) - fully differential; supports ratiometric measurement and offset input spans |
| Operating Temperature | –55°C to +125°C - qualified for extended military/aerospace environments per /883B processing |
Pinout & Package
AD7828TQ is supplied in a 28-lead hermetic Cerdip (Q-28) package with 0.6" wide DIP footprint, glass-sealed ceramic body, and tin/lead-plated leads compliant with MIL-M-38510. Pin 1 is identified by dot or notch; leads are center-aligned with 0.100" pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN8 | Analog input channels | Eight single-ended inputs; multiplexed under A2/A1/A0 address control; each accepts 0 V to 5 V referenced to VREF(–) |
| A0, A1, A2 | Multiplexer address inputs | 3-bit binary select for channel; A2 is AD7828-only; latched on rising edge of RD in Mode 1 |
| CS | Chip Select | Active-low enable; initiates conversion when pulled low with RD in Mode 0; controls latch timing in Mode 1 |
| RD | Read strobe | Active-low control; triggers conversion start (Mode 0) or latches address and reads prior result (Mode 1) |
| RDY | Ready indicator | Open-drain output; goes high-impedance at end of conversion to signal data validity on DB0–DB7 |
| INT | Interrupt output | Active-low; asserts at conversion completion; returns high on rising edge of CS or RD |
| DB0–DB7 | Three-state data outputs | 8-bit parallel natural binary output; driven only after conversion completes; compatible with TTL/CMOS logic |
| VREF(+), VREF(–) | Differential reference inputs | Define zero-to-full-scale range; support ratiometric sensing and programmable span (e.g., 2.5 V ref → 9.77 mV/LSB) |
| VDD, GND | Power supply | Single 5 V supply; 450 mW max power dissipation at 75°C; derates 6 mW/°C above 75°C |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel multiplexed input | Reduces board space and component count vs. discrete single-channel ADCs; eliminates external MUX IC |
| Built-in track/hold function | Enables accurate digitization of 10 kHz full-scale signals without external S/H circuitry or layout complexity |
| No external clock required | Half-flash architecture uses only CS/RD timing - simplifies system timing design and reduces EMI sources |
| Tight channel-to-channel matching | ±1/4 LSB max mismatch ensures consistent gain/offset across all 8 channels for multi-sensor synchronization |
| Extended temperature qualification | –55°C to +125°C operation with /883B processing supports aerospace, downhole, and engine-control applications |
Applications
| Motor Control Feedback | Avionics Sensor Interface |
|---|---|
|
Use Scenario: Real-time acquisition of eight analog feedback signals (phase currents, rotor position, temperature, voltage) from brushless DC motor drives operating in harsh thermal environments. IC Role / Device Role / Timing Role: 8-channel simultaneous-sampling-capable ADC providing synchronized digitization of critical motor parameters with 2.5 µs per-channel latency. Use Value: Enables closed-loop field-oriented control (FOC) at >20 kHz PWM frequencies without external sample-and-hold, reducing BOM and PCB area by 30% vs. discrete solutions. |
Use Scenario: Digitizing analog outputs from inertial measurement units (IMUs), pressure transducers, and fuel-level sensors in flight control computers exposed to –55°C cold-soak and +125°C engine-bay temperatures. IC Role / Device Role / Timing Role: High-reliability ADC with /883B-qualified Q-28 package serving as primary data acquisition front-end in DO-254-compliant avionics hardware. Use Value: Guaranteed operation across full military temperature range eliminates need for heater-cooler subsystems, lowering system power and weight. |
| Industrial PLC I/O Module | Test & Measurement Equipment |
|
Use Scenario: Modular analog input card in programmable logic controllers handling eight 4–20 mA current-loop or 0–10 V sensor inputs in factory automation cabinets with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Precision ADC with ±1 LSB error and ratiometric reference capability ensuring traceable calibration across varying supply and reference conditions. Use Value: Differential VREF(±) inputs allow direct connection to isolated current-loop receivers, eliminating level-shifting op amps and improving noise immunity. |
Use Scenario: Embedded digitizer in portable oscilloscopes and spectrum analyzers requiring multichannel acquisition with minimal latency and deterministic timing for trigger correlation. IC Role / Device Role / Timing Role: Microprocessor-compatible ADC interfaced to Z80 or TMS32010 via Mode 0 WAIT-state or Mode 1 dual-read protocol for precise timestamp alignment. Use Value: RDY and INT status outputs enable cycle-accurate synchronization with CPU instruction execution, supporting sub-microsecond trigger jitter budgets. |
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 |
|---|---|---|---|
| AD7828CQ | Same architecture and pinout; rated for –40°C to +85°C (industrial grade); ±1/2 LSB error option available | Suitable for commercial/industrial environments without extreme thermal stress; lower cost than T-grade | Select AD7828CQ when operating temperature stays above –40°C and tighter accuracy (±1/2 LSB) is required |
| ADS7822U | 12-bit SAR ADC; SPI interface; 200 kSPS; single 3 V or 5 V supply; no built-in track/hold; requires external clock | Higher resolution but serial interface increases CPU overhead; lacks inherent S/H for >10 kHz signals | Choose ADS7822U only if 12-bit resolution is mandatory and system can accommodate external S/H + clock generation |
Compared with AD7828CQ, AD7828TQ trades ±1/2 LSB accuracy for guaranteed –55°C to +125°C operation and hermetic packaging; versus ADS7822U, it offers deterministic parallel interface timing and integrated track/hold at the cost of resolution and serial bus simplicity.
Availability
AD7828TQ 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 AD7828TQ 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, founded in 1965 and headquartered in Wilmington, MA.
The AD7828TQ belongs to Analog Devices' legacy LC2MOS precision data acquisition family, designed specifically for high-speed, multichannel, microprocessor-compatible ADC applications in demanding industrial, military, and aerospace environments.
FAQ
What is the operating temperature range of the AD7828TQ?
The AD7828TQ is rated for operation from –55°C to +125°C and is processed to MIL-STD-883 Class B requirements. This extended range is achieved through hermetic Q-28 Cerdip packaging and rigorous screening, making AD7828TQ suitable for downhole tools, jet engine controls, and space-qualified subsystems where ambient extremes exceed commercial or industrial grade limits.
Does the AD7828TQ require an external clock signal?
No, the AD7828TQ does not require an external clock signal. Its half-flash conversion architecture uses only the CS and RD control lines to initiate and time conversions. The internal timing is self-contained, eliminating clock distribution, jitter concerns, and associated layout complexity - a key advantage over SAR or sigma-delta ADCs requiring external clocks.
How does the AD7828TQ handle analog input signals above 10 kHz?
The AD7828TQ's built-in track/hold function guarantees accurate digitization only for full-scale signals up to 10 kHz (157 mV/µs slew rate). For higher-frequency inputs, an external sample-and-hold amplifier must be used ahead of the ADC input to freeze the signal during conversion. The AD7828TQ itself does not perform anti-aliasing filtering - that remains the responsibility of external passive or active filters.
Can the AD7828TQ operate with a reference voltage less than 5 V?
Yes, the AD7828TQ supports fully differential reference inputs (VREF(+) and VREF(–)), allowing any reference span from 0 V up to VDD. Using a 2.5 V reference, for example, yields 9.77 mV/LSB resolution instead of 19.5 mV/LSB at 5 V - increasing sensitivity for low-amplitude signals while maintaining the same ±1 LSB error specification relative to the chosen full-scale range.
What microprocessor interfaces are supported by the AD7828TQ?
The AD7828TQ supports both Mode 0 (WAIT-state) and Mode 1 (non-WAIT) microprocessor interfaces. It has been validated with Z80 (using RDY to assert WAIT), MC68000 (using INT to assert DTACK), and TMS32010 (using dual-read protocol). Address decoding is handled externally; the device appears as memory-mapped or port-mapped peripheral depending on system architecture.
AD7828TQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-CDIP (0.600", 15.24mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- -
- 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:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 4.75V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -55°C ~ 125°C
- Supplier Device Package:
- 28-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7828TQ FAQ
1.How can I place an order for AD7828TQ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7828TQ 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 AD7828TQ reliable?
The price and inventory of AD7828TQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7828TQ is usually 5 days.
3.What payment methods are accepted for AD7828TQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7828TQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7828TQ?
AD7828TQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7828TQ 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 AD7828TQ?
For technical support, including AD7828TQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7828TQ requirements.
6.How does Aetrix verify that AD7828TQ is sourced from the original manufacturer or authorized distributors?
All AD7828TQ 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 AD7828TQ meets industry standards.
7.What is the process for return or replacement of AD7828TQ?
All AD7828TQ units undergo pre-shipment inspection (PSI). If there is an issue with AD7828TQ, 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 AD7828TQ part is unused and in its original packaging.
Return procedure for AD7828TQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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