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Analog Devices Inc. AD7528TQ
- Part No.:
- AD7528TQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD7528TQ.pdf
- Description:
- IC DAC 8BIT A-OUT 20CDIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AD7528TQ from Analog Devices is a monolithic dual 8-bit buffered multiplying DAC with matched DAC-to-DAC performance (±0.5 LSB relative accuracy, ±2 LSB gain error), four-quadrant multiplication capability, and operation from +5 V to +15 V. It features separate on-chip latches for each DAC, TTL/CMOS-compatible 8-bit data inputs, and independent reference inputs (VREFA/VREFB) and feedback resistors (RFB A/RFB B), enabling precision stereo audio attenuation and programmable filter coefficient control in harsh-temperature environments.
For engineers reviewing the AD7528TQ datasheet, AD7528TQ pinout, AD7528TQ application, or AD7528TQ equivalent, key selection considerations include its extended temperature range (–55°C to +125°C), cerdip Q-20 package, dual DAC channel isolation (–77 dB), low digital-to-analog glitch impulse (160 nV·s typ), and compatibility with 8-bit microprocessors including 6800 and 8085.
Technical Context
The AD7528TQ integrates two identical current-steering R-2R ladder DACs fabricated simultaneously on a single die, ensuring inherent tracking and matching across temperature. Each DAC accepts an 8-bit unipolar or bipolar (offset binary) code and multiplies it by its respective reference voltage, supporting both 2-quadrant (unipolar) and 4-quadrant (bipolar) operation via external op-amp configuration.
Its digital interface uses shared DB0–DB7 lines with dedicated DAC A/DAC B select, CS, and WR signals-enabling bus-compatible write cycles analogous to RAM access. The device exhibits low power dissipation (2 mA max IDD), high channel-to-channel isolation (–77 dB), and minimal output leakage (±50 nA max at 25°C), making it suitable for precision analog signal synthesis where crosstalk and thermal drift must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - defines 256 discrete output steps per DAC channel |
| Relative Accuracy | ±1/2 LSB max - ensures endpoint linearity within 0.2% of full scale over –55°C to +125°C |
| Gain Error | ±2 LSB max - calibrated full-scale deviation, adjustable to zero using external trim resistors |
| Differential Nonlinearity | ±1 LSB max - guarantees monotonic output across entire temperature range |
| Current Settling Time | 180 ns max (VDD = +15 V) - time to settle within 1/2 LSB after code change, critical for high-speed waveform generation |
| Channel-to-Channel Isolation | –77 dB typ - suppresses coupling between DAC A and DAC B outputs, essential for independent dual-channel control |
| Glitch Impulse | 160 nV·s typ - low charge injection during code transitions minimizes transient errors in sensitive analog paths |
Pinout & Package
The AD7528TQ is housed in a 20-lead cerdip (Q-20) package with side-brazed ceramic construction, rated for –55°C to +125°C operation and marked with "Q" designation per Analog Devices' ordering guide.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AGND) | Analog Ground | Reference return for both DAC outputs and reference inputs; must be tied to DGND at device for noise control |
| 2 (OUT A) | DAC A Current Output | Unbuffered current sink output; requires external op-amp for voltage conversion and gain setting |
| 3 (RFB A) | DAC A Feedback Resistor Terminal | Connects to op-amp inverting input to configure transimpedance gain; sets full-scale output voltage |
| 4 (VREFA) | DAC A Reference Input | Accepts ±25 V input; determines scaling factor for DAC A output; matched to VREFB within ±1% |
| 5 (DGND) | Digital Ground | Return for digital control logic; separation from AGND requires careful PCB layout to avoid ground bounce |
| 6 (DAC A/DAC B) | DAC Selection Control | Low = load DAC A, High = load DAC B; enables dual-latch operation from common data bus |
| 7 (DB7) | Data Bus MSB | Most significant bit of 8-bit parallel input; TTL/CMOS compatible with VIH ≥ 2.4 V (VDD = +5 V) |
| 8 (DB6) | Data Bus Bit 6 | Part of shared 8-bit data path (DB0–DB7); latched into selected DAC on CS/WR active cycle |
| 9 (DB5) | Data Bus Bit 5 | Same timing and interface behavior as DB6; no internal buffering between data pins |
| 10 (DB4) | Data Bus Bit 4 | Valid during write setup/hold windows (tDS ≥ 30 ns, tDH = 0 ns at VDD = +15 V) |
| 11 (DB3) | Data Bus Bit 3 | Driven by microprocessor data bus; input capacitance ≤ 10 pF minimizes loading on driving source |
| 12 (DB2) | Data Bus Bit 2 | Compatible with 6800/8085 bus timing; supports direct interface without external latch |
| 13 (DB1) | Data Bus Bit 1 | Input leakage ≤ ±1 µA ensures low power consumption and stable logic levels |
| 14 (DB0) | Data Bus LSB | Least significant bit; combined with DB7–DB1 forms complete 8-bit word loaded into selected DAC latch |
| 15 (CS) | Chip Select | Active-low enable; must be low before WR pulse for valid write cycle (tCS ≥ 60 ns setup) |
| 16 (WR) | Write Strobe | Active-low latch control; initiates data transfer into selected DAC latch when CS is low |
| 17 (VDD) | Positive Supply | +5 V to +15 V operation; IDD ≤ 2 mA at +25°C; decoupling required near pin for dynamic stability |
| 18 (VREFB) | DAC B Reference Input | Independent reference input for DAC B; matches VREFA impedance and TC (–300 ppm/°C) |
| 19 (RFB B) | DAC B Feedback Resistor Terminal | Identical function to RFB A; allows independent gain setting for DAC B channel |
| 20 (OUT B) | DAC B Current Output | Second independent current output; electrically isolated from OUT A with –77 dB typical crosstalk |
Key Features
| Feature | Design Value |
|---|---|
| Dual on-chip latches | Enables independent loading of DAC A and DAC B via shared 8-bit bus and DAC A/B select line |
| Four-quadrant multiplication | Supports bipolar (offset binary) coding and external op-amp configurations for true 4Q gain control |
| DAC-to-DAC matching | ±0.5 LSB relative accuracy and matched input resistance (±1% VREFA/VREFB) ensure consistent channel response |
| Extended temperature grade | Specified for –55°C to +125°C operation (T-grade), validated for aerospace and downhole industrial use |
| Low-glitch architecture | 160 nV·s typical glitch impulse reduces transient artifacts in audio and control loop applications |
Applications
| Stereo Audio Gain Control | Programmable Filter Coefficient Tuning |
|---|---|
Use Scenario: Simultaneous left/right channel volume adjustment in professional audio equipment operating across military temperature ranges. IC Role / Device Role / Timing Role: Dual DAC providing independent, matched attenuation control for two analog signal paths using unipolar 8-bit codes. Use Value: ±0.5 LSB matching ensures identical gain step resolution between channels, eliminating stereo image shift during level changes. | Use Scenario: Real-time adjustment of cutoff frequency and Q-factor in a digitally controlled state-variable filter for communications receivers. IC Role / Device Role / Timing Role: Two AD7528TQ DACs jointly set resistor ratios in analog filter topology via 4-quadrant multiplication mode. Use Value: –77 dB channel isolation prevents interaction between frequency and Q control paths, preserving filter shape fidelity. |
| Dual-Channel Programmable Attenuator | Digitally Controlled Window Comparator |
Use Scenario: Precision dual-path signal level management in telecom line cards requiring 0–15.5 dB attenuation with 0.5 dB step resolution. IC Role / Device Role / Timing Role: Each DAC functions as a digitally programmable current-controlled attenuator using voltage-switching configuration. Use Value: 180 ns settling time enables rapid reconfiguration (<5.5 µs for full 0–255 code sweep), supporting adaptive signal conditioning. | Use Scenario: Pass/fail testing of sensor outputs against programmable upper and lower thresholds in engine control units. IC Role / Device Role / Timing Role: DAC A and DAC B generate precise reference voltages for dual comparators defining window boundaries. Use Value: ±2 LSB gain error tolerance allows accurate threshold setting within ±0.8% of full-scale reference, meeting automotive ASIL-B requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7528UQ | Higher grade: ±1/2 LSB relative accuracy, ±1 LSB gain error vs. AD7528TQ's ±2 LSB | Used where tighter full-scale calibration is required, e.g., metrology-grade instrumentation | Select AD7528UQ only if system-level gain error budget demands <±0.4% full-scale deviation |
| AD7528SQ | Same temperature range (–55°C to +125°C) but looser accuracy: ±1 LSB relative, ±4 LSB gain error | Suitable for cost-sensitive industrial controls where ±1.6% full-scale error is acceptable | Choose AD7528SQ when extended temp operation is needed but highest linearity is not critical |
Compared with AD7528UQ, AD7528TQ trades 1 LSB of gain error tolerance for broader availability and lower unit cost, while AD7528SQ offers identical rugged packaging at reduced precision-making AD7528TQ the optimal balance of accuracy, reliability, and supply chain stability for demanding embedded systems.
Availability
AD7528TQ is available at Aetrix Electronics and suitable for stereo audio circuits, programmable filter tuning, dual-channel attenuators, and digitally controlled window comparators requiring stable component supply across extended temperature ranges.
Supply support for AD7528TQ 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 aerospace markets since 1965.
The AD7528 product line delivers dual 8-bit multiplying DACs optimized for applications demanding matched channel performance, wide supply voltage range (+5 V to +15 V), and operation in extreme environments-targeting audio, test equipment, and real-time control systems.
FAQ
What is the operating temperature range of the AD7528TQ?
AD7528TQ is specified for continuous operation from –55°C to +125°C, qualifying it for extended-temperature applications including avionics, downhole oilfield tools, and military electronics. This rating is confirmed in the Ordering Guide and Absolute Maximum Ratings section of the AD7528 datasheet Rev. B, where "T" denotes the extended temperature grade and "Q" indicates cerdip packaging.
Does the AD7528TQ support four-quadrant multiplication?
Yes, AD7528TQ supports true four-quadrant multiplication when configured with external op-amps in the bipolar (offset binary) mode shown in Figure 5 of the datasheet. Each DAC accepts independent reference inputs (VREFA/VREFB) and generates output currents that scale linearly across positive and negative reference polarities, enabling gain control of AC signals with DC offset.
What package type is used for the AD7528TQ?
AD7528TQ uses a 20-lead cerdip (ceramic DIP) package designated Q-20, featuring side-brazed ceramic construction and metal lid. Per the Ordering Guide footnote, Analog Devices may ship side-brazed ceramic in lieu of cerdip, but all units are marked with the "Q" designator and meet the same mechanical and thermal specifications.
How does the AD7528TQ interface with an 8085 microprocessor?
AD7528TQ interfaces directly with the 8085 CPU using its standard 8-bit data bus (DB0–DB7), address decoding for chip select (CS), and WR strobe. As shown in Figure 12 of the datasheet, the 8085's ALE signal clocks an external latch (e.g., 8212) to hold the DAC A/DAC B select line, enabling simultaneous update of both DACs using the SHLD instruction with H/L register contents.
Can the gain error of the AD7528TQ be adjusted to zero?
Yes, the gain error of AD7528TQ can be trimmed to zero using external resistors R1–R4 as detailed in Figures 4 and 5 and Table III of the datasheet. For the T-grade, recommended values are 500 Ω for R1/R3 and 150 Ω for R2/R4; adjustment is performed by setting DAC latches to 11111111 and tuning R1/R3 until output equals ideal full-scale value.
AD7528TQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of Bits:
- 8
- Number of D/A Converters:
- 2
- Settling Time:
- 400ns
- Output Type:
- Current - Unbuffered
- Differential Output:
- No
- Data Interface:
- Parallel
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V ~ 15V
- Voltage - Supply, Digital:
- 5V ~ 15V
- INL/DNL (LSB):
- ±0.5 (Max), ±1 (Max)
- Architecture:
- R-2R
- Operating Temperature:
- -55°C ~ 125°C
- Supplier Device Package:
- 20-CERDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7528TQ FAQ
1.How can I place an order for AD7528TQ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7528TQ 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 AD7528TQ reliable?
The price and inventory of AD7528TQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7528TQ is usually 5 days.
3.What payment methods are accepted for AD7528TQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7528TQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7528TQ?
AD7528TQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7528TQ 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 AD7528TQ?
For technical support, including AD7528TQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7528TQ requirements.
6.How does Aetrix verify that AD7528TQ is sourced from the original manufacturer or authorized distributors?
All AD7528TQ 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 AD7528TQ meets industry standards.
7.What is the process for return or replacement of AD7528TQ?
All AD7528TQ units undergo pre-shipment inspection (PSI). If there is an issue with AD7528TQ, 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 AD7528TQ part is unused and in its original packaging.
Return procedure for AD7528TQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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