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Analog Devices Inc. DAC8426FR
- Part No.:
- DAC8426FR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
DAC8426FR.pdf
- Description:
- IC DAC 8BIT V-OUT 20CERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,932
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Product details
Overview
DAC8426FR from Analog Devices is a quad 8-bit voltage-output CMOS DAC with integrated 10 V bandgap reference, designed for multichannel precision analog control in industrial and process systems. It delivers ±2 LSB total unadjusted error over –40°C to +85°C, supports TTL/CMOS-compatible digital inputs, and operates from a single +15 V supply. Its four independent DACs share a laser-trimmed reference and drive outputs up to 10 mA.
For engineers reviewing the DAC8426FR datasheet, DAC8426FR pinout, DAC8426FR application, or DAC8426FR equivalent, key selection criteria include guaranteed monotonicity (±1 LSB DNL), 3 µs settling time to ±1/2 LSB, internal reference load capability (5 mA), and compatibility with legacy PM-7226 sockets without external reference redesign.
Technical Context
The DAC8426FR integrates four R-2R ladder DACs, individual input latches, address decoding logic (A0/A1), and unity-gain output buffer amplifiers-all on a single silicon-gate CMOS die. Each DAC is selected via two address lines and loaded on the rising edge of WR, with all digital inputs compatible with 5 V TTL/CMOS logic levels.
Its internal 10 V reference features 20 ppm/°C temperature coefficient, 0.1%/mA load regulation, and is directly connected to all four DAC reference inputs. The output buffers provide ±4 V/µs slew rate, sink up to 450 µA (VSS = –5 V), and source up to 10 mA into 2 kΩ loads-enabling direct op amp interface without external gain stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - defines 256 discrete output steps across 0–9.961 V full-scale range |
| Total Unadjusted Error | ±2 LSB max - guarantees worst-case output deviation including reference, INL, DNL, and zero-scale error |
| Settling Time | 3 µs to ±1/2 LSB - ensures rapid stable output after digital update, critical for closed-loop calibration |
| Reference Output | 10.04 V max, 20 ppm/°C - provides stable, trimmed voltage source for internal DACs and external circuitry |
| Digital Input Compatibility | TTL/CMOS 5 V - eliminates level-shifting requirements when interfacing with standard microprocessors |
| Output Drive Capability | 10 mA source / 450 µA sink - enables direct connection to op amp inputs or low-impedance loads without buffering |
| Supply Operation | +15 V single supply (VSS = 0 V) or dual supply (+15 V/–5 V) - supports both unipolar and improved negative-swing bipolar configurations |
Pinout & Package
Package: 20-pin Cerdip (Q-20), hermetically sealed ceramic DIP with 0.300-inch width, rated for –40°C to +85°C operation and suitable for high-reliability industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT B | DAC B analog output | Buffered voltage output for second DAC channel; capable of sourcing 10 mA or sinking 450 µA |
| 2 - VOUT A | DAC A analog output | Primary output channel; shares internal 10 V reference and AGND with other DACs |
| 3 - VSS | Negative supply terminal | Required for dual-supply operation (–5 V); optional ground return in single-supply mode |
| 4 - VREF OUT | Internal reference output | 10 V bandgap reference available externally; supplies up to 5 mA to external devices |
| 5 - AGND | Analog ground reference | Common return for internal DAC ladders, reference, and output buffers; must be isolated from DGND |
| 6 - DGND | Digital ground reference | Return path for digital inputs (DB0–DB7, WR, A0, A1); separation from AGND reduces digital noise coupling |
| 7–14 - DB7–DB0 | 8-bit parallel data bus | MSB-to-LSB inputs accepting TTL/CMOS logic; latched into selected DAC on WR rising edge |
| 15 - WR | Write strobe control | Active-low signal; rising edge latches data into addressed DAC (A0/A1 decoded) |
| 16–17 - A1/A0 | DAC address select | Binary-encoded selection of one of four DACs (A–D); transparent during WR low, latched on WR rise |
| 18 - VDD | Positive supply input | +15 V ±10% supply; powers analog and digital sections; requires 0.1 µF + 6.8–10 µF bypassing |
| 19–20 - VOUT D / VOUT C | DAC D and DAC C outputs | Remaining two buffered analog outputs; identical electrical specs to VOUT A/B |
Key Features
| Feature | Design Value |
|---|---|
| No external reference required | Integrated 10 V bandgap reference eliminates need for discrete reference IC and associated layout complexity |
| Pin-for-pin replacement for PM-7226 | Direct drop-in upgrade path for legacy designs using PM-7226 sockets, reducing redesign effort and qualification time |
| Guaranteed monotonicity | ±1 LSB differential nonlinearity ensures strictly increasing output with increasing code-essential for servo and feedback loops |
| Fast 50 ns write pulse support | Enables direct interface with high-speed microprocessors (8085, Z-80, 68000) without wait-state insertion |
| Low digital crosstalk | 10 nVs coupling between DACs minimizes interference during simultaneous updates-critical for multichannel synchronization |
| Robust ESD protection | Withstands 1500 V HBM transients; zener-protected digital inputs reduce risk of field failure during handling and assembly |
Applications
| Process Control Calibration | Microprocessor-Controlled Op Amp Trim |
|---|---|
|
Use Scenario: Adjusting gain and offset of analog sensor signal conditioning circuits in PLC I/O modules. IC Role / Device Role / Timing Role: DAC8426FR provides four independent, stable DC bias voltages to calibrate amplifier stages in real time. Use Value: Eliminates manual potentiometers and reduces calibration drift by leveraging laser-trimmed internal reference and matched DAC channels. |
Use Scenario: Dynamic recalibration of instrumentation amplifiers in automated test equipment during self-test sequences. IC Role / Device Role / Timing Role: DAC8426FR acts as programmable offset/gain setpoint generator, updated via microprocessor-controlled WR strobes. Use Value: Achieves <3 µs settling per channel, enabling sub-millisecond multi-channel calibration cycles without external settling delays. |
| Multi-Channel Level Setting | Threshold Generation for Analog Monitoring |
|
Use Scenario: Setting individual voltage thresholds for four independent analog comparators monitoring power supply rails. IC Role / Device Role / Timing Role: DAC8426FR generates precise, software-adjustable reference voltages for comparator inputs. Use Value: Uses shared internal 10 V reference to ensure tight channel-to-channel matching (<0.01% typical), minimizing threshold skew. |
Use Scenario: Generating fault detection thresholds in motor drive controllers for overcurrent, overtemperature, and undervoltage alarms. IC Role / Device Role / Timing Role: DAC8426FR supplies stable, temperature-compensated trip points to analog comparators with minimal drift. Use Value: Leverages 20 ppm/°C reference TC and ±2 LSB TUE to maintain alarm accuracy across –40°C to +85°C industrial operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 8-bit voltage-output DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7226KPZ | Same pinout, ±1 LSB TUE grade, but requires external 10 V reference; no internal reference output | Used where higher initial accuracy is prioritized over board space and reference integration | Select AD7226KPZ only if system already includes a high-stability external reference and layout allows extra component placement |
| DAC8426FP | Identical electrical specs and internal reference, but in 20-pin plastic DIP (N-20) instead of Cerdip (Q-20) | Preferred for cost-sensitive commercial applications where hermetic sealing is not required | Choose DAC8426FP for lower-cost production runs where extended temperature range and hermetic reliability are not mandatory |
Compared with AD7226KPZ and DAC8426FP, DAC8426FR uniquely combines internal 10 V reference, hermetic Cerdip packaging, and ±2 LSB accuracy in a single industrial-grade device-reducing BOM count, improving thermal stability, and enabling direct socket replacement in legacy PM-7226 systems without reference redesign.
Availability
DAC8426FR is available at Aetrix Electronics and suitable for process control calibration, multichannel op amp trim, and industrial threshold generation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for DAC8426FR 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 DAC8426FR belongs to Analog Devices' legacy precision DAC family designed specifically for multichannel industrial calibration and control-emphasizing reference integration, socket compatibility, and robustness in harsh environments.
FAQ
What is the operating temperature range for DAC8426FR?
DAC8426FR is specified for operation from –40°C to +85°C, making it suitable for extended industrial environments. This range applies to all electrical performance parameters including total unadjusted error (±2 LSB), reference stability (20 ppm/°C), and output settling time (3 µs). The Cerdip package contributes to reliable thermal performance under sustained ambient stress.
Does DAC8426FR require an external reference?
No, DAC8426FR does not require an external reference. It integrates a laser-trimmed 10 V bandgap reference with 20 ppm/°C temperature coefficient and 5 mA output drive capability. Pin 4 (VREF OUT) provides this reference for internal DAC use and can also supply external circuitry-eliminating the need for discrete reference ICs in most applications.
How is DAC selection controlled on DAC8426FR?
DAC8426FR uses two address inputs (A0 and A1) and a write strobe (WR) to select and load data into one of four DACs. When WR transitions from low to high, the 8-bit data on DB7–DB0 is latched into the DAC selected by the binary value of A1/A0 (A=00, B=01, C=10, D=11). This allows sequential or random access to any channel without affecting others.
Can DAC8426FR operate from a single supply?
Yes, DAC8426FR supports single-supply operation with VDD = +15 V and VSS = 0 V. In this configuration, outputs swing from 0 V to 9.961 V (unipolar). For improved negative-going settling near zero volts, dual supply (+15 V/–5 V) is recommended-but not required. Output sink current decreases near AGND in single-supply mode, with resistive behavior below 200 mV.
What is the maximum load current DAC8426FR can drive per output?
Each DAC output of DAC8426FR can source up to 10 mA into a 2 kΩ minimum load, or sink up to 450 µA when VSS = –5 V. The output buffer amplifiers are unity-gain configured and internally compensated for capacitive loads up to 3300 pF. Driving heavier loads requires external buffering to maintain specified settling time and linearity.
DAC8426FR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of Bits:
- 8
- Number of D/A Converters:
- 4
- Settling Time:
- 3µs (Typ)
- Output Type:
- Voltage - Buffered
- Differential Output:
- No
- Data Interface:
- Parallel
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- 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:
- -
DAC8426FR FAQ
1.How can I place an order for DAC8426FR through Aetrix?
Please submit a Request for Quotation (RFQ) for DAC8426FR 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 DAC8426FR reliable?
The price and inventory of DAC8426FR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DAC8426FR is usually 5 days.
3.What payment methods are accepted for DAC8426FR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DAC8426FR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DAC8426FR?
DAC8426FR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DAC8426FR 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 DAC8426FR?
For technical support, including DAC8426FR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DAC8426FR requirements.
6.How does Aetrix verify that DAC8426FR is sourced from the original manufacturer or authorized distributors?
All DAC8426FR 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 DAC8426FR meets industry standards.
7.What is the process for return or replacement of DAC8426FR?
All DAC8426FR units undergo pre-shipment inspection (PSI). If there is an issue with DAC8426FR, 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 DAC8426FR part is unused and in its original packaging.
Return procedure for DAC8426FR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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