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Analog Devices Inc. AD7245AARZ-REEL
- Part No.:
- AD7245AARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7245AARZ-REEL.pdf
- Description:
- IC DAC 12BIT V-OUT 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:379
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Product details
Overview
AD7245AARZ-REEL from Analog Devices is a 12-bit, voltage-output digital-to-analog converter (DAC) with integrated output amplifier and on-chip 5 V buried Zener reference. It supports unipolar (0 V to 5 V, 0 V to 10 V) and bipolar (±5 V) output ranges, operates from +12 V to +15 V (VDD) and –12 V to –15 V (VSS), delivers ±1/2 LSB linearity (B-grade), and features parallel 12-bit loading with CS/WR control and asynchronous LDAC update - used in precision industrial control loops, automated test equipment, and programmable power supply setpoints.
For engineers reviewing the AD7245AARZ-REEL datasheet, AD7245AARZ-REEL pinout, AD7245AARZ-REEL application, or AD7245AARZ-REEL equivalent, key selection criteria include its single-chip DACPORT® integration, ±1/2 LSB relative accuracy over –40°C to +85°C, 7 µs full-scale settling time, 65 mW typical power dissipation, and SOIC-24 package compatibility with legacy AD7245 designs.
Technical Context
The AD7245AARZ-REEL implements a voltage-mode R–2R ladder DAC architecture with twelve high-speed NMOS switches, buffered by a noninverting CMOS output amplifier capable of driving 10 V into a 2 kΩ load. Its on-chip 5 V Zener reference is temperature-compensated (±25 ppm/°C typ) and decoupled via internal buffering for low-noise operation (25 nV/√Hz at 1 kHz).
Digital interface logic uses level-triggered, TTL/CMOS-compatible control signals: CS and WR load 12-bit parallel data into the input latch on WR's rising edge; LDAC asynchronously transfers data to the DAC latch; CLR resets the DAC latch to all 0s. The device achieves monotonicity (±1 LSB DNL) and supports dual-supply operation for true bipolar output swing without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - defines 4096 discrete output steps across full-scale range |
| Relative Accuracy | ±1/2 LSB max (–40°C to +85°C) - ensures endpoint linearity within 1.22 mV for 0–5 V range |
| Settling Time | 7 µs to ±1/2 LSB - enables stable analog output updates at ≤140 kHz update rate |
| Reference Output | 4.99 V / 5.01 V @ 25°C - trimmed Zener provides stable, low-drift internal reference |
| Supply Range | +10.8 V to +16.5 V (VDD), –10.8 V to –16.5 V (VSS) - supports robust industrial rail margins |
| Power Dissipation | 65 mW typ (single supply) - enables thermally constrained PCB layouts without forced cooling |
| Digital Feedthrough | 10 nV·s typ - minimizes transient coupling from digital switching into analog output path |
Pinout & Package
AD7245AARZ-REEL is housed in a 24-lead SOIC (Small Outline Integrated Circuit) package, 0.3" wide, RoHS-compliant, with gull-wing leads and moisture sensitivity level (MSL) 3. Pin numbering follows standard SOIC convention with Pin 1 indicator notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS | Negative supply rail | Accepts 0 V (single supply) or –12 V to –15 V (dual supply); sets lower bound of output range |
| ROFS | Bipolar offset resistor tap | Connects to AGND or REF OUT to configure 0–5 V, 0–10 V, or ±5 V output ranges |
| REF OUT | Buffered Zener reference output | Provides 5 V ±10 mV reference for external circuitry or bipolar configuration |
| AGND | Analog ground reference | Must be isolated from DGND to minimize noise coupling into DAC core |
| DB11–DB0 | 12-bit parallel data bus | MSB-first, right-justified input; latched on rising edge of WR when CS active |
| DGND | Digital ground reference | Separate return path for control logic; tied to system digital ground plane |
| CS | Chip select (active low) | Enables input latch; must be low with WR to load data - critical for microprocessor interfacing |
| WR | Write strobe (active low) | Latches DB11–DB0 on rising edge; timing-critical for 30 ns setup (typ) compliance |
| LDAC | Load DAC (active low) | Asynchronously transfers data from input latch to DAC latch - enables synchronized multi-DAC updates |
| CLR | Clear DAC latch (active low) | Resets DAC latch to all 0s; used for power-on reset or calibration zero-override |
| VDD | Positive supply rail | +12 V to +15 V operation; supplies DAC core, reference, and output amplifier |
| RFB | Amplifier feedback node | External connection point for gain-setting; tied to VOUT in standard 0–10 V configuration |
| VOUT | Analog voltage output | Delivers final scaled output; capable of sourcing/sinking 2.5 mA into 2 kΩ load |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic DACPORT® integration | Single-chip solution eliminates external trims, reference ICs, and op-amps - reduces BOM count and layout area by >40% vs. discrete DAC designs |
| ±1/2 LSB linearity grade (B version) | Guaranteed endpoint accuracy enables closed-loop control without software calibration in 12-bit systems |
| 30 ns typical data setup time | Direct interface to 8051, ARM Cortex-M3/M4, and FPGA I/O without wait states or glue logic |
| Extended temperature range (–40°C to +85°C) | Validated performance across industrial ambient conditions - no derating required for enclosure-mounted applications |
| On-chip 5 V Zener reference | Eliminates need for external reference IC; ±25 ppm/°C tempco ensures <0.1% full-scale drift over operating range |
Applications
| Industrial Process Control | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Generating precise analog setpoints for PID controllers regulating temperature, pressure, or flow in PLC-based systems. IC Role / Device Role / Timing Role: Voltage-output DAC providing calibrated 0–10 V or 4–20 mA loop driver reference (via external I/V converter). Use Value: ±1/2 LSB linearity ensures <±1.22 mV error in 0–5 V range, enabling sub-0.03% setpoint accuracy critical for Class A instrumentation. | Use Scenario: Stimulus generation for functional testing of ADCs, sensors, and analog front-ends in production test fixtures. IC Role / Device Role / Timing Role: High-fidelity waveform generator with 7 µs settling enabling 140 kHz step-response testing and DC accuracy validation. Use Value: On-chip reference and amplifier eliminate external component drift, ensuring traceable metrology-grade stimulus without recalibration between batches. |
| Programmable Power Supplies | Medical Instrumentation |
Use Scenario: Setting output voltage/current limits and regulation references in digitally controlled lab and bench power supplies. IC Role / Device Role / Timing Role: Precision DAC controlling error amplifier reference in linear or switching regulator feedback paths. Use Value: Dual-supply capability (±5 V) allows symmetric control of positive/negative rails; 65 mW dissipation enables compact heatsink-free designs. | Use Scenario: Generating calibrated bias voltages and sensor excitation signals in portable ECG, EEG, and patient monitoring devices. IC Role / Device Role / Timing Role: Low-noise, low-glitch DAC supplying stable reference to instrumentation amplifiers and ADC drivers. Use Value: 10 nV·s digital feedthrough and 25 nV/√Hz amplifier noise prevent signal corruption in µV-level bio-potential measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7392ARZ | 12-bit, serial SPI interface; no integrated reference; requires external 2.5 V ref; 10 µs settling | Lacks on-chip reference and parallel interface - unsuitable for direct microprocessor bus attachment | Select AD7392ARZ only when board space is constrained and SPI control is preferred over parallel |
| MAX538BCPE+ | 12-bit, parallel interface; external reference required; ±1 LSB linearity; 10 µs settling; 20-pin PDIP | No internal reference or output amplifier - demands external op-amp and precision ref IC | Choose MAX538BCPE+ only if cost sensitivity outweighs design simplicity and long-term stability requirements |
Compared with AD7245AARZ-REEL, AD7392ARZ trades integrated functionality for serial interface flexibility, while MAX538BCPE+ increases system complexity with external reference and amplification - making AD7245AARZ-REEL the optimal choice for space-constrained, high-accuracy, microprocessor-connected DAC applications requiring minimal external components.
Availability
AD7245AARZ-REEL is available at Aetrix Electronics and suitable for industrial process control, automated test equipment, and programmable power supply designs requiring stable component supply, long-lifecycle support, and guaranteed parametric performance across –40°C to +85°C.
Supply support for AD7245AARZ-REEL 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, headquartered in Norwood, MA.
The AD7245AARZ-REEL belongs to the DACPORT® family - designed specifically for embedded industrial and instrumentation applications demanding monolithic integration, high DC accuracy, and robust operation without external trimming.
FAQ
What output voltage ranges does the AD7245AARZ-REEL support?
The AD7245AARZ-REEL supports three configurable output ranges: 0 V to 5 V, 0 V to 10 V, and ±5 V. Selection is achieved via external connections to ROFS and REF OUT pins. For 0–10 V operation, ROFS is tied to AGND and RFB to VOUT; for ±5 V, ROFS connects to REF OUT and VSS is set to –12 V to –15 V. All configurations use the same AD7245AARZ-REEL device without hardware variants.
Does the AD7245AARZ-REEL require external calibration or trimming?
No, the AD7245AARZ-REEL requires no external user trims to achieve full specified performance. Its on-chip 5 V buried Zener reference is factory-trimmed for absolute accuracy and temperature coefficient, and the R–2R DAC ladder and output amplifier are laser-trimmed during production. Full 12-bit linearity and gain accuracy are guaranteed over temperature with only the AD7245AARZ-REEL installed.
How does the CLR pin function in the AD7245AARZ-REEL?
The CLR (Clear) pin on the AD7245AARZ-REEL is an active-low signal that resets the DAC latch contents to all 0s. When asserted, it forces VOUT to 0 V in unipolar mode or –5 V in bipolar mode. It supports both zero-override during operation and power-on reset functionality. In latched mode, CLR permanently loads zeros into the DAC latch; in transparent mode, it acts as a momentary output override - a key feature implemented directly in the AD7245AARZ-REEL silicon.
Can the AD7245AARZ-REEL operate from a single +15 V supply?
Yes, the AD7245AARZ-REEL can operate from a single +15 V supply with VSS = 0 V (AGND). In this configuration, it delivers unipolar outputs of 0 V to 5 V or 0 V to 10 V. However, the output cannot go below 0 V due to the grounded negative rail; for true bipolar operation (–5 V to +5 V), a dual supply (e.g., VDD = +15 V, VSS = –15 V) is required. This behavior is inherent to the AD7245AARZ-REEL's architecture.
What is the purpose of the RFB pin on the AD7245AARZ-REEL?
The RFB (Feedback Resistor) pin on the AD7245AARZ-REEL provides access to the internal output amplifier's feedback node. In standard 0–10 V configuration, RFB is connected directly to VOUT to set unity gain for the 2× reference scaling. It enables external gain adjustment or compensation network insertion - a design flexibility built into the AD7245AARZ-REEL's monolithic amplifier stage, unlike DACs requiring fully external op-amps.
AD7245AARZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- DACPORT®
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of Bits:
- 12
- Number of D/A Converters:
- 1
- Settling Time:
- 7µs
- Output Type:
- Voltage - Buffered
- Differential Output:
- No
- Data Interface:
- Parallel
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- ±10.8V ~ 16.5V
- Voltage - Supply, Digital:
- 10.8V ~ 16.5V
- INL/DNL (LSB):
- ±1 (Max), ±1 (Max)
- Architecture:
- R-2R
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7245AARZ-REEL FAQ
1.How can I place an order for AD7245AARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7245AARZ-REEL 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 AD7245AARZ-REEL reliable?
The price and inventory of AD7245AARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7245AARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7245AARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7245AARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7245AARZ-REEL?
AD7245AARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7245AARZ-REEL 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 AD7245AARZ-REEL?
For technical support, including AD7245AARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7245AARZ-REEL requirements.
6.How does Aetrix verify that AD7245AARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7245AARZ-REEL 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 AD7245AARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7245AARZ-REEL?
All AD7245AARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7245AARZ-REEL, 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 AD7245AARZ-REEL part is unused and in its original packaging.
Return procedure for AD7245AARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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