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Analog Devices Inc. AD5445YRU
- Part No.:
- AD5445YRU
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD5445YRU.pdf
- Description:
- IC DAC 12BIT A-OUT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,108
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Product details
Overview
AD5445YRU from Analog Devices is a 12-bit, current-output multiplying DAC with parallel interface, operating from 2.5 V to 5.5 V supply and supporting ±10 V reference input. It delivers 10 MHz multiplying bandwidth, ±1 LSB INL, 20.4 MSPS update rate, and guaranteed monotonicity - enabling high-fidelity waveform generation and precision programmable gain control in battery-powered instrumentation.
For engineers reviewing the AD5445YRU datasheet, AD5445YRU pinout, AD5445YRU application, or AD5445YRU equivalent, this page provides verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative parts for design flexibility in analog signal conditioning, calibration, and video/ultrasound systems.
Technical Context
The AD5445YRU implements a segmented R-2R ladder architecture with latched parallel interface and integrated feedback resistor (RFB = 12 kΩ), enabling precise I-to-V conversion when paired with an external op amp. Its 4-quadrant multiplication capability supports bipolar output scaling via dual-polarity reference voltage.
It features power-on reset with brownout detection, readback functionality for register verification, and low 0.4 µA typical supply current at extended temperature (–40°C to +125°C). The device avoids transparent mode operation, requiring explicit CS/R/W-controlled write cycles with 17 ns minimum write cycle time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - supports 4096 discrete output levels for high-precision analog control |
| INL | ±1 LSB - ensures accurate endpoint linearity after zero/full-scale calibration |
| Multiplying Bandwidth | 10 MHz - enables high-frequency AC signal synthesis up to 10 MHz with ±3.5 V reference |
| Update Rate | 20.4 MSPS - supports fast digital waveform generation without pipeline latency |
| Reference Input Range | ±10 V - allows full 4-quadrant multiplication with bipolar or unipolar references |
| Supply Voltage | 2.5 V to 5.5 V - compatible with single-cell Li-ion, 3.3 V, and 5 V logic domains |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial, and medical environments |
Pinout & Package
AD5445YRU is housed in a 20-lead TSSOP (4.4 mm × 6.5 mm) with exposed thermal pad connected to AGND. Pin functions are validated per Analog Devices Rev. E datasheet Figures 7 and 9.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IOUT1 | DAC Current Output | Main current source output; connects to I-to-V amplifier input for voltage-mode operation |
| IOUT2 | DAC Analog Ground | Must be tied to system analog ground; sets bias point for 4-quadrant multiplication |
| GND | Digital Ground | Logic ground reference; separate from IOUT2 for noise isolation in mixed-signal layout |
| DB0–DB11 | Parallel Data Inputs | 12-bit LSB-aligned data bus; DB0 = LSB, DB11 = MSB; requires synchronous CS/R/W strobing |
| CS | Chip Select | Active-low enable; rising edge loads data into input latch or initiates readback sequence |
| R/W | Read/Write Control | Low = write to latch; high = read DAC register contents back on DB pins |
| VDD | Power Supply | 2.5 V–5.5 V digital/analog supply; decoupling required within 1 cm of pin |
| VREF | Reference Input | ±10 V bipolar reference terminal; defines full-scale current output magnitude and polarity |
| RFB | Feedback Resistor | 12 kΩ internal resistor; connects to op amp output to close I-to-V loop with temperature tracking |
Key Features
| Feature | Design Value |
|---|---|
| Fast Parallel Interface | 17 ns write cycle enables direct microprocessor interfacing without FIFO buffering |
| Readback Function | Verifies register contents post-write - critical for fault-tolerant calibration systems |
| Power-On Reset | Guarantees zero-scale output at power-up; includes brownout detection to prevent glitching |
| Guaranteed Monotonic | No code-to-code nonmonotonic transitions across –40°C to +125°C - essential for closed-loop control |
| Low Power Consumption | 0.4 µA typical IDD at full temperature range - extends battery life in portable instrumentation |
Applications
| Waveform Generation | Programmable Gain Control |
|---|---|
|
Use Scenario: Generating precise sine, triangle, or arbitrary waveforms in portable ultrasound transmitters and test equipment. IC Role / Device Role / Timing Role: 12-bit current-output DAC providing programmable amplitude scaling synchronized to master clock. Use Value: 10 MHz multiplying bandwidth and ±1 LSB INL ensure <1% THD at 100 kHz output with 3.5 V p-p reference. |
Use Scenario: Digitally adjusting signal path gain in RF front-ends and optical transceivers without mechanical potentiometers. IC Role / Device Role / Timing Role: Multiplying DAC acting as digitally controlled attenuator/gain element using VREF as signal path input. Use Value: 4-quadrant operation supports bidirectional gain adjustment; ±10 V reference range enables >60 dB dynamic control range. |
| Digitally Controlled Calibration | Composite Video Signal Processing |
|
Use Scenario: Trimming offset and gain errors in sensor signal chains (e.g., pressure, temperature, strain gauges) during factory calibration. IC Role / Device Role / Timing Role: Precision DAC injecting correction currents into op amp summing nodes to null DC errors. Use Value: ±1 LSB INL and 0.4 µA supply current allow stable, low-drift trimming over temperature without self-heating artifacts. |
Use Scenario: Real-time luminance/chrominance level adjustment in broadcast-quality SD/HD video encoders. IC Role / Device Role / Timing Role: High-speed DAC generating sync-locked DC bias offsets for video amplifiers and clamping circuits. Use Value: 20.4 MSPS update rate and 30 ns settling time support NTSC/PAL timing constraints with minimal interline distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiplying DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5443YRUZ | 10-bit resolution, identical 20-lead TSSOP package and pinout; same 10 MHz bandwidth and ±10 V reference range | Limited to 1024-step resolution; lower SFDR (65 dB vs. 82 dB at 50 kHz) in narrowband video filtering | Select when 10-bit precision suffices and cost reduction is prioritized over full 12-bit linearity |
| AD5446YRUZ | 12-bit, same package and pinout; improved INL (±0.5 LSB) and lower glitch impulse (1 nV·s vs. 2 nV·s) | Higher cost; requires updated layout for revised thermal pad grounding per LFCSP variant | Choose for metrology-grade applications demanding sub-LSB linearity and reduced switching noise |
Compared with AD5445YRU, AD5443YRUZ trades resolution for cost in mid-accuracy waveform generation, while AD5446YRUZ enhances precision and noise performance at higher BOM cost and revised thermal management requirements.
Availability
AD5445YRU is available at Aetrix Electronics and suitable for portable battery-powered instrumentation, ultrasound transmitter modules, and programmable filter designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD5445YRU 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 AD54xx family was designed specifically for high-bandwidth multiplying DAC applications in portable, industrial, and medical systems where precision, low power, and wide reference voltage range are critical.
FAQ
What is the maximum reference voltage range supported by the AD5445YRU?
The AD5445YRU supports a reference voltage range of ±10 V at the VREF pin, enabling true 4-quadrant multiplication. This allows the device to scale both positive and negative input signals with full bipolar control - a key requirement for applications like programmable attenuators and composite video signal processing where bidirectional gain adjustment is needed. The ±10 V range is specified across the full –40°C to +125°C operating temperature range.
Does the AD5445YRU include an internal feedback resistor, and how is it used?
Yes, the AD5445YRU integrates a precision 12 kΩ feedback resistor (RFB) connected internally to the IOUT1 node. This resistor is used in conjunction with an external operational amplifier to form a closed-loop I-to-V converter. When the RFB pin is connected to the op amp's output and its inverting input tied to IOUT1, the circuit delivers a temperature-tracked voltage output proportional to the digital code and reference voltage - eliminating the need for external precision resistors in most configurations.
Can the AD5445YRU operate from a 3.3 V supply, and what are the implications?
Yes, the AD5445YRU operates from 2.5 V to 5.5 V, making 3.3 V fully compliant. At 3.3 V, logic thresholds remain valid (VIH = 1.7 V, VIL = 0.6 V), and dynamic performance is preserved: multiplying bandwidth stays at 10 MHz, and settling time remains ≤120 ns to ±1 mV full scale. However, power supply rejection degrades slightly above 100 kHz, so additional local decoupling (e.g., 100 nF X7R + 10 µF tantalum) is recommended near VDD for noise-sensitive applications.
How does the readback function work on the AD5445YRU, and when is it useful?
The AD5445YRU supports register readback via its parallel DB[11:0] pins. With CS low and R/W high, the contents of the DAC register appear on the DB pins within t8 (max 40 ns) after CS assertion. This feature enables real-time verification of written values - critical in safety-critical calibration systems, firmware-updated trim circuits, and fault-detection architectures where command-and-response integrity must be confirmed before committing to analog output changes.
Is the AD5445YRU pin-compatible with older AD7545-series DACs?
No, the AD5445YRU is not pin-compatible with the AD7545. While both are 12-bit multiplying DACs, the AD5445YRU uses a 20-lead TSSOP with dedicated IOUT2, RFB, and R/W pins, whereas the AD7545 uses a 20-pin DIP or 24-lead SOIC with different pin assignments and no native readback or power-on reset. The AD5445YRU is explicitly positioned as an *upgrade* - offering higher bandwidth, lower power, and enhanced features - but requires PCB redesign for migration.
AD5445YRU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of Bits:
- 12
- Number of D/A Converters:
- 1
- Settling Time:
- 120ns
- Output Type:
- Current - Unbuffered
- Differential Output:
- Yes
- Data Interface:
- Parallel
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.5V ~ 5.5V
- Voltage - Supply, Digital:
- 2.5V ~ 5.5V
- INL/DNL (LSB):
- ±1 (Max), -1/+2 (Max)
- Architecture:
- R-2R
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD5445YRU FAQ
1.How can I place an order for AD5445YRU through Aetrix?
Please submit a Request for Quotation (RFQ) for AD5445YRU 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 AD5445YRU reliable?
The price and inventory of AD5445YRU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD5445YRU is usually 5 days.
3.What payment methods are accepted for AD5445YRU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD5445YRU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD5445YRU?
AD5445YRU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD5445YRU 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 AD5445YRU?
For technical support, including AD5445YRU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD5445YRU requirements.
6.How does Aetrix verify that AD5445YRU is sourced from the original manufacturer or authorized distributors?
All AD5445YRU 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 AD5445YRU meets industry standards.
7.What is the process for return or replacement of AD5445YRU?
All AD5445YRU units undergo pre-shipment inspection (PSI). If there is an issue with AD5445YRU, 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 AD5445YRU part is unused and in its original packaging.
Return procedure for AD5445YRU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD5445YRU Tags
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