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Analog Devices Inc. AD7945BR-REEL
- Part No.:
- AD7945BR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7945BR-REEL.pdf
- Description:
- IC DAC 12BIT A-OUT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,147
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Product details
Overview
AD7945BR-REEL from Analog Devices is a 12-bit parallel-input multiplying current-output DAC operating from +3.3 V to +5.5 V, delivering ±0.5 LSB integral nonlinearity, 600 ns settling time to 0.01%, and 60 nV·s glitch impulse-designed for precision waveform generation in battery-powered instrumentation and laptop computer power management.
For engineers reviewing the AD7945BR-REEL datasheet, AD7945BR-REEL pinout, AD7945BR-REEL application, or AD7945BR-REEL equivalent, key selection criteria include guaranteed monotonicity over –40°C to +85°C, 40 ns write pulsewidth timing, low 5 mW typical power consumption, and compatibility with standard op-amps (e.g., AD843) for unipolar/bipolar voltage output configurations.
Technical Context
The AD7945BR-REEL implements a segmented 12-bit architecture: the two most significant bits control three large-current switches (A/B/C), while the remaining ten bits drive a binary-weighted R-2R ladder. This structure ensures constant input resistance at VREF (6–12 kΩ) regardless of code, enabling stable multiplying operation across ac/dc reference signals.
It operates in Normal Mode (VDD = +4.5 V to +5.5 V, AGND = DGND = 0 V) or Biased Mode (VDD = +3.0 V to +5.5 V, AGND biased to 1.23 V), supporting both two-quadrant (unipolar) and four-quadrant (bipolar) multiplication via external op-amp feedback networks tied to IOUT1 and RFB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels with nominal LSB = VREF/4096 in unipolar mode |
| INL / DNL | ±0.5 LSB max - guarantees monotonic transfer function and <0.012% full-scale linearity error over temperature |
| Settling Time | 600 ns to 0.01% - enables >1 MHz update rates when paired with AD843 op-amp in normal mode |
| Glitch Impulse | 60 nV·s typ - minimizes transient injection during code transitions, critical for low-distortion signal synthesis |
| Power Consumption | 5 mW typ at +5 V - supports extended runtime in portable systems without active thermal management |
| Digital Interface | 12-bit parallel bus (DB11–DB0), active-low CS and WR - compatible with microcontroller GPIO or FPGA I/O banks |
| Supply Range | +3.0 V to +5.5 V - allows direct interfacing with both 3.3 V and 5 V logic domains without level-shifting |
Pinout & Package
AD7945BR-REEL is housed in a 20-lead Small Outline Package (SOP), RoHS-compliant, with gull-wing leads and 0.65 mm pitch. Thermal impedance θJA = 75°C/W supports continuous operation up to +85°C ambient without heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DB11–DB0 | Parallel digital data inputs (MSB to LSB) | Accept 12-bit word on rising edge of WR; latched synchronously with CS assertion |
| CS | Active-low chip select | Enables internal logic only when low; isolates bus during multi-DAC sharing |
| WR | Active-low write strobe | 40 ns minimum pulsewidth required; loads DB11–DB0 into DAC register when CS = low |
| IOUT1 | Main current output terminal | Sinks full-scale current (IFS ≈ VREF/RFB); connected to virtual ground of external op-amp |
| RFB | Internal feedback resistor tap | Provides access to R-2R ladder node; used with external op-amp for voltage output conversion |
| VREF | Reference voltage input | Accepts dc or ac signal (±15 V absolute max); sets full-scale output range and gain scaling factor |
| AGND | Analog ground reference | Internally tied to IOUT2; must be decoupled near device; separates analog switching noise from digital domain |
| DGND | Digital ground reference | Connects to system digital ground plane; requires star-point tie to AGND at single point |
| VDD | Positive supply rail | Supports +3.0 V to +5.5 V; powers both analog core and digital interface; bypass with 0.1 µF ceramic |
Key Features
| Feature | Design Value |
|---|---|
| Segmented 12-bit architecture | Combines 2-bit thermometer-coded MSBs with 10-bit R-2R ladder to maintain constant VREF input resistance (6–12 kΩ) across all codes |
| Guaranteed monotonicity | Ensures no code-to-code output reversal over full industrial temperature range (–40°C to +85°C), eliminating step errors in closed-loop control |
| Low-glitch current output | 60 nV·s glitch impulse enables clean waveform reconstruction in audio and arbitrary waveform generators without post-filtering |
| Single-supply bias support | Operates in Biased Mode with AGND = 1.23 V, allowing full-scale swing from 0.01 V to 2.46 V using only +3.3 V supply and 2.45 V p-p VREF |
| Fast parallel interface | 40 ns write pulsewidth and 20 ns data hold time enable direct connection to high-speed microcontrollers and FPGAs without glue logic |
Applications
| Portable Instrumentation Calibration | Laptop Power Management |
|---|---|
Use Scenario: Precision DC offset and gain trimming in handheld multimeters and sensor calibrators powered by Li-ion batteries. IC Role / Device Role / Timing Role: Current-output DAC generating stable reference voltages for ADC front-end biasing and PGA gain control. Use Value: ±0.5 LSB INL ensures calibration accuracy better than 0.012% FS, extending recalibration intervals and reducing test overhead. |
Use Scenario: Dynamic voltage scaling for CPU/GPU VRMs in ultrabooks, adjusting output setpoints based on thermal and load conditions. IC Role / Device Role / Timing Role: Fast-settling DAC driving voltage-mode controller references with 600 ns response to workload changes. Use Value: 5 mW typical power and 3.3 V compatibility eliminate need for auxiliary LDOs, simplifying PMIC integration. |
| Legacy 754x DAC Upgrade Path | Industrial Process Control Output |
Use Scenario: Drop-in replacement for AD7545 in automated test equipment requiring improved speed and reduced power. IC Role / Device Role / Timing Role: Pin-compatible 12-bit DAC with identical 20-pin SOP footprint and parallel interface timing. Use Value: 40 ns write pulsewidth cuts update latency by 50% vs. AD7545's 80 ns, enabling faster test sequence execution. |
Use Scenario: 4–20 mA transmitter loop calibration and programmable setpoint generation in PLC analog output modules. IC Role / Device Role / Timing Role: Multiplying DAC configured in four-quadrant mode with bipolar op-amp to generate precise current-loop references. Use Value: Constant VREF input resistance (6–12 kΩ) prevents loading errors when driven by precision voltage references or isolated DC-DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit parallel DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7545BN | Slower 80 ns write pulsewidth; ±1 LSB INL; higher 15 mW power; same 20-pin DIP/SOP package | Legacy design with lower speed/power performance; lacks Biased Mode support | Select when cost sensitivity outweighs speed/accuracy needs and existing PCB layout must be reused |
| MAX538BCPP | 12-bit, 5 V supply only; ±1 LSB INL; 1 µs settling; SPI interface instead of parallel | Requires serial interface redesign; not pin-compatible; suited for space-constrained designs | Choose for new designs prioritizing board area reduction over parallel bus simplicity |
Compared with AD7545BN, AD7945BR-REEL delivers 2× faster updates and half the power; versus MAX538BCPP, it retains native parallel interface compatibility but trades off serial configurability and smaller footprint.
Availability
AD7945BR-REEL is available at Aetrix Electronics and suitable for battery-powered instrumentation, laptop power management, and industrial process control requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AD7945BR-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision measurement, industrial automation, and communications markets since 1965.
The AD7945BR-REEL belongs to Analog Devices' precision multiplying DAC product line, engineered for applications demanding accurate, low-glitch, fast-settling current outputs in resource-constrained environments.
FAQ
What is the maximum operating temperature range for the AD7945BR-REEL?
The AD7945BR-REEL is rated for industrial operation from –40°C to +85°C. It is specified with ±0.5 LSB INL and DNL across this full range, and its SOP package has a θJA of 75°C/W, enabling reliable use in unventilated enclosures. The T-grade variant (AD7945TQ) extends to –55°C to +125°C but uses a Cerdip package-not applicable to AD7945BR-REEL.
Can the AD7945BR-REEL operate from a 3.3 V supply only?
Yes, the AD7945BR-REEL supports single-supply operation from +3.0 V to +5.5 V. In Biased Mode, it functions with AGND = 1.23 V and VREF = 0 V to 2.45 V p-p, enabling full-scale output swing from 0.01 V to 2.46 V-ideal for 3.3 V systems without level shifters. Normal Mode requires ≥4.5 V for guaranteed specs.
How is the AD7945BR-REEL different from the AD7945BN?
The AD7945BR-REEL uses a 20-lead SOP (R-20) package in tape-and-reel format for automated assembly, whereas AD7945BN uses a 20-lead plastic DIP (N-20). Both share identical electrical specifications, pinout, and temperature grade (B: –40°C to +85°C), but AD7945BR-REEL is optimized for SMT production and offers tighter moisture sensitivity level (MSL 3).
Does the AD7945BR-REEL require an external op-amp to generate voltage output?
Yes-the AD7945BR-REEL is a current-output DAC. To produce a voltage output, an external op-amp must be connected between IOUT1 and RFB (inverting configuration), with AGND as reference. Common choices include AD843 (high speed), OP07 (low drift), or AD820 (single-supply compatible), depending on bandwidth and precision requirements.
Is the AD7945BR-REEL pin-compatible with the AD7545 series?
Yes-AD7945BR-REEL maintains identical 20-pin SOP pinout, signal naming (DB11–DB0, CS, WR, IOUT1, RFB, VREF, VDD, AGND, DGND), and basic timing (active-low parallel interface) with AD7545BN/BR. However, AD7945BR-REEL improves write pulsewidth (40 ns vs. 80 ns) and reduces power (5 mW vs. 15 mW), making it a functional drop-in upgrade.
AD7945BR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of Bits:
- 12
- Number of D/A Converters:
- 1
- Settling Time:
- 600µs (Typ)
- Output Type:
- Current - Unbuffered
- Differential Output:
- No
- Data Interface:
- Parallel
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- INL/DNL (LSB):
- ±0.5 (Max), ±0.5 (Max)
- Architecture:
- R-2R
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7945BR-REEL FAQ
1.How can I place an order for AD7945BR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7945BR-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 AD7945BR-REEL reliable?
The price and inventory of AD7945BR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7945BR-REEL is usually 5 days.
3.What payment methods are accepted for AD7945BR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7945BR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7945BR-REEL?
AD7945BR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7945BR-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 AD7945BR-REEL?
For technical support, including AD7945BR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7945BR-REEL requirements.
6.How does Aetrix verify that AD7945BR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7945BR-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 AD7945BR-REEL meets industry standards.
7.What is the process for return or replacement of AD7945BR-REEL?
All AD7945BR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7945BR-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 AD7945BR-REEL part is unused and in its original packaging.
Return procedure for AD7945BR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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