Part A
AD7945BRZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3622 PCS
- Package
- SOIC-20
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD7945BRZ and AD7943BR-REEL are functionally comparable 12-bit multiplying DACs sharing the same resolution, architecture, and package family, making the AD7945BRZ a viable replacement candidate for the AD7943BR-REEL in most designs. However, the two parts differ in digital interface timing and reference input configuration, so interface compatibility and reference drive requirements must be validated against the target application before substitution.
Resolution and Architecture
High match
Package Type
High match
Digital Interface Timing
Validation required
Reference Input Configuration
Validation required
Parts at a glance
Part B
AD7943BR-REEL
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 8509 PCS
- Package
- SOIC-16
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7945BRZ | AD7943BR-REEL | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit DACs, so resolution is identical and not a differentiator for substitutability. |
| Number of DAC Channels | 1 | 1 | Single-channel architecture in both parts means board layout and channel count requirements are compatible. |
| Digital Interface | Parallel | Serial (SPI-compatible) | The interface type is a critical difference: a parallel interface cannot be dropped into a serial-interface socket without redesign. |
| Supply Voltage (VDD) | 3.3 V to 5 V | 3.3 V to 5 V | Matching supply ranges allow the parts to operate in the same power domain without level shifting. |
| Reference Type | External | External | Both require an external reference, so reference circuitry can be reused across designs. |
| Package / Mounting | 20-Lead SOIC (Surface Mount) | 20-Lead SOIC (Surface Mount) | Identical package and footprint simplify physical replacement on an existing PCB. |
| Settling Time | 5 µs (typical) | 5 µs (typical) | Equivalent settling time means dynamic performance and update-rate capability are comparable. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range ensures both parts suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7945BRZ | AD7943BR-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Number of D/A Converters | 1 | 1 |
| Settling Time | 600µs (Typ) | 600µs (Typ) |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | No | No |
| Data Interface | Parallel | Serial |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| INL / DNL(LSB) | ±0.5 (Max), ±0.5 (Max) | ±0.5 (Max), ±0.5 (Max) |
| Architecture | R-2R | R-2R |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7945BRZ and AD7943BR-REEL?
Both are 12-bit multiplying DACs from Analog Devices, but the AD7945BRZ is a parallel-input device in a 20-lead SOIC package, while the AD7943BR-REEL is a serial-input device supplied in tape-and-reel packaging. The AD7945 offers a parallel interface for high-speed updates, whereas the AD7943 uses a serial interface for reduced pin count and board space.
Are the AD7945BRZ and AD7943BR-REEL pin-compatible?
No. The AD7945BRZ uses a 20-lead SOIC package with a parallel data bus, while the AD7943BR-REEL uses a 16-lead SOIC package with a serial interface. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.
What is the resolution and architecture of these DACs?
Both the AD7945BRZ and AD7943BR-REEL are 12-bit multiplying digital-to-analog converters based on a CMOS R-2R ladder architecture. They provide 12-bit resolution with a multiplying bandwidth suitable for signal processing and waveform generation applications.
What supply voltage do the AD7945BRZ and AD7943BR-REEL require?
Both devices operate from a single +5 V supply (with specified operation typically from +4.5 V to +5.5 V) and feature a low power consumption of approximately 5 µW in the power-down mode, making them suitable for portable and battery-powered systems.
What is the difference between the parallel and serial interface options?
The AD7945BRZ provides a parallel 12-bit data input for direct connection to a microprocessor bus, enabling fast update rates. The AD7943BR-REEL provides a serial (SPI/QSPI-compatible) interface, which reduces the number of I/O pins required and simplifies isolation in multi-channel systems.
Are the AD7945BRZ and AD7943BR-REEL RoHS compliant?
Yes. The "Z" suffix in AD7945BRZ and the "BR" grade in AD7943BR-REEL indicate RoHS-compliant, lead-free package options per Analog Devices' product ordering guide. Designers should confirm the specific ordering code against the manufacturer's datasheet for the exact compliance status of the purchased lot.
What are the typical applications for these multiplying DACs?
Both parts are used in applications such as programmable gain amplifiers, digitally controlled attenuators, waveform generation, and signal reconstruction. The AD7945BRZ's parallel interface suits high-speed control loops, while the AD7943BR-REEL's serial interface suits space-constrained or multi-channel designs.
What is the operating temperature range for these devices?
Both the AD7945BRZ and AD7943BR-REEL are specified for the industrial temperature range of −40 °C to +85 °C, as indicated by the "B" grade in their part numbers. This makes them suitable for industrial and instrumentation environments.