Part A
AD7945BRZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3622 PCS
- Package
- SOIC-20
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD7945BRZ and AD7948BR are both 12-bit multiplying DACs from Analog Devices in a 20-lead SOIC package, sharing the same resolution, architecture, and supply requirements. The AD7948BR offers a faster serial interface and higher update rate, making it a viable functional upgrade for the AD7945BRZ in most designs, provided the interface timing and reference configuration are validated against the target application.
Resolution
High match
Package Type
High match
Interface Type
Validation required
Update Rate
Validation required
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 | AD7948BR | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit DACs, so quantization step size and achievable output precision are equivalent. |
| Number of DAC Channels | 1 | 1 | Single-channel architecture in both parts means board layout and channel count requirements match. |
| Digital Interface | Parallel (12-bit word) | Parallel (12-bit word) | Interface type determines how the DAC connects to the host processor and whether the PCB routing is compatible. |
| Supply Voltage (VDD) | 3.3 V to 5.5 V | 3.3 V to 5.5 V | Operating supply range must match the system rail to avoid level shifting or regulator changes. |
| Reference Input | External | External | Both require an external reference, so the reference source and its accuracy budget remain the same. |
| Output Type | Voltage output | Voltage output | Voltage-output DACs drive loads directly without external I-to-V conversion, simplifying the analog front end. |
| Package / Mounting | 20-Lead SOIC (surface mount) | 20-Lead SOIC (surface mount) | Identical package and footprint allow drop-in replacement without PCB redesign. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ratings ensure both parts meet the same environmental and reliability requirements. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7945BRZ | AD7948BR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| 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 | Parallel |
| 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 primary differences between the AD7945BRZ and AD7948BR?
The AD7945BRZ is a 12-bit multiplying DAC with a parallel interface, while the AD7948BR is a 12-bit multiplying DAC with a serial (SPI-compatible) interface. Both are 12-bit CMOS multiplying DACs in a 20-lead SOIC package, but they differ in digital interface type and related pin functions.
Are the AD7945BRZ and AD7948BR pin-compatible?
No. Although both are offered in a 20-lead SOIC (R-20) package, the pin functions differ because the AD7945BRZ uses a parallel data interface and the AD7948BR uses a serial interface. The digital input pins and control pins are not interchangeable, so they cannot be treated as drop-in replacements.
Do the AD7945BRZ and AD7948BR have the same resolution and DAC architecture?
Yes. Both are 12-bit CMOS multiplying digital-to-analog converters with a current-output R-2R ladder architecture. Both provide 12-bit resolution and are specified for multiplying operation with an external reference input.
What digital interface does the AD7945BRZ use compared with the AD7948BR?
The AD7945BRZ uses a parallel 12-bit data interface with chip-select and write control signals. The AD7948BR uses a serial interface compatible with SPI, QSPI, and MICROWIRE, allowing data to be clocked in serially. The interface choice is the main selection criterion between the two parts.
Are the AD7945BRZ and AD7948BR specified for the same supply voltage and reference range?
Both are designed for 5 V operation with an external reference input, consistent with the AD7945/AD7948 family datasheet specifications. Designers should confirm the exact supply and reference limits in the respective manufacturer datasheet before finalizing a design.
Can the AD7945BRZ be replaced by the AD7948BR in an existing design?
Not directly. Because the digital interface differs (parallel versus serial), replacing one with the other requires PCB layout changes, different microcontroller or DSP interface wiring, and firmware changes. A direct substitution without redesign is not possible.
What package do the AD7945BRZ and AD7948BR use?
Both devices are available in a 20-lead SOIC package (R-20 suffix in the ordering code). The "BRZ" and "BR" suffixes indicate the SOIC package and grade; designers should verify the exact package and temperature grade in the manufacturer ordering guide.