Part A
AD7945BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3622 Stückzahl
- Package
- SOIC-20
- Series
- Data Acquisition von Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD7945BRZ and AD7948BRZ-REEL are functionally compatible 12-bit multiplying DACs sharing the same package, reference architecture, and supply requirements, making them viable substitutes in most designs. The primary distinction is the digital interface configuration, which requires validation against the host system's timing and logic-level requirements before substitution.
Resolution and DAC Architecture
High match
Package Type
High match
Digital Interface Type
Validation required
Supply Voltage Range
High match
Parts at a glance
Part B
AD7948BRZ-REEL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5544 Stückzahl
- Package
- SOIC-20
- Series
- Data Acquisition von Digital to Analog Converters (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 | AD7948BRZ-REEL | Why it matters |
|---|---|---|---|
| Resolution (bits) | 12 | 12 | Both are 12-bit DACs, so resolution is identical and does not affect substitutability. |
| Number of DAC channels | 1 | 1 | Single-channel architecture in both parts; channel count matches for direct replacement. |
| Digital interface | Parallel | Parallel | Both use a parallel interface, so the host bus timing and pinout requirements are compatible. |
| Supply voltage (VDD) | 3.3 V to 5.5 V | 3.3 V to 5.5 V | Identical supply range means either part can operate in the same power rail design. |
| Reference type | External | External | Both require an external reference, so the reference circuit can be reused unchanged. |
| Package / mounting | 20-lead SOIC (surface mount) | 20-lead SOIC (surface mount) | Same package and footprint allow drop-in board replacement without layout changes. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ratings ensure equivalent environmental performance in the same application. |
| Settling time | 5 µs (typical) | 5 µs (typical) | Equivalent settling time means dynamic response and update rate behavior are interchangeable. |
| Packaging format | Tube / tray | Tape and reel | Different packaging formats affect automated assembly handling but not electrical function. |
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 | AD7948BRZ-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Active |
| 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 key differences between the AD7945BRZ and AD7948BRZ-REEL?
The AD7945BRZ and AD7948BRZ-REEL are both 12-bit multiplying DACs from Analog Devices in a 20-lead SOIC package, but they differ in digital interface and packaging format. The AD7945BRZ uses a parallel 12-bit interface, while the AD7948BRZ-REEL uses a serial (SPI-compatible) interface. The "-REEL" suffix indicates the AD7948BRZ is supplied on tape and reel for automated assembly, whereas the AD7945BRZ is typically supplied in tube form.
Are the AD7945BRZ and AD7948BRZ-REEL pin-compatible?
No. Although both are 20-lead SOIC devices, the AD7945BRZ uses a parallel data interface requiring multiple data pins, while the AD7948BRZ-REEL uses a serial interface with SDIN, SCLK, and SYNC pins. The pin functions and assignments differ, so they are not drop-in replacements for each other.
Do both parts have the same resolution and DAC architecture?
Yes. Both the AD7945BRZ and AD7948BRZ-REEL are 12-bit multiplying digital-to-analog converters with a current-output R-2R ladder architecture, offering the same resolution and multiplying bandwidth characteristics per the Analog Devices datasheets.
What supply voltage and reference requirements apply to these DACs?
Both devices operate from a single +5 V supply (with specified ranges per the datasheet) and use an external reference voltage to set the output current. The reference input range and multiplying bandwidth should be verified against the respective Analog Devices datasheets for the AD7945 and AD7948.
Which part should be selected for a design with limited microcontroller I/O pins?
The AD7948BRZ-REEL is preferable when I/O pins are limited, because its serial interface requires only a few control lines (SDIN, SCLK, SYNC) versus the parallel 12-bit bus of the AD7945BRZ. The AD7945BRZ is better suited to systems with a parallel bus and higher update throughput requirements.
Why is the AD7948BRZ offered with a "-REEL" suffix?
The "-REEL" suffix denotes tape-and-reel packaging, which is intended for high-volume automated pick-and-place assembly lines. The AD7945BRZ is typically supplied in tube packaging. The electrical specifications of the AD7948BRZ-REEL are the same as the standard AD7948BRZ; only the packaging format differs.
Are both parts specified over the same operating temperature range?
Both the AD7945BRZ and AD7948BRZ-REEL are specified for the industrial temperature range of -40°C to +85°C, as indicated by the "B" grade designation in the part number. Confirm the exact temperature specification in the respective Analog Devices datasheets before final design.