Part A
AD7945BRZ
ADI公司
- Lifecycle
- Active
- Stock
- 3622 件
- Package
- SOIC-20
- Series
- 資料獲取-數模轉換器（DAC）
Replacement verdict
Compatible functional replacement candidate
The AD7945BRZ and AD7943BR are both 12-bit multiplying DACs from Analog Devices in a 20-lead SOIC package, sharing the same resolution, architecture, and supply requirements. The AD7945BRZ offers a parallel interface while the AD7943BR uses a serial interface, so the two are functionally similar but not pin-for-pin interchangeable; designers must account for the differing digital interface and reference configuration before substituting one for the other.
Resolution
High match
Package Type
High match
Digital Interface
Validation required
Reference Configuration
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 | AD7943BR | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | 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 | Serial (SPI/QSPI/MICROWIRE compatible) | The interface type differs fundamentally; a parallel interface cannot be dropped into a serial bus design without rework. |
| Supply Voltage (VDD) | 3.3 V to 5 V | 3.3 V to 5 V | Both operate over the same supply range, so power rail compatibility is maintained. |
| Reference Type | External | External | Both require an external voltage reference, so reference circuitry can be reused. |
| Output Type | Current output (unbuffered) | Current output (unbuffered) | Matching current-output topology means the external op-amp/output stage can remain unchanged. |
| Settling Time | 0.6 µs (to 1/2 LSB) | 0.6 µs (to 1/2 LSB) | Identical settling time preserves dynamic performance in the target application. |
| Package / Mounting | 20-Lead SOIC (surface mount) | 20-Lead SOIC (surface mount) | Same package and footprint allow physical board compatibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent temperature ratings ensure the part meets the same environmental requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7945BRZ | AD7943BR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,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?
The AD7945BRZ and AD7943BR are both 12-bit, 5 V, unbuffered multiplying DACs from Analog Devices, but they differ in their digital interface and package. The AD7945BRZ provides a 12-bit parallel interface and is supplied in a 20-lead SOIC (R-20) package, while the AD7943BR provides a serial (SPI-compatible) interface and is supplied in a 16-lead SOIC (R-16) package. Both are specified for the -40 °C to +85 °C industrial temperature range and are available in B-grade accuracy.
Are the AD7945BRZ and AD7943BR pin-compatible?
No. The AD7945BRZ uses a 20-lead SOIC package with a parallel data bus, while the AD7943BR uses a 16-lead SOIC package with a serial interface. The different pin counts and pin functions mean they are not drop-in replacements for one another and require different PCB layouts.
Do the AD7945BRZ and AD7943BR have the same resolution and accuracy grade?
Yes. Both are 12-bit multiplying DACs offered in the B grade, which specifies ±1 LSB integral nonlinearity (INL) and ±1 LSB differential nonlinearity (DNL) over the specified temperature range, according to the Analog Devices datasheets.
What is the digital interface of each device?
The AD7945BRZ has a 12-bit parallel data input interface, making it suitable for direct connection to a microprocessor bus. The AD7943BR uses a serial interface compatible with SPI, QSPI, and MICROWIRE, which reduces pin count and simplifies isolation in some designs.
Can the AD7945BRZ and AD7943BR operate from the same supply voltage?
Yes. Both devices are specified for operation from a single +5 V supply (with a ±10% tolerance) and are multiplying DACs that accept a reference input of up to ±10 V, allowing four-quadrant multiplication.
Which device should be chosen for a design with limited board space?
The AD7943BR is typically preferred when board space is constrained because its serial interface and 16-lead SOIC package require fewer pins and a smaller footprint than the 20-lead parallel-interface AD7945BRZ. The trade-off is that serial data transfer may be slower than a parallel bus for high update-rate applications.
Are the AD7945BRZ and AD7943BR interchangeable in an existing design?
No. Because they differ in package, pin count, and digital interface (parallel versus serial), they cannot be interchanged without redesigning the PCB and adapting the host controller's interface. Any substitution must be validated against the Analog Devices datasheets for the specific design.