Part A
AD5320BRMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 3563 個数
- Package
- MSOP-8
- Series
- データ取得 - デジタル/アナログコンバータ (DAC)
Replacement verdict
Not a drop-in replacement
The AD5320BRMZ and AD5325ARM are not functionally interchangeable. The AD5320BRMZ is a single-channel 12-bit DAC in an MSOP-8 package, while the AD5325ARM is a quad-channel 12-bit DAC in an MSOP-10 package. They differ in channel count, package footprint, pin configuration, and digital interface architecture, requiring a complete PCB redesign and firmware modification for substitution.
Different channel count
Different package footprint
Different pin configuration
Different interface architecture
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5320BRMZ | AD5325ARM | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 1 | 4 | Determines how many independent analog outputs are available; a single-channel device cannot replace a quad-channel device in multi-output designs. |
| Resolution | 12 bits | 12 bits | Both provide 12-bit resolution, so output granularity and accuracy are equivalent for precision setpoint applications. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible | I2C compatible (2-wire) | The serial protocol must match the host controller; SPI and I2C are not directly interchangeable without a bus conversion. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.5 V to 5.5 V | Defines the allowable power supply window; the AD5325ARM supports a slightly lower minimum supply, affecting low-voltage system compatibility. |
| Package / Mounting | 8-Lead MSOP | 10-Lead MSOP | Footprint and pin count differ, so the PCB layout and land pattern are not drop-in compatible. |
| Reference Type | External reference | External reference | Both require an external reference, so output full-scale range depends on the same external reference design approach. |
| Output Type | Voltage output, buffered | Voltage output, buffered | Both provide buffered voltage outputs, so they can drive similar loads without external output amplifiers. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +105 °C | Identical industrial temperature ratings mean both are suitable for the same harsh-environment applications. |
| Power-Down / Shutdown Feature | Yes, with software programmable modes | Yes, with software programmable modes | Both support low-power shutdown, which is important for battery-powered or power-sensitive designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5320BRMZ | AD5325ARM |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Number of D/A Converters | 1 | 4 |
| Settling Time | 10µs | 10µs |
| Output Type | Voltage - Buffered | Voltage - Buffered |
| Differential Output | No | No |
| Data Interface | SPI, DSP | I²C |
| Reference Type | Supply | External |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 2.5V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.5V ~ 5.5V |
| INL / DNL(LSB) | ±16 (Max), ±1 (Max) | ±2, ±0.2 |
| Architecture | String DAC | String DAC |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
Frequently asked questions
What are the key differences between the AD5320BRMZ and the AD5325ARM?
The AD5320BRMZ is a single-channel, 12-bit voltage-output DAC in a 10-lead MSOP package, while the AD5325ARM is a quad-channel, 12-bit voltage-output DAC in a 10-lead MSOP package. The AD5320 offers one DAC output, whereas the AD5325 integrates four DAC outputs, making the AD5325 suitable for multi-channel applications requiring multiple independent voltage outputs.
Do the AD5320BRMZ and AD5325ARM have the same resolution and interface type?
Yes, both devices are 12-bit DACs and use a 3-wire SPI-compatible serial interface. However, the AD5320BRMZ supports a maximum update rate of 125 kSPS, while the AD5325ARM supports a maximum update rate of 125 kSPS per channel. The digital interface timing and register structure differ due to the channel count difference.
Can the AD5320BRMZ and AD5325ARM operate from the same supply voltage range?
Both devices operate from a single 2.5 V to 5.5 V supply. The AD5320BRMZ is specified for operation from 2.5 V to 5.5 V, and the AD5325ARM is also specified for 2.5 V to 5.5 V. However, the AD5325ARM includes a power-on reset circuit that resets all DAC outputs to zero scale, while the AD5320BRMZ powers up to zero scale as well.
Are the AD5320BRMZ and AD5325ARM pin-compatible in the same package?
No, they are not pin-compatible. Although both are offered in a 10-lead MSOP package, the pin functions differ. The AD5320BRMZ has pins for VOUT, VREF, SYNC, SCLK, DIN, and power supplies, while the AD5325ARM has four VOUT pins, one VREF pin, and different digital control pins. Therefore, they cannot be used as drop-in replacements without PCB redesign.
Which device is more suitable for applications requiring multiple independent voltage outputs?
The AD5325ARM is more suitable for multi-channel applications because it provides four independent 12-bit DAC outputs in a single package. The AD5320BRMZ provides only one DAC output, so multiple AD5320 devices would be required to achieve the same number of channels, increasing board space and cost.
Do both the AD5320BRMZ and AD5325ARM include an internal reference?
No, neither the AD5320BRMZ nor the AD5325ARM includes an internal voltage reference. Both devices require an external reference voltage applied to the VREF pin to set the DAC output range. The output voltage is determined by the external reference and the digital code programmed into the DAC register.
What are the operating temperature ranges for the AD5320BRMZ and AD5325ARM?
Both the AD5320BRMZ and AD5325ARM are specified for operation over the industrial temperature range of −40°C to +105°C. This makes them suitable for industrial and automotive applications where extended temperature operation is required.
Can the AD5325ARM be used as a direct substitute for the AD5320BRMZ in an existing design?
No, the AD5325ARM cannot be used as a direct substitute for the AD5320BRMZ. The AD5325ARM has four DAC channels and a different pinout, while the AD5320BRMZ has one DAC channel. A direct replacement would require significant hardware and software changes, including PCB layout modifications and firmware updates to address the additional channels and different register map.