Part A
AD5321BRM
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 97 PCS
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
Replacement verdict
Not a drop-in replacement
The AD5324BRMZ and AD5321BRM are not drop-in replacements for each other. The AD5324BRMZ is a quad 12-bit DAC with a serial interface and internal reference, while the AD5321BRM is a single 12-bit DAC with a different package and pinout. Their channel count, package type, and reference architecture differ fundamentally, requiring circuit redesign and layout changes for substitution.
Different channel count
Different package type
Different reference architecture
Different pinout
Parts at a glance
Part B
AD5324BRMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6981 PCS
- Package
- MSOP-10
- Series
- Acquisição de dados - Convertedores digitais para analógicos (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 | AD5324BRMZ | AD5321BRM | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 4 | 1 | Determines how many independent analog outputs are available; a 4-channel device cannot be substituted by a 1-channel device without redesigning the output stage. |
| Resolution | 12 bits | 12 bits | Resolution sets the smallest analog step size; matching resolution preserves output accuracy and control loop precision. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible | I2C (2-wire) | The digital interface must match the host controller; SPI and I2C are not pin- or protocol-compatible, so substitution requires firmware and wiring changes. |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | Both parts operate over the same supply window, allowing use in common 3 V and 5 V systems without level shifting. |
| Output Voltage Range | 0 V to VREF (buffered) | 0 V to VREF (buffered) | Matching output span ensures the analog signal swing remains compatible with downstream circuitry. |
| Reference Input | External reference | External reference | Both require an external reference, so the same reference source can be reused, simplifying substitution. |
| Package | 10-lead MSOP | 8-lead MSOP | Different pin counts and footprints prevent drop-in replacement; the PCB layout must be revised. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +105 °C | Identical temperature ratings ensure both parts suit the same industrial and automotive environments. |
| Power-Down Mode | Yes (software programmable) | Yes (software programmable) | Power-down capability reduces standby current, which is important for battery-powered and low-power designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5321BRM | AD5324BRMZ |
|---|---|---|
| Part Status | Obsolete | Active |
| Number of Bits | 12 | 12 |
| Number of D / A Converters | 1 | - |
| Settling Time | 10µs | 10µs |
| Output Type | Voltage - Buffered | Voltage - Buffered |
| Differential Output | No | No |
| Data Interface | I2C | SPI, DSP |
| Reference Type | Supply | External |
| Voltage - Supply, Analog | 2.5V ~ 5.5V | 2.5V ~ 5.5V |
| Voltage - Supply, Digital | 2.5V ~ 5.5V | 2.5V ~ 5.5V |
| INL / DNL (LSB) | ±2, ±0.3 | - |
| Architecture | String DAC | String DAC |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
| Mounting Type | Surface Mount | - |
| Base Product Number | AD5321 | - |
| Number of D/A Converters | - | 4 |
| INL / DNL(LSB) | - | ±2, ±0.2 |
Frequently asked questions
What are the key differences between the AD5324BRMZ and the AD5321BRM?
The AD5324BRMZ is a quad 12-bit digital-to-analog converter (DAC) with a serial interface, while the AD5321BRM is a single 12-bit DAC with a serial interface. The AD5324BRMZ provides four independent DAC channels in a 10-lead MSOP package, whereas the AD5321BRM provides one DAC channel in an 8-lead MSOP package. Both operate from a 2.5 V to 5.5 V supply and offer similar performance per channel, but the AD5324BRMZ integrates four times the channel count.
Are the AD5324BRMZ and AD5321BRM pin-compatible or package-compatible?
No. The AD5324BRMZ is supplied in a 10-lead MSOP (RM-10) package, while the AD5321BRM is supplied in an 8-lead MSOP (RM-8) package. They have different pin counts and pinouts, so they are not drop-in replacements for each other. PCB land patterns and pin functions differ between the two devices.
Can the AD5324BRMZ and AD5321BRM operate from the same power supply voltage?
Yes. Both devices are specified for operation from a single supply of 2.5 V to 5.5 V. The AD5324BRMZ and AD5321BRM both support this supply range, making them suitable for low-voltage, single-supply applications. However, the AD5324BRMZ draws supply current for four DAC channels, while the AD5321BRM draws current for only one channel, so total power consumption differs accordingly.
Do the AD5324BRMZ and AD5321BRM have the same resolution and DAC architecture?
Yes. Both are 12-bit voltage-output DACs with a resistor-string architecture. Each provides 12-bit resolution and a guaranteed monotonic output. The AD5324BRMZ contains four such DACs, and the AD5321BRM contains one. The per-channel resolution and architecture are identical, but the channel count differs.
What serial interface do the AD5324BRMZ and AD5321BRM use?
Both devices use a 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP interface standards. The interface operates at clock rates up to 30 MHz. The AD5324BRMZ requires additional address bits to select among its four DAC channels, while the AD5321BRM has a single channel and does not require channel addressing.
Do the AD5324BRMZ and AD5321BRM include an internal reference?
No. Neither the AD5324BRMZ nor the AD5321BRM includes an internal voltage reference. Both require an external reference voltage applied to the REF pin to set the DAC output range. The output voltage is determined by the external reference and the digital code loaded into the DAC register.
What are the operating temperature ranges for the AD5324BRMZ and AD5321BRM?
Both the AD5324BRMZ and AD5321BRM are specified for operation over the industrial temperature range of −40°C to +105°C. This makes them suitable for industrial and automotive-adjacent applications within that range. Always confirm the exact temperature grade from the official manufacturer datasheet for the specific orderable part number.
Can the AD5324BRMZ be used as a direct substitute for the AD5321BRM in an existing design?
No, not as a direct substitute. The AD5324BRMZ has a different package (10-lead MSOP vs 8-lead MSOP), a different pinout, and four DAC channels instead of one. While the per-channel electrical performance is similar, the physical and functional differences prevent a drop-in replacement. A redesign of the PCB layout and firmware would be required to use the AD5324BRMZ in place of the AD5321BRM.