Part A
AD5321BRMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3782 PCS
- Package
- MSOP-8
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Not a drop-in replacement
The AD5321BRMZ and AD5322ARM are not drop-in replacements for each other. Although both are 12-bit DACs from Analog Devices, they differ in channel count, digital interface type, package footprint, and reference architecture, requiring design changes and firmware modifications before substitution can be considered.
Different channel count
Different digital interface
Different package footprint
Different reference 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 | AD5321BRMZ | AD5322ARM | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 1 | 2 | Channel count determines how many independent analog outputs the system can drive; a single-channel device cannot directly replace a dual-channel one without redesign. |
| Resolution | 12 bits | 12 bits | Resolution sets the smallest analog output step; matching resolution preserves output precision and control-loop accuracy. |
| Interface Type | I2C (2-wire) | SPI (3-wire) | The digital interface must match the host controller; I2C and SPI are not pin- or protocol-compatible, so substitution requires firmware and wiring changes. |
| Package / Mounting | 8-Lead MSOP | 10-Lead MSOP | Different package footprints and pin counts prevent drop-in board replacement and require layout changes. |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | Compatible supply ranges allow both parts to operate from the same system rail without additional regulation. |
| Output Type | Voltage output, buffered | Voltage output, buffered | Buffered voltage outputs drive loads directly; matching output type preserves signal-chain behavior. |
| Reference Input | External reference | External reference | Both require an external reference, so the same reference source and decoupling can be reused. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +85 °C | The narrower temperature range of the AD5322ARM may limit use in industrial or automotive environments requiring extended temperature operation. |
| INL (Integral Nonlinearity) | ±1 LSB max | ±1 LSB max | INL defines absolute accuracy of the transfer function; matching INL ensures equivalent static performance. |
| Power-Down Current | 0.2 µA typ | 0.2 µA typ | Low power-down current is critical for battery-powered and energy-sensitive designs; equivalent values preserve power budget. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5321BRMZ | AD5322ARM |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Number of D/A Converters | 1 | 2 |
| 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 | ±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 AD5321BRMZ and AD5322ARM?
The AD5321BRMZ is a single-channel, 12-bit voltage-output DAC in a 10-lead MSOP package, while the AD5322ARM is a dual-channel, 12-bit voltage-output DAC in a 10-lead MSOP package. The AD5321BRMZ has one DAC output, whereas the AD5322ARM has two DAC outputs. Both operate from a 2.5 V to 5.5 V supply and use an I2C-compatible serial interface.
Are the AD5321BRMZ and AD5322ARM pin-compatible?
No. Although both devices are offered in a 10-lead MSOP package, their pinouts differ because the AD5321BRMZ is a single-channel DAC and the AD5322ARM is a dual-channel DAC. The AD5322ARM requires additional pins for the second DAC output and related functions. They are not direct pin-for-pin replacements.
What is the resolution and output type of the AD5321BRMZ and AD5322ARM?
Both the AD5321BRMZ and AD5322ARM are 12-bit voltage-output digital-to-analog converters. They provide a buffered voltage output capable of driving a load to either ground or VDD, depending on the output amplifier configuration and reference connection.
What supply voltage range do the AD5321BRMZ and AD5322ARM support?
Both devices operate from a single supply voltage of 2.5 V to 5.5 V. The reference input voltage range and output voltage span depend on the applied reference and supply configuration, as specified in the respective manufacturer datasheets.
What serial interface do the AD5321BRMZ and AD5322ARM use?
Both the AD5321BRMZ and AD5322ARM use a 2-wire I2C-compatible serial interface. They support standard (100 kHz) and fast (400 kHz) mode operation, and the AD5322ARM includes additional address pins to allow multiple devices on the same bus.
Can the AD5321BRMZ be used as a drop-in replacement for the AD5322ARM in an existing design?
No. The AD5321BRMZ is a single-channel DAC, while the AD5322ARM is a dual-channel DAC. A drop-in replacement would require the design to use only one DAC channel and to accommodate the different pinout. The PCB layout, pin functions, and channel count must be validated against the manufacturer datasheets before substitution.
What are the package and operating temperature ranges for the AD5321BRMZ and AD5322ARM?
Both the AD5321BRMZ and AD5322ARM are available in a 10-lead MSOP package. The operating temperature range for both devices is typically −40°C to +105°C, as specified in the manufacturer datasheets. The "BRMZ" and "ARM" suffixes indicate specific package and temperature grade options.
Do the AD5321BRMZ and AD5322ARM include an internal reference?
No. Neither the AD5321BRMZ nor the AD5322ARM includes an internal voltage reference. Both devices require an external reference voltage applied to the REF pin to set the full-scale output voltage. The reference input range and input impedance are specified in the respective datasheets.