Part A
AD7392ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2297 PCS
- Package
- SOIC-20
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Not a drop-in replacement
The AD7392ARZ and AD7399BRZ are not drop-in replacements for one another. They differ in resolution, channel count, digital interface, and reference architecture, so substituting one for the other requires a full circuit redesign and firmware update rather than a direct swap.
Different resolution
Different channel count
Different digital interface
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 | AD7392ARZ | AD7399BRZ | Why it matters |
|---|---|---|---|
| Resolution | 12 bits | 10 bits | Resolution determines the number of discrete output levels; a 12-bit DAC provides 4x finer adjustment granularity than a 10-bit DAC, affecting precision of the analog output. |
| Number of DAC Channels | 1 | 4 | Channel count defines how many independent analog outputs are available; a quad DAC can replace four single DACs, affecting board space and system architecture. |
| Digital Interface | Parallel | SPI (serial) | The interface type determines the host connection and pin count; parallel offers faster updates while serial reduces pin count and simplifies routing. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Supply range indicates compatibility with the system power rail; both parts support the same low-voltage range, easing power design. |
| INL (Integral Nonlinearity) | ±1 LSB (typ) | ±0.5 LSB (typ) | INL measures deviation from an ideal transfer function; lower INL yields more accurate absolute output, important for precision control loops. |
| DNL (Differential Nonlinearity) | ±1 LSB (max) | ±0.5 LSB (max) | DNL indicates step-size uniformity and guarantees monotonicity; tighter DNL ensures no missing codes and smoother output transitions. |
| Settling Time | 7 µs | 6 µs | Settling time limits the maximum update rate; faster settling enables higher-speed control and waveform generation. |
| Package | 20-Lead SOIC (W) | 16-Lead SOIC (W) | Package footprint affects PCB layout and assembly; differing pin counts and body sizes require layout changes when substituting. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +105 °C | Temperature range defines environmental robustness; the wider range of the AD7399BRZ suits harsher industrial environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7392ARZ | AD7399BRZ |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 12 | - |
| Number of D/A Converters | 1 | - |
| Settling Time | 70µs (Typ) | - |
| Output Type | Voltage - Buffered | - |
| Differential Output | No | - |
| Data Interface | Parallel | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | - |
| INL / DNL(LSB) | ±3 (Max), ±1 (Max) | - |
| Architecture | R-2R | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key architectural differences between the AD7392ARZ and AD7399BRZ?
The AD7392ARZ is a 12-bit voltage-output digital-to-analog converter (DAC) with a single channel, while the AD7399BRZ is a quad, 10-bit voltage-output DAC. The AD7392ARZ offers higher resolution (12-bit) in a single-channel configuration, whereas the AD7399BRZ provides four independent 10-bit DAC channels in one package.
Do the AD7392ARZ and AD7399BRZ use the same digital interface?
Both devices use a serial SPI-compatible interface. However, the AD7399BRZ includes a daisy-chain output (SDO) for cascading multiple devices, while the AD7392ARZ does not provide a daisy-chain output. The AD7399BRZ also includes a LDAC pin for simultaneous updating of all DAC registers, which the AD7392ARZ does not have.
Are the AD7392ARZ and AD7399BRZ pin-compatible or package-compatible?
No. The AD7392ARZ is offered in a 20-lead SOIC (R-20) package, while the AD7399BRZ is offered in a 16-lead SOIC (R-16) package. The pin counts and pin functions differ, so they are not drop-in replacements for each other.
What are the supply voltage and reference requirements for these DACs?
Both the AD7392ARZ and AD7399BRZ operate from a single 2.7 V to 5.5 V supply. Each device requires an external reference voltage applied to its VREF pin to set the output voltage range. The output span is determined by the applied reference voltage.
How do the settling times and output drive capabilities compare?
The AD7392ARZ (12-bit) has a typical settling time of 6 µs to ±1 LSB. The AD7399BRZ (10-bit) has a typical settling time of 6 µs as well. Both devices feature rail-to-rail output amplifiers capable of driving resistive and capacitive loads, with specified output voltage swing to within millivolts of the supply rails.
Which device is better suited for multi-channel applications?
The AD7399BRZ is better suited for multi-channel applications because it integrates four independent 10-bit DACs in a single 16-lead package, reducing board space and component count. The AD7392ARZ provides only one 12-bit channel, so multi-channel systems would require multiple devices.
What are the operating temperature ranges for the AD7392ARZ and AD7399BRZ?
Both the AD7392ARZ and AD7399BRZ are specified for the industrial temperature range of −40°C to +85°C. Both are available in Pb-free, RoHS-compliant SOIC packages as indicated by the "Z" suffix in the part numbers.