Part A
AD7392ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2297 PCS
- Package
- SOIC-20
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD7392ARZ and AD7391AR are both 12-bit voltage-output DACs from Analog Devices in a 14-lead SOIC package, sharing the same supply range, reference input architecture, and serial interface family. The AD7392ARZ offers a higher full-scale output span and faster settling, while the AD7391AR provides a lower full-scale output range. Both are functionally interchangeable in many designs, but the output voltage range and dynamic performance differences should be validated against the target application requirements before substitution.
Resolution
High match
Package Type
High match
Output Voltage Range
Validation required
Settling Time
Validation required
Parts at a glance
Part B
AD7391AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6553 PCS
- Package
- SOIC-8
- 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 | AD7392ARZ | AD7391AR | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 10 bit | Resolution determines the number of discrete output levels; a 12-bit DAC offers 4x finer granularity than a 10-bit DAC, affecting precision of the analog output. |
| Number of DAC Channels | 1 | 1 | Both are single-channel DACs, so channel count does not differentiate them for substitution purposes. |
| Interface Type | Serial (SPI-compatible, 3-wire) | Serial (SPI-compatible, 3-wire) | Matching serial interface ensures the same microcontroller or host can drive either part without protocol changes. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Identical supply range means both parts operate in the same system power domains, simplifying substitution. |
| INL (Integral Nonlinearity) | ±1 LSB (typ) | ±0.5 LSB (typ) | INL indicates deviation from an ideal transfer function; the 10-bit part specifies tighter relative linearity, which can affect accuracy in precision applications. |
| DNL (Differential Nonlinearity) | ±1 LSB (typ) | ±0.5 LSB (typ) | DNL affects monotonicity and step-size uniformity; tighter DNL in the 10-bit part can matter for closed-loop control stability. |
| Settling Time | 6 µs (typ) | 6 µs (typ) | Settling time governs how fast the output reaches its final value; identical values mean similar dynamic response in both parts. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching temperature ranges ensure both parts are suitable for the same industrial-grade environments. |
| Package / Pin Count | 8-lead SOIC (SOIC_N) | 8-lead SOIC (SOIC_N) | Package and pinout compatibility is essential for drop-in substitution on an existing PCB footprint. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7392ARZ | AD7391AR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 10 |
| Number of D/A Converters | 1 | 1 |
| Settling Time | 70µs (Typ) | 70µs (Typ) |
| Output Type | Voltage - Buffered | Voltage - Buffered |
| Differential Output | No | No |
| Data Interface | Parallel | SPI |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| INL / DNL(LSB) | ±3 (Max), ±1 (Max) | ±2 (Max), ±0.9 (Max) |
| Architecture | R-2R | R-2R |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the AD7392ARZ and AD7391AR?
The AD7392ARZ is a 12-bit voltage-output digital-to-analog converter, while the AD7391AR is a 10-bit voltage-output DAC. Both are single-channel, serial-input DACs from Analog Devices in 8-lead SOIC packages, but they differ in resolution (12-bit vs 10-bit), which affects their LSB size and effective precision in a given reference configuration.
Are the AD7392ARZ and AD7391AR pin-compatible?
Yes. Both devices are offered in an 8-lead SOIC (R-8) package with the same pinout, allowing the AD7392ARZ and AD7391AR to be used in the same PCB footprint. Designers should still verify the surrounding circuit tolerances because the resolution difference changes the LSB weight.
What is the resolution and LSB size of each device?
The AD7392ARZ provides 12-bit resolution, giving an LSB of VREF/4096. The AD7391AR provides 10-bit resolution, giving an LSB of VREF/1024. For the same reference voltage, the AD7392ARZ therefore offers four times finer output steps than the AD7391AR.
Do both parts use the same serial interface?
Yes. Both the AD7392ARZ and AD7391AR use a 3-wire serial interface compatible with SPI, QSPI, and MICROWIRE, with serial data, clock, and load/latch signals. This allows either device to be driven by the same microcontroller or DSP serial port.
What supply voltage and reference range do these DACs support?
Both the AD7392ARZ and AD7391AR operate from a single +2.7 V to +5.5 V supply and accept an external reference voltage that sets the full-scale output. The output amplifier swings from 0 V to VREF, so the reference choice directly determines the output span for both parts.
Can the AD7391AR be replaced by the AD7392ARZ in an existing design?
Because they share the same package, pinout, and serial interface, the AD7392ARZ can generally be placed in an AD7391AR socket. However, the higher 12-bit resolution changes the digital code-to-output relationship, so firmware scaling and any code-dependent calibration must be revalidated before substitution.
Which part should be selected for higher-precision applications?
The AD7392ARZ should be selected when finer output resolution is required, since its 12-bit architecture provides 4096 output levels versus 1024 levels for the 10-bit AD7391AR. The AD7391AR may be sufficient where 10-bit precision meets the system error budget.