Part A
AD5318ARU
ADI公司
- Lifecycle
- Active
- Stock
- 1529 件
- Package
- TSSOP-16
- Series
- 資料獲取-數模轉換器（DAC）
Replacement verdict
Compatible functional replacement candidate
The AD5318ARU and AD5317ARU are functionally compatible octal and quad 10-bit voltage-output DACs from the same Analog Devices AD53xx family, sharing an identical TSSOP-16 footprint, SPI interface, and 2.5 V to 5.5 V supply range. The AD5318ARU integrates eight DAC channels while the AD5317ARU provides four, so the AD5318ARU can directly substitute for the AD5317ARU in existing sockets when the additional channels are left unconnected or repurposed, provided the system firmware accounts for the differing channel count and register map.
Channel Count
Validation required
Package Type
High match
Resolution
High match
Supply Voltage
High match
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5318ARU | AD5317ARU | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 8 | 4 | Determines how many independent analog outputs are available; a direct functional substitutability constraint. |
| Resolution | 10 bits | 10 bits | Sets the output voltage step size and achievable precision; must match for equivalent performance. |
| Interface Type | SPI / DSP-compatible serial | SPI / DSP-compatible serial | Defines the digital communication protocol required by the host controller. |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | Determines compatibility with the system power rail and output voltage headroom. |
| Output Voltage Range | 0 V to VREF | 0 V to VREF | Defines the usable analog output span relative to the applied reference voltage. |
| Reference Input | External | External | Affects accuracy, drift, and the need for an external reference circuit. |
| Package | 16-Lead TSSOP | 16-Lead TSSOP | Determines PCB footprint and thermal/mechanical compatibility for drop-in replacement. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +105 °C | Ensures the device meets the environmental requirements of the target application. |
| INL (Integral Nonlinearity) | ±0.5 LSB | ±0.5 LSB | Indicates absolute accuracy of the DAC transfer function; critical for precision applications. |
| DNL (Differential Nonlinearity) | ±0.5 LSB | ±0.5 LSB | Guarantees monotonicity and absence of missing codes in the DAC output. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5318ARU | AD5317ARU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| Number of Bits | 10 | 10 |
| Number of D/A Converters | 8 | 4 |
| Settling Time | 9µs | 9µs |
| Output Type | Voltage - Buffered | Voltage - Buffered |
| Differential Output | No | No |
| Data Interface | SPI, DSP | SPI, DSP |
| Reference Type | External | 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) | ±0.5, ±0.05 | ±0.5, ±0.05 |
| Architecture | String DAC | String DAC |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 105°C |
Frequently asked questions
What are the key differences between the AD5318ARU and AD5317ARU?
The AD5318ARU is an octal 10-bit DAC, while the AD5317ARU is a quad 10-bit DAC. Both are members of the Analog Devices AD531x family and share the same 10-bit resolution, serial interface, and TSSOP-16 package, but the AD5318 provides eight DAC channels whereas the AD5317 provides four.
Are the AD5318ARU and AD5317ARU pin-compatible?
No. Although both devices are offered in a 16-lead TSSOP package, the AD5318ARU uses the additional pins to provide four extra DAC outputs and associated reference inputs. The pin functions and PCB land pattern connections differ, so they are not direct drop-in replacements.
Do the AD5318ARU and AD5317ARU have the same digital interface?
Yes. Both devices use a 3-wire serial interface compatible with SPI, QSPI, MICROWIRE, and DSP interface standards, operating at clock rates up to 30 MHz. The interface protocol and register structure are consistent across the AD531x family.
What is the resolution and architecture of the AD5318ARU and AD5317ARU?
Both are 10-bit voltage-output DACs using a string DAC architecture. They offer guaranteed monotonicity and operate from a single 2.5 V to 5.5 V supply.
Can the AD5317ARU be used as a substitute for the AD5318ARU in an existing design?
Only if the design requires no more than four DAC channels and the PCB layout is revised to accommodate the different pinout. The AD5317ARU cannot directly replace the AD5318ARU where eight channels are needed, and the differing pin functions prevent a drop-in substitution without layout changes.
What are the reference input configurations for the AD5318ARU and AD5317ARU?
The AD5318ARU provides separate reference inputs for each group of DACs, allowing independent reference voltages per channel group. The AD5317ARU has a single reference input pin that serves all four DAC channels. Designers should verify the exact reference architecture in the respective Analog Devices datasheets.
What are the operating temperature ranges for the AD5318ARU and AD5317ARU?
Both devices are specified for the industrial temperature range of −40°C to +105°C, as indicated by the "ARU" suffix in the part number. This makes them suitable for industrial and automotive-adjacent applications within that range.