Part A
AD7228ACRZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2789 ПКС
- Package
- SOIC-24
- Series
- Сбор данных - цифровые в аналоговые преобразователи (DAC)
Replacement verdict
Not a drop-in replacement
The AD7228ACRZ and AD7225KR are not drop-in replacements for one another. Although both are octal 8-bit voltage-output DACs from Analog Devices, they differ in output amplifier architecture, reference input configuration, and package footprint, so a direct board-level substitution is not possible without design changes.
Different output amplifier type
Different reference input configuration
Different package footprint
Different interface timing
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7228ACRZ | AD7225KR | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 8 | 4 | Determines how many independent analog outputs the system can drive; an 8-channel part cannot be directly substituted where 4 channels suffice, and vice versa affects board layout and channel count. |
| DAC Architecture / Resolution | 8-bit voltage-output DAC | 8-bit voltage-output DAC | Both are 8-bit voltage-output DACs, so resolution and basic conversion topology match, supporting functional substitutability at the signal-chain level. |
| Output Voltage Range | 0 V to VREF (unipolar), VREF to 0 V (bipolar via offset) | 0 V to VREF (unipolar), VREF to 0 V (bipolar via offset) | Output span must match the downstream load requirements; identical ranges mean the analog interface can be reused without re-scaling. |
| Reference Input | External VREF | External VREF | Both require an external reference, so the reference design and accuracy budget can be carried over between the two parts. |
| Supply Voltage | +12 V to +15 V (VDD), -12 V to -15 V (VSS) | +12 V to +15 V (VDD), -12 V to -15 V (VSS) | Matching dual-supply requirements allow the same power rails and decoupling to be used, simplifying a drop-in replacement. |
| Digital Interface | Parallel, microprocessor-compatible | Parallel, microprocessor-compatible | A compatible parallel bus interface means the same microcontroller/FPGA glue logic and timing can drive either device. |
| Package | 28-lead SOIC (R-28) | 28-lead SOIC (R-28) | Identical package and pin count allow the same PCB footprint, though pinout differences must still be verified before substitution. |
| Operating Temperature Range | -40 °C to +85 °C (industrial) | 0 °C to +70 °C (commercial) | The wider industrial range of the AD7228ACRZ supports harsher environments; substituting the commercial-grade AD7225KR may violate thermal requirements in industrial applications. |
| Settling Time | ~5 µs (to ±1/2 LSB) | ~5 µs (to ±1/2 LSB) | Similar settling times mean comparable dynamic performance for control-loop and waveform-generation use cases. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7228ACRZ | AD7225KR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 8 | 8 |
| Number of D/A Converters | 8 | 4 |
| Settling Time | 5µs, 7µs | 4µs |
| Output Type | Voltage - Buffered | Voltage - Buffered |
| Differential Output | No | No |
| Data Interface | Parallel | Parallel |
| Reference Type | External | External |
| Voltage - Supply, Analog | 10.8V ~ 16.5V, ±5V | 11.4V ~ 16.5V, -5V |
| Voltage - Supply, Digital | 13.5V ~ 16.5V | 14.25V ~ 15.75V |
| INL / DNL(LSB) | ±0.5 (Max), ±1 (Max) | ±1 (Max), ±1 (Max) |
| Architecture | R-2R | R-2R |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the AD7228ACRZ and the AD7225KR?
The AD7228ACRZ is an octal 8-bit voltage-output DAC with eight on-chip output amplifiers, specified for operation over the commercial temperature range and housed in a 24-lead SOIC package. The AD7225KR is a quad 8-bit voltage-output DAC with four output amplifiers, specified over the commercial temperature range and offered in a 24-lead SOIC package. The key differences are channel count (eight versus four) and the corresponding output amplifier count.
Are the AD7228ACRZ and AD7225KR pin-compatible?
No. Although both devices are offered in 24-lead SOIC packages, their pinouts differ because the AD7228ACRZ provides eight DAC channels and the AD7225KR provides four. The pin functions and control signal assignments are not interchangeable, so the PCB layout must be designed specifically for each part.
What is the resolution and architecture of each device?
Both the AD7228ACRZ and the AD7225KR are 8-bit voltage-output digital-to-analog converters with on-chip output amplifiers. The AD7228ACRZ integrates eight DACs and eight amplifiers, while the AD7225KR integrates four DACs and four amplifiers. Both are designed for single-supply or dual-supply operation depending on the configuration specified in the respective datasheets.
Can the AD7225KR be used as a drop-in replacement for the AD7228ACRZ?
No. The AD7225KR has only four DAC channels versus eight on the AD7228ACRZ, and the pinouts are different. A direct drop-in replacement is not possible; any substitution requires a redesign of the PCB layout and verification of channel count, reference configuration, and control logic against the target application.
What package type do the AD7228ACRZ and AD7225KR use?
Both devices are supplied in a 24-lead SOIC (small outline integrated circuit) package. The "R" suffix in both part numbers denotes the SOIC package option. Designers should confirm the exact package drawing and thermal characteristics from the respective manufacturer datasheets before finalizing the layout.
How do the reference input requirements compare between the two parts?
Both the AD7228ACRZ and the AD7225KR require an external voltage reference to set the output voltage range. The reference input architecture and the number of reference pins differ because the AD7228ACRZ supports eight channels while the AD7225KR supports four. The exact reference voltage range and input impedance should be taken from the official datasheets for each device.
Which device is better suited for applications requiring more analog output channels?
The AD7228ACRZ is better suited for applications needing more analog output channels, as it provides eight 8-bit voltage-output DACs in a single package. The AD7225KR provides four channels and is appropriate when fewer outputs are required, allowing a smaller control interface and reduced board space for the DAC function.