Part A
AD7228ACRZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 2789 PCS
- Package
- SOIC-24
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Replacement verdict
Not a drop-in replacement
The AD7228ACRZ and AD7225KRZ are not drop-in replacements for one another. Although both are octal 8-bit voltage-output DACs from Analog Devices in a 24-lead SOIC package, they differ in reference architecture, output amplifier configuration, and interface timing, so a direct board-level substitution is not possible without design review and validation.
Different reference architecture
Different output amplifier configuration
Different interface timing
Validation required
Parts at a glance
Part B
AD7225KRZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3446 PCS
- Package
- SOIC-24
- Series
- Acquisition de données - convertisseur numérique - analogique (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 | AD7228ACRZ | AD7225KRZ | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 8 | 4 | Channel count determines how many independent analog outputs the system can drive; an 8-channel part cannot be directly substituted where only 4 channels are needed without wasting resources, and vice versa. |
| Resolution | 8 bits | 8 bits | Resolution defines the number of discrete output levels; both are 8-bit, so quantization step size is comparable for a given reference. |
| Output Voltage Range | 0 V to VREF (unipolar) or ±VREF (bipolar) | 0 V to VREF (unipolar) or ±VREF (bipolar) | Output span must match the downstream analog signal chain; both support unipolar and bipolar operation via reference configuration. |
| Reference Input | External reference required | External reference required | Both require an external voltage reference, so the reference source and its accuracy directly set the DAC output accuracy. |
| Digital Interface | Parallel, microprocessor-compatible | Parallel, microprocessor-compatible | Interface type must match the host bus; both use a parallel MPU-compatible interface, easing firmware reuse. |
| 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) | Supply rails must be available in the target system; both require dual supplies for bipolar output capability. |
| Package | 28-lead SOIC (R-28) | 24-lead SOIC (R-24) | Package footprint and pin count differ, so PCB layout and land pattern must be redesigned; they are not drop-in compatible. |
| Operating Temperature Range | -40 °C to +85 °C | 0 °C to +70 °C | The wider industrial temperature range of the AD7228ACRZ suits harsher environments, while the AD7225KRZ is limited to commercial temperatures. |
| Integral Nonlinearity (INL) | ±1 LSB (max) | ±1 LSB (max) | INL specifies deviation from an ideal transfer function; matching INL ensures comparable accuracy in precision applications. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7228ACRZ | AD7225KRZ |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Analog Devices Inc. |
| Part Status | Active | Active |
| 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 key differences between the AD7228ACRZ and AD7225KRZ?
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 supplied in a 24-lead SOIC package. The AD7225KRZ is a quad 8-bit voltage-output DAC with four on-chip output amplifiers, specified over the commercial temperature range and supplied in a 24-lead SOIC package. The primary differences are channel count (eight versus four) and the corresponding internal architecture, while both share 8-bit resolution, voltage output, and single/dual supply operation per the Analog Devices datasheets.
Are the AD7228ACRZ and AD7225KRZ pin-compatible?
No. Although both devices are offered in a 24-lead SOIC (R-24) package, their pinouts differ because the AD7228ACRZ provides eight DAC channels and the AD7225KRZ provides four. The pin functions and assignments are defined separately in the respective Analog Devices datasheets, so the two parts are not drop-in replacements and the PCB layout must be designed for the specific device.
Do both parts have the same resolution and output configuration?
Yes. Both the AD7228ACRZ and AD7225KRZ are 8-bit digital-to-analog converters with on-chip output amplifiers that provide voltage outputs. Each device operates from a single or dual power supply as specified in the Analog Devices datasheets, and both use a parallel digital interface for loading DAC data.
What is the difference in channel count and how does it affect system design?
The AD7228ACRZ integrates eight 8-bit DACs, while the AD7225KRZ integrates four 8-bit DACs. For systems requiring more than four voltage-output DAC channels, the AD7228ACRZ reduces component count and board space by replacing two AD7225KRZ devices. For designs needing only four channels, the AD7225KRZ avoids the cost and layout overhead of unused channels.
Are the AD7228ACRZ and AD7225KRZ specified over the same temperature range?
Both the AD7228ACRZ and AD7225KRZ are commercial-grade devices, with the "A" and "K" grade designations respectively indicating specifications over the commercial temperature range as defined in the Analog Devices datasheets. Designers requiring extended or industrial temperature operation should consult the corresponding grade variants rather than these commercial parts.
Can the AD7225KRZ be used as a substitute for the AD7228ACRZ in an existing design?
No, not as a direct substitute. The AD7225KRZ provides only four DAC channels versus eight on the AD7228ACRZ, and the pinouts of the two 24-lead SOIC devices differ. Substitution would require a redesign of the analog output section and PCB layout, and the reduced channel count would not satisfy applications that rely on all eight outputs of the AD7228ACRZ.
What package do the AD7228ACRZ and AD7225KRZ use?
Both devices are supplied in a 24-lead SOIC package, denoted by the "R" suffix in the Analog Devices ordering code (R-24 package). The "Z" suffix indicates RoHS-compliant lead finish per Analog Devices ordering information. Designers should confirm the exact package outline and thermal characteristics in the respective datasheets before finalizing the PCB footprint.