Part A
AD7228ACR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3193 Stückzahl
- Package
- SOIC-24
- Series
- Data Acquisition von Digital to Analog Converters (DAC)
Replacement verdict
Not a drop-in replacement
The AD7228ACR and AD7225KRZ 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 and validation.
Different output amplifier type
Different reference input configuration
Different package footprint
Different interface timing
Parts at a glance
Part B
AD7225KRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3446 Stückzahl
- Package
- SOIC-24
- Series
- Data Acquisition von Digital to Analog Converters (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 | AD7228ACR | AD7225KRZ | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 8 | 4 | Determines how many independent analog outputs are available; 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, so resolution and quantization error are equivalent, which is critical for matching output accuracy in a substitution. |
| Output Voltage Range | 0 V to VREF (unipolar), VREF to GND (bipolar option) | 0 V to VREF (unipolar), VREF to GND (bipolar option) | The output span must match the system's analog input requirements; both support unipolar and bipolar operation, aiding substitutability. |
| Reference Input | External VREF | External VREF | Both require an external reference, so the same reference source can be reused, simplifying replacement. |
| 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 supply rails ensures the replacement will operate in the same power environment without redesign. |
| Digital Interface | Parallel, microprocessor-compatible | Parallel, microprocessor-compatible | A compatible parallel interface allows the same microcontroller bus and timing to drive either device. |
| Package | 28-lead SOIC (R) | 28-lead SOIC (R) | Identical package and pin count enable drop-in PCB replacement without layout changes. |
| Operating Temperature Range | 0 °C to +70 °C (commercial) | 0 °C to +70 °C (commercial) | Matching temperature grades ensure the part meets the same environmental specifications in the target application. |
| Integral Nonlinearity (INL) | ±1 LSB (max) | ±1 LSB (max) | INL defines DC accuracy; equivalent INL means the replacement will deliver comparable linearity performance. |
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 | AD7228ACR | AD7225KRZ |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Analog Devices Inc. |
| Part Status | Obsolete | 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 primary differences between the AD7228ACR and AD7225KRZ?
The AD7228ACR 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 AD7228 provides eight DAC channels, while the AD7225 provides four.
Are the AD7228ACR and AD7225KRZ pin-compatible?
No. Although both devices are offered in 24-lead SOIC packages, they are not pin-compatible. The AD7228 is an octal DAC with a different pin function assignment than the quad AD7225. The data bus, address decoding, and analog output pins are arranged differently, so a direct drop-in replacement is not possible without PCB redesign.
What is the resolution and number of DAC channels for each device?
Both devices offer 8-bit resolution. The AD7228ACR integrates eight independent 8-bit voltage-output DACs with eight output amplifiers. The AD7225KRZ integrates four independent 8-bit voltage-output DACs with four output amplifiers.
What is the digital interface architecture of the AD7228ACR versus the AD7225KRZ?
The AD7228ACR uses a double-buffered 8-bit parallel interface with address decoding for eight DACs, allowing individual channel updates. The AD7225KRZ uses a double-buffered 8-bit parallel interface with 2-bit address decoding for four DACs. Both devices support simultaneous update of all DACs via a common LDAC control pin.
What are the output voltage ranges available on these DACs?
Both the AD7228ACR and AD7225KRZ provide voltage output through on-chip amplifiers. The output voltage range is determined by the applied reference voltage and the configured gain. The AD7228 offers a gain of 1 or 2 via a control pin, while the AD7225 provides a fixed gain of 1. The output swing is set by the external reference and the device supply rails.
What are the supply voltage requirements for the AD7228ACR and AD7225KRZ?
Both devices operate from dual power supplies. The AD7228ACR requires a positive supply (VDD) and a negative supply (VSS) in addition to a logic supply (VCC). The AD7225KRZ similarly requires VDD, VSS, and VCC. The specified operating ranges are defined in the respective manufacturer datasheets, and the supplies must be within those limits for proper operation.
Can the AD7225KRZ be used as a replacement for the AD7228ACR in an existing design?
No. The AD7225KRZ provides only four DAC channels versus eight on the AD7228ACR, and the pinouts differ. A replacement would require a new PCB layout, revised address decoding, and verification that four channels are sufficient for the application. The two devices are not interchangeable without design changes.
What are the package and temperature range specifications for these devices?
Both the AD7228ACR and AD7225KRZ are supplied in 24-lead SOIC packages. The "A" and "K" grade suffixes indicate commercial temperature range specifications, typically 0°C to +70°C, as defined in the respective Analog Devices datasheets. Both are specified for commercial-grade operation.