Part A
AD7226KRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6418 PCS
- Package
- SOIC-20
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD7226KRZ and AD7225KRZ are both quad 8-bit voltage-output DACs from Analog Devices in a 24-lead SOIC package, sharing the same resolution, channel count, and supply architecture. The AD7225KRZ adds a separate reference input per DAC, which requires careful reference routing but does not prevent functional substitution in most designs. The AD7226KRZ is a viable functional replacement candidate for the AD7225KRZ where a single shared reference is acceptable, subject to validation of the reference configuration and output loading in the target application.
Resolution and Channel Count
High match
Package and Pin Configuration
High match
Reference Input Architecture
Validation required
Output Voltage Range
High match
Parts at a glance
Part B
AD7225KRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3446 PCS
- Package
- SOIC-24
- 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 | AD7226KRZ | AD7225KRZ | Why it matters |
|---|---|---|---|
| Number of DACs | 4 | 4 | Both are quad DACs, so channel count is identical and not a differentiator. |
| DAC Architecture / Output Type | Voltage output, 8-bit | Voltage output, 8-bit | Both provide 8-bit voltage-output DACs, making them functionally similar in resolution and output form. |
| Interface | Parallel (double-buffered) | Parallel (double-buffered) | Interface compatibility determines whether the part can drop into an existing digital bus design. |
| Supply Voltage | +12 V to +15 V (single/dual) | +12 V to +15 V (single/dual) | Supply range must match the system rail to ensure correct operation and output swing. |
| Reference Input | External reference | External reference | Both require an external reference, so reference design can be shared between the two parts. |
| Package | 28-lead SOIC (R-28) | 28-lead SOIC (R-28) | Identical package and pinout allow direct board-level substitution 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 requirements. |
| Settling Time | ~5 µs (to ±1/2 LSB) | ~5 µs (to ±1/2 LSB) | Settling time affects achievable update rate and dynamic accuracy in control loops. |
| Output Voltage Range | 0 V to VREF (unipolar) | 0 V to VREF (unipolar) | Output span must match the downstream analog signal chain for correct scaling. |
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 | AD7226KRZ | AD7225KRZ |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Analog Devices Inc. |
| Part Status | Active | Active |
| Number of Bits | 8 | 8 |
| Number of D/A Converters | 4 | 4 |
| Settling Time | 4µs | 4µs |
| Output Type | Voltage - Buffered | Voltage - Buffered |
| Differential Output | No | No |
| Data Interface | Parallel | Parallel |
| Reference Type | External | External |
| Voltage - Supply, Analog | 11.4V ~ 16.5V, -5V | 11.4V ~ 16.5V, -5V |
| Voltage - Supply, Digital | 14.25V ~ 15.75V | 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 AD7226KRZ and AD7225KRZ?
The AD7226KRZ is a quad 8-bit voltage-output DAC, while the AD7225KRZ is a quad 8-bit voltage-output DAC with a different digital interface and reference architecture. The AD7226KRZ provides four independent DACs with a single external reference input and a 5V supply, whereas the AD7225KRZ features a 5V supply, four DACs, and a parallel interface with separate reference inputs per DAC pair. Both are offered in a 20-lead SOIC (R-20) package in the KRZ grade.
Are the AD7226KRZ and AD7225KRZ pin-compatible?
No. Although both devices are housed in a 20-lead SOIC (R-20) package, their pinouts differ. The AD7226KRZ and AD7225KRZ assign different functions to several pins, including reference inputs, analog outputs, and digital control lines. A direct drop-in replacement is not possible without PCB layout changes and verification against the respective datasheets.
What is the resolution and number of DAC channels for each device?
Both the AD7226KRZ and AD7225KRZ are quad (four-channel) 8-bit voltage-output digital-to-analog converters. Each device integrates four independent DACs on a single monolithic CMOS chip.
What supply voltage do the AD7226KRZ and AD7225KRZ require?
Both the AD7226KRZ and AD7225KRZ operate from a single +5V supply. The AD7225KRZ additionally provides a +5V reference output and accepts external reference inputs, while the AD7226KRZ uses a single external reference input for all four DACs.
How do the digital interfaces of the AD7226KRZ and AD7225KRZ differ?
The AD7226KRZ uses a parallel 8-bit microprocessor-compatible interface with address decoding for selecting one of the four DACs. The AD7225KRZ also uses a parallel interface but includes a different control logic scheme with separate reference inputs and a different data loading structure. Designers must consult the respective datasheets for timing and control signal differences.
What is the package and operating temperature range for the KRZ grade?
Both the AD7226KRZ and AD7225KRZ are supplied in a 20-lead SOIC package (R-20 suffix) and are specified for the commercial temperature range of 0°C to +70°C, as denoted by the K grade in the part number.
Can the AD7226KRZ be used as a direct substitute for the AD7225KRZ in an existing design?
No. Due to differences in pinout, reference architecture, and digital control logic, the AD7226KRZ is not a direct substitute for the AD7225KRZ. Any substitution requires a full review of the schematic, PCB layout, and firmware timing against both datasheets, followed by validation in the target application.