Part A
AD7226KRZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6418 個数
- Package
- SOIC-20
- Series
- データ取得 - デジタル/アナログコンバータ (DAC)
Replacement verdict
Not a drop-in replacement
The AD7228ACRZ and AD7226KRZ are not drop-in replacements for one another. The AD7228ACRZ integrates eight 8-bit voltage-output DACs in a 24-lead SOIC package, while the AD7226KRZ provides four 8-bit voltage-output DACs in a 20-lead SOIC package. The differing channel count, package footprint, and reference architecture require board redesign and separate validation before either part can substitute for the other in an existing design.
Different channel count
Different package footprint
Different reference architecture
Different interface loading
Parts at a glance
Part B
AD7228ACRZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2789 個数
- Package
- SOIC-24
- Series
- データ取得 - デジタル/アナログコンバータ (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 | AD7226KRZ | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 8 | 4 | Channel count determines how many independent analog outputs the system can drive; a direct functional substitutability constraint. |
| Resolution | 8 bits | 8 bits | Resolution sets the output step size and achievable accuracy; both match at 8 bits, so precision class is equivalent. |
| Output Voltage Range | 0 to VREF (unipolar) or ±VREF (bipolar) | 0 to VREF (unipolar) or ±VREF (bipolar) | Output span must match the downstream analog signal chain; both support unipolar and bipolar operation. |
| Reference Input | External VREF | External VREF | Both require an external reference, so the reference design can be reused without change. |
| 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 compatible with the existing power architecture; both use the same dual supplies. |
| Digital Interface | Parallel, microprocessor-compatible | Parallel, microprocessor-compatible | Interface type affects bus timing and glue logic; both are parallel MPU-compatible parts. |
| Package | 28-lead SOIC (R-28) | 20-lead SOIC (R-20) | Footprint and pin count differ, so a board redesign or adapter is required for substitution. |
| Operating Temperature Range | -40 °C to +85 °C | 0 °C to +70 °C | Temperature grade affects suitability for industrial versus commercial environments. |
| Settling Time | 5 µs (typical, to ±1/2 LSB) | 5 µs (typical, to ±1/2 LSB) | Settling time governs update rate capability; identical values mean dynamic performance is equivalent. |
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 | AD7228ACRZ |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 8 | 8 |
| Number of D/A Converters | 4 | 8 |
| Settling Time | 4µs | 5µs, 7µs |
| 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 | 10.8V ~ 16.5V, ±5V |
| Voltage - Supply, Digital | 14.25V ~ 15.75V | 13.5V ~ 16.5V |
| INL / DNL(LSB) | ±0.5 (Max), +1 (Max) | ±0.5 (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 AD7226KRZ?
The AD7228ACRZ is an octal 8-bit voltage-output DAC with eight on-chip output amplifiers, while the AD7226KRZ is a quad 8-bit voltage-output DAC with four on-chip output amplifiers. The AD7228ACRZ provides eight DAC channels in a 24-lead SOIC package, whereas the AD7226KRZ provides four DAC channels in a 20-lead SOIC package. Both are single-supply CMOS devices with a 5 V to 15 V supply range and parallel microprocessor-compatible inputs.
Are the AD7228ACRZ and AD7226KRZ pin-compatible?
No. The AD7228ACRZ is housed in a 24-lead SOIC (RW-24) package, and the AD7226KRZ is housed in a 20-lead SOIC (RW-20) package. The different package sizes and pin counts mean they are not drop-in replacements for each other and require different PCB footprints.
What is the resolution and channel count of each device?
Both devices are 8-bit resolution DACs. The AD7228ACRZ integrates eight independent DAC channels with eight output amplifiers, while the AD7226KRZ integrates four independent DAC channels with four output amplifiers. Channel count is the primary functional differentiator between the two parts.
What supply voltage range do the AD7228ACRZ and AD7226KRZ support?
Both devices operate from a single supply in the range of 5 V to 15 V, and both require a VDD supply as well as a VSS negative supply for the output amplifiers. Designers should consult the respective manufacturer datasheets for the exact recommended operating conditions and supply tolerances.
Do both parts have a parallel microprocessor-compatible interface?
Yes. Both the AD7228ACRZ and AD7226KRZ feature parallel, microprocessor-compatible digital inputs with standard data, address, and control lines (including CS and WR), allowing direct interfacing to common 8-bit microprocessors and buses.
What are the package and temperature grade differences between the AD7228ACRZ and AD7226KRZ?
The AD7228ACRZ is supplied in a 24-lead SOIC package, and the AD7226KRZ is supplied in a 20-lead SOIC package. The "A" and "K" grade designations in the part numbers correspond to the manufacturer's specified grade and temperature range; designers should verify the exact operating temperature range and accuracy grade from the official datasheet for each orderable part number.
Can the AD7226KRZ be used as a replacement for the AD7228ACRZ in an existing design?
Not directly. The AD7226KRZ provides only four DAC channels versus eight on the AD7228ACRZ, and it uses a different 20-lead package versus the 24-lead package of the AD7228ACRZ. A replacement would require a redesign of the channel count, PCB footprint, and address decoding, and must be validated against the manufacturer datasheets for both parts.