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
AD7228ACRZ and AD7224KR-1 are not functionally interchangeable: the AD7228ACRZ is an octal 8-bit voltage-output DAC, while the AD7224KR-1 is a single-channel 8-bit voltage-output DAC. The channel count, package footprint, and reference architecture differ, so the AD7224KR-1 cannot directly replace the AD7228ACRZ in existing designs without significant redesign.
Different channel count
Different package footprint
Different reference architecture
Different interface configuration
Parts at a glance
Part B
AD7224KR-1
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9604 ПКС
- Package
- SOIC-20
- Series
- Сбор данных - цифровые в аналоговые преобразователи (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 | AD7224KR-1 | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 8 | 1 | Determines how many independent analog outputs the device can drive; an 8-channel part cannot be directly substituted where a single-channel part is required and vice versa. |
| Resolution | 8 bits | 8 bits | Both provide 8-bit resolution, so quantization step size and achievable output granularity are equivalent for a given reference. |
| Output Voltage Range | 0 V to VREF (unipolar) or ±VREF (bipolar) | 0 V to VREF (unipolar) or ±VREF (bipolar) | Defines the analog output span; matching ranges ensures the same signal swing can be produced without additional level shifting. |
| Reference Input | External reference required | External reference required | Both need an external voltage reference, so system accuracy and drift depend on the same external reference design. |
| Digital Interface | Parallel (8-bit) with address decoding | Parallel (8-bit) | Interface type affects microcontroller/FPGA pin count and bus timing; the multi-channel part requires address lines to select channels. |
| 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) | Power supply requirements must match the available rails; identical bipolar supplies allow drop-in power compatibility. |
| Package | 28-lead SOIC (R-28) | 20-lead SOIC (R-20) | Footprint and pin count differ, so PCB layout changes are required; the parts are not physically interchangeable. |
| Operating Temperature Range | -40 °C to +85 °C | 0 °C to +70 °C | Affects suitability for industrial versus commercial environments; the wider-range part can replace the narrower one in harsh conditions. |
| Integral Nonlinearity (INL) | ±1 LSB (max) | ±1 LSB (max) | INL sets the worst-case deviation from an ideal transfer function; equal INL means comparable DC accuracy. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7228ACRZ | AD7224KR-1 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 8 | 8 |
| Number of D/A Converters | 8 | 1 |
| Settling Time | 5µs, 7µs | 20µs |
| 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 architectural differences between the AD7228ACRZ and the AD7224KR-1?
The AD7228ACRZ is an octal 8-bit voltage-output digital-to-analog converter (DAC) with eight independent DACs in a single package, while the AD7224KR-1 is a single 8-bit voltage-output DAC. The AD7228ACRZ integrates eight DACs with output amplifiers, whereas the AD7224KR-1 provides one DAC channel with a buffered voltage output.
Do the AD7228ACRZ and AD7224KR-1 use the same digital interface?
Both devices use a parallel digital interface for loading DAC data, but the AD7228ACRZ requires address lines to select one of eight internal DAC latches, while the AD7224KR-1 uses a single set of data inputs with control signals (CS and WR) to load its single DAC register. The interface timing and control pin functions differ accordingly.
Are the AD7228ACRZ and AD7224KR-1 pin-compatible?
No. The AD7228ACRZ is supplied in a 24-lead package to accommodate eight DAC channels, address lines, and multiple control signals, while the AD7224KR-1 is supplied in a smaller package with fewer pins for its single-channel function. The pin counts, pin functions, and PCB land patterns are not interchangeable.
What are the package and temperature grade differences between the AD7228ACRZ and AD7224KR-1?
The AD7228ACRZ is offered in a 24-lead SOIC (R) package in the commercial temperature grade (0°C to +70°C), denoted by the "A" and "C" suffixes. The AD7224KR-1 is offered in a 16-lead SOIC (R) package in the commercial temperature grade (0°C to +70°C), denoted by the "K" grade. Package size and lead count differ between the two devices.
Can the AD7224KR-1 be used as a direct replacement for one channel of the AD7228ACRZ?
No direct drop-in replacement is possible because the two devices differ in package footprint, pinout, and digital interface. A redesign of the PCB and control logic would be required to substitute a single AD7224KR-1 for one channel of an AD7228ACRZ, and the remaining seven channels would need separate devices or a different solution.
Do both the AD7228ACRZ and AD7224KR-1 provide voltage output with on-chip output amplifiers?
Yes. Both the AD7228ACRZ and the AD7224KR-1 are voltage-output DACs that include on-chip output buffer amplifiers, allowing a voltage output directly from the DAC without an external op-amp in most applications. This is a shared architectural feature of both devices.
How does the channel count affect the typical application of each device?
The AD7228ACRZ, with eight DACs, is suited to multi-channel control and trimming applications where several analog outputs must be updated independently from a single package. The AD7224KR-1, with one DAC, is suited to single-channel setpoint, gain, or offset control where only one analog output is required, offering a smaller footprint and simpler interface.