Part A
AD7228ACR
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3193 PCS
- Package
- SOIC-24
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Not a drop-in replacement
The AD7228ACR and AD7225KR are both octal 8-bit voltage-output DACs, but they differ in output configuration, reference architecture, and package footprint, so the AD7225KR cannot be used as a direct drop-in substitute for the AD7228ACR without design changes and validation.
Different output configuration
Different reference architecture
Different package footprint
Different interface timing
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 | AD7225KR | Why it matters |
|---|---|---|---|
| Number of DACs | 8 | 4 | Determines how many independent analog output channels are available; a direct functional substitutability constraint. |
| Resolution | 8 bits | 8 bits | Sets the output granularity (256 steps); identical resolution means comparable output precision per channel. |
| Output Voltage Range | 0 to VREF (unipolar) or ±VREF (bipolar) | 0 to VREF (unipolar) or ±VREF (bipolar) | Defines the analog output span; matching ranges allow use in the same signal chain without level shifting. |
| Reference Input | External reference required | External reference required | Both need an external reference, so system accuracy depends on the same external reference design. |
| Digital Interface | Parallel, microprocessor-compatible | Parallel, microprocessor-compatible | Determines how the DAC connects to the host controller; matching parallel interfaces simplify board-level substitution. |
| 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 rail requirements must match the existing supply design for drop-in compatibility. |
| Package | 28-lead SOIC (R) | 28-lead SOIC (R) | Footprint and pin count must match for physical board compatibility. |
| Operating Temperature Range | 0°C to +70°C (commercial) | 0°C to +70°C (commercial) | Ensures the part meets the environmental conditions of the target application. |
| Settling Time | ~5 µs (to ±1/2 LSB) | ~5 µs (to ±1/2 LSB) | Affects maximum update rate and dynamic performance in the application. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7228ACR | AD7225KR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| 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 AD7225KR?
The AD7228ACR is an octal 8-bit voltage-output DAC with eight on-chip output amplifiers, while the AD7225KR is a quad 8-bit voltage-output DAC with four output amplifiers. The AD7228ACR is supplied in a 24-lead SOIC package, whereas the AD7225KR is supplied in a 24-lead SOIC (0.3 inch body) package. Both are manufactured by Analog Devices and operate from a single +5 V to +15 V supply with a 5 V reference input range.
Are the AD7228ACR and AD7225KR pin-compatible?
No. Although both devices are offered in 24-lead SOIC packages, their pinouts differ because the AD7228ACR provides eight DAC channels and the AD7225KR provides four. The pin functions, including data bus connections and address decoding, are not interchangeable, so the PCB layout must be designed specifically for each part.
What is the resolution and channel count of each device?
Both devices are 8-bit resolution DACs. The AD7228ACR integrates eight independent voltage-output DACs, while the AD7225KR integrates four independent voltage-output DACs. Each channel includes an on-chip output amplifier capable of driving a load to the supply rails.
What supply voltage and reference requirements apply to these DACs?
Both the AD7228ACR and AD7225KR operate from a single supply voltage in the range of +5 V to +15 V. Each requires an external reference voltage, and the reference input range is typically 5 V. The output voltage span is determined by the applied reference voltage, and the devices are specified for operation over the commercial temperature range of 0°C to +70°C (K and C grades).
How does the digital interface differ between the AD7228ACR and AD7225KR?
Both devices use a parallel microprocessor-compatible interface with an 8-bit data bus. The AD7228ACR uses a 3-bit address input (A0–A2) to select one of eight DAC channels, while the AD7225KR uses a 2-bit address input (A0–A1) to select one of four channels. Both include WR and LDAC control signals for writing data and updating outputs.
Can the AD7228ACR be used as a drop-in replacement for the AD7225KR?
No. The AD7228ACR and AD7225KR are not drop-in replacements for each other. They differ in channel count (eight versus four), pinout, address decoding, and package pin assignments. A direct substitution would require a redesign of the PCB layout and verification of the system's channel requirements and timing.
What are the package and temperature grade differences between the C and K suffixes?
The "C" suffix on the AD7228ACR and the "K" suffix on the AD7225KR both denote the commercial temperature grade, specified for 0°C to +70°C operation. Both parts are offered in 24-lead SOIC packages. The suffix letter does not indicate a difference in package type between these two specific orderable part numbers; it reflects the manufacturer's grade designation for the commercial temperature range.