Part A
AD7228ACR
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3193 PCS
- Package
- SOIC-24
- Series
- Acquisition de données - convertisseur numérique - analogique (DAC)
Replacement verdict
Not a drop-in replacement
The AD7228ACR and AD7225LR 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 type, so a direct board-level substitution is not possible without design changes.
Different output amplifier type
Different reference input configuration
Different package type
Different interface timing
Parts at a glance
Part B
AD7225LR
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7017 PCS
- Package
- SOIC-24
- Series
- Acquisition de données - convertisseur numérique - analogique (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 | AD7225LR | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 8 | 4 | Channel count determines how many independent analog outputs the system can drive; an 8-channel part cannot be directly substituted where only 4 channels are needed without wasting resources, and vice versa. |
| DAC Architecture / Resolution | 8-bit voltage output DAC | 8-bit voltage output DAC | Both are 8-bit voltage-output DACs, so resolution and output type are compatible for substitutability in terms of quantization and output signal form. |
| Output Voltage Range | 0 V to VREF (unipolar, VSS/VDD rails) | 0 V to VREF (unipolar) | The output span relative to the reference determines the analog signal range; matching ranges ensures the downstream circuitry sees compatible voltage levels. |
| Reference Input | External reference required | External reference required | Both require an external voltage reference, so the reference design and accuracy budget can be reused when substituting one for the other. |
| Digital Interface | Parallel, microprocessor-compatible (8-bit bus) | Parallel, microprocessor-compatible (8-bit bus) | A matching parallel bus interface allows the same microcontroller/FPGA glue logic and timing to be reused, simplifying board redesign. |
| 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) | Identical bipolar supply requirements mean the existing power rail design can support either device without modification. |
| Package | 28-lead SOIC (R) | 24-lead SOIC (R) | Different package footprints and pin counts mean the PCB layout must change; they are not drop-in footprint-compatible. |
| Operating Temperature Range | 0°C to +70°C (commercial) | 0°C to +70°C (commercial) | Matching temperature grades ensure both parts are suitable for the same ambient operating environment. |
| Integral Nonlinearity (INL) | ±1 LSB (max) | ±1 LSB (max) | Equivalent INL means both parts deliver comparable DC accuracy, so system error budgets remain valid across substitution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7228ACR | AD7225LR |
|---|---|---|
| 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) | ±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 AD7228ACR and AD7225LR?
The AD7228ACR is an octal 8-bit voltage-output DAC with eight on-chip output amplifiers, specified for operation over the commercial temperature range (0°C to +70°C) in a 24-lead SOIC package. The AD7225LR is a quad 8-bit voltage-output DAC with four on-chip output amplifiers, specified over the industrial temperature range (-40°C to +85°C) in a 24-lead SOIC package. The primary differences are channel count (8 vs 4), temperature grade (commercial vs industrial), and the corresponding grade/package suffix designations.
Are the AD7228ACR and AD7225LR pin-compatible?
No. Although both devices are offered in 24-lead SOIC packages, they are not pin-compatible. The AD7228 provides eight DAC channels and the AD7225 provides four, so the pin assignments for data inputs, address decoding, and reference/output connections differ between the two devices. A direct drop-in replacement is not possible without PCB redesign.
Can the AD7228ACR be used as a substitute for the AD7225LR in an existing design?
Not as a direct substitute. The AD7228ACR offers eight DAC channels versus four on the AD7225LR, and the two parts have different pinouts and different specified temperature ranges (commercial vs industrial). Substitution would require verifying channel mapping, reference configuration, digital interface timing, and thermal requirements against the manufacturer datasheets, and would typically require a PCB layout change.
What is the resolution and architecture of each device?
Both the AD7228ACR and AD7225LR are 8-bit voltage-output digital-to-analog converters with on-chip output amplifiers. Each device integrates a DAC ladder network and output buffer per channel, allowing direct voltage output without external op-amps. Resolution is 8 bits (256 codes) for both parts.
How do the temperature ranges of the AD7228ACR and AD7225LR compare?
The AD7228ACR is specified for the commercial temperature range of 0°C to +70°C. The AD7225LR is specified for the industrial temperature range of -40°C to +85°C. Designs requiring operation below 0°C or above +70°C should use the industrial-grade AD7225LR rather than the commercial-grade AD7228ACR.
What package options are available for these two DACs?
Both the AD7228ACR and AD7225LR are supplied in 24-lead SOIC (small outline integrated circuit) packages. The "R" suffix in both part numbers denotes the SOIC package option. Designers should confirm the exact package outline and thermal characteristics in the respective manufacturer datasheets before layout.
Do the AD7228ACR and AD7225LR share the same digital interface?
Both devices use a parallel digital interface with address decoding to select individual DAC channels for data loading. However, because the AD7228 has eight channels and the AD7225 has four, the number of address lines and the channel-select decoding differ. The interface timing and control signal definitions should be verified separately in each datasheet.
Which device should be selected for a multi-channel application requiring more than four DAC outputs?
The AD7228ACR should be selected when more than four voltage-output DAC channels are required, since it provides eight channels in a single 24-lead SOIC package. The AD7225LR provides only four channels. For applications needing more than eight channels, multiple AD7228ACR devices can be used, subject to board space and interface considerations.