Part A
AD7226KRZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6418 PCS
- Package
- SOIC-20
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Not a drop-in replacement
The AD7226KRZ and AD7224KR-1 are not drop-in replacements for one another. The AD7226KRZ integrates four independent 8-bit voltage-output DACs in a single package, while the AD7224KR-1 provides a single 8-bit voltage-output DAC. This fundamental difference in channel count, combined with differing package pinouts and reference architecture, means the two devices are not functionally or mechanically interchangeable in a common socket. Designers must treat them as distinct components requiring separate circuit design and layout considerations.
Different channel count
Different package pinout
Different reference architecture
Different board footprint
Parts at a glance
Part B
AD7224KR-1
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9604 PCS
- Package
- SOIC-20
- Series
- Data Acquisition - Digital to Analog Converters (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 | AD7224KR-1 | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 4 | 1 | Determines how many independent analog outputs the device can drive; a 4-channel part cannot be substituted where a single-channel part is expected without redesigning the output stage. |
| Resolution | 8 bits | 8 bits | Both provide 8-bit resolution, so quantization step size and achievable output precision are equivalent for a given reference voltage. |
| Output Type | Voltage output | Voltage output | Voltage-output DACs can drive loads directly without an external I/V converter, simplifying the analog signal chain. |
| Reference Input | External reference | External reference | Both require an external voltage reference, so the system must supply a stable reference for accurate full-scale output. |
| Supply Voltage | +12 V to +15 V (single) or ±12 V to ±15 V (dual) | +12 V to +15 V (single) or ±12 V to ±15 V (dual) | Operating from the same supply rails allows both parts to share a common power design, though the channel count differs. |
| Digital Interface | Parallel, 8-bit | Parallel, 8-bit | A parallel interface provides fast, direct microcontroller or bus access; matching bus width eases firmware and timing reuse. |
| Package | 28-lead SOIC (wide) | 20-lead SOIC (wide) | Different package footprints and pin counts prevent direct board-level drop-in replacement without layout changes. |
| Operating Temperature Range | 0°C to +70°C (commercial) | 0°C to +70°C (commercial) | Both are rated for commercial temperature ranges, so environmental suitability is equivalent for indoor applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7226KRZ | AD7224KR-1 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 8 | 8 |
| Number of D/A Converters | 4 | 1 |
| Settling Time | 4µs | 20µs |
| 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 architectural differences between the AD7226KRZ and AD7224KR-1?
The AD7226KRZ is a quad 8-bit voltage-output digital-to-analog converter (DAC) with four independent on-chip output amplifiers, while the AD7224KR-1 is a single 8-bit voltage-output DAC with one on-chip output amplifier. Both are fabricated in a CMOS process and include a microprocessor-compatible interface, but the AD7226KRZ integrates four DAC channels in a single package, whereas the AD7224KR-1 provides one channel.
Are the AD7226KRZ and AD7224KR-1 pin-compatible or package-compatible?
No. The AD7226KRZ is supplied in a 20-lead SOIC (R-20) package, while the AD7224KR-1 is supplied in a 20-lead SOIC (R-20) package as well, but the pin functions differ because the AD7226KRZ routes four DAC outputs and associated control signals, whereas the AD7224KR-1 routes a single DAC output. The two devices are not direct drop-in replacements and require separate PCB layouts.
What is the resolution and output configuration of each device?
Both devices are 8-bit voltage-output DACs. The AD7226KRZ provides four independent 8-bit DACs, each with its own output amplifier capable of driving a load. The AD7224KR-1 provides a single 8-bit DAC with one output amplifier. Both operate from a single +5 V to +15 V supply (dual supplies also supported) and produce a voltage output proportional to the digital input code.
Can the AD7226KRZ and AD7224KR-1 operate from the same power supply voltages?
Yes. Both devices are specified for operation from a single supply of +5 V to +15 V, and both support dual-supply operation (e.g., ±5 V). The AD7226KRZ and AD7224KR-1 share the same supply voltage range per the Analog Devices datasheets, so power-supply design constraints are similar for both parts.
What is the digital interface compatibility of these DACs?
Both the AD7226KRZ and AD7224KR-1 feature a microprocessor-compatible parallel digital interface with standard TTL/CMOS-compatible logic inputs. The AD7226KRZ uses a 2-bit address input (A0, A1) to select one of four DAC channels plus write control, while the AD7224KR-1 uses chip-select and write control for its single channel. Both interface directly to most 8-bit microprocessors and microcontrollers without additional glue logic.
Which device should be selected for a multi-channel application?
The AD7226KRZ is the appropriate choice for multi-channel applications because it integrates four independent 8-bit DACs with output amplifiers in a single 20-lead SOIC package, reducing board space and component count compared to using four discrete AD7224KR-1 devices. The AD7224KR-1 is better suited to single-channel designs where only one DAC output is required.
Do both devices offer the same output voltage range and reference requirements?
Both devices use an external reference input to set the output voltage span and provide a voltage output that is a function of the applied reference and digital code. The AD7226KRZ has a single reference input shared by all four DACs, while the AD7224KR-1 has its own reference input. In both cases, the output range is determined by the external reference voltage, and neither device includes an internal reference.
Are the AD7226KRZ and AD7224KR-1 specified over the same operating temperature range?
Both devices are specified for the commercial temperature range of 0°C to +70°C, consistent with the "K" grade designation in their part numbers. The AD7226KRZ and AD7224KR-1 share this commercial temperature specification per Analog Devices datasheets, so neither is rated for industrial or extended temperature operation under these specific grade suffixes.