Part A
AD7243ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3805 PCS
- Package
- SOIC-16
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD7243ARZ and AD7245AAR are both 12-bit voltage-output DACs from Analog Devices in a 24-lead SOIC package, sharing a comparable digital interface and reference architecture. While the AD7243ARZ offers a wider supply range and faster settling, the AD7245AAR provides a tighter gain error specification. Designers should validate supply headroom, settling-time margin, and output-range configuration against the target application before substituting one for the other.
Resolution and DAC Architecture
High match
Package and Pin Configuration
High match
Supply Voltage Range
Validation required
Settling Time and Output Range
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7243ARZ | AD7245AAR | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit DACs, so quantization step size and achievable output precision are equivalent. |
| Number of DAC Channels | 1 | 1 | Single-channel architecture in both parts means board layout and channel count requirements are interchangeable. |
| Output Voltage Range | ±10 V (bipolar) / 0 to +10 V (unipolar), selectable | 0 to +10 V (unipolar) / ±10 V (bipolar), selectable | Both support selectable unipolar and bipolar output spans, allowing direct substitution in systems needing either output configuration. |
| Reference Type | Internal reference (5 V) | Internal reference (5 V) | An on-chip reference eliminates the need for an external reference, simplifying design and improving gain stability in both parts. |
| Interface Type | Serial (SPI-compatible, 3-wire) | Parallel (12-bit microprocessor bus) | This is a critical difference: serial vs parallel interface determines microcontroller pin count, bus architecture, and firmware, so the parts are not drop-in interchangeable without interface redesign. |
| Supply Voltage | ±15 V (dual) with +5 V logic | ±15 V (dual) with +5 V logic | Identical supply requirements mean the same power rails can be reused when swapping between the two devices. |
| Settling Time | 10 µs (to ±1/2 LSB) | 10 µs (to ±1/2 LSB) | Equivalent settling time means comparable dynamic performance and update rate capability in either part. |
| Package / Mounting | 20-lead SOIC (surface mount) | 24-lead PDIP (through-hole) | Different package types and pin counts affect PCB footprint, assembly process, and mechanical fit, so a board redesign is required to substitute one for the other. |
| Operating Temperature Range | -40 °C to +85 °C (industrial) | -40 °C to +85 °C (industrial) | Matching industrial temperature ratings ensure both parts suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7243ARZ | AD7245AAR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Series | DACPORT® | DACPORT® |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Number of D/A Converters | 1 | 1 |
| Settling Time | 10µs | 7µs |
| Output Type | Voltage - Buffered | Voltage - Buffered |
| Differential Output | No | No |
| Data Interface | SPI | Parallel |
| Reference Type | External, Internal | Internal |
| Voltage - Supply, Analog | ±10.8V ~ 16.5V | ±10.8V ~ 16.5V |
| Voltage - Supply, Digital | - | 10.8V ~ 16.5V |
| INL / DNL(LSB) | ±1 (Max), ±0.9 (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 AD7243ARZ and the AD7245AAR?
The AD7243ARZ is a 12-bit voltage-output DAC with an on-chip reference and output amplifier, specified for operation from a single +5 V supply (with a 3 V option in some grades). The AD7245AAR is a 12-bit voltage-output DAC that requires external reference and operates from ±5 V to ±15 V dual supplies. The AD7243ARZ integrates a reference and output amplifier, while the AD7245AAR requires external reference and op-amp components for full-scale output.
Are the AD7243ARZ and AD7245AAR pin-compatible?
No. The AD7243ARZ is supplied in a 16-lead SOIC (R-16) package, while the AD7245AAR is supplied in a 24-lead SOIC (R-24) package. The pin counts and pin functions differ, so they are not drop-in replacements and require different PCB footprints.
What supply voltage does each device require?
The AD7243ARZ operates from a single +5 V supply (with a +3 V option available in some grades). The AD7245AAR operates from dual supplies of ±5 V to ±15 V. Designs migrating between the two must account for this supply architecture difference.
Do both parts include an on-chip voltage reference?
No. The AD7243ARZ includes an on-chip reference, whereas the AD7245AAR requires an external reference voltage. This affects external component count and total board space in the application.
What is the resolution and output type of each converter?
Both are 12-bit voltage-output digital-to-analog converters. The AD7243ARZ provides a buffered voltage output using its internal output amplifier, while the AD7245AAR provides a voltage output that typically requires an external op-amp for buffering depending on the configuration.
What digital interface do these DACs use?
Both the AD7243ARZ and AD7245AAR use a parallel digital interface for loading DAC data. The interface width and control signals should be verified against the respective manufacturer datasheets before layout or firmware design.
Can the AD7243ARZ directly replace the AD7245AAR in an existing design?
No. Differences in package pinout, supply voltage requirements, and reference architecture (internal versus external) mean the AD7243ARZ cannot be used as a direct drop-in replacement for the AD7245AAR without schematic and layout changes validated against the manufacturer datasheets.