Part A
AD7801BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5137 PCS
- Package
- SOIC-20
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
Replacement verdict
Not a drop-in replacement
The AD7801BRZ and AD7805BR are not drop-in replacements for one another. Although both are 8-bit voltage-output DACs from Analog Devices, they differ in resolution-related architecture, interface protocol, package footprint, and reference configuration, so substituting one for the other requires design validation and layout changes.
Different interface type
Different package footprint
Different reference configuration
Different channel count
Parts at a glance
Part B
AD7805BR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4842 PCS
- Package
- SOIC-28
- Series
- Acquisição de dados - Convertedores digitais para analógicos (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 | AD7801BRZ | AD7805BR | Why it matters |
|---|---|---|---|
| Resolution | 8-bit | 10-bit | Resolution determines the number of discrete output levels; a 10-bit DAC offers four times finer granularity than an 8-bit DAC, affecting precision of the analog output. |
| Number of DAC Channels | 1 | 4 | Channel count defines how many independent analog outputs are available; a single-channel part cannot directly replace a quad-channel part in multi-output systems. |
| Interface Type | Parallel | Parallel | The digital interface must match the host controller; both use a parallel interface, but the bus width and control signals differ, affecting pin compatibility. |
| Supply Voltage (VDD) | 2.7 V to 5.5 V | 3.3 V to 5.5 V | Operating supply range determines compatibility with the system power rail; the AD7801 supports lower voltages down to 2.7 V, while the AD7805 requires at least 3.3 V. |
| Reference Type | External | Internal / External | An internal reference simplifies design and reduces external components, while an external-only reference requires the system to supply a precision voltage reference. |
| Package / Mounting | 20-Lead SOIC (Surface Mount) | 28-Lead SOIC (Surface Mount) | Package footprint and pin count must match the PCB layout; differing lead counts and body sizes prevent direct drop-in substitution. |
| Settling Time | 1 µs (typical) | 1.5 µs (typical) | Settling time affects the maximum update rate and dynamic performance; faster settling enables higher-speed waveform generation or control loops. |
| Output Voltage Range | 0 V to VREF | 0 V to VREF (buffered) | Output range determines the analog span; the AD7805 provides a buffered output, which affects drive capability and load regulation. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7801BRZ | AD7805BR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 8 | 10 |
| Number of D/A Converters | 1 | 4 |
| Settling Time | 2µs | 4µs |
| Output Type | Voltage - Buffered | Voltage - Buffered |
| Differential Output | No | No |
| Data Interface | Parallel | Parallel |
| Reference Type | External | External, Internal |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 3V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 3V ~ 5.5V |
| INL / DNL(LSB) | ±1 (Max), ±1 (Max) | ±3 (Max), ±0.125 |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
| Architecture | Current Source | - |
Frequently asked questions
What are the primary differences between the AD7801BRZ and the AD7805BR?
The AD7801BRZ is an 8-bit voltage-output digital-to-analog converter (DAC) with a parallel interface, housed in a 20-lead SOIC package. The AD7805BR is a 10-bit voltage-output DAC with a parallel interface, housed in a 28-lead SOIC package. The AD7805BR offers higher resolution (10-bit vs. 8-bit) and additional features, while the AD7801BRZ is a simpler, lower-resolution device in a smaller package.
Are the AD7801BRZ and AD7805BR pin-compatible?
No. The AD7801BRZ is supplied in a 20-lead SOIC (RW-20) package, while the AD7805BR is supplied in a 28-lead SOIC (RW-28) package. The different pin counts and pin functions mean they are not pin-compatible and cannot be interchanged on the same PCB footprint without redesign.
What is the resolution and number of DAC channels for each device?
The AD7801BRZ provides 8-bit resolution with a single voltage-output DAC channel. The AD7805BR provides 10-bit resolution with a single voltage-output DAC channel. Both are single-channel DACs, but the AD7805BR delivers four times the resolution of the AD7801BRZ.
What digital interface do the AD7801BRZ and AD7805BR use?
Both devices use a parallel digital interface for loading DAC data. The AD7801BRZ has an 8-bit parallel input, while the AD7805BR has a 10-bit parallel input. The interface timing and control signals should be verified against the respective manufacturer datasheets for specific implementation details.
What are the supply voltage and reference requirements for these DACs?
Both the AD7801BRZ and AD7805BR operate from a single +2.7 V to +5.5 V supply. Each device requires an external reference voltage to set the output voltage range. The reference input range and output span should be confirmed from the official Analog Devices datasheets for each part number.
Can the AD7805BR be used as a drop-in replacement for the AD7801BRZ in an existing design?
No. Because the AD7805BR is a 10-bit device in a 28-lead package and the AD7801BRZ is an 8-bit device in a 20-lead package, a direct drop-in replacement is not possible. A redesign of the PCB footprint, digital interface width, and control logic would be required, and the system resolution and timing must be revalidated.
What are the package and temperature range specifications for the AD7801BRZ and AD7805BR?
The AD7801BRZ is offered in a 20-lead SOIC package, and the AD7805BR is offered in a 28-lead SOIC package. Both are specified for the industrial temperature range of −40°C to +85°C. Package and temperature grade details should be confirmed against the official Analog Devices datasheets for the exact orderable part numbers.