Part A
AD7302BRZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6529 個数
- Package
- SOIC-20
- Series
- データ取得 - デジタル/アナログコンバータ (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD7302BRZ and AD7304YRZ are both dual 8-bit voltage-output DACs from Analog Devices sharing a compatible functional architecture, but they differ in digital interface, reference configuration, and specified operating temperature range. The AD7302BRZ offers a parallel interface with external reference capability, while the AD7304YRZ uses a serial (SPI-compatible) interface with an internal reference option. Because the interface and reference topology differ, direct drop-in substitution is not possible without validating the host system's digital bus and reference strategy; however, both devices are functionally comparable DACs suitable for similar signal-generation roles once those differences are addressed.
Digital Interface
Validation required
Reference Configuration
Validation required
Resolution and Channel Count
High match
Operating Temperature 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 | AD7302BRZ | AD7304YRZ | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 2 | 4 | Determines how many independent analog outputs are available; a 4-channel part can replace a 2-channel part only if the extra channels are unused or the board is redesigned. |
| Resolution | 8 bits | 8 bits | Sets the number of discrete output levels (256 steps); matching resolution ensures equivalent output granularity and accuracy for a given reference. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Defines the operating voltage window; identical ranges allow the parts to be used in the same 3 V or 5 V systems without supply changes. |
| Interface Type | Parallel (8-bit) | Parallel (8-bit) | Determines how the host writes data to the DAC; matching parallel interfaces allow drop-in compatibility with the same microcontroller bus. |
| Package / Pin Count | 20-lead SOIC (0.295") | 16-lead SOIC (0.295") | Affects PCB footprint and pinout; different pin counts require layout changes and prevent direct drop-in substitution. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +125 °C | Defines the ambient range over which specifications are guaranteed; the wider range of the AD7304YRZ offers more margin in harsh environments. |
| Output Type | Voltage output (buffered) | Voltage output (buffered) | Buffered voltage outputs drive loads directly without external op-amps; matching output type preserves the analog signal chain design. |
| Reference Input | External reference | External reference | Both require an external reference to set full-scale output; identical reference architecture allows reuse of the same reference circuit. |
| INL (Integral Nonlinearity) | ±1 LSB (max) | ±1 LSB (max) | Specifies worst-case deviation from the ideal transfer function; equal INL means comparable DC accuracy and linearity performance. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7302BRZ | AD7304YRZ |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Analog Devices Inc. |
| Part Status | Active | Active |
| Number of Bits | 8 | 8 |
| Number of D/A Converters | 2 | 4 |
| Settling Time | 2µs | 2µs |
| Output Type | Voltage - Buffered | Voltage - Buffered |
| Differential Output | No | No |
| Data Interface | Parallel | SPI |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 2.7V ~ 5.5V, ±5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| INL / DNL(LSB) | ±1 (Max), ±1 (Max) | ±1 (Max), ±1 (Max) |
| Architecture | Current Source | R-2R |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 125°C |
Frequently asked questions
What are the key differences between the AD7302BRZ and AD7304YRZ?
The AD7302BRZ is a dual 8-bit voltage-output DAC, while the AD7304YRZ is a quad 8-bit voltage-output DAC. Both are fabricated on a CMOS process and feature a parallel interface, but they differ in channel count, package pin count, and specified temperature grade. The AD7302BRZ is specified over the 0°C to +70°C commercial temperature range, whereas the AD7304YRZ is specified over the −40°C to +105°C extended industrial temperature range.
Are the AD7302BRZ and AD7304YRZ pin-compatible?
No. The AD7302BRZ is offered in an 8-lead SOIC package, while the AD7304YRZ is offered in a 16-lead SOIC package. The different pin counts and pin functions prevent direct pin-to-pin substitution; the PCB layout must be redesigned for the target device.
What is the resolution and architecture of these DACs?
Both the AD7302BRZ and AD7304YRZ are 8-bit voltage-output digital-to-analog converters with a resistor-string (string DAC) architecture. They provide rail-to-rail output swing and are operated from a single +2.7 V to +5.5 V supply.
What interface do the AD7302BRZ and AD7304YRZ use?
Both devices use a parallel microprocessor-compatible interface. The AD7302BRZ provides a dual DAC with a single 8-bit parallel data bus, while the AD7304YRZ provides a quad DAC with a parallel interface. Data is written to the DAC registers via the parallel bus using chip-select and write control signals.
What are the supply voltage and reference requirements?
Both the AD7302BRZ and AD7304YRZ operate from a single supply of +2.7 V to +5.5 V. Each device provides a reference input pin that sets the full-scale output voltage; the output range is 0 V to VREF. The reference input must be driven by an external reference source within the supply rails.
Can the AD7302BRZ be used as a drop-in replacement for the AD7304YRZ in an existing design?
No. The AD7302BRZ is a dual-channel 8-bit DAC in an 8-lead SOIC package, while the AD7304YRZ is a quad-channel 8-bit DAC in a 16-lead SOIC package. The channel count, package footprint, pinout, and temperature grade differ, so a direct drop-in replacement is not possible without redesigning the PCB and validating the system requirements.
What are the operating temperature ranges for the AD7302BRZ and AD7304YRZ?
The AD7302BRZ is specified for the commercial temperature range of 0°C to +70°C. The AD7304YRZ is specified for the extended industrial temperature range of −40°C to +105°C. Designs requiring operation below 0°C or above +70°C should use the AD7304YRZ or another appropriately rated variant.