Part A
AD8307ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6156 PCS
- Package
- SOIC-8
- Series
- Linear - Amplifiers - Special Purpose
Replacement verdict
Not a drop-in replacement
The AD8307ARZ and AD8300AR are fundamentally different devices and cannot be treated as interchangeable. The AD8307ARZ is a logarithmic RF detector amplifier, while the AD8300AR is a 12-bit digital-to-analog converter; they differ in function, signal path, package, and electrical characteristics, so substitution is not feasible without a complete redesign.
Different device function
Different signal path
Different package
Different supply requirements
Parts at a glance
Part B
AD8300AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8679 PCS
- Package
- SOIC-8
- 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 | AD8307ARZ | AD8300AR | Why it matters |
|---|---|---|---|
| Function | Logarithmic amplifier / RSSI detector (demodulating logarithmic amplifier) | 12-bit digital-to-analog converter (DAC) | These are fundamentally different device types; one processes RF signals logarithmically while the other converts digital codes to analog voltage, so they are not functionally substitutable. |
| Package | 8-lead SOIC (R-8) | 8-lead SOIC (R-8) | Package compatibility affects PCB footprint and assembly; both share the same SOIC-8 footprint here, but the internal function differs. |
| Supply voltage range | 2.7 V to 5.5 V single supply | +5 V nominal (single supply) | Operating voltage range determines system-level power supply compatibility and whether the part can run from lower-voltage rails. |
| Signal frequency range | DC to 500 MHz | Not applicable (DC voltage output DAC) | The AD8307 handles RF input frequencies up to 500 MHz, whereas the AD8300 is a baseband DAC with no RF signal path, making them non-interchangeable in RF designs. |
| Resolution / dynamic range | 92 dB dynamic range, logarithmic output | 12-bit resolution | The AD8307 provides logarithmic signal-strength measurement over a wide dynamic range, while the AD8300 provides linear 12-bit digital-to-analog conversion. |
| Output type | Analog voltage proportional to log of input (RSSI) | Analog voltage output from digital code | Output behavior differs: the AD8307 outputs a log-scaled voltage from an RF input, while the AD8300 outputs a voltage set by a digital input word. |
| Input type | Differential RF input signal | Digital (parallel) input code | The input interface is completely different (analog RF vs digital bus), so they cannot be substituted in the same circuit. |
| Typical application | RSSI, received signal strength indication, power measurement, RF/IF detection | Digital-to-analog conversion, control loops, signal generation | Application domains differ entirely, confirming these parts serve distinct roles and are not drop-in replacements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8307ARZ | AD8300AR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | - | 12 |
| Number of D/A Converters | - | 1 |
| Settling Time | - | 14µs (Typ) |
| Output Type | - | Voltage - Buffered |
| Differential Output | - | No |
| Data Interface | - | SPI, DSP |
| Reference Type | - | Internal |
| Voltage - Supply, Analog | - | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | - | 2.7V ~ 5.5V |
| INL / DNL(LSB) | - | ±0.5, ±0.5 |
| Architecture | - | R-2R |
| Operating Temperature | - | -40°C ~ 85°C |
| Type | Logarithmic Amplifier | - |
| Applications | Receiver Signal Strength Indication (RSSI) | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
Are the AD8307ARZ and AD8300AR functionally interchangeable?
No. The AD8307ARZ is a 500 MHz, 92 dB logarithmic amplifier (log amp) that converts an RF/IF signal to a decibel-scaled DC output, while the AD8300AR is a 12-bit digital-to-analog converter (DAC) with a voltage output. They perform entirely different functions and are not substitutes for one another.
What are the core functions of the AD8307ARZ and AD8300AR?
The AD8307ARZ is a monolithic logarithmic amplifier/detector providing a linear-in-dB output proportional to input signal level, used for RSSI and power measurement. The AD8300AR is a 12-bit, serial-input, voltage-output DAC intended for digital-to-analog signal conversion.
Do the AD8307ARZ and AD8300AR use the same package and pinout?
Both devices are offered in 8-lead SOIC (R-8) packages, but their pin functions differ because the internal circuits are unrelated. The AD8307ARZ pinout is dedicated to log-amp signal input, output, and supply; the AD8300AR pinout is dedicated to DAC reference, serial data, clock, and output. They are not pin-compatible replacements.
What are the key verified specifications of the AD8307ARZ?
The AD8307ARZ operates from a single 2.7 V to 5.5 V supply, provides a 92 dB dynamic range, a nominal 25 mV/dB logarithmic slope, and operates over a 500 MHz input bandwidth. It is specified for the -40 °C to +85 °C industrial temperature range.
What are the key verified specifications of the AD8300AR?
The AD8300AR is a 12-bit voltage-output DAC with a serial interface, operating from a single 2.7 V to 5.5 V supply. It provides 12-bit resolution and is specified over the -40 °C to +85 °C industrial temperature range in an 8-lead SOIC package.
Can the AD8307ARZ and AD8300AR share the same power supply rail in a design?
Both devices are specified for single-supply operation from 2.7 V to 5.5 V, so a common rail within that range is electrically permissible. However, because their functions differ, sharing a rail does not imply interchangeability; each device must be designed into its own signal path.
Which device should be selected for RF power measurement versus analog output generation?
For RF/IF signal strength measurement or RSSI, the AD8307ARZ logarithmic amplifier is the appropriate choice. For generating an analog voltage from digital code, the AD8300AR 12-bit DAC is the appropriate choice. Selection depends on the signal-chain function, not on package similarity.
Are the AD8307ARZ and AD8300AR RoHS compliant?
Both the AD8307ARZ and AD8300AR are supplied in RoHS-compliant SOIC packages per Analog Devices ordering information. Designers should confirm the specific orderable part number and its compliance status against the current manufacturer datasheet before finalizing a bill of materials.