Part A
AD8307ARZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6156 ПКС
- Package
- SOIC-8
- Series
- Линейные - Усилители - Специальное назначение
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
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.