Overview
The AD8318ACPZ-REEL7, produced by Analog Devices Inc., is a demodulating logarithmic amplifier designed to accurately convert RF input signals to corresponding decibel-scaled output voltages. This device operates over a wide frequency range of 1 MHz to 8 GHz, making it versatile for various RF and microwave applications. The AD8318 employs the progressive compression technique through a cascaded amplifier chain, each stage equipped with a detector cell, to achieve high accuracy and stability over temperature and supply variations.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Frequency Range | 1 MHz | 8 GHz | |||
| Input Impedance | INHI (Pin 14) and INLO (Pin 15) | 957||0.71 Ω||pF | |||
| Dynamic Range | TA = 25°C | 70 dB | |||
| Dynamic Range | −40°C < TA < +85°C | 42 dB | |||
| Maximum Input Level | ±1 dB error | −2 dBm | |||
| Minimum Input Level | ±1 dB error | −60 dBm | |||
| Slope | −24.3 mV/dB | ||||
| Intercept | 19.8 dBm | ||||
| Rise Time | PIN = −10 dBm to off, 10% to 90% | 10 ns | |||
| Fall Time | PIN = −10 dBm to off, 90% to 10% | 12 ns | |||
| Supply Voltage | 5 V | ||||
| Current Consumption | 68 mA |
Key Features
- Wide bandwidth: 1 MHz to 8 GHz
- High accuracy: ±1.0 dB over 55 dB range (f < 5.8 GHz)
- Stability over temperature: ±0.5 dB
- Low noise measurement/controller output (VOUT)
- Pulse response time: 10 ns/12 ns (fall/rise)
- Integrated temperature sensor
- Small footprint LFCSP package
- Power-down feature: <1.5 mW at 5 V
- Single-supply operation: 5 V at 68 mA
- Fabricated using high-speed SiGe process
Applications
- RF transmitter PA setpoint control and level monitoring
- RSSI measurement in base stations, WLAN, WiMAX, and radars
Q & A
- What is the frequency range of the AD8318?
The AD8318 operates over a frequency range of 1 MHz to 8 GHz. - What is the dynamic range of the AD8318?
The dynamic range is 70 dB at 25°C and 42 dB over the temperature range of −40°C to +85°C. - What is the maximum input level for the AD8318?
The maximum input level is −2 dBm with a ±1 dB error. - What is the minimum input level for the AD8318?
The minimum input level is −60 dBm with a ±1 dB error. - What is the rise and fall time of the AD8318?
The rise time is 10 ns and the fall time is 12 ns. - Does the AD8318 have an integrated temperature sensor?
Yes, the AD8318 includes an integrated temperature sensor. - What is the power consumption of the AD8318 in power-down mode?
The power consumption in power-down mode is less than 1.5 mW at 5 V. - What is the supply voltage and current consumption of the AD8318?
The supply voltage is 5 V, and the current consumption is 68 mA. - In what package is the AD8318 available?
The AD8318 is available in a small footprint LFCSP package. - What process is used to fabricate the AD8318?
The AD8318 is fabricated using a high-speed SiGe process.
