Overview
The AD8309ARUZ from Analog Devices Inc. is a complete IF limiting amplifier designed to provide an accurate logarithmic (decibel) measure of the input signal, known as the Receiver Signal Strength Indication (RSSI) function, over a dynamic range of 100 dB. It also features a programmable limiter output, making it useful for frequencies from 5 MHz to 500 MHz. The device is easy to use, requiring few external components, and operates on a single supply voltage of +2.7 V to +6.5 V at 16 mA typical. It is fabricated on an advanced complementary bipolar process using silicon-on-insulator isolation techniques and is available in a 16-lead TSSOP package with an operating temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Supply Voltage | 2.7 | 6.5 | V | ||
| Supply Current | 16 | mA | |||
| Power-Up Time | 500 | ns | |||
| Sleep Current | <1 | µA | |||
| Input Resistance | From INHI to INLO | 800 | 1000 | 1200 | Ω |
| Input Capacitance | From INHI to INLO | 2.5 | pF | ||
| Dynamic Range | –91 | +9 | dBV | ||
| Bandwidth | 850 | MHz | |||
| Total Gain | 72 + 18 | dB | |||
| RSSI Response Time | 67 | ns |
Key Features
- Accurate logarithmic (decibel) measure of the input signal over a dynamic range of 100 dB.
- Programmable limiter output useful from 5 MHz to 500 MHz.
- Single supply voltage of +2.7 V to +6.5 V at 16 mA typical.
- Low power consumption: under 50 mW at 3 V.
- Fast power-up time of 500 ns and low sleep current of under 1 µA.
- Fully differential inputs with moderately high impedance (1 kΩ in parallel with 2.5 pF).
- Constant phase with typical 80 ps delay skew.
- Stable RSSI scaling over temperature and supplies with a slope of 20 mV/dB and an intercept of –95 dBm.
- Differential outputs up to 10 mA, 2.4 V p-p.
- Available in a 16-lead TSSOP package with an operating temperature range of –40°C to +85°C).
Applications
- Receivers for frequency and phase modulation).
- Wide range IF and RF power measurement).
- Receiver Signal Strength Indication (RSSI)).
- Low-cost radar and sonar signal processing).
- Instrumentation: network and spectrum analyzers).
- Satellite receivers, cable TV amplifiers, RF radio systems, and microwave transceivers).
Q & A
- What is the dynamic range of the AD8309ARUZ?
The AD8309ARUZ has a dynamic range of 100 dB, from –91 dBV to +9 dBV).
- What is the frequency range of the AD8309ARUZ?
The AD8309ARUZ operates from 5 MHz to 500 MHz).
- What is the supply voltage range for the AD8309ARUZ?
The supply voltage range is from +2.7 V to +6.5 V at 16 mA typical).
- How long does it take for the AD8309ARUZ to power up?
The power-up time is approximately 500 ns).
- What is the sleep current of the AD8309ARUZ?
The sleep current is under 1 µA).
- What is the input impedance of the AD8309ARUZ?
The input impedance is 1 kΩ in parallel with 2.5 pF).
- What is the total gain of the AD8309ARUZ?
The total gain is 72 dB from the main amplifier cells plus an additional 18 dB from the programmable output stage).
- How does the AD8309ARUZ handle temperature variations?
The RSSI scaling is stable over temperature and supply variations, with parameters determined by a band-gap voltage reference).
- What is the RSSI response time of the AD8309ARUZ?
The RSSI response time is nominally 67 ns (10%–90%)).
- In what package is the AD8309ARUZ available?
The AD8309ARUZ is available in a 16-lead TSSOP package).
