SL6140

SL6140 SL6140 400MHz Wideband AGC Amplifier DS2159 Issue no 5.0 July 1999 Features Ordering Information G G G G G G 400MHz Bandwidth (RL=50Ω) High voltage Gain 45dB (RL=1kΩ) 70dB Gain Control Range High Output Level at Low Gain Surface Mount Plastic Package Low Cost SL6140/NA/MP Industrial temperature range miniature plastic package SL6140/NA/MPTC Tape and Reel Applications G G G RF/IF Amplifier High Gain Mixers Video Amplifiers Description The SL6140 is an integrated broadband AGC amplifier, designed on an advanced bipolar process. The amplifier provides over 15dB of linear gain into 50Ω at 400MHz. Gain control is also provided with over 70dB of dynamic range. The SL6140 offers over 45dB of voltage gain with an RL of 1kΩ. The SL6140 (Figure 3) is a high gain amplifier with an AGC control capable of reducing the gain of the amplifier by over 70dB. The gain is adjustable by applying a voltage to the AGC input via an external resistor (RAGC), the value of which adjusts the curve of gain reduction versus control voltage (see Figure 4). As the output stage of the amplifier is an open collector the maximum voltage gain is determined by RL. With load resistance of 1kΩ the single ended voltage gain is 45dB and with a load resistance of 50Ω the voltage gain is 15dB (20log10 VOUT/VIN). Another parameter that depends on the load resistance is the bandwidth: 25MHz for RL = 1kΩ, as compared with 400MHz for RL = 50Ω. RL is chosen to give either the required bandwidth or voltage g...