MAX2130EVKIT【PDF 7/8 页】EVAL KIT MAX2130

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Broadband, Two-Output, Low-Noise

Amplifier for TV Tuner Applications

Dynamic Linearity Adjustment

The LNA and loop-out amplifier linearity can be dynam-

ically adjusted by varying the amount of current

sourced by the BIAS port. The BIAS port is internally

biased to 1.2V. A resistor, R BIAS , connected from BIAS

to ground sets the bias current. An additional resistor,

R ADJ , placed from the BIAS port to an external voltage

source, such as a digital-to-analog converter (DAC),

varies the current sourced by the BIAS port. Choosing

R ADJ = R BIAS = 20k Ω and varying the voltage of the

DAC from ground to 2.4V effectively varies the resis-

tance seen from the BIAS port from 10k Ω to an open

circuit. See Typical Application Circuit .

Pin Configuration

TOP VIEW

The DAC output voltage, V ADJ , required to set an equiv-

alent resistance to ground, R EQ , seen by the BIAS port,

can be calculated with the following equation:

V ADJ = 2.4V - (R BIAS ? V BIAS ) / R EQ

where R ADJ = R BIAS , V BIAS = 1.2V, R EQ ≥ 10k Ω .

Power-Supply Bypassing

Proper voltage-supply bypassing is essential for high-

frequency circuit stability. Bypass the V CC pin with a

1000pF capacitor in parallel with a 47pF capacitor,

located as close to the V CC pin as possible. Refer to

the MAX2130 EV kit for additional information.

Chip Information

TRANSISTOR COUNT: 167

V CC

OUT1

GND

MAX2130

BIAS

GND

GND 4

μ MAX-EP

OUT2

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