LTC6430-20_15 Datasheet, PDF (9/28 Pages) Linear Technology – High Linearity Differential RF/IF Amplifier/ADC Driver

LTC6430-20
PIN FUNCTIONS
GND (Pins 8, 14, 17, 23, Exposed Pad Pin 25): Ground.
For best RF performance, all ground pins should be con-
nected to the printed circuit board ground plane. The
exposed pad (Pin 25) should have multiple via holes to
an underlying ground plane for low inductance and good
thermal dissipation.
+IN (Pin 24): Positive Signal Input Pin. This pin has an
internally generated 1.8V DC bias. A DC-blocking capacitor
is required. See the Applications Information section for
specific recommendations.
–IN (Pin 7): Negative Signal Input Pin. This pin has an
internally generated 1.8V DC bias. A DC-blocking capacitor
is required. See the Applications Information section for
specific recommendations.
V_CC (Pins 9, 22): Positive Power Supply. Either or both
V_CC pins should be connected to the 5V supply. Both V_CC
pins are internally connected within the package. Bypass
the V_CC pin with 1000pF and 0.1µF capacitors. The 1000pF
capacitor should be physically close to a V_CC pin.
+OUT (Pin 18): Positive Amplifier Output Pin. A transformer
with a center tap tied to V_CC or a choke inductor tied to 5V
supply is required to provide DC current and RF isolation.
For best performance select a choke with low loss and
high self resonant frequency (SRF). See the Applications
Information section for more information.
–OUT (Pin 13): Negative Amplifier Output Pin. A trans-
former with a center tap tied to V_CC or a choke inductor is
required to provide DC current and RF isolation. For best
performance select a choke with low loss and high SRF.
DNC (Pins 1 to 6, 10 to 12, 15, 19 to 21): Do Not Connect.
Do not connect these pins, allow them to float. Failure
to float these pins may impair the performance of the
LTC6430-20.
T_DIODE (Pin 16): Optional. A diode which can be forward
biased to ground with up to 1mA of current. The measured
voltage will be an indicator of the chip temperature.
BLOCK DIAGRAM
V_CC
9, 22
BIAS AND TEMPERATURE
COMPENSATION
24 ^+IN
7 ^–IN
20dB
GAIN
20dB
GAIN
GND
8, 14, 17, 23 AND PADDLE 25
+OUT ₁₈
T_DIODE ₁₆
–OUT ₁₃
643020 BD
For more information www.linear.com/LTC6430-20
643020f
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