Datasheet LTC6432-15 (Analog Devices) - 9

LTC6432-15
PIN FUNCTIONS DNC (Pins 1, 2, 3, 4, 10, 11, 14, 16, 20, 21):
Do Not
–FDBK (Pin 12):
A 1µF capacitor is required between this Connect. Do not connect to these pins, allow them to float. pin and –OUT to extend the low frequency cutoff. Failure to float these pins may impair the performance of
–OUT (Pin 13):
Negative Amplifier Output Pin. A trans- the LTC6432-15. former with a center tap tied to VCC or a choke inductor is
NFILT2 (Pin 5):
A 1µF capacitor to ground is required to required to provide DC current and RF isolation. For best reduce the low frequency noise of the internal bias supply. performance select a choke with low loss and high Self
NFILT1 (Pin 6):
A 1µF capacitor to ground is required to Resonant Frequency (SRF). See Applications Information reduce the low frequency noise of the internal bias supply. Section for more information.
–IN (Pin 7):
Negative Signal Input Pin. This pin has an
T_DIODE (Pin 15):
Optional. A diode which can be forward internally generated 2V DC bias. A DC blocking capaci- biased to ground with up to 1mA of current. The measured tor is required. See Application Information for specific voltage will be an indicator of the chip temperature. recommendations.
+OUT (Pin 18):
Positive Amplifier Output Pin. A transformer
GND (Pins 8, 17, 23 Exposed Pad Pin 25):
Ground. For with a center tap tied to VCC or a choke inductor tied to 5V best RF performance, all ground pins should be connected supply is required to provide DC current and RF isolation. to the printed circuit board ground plane. The Exposed For best performance select a choke with low loss and Pad (Pin 25) should have multiple via holes to an under- high Self Resonant Frequency (SRF). See Applications lying ground plane for low inductance and good thermal Information Section for more information. dissipation.
+FDBK (Pin 19):
A 1µF capacitor is required between this
V
pin and +OUT to extend the low frequency cutoff.
CC (Pins 9, 22):
Positive Power Supply. Either or both VCC pins should be connected to the 5V supply. Pins 9 and
+IN (Pin 24):
Positive Signal Input Pin. This pin has an 22 are internally connected on chip. Bypass the VCC Pin internally generated 2V DC bias. A DC blocking capacitor is with 1000pF and 0.1µF capacitors. The 1000pF capacitor required. See Application Information Section for specific should be physically close to the VCC Pin. recommendations. 643215f For more information www.linear.com/LTC6432-15 9 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information DC Electrical Characteristics AC Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Test Circuit A Operation Applications Information Differential S Parameters Package Description Typical Application Related Parts