Pin description – Rainbow Electronics MAX19993 User Manual
Page 18
MAX19993
Dual, SiGe, High-Linearity, 1200MHz to 1700MHz
Downconversion Mixer with LO Buffer/Switch
18
Pin Description
PIN
NAME
FUNCTION
1
RFMAIN
Main Channel RF Input. Internally matched to 50I. Requires an input DC-blocking capacitor.
2
TAPMAIN
Main Channel Balun Center Tap. Bypass to GND with 39pF and 0.033FF capacitors as close as
possible to the pin with the smaller value capacitor closer to the part.
3, 5, 7, 12,
20, 22, 24,
25, 26,
34
GND
Ground
4, 6, 10, 16,
21, 30, 36
V
CC
Power Supply. Bypass to GND with capacitors as close as possible to the pin, as shown in the
Typical Application Circuit.
8
TAPDIV
Diversity Channel Balun Center Tap. Bypass to GND with 39pF and 0.033FF capacitors as close as
possible to the pin with the smaller value capacitor closer to the part.
9
RFDIV
Diversity Channel RF Input. Internally matched to 50I. Requires an input DC-blocking capacitor.
11
IFD_SET
IF Diversity Amplifier Bias Control. Connect a resistor from this pin to ground to set the bias current
for the diversity IF amplifier. See the Typical Application Circuit.
13, 14
IFD+, IFD-
Diversity Mixer Differential IF Output +/-. Connect pullup inductors from each of these pins to V
CC
.
See the Typical Application Circuit.
15
IND_EXTD
Diversity External Inductor Connection. Connect to ground through a 0I resistor (0603) as close as
possible to the pin. For improved RF-to-IF and LO-to-IF isolation, contact the factory for details.
17
LO_ADJ_D
LO Diversity Amplifier Bias Control. Connect a resistor from this pin to ground to set the bias current
for the diversity LO amplifier. See the Typical Application Circuit.
18, 28
N.C.
No Connection. Not internally connected.
19
LO1
Local Oscillator 1 Input. This input is internally matched to 50I. Requires an input DC-blocking
capacitor.
23
LOSEL
Local Oscillator Select. Set this pin to high to select LO1. Set to low to select LO2.
27
LO2
Local Oscillator 2 Input. This input is internally matched to 50I. Requires an input DC-blocking
capacitor.
29
LO_ADJ_M
LO Main Amplifier Bias Control. Connect a resistor from this pin to ground to set the bias current for
the main LO amplifier. See the Typical Application Circuit.
31
IND_EXTM
Main External Inductor Connection. Connect to ground through a 0I resistor (0603) as close as
possible to the pin. For improved RF-to-IF and LO-to-IF isolation, contact the factory for details.
32, 33
IFM-, IFM+
Main Mixer Differential IF Output -/+. Connect pullup inductors from each of these pins to V
CC
. See
the Typical Application Circuit.
35
IFM_SET
IF Main Amplifier Bias Control. Connect a resistor from this pin to ground to set the bias current for
the main IF amplifier. See the Typical Application Circuit.
—
EP
Exposed Pad. Internally connected to GND. Solder this exposed pad to a PCB pad that uses mul-
tiple ground vias to provide heat transfer out of the device into the PCB ground planes. These mul-
tiple ground vias are also required to achieve the noted RF performance.