8-133
RF9986
Rev B1 010717
8
Pin
Function
Description
Interface Schematic
1NC
No connection. This pin may be grounded (recommended) or left open.
2VCC1
Supply voltage for the mixer and RF buffer amplifier. External RF
bypassing is required. The trace length between the pin and the bypass
capacitor should be minimized. The ground side of the bypass capaci-
tor should connect immediately to ground plane.
3VCC2
Supply voltage for the LNA. External RF bypassing is required. The
trace length between the pin and the bypass capacitor should be mini-
mized. The ground side of the bypass capacitor should connect imme-
diately to ground plane.
4GND1
Ground connection for the LNA. For best performance, keep traces
physically short and connect immediately to ground plane.
5LNA IN
RF Input pin for the LNA. This pin is internally DC-blocked and inter-
nally matched for minimum noise figure (NOT for minimum VSWR),
given a 50
Ω source impedance.
6GND2
Same as pin 4.
7GND3
Ground connection for the RF buffer amplifier. For best performance,
keep traces physically short and connect immediately to ground plane.
8NC
No connection. This pin may be grounded (recommended) or left open.
9GND4
Same as pin 7.
10
VCC3
Supply voltage for both LO buffer amplifiers. External RF bypassing is
required. The trace length between the pin and the bypass capacitor
should be minimized. The ground side of the bypass capacitor should
connect immediately to ground plane.
11
LO BUFF
EN
Enable pin for the LO output buffer amplifier. This is a digitally con-
trolled input. A logic "high" (
≥3.1V) turns the buffer amplifier on, and the
current consumption increases by 3mA (with -2dBm LO input). A logic
"low" (
≤0.5V) turns the buffer amplifier off.
12
LO IN
Mixer LO input pin. This pin is internally DC-blocked and matched to
50
Ω.
13
LO BUFF
OUT
Optional buffered LO output. This pin is internally DC-blocked and
matched to 50
Ω. The buffer amplifier is switched on or off by the volt-
age level at pin 11.
14
GND5
Ground connection for both LO buffer amplifiers. For best performance,
keep traces physically short and connect immediately to ground plane.
15
IF+
Open-collector IF output pin. This is a balanced output. The output
impedance is set by an internal 1000
Ω resistor to pin 16. Thus the dif-
ferential IF output impedance is 1000
Ω. The resistor sets the operating
impedance, but an external choke or matching inductor to VCC must be
supplied in order to bias this output. This inductor is typically incorpo-
rated in the matching network between the output and IF filter. Because
this pinis biasedto VCC, a DC blocking capacitor must be used if the IF
filter input has a DC path to ground.
16
IF-
Same as pin 15, except complementary output.
See pin 15.
17
GND6
Ground connection for the mixer. For best performance, keep traces
physically short and connect immediately to ground plane.
18
MIX RF IN
Mixer RF Input Pin. This pin is internally DC-blocked and matched to
50
Ω.
19
GND7
Same as pin 17.
150
Ω
VCC1
VCC4
BIAS
7.5 k
Ω
LO
BUFF
EN
1k
Ω
IF-
IF+
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