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MAX2368 Datasheet PDF : 22 Pages
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Complete Dual-Band
Quadrature Transmitters
Pin Description (continued)
PIN
MAX2366 MAX2367 MAX2368
NAME
FUNCTION
16, 17
16, 17
Differential IF Outputs. These ports are active when the register bit IF_BAND
is 1. They do not support FM mode. These pins must be inductively pulled up
—
IFOUTH-,
IFOUTH+
to VCC. A differential IF bandpass filter is connected between this port and
IFINH+ or IFINH-. The pullup inductors can be part of the filter structure. The
differential output impedance of this port is nominally 600Ω. The transmission
lines from these pins should be short to minimize the pickup of spurious sig-
nals and noise.
18, 19
20
21
22
23, 24
25, 26
27
28
29
30, 31
—
20
21
22
23, 24
25, 26
27
28
29
—
18, 19
IFOUTL+,
IFOUTL-
Differential IF Outputs. These ports are active when the register bit IF_BAND
is 0. These pins must be inductively pulled up to VCC. A differential IF band-
pass filter is connected between this port and IFINL+ and IFINL-. The pullup
inductors can be part of the filter structure. The differential output impedance
of this port is nominally 600Ω. The transmission lines from these pins should
be short to minimize the pickup of spurious signals and noise.
20
21
22
23, 24
25, 26
27
VGC
VCC
VCC
Q+, Q-
I+, I-
SHDN
RF and IF Variable-Gain Control Analog Input. VGC floats to +1.5V. Apply
+0.5V to +2.6V to control the gain of the RF and IF stages. An RC filter on
this pin may be used to reduce DAC noise or PDM clock spurs from this line.
Supply Pin for the IF VGA. Bypass with a capacitor as close to the pin as
possible. The bypass capacitor must not share its ground vias with any other
branches.
Supply for the I/Q Modulator. Bypass with capacitor as close to the pin as
possible. The bypass capacitor must not share its ground vias with any other
branches.
Differential Q-Channel Baseband Inputs to the Modulator. These pins go
directly to the bases of a differential pair and require an external common-
mode bias voltage.
Differential I-Channel Baseband Inputs to the Modulator. These pins go
directly to the bases of a differential pair and require an external common-
mode bias voltage.
Shutdown Input. A logic low on SHDN shuts down the entire IC. An R-C low-
pass filter may be used to reduce digital noise.
28
VCC
Supply Pin to the VCO Section. Bypass as close to the pin as possible. The
bypass capacitor should not share its vias with any other branches.
29
IFLO
NBuffered LO Output. Control the output buffer using register bit BUF_EN
and the divide ratio using the register bit BUF_DIV.
30, 31
TANKL-,
TANKL+
Differential Tank Pins for the Low-Frequency IF VCO. These pins are internally
biased to +1.6V.
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