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Complete 450MHz Quadrature Transmitter
Typical Operating Characteristics (continued)
(MAX2370 EV kit, V CC_ = SHDN = IDLE = TXGATE = CS = 3.0V, f REF = 19.2MHz, LO input power = -15dBm, f LO = 575MHz, f RFOUT =
455MHz, f IF = 120MHz, R BIAS = 10k ? , V GC = 2.5V, registers set according to Table 1, input voltage at I and Q = 130mV RMS differential,
T A = +25 ° C, unless otherwise noted.)
RF OUTPUT SPECTRUM
IF LOCAL OSCILLATOR SPECTRUM
10
0
-10
-20
-30
P OUT = +8dBm
-10
-20
-30
-40
-50
P REF = -10dBm
-40
-50
-60
-70
-80
-90
-60
-70
-80
-90
-100
FREQUENCY
239.8
239.9
240.0
240.1
240.2
240.3
CENTER: 455MHz, SPAN: 5MHz, RBW: 30kHz
FREQUENCY (MHz)
Pin Description
PIN
1
2, 10, 11, 16,
17, 32 – 35,
43, 47
3
4
5
6
7
8, 9
12
NAME
RFOUT
N.C.
LOCK
V CCDRV
IDLE
V CC
TXGATE
IFIN+, IFIN-
RBIAS
FUNCTION
Transmitter RF Output. This open-collector output requires a pullup inductor to the supply voltage,
which can be part of the output matching network.
No Connection. Leave these pins open-circuit. Some of these pins are internally connected.
Open-Drain Output Indicating LOCK Status of the IF and/or the RF PLLs. Requires an external
pullup resistor. Control using configuration register bits LD_MODE[1:0].
Power Supply for the RF Driver Stage. Bypass to PC board ground with a capacitor placed as
close to the pin as possible. Do not share capacitor ground vias with other ground connections.
Digital Input. Drive to logic-high for normal operation. Logic-low on IDLE shuts down everything
except the RF PLL. A small RC lowpass filter can be used to filter digital noise.
Power Supply for the Upconverter Stage. Bypass to PC board ground with a capacitor placed as
close to the pin as possible. Do not share capacitor ground vias with other ground connections.
Digital Input. Drive to logic-high for normal operation. Logic-low on TXGATE shuts down everything
except the RF PLL, IF PLL, IF VCO. A small RC lowpass can be used to filter digital noise.
Differential IF Inputs to the RF Upconverter. IFIN+ and IFIN- are internally biased to typically V CC -
1.5V. The input impedance for this port is nominally 400 ? differential. AC-couple the output of the
differential IF filter to this port. Keep the differential lines as short as possible to minimize the
effects of stray pickup.
Bias Resistor Connection. Internally biased to typically 1.18V. An external resistor must be
connected from RBIAS to ground to set the bias current for the upconverters and PA driver
stages. The nominal resistor value is 10k ? . This value can be altered to optimize the linearity of
the driver stage.
6
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