MAX2370ETM+T Maxim Integrated Products, MAX2370ETM+T Datasheet - Page 6

• Manufacturer Part Number: MAX2370ETM+T
• Description: RF Transmitter IC TRANSMITTER QUAD-EP
• Manufacturer: Maxim Integrated Products

Specifications of MAX2370ETM+T

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Complete 450MHz Quadrature Transmitter
6
(MAX2370 EV kit, V
455MHz, f
T
2, 10, 11, 16,
A
17, 32–35,
= +25°C, unless otherwise noted.)
43, 47
_______________________________________________________________________________________
PIN
8, 9
12
1
3
4
5
6
7
IF
= 120MHz, R
IFIN+, IFIN-
CC_
TXGATE
V
RFOUT
NAME
RBIAS
LOCK
CCDRV
IDLE
N.C.
V
CC
= SHDN = IDLE = TXGATE = CS = 3.0V, f
BIAS
-10
-20
-30
-40
-50
-60
-70
-80
-90
10
0
CENTER: 455MHz, SPAN: 5MHz, RBW: 30kHz
= 10kΩ, V
P
OUT
= +8dBm
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.
D i g i tal Inp ut. D r i ve to logic-high for nor m al op er ati on. Logic-low on TXG ATE shuts d ow n ever ythi ng
excep t the RF P LL, IF P LL, IF V C O. A sm al l RC l ow p ass can b e used to fi l ter d i g i tal noi se.
Differential IF Inputs to the RF Upconverter. IFIN+ and IFIN- are internally biased to typically V
1.5V. The input impedance for this port is nominally 400Ω 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 10kΩ. This value can be altered to optimize the linearity of
the driver stage.
RF OUTPUT SPECTRUM
GC
FREQUENCY
= 2.5V, registers set according to Table 1, input voltage at I and Q = 130mV
Typical Operating Characteristics (continued)
REF
= 19.2MHz, LO input power = -15dBm, f
-100
-10
-20
-30
-40
-50
-60
-70
-80
-90
239.8
P
FUNCTION
REF
IF LOCAL OSCILLATOR SPECTRUM
= -10dBm
239.9
FREQUENCY
240.0
240.1
(MHz)
240.2
Pin Description
240.3
LO
= 575MHz, f
RMS
differential,
RFOUT
CC
-
=