ML2712CH Просмотр технического описания (PDF) - Micro Linear Corporation
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ML2712CH Datasheet PDF : 22 Pages
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PRELIMINARY
ML2712
PIN DESCRIPTIONS (continued)
Pin # Signal Name I/O Type Description
24
GND
33
VCC8
29
GND
Regulated Power and Ground
12
RVCC1
14
GND
21
RVCC2
18
GND
42
RVCC3
44
GND
Transmitter Section
32
TRFI
I
31
GND
35
WBCP O (Analog)
Ground for 2LO Prescaler and Phase Detector
Supply Voltage for Mixers, 1LO Frequency Doubler, and Transmit PLL. A
bypass capacitor connected with minimum trace lengths from VCC8 to PCB
ground is recommended
Ground for Mixers, 1LO Frequency Doubler, and Transmit PLL
Regulated Bypass Output Supply Voltage for 1LO PLL Charge Pump. A bypass
capacitor connected with minimum trace lengths from RVCC1 to PCB ground is
recommended
Ground for 1LO PLL Charge Pump
Regulated Bypass Output Supply for 1LO Voltage Controlled Oscillator. A
bypass capacitor connected with minimum trace lengths from RVCC2 to PCB
ground is recommended
Ground for 1LO Voltage Controlled Oscillator
Regulated Bypass Output Supply for 2LO Voltage Controlled Oscillator. A
bypass capacitor connected with minimum trace lengths from RVCC3 to PCB
ground is recommended
Ground for 2LO Voltage Controlled Oscillator
Transmit RF Input signal. This signal, input to the Transmit Down Converter
Mixer should be AC coupled and matched to the nominal 50Winput
impedance
Transmit Signal Ground. Minimizing the lead trace length from this GND to
PCB ground to reduce inductance and resistance is recommended
Wideband PLL Charge Pump output
10
REF
I
Reference frequency input to Phase Locked Loops. Requires square wave input
3
LD
O (CMOS) Lock Detect output. Low output indicates this pin is in open drain. Two
Phase Locked Loops are frequency locked and requires 10kW pull-up
4
WBLD O (CMOS) Wideband PLL Lock Detect open drain output and requires 10kW pull-up
41
2LO
O
2LO output. Together with 2LOB provides a balanced 2LO output port for
input to Down Converter Mixer on ML2713. Requires 5KW external pull-up
resistor to VCC3 if not connected to ML2713
In Standby Mode, 2LOB and 2LO provide a calibration tone used to calibrate
the ML2713 IF Transceiver
40
2LOB
O
2LOI output. Together with 2LO provide a balanced 2LO output port for input
to Down Converter Mixer on ML2713 Requires 5KW external pull-up resistor to
VCC1 if not connected to ML2713
In Standby Mode, 2LO and 2LOB provide a calibration tone used to calibrate
the ML2713 IF Transceiver
25
1IF
I/O
IF Input/Output. In RECEIVE Mode, functions with 1IFB to present a balanced
first IF output port with 340W output impedance. Connection must be AC
coupled. It is recommended that the signal trace connected to this pin be
isolated from other signal or digital control lines to maintain receiver
sensitivity
In TRANSMIT Mode, functions with 1IFB to present a balanced first IF input
port with 340W input impedance. Connection must be AC coupled. It is
recommended that the signal trace connected to this pin be isolated from other
signal or digital control lines to maintain receiver sensitivity
January, 2000 PRELIMINARY DATASHEET
5
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