ISG4042-T Datasheet, PDF (3/8 Pages) SIRENZA MICRODEVICES – 5V CATV MODEM RF TUNER AND TRANSMITTER

PIN FUNCTIONS
PIN NO.
1
2
3
4
5
6
7
8
9
PIN NAME
GND
5V_TX
TXEN
TXIN+
TXIN-
LD_TX
NC
5V_RX
IFAGC
10
GND
11
CLOCK
12
DATA
13
LD_RX
14
GND
15
IF-
16
IF+
ISG4042-T
DESCRIPTION
Ground. Provides low inductance to ground plane.
Supply pin for the transmitter.
Enable pin for the power amplifier. The amplifier is shutdown when this pin is set low.
Non-inverted TX input.
Inverted TX input.
Latch enable pin for the transmitter serial interface. TTL-compatible inputs.
No Connection
Supply pin for the receiver.
The AGC pin is used to adjust gain in the IF amplifier. The pin has a positive gain vs.
voltage slope. 45 dB of gain control is available by the varying the voltage from 0 to 3.3 V.
Ground. Provides low inductance to ground plane.
Clock pin. High impedance CMOS input.
Serial data pin. High impedance CMOS input. MSB entered first.
Latch enable pin for the dual PLL. High impedance CMOS input. When LE goes HIGH, data
stored in the shift registers is loaded into one of the 4 latches determined by the 2 control bits.
Ground. Provides low inductance to ground plane.
Inverted final IF output.
Non-inverted final IF output.
FIGURE 1
91-857 MHz
CABLE
PLANT
5-42 MHz
PLL
DC/DC
43.75 MHz
QAM
DEMOD
Rx
REGULATOR
QAM
MOD
303 S. Technology Court, Broomfield, CO 80021
303-327-3030
3
www.sirenza.com
REV. F
4/1/2005