ISG3300EU
FEATURES
• TWO WAY DOCSIS COMPLIANT:
100-860 MHz Downstream
5-65 MHz Upstream
• INTERFACES DIRECTLY WITH QAM DEMOD/MOD ICs
• INCORPORATES ALL RF FILTERS INCLUDING
TX ANTI ALIASING
• DIGITAL LINEAR RF TRANSMITTER:
All Harmonics -51 dBc @ 58 dBmv : ≥ 50 dB Combined
Gain Control w/ Digital Step Attenuator
• SUPERIOR SNR:
37 dB for 64 QAM / 256 QAM (TYP)
• RUGGED DESIGN/NO MICROPHONICS:
SMD Components, "Coiless"
5 V CATV MODEM RF TRANSCEIVER
DESCRIPTION AND APPLICATIONS
The ISG3300EU is a complete RF transceiver designed for
use in European cable modem applications. The transceiver
integrates a diplex filter, triple conversion receiver and transmit
AGC amplifier with antialiasing filters (see Figure 1). The
diplex filter provides over 40 dB of isolation between the TX
band and the RX band. The receiver channel selects and
converts QAM signals in the RX band down to the desired IF
sampling frequency. It also provides the necessary gain con-
trol input power to the QAM demodulator. The RF transmitter
section combined with the digital modulator provides a digitally
controlled gain range of ≥ 50 dB, while maintaining excellent
linearity performance.
California Eastern Laboratories
PRELIMINARY DATA SHEET
ELECTRICAL CHARACTERISTICS (VCC = 5 V, VCC2 = 24 V, TA = 25°C)
Notes:
1. Optional Output 36.125 MHz Available
2. 110 Channels at +15 dBmV/tone
PART NUMBER ISG3300EU
SYMBOLS PARAMETERS UNITS MIN TYP MAX
RF Performance (RX)
fOP Operating Frequency Range MHz 100 860
Input Signal Level dBmV -20 15
Gain Range dB 25 75
VAGC Automatic Gain Control Voltage RF 0 3.3
VAGC Automatic Gain Control Voltage IF 0 3.3
NFMAX Noise Figure (Max Gain) dB 8 10
Phase Noise at 10 kHz Offset dBc/Hz -83 -80
LO Radiation at RF Input dBm -40
Resolution KHz 62.5
Lock Time (end to end channel) msec. 18
Input Impedance (Nominal) ohms 75
RLIN Input Return Loss dB 6
Channel Bandwidth EU MHz 8
Output Frequency1MHz 8.125
Passband Ripple dB 1 2
Image Rejection dB 50
Inband Group Delay ns 100
CSO2dBc 45
CTB2dBc 45
Frequency Offset KHz -35 +35
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