PRELIMINARY DATA SHEET
5 V CATV MODEM RF TRANSCEIVER 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
T
X
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"
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 T
X
band and the R
X
band. The receiver channel selects and
converts QAM signals in the R
X
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= 5 V, V
CC2
= 24 V, T
A
= 25°C)
PART NUMBER
SYMBOLS
PARAMETERS
UNITS
MIN
ISG3300EU
TYP
MAX
RF Performance (R
X
)
f
OP
Operating Frequency Range
Input Signal Level
Gain Range
V
AGC
Automatic Gain Control Voltage RF
V
AGC
Automatic Gain Control Voltage IF
Noise Figure (Max Gain)
NF
MAX
Phase Noise at 10 kHz Offset
LO Radiation at RF Input
Resolution
Lock Time (end to end channel)
Input Impedance (Nominal)
RL
IN
Input Return Loss
Channel Bandwidth EU
Output Frequency
1
Passband Ripple
Image Rejection
Inband Group Delay
CSO
2
CTB
2
Frequency Offset
Notes:
1. Optional Output 36.125 MHz Available
2. 110 Channels at +15 dBmV/tone
MHz
dBmV
dB
100
-20
25
0
0
8
-83
-40
62.5
18
75
6
8
8.125
1
50
dB
dBc/Hz
dBm
KHz
msec.
ohms
dB
MHz
MHz
dB
dB
ns
dBc
dBc
KHz
860
15
75
3.3
3.3
10
-80
2
100
45
45
+35
-35
California Eastern Laboratories
5/99
CEL [ CALIFORNIA EASTERN LABS ]
