PRELIMINARY DATA SHEET
5 V CATV MODEM RF TRANSCEIVER ISG3300A1
FEATURES
• TWO WAY DOCSIS COMPLIANT:
91-860 MHz Downstream
5-42 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 / 35 dB for 256 QAM (TYP)
• RUGGED DESIGN/NO MICROPHONICS:
SMD Components, "Coiless"
DESCRIPTION AND APPLICATIONS
The ISG3300A1 is a complete RF transceiver designed for use
in cable modem applications. The transceiver integrates a
diplex filter, triple conversion receiver and transmit AGC
amplifier (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 control input power to the DSP.
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
ISG3300A1
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 USA
Output Frequency
1
Passband Ripple
Image Rejection
Inband Group Delay
CSO
2
CTB
2
Frequency Offset
Notes:
1. Optional Output Frequency of 43.75 MHz Available
2. 110 Channels at +15 dBmV/tone
MHz
dBmV
dB
91
-20
25
0
0
8
-83
-40
62.5
18
75
6
5.70
50
6
5.75
1
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
5.80
2
100
45
45
+35
-35
California Eastern Laboratories
5/99
CEL [ CALIFORNIA EASTERN LABS ]
