ISG4042EU-T
5 V CATV MODEM RF TUNER AND
TRANSMITTER
FEATURES
TWO WAY EURO DOCSIS BASED DESIGN:
112-858 MHz Downstream
5-65 MHz Upstream
SINGLE SUPPLY 5 V OPERATION:
With Built-in Linear Regulation
SINGLE AGC CONTROL
Simplifies Modem Calibration
ULTRA SMALL SIZE:
1.9 x 2.0 x 0.5 in., 1.9 in
3
46.2 x 49.0 x 12.5 mm., 28.5 cc.
DIGITAL LINEAR RF TRANSMITTER:
All Harmonics -55 dBc @ 58 dBmV (see note 2)
> 56 dB Gain Range (0.5 dB steps)
INTERFACES DIRECTLY WITH QAM MOD/DEMOD IC's:
(see note 3)
DESCRIPTION AND APPLICATIONS
The ISG4042EU-T is an RF tuner/transmitter designed for
use in EURO DOCSIS cable modem applications. It is a
complete solution that interfaces directly with QAM Mod/
Demod IC's. The tuner/transmitter integrates a diplex filter,
dual conversion receiver, transmit AGC amplifier, and other
RF filtering (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 IF sampling frequency. It also provides the
necessary gain control to adjust the input power to the DSP
chip. The RF transmitter section provides > 56 dB of digitally
controlled range while maintaining excellent linearity perfor-
mance.
ELECTRICAL CHARACTERISTICS
(V
CC
= 5 V, ±2 %, T
A
= 25°C)
(see note 4)
SYMBOLS
PARAMETERS
UNITS
MHz
dBmV
dB
dB
V
dB
dBc/Hz
dBm
kHz
msec.
ohms
dB
MHz
MHz
dB
dB
ns
dBc
dBc
kHz
V
PP
KΩ
MIN
112
-15
57
45
0
8
-85
-40
62.5
18
75
6
8
36.125
1
50
100
45
45
-35
50
50
+35
1
1
3.3
10
-82
TYP
MAX
858
15
RF Performance (R
X
)
f
OP
Operating Frequency Range (Center to Center)
Input Signal Level
Maximum Voltage Gain
Automatic Voltage Gain Control Range
IF Automatic Voltage Gain Control
V
AGC
NF
MAX
Noise Figure (at Max Voltage Gain)
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
Output Frequency
Passband Ripple over 6.952 MHz Bandwidth
Image Rejection
Inband Group Delay
CSO
1
CTB
1
Output Frequency Offset
Output I
F
Voltage Level
Output I
F
Load
Notes:
1. 110 Channels at +15 dBmV/tone.
2. 160K Symbol rate; under DOCSIS PHY - 17 high condition.
3. Application specification for TI 4040/4042.
4. Specifications apply to test conditions listed.
* PHY 7/17/18 Data available upon request.
Performance tests and ratings for Sirenza Microdevices products were performed internally by Sirenza and measured using specific computer systems and/or components and reflect the approximate
performance of the products as measured by those tests. Any difference in circuit implementation, test software, or test equipment may affect actual performance. The information provided herein is
believed to be reliable at press time and Sirenza Microdevices assumes no responsibility for the use of this information. All such use shall be entirely at the users own risk. Prices and specifications for
Sirenza Microdevices products are subject to change without notice. Buyers should consult Sirenza Microdevices standard terms and conditions of sale for Sirenzas limited warranty with regard to its
products. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. Sirenza Microdevices does not authorize or warrant any product for use in life-
support devices and/or systems.
2
303 S. Technology Court, Broomfield, CO 80021
303-327-3030
1
www.sirenza.com
4/1/2005
REV. A
SIRENZA [ SIRENZA MICRODEVICES ]
