ISG4042-T Datasheet, PDF (1/8 Pages) SIRENZA MICRODEVICES – 5V CATV MODEM RF TUNER AND TRANSMITTER

ISG4042-T
5 V CATV MODEM RF TUNER AND
TRANSMITTER
FEATURES
• TWO WAY DOCSIS BASED DESIGN:
91-857 MHz Downstream
5-42 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 in³
46.2 x 49.0 x 12.5 mm., 28.5 cc.
• DIGITAL LINEAR RF TRANSMITTER:
All Harmonics meets DOCSIS @ 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 ISG4042-T is an RF tuner/transmitter designed for use in
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
TX band and the RX band. The receiver channel selects and
converts QAM signals in the RX 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 performance.
ELECTRICAL CHARACTERISTICS (VCC = 5 V, ±2 %, TA = 25°C) ^{(see note 4)}
SYMBOLS
PARAMETERS
UNITS
MIN
TYP
MAX
RF Performance (RX)
fOP
Operating Frequency Range (Center to Center)
MHz
91
857
Input Signal Level
dBmV
-15
15
VAGC
NFMAX
Maximum Voltage Gain
Automatic Voltage Gain Control Range
IF Automatic Voltage Gain Control
Noise Figure (at Max Voltage Gain)
Phase Noise at 10 kHz Offset
LO Radiation at RF Input
dB
57
dB
45
V
0
3.3
dB
8
10
dBc/Hz
-85
-82
dBm
-40
Resolution
Lock Time (end to end channel)
Input Impedance (Nominal)
kHz
msec.
ohms
31.25
18
75
RLIN
Input Return Loss
Channel Bandwidth USA
Output Frequency
dB
6
MHz
6
MHz
43.75
Passband Ripple over 5.36 MHz Bandwidth
Image Rejection
Inband Group Delay
CSO¹
CTB¹
Output Frequency Offset
dB
1
2
dB
50
ns
100
dBc
45
50
dBc
45
50
kHz
-35
+35
Output IF Voltage Level
Output IF Load
VPP
1
KΩ
1
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 user’s 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 Sirenza’s 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.
303 S. Technology Court, Broomfield, CO 80021
303-327-3030
www.sirenza.com
1
REV. F
4/1/2005