ISG4042-T 반도체 회로 부품 판매점
5V CATV MODEM RF TUNER AND TRANSMITTER
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 Sirenza Microdevices |
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)
www.DataSheet4U.com
fOP
VAGC
NFMAX
RLIN
Operating Frequency Range (Center to Center)
Input Signal Level
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
Resolution
Lock Time (end to end channel)
Input Impedance (Nominal)
Input Return Loss
Channel Bandwidth USA
Output Frequency
Passband Ripple over 5.36 MHz Bandwidth
Image Rejection
Inband Group Delay
CSO1
CTB1
Output Frequency Offset
Output IF Voltage Level
Output IF Load
MHz
dBmV
dB
dB
V
dB
dBc/Hz
dBm
kHz
msec.
ohms
dB
MHz
MHz
dB
dB
ns
dBc
dBc
kHz
VPP
KΩ
91
-15
45
0
6
50
45
45
-35
57
8
-85
-40
31.25
18
75
6
43.75
1
50
50
1
1
857
15
3.3
10
-82
2
100
+35
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.
303 S. Technology Court, Broomfield, CO 80021
303-327-3030
www.sirenza.com
1
REV. F
4/1/2005
ELECTRICAL CHARACTERISTICS (VCC = 5 V, ±2%, TA = 25°C) (see note 2)
SYMBOLS
PARAMETERS
UNITS
RF Performance (TX)
fOP Operating Frequency Range
GMAX (Gain Word = 255)
GMIN (Gain Word =48)
Output Step Size
Flatness (5 to 42 MHz)
Amplitude Ripple Over 1.28 MHz
2nd Harmonic Level (FIN = 65 MHz, POUT = +58 dBmV)1
3rd Harmonic Level (FIN = 65 MHz, POUT = +58 dBmV)1
Input Impedance
RLOUT
Output Return Loss
TX ON/OFF On/Off Setting Time
Group Delay (5-42 MHz)
TX Transient Spurs
TX Transient Duration
Power Requirements
Supply Voltage V1 RX
Supply Voltage V1 TX
Supply Ripple Voltage V1 RX
Supply Current
ICC1 (RX) Supply Current 1 (RX)
ICC1 (TX)
Supply Current 1 (TX) TXEN = High
Supply Current 1 (TX) TXEN = Low
Physical Interface
To the CATV Network
MHz
dB
dB
dB
dB
dB
dBmV
dBmV
Ω
dB
µs
ns
mV
µs
V
V
mV
mA
mA
mA
To the Motherboard
Notes:
1. 160K Symbol rate; under DOCSIS PHY - 17 high condition.
2. Specifications apply to test conditions listed.
ISG4042-T
MIN TYP MAX
5 42
26 27
-27 -26
0.5
1.7 2.5
0.6
-48 -45
-48 -45
300
6
3.2 5
100
7
3.2 5
4.75 5 5.25
4.75 5 5.25
100
310
120
8
Female
F-Connector
16 Pin Header
150
12
ABSOLUTE MAXIMUM RATINGS
(TC = 25°C unless otherwise noted)
SYMBOLS
PARAMETERS
UNITS RATINGS
VIN RF Input Voltage
dBmV
60
VCC1 (RX) Supply Voltage (RX)
V +6.5
VCC (TX) Supply Voltage (TX)
V +5.5
TOP Operating Temperature
°C -40 to 75
TSTG
Storage Temperature
°C -40 to 75
TSOL
Soldering Temperature
°C
260
tSOL Soldering Time
sec. 4
Note:
1. Operation in excess of any one of these parameters may result
in permanent damage.
303 S. Technology Court, Broomfield, CO 80021
303-327-3030
2
www.sirenza.com
REV. F
4/1/2005
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