MT1570

MT1570
DESCRIPTION
The MicroStreamer™ MT1570 is a low-cost, programmable power amplifier IC that has been developed specifically for use
in CATV upstream applications. This amplifier can be combined with the MT2170 tuner to create a complete RF front end
for DOCSIS 3.0- compatible cable modems and gateways. The MT1570 supports four bonded upstream data channels to
be simultaneously transmitted In accordance with DOCSIS 3.0 requirements.
The MT1570 meets all DOCSIS requirements with outputs as high as 64 dBmV for a QPSK modulated signal. A 3-wire
digital serial bus is used to program the variable gain in 1 dB steps over a nominal range of 63 dB.
The IC operates from a nominal supply voltage of 5.0 V and dissipates a maximum of 2.2 W at the highest gain setting and
power settings. The MT1570 has programmable current modes that can be used to adjust the bias current of the output
stage resulting in reduced power consumption. This is useful in applications that can tolerate reduced linearity.
The MT1570 can be shutdown via an external control pin or via the 3-wire serial bus. In this mode the IC draws less than
150 μA while retaining its previously programmed gain and current mode state. A Transmit Disable mode turns off the
output stage while maintaining the nominal output impedance. Current draw is less than 30 mA in this mode.
The MT1570 is housed in a 20-pin Quad Flat No-Lead (QFN) package with an exposed paddle for improved thermal
dissipation. This allows it to be used in applications with a temperature range of -40 °C to +85 °C. The MT1570 is
compliant with the RoHS directive for the restriction of the use of certain hazardous substances in electrical and electronic
equipment.
KEY FEATURES
●
●
●
●
●
●
●
●
●
●
●
High impedance input
5 Volts power operation
64dBmV output power
High gain greater than 32 dB
Large gain range of 63 dB
1 dB step size
Low transmit NF
Low output noise in disable mode
Temperature range of -40°C to +85°C
DOCSIS 1.0, 1.1, 2.0, 3.0, and Euro-DOCSIS™ compatible
20-pin, 5 mm x 5 mm QFN package
BENEFITS
PRODUCT DETAILS
Applications
●
●
●
●
DOCSIS 3.0 Cable modems and gateways
Telephony over CATV
High-power DOCSIS 2.0 cable modems
CATV Set-top boxes
Absolute Maximum Ratings
Parameter
Min
Max
Unit
VCC
-0.7
6.0
V
Input common mode voltage
levels (all inputs)
-0.7
VCC + 0.7
V
125
°C
150
°C
Lead free solder temperature
for 5 seconds, x3
260
°C
Relative humidity
85
°C
Junction temperature
Storage Temperature range
-40
Environmental Requirements
Parameter
Max
Unit
Ambient operating temperature
85
°C
Die temperature
Min
125
°C
Relative humidity @ 40 °C
ambient
85
%
Electrical Characteristics
Parameter
Min
Typ
Max
Unit
Power Supply voltage
475
5.0
5.25
V
25
mVp-p
2.2
W
Power supply ripple, DC-500 KHz
Power dissipation; gain code 63,
current mode 3
1.9
Power dissipation; gain code 0,
current mode 3
0.5
Supply current: transmit-disable
mode
25
30
mA
60
150
μA
33.5
35
dB
3.6
V
0.8
V
Supply current: shutdown mode
Voltage Gain, gain code 63
32
Digital input high voltage
1.5
Digital input low voltage
Digital input current
W
0
Related Documents
●
●
●
●
●
●
●
●
●
PB-00156 MT1570 Product Brief (This Document)
DS-00105 MT1570 Data Sheet
AN-00010 MicroTuner™ Series Application Note for Serial Bus Interface
AN-00043 Surface Mount Assembly of Quad Flat No-lead (QFN) Packages
AN-00076 Thermal Design Considerations Application Note
BM-00236 EV Board Bill of Material
GR-00236 EV Board Gerber File
SC-00236 EV Board Schematic
UG-00236 EV Board Basic User’s Guide.
μA