mt1570 Microtune,Inc, mt1570 Datasheet

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mt1570

Manufacturer Part Number
mt1570
Description
Docsis 3.0 Upstream Amplifier
Manufacturer
Microtune,Inc
Datasheet

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Guide
MT1570
DOCSIS® 3.0 Upstream Amplifier
D
HIGH TRANSMIT POWER
D
A
F
ESIGNED FOR
ESCRIPTION
PPLICATIONS
DOCSIS 3.0 Cable modems and
gateways
Telephony over CATV
EATURES
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
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..
.
DOCSIS 3.0
..
AND
DOCSIS 2.0
High-power DOCSIS 2.0 cable modems
CATV Set-top boxes
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
MODEMS REQUIRING
Product Brief
Page 1 of 4

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mt1570 Summary of contents

Page 1

... 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 ...

Page 2

... Parameter Min Ambient operating temperature Die temperature Relative humidity @ 40 °C ambient 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 • ...

Page 3

... Clock input to serial 7 interface 8 Amplifier output enable input 9 Shutdown mode input (active low) 10 Power supply connection Figure 3 MT1570 Package Drawing Pin Description Output common-mode 11 bypass. Bypass to GND with 0.1μF capacitor 12 Ground connection 13 Amplifier negative output 14 Amplifier positive output 15 Ground connection ...

Page 4

... I ONTACT AND RDERING NFORMATION MT1570 DOCSIS 3.0 Upstream Amplifier Copyright © 1996 - 2009 Microtune, Inc. Microtune, Inc., 2201 10th Street, Plano, TX 75074, USA Tel: +1-972-673-1600, Fax: +1-972-673-1602, E-mail: sales@microtune.com, Web site: Microtune, the Microtune logo, and ClearTune are registered trademarks of Microtune, Inc. MicroTuner, MicroStreamer, and MicroCeiver are trademarks of Microtune, Inc ...

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