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