RF Amplifier Companion Chip for Dual-Band Cellular Subscriber Terminal
Description
MC33170 RF Amplifier Companion Chip for Dual-Band Cellular Subscriber Terminal
The MC33170 is a complete solution for drain modulated dual–band GSM 900MHz and DCS–1800MHz Power Amplifiers.
Thanks to its internal decoder, the MC33170 drastically simplifies the interface between the PAs and the baseband logic section, providing an immediate gain in part count but also in occupied copper area.
The device is also ready for 1V platforms since it accepts logic high control signals down to 900mV@25°C.
A priority management system ensures the negative is present before authorizing the power modulation, giving the necessary ruggedness to the final design.
This function can easily be disabled for PAs not requiring a negative bias.
The device is able to directly drive an external P or N–channel with the possibility to linearize the overall response via the internal high–performance control amplifier and easily implement system gain.
Finally, an LDO delivers a stable voltage, usable for external biasing purposes.
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1
TSSOP–14 DTB SUFFIX CASE 948G
PIN CONNECTIONS
Band Selection Tx Enable GSM-900 1 2 3 14 Common Enable
13 Negative Regulator 12 Out 11 Vboost 10 INV 9 8 NINV LDO
DCS-1800 4 PA Start-up Gnd Vbat 5 6 7
• 1V platform compatible: ON voltage = 900mV, OFF voltage = • • • • •
300mV max Priority management system prevents power modulation before negative bias establishes High performance 4.
5MHz gain–bandwidth product operational amplifier Drives N or P–channel MOSFET 2.
5V low–noise LDO Idle mode input for very low power consumption (standby mode)
(Top View) ORDERING INFORMATION
Device MC33170DTB Package TSSOP–14 Shipping 96 Units / Rail
MC33170DTBR2 TSSOP–14 2500 / Tape & Reel NINV 9 Shutdown 2.
5 V Low Dropout 2.
5 V Vbat Vboost Vbat (5.
5 V Max) 11 7
Shutdown LDO Output Common Enable TX Enable Band Selection 2.
5 V 8 + 14 2 1 Open–Collector BG Decoder BD B′G 1 mA Continuous 3 GSM–900 4 700 mA Peak 50 mA Continuous Clip to –5 V 13 10 6 12 Out -
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