User's Manual

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❒ Connectivity:
- USB 2.0 HS with built-in USB PHY
- UART interface
- UIM support (dual voltage)
2.2 RF transceiver
The WTR1605 device is a highly integrated and versatile RF CMOS transceiver IC that can
be used in multimode, multiband applications – including Rx diversity. The WTR1605 IC is
the RF transceiver IC within compatible Qualcomm MDM9615 chipsets.
The WTR1605 IC integrates advanced receive and transmit features into a 4.91 × 5.47 ×
0.63 mm package to simplify handset design, minimize parts count, and reduce DC power
consumption. These advanced Rx/Tx features include:
 Multimode, multiband RF transceiver functions:
 GNSS receiver functions
 Fully integrated LO generation and distribution circuits to support all the RF operating
band and mode combinations
 Primary, diversity, and GNSS receivers that can operate simultaneously
 Tx power detector for monitoring the transmit power levels
 The GSM receiver can share the secondary paths with CDMA, WCDMA, and LTE
diversity receivers
 Qualcomm’s intelligent receiver technology for CDMA modes:
 Low operating voltages that help save battery current and allows the WTR IC power to
be supplied by the PMIC’s switching mode power supply (SMPS) circuits for even
greater power savings
2.3 Power management IC
T77H468 system uses the Qualcomm PM8018. Qualcomm has worked with Maxim
Integrated Products Inc. to develop a custom PMIC solution for use with the T77H468
platform.