Specifications

COMPANY CONFIDENTIAL
21
- UART interface
- UIM support (Two dual-voltage (1.8/2.85 V) ports)
2.2 RF transceiver
The SDR845 device is a highly-integrated multimode, multiband RF CMOS transceiver IC
that interfaces with the SDX20-2 device through QLink. The SDR845 is the first integrated
single-chip RFIC for LTE downlink carrier aggregation (CA) up to 100 MHz BW supporting
5DL CA (two of the carriers must be contiguous). It also supports LTE uplink carrier
aggregation up to 20 MHz + 20 MHz for interband and 40 MHz for contiguous intraband.
2.2.1.1 Key features of SDR845
 Qualcomm Technologies, Inc. (QTI) 28 nm RF CMOS devi
ce with an integrated modem
subsystem in a PSP package (0.35 mm pitch)
 Integrating RF receive, transmit, and the QLink controller
 First QTI single-chip RF device to support three-carrier
 First QTI single-chip RF device to have dedicated MIMO inputs
2.2.1.2 Key benefits of SDR845
 First QTI single-chip RF device to have dedicated MIMO inputs
 QTI RF device that supports high-speed digital interface (QLink) between SDR845 and
 SDX20-2/SDM845
 QTI RF device supporting external GRFCs that can be
used for RF front-end
communication and general-purpose functions
 QTI single-chip RF device that supports the integrated envelope tracking (ET) feature
for both Tx chains (ETDAC0 and ETDAC1)
 One independent differential low noise amplifier (LNA) port, supporting Tx feedback for
all WAN bands (UL)
 Most highly integrated RF transceiver
 Up to 10 receivers running concurrently
 Simplified DC power requirements for this highly integrated RFIC with built-in
microprocessor
2.3 Power management IC
T77W968 system uses the Qualcomm PMX20. The PMX20 device integrates all the wireless
product’s power management, general housekeeping, and user interface support functions
into a single mixed-signal IC. Its versatile design is suitable for any multimode, multiband
product. Since the PMX20 includes so many diverse functions, its operation is more easily
T77W968C9