User's Guide

LE910Cx Hardware User Guide

1VV0301298 Rev. 1.04 - 2017-05-25

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Mode Average [Typical] Mode Description

3) Operative Mode (LTE)

LTE (0 dBm)

190mA LTE CAT 4 channel BW 20 MHz, RB=1, Tx = 0 dBm

(Test case: BAND 1, Channel 300)

LTE (22 dBm)

500mA LTE CAT 4 channel BW 20 MHz, RB=1, Tx = 22 dBm

(Test case: BAND 1, Channel 300)

4) Operative Mode (WCDMA)

WCDMA Voice 200mA WCDMA voice call (Tx = 10 dBm)

WCDMA HSDPA (0 dBm) 150mA WCDMA data call (Cat 14, Tx = 0 dBm, Max throughput)

WCDMA HSDPA (22 dBm) 310mA WCDMA data call (Cat 14, Tx = 22 dBm, Max throughput)

5) Operative Mode (GSM)

GSM Tx and Rx mode

GSM900 PL5 250mA

GSM voice call

DCS1800 PL0 170mA

GPRS 4 Tx + 1 Rx

GSM900 PL5 430mA

GPRS Sending Data mode (CS-4)

DCS1800 PL0 340mA

* Worst/best case current values depend on network configuration - not under module control.

NOTE:

The electrical design for the power supply must ensure a peak current output of at least 2A.

NOTE:

In GSM/GPRS mode, RF transmission is not continuous, but is packed into bursts at a base

frequency of about 216 Hz with relative current peaks as high as about 2A. Therefore, the power

supply must be designed to withstand these current peaks without big voltage drops. This means

that both the electrical design and the board layout must be designed for this current flow.

If the layout of the PCB is not well designed, a strong noise floor is generated on the ground. This

will reflect on all the audio paths producing an audible annoying noise at 216 Hz.

If the voltage drops during the peaks, current absorption is too high. The device may even shut

down as a consequence of the supply voltage drop.