ACE9040 datasheet(20/33 Pages) MITEL

20 / 33 page

ACE9040

CIRCUIT OPERATING MODES

ACE9040 has three operating modes: Operate, Standby

and Sleep. In Operate mode all parts of the circuit are active,

except for any explicitly powered down and the DTMF genera-

tor which only powers up when tones are generated. The pin

STBY is pulled high in Operate mode to supply V

DD to external

audio circuits, such as a compander.

Standby Mode

Standby mode is used when the cellular terminal is

waiting for a call and is selected by an “Operation mode”

control message with bit PD at “1”. In this mode all analog

circuits, data paths, filters and their clock drivers are powered

down giving a greatly reduced supply current. In standby

mode all switch and level controls retain their previous state,

the pin STBY is not driven removing the V

DD supply from

external circuits. To leave Standby mode an operate com-

mand should be given by using an “Operation mode” control

message with bit PD at “0”.

Sleep Mode

Sleep mode is the same as Standby but without a clock

input. To enter sleep mode the standby command should be

given and after a delay of at least 20

µs the SCLK clock

stopped. To wake-up from sleep mode, the the SCLK clock

must be started and after a delay of at least 100

µs an operate

command given.

Power on Reset

At power up ACE9040 is put into Standby mode.

ACE9040 is set up by the controlling processor via the serial

interface using four control messages: “Operation”, “Initializ-

ing mode 0”, “Initializing mode 1” and “Handsfree”. Usually

the “Operation” control message would be sent last as it

contains the power down/up bit PD.

CELLULAR SYSTEM SELECTION

Two control bits are used to set the filter responses and

gain levels for the AMPS or TACS cellular systems. These bits

are TACS in control message “Initializing mode 1” and AMPS

in control message “Handsfree mode” and select the system

as shown in table 19.

Fig. 11 Transmit Voice Path

TRANSMIT VOICE PATH

Table 19 Cellular System Selection

Bits

System

AMPS

TACS

Selected

Not valid

TACS

AMPS

Not valid

SLO

IPS

10nF

SOFTLIMIT

0 to -30dB

22/32 dB

MIG

MLI

MIC.AMP

MIS

SOFT

LIMIT

3 and 97%

LEVELS

DETECT

-7dB TACS

-11dB AMPS

Compressor bypass

0dB AMPS/TACS

92% LEVEL

DETECT

TEST[1:0]

GAIN

CONTROL

COMP[2:1]

0dB @ 1kHz

+6dB/octave

PRE-

EMPAHSIS

PREEMPH

+15.4dB @ 3.75V

+16dB @ 4.85V

HARD

LIMIT

-8dB

TXLPF

TEST[1:0]

DTMF

INSPENSE

TEST[0]

-2.8 to + 3.2dB

AUDEV[3:0]

AUDIODEV

VMIDTX

TXM

TLPO

DRIVER

COMPRESSOR

2dB : 1dB

COMP[2:1]

TLPO

PREIN

33nF

100nF

82nF

COUT

VMIDTX

CRCIN

CRCOUT

CIN

VMIDTX

10nF

SIDETONE

TO RECEIVE

VOICE PATH

HFGAIN

TXBF

TBPO

TXC

68nF

RXC

HFS

HANDSFREE

RECTIFIER

0 to -49dB

THF[2:0]

0dB

NOM 8dB

-4 to +20.8dB

INPS[4:0]

DTMFM

ACE9040 Datasheet(PDF) 20 Page - Mitel Networks Corporation

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