28

ACE9040

Gain and filter set-ups for TACS, AMPS and user control bits: Transmit

TACS

AMPS

User control bit(s)

Microphone amp

22 or 32 dB

22 or 32 dB

MIG

Soft limiter

0 to - 30 dB

0 to - 30 dB

Internal

INPSENSE gain adjust

+ 8 dB

+ 8 dB

INPS[4:0]

(- 12.8 to + 12 dB)

(- 12.8 to + 12 dB)

TXBPF TX bandpass filter

0 dB

0 dB

Fixed

HFGAIN, TX Handsfree attenuator

0 to - 49 dB

0 to - 49 dB

THF[2:0]

Compressor: Compression about

Fixed

unaffected level. (707 mVrms, - 3 dBV)

Pre-emphasis gain control

- 7 dB

- 11 dB

TACS & AMPS

(Internal compressor)

Pre-emphasis gain control

0 dB

0 dB

Fixed

HARD LIMIT, Hard deviation limiter

+ 16.5 dB @ 4.85V

+ 13.5 dB @ 3.75V

V485 pin

+ 13.5 dB @ 3.75V

+ 16.5 dB @ 4.85V

TXLPF TX low pass filter

- 8 dB

- 8 dB

Fixed

AUDIODEV,

0 dB

0 dB

AUDEV[3:0]

(-2.8 to + 3.2 dB)

(-2.8 to + 3.2 dB)

TXSENSE, signal

0 dB

0 dB

TXSEN[3:0]

(-2.8 to +3.2 dB)

(-2.8 to +3.2 dB)

Nominal TX Channel Gain

(bypassed compressor)

Function Controlled by TACS & AMPS Bits

TACS

AMPS

Internal pre-emphasis gain control.

TACS = - 7.0 dB

1

0

AMPS= - 11.0 dB

0

1

APPLICATIONS INFORMATION

To help with system set up tables 22 to 25 show

ACE9040's functions and their respective controlling bits.

Table 23 shows the gains and filter characteristics pre-

determined when setting the TACS & AMPS cellular system

selection bits. Tables 23 & 24 show these functions

respectively for the transmit and receive sections of ACE9040.

Table 25 shows the four control messages with an example of

the data to turn all ACE9040 functions on.

Table 22 Functions Controlled by TACS & AMPS Bits

Notes:

1. Above the unaffected (0 dB gain) level the compressor attenuates and below this level it provides gain.

2. MIC gain = 22 dB

Table 23 Transmit gain and filter set-ups for TACS, AMPS and user control bits