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MC13109

UNIVERSAL CT–1 SUBSYSTEM INTEGRATED CIRCUIT

Motorola => Freescale 

MC13109

ELECTRICAL CHARACTERISTICS (continued)

Pre–Amplifier/Expander/Rx Mute/Volume Control (See Figure 4)

The Pre–Amplifier is an inverting rail–to–rail output swing

the half supply reference so the input and output swing

operational amplifier with the non–inverting input terminal

capability will increase as the supply voltage increases. The

connected to the internal VB half supply reference. External

resistors and capacitors can be connected to set the gain and

frequency response. The expander analog ground is set to

volume control can be adjusted through the MPU interface.

The “Rx Audio In” input signal is ac coupled.

(Test Conditions: VCC = 2.6 V, TA = 25°C, fin = 1.0 kHz, Set External Pre–Amplifier R’s for Gain of 1, Volume Control = (0111).)

Characteristic

Condition

Input Measure

Pin

Pin

Symbol

Min

Typ

Max

Unit

Pre–Amp Open Loop

Gain

–

Rx Audio Pre–Amp AVOL

–

60

–

dB

In

Pre–Amp Gain

Bandwidth

–

Rx Audio Pre–Amp GBW

–

100

–

kHz

In

Pre–Amp Maximum

Output Swing

RL = 10 kΩ

Rx Audio Pre–Amp VOmax

–

VCC – 0.3

–

Vpp

In

Expander 0 dB Gain

Level

Vin = –10 dBV

Rx Audio E Out

G

In

–3.0

–0.11

3.0

dB

Expander Gain

Tracking

Vin = –20 dBV, Output Rx Audio E Out

Gt

Relative to G

In

Vin = –30 dBV, Output

Relative to G

–21

–19.65

–19

dB

–42

–39.42

–37

Total Harmonic

Distortion

Vin = –10 dBV

Rx Audio E Out

THD

–

0.5

–

%

In

Maximum Output

Increase input voltage Rx Audio E Out VOmax

–

–5.0

–

dBV

Voltage

until output voltage

In

THD = 5%, then

measure output

voltage. RL = 10 kΩ

Attack Time

Ecap = 1.0 µF,

Rx Audio E Out

ta

–

3.0

–

ms

Rfilt = 20 kΩ

In

(See Appendix B)

Release Time

Ecap = 1.0 µF,

Rx Audio E Out

tr

Rfilt = 20 kΩ

In

(See Appendix B)

–

13.5

–

ms

Compressor to

Expander Crosstalk

V (Rx Audio In)

= 0 Vrms,

Vin = –10 dBV

C In

E Out

CT

–

–

–70

dB

Rx Mute

Vin = –10 dBV

Rx Audio E Out

Me

–

–70

–

dB

No popping

In

detectable during Rx

Mute transitions

Volume Control Range Programmable through

–

–

VCrange

–14

–

MPU Interface

16

dB

Volume Control Steps Programmable through

–

–

VCn

–

16

–

–

MPU Interface

MOTOROLA ANALOG IC DEVICE DATA

7

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