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參數(shù)資料
| 型號： | TEA7063DP |
| 廠商： | 意法半導體 |
| 英文描述： | SPEECH CIRCUIT WITH POWER MANAGEMENT |
| 中文描述： | 語音電路電源管理 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 228K |
| 代理商： | TEA7063DP |
In this condition an internal connection is acti-
vated from line DTMF output (pin 16) to Receive
Output (pin 20) with an attenuationGRS = 38.5dB
to provide acoustic feedback of the DTMF emis-
sion.
4. A.G.C AND SIDETONE PROGRAMMING
4.1 Programmable Controls
AGCand sidetone attack and disonnectpoints (or
currents) are programmable externally through
two independents pins, I-start (pin 9) and I-slope
(pin 15).
4.2 I-Start
(pin9)
An external resistor RLL connected between I-
start (pin 9) and Microprocessor Supply (pin 19)
controls the attack point of AGC and ZAL (an-
tisidetoneZ).
ILL is theline current at which the control starts.
Formulas for ILL and RLL with R9 = 100K are:
ILL =2880
RLL
+
11mA
2880
(
ILL
11mA
)
RLL =
4.3 I-Slope
(pin 15)
An external resistor RLS connected between
I-slope (pin 15) and Microprocessor Supply (pin
19) controls the disconnected point of AGC and
ZAS (antisidetone Z). ILS is the line current at
which the control stops. Formulas for ILS and
RLS with R9 = 100K are:
ILS =4680
RLS
+
ILL;
4680
(
ILS
ILL
)
RLS =
4.4 A.G.C. OFF
(pin9 and 15)
Programming ILL and ILS respectively higher
than 70mA and 450mA is forcing the IC in AGC
OFF Condition.
Suggestedexternal componentsare:
RLL = 51K
and RLS = 10K
In this case sending, receiving gain and sidetone
compensation are independentof the line lenght.
Pins1 and 2 can be connectedto each othersav-
ing 5 passive externalcomponentsat pin2.
4.5 Secret Function for Privat
e (pin14)
The two separate thresholds for sending and Re-
ceiving Mute (pin 14) allow ”Secret Function”
(only microphone muted).
Pin14 can be set:
a) between 0.25V and 0.8Vfor speechmode,
b) between 1.6V and 2.1V for ”secret” mode (mi-
crophone muted),
c) between2.7V and 3.3Vfor ”all muted” mode
Figure7
TEA7063
9/15
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