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TEA7063DP Fiches technique(PDF) 11 Page - STMicroelectronics

No de pièce TEA7063DP
Description  SPEECH CIRCUIT WITH POWER MANAGEMENT
Download  15 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TEA7063DP Fiches technique(HTML) 11 Page - STMicroelectronics

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7. INTERNAL DESCRIPTION OF CURRENT
MANAGEMENT
7.1 Internal Power Supply Management
R9 fixes the line power supply management.
R9 fixes the values of: Iear,Iup,Iref and ILS.
A current line information is used to modifie the
values of Iear,Iup,Iref and ILS between a minimum
and a maximum values.
On Fig 10:
The transmit output stage is represented by a cur-
rent source (Itr). The Itr value depends of the DC
voltage on VLINE (pin 16) and RZAC value.
The other internal stages connected to VLINE (pin
16) are represented by a constant 1.3mA current
source.
7.2 DC Characteristics (internal)
The DC characteristic is equals to:
VLINE (pin 16) = VC (pin 17) + R6
• Iint
Iint is the sum of all the current sources con-
nected on VC (pin 17):
[Ip +Iref + Vpin17 / (r7 + r8)]
-Ip is the bias internal operational amplifiers
power supply.
-Iref =1 / 3
• (Vrefi / R9); with Vrefi = 470mV
-Iref = 156/R9 mA
The current line information changes Iint value;
at low line current (6mA): Iint =4V/ R9 +60
µA
at low line current (IL = ILb): Iint =8V / R9 + 60
µA
7.3 Microcontroller Supply (internal)
Iup = [(p2 / r2)
• Iref + 0.3] mA = [(p2 / r2) • 156 /
R9) + 0.3] mA
The current line information changes p2/r2 value;
at low line current (6mA): p2 / r2 = 70
at a line current (IL = ILb): p2 / r2 = 820
7.4 Earphone Current Supply (internal)
Iear = (p1 / r1)
• Iref mA = (p1 / r1) • (156 / R9) mA
The current line information changes p1/r1 value;
at low line current (6mA): (p1 / r1) = 200
at a line current (IL = ILb): p1 / r1 = 2700
The maximum peak dynamic on the earphone is:
Vpear =Zear
• Iear
7.5 Transmit Output Stage (internal)
The output stage bias current depends of the DC
voltage on pin 16 and on RZAC impedance.
Itr =
0.1425
• VLINE − 0.517
RZ
(RZ is the resistor
connected betwee pin3 and the ground)
7.6 Loudspeaker Current Source (internal)
The current source for external peripherals has
two slopes:
- First slope; before Iear,Iup,Itr and Iint are stabi-
lized at their maximum values: (IL = ILb)
ILS = 0.285
• IL
- Second slope; after Iear,Iup,Itr and Iint are sta-
bilized at their maximum values: (for IL > ILb)
∆ (ILS) = 0.91 •∆(ILINE
Iear,Iup,Itr and Iint are stabilized at their maximum
values between 16 and 26mA, the absolute IL
value depends of R9 value. The line current (ILb)
where Iear,Iup, Itr,Iint are stabilized at their maxi-
mum values and where the slope of ILS change
is:
ILb =
Iear + Iup
+ Itr + Iint + 1.3
0.715
7.7 Numerical Example
1) R9 = 100K
Ω; R6 = 25KΩ
♦ DC characteristic = 6V for Iint max:
= 5V for Iint min:
Iint min (IL = 6mA) = 4 /100K + 60 = 100
µA
Iint min (IL = ILb) = 8 /100K + 60 = 140
µA
Vpin17 = 2.5V
⇒ R6 = 25KΩ ⇒
Vpin16 min (IL = 6mA) = 2.5 + 25
• 100E - 3 = 5V
Vpin16 max (IL = ILb) = 2.5 + 25
• 140E - 3 = 6V
♦ Current Sources
Iup min (IL = 6mA) = 0.4mA
Iup max (IL = ILb) = 1.6mA
Iear min (IL = 6mA) = 0.3mA
Iear max (IL = ILb) = 4.2mA
with RZ =75
Itr min (IL = 6mA) = 2.6mA
Itr max (IL = ILb) = 4.5mA
ILS min (IL = 6mA) = 1.3mA
♦ ILb
ILb =
1.6
+ 4.2 + 4.5 + 0.14 + 1.3
0.715
mA
ILb = 16.5mA
ILS (for IL = ILb) = 0.285
• ILb = 4.7mA
♦ at IL = 100mA:
∆(ILS) = 0.91 • ∆(IL) = 0.91 • (100 - 16.5) = 76mA
ILS = 4.7 + 76 = 80.7mA
2) R9 = 56K
Ω; R6 = 18KΩ
♦ DC characteristic = 6.1V for Iint max:
♦ ∆Χ χηαραχτε
= 4.8V for Iint min:
TEA7063
11/15


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