tea1099h NXP Semiconductors, tea1099h Datasheet - Page 6

• Manufacturer Part Number: tea1099h
• Description: Speech And Handsfree Ic With Auxiliary Inputs/outputs And Analog Multiplexer
• Manufacturer: NXP Semiconductors

Philips Semiconductors
FUNCTIONAL DESCRIPTION
All data given in this chapter are typical values, except
when otherwise specified.
Supplies
L
REG
The supply for the TEA1099H and its peripherals is
obtained from the line. The IC generates a stabilized
reference voltage (V
This reference voltage is equal to 3.7 V for line currents
lower than 18 mA. It than increases linearly with the line
current and reaches the value of 6.1 V for line currents
higher than 45 mA. For line currents below 9 mA, the
internal reference voltage generating V
adjusted to a lower value. This is the so-called low voltage
area and the TEA1099H has limited performances in this
area (see Section “Low voltage behaviour”). This
reference voltage is temperature compensated.
1999 Apr 08
handbook, full pagewidth
INE INTERFACE AND INTERNAL SUPPLY
Speech and handsfree IC with auxiliary
inputs/outputs and analog multiplexer
AND
V
BB
)
ref
) between pins SLPE and GND.
RSEN
RENV
HFRX
TENV
TSEN
GALS
RNOI
TNOI
DLC
V BB
ESI
10
11
1
2
3
4
5
6
7
8
9
(
PINS
ref
is automatically
LN, SLPE,
Fig.2 Pin configuration.
TEA1099H
6
The voltage between pins SLPE and REG is used by the
internal regulator to generate the stabilized reference
voltage and is decoupled by means of a capacitor between
pins LN and REG. This capacitor converted into an
equivalent inductance realizes the set impedance
conversion from its DC value (R
by an external impedance).
The IC regulates the line voltage at pin LN and it can be
calculated as follows:
where:
I
I
I
V
I
line
x
SLPE
SLPE
LN
= current consumed on pin LN (approximately a few A)
= line current
=
= current flowing through the R
=
V
ref
I
line
+
–
R
I
SLPE
x
33
32
31
28
30
29
27
26
25
24
23
MGM297
I
SLPE
QR
DTMF
MIC
MIC
GNDTX
TXIN
GATX
TXOUT
IDT
SWT
VOL
SLPE
) to its AC value (done
SLPE
Product specification
TEA1099H
resistor