INTEGRATED CIRCUITS
DATA SHEET
TEA1098
Speech and handsfree IC
Product specification
Supersedes data of 1999 May 20
File under Integrated Circuits, IC03
1999 Oct 14
Philips Semiconductors
Product specification
Speech and handsfree IC
FEATURES
Line interface
•
Low DC line voltage
•
Voltage regulator with adjustable DC voltage
•
Symmetrical high impedance inputs (70 kΩ) for
dynamic, magnetic or electret microphones
•
DTMF input with confidence tone on earphone and/or
loudspeaker
•
Receive amplifier for dynamic, magnetic or
piezo-electric earpieces (with externally adjustable gain)
•
Automatic Gain Control (AGC) for true line loss
compensation.
Supplies
•
Provides a strong 3.35 V regulated supply for
microcontrollers or diallers
•
Provides filtered power supply, optimized according to
line current
•
Filtered 2.0 V power supply output for electret
microphone
•
PD logic input for power-down.
Handsfree
•
Asymmetrical high input impedance for electret
microphone
•
Loudspeaker amplifier with single-ended rail-to-rail
output and externally adjustable gain
ORDERING INFORMATION
TYPE
NUMBER
TEA1098TV
TEA1098H
TEA1098UH
PACKAGE
NAME
VSO40
QFP44
−
DESCRIPTION
plastic very small outline package; 40 leads
plastic quad flat package; 44 leads (lead length 1.3 mm);
body 10
×
10
×
1.75 mm
bare die; on foil
TEA1098
•
Dynamic limiter on loudspeaker amplifier to prevent
distortion
•
Logarithmic volume control on loudspeaker amplifier via
linear potentiometer
•
Duplex controller consisting of:
– Signal and noise envelope monitors for both
channels (with adjustable sensitivities and timing)
– Decision logic (with adjustable switch-over and Idle
mode timing)
– Voice switch control (with adjustable switching range
and constant sum of gain during switching).
APPLICATIONS
•
Line powered telephone sets.
GENERAL DESCRIPTION
The TEA1098 is an analog bipolar circuit dedicated to
telephony applications. It includes a line interface, handset
(HS) microphone and earpiece amplifiers, handsfree (HF)
microphone and loudspeaker amplifiers and a duplex
controller with signal and noise monitors on both channels.
This IC provides a 3.35 V supply for a microcontroller or
dialler and a 2.0 V filtered voltage supply for an electret
microphone.
VERSION
SOT158-1
SOT307-2
−
1999 Oct 14
2
Philips Semiconductors
Product specification
Speech and handsfree IC
TEA1098
QUICK REFERENCE DATA
I
line
= 15 mA; R
SLPE
= 20
Ω;
Z
line
= 600
Ω;
f = 1 kHz; T
amb
= 25
°C
for TEA1098H and TEA1098TV; T
j
= 25
°C
for
TEA1098UH; AGC pin connected to LN; PD = HIGH; HFC = LOW; MUTE = HIGH; measured according to test circuits;
unless otherwise specified.
SYMBOL
I
line
V
SLPE
V
BB
V
DD
I
BB
I
BB(pd)
G
v(MIC-LN)
G
v(IR-RECO)
∆G
v(QR)
PARAMETER
line current operating range
stabilized voltage between SLPE
and GND
regulated supply voltage for
internal circuitry
regulated supply voltage on pin
V
DD
current available on pin V
BB
current consumption on V
BB
during power-down phase
voltage gain from pin MIC+/MIC−
to LN
voltage gain from pin IR
(referenced to LN) to RECO
gain voltage range between pins
RECO and QR
V
TXIN
= 3 mV (RMS);
R
GATX
= 30.1 kΩ
V
HFTX
= 15 mV (RMS)
V
HFRX
= 30 mV (RMS);
R
GALS
= 255 kΩ; I
line
= 70 mA
with R
SWR
referenced to
365 kΩ
CONDITIONS
normal operation
with reduced performance
I
line
= 15 mA
I
line
= 70 mA
I
line
= 15 mA
I
line
= 70 mA
V
BB
> 3.35 V + 0.25 V (typ.)
otherwise
in speech mode
in handsfree mode
PD = LOW
V
MIC
= 5 mV (RMS)
V
IR
= 8 mV (RMS)
MIN.
11
1
3.4
5.7
2.75
4.9
3.1
−
−
−
−
43.3
28.7
−3
12.7
33.5
25.5
−
−40
5.45
−
−
3.7
6.1
3.0
5.3
3.35
11
9
460
44.3
29.7
−
15.2
34.7
28
40
−
6.45
TYP.
MAX. UNIT
130
11
4.0
6.5
3.25
5.7
3.6
−
−
−
45.3
30.7
+15
17.7
35.9
30.5
−
+12
7.45
mA
mA
V
V
V
V
V
V
mA
mA
µA
dB
dB
dB
dB
dB
dB
dB
dB
dB
V
BB
−
0.25
−
G
v(TXIN-TXOUT)
voltage gain from pin TXIN to
TXOUT
G
v(HFTX-LN)
voltage gain from pin HFTX to LN
G
v(HFRX-LSAO
) voltage gain from pin HFRX
to LSAO
SWRA
∆SWRA
∆G
v(trx)
switching range
switching range adjustment
gain control range for transmit and I
line
= 70 mA
receive amplifiers affected by the
AGC; with respect to I
line
= 15 mA
1999 Oct 14
3
Philips Semiconductors
Product specification
Speech and handsfree IC
BLOCK DIAGRAM
REG
LN 18 (15)
19
(16)
STARTER
SLPE
17
(14)
TEA1098
(10) 13 VBB
R1
(19) 22 VDD
LINE CURRENT DETECTION
LOW VOLTAGE BEHAVIOUR
SWITCH
SUPPLY
MANAGEMENT
(20) 23 MICS
AGC 21 (18)
AGC
POWER-DOWN
CURRENT SOURCES
(38) 1 PD
GND 16 (13)
Tail currents for preamps
HFTX 39 (36)
TEA1098
DTMF 35 (32)
MIC+ 34 (31)
MIC− 33 (30)
ATTENUATOR
LOGIC
INPUTS
DECODING
(37) 40 HFC
(39) 2 MUTE
(27) 30 GATX
(26) 29 TXOUT
TXIN 31 (28)
(29) 32 GNDTX
(24) 27 SWT
TSEN 8 (4)
TENV 7 (3)
TNOI 6 (2)
RNOI 9 (5)
RENV 11 (7)
RSEN 10 (6)
VOLUME
CONTROL
GALS 14 (11)
LSAO 15 (12)
(23) 26 VOL
TX AND RX
ENVELOPE AND NOISE
DETECTORS
BUFFERS
AND
COMPARATORS
(21) 24 STAB
DUCO LOGIC
SWT STATUS
VOICE
SWITCH
(22) 25 SWR
(25) 28 IDT
(1) 5 HFRX
DLC 12 (8)
DYNAMIC
LIMITER
(17) 20 IR
RECO 38 (35)
GARX 37 (34)
QR 36 (33)
ATTENUATOR
MGL317
Pin numbers in parenthesis apply to the TEA1098H. Pin numbers not in parenthesis apply to the TEA1098TV.
Fig.1 Block diagram.
1999 Oct 14
4
Philips Semiconductors
Product specification
Speech and handsfree IC
PINNING
PIN
SYMBOL
TEA1098TV
PD
MUTE
n.c.
n.c.
n.c.
n.c.
n.c.
HFRX
TNOI
TENV
TSEN
RNOI
RSEN
RENV
DLC
n.c.
V
BB
GALS
LSAO
GND
SLPE
LN
REG
IR
AGC
V
DD
MICS
STAB
SWR
VOL
SWT
IDT
TXOUT
GATX
TXIN
GNDTX
MIC−
MIC+
1
2
3
4
−
−
−
5
6
7
8
9
10
11
12
−
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
TEA1098H
38
39
40
41
42
43
44
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
TEA1098UH
41
42
43
44
45
46
47
1
2
3
4
5
6
7
8
9 and 13
10
11
12
14 and 15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31 to 32
33
34
power-down input (active LOW)
logic input (active LOW)
not connected
not connected
not connected
not connected
not connected
receive input for loudspeaker amplifier
transmit noise envelope timing adjustment
PAD
DESCRIPTION
TEA1098
transmit signal envelope timing adjustment
transmit signal envelope sensitivity adjustment
receive noise envelope timing adjustment
receive signal envelope sensitivity adjustment
receive signal envelope timing adjustment
dynamic limiter capacitor for the loudspeaker amplifier
not connected
stabilized supply for internal circuitry
loudspeaker amplifier gain adjustment
loudspeaker amplifier output
ground reference
line current sense
positive line terminal
line voltage regulator decoupling
receive amplifier input
automatic gain control/line loss compensation
3.35 V regulated voltage supply for microcontrollers
microphone supply
reference current adjustment
switching range adjustment
loudspeaker volume adjustment
switch-over timing adjustment
Idle mode timing adjustment
HF microphone amplifier output
HF microphone amplifier gain adjustment
HF microphone amplifier input
ground reference for microphone amplifiers
negative HS microphone amplifier input
positive HS microphone amplifier input
1999 Oct 14
5
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