INTEGRATED CIRCUITS
DATA SHEET
TEA1098A
Speech and handsfree IC
Preliminary specification
File under Integrated Circuits, IC03
2000 Mar 21
Philips Semiconductors
Preliminary 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
•
Earphone amplifier for dynamic, magnetic or
piezo-electric earpieces (with externally adjustable gain)
•
Digital volume control on earphone amplifier (4 steps)
•
Automatic Gain Control (AGC) for true line loss
compensation
•
Microphone mute
•
Key tone mode.
Supplies
•
Provides a strong 3.35 V regulated supply for
microcontroller or dialler
•
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
•
Dynamic limiter on loudspeaker amplifier to prevent
distortion
•
Digital volume control on loudspeaker amplifier (8 steps)
ORDERING INFORMATION
PACKAGE
TYPE NUMBER
NAME
TEA1098ATV
TEA1098AH
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
GENERAL DESCRIPTION
•
Duplex controller consisting of:
TEA1098A
– 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.
The TEA1098A is an analog bipolar circuit dedicated for
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.
Digital volume control is available both on earphone and
loudspeaker amplifiers.
This IC provides a 3.35 V strong supply for a
microcontroller and a 2.0 V filtered voltage supply for an
electret microphone.
VERSION
SOT158-1
SOT307-2
2000 Mar 21
2
Philips Semiconductors
Preliminary specification
Speech and handsfree IC
TEA1098A
QUICK REFERENCE DATA
I
line
= 15 mA; R
SLPE
= 20
Ω;
Z
line
= 600
Ω;
f = 1 kHz; T
amb
= 25
°C;
AGC pin connected to LN; PD = HIGH; HFC = LOW;
MUTE = HIGH; BPC = HIGH; measured according to test circuits; unless otherwise specified.
SYMBOL
I
line
V
SLPE
V
BB
V
DD
I
BB
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
in speech mode
in handsfree mode
I
BB(PD)
G
v(MIC-LN)
G
v(IR-RECO)
∆G
v(RECO-EARO)
G
v(TXI-TXO)
G
v(HFTX-LN)
G
v(HFRX-LSAO
)
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 EARO
voltage gain from pin TXI to
TXO
voltage gain from pin HFTX
to LN
voltage gain from pin HFRX
to LSAO
switching range
switching range adjustment
gain control range for
transmit and receive
amplifiers affected by the
AGC; with respect to
I
line
= 15 mA
with R
SWR
referenced to
365 kΩ
I
line
= 70 mA
V
TXI
= 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
PD = LOW
V
MIC
= 5 mV (RMS)
V
IR
= 15 mV (RMS);
HFC = HIGH
−
−
−
43.3
28.7
−3
12.7
33.5
25.5
11
9
460
44.3
29.7
−
15.2
34.7
28
−
−
−
45.3
30.7
+15
17.7
35.9
30.5
mA
mA
µA
dB
dB
dB
dB
dB
dB
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
MIN.
11
1
3.4
5.7
2.75
4.9
3.1
−
−
−
3.7
6.1
3.0
5.3
3.35
V
BB
−
0.25
TYP.
MAX.
130
11
4.0
6.5
3.25
5.7
3.6
−
UNIT
mA
mA
V
V
V
V
V
V
SWR
∆SWR
∆G
v(trx)
−
−40
5.45
40
−
6.45
−
+12
7.45
dB
dB
dB
2000 Mar 21
3
Philips Semiconductors
Preliminary specification
Speech and handsfree IC
BLOCK DIAGRAM
TEA1098A
handbook, full pagewidth
REG
20
(16)
STARTER
SLPE
18
(14)
(10) 14 VBB
LN 19 (15)
R1
(19) 23 VDD
LINE CURRENT DETECTION
LOW VOLTAGE BEHAVIOUR
SWITCH
SUPPLY
MANAGEMENT
(20) 24 MICS
AGC 22 (18)
AGC
POWER-DOWN
CURRENT SOURCES
(38) 1 PD
GND 17 (13)
tail currents for preamps
(37) 40 HFC
HFTX 39 (36)
TEA1098A
DTMF 35 (32)
MIC+ 34 (31)
MIC− 33 (30)
ATTENUATOR
LOGIC
INPUTS
DECODING
(39) 2 MUTE
(40) 3 BPC
(27) 30 GATX
(26) 29 TXO
TXI 31 (28)
(29) 32 GNDTX
(24) 27 SWT
TSEN 9 (4)
TENV 8 (3)
TNOI 7 (2)
RNOI 10 (5)
RENV 12 (7)
RSEN 11 (6)
VOLUME
CONTROL
GALS 15 (11)
LSAO 16 (12)
(41) 4 EVCI
(42) 5 LVCI
TX AND RX
ENVELOPE AND NOISE
DETECTORS
BUFFERS
AND
COMPARATORS
(21) 25 STAB
DUCO LOGIC
SWT STATUS
VOICE
SWITCH
(22) 26 SWR
(25) 28 IDT
(1) 6 HFRX
DLC 13 (8)
DYNAMIC
LIMITER
(17) 21 IR
RECO 38 (35)
GARX 37 (34)
EARO 36 (33)
ATTENUATOR
FCA140
Fig.1 Block diagram.
2000 Mar 21
4
Philips Semiconductors
Preliminary specification
Speech and handsfree IC
PINNING
PIN
SYMBOL
TEA1098ATV
PD
MUTE
BPC
EVCI
LVCI
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
n.c.
SWT
IDT
TXO
GATX
TXI
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
TEA1098AH
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
power-down input (active LOW)
logic input (active LOW)
logic input (active LOW)
DESCRIPTION
TEA1098A
logic input for digital volume control (earpiece and loudspeaker LSB)
logic input for digital volume control (loudspeaker MSB)
not connected
not connected
receive input for loudspeaker amplifier
transmit noise envelope timing adjustment
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
not connected
switch-over timing adjustment
Idle mode timing adjustment
handsfree microphone amplifier output
handsfree microphone amplifier gain adjustment
handsfree microphone amplifier input
ground reference for microphone amplifiers
negative handset microphone amplifier input
positive handset microphone amplifier input
2000 Mar 21
5
Talking
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