INTEGRATED CIRCUITS
DATA SHEET
TEA1097
Speech and loudspeaker amplifier
IC with auxiliary inputs/outputs and
analog multiplexer
Product specification
Supersedes data of 1998 Jun 11
File under Integrated Circuits, IC03
1999 Apr 08
Philips Semiconductors
Product specification
Speech and loudspeaker amplifier IC with
auxiliary inputs/outputs and analog multiplexer
FEATURES
Line interface
•
Low DC line voltage
•
Voltage regulator with adjustable DC voltage
•
Symmetrical high-impedance inputs (70 kΩ) for
dynamic, magnetic or electric microphones
•
Dual Tone Multi-Frequency (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
microcontroller or dialler
•
Provides filtered power supply, optimized according to
line current and compatible with external voltage or
current sources
•
Filtered 2 V power supply output for electret microphone
•
Compatible with a ringer mode
•
Power-Down (PD) logic input for power-down.
Loudspeaker amplifier
•
Single-ended rail-to-rail output
•
Externally adjustable gain
•
Dynamic limiter to prevent distortion
•
Logarithmic volume control via linear potentiometer.
Auxiliary interfaces
•
Asymmetrical high-impedance input for electret
microphone.
ORDERING INFORMATION
TYPE
NUMBER
TEA1097TV
TEA1097H
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
TEA1097
•
General purpose auxiliary output for transmit and
receive
•
Auxiliary transmit input with high signal level capability
dedicated to line transmission
•
Auxiliary receive input with high signal level capability
•
Integrated multiplexer for channels selection.
APPLICATIONS
•
Telephone answering machines
•
Telephones with digital handsfree
•
Line powered telephone sets
•
Cordless telephones
•
Fax machines.
GENERAL DESCRIPTION
The TEA1097 is an analog bipolar circuit dedicated for
telephone applications. It includes a line interface, handset
microphone and earpiece amplifiers, base microphone
and loudspeaker amplifiers, some specific auxiliary
Inputs/Outputs (I/Os) and an analog multiplexer to enable
the right transmit and/or receive channels. The multiplexer
is controlled by a logic circuitry decoding four logic inputs
provided by a microcontroller. Twelve different application
modes have been defined and can be accessed by
selecting the right logic inputs.
This IC can be supplied by the line and/or by the mains if
available (in a cordless telephone or a telephone
answering machine for example). It provides a 3.35 V
supply for a microcontroller or dialler and a 2 V filtered
voltage supply for electret microphones. The IC is
designed to facilitate the use of the loudspeaker amplifier
during ringing phase.
VERSION
SOT158-1
SOT307-2
1999 Apr 08
2
Philips Semiconductors
Product specification
Speech and loudspeaker amplifier IC with
auxiliary inputs/outputs and analog multiplexer
TEA1097
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;
AUXC = LOW; MUTT = HIGH; MUTR = HIGH; measured according to test circuits; unless otherwise specified.
SYMBOL
I
line
PARAMETER
line current operating range
CONDITIONS
normal operation
TEA1097H
TEA1097TV
V
SLPE
V
BB
V
DD
stabilized voltage between SLPE
and GND (V
ref
)
regulated supply voltage for
internal circuitry
regulated supply voltage on
pin V
DD
external voltage supply allowed on
pin ESI
external current supply allowed on
pin ESI
current available on pin V
BB
speech mode
handsfree mode;
HFC = HIGH
I
BB(pd)
G
v(MIC-LN)
G
v(IR-RECO)
∆G
v(QR)
G
v(TXIN-TXOUT)
G
v(TXAUX-LN)
G
v(HFRX-LSAO)
∆G
v(trx)
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
voltage gain from pin TXIN to
TXOUT
V
TXIN
= 3 mV (RMS);
R
GATX
= 30.1 kΩ; note 1
PD = LOW
V
MIC
= 5 mV (RMS)
V
IR
= 15 mV (RMS)
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
V
ESI(ext)
I
ESI(ext)
I
BB
11
11
3.4
5.7
2.75
4.9
3.1
−
−
−
−
−
−
43.3
28.7
−3
13.15
11.5
25.5
5.45
−
−
−
3.7
6.1
3.0
5.3
3.35
140
130
11
4.0
6.5
3.25
5.7
3.6
mA
mA
mA
V
V
V
V
V
V
V
mA
mA
mA
µA
dB
dB
dB
dB
dB
dB
dB
MIN.
TYP.
MAX.
UNIT
with reduced performance 1
V
BB
−
0.25
−
−
−
11
9.5
460
44.3
29.7
−
14.85
12.5
28
6.45
6
140
−
−
−
45.3
30.7
+15
16.55
13.5
30.5
7.45
voltage gain from pin TXAUX to LN V
TXAUX
= 0.1 V (RMS);
note 1
voltage gain from pin HFRX to
LSAO
gain control range for transmit and
receive amplifiers affected by the
AGC; with respect to I
line
= 15 mA
V
HFRX
= 20 mV (RMS);
R
GALS
= 255 kΩ; note 1
I
line
= 70 mA; on
G
v(MIC-LN)
, G
v(IR-RECO)
and G
v(IR-AUXO)
Note
1. When the channel is enabled according to Table 1.
1999 Apr 08
3
Philips Semiconductors
Product specification
Speech and loudspeaker amplifier IC with
auxiliary inputs/outputs and analog multiplexer
BLOCK DIAGRAM
handbook, full pagewidth
TEA1097
REG
LN
19 (15)
20
(16)
STARTER
SLPE
18
(14)
(10) 13
(9) 12
VBB
ESI
VDD
MICS
LINE CURRENT DETECTION
LOW VOLTAGE BEHAVIOUR
(19) 23
SWITCH
SUPPLY
D6
MANAGEMENT
(20) 24
AGC
22 (18)
AGC
POWER-DOWN
CURRENT SOURCES
(38) 40
PD
GND
17 (13)
Tail currents for preamps
TXAUX 5 (43)
(37) 39
DTMF 34 (32)
ANALOG
MULTIPLEXER
CONTROL
(39) 1
(40) 2
(41) 3
HFC
MUTT
MUTR
AUXC
ATT.
TEA1097TV
MIC+ 33 (31)
MIC− 32 (30)
TXIN 30 (28)
(27) 29
GATX
(26) 28
(29) 31
TXOUT
GNDTX
STAB
25 (21)
TAIL
CURRENTS
VOLUME
CONTROL
(23) 27
(1) 7
VOL
HFRX
GALS
LSAO
14 (11)
16 (12)
DLC
11 (8)
DYNAMIC
LIMITER
(36) 38
AUXO
6 (44)
HFTX
(17) 21
IR
RECO
GARX
QR
37 (35)
36 (34)
35 (33)
(42) 4
RAUX
ATT.
MGL392
The pin numbers given in parenthesis refer to the TEA1097H.
Fig.1 Block diagram.
1999 Apr 08
4
Philips Semiconductors
Product specification
Speech and loudspeaker amplifier IC with
auxiliary inputs/outputs and analog multiplexer
PINNING
PIN
SYMBOL
VSO40
MUTT
MUTR
AUXC
RAUX
TXAUX
AUXO
HFRX
n.c.
DLC
ESI
V
BB
GALS
LSAO
GND
SLPE
LN
REG
IR
AGC
V
DD
MICS
STAB
VOL
TXOUT
GATX
TXIN
GNDTX
MIC−
MIC+
DTMF
QR
GARX
RECO
HFTX
HFC
PD
1
2
3
4
5
6
7
8 to 10,
15 and 26
11
12
13
14
16
17
18
19
20
21
22
23
24
25
27
28
29
30
31
32
33
34
35
36
37
38
39
40
QFP44
39
40
41
42
43
44
1
2 to 7, 22,
24 and 25
8
9
10
11
12
13
14
15
16
17
18
19
20
21
23
26
27
28
29
30
31
32
33
34
35
36
37
38
logic input (active LOW)
logic input (active LOW)
logic input
auxiliary receive amplifier input
auxiliary transmit amplifier input
auxiliary amplifier output
receive input for loudspeaker amplifier
not connected
dynamic limiter capacitor for the loudspeaker amplifier
external supply input
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 microcontroller
microphone supply output
reference current adjustment
loudspeaker volume adjustment
base microphone amplifier output
base microphone amplifier gain adjustment
base microphone amplifier input
ground reference for microphone amplifiers
negative handset microphone amplifier input
positive handset microphone amplifier input
dual tone multi-frequency input
earpiece amplifier output
earpiece amplifier gain adjustment
receive amplifier output
transmit input for auxiliary receive amplifier
logic input
power-down input (active LOW)
DESCRIPTION
TEA1097
1999 Apr 08
5
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