TECHNICAL DATA
TELEPHONE SPEECH NETWORK
WITH DIALER INTERFACE
ILA1062/1062A
FEATURES
• Low DC line voltage; operates down to 1.6V (excluding polarity
guard)
• Voltage regulator with adjustable static resistance
• Provides a supply for external circuits
• Symmetrical high-impedance inputs (64 kΩ) for dynamic,
magnetic or piezo-electric microphones
• Asymmetrical high-impedance input (32 kΩ) for electrets
microphones
• DTMF signal input with confidence tone
• Mute input for pulse or DTMF dialing
- ILA1062: active HIGH (MUTE)
- ILA1062A: active LOW (MUTE)
• Receiving amplifier for dynamic, magnetic or piezo-electric
earpieces
• Large gain setting range on microphone and earpiece
amplifiers
• Line loss compensation (line current dependent) for
microphone and earpiece amplifiers
• Gain control curve adaptable to exchange supply
• DC line voltage adjustment facility
ILA1062N/AN Plastic
ILA1062D/AD SOIC
PIN CONNECTION
ORDERING INFORMATION
Device
ILA1062N
ILA1062AN
ILA1062D
ILA1062AD
ILA1062DT
ILA1062ADT
Operating
Temperature Range
Package
Packing
TA = -25° to 75° C
DIP8
DIP8
SOP8
SOP8
SOP8
SOP8
Tube
Tube
Tube
Tube
Tape & Reel
Tape & Reel
DESCRIPTION
The ILA1062 and ILA1062A are integrated circuits that perform all speech and line interface functions
required in fully electronic telephone sets. They perform electronic switching between dialing and speech.
The ICs operates at line voltage down to 1.6 V DC (with reduced performance) to facilitate the use of more
telephone sets connected in parallel.
All statements and values refer to all versions unless otherwise specified. The ILA1062 (ILA1062A) is
packaged in a standard 16-pin plastic DIP and special plastic DIP with internal heatsink is also available.
2011, March, ver.01
ILA1062/1062A
QUICK REFERENCE DATA
Characteristic
Symbol
Test Condition
Min
Typ
Max
Unit
Line Voltage
VLN
Iline = 15mA
3.55
4.0
4.25
V
Operating Line Current
I line
2.0
Vdc
Normal Operation
11
140
mA
with Reduced Performance
1
11
mA
1.35
mA
V
Internal Supply Current
Supply Voltage for Peripherals
I CC
VCC
Voltage Gain
VCC = 2.8V
Iline= 15mA
Ip= 1.2mA
Ip= 0mA
0.9
2.2
2.2
2.7
3.4
GV
microphone amplifier
44
52
dB
receiving amplifier
20
31
dB
Line loss compensation
Gain Control
∆GV
Exchange Supply Voltage
Vexch
36
60
V
Exchange Feeding bridge
Resistance
Rexch
0.4
1
kΩ
5.8
dB
BLOCK DIAGRAM
VCC
LN
13
IR
1
10
5
GAR
-
ILA1062A
BT1062A
4
QR
+
MIC+
7
+
2
MIC-
6
-
-
+
DTMF
11
+
dB
3
-
(1)
GAS1
GAS2
12
MUTE
SUPPLY AND
REFERENCE
CONTROL
CURRENT
LOW VOLTAGE
CIRCUIT
CURRENT
REFERENCE
9
VEE
14
REG
15
8
AGC
STAB
16
SLPE
(1) Pin 12 is active HIGH (MUTE) for ILA1062.
Fig.1 Block diagram of ILA1062A
2011, March, ver.01
ILA1062/1062A
FUNCTIONAL DESCRIPTION
Supplies VCC, LN, SLPE, REG and STAB
Power for the IC and its peripheral circuits is usually
obtained from the telephone line. The supply voltage is
delivered from the line via a dropping resistor and
regulated by the IC. The supply voltage VCC may also
be used to supply external circuits e.g. dialing and
control circuits.
Decoupling of the supply voltage is performed by a
capacitor between VCC and VEE . The internal voltage
regulator is decoupled by a capacitor between REG and
VEE.
The DC current flowing into the set is determined by
the exchange supply voltage Vexch , the feeding bridge
resistance Rexch and the DC resistance of the telephone
line Rline .
The circuit has internal current stabilizer operating at a
level determined by a 3.6 kΩ resistor connected
between STAB and VEE (see Fig.6). When the line
current (Iline) is more than 0.5mA greater than the sum
of the IC supply current (ICC) and the current drawn by
the peripheral circuitry connected to VCC (Ip) the excess
current is shunted to VEE via LN.
The regulated voltage on the line terminal (VLN) can be
calculated as:
VLN = Vref + ISLPE x R9
VLN = Vref + {(Iline - ICC - 0.5 x 10-3A) - Ip} x R9
Vref is an internally generated temperature compensated
reference voltage of 3.7V and R9 is an external resistor
connected between SLPE and VEE.
In normal use the value of R9 would be 20Ω.
Changing the value of R9 will also affect microphone
gain, DTMF gain, gain control characteristics, sidetone
level, maximum output swing on LN and the DC
characteristics (especially at the lower voltages).
Under normal conditions, when ISLPE >>ICC + 0.5mA +
Ip, the static behaviour of the circuit is that of a 3.7V
regulator diode with an internal resistance equal to that
of R9. In the audio frequency range the dynamic
impedance is largely determined by R1. Fig.2 show the
equivalent impedance of the circuit.
At line currents below 9mA the internal reference
voltage is automatically adjusted to a lower value
(typically 1.6V at 1mA). This means that more sets can
be operated in parallel with DC line voltage (excluding
the polarity guard) down to an absolute minimum
voltage of 1.6V. At line currents below 9mA the circuit
has limited sending and receiving levels. The internal
reference voltage can be adjusted by means of an
external resistor (RVA). This resistor when connected
between LN and REG will decrease the internal
reference voltage and when connected between REG
and SLPE will increase the internal reference voltage.
Microphone inputs MIC+ and MIC- and gain pins
GAS1 and GAS2
The circuit has symmetrical microphone inputs. Its
input impedance is 64 kΩ (2 x 32kΩ) and its voltage
gain is typically 52 dB (when R7 = 68kΩ; see Fig.6).
Dynamic, magnetic, piezo-electric or electret (with
built-in FET source followers) can be used.
The gain of the microphone amplifier can be adjusted
between 44 dB and 52 dB to suit the sensitivity of the
transducer in use. The gain is proportional to the value
of R7 which is connected between GAS1 and GAS2.
Stability is ensured by two external capacitors, C6
connected between GAS1 and SLPE and C8 connected
between GAS1 and VEE. The value of C6 is 100pF but
this may be increased to obtain a first-order low-pass
filter. The value of C8 is 10 times the value of C6. The
cut-off frequency corresponds to the time constant R7 x
C6.
Input MUTE (ILA1062A)
When MUTE is LOW or open-circuit, the DTMF input
is enable and the microphone and receiving amplifier
inputs are inhibited. The reverse is true when MUTE is
HIGH.
MUTE switching causes only negligible clicking on the
line and earpiece output. If the number of parallel sets
in use causes a drop in line current to below 6 mA the
DTMF amplifier becomes active independent to the DC
level applied to the MUTE input.
Fig.2 Equivalent impedance circuit
2011, March, ver.01
ILA1062/1062A
Dual-tone multi-frequency input DTMF
When the DTMF input is enable dialing tones may be
sent on to the line. The voltage gain from DTMF to LN
is typically 25.5 dB (when R7=68kΩ) and varies with
R7 in the same way as the microphone gain. The
signaling tones can be heard in the earpiece at a low
level (confidence tone).
Receiving amplifier IR, QR and GAR
The receiving amplifier has one input (IR) and a noninverting output (QR). The IR to QR gain is typically
31dB (when R4 = 100kΩ). It can be adjusted between
20 and 31dB to match the sensitivity of the transducer
in use. The gain is set with the value of R4 which is
connected between GAR and QR. The overall receive
gain, between LN and QR, is calculated by subtracting
the anti-sidetone network attenuation (32dB) from the
amplifier gain. Two external capacitors, C4 and C7,
ensure stability. C4 is normally 100pF and C7 is 10
times the value of C4. The value of C4 may be
increased to obtain a first-order low-pass filter. The
cut-off frequency will depend on the time constant R4 x
C4.
The output voltage of the receiving amplifier is
specified for continuous-wave drive. The maximum
output voltage will be higher under speech conditions
where the peak to RMS ratio is higher.
Automatic gain control input AGC
Automatic line loss compensation is achieved by
connecting a resistor (R6) between AGC and VEE.
The automatic gain control varies the gain of the
microphone amplifier and the receiving amplifier in
accordance with the DC line current. The control range
is 5.8 dB which corresponds to a line length of 5 km for
a 0.5mm diameter twisted-pair copper cable with a DC
resistance of 176 dB/km and average attenuation of
1.2dB/km. Resistor R6 should be chosen in accordance
with the exchange supply voltage and its feeding bridge
resistance. The ratio of start and stop currents of the
AGC curve is independent of the value of R6. If no
automatic line-loss compensation is required the AGC
pin may be left open-circuit. The amplifiers, in this
condition, will give their maximum specified gain.
Sidetone suppression
The anti-sidetone network, R1//Zline, R2, R3, R8, R9
and Zbal suppresses the transmitted signal in the
earpiece. Maximum compensation is obtained when the
following conditions are fulfilled:
R9 x R2 = R1 x R 3 +
Z bal
Z bal + R 8
=
R 8 x Z bal
R 8 + Z bal
Z line
(1)
(2)
Z line + R 1
If fixed values are chosen for R1, R2, R3 and R9, then
condition (1) will always be fulfilled when
To obtain optimum sidetone suppression, condition (2)
has to be fulfilled which results in:
Zbal =
R8
x Zline = k x Zline
R1
Where k is scale factor; k =
R8
R1
The scale factor k, dependent on the value of R8, is
chosen to meet the following criteria:
- compatibility with a standard capacitor from the E6 or
E12 range for Zbal
- |Zbal//R8|<<R8 fulfilling condition (a) and thus
ensuring correct
anti-sidetone bridge operation
- |Zbal + R8|>>R9 to avoid influencing the transmit gain.
In practise Zline varies considerably with the line type
and length. The value chosen for Zbal should therefore
be for an average line thus giving optimum setting for
short or long lines.
2011, March, ver.01
ILA1062/1062A
ABSOLUTE MAXIMUM RATING
Characteristic
Symbol
Positive Continuous Line Voltage
Repetitive Line Voltage During
Switch-on or Line Interruption
Repetitive Peak Line Voltage for a
1ms Pulse per 5s
Line Current
Input Voltage on all other Pins
Total Power Standard DIP
Dissipation
DIP with heatsink
Operating Ambient Temperature
Storage Temperature
Junction Temperature
VLN
VLN(R)
VLN(RM)
Iline
VI
Ptot
Test Condition
Min
Typ
R9 = 20Ω; R10 = 13Ω;
see Fig.6
R9 = 20Ω; note 1
-0.7
R9 = 20Ω; note 2
TA
Tstg
Tj
-25
-40
Max
Unit
12
13.2
V
V
28
V
140
VCC+0.7
0.58
0.67
+75
+125
+125
mA
V
W
o
C
C
o
C
o
Notes
1. Mostly dependent on the maximum required TA and on the voltage between LN and SLPE.
o
2. Calculated for the maximum ambient temperature specified and a maximum junction temperature of 125 C.
o
o
(Thermal Resistance RJA = 85 C/W for standard DIP and RJA = 75 C/W for special DIP with heatsink).
3. Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
These are stress ratings only and functional operation of the device at these or any other conditions beyond those
indicated under “recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
150
150
I LN (mA)
I LN (mA)
130
130
110
110
(1)
(1)
90
(2)
90
(2)
(3)
70
(3)
70
(4)
(4)
50
50
30
30
2
(1)
(2)
(3)
(4)
4
6
8
10
12
V LN - V SLPE (V)
TA = 45oC; Ptot = 0.94 W
TA = 55oC; Ptot = 0.82 W
TA = 65oC; Ptot = 0.71 W
TA = 75oC; Ptot = 0.58 W
Fig.3a Safe operating area
(Standard DIP)
2
(1)
(2)
(3)
(4)
4
6
8
10
12
V LN - V SLPE (V)
TA = 45oC; Ptot = 1.07 W
TA = 55oC; Ptot = 0.93 W
TA = 65oC; Ptot = 0.80 W
TA = 75oC; Ptot = 0.67 W
Fig.3b Safe operating area
(DIP with HS)
2011, March, ver.01
ILA1062/1062A
ELECTRICAL CHARACTERISTICS
Iline = 11mA to mA; VEE = 0V; f = 800Hz; TA = 25oC; unless otherwise specified.
Characteristic
Symbol
Test Condition
Voltage Drop over Circuit between LN
and VEE
VLN
MIC inputs open-circuit
Iline = 1mA
Iline = 4mA
Iline = 15mA
Iline = 100mA
Iline = 140mA
Iline = 15mA
Iline = 15mA
RVA(LN to REG) = 68k Ω
RVA(REG to SLPE) = 39kΩ
VCC = 2.8V
Iline = 15mA;
Ip = 1.2mA
Ip = 0mA
Variation with Temperature
Voltage Drop over Circuit Between LN
and VEE with External Resistor RVA
|VLN/T
VLN
Supply Current
Supply Voltage available for Peripheral
Circuitry
ICC
VCC
Min
Typ
3.55
4.9
1.6
1.9
4.0
5.7
Max
V
4.25
6.5
7.5
mV/oC
V
-0.3
3.5
4.5
0.9
2.2
Unit
1.35
mA
V
2.7
3.4
Microphone inputs MIC- and MIC+ (pins 6 and 7)
Input Impedance
Differential
Single-ended
Common mode rejection ratio
Voltage Gain MIC+ or MIC- to LN
Gain Variation with Frequency
referenced to 800Hz
Gain Variation with Temperature
referenced to 25 oC
|Zi |
between MIC- and MIC+
MIC- or MIC+ to VEE
CMRR
Gv
∆Gvf
∆GvT
Iline = 15mA; R7 = 68k Ω
f = 300 and 3400 Hz
50.5
without R6; Iline = 50mA;
TA = -25 and +75 oC
64
32
82
52.0
0.2
53.5
0.2
kΩ
kΩ
dB
dB
dB
dB
DTMF Input (Pin 11)
Input Impedance
Voltage Gain from DTMF to LN
Gain Variation with Frequency
referenced to 800Hz
Gain Variation with Temperature
referenced to 25 oC
|Zi |
Gv
∆Gvf
Iline = 15mA; R7 = 68kΩ
f = 300 and 3400 Hz
∆GvT
24.3
Iline = 50mA;
TA = -25 and +75 oC
20.7
25.5
0.2
27.0
0.2
kΩ
dB
dB
dB
Gain adjustment inputs GAS1 and GAS2 (Pins2 and 3)
Transmitting Amplifier Gain variation
by adjustment of R7 between GAS1
and GAS2
∆Gv
-8
0
dB
Sending amplifier output LN (Pin1)
Output Voltage (RMS value)
VLN(rms)
THD = 10 %
Iline = 4mA
Iline = 15mA
1.7
0.8
2.3
V
V
21
kΩ
Receiving amplifier input IR (Pin 10)
Input Impedance
|Zi |
Iline = 15mA; RL = 300Ω;
(from pin 9 to
2011, March, ver.01
ILA1062/1062A
ELECTRICAL CHARACTERISTICS (continue)
Iline = 11mA to mA; VEE = 0V; f = 800Hz; TA = 25oC; unless otherwise specified.
Characteristic
Symbol
Test Condition
Min
Typ
Max
Unit
Iline = 15mA; RL = 300Ω;
(from pin 9 to pin 4)
f = 300 and 3400 Hz
29.5
4
31
32.5
Ω
dB
Receiving amplifier output QR (Pin 4)
Output Impedance
Voltage Gain from IR to QR
|Zo |
Gv
Gain Variation with Frequency
referenced to 800Hz
Gain Variation with Temperature
referenced to 25oC
∆Gvf
Output Voltage (RMS value)
Output Voltage (RMS value)
∆GvT
Vo(rms)
Vo(rms)
without R6; Iline = 50mA;
TA = -25 and +75oC
THD = 2%; sine wave drive:
R4 = 100 KΩ;
Iline = 15 mA; Ip = 0 mA
RL = 150 Ω
RL = 450 Ω
Iline = 15mA; RL = 300Ω;
(from pin 9 to pin 4)
0.22
0.3
0.2
dB
0.2
dB
0.33
0.48
15
V
V
mV
Gain adjustment input GAR (Pin 5)
∆Gv
Iline = 15mA; RL = 300Ω;
(from pin 9 to pin 4)
-11
0
dB
HIGH Level Input Voltage
VIH
Iline = 15mA
1.5
VCC
V
LOW Level Input Voltage
VIIL
Iline = 15mA
-
0.3
V
15
uA
Receiving Amplifier Gain Variation
by adjustment of R4 between GAR
and QR
Mute input (Pin 12)
Input Current
IMUTE
8
Reduction of Gain
MIC+ or MIC- to LN
ILA1062
ILA1062A
Voltage Gain from DTMF to QR
ILA1062
ILA1062A
∆Gv
Gv
dB
70
70
MUTE = HIGH
MUTE = LOW
R4 = 100kΩ; RL = 300Ω
MUTE = HIGH
MUTE = LOW
-17
-17
5.8
23
dB
Automatic Gain Control Input AGC
(Pin 15)
Controlling the Gain from IR to QR
and the Gain from MIC+, MIC- to LN
Gain Control Range
∆Gv
Highest Line Current for Maximum
Gain
Lowest Line Current for Minimum
Gain
IlineH
R6 = 110kΩ
(between AGC and VEE)
Iline = 70mA
Iline = 15mA
IlineL
Iline = 70mA
20
61
dB
mA
65
mA
2011, March, ver.01
ILA1062/1062A
The supply possibilities can be increased by setting the voltage drop over the circuit VLN to a higher value be resistor
RVA connected between REG and SLPE.
VCC > 2.2V; Iline = 15mA at VLN = 4V; R1 = 620Ω; R9 = 20Ω
(1) Ip = 2.1mA. Curve (1) is valid when the receiving or when MUTE = HIGH(ILA1062), MUTE = LOW(ILA1062A).
(2) Ip = 1.7mA. Curve (2) is valid when MUTE = LOW(ILA1062), MUTE = HIGH(ILA1062A) and the receiving
amplifier is driven; Vo(rms) = 150mV, RL = 150Ω.
Fig.4 Typical current Ip available from VCC for peripheral circuitry.
Fig. 5 Variation of gain as a function of the line current with R6 as a parameter
TABLE 1
Values of resistor R6 for optimum line-loss compensation at various values of exchange supply voltage (Vexch) and
exchange bridge resistance (Rexch ); R9 = 20Ω.
Vexch (V)
400 Rexch (Ω)
600 Rexch (Ω)
800 Rexch (Ω)
1000 Rexch (Ω)
R6 (kΩ)
36
100
78.7
-
-
48
140
110
93.1
82
60
-
-
120
102
2011, March, ver.01
ILA1062/1062A
PINNING
Pin
Symbol
Description
1
LN
2
GAS1
Gain Adjustment; Transmitting Amplifier
3
GAS2
Gain Adjustment; Transmitting Amplifier
4
QR
5
GAR
Gain Adjustment; Receiving Amplifier
6
MIC-
Inverting Microphone Input
7
MIC+
Non-inverting Microphone Input
8
STAB
Current Stabilizer
9
VEE
Negative Line Terminal
10
IR
Receiving Amplifier Input
11
DTMF
Dual-tone Multi-Frequency Input
12
MUTE
Mute Input (see note 1)
13
VCC
Positive Supply Decoupling
14
REG
Voltage Regulator Decoupling
15
AGC
Automatic Gain Control Input
16
SLPE
Slope (DC resistance) Adjustment
Positive Line Terminal
Non-inverting Output; Receiving Amplifier
Note 1. Pin 12 is active HIGH (MUTE) for ILA1062
2011, March, ver.01
BZX79
C12
Zbal
R3
3.92kΩ
C2
R2
130kΩ
R8
390Ω
R4
C7
1 nF
100pF
C4
100 nF
C5
R9
20Ω
6
7
5
4
10
C8
1 nF
2
16
100 pF
GAS1
C6
LN
MICSLPE
MIC+
GAR
QR
IR
1
RVA (R16- 14)
R7
3
GAS2
+
different protection arr angement is required for pulse dialling or register recall.
ILA1062
) Pin 12 is active HIGH (MUTE) for BT1062.
he DC line voltage can be set to a higher value by the resistor RVA (REG to SLPE).
C3
4.7
µF
14
REG
BT1062A
620Ω
R6
15
AGC
ILA1062AN
ILA1062A
he diode bridge, the Zener and R10 limit the current into, and the voltage across, the cir cuit during line transients.
elephone
ne
BZW14
(2x)
BAS11
(2x)
R10
13Ω
R1
R5
3.6
kΩ
8
STAB
V CC
13
(1)
9
V EE
MUTE
DTMF
12
11
+
C1
100
µF
-
from dial
and
control circuits
+
ILA1062/1062A
APPLICATION INFORMATION
Fig. 6 Typical application of ILA1062A, with piezo-electric earpiece and DTMF dialing
2011, March, ver.01
ILA1062/1062A
N SUFFIX PLASTIC DIP
(MS - 001BB)
A
Dimension, mm
9
16
Symbol
MIN
MAX
A
18.67
19.69
B
6.1
7.11
B
1
8
C
F
L
C
5.33
D
0.36
0.56
F
1.14
1.78
G
2.54
H
7.62
-T- SEATING
PLANE
N
G
K
M
H
D
J
0.25 (0.010) M T
NOTES:
1. Dimensions “A”, “B” do not include mold flash or protrusions.
Maximum mold flash or protrusions 0.25 mm (0.010) per side.
J
0°
10°
K
2.92
3.81
L
7.62
8.26
M
0.2
0.36
N
0.38
D SUFFIX SOIC
(MS - 012AC)
Dimension, mm
A
16
9
H
B
1
G
P
8
R x 45
C
-TK
D
SEATING
PLANE
J
0.25 (0.010) M T C M
NOTES:
1. Dimensions A and B do not include mold flash or protrusion.
2. Maximum mold flash or protrusion 0.15 mm (0.006) per side
for A; for B ‑ 0.25 mm (0.010) per side.
F
M
Symbol
MIN
MAX
A
9.8
10
B
3.8
4
C
1.35
1.75
D
0.33
0.51
F
0.4
1.27
G
1.27
H
5.72
J
0°
8°
K
0.1
0.25
M
0.19
0.25
P
5.8
6.2
R
0.25
0.5
2011, March, ver.01