STMICROELECTRONICS L3916A

L3916A
L3926A - L3936A
SPEECH AND 14 MEMORY DIALER WITH LED DRIVER
ADVANCE DATA
SPEECH CIRCUIT
2 TO 4 WIRES CONVERSION
PRESENT THE PROPER DC PATH FOR THE
LINE CURRENT AND THE FLEXIBILITY TO
ADJUST IT AND ALLOW PARALLEL PHONE
OPERATION
PROVIDES SUPPLY WITH LIMITED CURRENT FOR EXTERNAL CIRCUITRY
SYMMETRICAL HIGH IMPEDANCE MICROPHONE INPUTS SUITABLE FOR DYNAMIC
ELECTRET
OR
PIEZOELECTRIC
TRANSDUCER
ASYMMETRICAL
EARPHONE
OUTPUT
SUITABLE FOR DYNAMIC TRANSDUCER
LINE LOSS COMPENSATION
INTERNAL MUTING TO DISABLE SPEECH
DURING DIALING
LIGHTED DIAL LED CONSUMING 25% OF
LINE CURRENT
DIALER CIRCUIT
32 DIGITS FOR LAST NUMBER REDIAL
BUFFER
18 DIGITS FOR 13 MEMORY REDIAL
ALLOW MIXED MODE DIALING IN EITHER
TONE OR PULSE MODE
PACIFIER TONE PROVIDES AUDIBLE INDICATION OF VALID KEY PRESSED IN A
BUZZER OR/AND IN THE EARPHONE
TIMED PABX PAUSE
FLASH INITIATES TIMED BREAK:
MASK OPTIONS WITH 585ms,300ms,100ms.
CONTINUOUS TONE FOR EACH DIGIT UNTIL KEY RELEASE
USES INEXPENSIVE 3.579545MHz CERAMIC RESONATOR
POWERED FROM TELEPHONE LINE, LOW
OPERATING VOLTAGE FOR LONG LOOP
APPLICATION
DESCRIPTION
The device consists of the speech and the dialer.
It provides the DC line interface circuit that terminates the telephone line, analog amplifier for
speech transmission and necessary signals for
either DTMF or loop disconnect (pulse) dialing.
January 1995
DIP28
SO28
ORDERING NUMBERS:
L3916AN
L3916AD
L3926AN
L3926AD
L3936AN
L3936AD
PIN CONNECTION (Top view)
KEYPAD CONFIGURATION
Note: PAUSE/LND:
PAUSE and LND functions are sharing the same key with different
sequence. Hereafter, PAUSE and LND keys arereferring to the same
key.
1/15
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
L3916A - L3926A - L3936A
BLOCK DIAGRAM
DESCRIPTION (continued)
When mated with a tone ringer, a complete telephone can be produced with just two ICs.
The DC line interface circuit develops its own line
voltage across the device and it is adjustable by
external resistor to suit different country’s specification.
The speech network provides the two to four
wires interface, electronic switching between dialing and speech and automatic gain control on
transmit and receive.
The dialing network buffers up to 32 digits into the
LND memory that can be later redialed with a single key input. Additionally, another 13 memories
(including 3 emergency memories) of 18 digits
memory is available. Users can store all 13 signalling keys and access several unique functions
with single key entries. These functions include:
Pause/Last Number Dialed (LND), Softswitch,
Flash.
2/15
The FLASH key simulates a timed hook flash to
transfer calls or to activate other special features
provided by the PABX or central office.
The PAUSE key stores a timed pause in the number sequence. Redial is then delayed until an outside line can be accessed or some other activity
occurs before normal signaling resumes.
A LND key input automatically redials the last
number dialed.
FUNCTION PIN DESCRIPTION
C1, C2, C3, C4, R5, R4, R3, R2, R1
Keyboards inputs. Pins 1, 2, 3, 4, 24, 25, 26, 27,
28. The one chip phone interfaces with either the
standard 2-of-9 with negative common or the single-contact (Form A) keyboard.
L3916A - L3926A - L3936A
FUNCTION PIN DESCRIPTION (continued)
A valid keypad entry is either a single Row connected to a single Column or GND simultaneously
presented to both a single Row and a single Colunm.
In its quiescent or standby state, during normal
off-hook operation, either the Rows or the Columns are at logic level 1 (VDD). Pulling one input
low enables the on chip oscillator. Keyboard
scanning then begins.
Scanning consists of Rows and Columns alternately switching high through on chip pullups. After both a Row and Column key have been detected, the debounce counter is enabled and any
noise (bouncing contacts, etc) is ignored for a debounce period (TKD) of 32ms. At this time, the
keyboard is sampled and if both the Row and Column information are valid, the information is buffered into the LND location. After scanning starts,
the row and column inputs will assume opposite
states.
In the tone mode, if two or more keys in the same
row or if two or more keys in the same column are
depressed a single tone will be output. The tone
will corresponds to the row or column for which
the two keys were pushed. This feature is for testing purposes, and single tone will not be redialed.
Also in the tone mode, the output tone is continuous in the manual dialing as long as the key is
pushed. The output tone duration follows the Table 1. When redialing in the tone mode, each
DTMF output has 100ms duration, and the tone
separation (inter signal delay) is 100ms.
Table 1: Output Tone Duration
Key-Push Time, T
Tone Output
T<= 32ms
No output, ignored by
one chip phone.
100ms Duration
32ms < = T < = 100ms +
Tkd
T > = 100ms + Tkd
Output Duration = T - Tkd
OSC
Output. Pin 5. Only one pin is needed to connect
the ceramic resonator to the oscillator circuit. The
other end of the resonator is connected to GND
(pin 8). The nominal resonator frequency is
3.579545MHz and any deviation from this standard is directly reflected in the Tone output frequencies. The ceramic resonator provides the
time reference for all circuit functions. A ceramic
resonator with tolerance of ±0.25% is recommended
PULSE
Output. Pin 6. This is an output consisting of an
open drain N-Channel device. During on-hook,
pulse output pin is in high impedance and once offhooked,it will be pulled high by external resistor.
MODE/PACIFIER TONE
Input (MODE). Pin 7. MODE determines the dialer’s default operating mode. When the device is
powered up or the hookswitch input is switched
from on-hook (VDD) to off-hook (GND), the default
determines the signalling mode. A VDD connection defaults to tone mode operation and a GND
connection defaults to pulse mode operation.
When dialing in the pulse mode, a softswitch feature will allow a change to the tone mode whenever the * key is depressed. Subsequent * key inputs will cause the DTMF code for an * to be
dialed.. The softswitch will only switch from pulse
to tone. After returning to on-hook and back to offhook, the phone will be in pulse mode. Redial by
the LND key or the MEM key will repeat the softswitch.
Output (PACIFIER TONE). Pin 7. In pulse mode,
all valid key entries activate the pacifier tone. In
tone mode, any non DTMF entry (FLASH,
PROG, PAUSE, LND, MEM, E1, E2 and E3), activates the pacifier tone. The pacifier tone provides
audible feedback, confirming that key has been
properly entered and accepted. It is a 500Hz
square wave activated upon acceptance of valid
key input after the 32ms debounce time. The
square wave terminates after a maximum of
75ms or when the valid key is no longer present.
The pacifier tone signal is simultaneously sent to
earphone and the buzzer. The buzzer can be removed without affecting this function.
HKS
Input. Pin 8. This is the hookswitch input to the one
chip phone. This is a high impedance input and
must be switched high for on-hook operation or low
for off-hook operation. A transition on this input
causes the on chip logic to initialize, terminating
any operation in progress at the time. The signaling
mode defaults to the mode selected at pin 7. Figures 1 and 2 illustrate the timing for this pin.
GND
Pin 9 is the negative line terminal of the device.
This is the voltage reference for all specifications.
RXOUT, GRX, RXIN
RXOUT (pin 10), GRX (pin 11) and RXIN (pin 12).
The receive amplifier has one input RXIN and a
non inverting output RXOUT. Amplification from
RXIN to RXOUT is typically 31dB and it can be
adjusted between 11dB and 41dB to suit the sensitivity of the earphone used. The amplification is
proportional to the external resistor connected between GRX and RXOUT.
3/15
L3916A - L3926A - L3936A
FUNCTION PIN DESCRIPTION (continued)
IREF
Pin 13. An external resistor of 3.6kOhm connected between IREF and GND will set the internal current level. Any change of this resistor value
will influence the microphone gain, DTMF gain,
earphone gain and sidetone.
VCC
Pin 14, VCC is the positive supply of the speech
network. It is stabilized by a decoupling capacitor
between VCC and GND. The VCC supply voltage
may also be used to supply external peripheral
circuits.
LED
Pin 15. Lighted dial indicator. The LED connected
to this pin will light up when the telephone is offhook and consuming 25% of the line current.
ILINE
Pin 16. A recommended external resistor of
20ohm is connected between ILINE and GND.
Changing this resistor value will have influence on
microphone gain, DTMF gain, sidetone, maximum
output swing on LN and on the DC characteristics
(especially in the low voltage region).
LN
Pin 17. LN is the positive line terminal of the device.
REG
Pin 18. The internal voltage regulator has to be
decoupled by a capacitor from REG to GND. The
DC characteristics can be changed with an external resistor connected between LN and REG or
between REG and ILINE .
GTX, MIC–, MIC+
GTX (pin 19), MIC– (pin 20) and MIC+ (pin 21).
The one chip phone has symmetrical microphone
inputs. The amplification from microphone inputs to
LN is 51.5dB and it can be adjusted between 43.5
and 51.5dB. The amplification is proportional to external resistor connected between GTX and REG.
GDTMF
Pin 22. When the DTMF input is enabled, the microphone inputs and the receive amplifier input will
be muted and the dialing tone will be sent to the
line. The voltage amplification from GDTMF to LN
4/15
is 40dB. Final ouput level on LN can be adjusted
via the external resistor connected between
GDTMF and GND through a decoupling capacitor. A confidence tone is sent to the earphone
during tone dialing. The attenuation of the confidence tone from LN to Vear is –32dB typically.
VDD
Pin 23. VDD is the positive supply for the dialing
network and must meet the maximum and minimum voltage requirements.
DEVICE OPERATION
During on-hook all keypad inputs are high impedance internally and it requires very low current for
memory retention. At anytime, Row and Column
inputs assume opposite states at off-hook. The
circuit verifies that a valid key has been entered
by alternately scanning the Row and Column inputs. If the input is still valid following 32ms of debounce, the digit is stored into memory, and dialing begins after a pre-signal delay of
approximately 40ms (measured from the initial
key closure). Output tone duration is shown in Table 1.
The device allows manual dialing of an indefinite
number of digits, but if more than 32 digits are dialed, it will ”wrap around”. That is, the extra digits
beyond 32 will be stored at the beginning of LND
buffer, and the first 32 digits will no longer be
available for redial.
Table 2: DTMF Output Frequency
Key Input
Stadard
Frequency
Actual
% Deviation
Frequency
ROW 1
ROW 2
ROW 3
ROW 4
697
770
852
941
699.1
766.2
847.4
948.0
+0.31
–0.49
–0.54
+0.74
COL 1
COL 2
COL 3
1209
1336
1477
1215.9
1331.7
1471.9
+0.57
–0.32
–0.35
NORMAL DIALING
D1
D2
D3
....etc
Normal dialing is straighforward, all keyboard entries will be stored in the buffer and signaled in
succession.
PROGRAMMING AND REPERTORY DIALING
To program, enter the following:
PROG D1 D2 D3. . . Dn MEM (Location 0-9)
or
PROG D1 D2. . . .Dn E1-E3
During programming, dialing is inhibited.
L3916A - L3926A - L3936A
FUNCTION PIN DESCRIPTION (continued)
To dial a number from repertory memory (HKS
must be low), enter the following:
MEM (Location 0-9) or E1-E3
To save the last number dialed, enter the following:
PROG MEM (location 0-9) or E1-E3
HOOK FLASH
D1
FLASH
D2
...etc
Hook flash may be entered into the dialed sequence at any point by keying in the function key,
FLASH. Flash consists of a timed break of
585ms, 300ms or 100ms depending on the Mask
option. When a FLASH key is pressed, no further
key inputs will be accepted until the hookflash
function has been dialed. The key input following
a FLASH will be stored as the initial digit of the
new number, overwriting the number dialed before the FLASH, unless it is another FLASH.
FLASH key pressed immediately after hookswitch
or LND will not clear the LND buffer unless digits
are entered following the FLASH key.
Example:
FLASH
LND not cleared
LND
FLASH
LND not cleared
LND
FLASH
D1
D2
LND buffer will contain D1, D2
PAUSE/LAST NUMBER DIALED
If the PAUSE/LND key is pressed right after off
hook or FLASH key, it is considered as LND, if it
is pressed after a digit, it will be considered as
PAUSE.
LAST NUMBERED DIALED
OFF-HOOK PAUSE/LND or FLASH PAUSE/LND
Last number dialing is accomplished by entering
the PAUSE/LND key.
PAUSE
OFF-HOOK D1 PAUSE/LND D2
...etc
A pause may be entered into the dialed sequence
at any point by keying in the special function key,
PAUSE/LND. Pause inserts a 3.1 second delay
into the dialing sequence. The total delay, including pre-digit and post-digit pauses is shown in Table 3.
Table 3: Special Function Delays
Each delay shown below represents the time required after the special function key is depressed
until a new digit is dialed. The time is considered
”FIRST” key if all previous inputs have been completely dialed. The time is considered ”AUTO” if in
redial, or if previous dialling is still in progress.
Delay (seconds)
Function
First/Auto
SOFTSWITC H
FIRST
AUTO
0.2
1.0
PAUSE
FIRST
AUTO
2.6
3.4
Pulse
Tone
3.0
3.1
SOFTSWITCH FUNCTION USING TONE/PULSE
MODE SWITCH
When dialing in Pulse mode after off-hook,
switching TONE/PULSE mode switch from Pulse
to Tone will cause the device to change the signaling mode into tone signal and store the softswitch function in the LND memory for redial. To
redial the softswitch function (mixed mode dialing)
in the pulse mode after going on-hook and back
to off-hook, you have to switch the TONE/PULSE
mode switch back to pulse mode either before going on-hook or after off-hook or during on-hook.
Subsequentmode change from Tone to Pulse will
change the signaling mode to pulse dialing sequence but this mode change will not be stored in
.the LND memory.
When dialing in Tone mode after off-hook, a
switching of TONE/PULSE mode Switch from
Tone to Pulse will cause the device to change the
signaling mode into pulse mode but this mode
change will not be stored in the LND memory.
When LND key is pressed in Tone mode after going off-hook, the device will output all tone signals.
A pacifier tone of 75ms is provided after 32ms debounce time when switching from Pulse to Tone
mode.
Redial by the LND key will repeat the mixed dialing sequence in Pulse mode.
5/15
L3916A - L3926A - L3936A
Figure 1: Tone Mode Timing
Figure 2: Pulse Mode Timing
6/15
L3916A - L3926A - L3936A
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
VLN
Positive Line Voltage Continuous
12
V
ILN
Line Current
140
mA
VDD
Logic Voltage
7.0
V
VI
Maximum Voltage on Any Pin
GND(-0.3) VDD(+0.3)
V
Tamb
Operating Temperature Range
-25 to +75
°C
Tstg
Storage Temperature
-40 to 125
°C
Ptot
Total Power Dissipation
700
mW
ELECTRICAL CHARACTERISTICS (IL = 10 to 120mA; VDD = 3V; f = 1KHz; Tamb = 25°C, unless otherwise specified)
Symbol
VLN
Parameter
Line Voltage
Test Condition
IL = 4mA
IL = 15mA
IL = 120mA
RA = 68KΩ IL = 15mA
RB = 39KΩ IL = 15mA
Min.
3.15
Typ.
Max.
Unit
Fig.
V
V
V
V
V
3
3.50
2.50
3.85
7.0
6.00
6.00
V
V
3
3.2
4.1
VDD
Logic Voltage)
TONE MODE
PULSE MODE
IDD
Supply Current Into VDD
TONE MODE
PULSE MODE
600
400
µA
µA
3
2.50
2.20
ICC
Supply Current Into VCC
IL = 15mA
1.30
mA
3
ILED
Supply Current to LED
IL = 15mA
IL = 120mA
4
30
mA
mA
3
VMR
Memory Retention Voltage
IMR
Memory Retention Current
1.50
1.00
V
4
µA
4
IS
Off-Hook Stand-by Current
VDD = 4.0V
µA
3
IPL
Pulse Output Sink Current
VO = 0.5V
1.00
3.00
mA
3
IPO
Pacifier Tone Sink/Source
Current
VO = 0.5V (Sink)
VO = 2.5V (Source)
1
0.6
3
1.0
mA
mA
3
VIL
HKS, Mode, Keyboard Inputs
Low
V
-
VIH
HKS, Mode, Keyboard Inputs
High
V
-
GTX
Transmit Gain
AGTX
Transmit Gain Variation with
R GTX
150
250
0.3xVDD
0.7xVDD
Vmic = 2mVrms
IL = 15mA RGTX = 68KΩ
IL = 60mA; RGTX = 68KΩ
IL = 15mA
Vmic = 2mVrms
RGTX = 43KΩ
RGTX = 27KΩ
DTX
Transmit Distortion
IL = 15mA VLN = 1Vrms
NTX
Transmit Noise
IL = 15mA; Vmic = 0V
ZMIC
Microphone Input Impedance
6
50.0
44.5
51.5
46.5
–8
53.0
48.5
dB
dB
0
dB
–4
–8
6
dB
dB
%
6
–72
2
dBmp
6
65
KΩ
7/15
L3916A - L3926A - L3936A
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
GDTMF
DTMF Gain
CDTMF
Confidence Tone Level
Vear/VLN
VDTMF
DTMF Level on the line
High Frequency Group
Low Frequency Group
Test Condition
IL = 15mA, RDTMF = 2.25KΩ
RDTMF = 2.25KΩ,
CDTMF = 22nF
Min.
Typ.
Max.
Unit
Fig.
38
40
42
dB
7
–34
–32
–30
dB
7
–8
–10
–6
–8
–4
–6
dBm
dBm
7
1.0
2
3
dB
7
8
%
7
PEI
Pre-emphasis
DIS
DTMF Output Distortion
5
DTMF Att. pin Impedance
32
ZDTMF
GRX
AGRX
D RX
Receive Gain
Receive Gain Variation
Reveive Distortion
N RX
Receive Noise
ZOUT
VPT
Vinp = 5mVrms, Re = 300Ω
RGRX = 100KΩ
IL = 15mA
IL = 60mA
IL =15mA, Re = 300Ω
RGRX = 10KΩ
RGRX = 300KΩ
KΩ
8
29.5
24
31.0
26
–20
32.5
28
dB
dB
+10
dB
dB
dB
2
2
2
%
%
%
–20
+10
8
8
IL = 15mA; RGRX = 100KΩ
Re = 150Ω, VC = 0.25Vrms
Re = 300Ω, VC = 0.45Vrms
Re = 450Ω, VC = 0.55Vrms
µV
IL = 15mA RL = 300Ω
RGRX = 100KΩ Vinp = 0V
200
Receive Output Impedance
IL = 15mA
35
Ω
8
Pacifier Tone Level on
Earphone
IL= 15mA; Rp = ∞
Rp = 430K
60
600
mVrms
mVrms
8
32
250
100
500
ms
Hz
KΩ
Ω
75
500
10
60
40
820
50
ms
Hz
PPS
ms
ms
ms
ms
8
KEYBOARD INTERFACE
TKD
FKS
KRU
KRD
Keypad
Keypad
Keypad
Keypad
Debounce Time
Scan Frequency
Pullup Resistance
Pulldown Resistance
PULSE MODE
TPT
FPT
PR
TB
TM
IDP
PDP
Pacifier Tone Duration
Pacifier Tone Frequency
Pulse Rate
Break Time
Make Time
Inter Digit Pause
Predigit Pause
TONE MODE
TRIS
TR
TPSD
TISD
TDUR
tHFP
5
Tone Output Rise Time
Tone Signalling Rate
Pre Signal Delay
Inter Signal Delay
Tone Output Duration
Hook Flash Timing
100
100
ms
1/s
ms
ms
ms
585
300
100
ms
ms
ms
5
40
L3916A
L3926A
L3936A
Notes:
1. All inputs unloaded. Quiescent mode (oscillator off).
2. Pulse output sink current for VOUT = 0.5V.
3. Pacifier tone sink current for VOUT = 0.5V. Source current for VOUT = 2.5V.
4. Memory retention voltage is the point where memory is guaranteed but circuit operation is not. Proper memory retention is guaranteed if
either the minimum IMR is provided or the minimum VMR. The design does not have to provide both the minimum current and voltage
simultaneously.
8/15
L3916A - L3926A - L3936A
TEST CIRCUITS
Figure 3.
470nF
2.25K
GDTMF
22
4
3
IDD
22nF
RDTMF
VDD
470K
23
PULSE
3.58MHz
SW2
PULSE
TONE
2
VDD
/PT
RGRX
10µF
24
21
9
RXOUT
Re
25
8
GND
100K
26
7
HKS
300Ω
27
5
MODE
SW1
28
6
OSC
100K
1
20
11
19
13
18
VCC
RGIN
V1
620Ω
17
14
15
12
16
100nF
V1
VCC
C2
C1
R1
1
2
3 FLASH
R2
4
5
6 PROG
R3
7
8
9 P/LND
R4
*
0
#
E1 E2 E3 MEM
R5
MIC+
1µF
MIC1µF
GTX
4.7µF
RGTX 68K
IREF
3.6K
100µF
ICC =
C3
2.2K
10
GRX
C4
VLN
RA
REG
LN
RB
LED
130K
100µF
ILED
390Ω
ILINE
IL
3.9K
20Ω
600Ω
390Ω
ICC
D95TL162
Figure 4.
470nF
2.25K
GDTMF
22
4
3
VMR
IMR
22nF
VDD
470K
PULSE
3.58MHz
PULSE
TONE
SW2
OSC
MODE
100K
/PT
HKS
SW1
GND
RXOUT
300Ω
Re
GRX
10µF
2
23
6
5
7
8
10
11
100µF
RGIN
620Ω
100nF
27
26
25
24
21
C3
C2
C1
R1
1
2
3 FLASH
R2
4
5
6 PROG
R3
7
8
9 P/LND
R4
*
0
#
R5
E1 E2 E3 MEM
MIC+
2.2K
20
19
1µF
MIC1µF
GTX
4.7µF
RGTX
13
3.6K
VCC
28
9
RGRX
IREF
1
C4
14
12
18
17
15
16
REG
LN
130K
LED
ILED
ILINE
20Ω
390Ω
3.9K
390Ω
D95TL163
9/15
L3916A - L3926A - L3936A
TEST CIRCUITS(continued)
Figure 5.
470nF
2.25K
GDTMF
22
C4
4
22nF
VDD
470K
PULSE
3.58MHz
SW2
PULSE
TONE
OSC
MODE
/PT
100K
HKS
SW1
GND
RXOUT
300Ω
Re
GRX
28
27
5
26
25
7
IREF
100µF
RGIN
620Ω
2
3 FLASH
4
5
6 PROG
R3
7
8
9 P/LND
R4
*
0
#
E1 E2 E3 MEM
Imic
9
1.2V
10
MIC-
20
11
4.7µF
GTX
19
RGTX
13
REG
18
3.6K
VCC
1
R2
MIC+
21
RGRX
10µF
R1
R5
24
8
Imic
C1
1
6
1.2V
C2
2
23
ZMIC =
C3
3
LN
17
14
12
130K
LED
15
ILED
16
390Ω
ILINE
100nF
20Ω
3.9K
390Ω
D95TL164
Figure 6.
470nF
2.25K
GDTMF
22
4
3
IDD
22nF
VDD
VDD
470K
PULSE
3.58MHz
PULSE
TONE
SW2
OSC
MODE
100K
/PT
HKS
SW1
GND
RXOUT
100K
Re
10µF
GRX
2
23
6
5
7
8
10
11
100µF
RGIN
620Ω
100nF
26
25
24
21
GTX=20log
C3
C1
R1
1
2
3 FLASH
R2
4
5
6 PROG
R3
7
8
9 P/LND
R4
*
0
#
R5
E1 E2 E3 MEM
MIC+
2.2K
20
19
14
12
18
17
15
16
VLN
Vrms
NTX measured with Vrms=0
C2
1µF
Vrms
MIC1µF
GTX
RGTX 88K
13
3.6K
VCC
27
9
RGRX
IREF
1
28
C4
REG
4.7µF
VLN
LN
130K
LED
100µF
ILED
ILINE
20Ω
390Ω
IL
3.9K
390Ω
600Ω
D95TL165
10/15
L3916A - L3926A - L3936A
TEST CIRCUITS(continued)
Figure 7.
470nF
2.25K
GDTMF
22
4
3
VMF
22nF
IDD
RDTMF
4.0V
VDD
470K
SW2
OSC
100K
Re
25
24
21
8
20
10
GRX
11
19
C2
Vear
18
3.6K
17
VCC
100µF
14
RGIN
620Ω
15
12
16
Vear
CDTMF=20log
R1
1
2
3 FLASH
R2
4
5
6 PROG
R3
7
8
9 P/LND
*
0
#
R4
VLN
E1 E2 E3 MEM
R5
MIC+
1µF
MIC1µF
GTX
RGTX 88K
13
VMF
C1
RGRX
IREF
VLN
GDTMF=20log
C3
2.2K
9
RXOUT
300Ω
26
7
/PT
GND
10µF
27
5
HKS
SW1
28
6
MODE
100K
1
23
PULSE
3.58MHz
PULSE
TONE
2
C4
REG
4.7µF
VLN
LN
130K
LED
100µF
ILED
390Ω
ILINE
100nF
20Ω
IL
3.9K
390Ω
600Ω
D95TL166
Figure 8.
470nF
2.25K
GDTMF
22
4
3
IDD
22nF
4.0V
470K
23
PULSE
3.58MHz
PULSE
TONE
2
VDD
SW2
6
OSC
5
MODE
100K
7
/PT
HKS
SW1
8
GND
27
26
25
24
21
10
GRX
11
19
Vear
13
3.6K
VCC
100µF
14
RGIN
620Ω
12
18
17
15
16
Vear
Vinp
NRX with Vin=0
C2
C1
R1
1
2
3 FLASH
R2
4
5
6 PROG
R3
7
8
9 P/LND
R4
*
0
#
R5
E1 E2 E3 MEM
MIC+
1µF
MIC1µF
GTX
RGTX
RGRX
IREF
GRX=20log
C3
2.2K
20
RXOUT
Re
28
9
RP
10µF
1
C4
REG
4.7µF
VLN
LN
130K
LED
100µF
ILED
ILINE
390Ω
IL
3.9K
Vinp
100nF
20Ω
390Ω
D95TL167
11/15
L3916A - L3926A - L3936A
Figure 9:Typical Application Circuit.
10 R1
TIP
1N4004 x 4
D1
D4
D2
D3
D14
TPA270
RING
SW1A
HP5A94 Q1
100K
10M
R6
220µF
16V
C1
10V
D15
R3
3.3K
R4
150K
10K
R2
R5
HF393
Q3
1.2K
R7
1N4140
PULSE
4.7K RMF GDTMF
23
6
22
2
1
28
OSC
27
5
26
CERAMIC RESONATOR
25
BUZZER
24
MODE
SW2
100K R8
/PT
HKS
SW1B
GND
RXOUT
HOOK
100K RGRX
GRX
3.6K R9
IREF
VCC
100µF C5
RGIN
1K
RAC
D95TL168
12/15
4
3
4.7nF CMF
3.579MHz x1
10µF/50V
C3
22µF/16V
C23
VDD
5.6V
D10
0.47µF
25V
C10
4.7nF
C6
7
21
8
20
9
10
19
11
18
13
17
14
12
16
C3
1.2K
R14
C2
C1
R1
1
2
3 FLASH
R2
4
5
6 PROG
R3
7
8
9 P/LND
R4
*
0
#
R5
E1 E2 E3 MEM
MIC+
MIC-
GTX
REG
1.2K
R15
4.7µF/25V
56K
RGTX
C7
LN
ILINE
390Ω R11
3.9K R12
120Ω
RS1
15
LED
100nF
C4
C4
D12
LED
20Ω
R10
470Ω
RS2
220nF
CS
130K R13
L3916A - L3926A - L3936A
SO28 PACKAGE MECHANICAL DATA
mm
DIM.
MIN.
TYP.
A
inch
MAX.
MIN.
TYP.
2.65
MAX.
0.104
a1
0.1
0.3
0.004
0.012
b
0.35
0.49
0.014
0.019
b1
0.23
0.32
0.009
0.013
C
0.5
0.020
c1
45° (typ.)
D
17.7
18.1
0.697
0.713
E
10
10.65
0.394
0.419
e
1.27
0.050
e3
16.51
0.65
F
7.4
7.6
0.291
0.299
L
0.4
1.27
0.016
0.050
S
8° (max.)
0016572
13/15
L3916A - L3926A - L3936A
DIP28 PACKAGE MECHANICAL DATA
mm
DIM.
MIN.
TYP.
inch
MAX.
MIN.
TYP.
a1
0.63
0.025
b
0.45
0.018
b1
0.23
b2
0.31
1.27
D
E
0.009
0.012
0.050
37.34
15.2
16.68
1.470
0.598
0.657
e
2.54
0.100
e3
33.02
1.300
F
MAX.
14.1
0.555
I
4.445
0.175
L
3.3
0.130
0016130
14/15
L3916A - L3926A - L3936A
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics.
 1995 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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15/15