L3934AD [STMICROELECTRONICS]
SPEECH AND 14 MEMORY DIALER WITH HOLD FUNCTION; 言14内存锁定功能拨号器
| 型号： | L3934AD |
| 厂家： | 
ST |
| 描述： | SPEECH AND 14 MEMORY DIALER WITH HOLD FUNCTION |
| 文件： | 总15页 (文件大小：189K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
L3914A
L3924A - L3934A
SPEECH AND 14 MEMORY DIALER WITH HOLD FUNCTION
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 CUR-
RENT FOR EXTERNAL CIRCUITRY
SYMMETRICAL HIGH IMPEDANCE MICRO-
PHONE INPUTS SUITABLE FOR DYNAMIC
DIP28
SO28
ORDERING NUMBERS:
L3914AN
L3924AN
L3934AN
L3914AD
L3924AD
L3934AD
ELECTRET
OR
PIEZOELECTRIC
TRANSDUCER
ASYMMETRICAL
SUITABLE FOR DYNAMIC TRANSDUCER
LINE LOSS COMPENSATION
EARPHONE OUTPUT
PIN CONNECTION (Topview)
INTERNAL MUTING TO DISABLE SPEECH
DURING DIALING
HOLD FUNCTION FOR PARALLEL PHONE
WITH 400ms DELAY TO PREVENT FALSE
RELEASE
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 INDI-
CATION OF VALID KEY PRESSED IN A
BUZZER OR/AND IN THE EARPHONE
TIMED PABX PAUSE
KEYPAD CONFIGURATION
FLASH INITIATES TIMED BREAK:
MASK OPTIONS WITH 585ms,300ms,100ms
CONTINUOUS TONE FOR EACH DIGIT UN-
TIL KEY RELEASE
USES INEXPENSIVE 3.579545MHz CE-
RAMIC 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 termi-
nates the telephone line, analog amplifier for
speech transmission and necessary signals for
either DTMF or loop disconnect (pulse) dialing.
Note: PAUSE/LND:
PAUSE and LND functions are sharing the same key with different
sequence. Hereafter, PAUSEand LND keys arereferring tothesame
key.
January 1995
1/15
This isadvanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
L3914A - L3924A - L3934A
BLOCK DIAGRAM
transfer calls or to activate other special features
provided by the PABX or centraloffice.
When mated with a tone ringer, a complete tele-
phone can be produced with just two ICs.
The PAUSE key stores a timedpause in the num-
ber sequence.Redial is then delayed until an out-
side line can be accessed or some other activity
occursbefore normal signaling resumes.
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 specifi-
cation.
A LND key input automatically redials the last
number dialed.
The speech network provides the two to four
wires interface, electronic switching between dial-
ing 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 sin-
gle key input. Additionally, another 13 memories
(including 3 emergency memories) of 18 digits
memory is available. Users can store all 13 sig-
nalling keys and access several unique functions
with single key entries. These functions include:
Pause/Last Number Dialed (LND), Softswitch,
Flash and Hold.
The HOLD key allows the user to suspend the
conversation and resume the call on either the
same phone by pressing the HOLD key again or
resume the conversationat a parallel phone.
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 sin-
gle-contact (Form A) keyboard.
The FLASH key simulates a timed hook flash to
2/15
L3914A - L3924A - L3934A
is pressed, in this way the phone will stay con-
nected to the line untill the parallel phone is
hooked-OFFor the Hold Key is pressed again.
FUNCTION PIN DESCRIPTION (continued)
A valid keypad entry is either a single Row con-
nected to a single Column or GND simultaneously
presented to both a single Row and a single Col-
unm.
In its quiescent or standby state, during normal
off-hook operation, either the Rows or the Col-
umns are at logic level 1 (VDD). Pulling one input
low enables the on chip oscillator. Keyboard
scanningthen begins.
MODE/PACIFIER TONE
Input (MODE). Pin 7. MODE determines the di-
aler’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 connec-
tion defaults to tone mode operation and a GND
connectiondefaults to pulse mode operation.
When dialing in the pulse mode, a softswitch fea-
turewill 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 off-hook, the
phonewill 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, HOLD, 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 re-
moved without affecting this function.
Scanning consists of Rows and Columns alter-
nately switching high through on chip pullups. Af-
ter both a Row and Column key have been de-
tected, the debounce counter is enabled and any
noise (bouncing contacts, etc) is ignored for a de-
bounce period (TKD) of 32ms. At this time, the
keyboard is sampled and if both the Row and Col-
umn information are valid, the information is buff-
ered 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 keyswere pushed. This feature is for test-
ing purposes, and single tone will not be redialed.
Also in the tone mode, the output tone is continu-
ous in the manual dialing as long as the key is
pushed. The output tone duration follows the Ta-
ble 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
HKS
Key-Push Time, T
T<= 32ms
Tone Output
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 operationor low
for off-hook operation. A transition on this input
causes the on chip logic to initialize, terminating
any operationin progress at the time. The signaling
mode defaults to the mode selected at pin 7. Fig-
ures 1 and 2 illustrate the timing for this pin.
No output, ignored by
one chip phone.
32ms < = T < = 100ms +
Tkd
T > = 100ms + Tkd
100ms Duration
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
3.579545MHzand 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 resonatorwith tol-
eranceof ±0.25%is recommended.
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 sen-
sitivity of the earphone used. The amplification is
proportionalto the external resistor connected be-
tween GRX and RXOUT.
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
off-hooked, it will be pulled high by external resis-
tor. The pulse out will go high when the Hold key
3/15
L3914A - L3924A - L3934A
is 40dB. Final output level on LN can be adjusted
via the external resistor connected between
GDTMF and GND through a decoupling capaci-
tor. A confidence tone is sent to the earphone
during tone dialing. The attenuation of the confi-
dence tone from LN to Vear is –32dB typically.
FUNCTION PIN DESCRIPTION (continued)
IREF
Pin 13. An external resistor of 3.6kOhm con-
nected between IREF and GND will set the inter-
nal current level. Any change of this resistor value
will influence the microphone gain, DTMF gain,
earphone gain and sidetone.
VDD
Pin 23. VDD is the positive supply for the dialing
network and must meet the maximum and mini-
mum voltage requirements.
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.
DEVICE OPERATION
During on-hook all keypad inputs are high imped-
ance internally and it requiresvery 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 in-
puts. If the input is still valid following 32ms of de-
bounce, the digit is stored into memory, and dial-
LED
Pin 15. The LED connected to this pin will start to
blink when the HOLD key is pressed and will turn
off if the HOLD key is pressed again. Otherwise, it
will continue to blink at 1Hz frequency when the
phone is on-hooked and then turn off when the
parallel phone goes off-hook.
ing begins after
a
pre-signal delay of
approximately 40ms (measured from the initial
key closure). Output tone duration is shown in Ta-
ble 1.
The device allows manual dialing of an indefinite
number of digits, but if more than 32 digits are di-
aled, 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.
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).
Table 2: DTMF Output Frequency
LN
Stadard
Frequency Frequency
Actual
Key Input
% Deviation
Pin 17. LN is the positive line terminal of the device.
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
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
COL 1
COL 2
COL 3
1209
1336
1477
1215.9
1331.7
1471.9
+0.57
–0.32
–0.35
or between REG and ILINE
.
NORMAL DIALING
D1 D2
GTX, MIC–, MIC+
D3
....etc
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 ex-
ternalresistor connectedbetween GTX and REG.
Normal dialing is straighforward, all keyboard en-
tries will be stored in the buffer and signaled in
succession.
PROGRAMMING AND REPORTORY DIALING
To program, enter the following:
GDTMF
PROG
D1
D2
Dn MEM (location0-9)
Pin 22. When the DTMF input is enabled, the mi-
crophone 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
or
PROG
D1
D2
Dn E1-E3
During programming, dialing is inhibited.
4/15
L3914A - L3924A - L3934A
Table 3: Special FunctionDelays
FUNCTION PIN DESCRIPTION (continued)
Each delay shown below represents the time re-
quired 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 com-
pletely dialed. The time is considered ”AUTO” if in
redial, or if previous dialling is still in progress.
To dial a number from repertory memory (HKS
must be low), enter the following:
MEM (Location0-9) or E1-E3
To save the last number dialed, enter the follow-
ing:
PROG MEM (location 0-9) or E1-E3
Delay (seconds)
Function
First/Auto
Pulse
Tone
SOFTSWITCH
FIRST
AUTO
0.2
1.0
HOOK FLASH
D1
FLASH
D2
...etc
PAUSE
FIRST
AUTO
2.6
3.4
3.0
3.1
Hook flash may be entered into the dialed se-
quence 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 be-
fore the FLASH, unless it is another FLASH.
HOLD
When HOLD key is pressed during off hook, there
are two options. The first option is to mute the
phone (LED will blink) and the conversation can
be resumed by pressing the HOLD key again.
The second option is to mute the phone (LED will
blink), on-hook the phone (LED will still blink at
1Hz frequency) and automatic switch off the
phone when parallel phone is off-hook.
FLASH key pressed immediately after hookswitch
or LND will not clear the LND buffer unless digits
are entered following the FLASH key.
The HOLD function is disabled when the line cur-
rent drops below 20mA.
Example:
FLASH
LND not cleared
SOFTSWITCH FUNCTION USING TONE/PULSE
MODE SWITCH
LND
FLASH
When dialing in Pulse mode after off-hook, switch-
ing TONE/PULSE mode switch from Pulse to Tone
will causethe 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 af-
ter going on-hook and back to off-hook, you have
to switch the TONE/PULSE mode switch back to
pulsemode either beforegoing on-hookor after off-
hook or during on-hook.
Subsequentmode change from Tone to Pulse will
change the signaling mode to pulse dialing se-
quence but this mode change will not be stored in
.the LND memory.
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
When dialing in Tone mode afteroff-hook, a switch-
ing 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 outputall tone signals.
A pacifier tone of 75ms is provided after 32ms
debounce time when switching from Pulse to
Tone mode.
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 3.1second delay into
the dialing sequence.The total delay, including pre-
digit and post-digit pausesis shown in Table 3.
Redial by the LND key will repeat the mixed dial-
ing sequencein Pulse mode.
5/15
L3914A - L3924A - L3934A
Figure 1: Tone Mode Timing
Figure 2: Pulse Mode Timing
6/15
L3914A - L3924A - L3934A
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Positive Line Voltage Continuous
Value
Unit
V
VLN
ILN
12
Line Current
140
7.0
mA
V
VDD
VI
Logic Voltage
Maximum Voltage on Any Pin
Operating Temperature Range
Storage Temperature
Total Power Dissipation
GND(-0.3) VDD(+0.3)
-25 to +75
-40 to 125
700
V
Tamb
Tstg
Ptot
°C
°C
mW
ELECTRICAL CHARACTERISTICS (IL = 10 to 120mA; VDD = 3V; f = 1KHz; Tamb = 25°C, unless other-
wise specified)
Symbol
Parameter
Line Voltage
Test Condition
IL = 4mA
IL = 15mA
IL = 120mA
RA = 68KΩ ; IL = 15mA
RB = 39KΩ ; IL = 15mA
Min.
Typ.
Max.
Unit Fig.
VLN
2.50
3.85
7.0
V
V
V
V
V
3
3.15
3.50
3.2
4.1
VDD
IDD
Logic Voltage)
TONE MODE
PULSE MODE
2.50
2.20
6.00
6.00
V
V
3
3
Supply Current Into VDD
TONE MODE
PULSE MODE
600
400
µA
µA
ICC
Supply Current Into VCC
IL = 15mA
1.30
mA
3
3
ILED
Supply Current to HOLD LED IL = 15mA
IL = 120mA
4
30
mA
mA
VMR
IMR
IS
Memory Retention Voltage
Memory Retention Current
1.50
1.00
V
4
4
3
3
3
1.00
250
µA
µA
mA
Off-Hook Stand-by Current
Pulse Output Sink Current
VDD = 4.0V
VO = 0.5V
150
IPL
3.00
IPO
Pacifier Tone Sink/Source
Current
VO = 0.5V (Sink)
VO = 2.5V (Source)
1
0.6
3
1
mA
mA
VIL
VIH
GTX
HKS, Mode, Keyboard Inputs
Low
0.3xVDD
V
-
-
HKS, Mode, Keyboard Inputs
High
0.7xVDD
V
Transmit Gain
Vmic = 2mVrms
IL = 15mA; RGTX = 68KΩ
IL = 60mA; RGTX = 68KΩ
6
50.0
44.5
51.5
46.5
53.0
48.5
dB
dB
AGTX
Transmit Gain Variation with
RGTX
IL = 15mA
–8
0
dB
6
V
mic = 2mVrms
R
R
GTX = 43KΩ
GTX = 27KΩ
– 4
– 8
dB
dB
DTX
NTX
Transmit Distortion
IL = 15mA; VLN = 1Vrms
IL = 15mA; Vmic = 0V
2
%
dBmp
KΩ
6
6
5
7
7
Transmit Noise
–72
64
ZMIC
Microphone Input Impedance
DTMF Gain (Output @ LN)
Confidence Tone Level
GDTMF
CDTMF
IL = 15mA ; RDTMF = 2.25KΩ
38
40
42
dB
–34
–32
–30
dB
V
ear/VLN
7/15
L3914A - L3924A - L3934A
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Condition
DTMF = 2.25KΩ,
DTMF = 22nF
Min.
Typ.
Max.
Unit Fig.
VDTMF
DTMF Level on the line
High Frequency Group
Low Frequency Group
R
C
–8
–10
–6
–8
–4
–6
dBm
dBm
7
PEI
DIS
Pre-emphasis
1.0
2
5
3.0
8
dB
%
7
7
DTMF Output Distortion
DTMF Att. pin Impedance
Receive Gain
ZDTMF
GRX
32
KΩ
Vinp = 5mVrms; Re = 300Ω
GRX = 100KΩ
8
R
IL = 15mA
IL = 60mA
29.5
24
31.0
26
32.5
28
dB
dB
AGRX
Receive Gain Variation
IL =15mA; Re = 300Ω
–20
+10
dB
dB
dB
8
8
R
GRX = 10KΩ
–20
+10
RGRX = 300KΩ
DRX
Reveive Output Distortion
IL = 15mA; RGRX = 100KΩ
Re = 150Ω; VC = 0.25Vrms
Re = 300Ω; VC = 0.45Vrms
Re = 450Ω; VC = 0.55Vrms
2
2
2
%
%
%
NRX
Receive Noise
IL = 15mA; RL = 300Ω;
200
35
8
µV
RGRX = 100KΩ; VINP = 0V
ZOUT
VPT
Receive Output Impedance
IL = 15mA
Ω
8
8
Pacifier Tone Level on
Earphone
IL= 15mA; Rp = ∞
60
600
mVrms
mVrms
Rp = 430K
KEYBOARD INTERFACE
TKD
FKS
KRU
KRD
Keypad Debounce Time
32
ms
Hz
KΩ
Ω
Keypad Scan Frequency
Keypad Pullup Resistance
Keypad Pulldown Resistance
250
100
500
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
75
500
10
60
40
820
50
ms
Hz
PPS
ms
ms
ms
ms
TONE MODE
TRIS
TR
TPSD
TISD
TDUR
Tone Output Rise Time
Tone Signalling Rate
Pre Signal Delay
Inter Signal Delay
Tone Output Duration
5
ms
1/s
ms
ms
ms
5
40
100
100
THD
Hold Mode Delay
Hook Flash Timing
400
ms
tHFP
L3914A
L3924A
L3934A
585
300
100
ms
ms
ms
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 currentand voltage
simultaneously.
8/15
L3914A - L3924A - L3934A
TEST CIRCUITS
Figure 3.
470nF
2.25K
22nF
GDTMF
C4
C3
C2
C1
R1
R2
R3
R4
R5
22
4
3
V1
ICC =
VCC
IDD
2
RDTMF
VDD
23
6
1
1
4
7
2
5
8
0
3
6
9
#
FLASH
PROG
P/LND
HOLD
VDD
470K
PULSE
28
27
26
25
24
3.58MHz
OSC
5
*
SW2
100K
MODE
/PT
PULSE
TONE
7
E1 E2 E3 MEM
HKS
GND
MIC+
8
9
21
SW1
2.2K
MIC-
1µF
RXOUT
10
11
20
19
300Ω
Re
100K
GRX
IREF
VCC
1µF 4.7µF
GTX
RGRX
10µF
RGTX 68K
VLN
RA
13
14
12
REG
LN
18
17
3.6K
RB
130K
100µF
LED
RGIN
15
16
100µF
ILED
IL
390Ω
3.9K
ILINE
V1
ICC
620Ω
100nF
20Ω
390Ω
600Ω
D95TL169
Figure 4.
470nF
IMR
2.25K
22nF
GDTMF
C4
C3
C2
C1
R1
R2
R3
R4
R5
22
4
3
2
VMR
VDD
23
6
1
1
4
7
2
3
FLASH
PROG
P/LND
HOLD
470K
PULSE
28
27
26
25
24
5
8
0
6
9
#
3.58MHz
OSC
5
*
SW2
100K
MODE
/PT
PULSE
TONE
7
E1 E2 E3 MEM
HKS
GND
MIC+
8
9
21
SW1
2.2K
MIC-
1µF
RXOUT
GRX
10
11
20
19
300Ω
1µF 4.7µF
GTX
Re
RGRX
10µF
RGTX
IREF
VCC
13
14
12
REG
LN
18
17
3.6K
130K
100µF
LED
RGIN
15
16
ILED
390Ω
3.9K
ILINE
620Ω
100nF
20Ω
390Ω
D95TL170
9/15
L3914A - L3924A - L3934A
TEST CIRCUITS(continued)
Figure 5.
470nF
2.25K
GDTMF
C4
C3
C2
C1
R1
R2
R3
R4
R5
22
4
3
1.2V
Imic
ZMIC =
22nF
470K
2
VDD
23
6
1
1
4
7
2
5
8
0
3
6
9
#
FLASH
PULSE
28
27
26
25
24
PROG
P/LND
HOLD
3.58MHz
OSC
5
*
SW2
MODE
/PT
PULSE
7
E1 E2 E3 MEM
100K
TONE
HKS
GND
MIC+
Imic
8
9
21
SW1
1.2V
RXOUT
GRX
MIC-
GTX
10
11
20
19
300Ω
4.7µF
Re
RGRX
10µF
RGTX
IREF
VCC
13
14
12
REG
LN
18
17
3.6K
130K
100µF
LED
RGIN
15
16
ILED
390Ω
3.9K
ILINE
620Ω
100nF
20Ω
390Ω
D95TL171
Figure 6.
470nF
2.25K
GDTMF
VLN
C4
22
4
3
GTX=20log
Vrms
C3
C2
C1
R1
R2
R3
R4
R5
NTX measured with Vrms=0
IDD
22nF
2
VDD
23
6
1
1
4
7
2
5
8
0
3
6
9
#
FLASH
VDD
470K
PULSE
28
27
26
25
24
PROG
P/LND
HOLD
3.58MHz
OSC
5
*
SW2
100K
MODE
/PT
PULSE
TONE
7
E1 E2 E3 MEM
HKS
GND
MIC+
8
9
21
SW1
2.2K
MIC-
1µF
1µF
Vrms
RXOUT
10
11
20
19
100K
GRX
IREF
VCC
GTX
Re
RGRX
10µF
RGTX 88K
4.7µF
VLN
13
14
12
REG
LN
18
17
3.6K
130K
100µF
LED
RGIN
15
16
100µF
600Ω
ILED
390Ω
IL
3.9K
ILINE
620Ω
100nF
20Ω
390Ω
D95TL172
10/15
L3914A - L3924A - L3934A
TEST CIRCUITS(continued)
Figure 7.
470nF
2.25K
GDTMF
VLN
GDTMF=20log
VMF
C4
C3
C2
C1
R1
R2
R3
R4
R5
22
4
3
Vear
CDTMF=20log
VLN
VMF
VDD
22nF
2
IDD
RDTMF
1
23
6
1
4
7
2
5
8
0
3
6
9
#
FLASH
PROG
P/LND
HOLD
28
27
26
25
24
4.0V
470K
PULSE
3.58MHz
OSC
5
*
SW2
100K
MODE
/PT
E1 E2 E3 MEM
PULSE
TONE
7
MIC+
HKS
GND
21
8
9
SW1
2.2K
MIC-
1µF
1µF
RXOUT
20
19
10
11
10µF
100K
300Ω
GRX
IREF
GTX
Re
RGRX
RGTX 88K
4.7µF
VLN
REG
LN
13
18
17
Vear
3.6K
VCC
14
12
130K
LED
100µF
RGIN
15
16
100µF
600Ω
ILED
390Ω
IL
3.9K
ILINE
620Ω
100nF
20Ω
390Ω
D95TL173
Figure 8.
470nF
2.25K
22nF
GDTMF
Vear
Vinp
C4
22
4
3
GRX=20log
C3
C2
C1
R1
R2
R3
R4
R5
NRX with Vin=0
IDD
2
VDD
PULSE
OSC
23
6
1
1
2
5
8
0
3
6
9
#
FLASH
PROG
P/LND
HOLD
4.0V
470K
3.58MHz
28
27
26
25
24
4
7
5
*
SW2
100K
MODE
/PT
PULSE
TONE
7
E1 E2 E3 MEM
HKS
GND
MIC+
8
9
21
SW1
2.2K
MIC-
1µF
1µF
RP
20
19
RXOUT
GRX
10
11
10µF
GTX
Re
RGTX
4.7µF
RGRX
3.6K
VLN
REG
LN
IREF
18
17
13
Vear
VCC
130K
14
12
LED
15
16
100µF
ILED
390Ω
100µF
RGIN
IL
3.9K
ILINE
Vinp
100nF
620Ω
20Ω
390Ω
D95TL167
11/15
L3914A - L3924A - L3934A
Figure 9:Typical Application Circuit.
10 R1
1N4004 x 4
TIP
D1
D4
HP5A94 Q1
D14
TPA270
100K
R3
D2
D3
10V
D15
4.7nF
C6
RING
SW1A
3.3K
R4
1.2K
R7
10M
R6
150K
R2
10K
R5
HF393
Q3
1N4140
VDD
22µF/16V
C23
220µF
16V
C1
5.6V
D10
PULSE
23
C4
C3
C2
C1
R1
R2
R3
R4
R5
6
4
3
4.7K RMF
GDTMF
22
1.2K
R14
0.47µF
25V
C10
2
1
4.7nF CMF
1
4
7
2
5
8
0
3
6
9
#
FLASH
PROG
P/LND
HOLD
28
27
26
25
24
3.579MHz x1
OSC
5
7
CERAMIC RESONATOR
BUZZER
*
E1 E2 E3 MEM
SW2
MODE
MIC+
MIC-
21
20
/PT
100K R8
HKS
8
9
SW1B
GND
RXOUT
GRX
1.2K
R15
HOOK
4.7µF/25V
10
11
13
56K
GTX
100K RGRX
3.6K R9
19
RGTX
C7
10µF/50V
REG
LN
IREF
18
17
C3
390Ω R11
3.9K R12
130K R13
VCC
ILINE
14
12
16
100µF C5
RGIN
120Ω
RS1
15
LED
1K
RAC
D12
LED
20Ω
R10
470Ω
RS2
100nF
C4
220nF
CS
D95TL175
12/15
L3914A - L3924A - L3934A
SO28 PACKAGE MECHANICAL DATA
mm
inch
DIM.
MIN.
TYP.
MAX.
2.65
0.3
MIN.
TYP.
MAX.
0.104
0.012
0.019
0.013
A
a1
b
0.1
0.004
0.014
0.009
0.35
0.23
0.49
0.32
b1
C
0.5
0.020
c1
D
45° (typ.)
17.7
10
18.1
0.697
0.394
0.713
0.419
E
10.65
e
1.27
0.050
0.65
e3
F
16.51
7.4
0.4
7.6
0.291
0.016
0.299
0.050
L
1.27
S
8° (max.)
0016572
13/15
L3914A - L3924A - L3934A
DIP28 PACKAGE MECHANICAL DATA
mm
inch
TYP.
0.025
0.018
DIM.
MIN.
0.23
15.2
TYP.
0.63
0.45
MAX.
MIN.
0.009
0.598
MAX.
a1
b
b1
b2
D
E
0.31
0.012
1.27
0.050
37.34
16.68
1.470
0.657
e
2.54
0.100
1.300
e3
F
33.02
14.1
0.555
I
4.445
3.3
0.175
0.130
L
K
C1
L
G
F
N
e3
A
28
1
15
14
B
CDIP28
0016130
14/15
L3914A - L3924A - L3934A
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications men-
tioned 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 ex-
press written approval of SGS-THOMSON Microelectronics.
1995 SGS-THOMSON Microelectronics - All RightsReserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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15/15
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