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參數(shù)資料
| 型號(hào)： | L3924A |
| 文件頁(yè)數(shù)： | 4/15頁(yè) |
| 文件大?。?/td> | 209K |
| 代理商： | L3924A |
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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 resistorvalue
will influence the microphone gain, DTMF gain,
earphone gainand sidetone.
V
CC
Pin 14, V
CC
is the positive supply of the speech
network. It is stabilized by a decouplingcapacitor
between V
CC
and GND. The V
CC
supply voltage
may also be used to supply external peripheral
circuits.
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 phonegoes off-hook.
I
LINE
Pin 16. A recommended external resistor of
20ohm is connected between I
LINE
and GND.
Changing this resistor valuewill have influenceon
microphone gain, DTMF gain, sidetone,maximum
outputswing on LN and on the DC characteristics
(especiallyin the lowvoltage region).
LN
Pin 17. LNis the positive line terminalof 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
externalresistor connected between LN and REG
or between REG and I
LINE
.
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 inputsto
LN is 51.5dB and it can be adjusted between 43.5
and 51.5dB.The amplification is proportionalto ex-
ternalresistor connectedbetweenGTXand REG.
GDTMF
Pin 22. When the DTMF input is enabled, the mi-
crophoneinputs 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
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.
V
DD
Pin 23. V
DD
is the positive supply for the dialing
network and must meet the maximum and mini-
mum voltage requirements.
DEVICEOPERATION
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 stillvalid following 32ms of de-
bounce, the digit is stored into memory, and dial-
ing
begins
after
a
approximately 40ms (measured from the initial
key closure). Outputtone 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 beginningof LND
buffer, and the first 32 digits will no longer be
availablefor redial.
pre-signal
delay
of
Table 2:
DTMF Output Frequency
Key Input
Stadard
Frequency
697
770
852
941
1209
1336
1477
Actual
Frequency
699.1
766.2
847.4
948.0
1215.9
1331.7
1471.9
% Deviation
ROW 1
ROW 2
ROW 3
ROW 4
COL 1
COL 2
COL 3
+0.31
–0.49
–0.54
+0.74
+0.57
–0.32
–0.35
NORMAL DIALING
D1
Normal dialing is straighforward, all keyboard en-
tries will be stored in the buffer and signaled in
succession.
D2
D3
....etc
PROGRAMMING AND REPORTORY DIALING
To program, enter the following:
PROG
D1
D2
or
PROG
D1
D2
During programming, dialing is inhibited.
Dn MEM (location0-9)
Dn E1-E3
FUNCTION PIN DESCRIPTION
(continued)
L3914A - L3924A - L3934A
4/15
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