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ST3917A 数据表(PDF) 4 Page - STMicroelectronics

部件名 ST3917A
功能描述  SPEECH - TONE/PULSE DIALER - LED INDICATOR
Download  16 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST3917A 数据表(HTML) 4 Page - STMicroelectronics

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LED (Output, Pin 15)
When the MU/MFI pin is connected to either VDD
or GND, the LED connected to the LED pin, which
functions as a keyboard illumination or off-hook
indicator, will light up when the telephone is off-
hook.
When the MU/MFI pin is connected to any row pins,
the LED connected to LED pin functions as a tone
mode indicator.
From minimum operating line current up to 20mA,
ILN-ICC is sourced into the LED with a maximum
current limit of 18mA. For line current more than
20mA, this sourced current is limited at 18mA
(typical).
ILINE (Pin 16)
A recommended external resistor of 20
Ω is con-
nected between ILINE and GND. Changing this
resistor value will influence the microphone gain,
DTMF gain, sidetone, maximum output swing on
LN and 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 charac-
teristics can be changed with an external resistor
connected between LN and REG or between REG
and ILINE.
GTX, MIC-, MIC+ (Pins 19, 20, 21)
The device has a symmetrical microphone inputs.
The amplification from microphone inputs to LN is
51dB at 15mA line current and it can be adjusted
between 43 and 51dB. The amplification is propor-
tional to the 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 on the line. The
voltage amplification from GDTMF to LN is 40dB.
Final output level on the 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
RXOUT is -32dB typically. The level of the confi-
dence tone in the earphone can be increased by
adjusting the resistor connected between GDTMF
and GRX pins, the possible range is 20dB.
VDD (Pin 23)
VDD is the positive supply for the dialing circuit and
it must meet the maximum and minimum voltage
requirements.
MU/MFI (Input, Pin 24)
A logic low input to this pin will disable the transmit
amplifier of the speech circuit. MUTE efficiency is
greater than 60dB. An open circuit to this pin will
enable the transmit amplifier. In this case, LED is
used for keypad lighting.
A connection to any row will disable the transmit
mute function and the LED connected to the LED
pin is used for tone mode indication.
Table 3 : Logic of MU/MFI Pin Indicator
MU/MFI
Pin
Transmit
Muting
LED at Pin 15
OPEN
Active
Lighted Dial Indicator
GND
Muted
Lighted Dial Indicator
Any Row
Not Available
Tone Mode Indicator
PIN DESCRIPTION (continued)
ST3917A - ST3917B
4/16


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