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PDF TS34118CS Data sheet ( Hoja de datos )
| Número de pieza | TS34118CS | |
| Descripción | Voice Switched Speakerphone Circuit | |
| Fabricantes | Taiwan Semiconductor Company | |
| Logotipo |  |
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SOP-28
TS34118
www.DataSheet4U.com
Voice Switched Speakerphone Circuit
DIP-28
Supply Voltage Range -1.0 V to 7.0V
IVB Current 500µA
Microphone Amplifier, & Hybrid Amplifier
Gain 40 dB
General Description
The TS34118 Voice Switched Speakerphone Circuit incorporates the necessary amplifiers, attenuators, level detectors,
and control algorithm to form the heart of a high quality hands-free speakerphone system. Included are a microphone
amplifier with adjustable gain and MUTE control, Transmit and Receive attenuators which operate in a complementary
manner, level detectors at both input and output of both attenuators, and background noise monitors for both the transmit
and receive channels. A Dial Tone Detector prevents the dial being attenuated by the Receive background noise monitor
circuit. Also included are two line drive amplifiers which can be used to form a hybrid network in conjunction with an
external coupling transformer. A high-pass filter can be used to filter out 60Hz noise in the receive channel, or for other
filtering functions .A Chip Disable pin permits powering down the entire circuit to conserve power on long loops where
loop current is at a minimum.
The TS34118 may be operated from a power supply, or it can be powered from the telephone line, requiring typically
5.0mA. The TS34118 can be interfaced directly to Tip and Ring (through a coupling transformer) for stand-alone
operation, or it can be used in conjunction with a handset speech network and/or other features of a feature phone
Features
Improved attenuator gain range: 52dB between
transmit and receive.
Low voltage operation for line-powered applications
(3.0-6.5V).
4-point signal sensing for improved sensitivity.
Back ground noise monitors for both transmit
and receive paths.
Microphone amplifier gain set by external
resistors-mute function included.
Chip disable for active/standby operation.
On board filter pinned-out for user defined function.
Dial tone detector to inhibit receive idle mode during
dial tone presence.
Compatible with TS34119 speaker amplifier.
Standard 28-pin plastic DIP package and SOP
package available.
Ordering Information
Part No.
TS34118CD
TS34118CS
Operating Temp.
-20 ~ +70 oC
Package
DIP-28
SOP-28
Absolute Maximum Rating
Description
Supply voltage (pin 4)
Voltage at CD (pin 3), MUT (pin 12)
Voltage at VLC (pin 13)
Voltage at TXI (pin 9),RXI (pin 21),FI(pin 2)
Storage temperature range
Value
-1.0, +7.0
-1.0,Vcc +1.0
-1.0,Vcc +0.5
-0.5,Vcc +0.5
-65 to +150
Unit
V
V
V
V
oC
TS34118
1-20 2004/09 rev. B
1 page  
www.DataSheet4U.com
Pin Function Description
Pin Name
Description
1 FO Filter output. Output impedance is less than 50 ohms.
2 FI Filter input. Input impedance is greater than 1.0Mohm.
3
CD
Chip Disable. A logic low(<0.8V) sets normal operation. A logic high (>2.0V) disables the IC to
conserve power. Input impedance is norminally 90KΩ.
4
Vcc
A supply voltage of +2.8 to +6.5 volts is required, at ≈5.0mA. As Vcc falls from 3.5 to 2.8volts,
an AGC circuit reduces the receive attenuator gain by ≈25dB (when in the receive mode).
5
HTO+
Output of the second hybrid amplifier. The gain is internally set at –1.0 to provide a differential
output, in conjunction with HTO-, to the hybrid transformer.
6 HTO- Output of the first hybrid amplifier. The gain of the amp is set by external resistors.
7 HTI Input and summing node for the first hybrid amplifier . DC level is≈VB.
8
TXO
Output of the transmit attenuator. DC level is approximately VB.
9 TXI Input to the transmit attenuator. Max. Signal level is 350m Vrms . Input impedance is 10KΩ.
10 MCO Output of the microphone amplifier. The gain of the amplifier is set by external resistors.
11 MCI Input and summing node of the microphone amplifier. DC level is≈ VB.
Mute input. A logic low(<0.8V) sets normal operation. A logic high (>2.0V) mutes the
12
MUT
microphone amplifier without affecting the rest of the circuit. Input impedance is norminally
90KΩ.
Volume control input. When VLC=VB , the receive attenuator is at maximum gain when in the
13 VLC receive mode. When VLC=0.3VB, the receive gain is down 35dB. Does not affect the transmit
mode.
14 CT An RC at this pin sets the response time for the circuit to switch modes.
An output voltage≈Vcc/2. This voltage is a system ac ground, and biases the volume control. A
15 VB filter cap is required
16
CPT
An RC at this pin sets the time constant for the transmit background monitor.
17
TLI2
Input to the transmit level detector on the mike/speaker side.
18
TLO2
Output of the transmit level detector on the mike/speaker side, and input to the transmit
background monitor.
19 RLO2 Output of the receive level detector on the mike/speaker side.
20
RLI2
Input to the receive level detector on the mike/speaker side.
21
RXI
Input to the receive attenuator and dial tone detector. Max input level is 350mV RMS. Input
impedance is ≈10KΩ.
22
RXO
Output of the receive attenuator. DC level is approximately VB.
23
TLI1
Input to the transmit level detector on the line side.
24 TLO1 Output of the transmit level detector on the line side.
25
RLO1
Output of the receive level detector on the line side, and input to the receive background
monitor.
26
RLI1
Input to the receive level detector on the line side.
27
CPR
An RC at this pin sets the time constant for the receive background monitor.
28
GND
Ground pin for the entire IC.
TS34118
5-20 2004/09 rev. B
5 Page 
www.DataSheet4U.com
Attenuator Control Block
4) The circuit will switch to the slow idle mode when a) both talkers are quiet (no speech present), or b) when one talker’s
speech level is continuously overridden by noise at the other speaker’s location.
The time required to switch the circuit between transmit, receive, fast idle and slow idle is determined in part by the
components at the CT pin (pin 14). (see the section on Switch Time for a more complete explanation of the switching
time components). A schematic of the CT circuitry is shown in Figure 6, and operates as follows:
-RT is typically 120KΩ, and CT is typically 5.0µF.
-To switch to the receive mode, I1 is turned on (I2 is off), charging the external capacitor to +240mV above VB. (An
internal clamp prevents further charging of the capacitor.)
-To switch to the transmit mode, I2 is turned on (I1 is off) bringing down the voltage on the capacitor to –240mV with
respect to VB.
-To switch to idle quickly (fast idle), the current sources are turned off, and the internal 2.0KΩ resistor is switched in,
discharging the capacitor to VB with a time constant = 2.0K×CT.
-To switch to idle slowly (slowly idle), the current sources are turned off, the switch at the internal 2.0KΩ resistor is
open, and the capacitor discharges to VB through the external resistor RT with a time constant = RT × CT.
Figure 6. CT Attenuator Control Block Circuit
Microphone Amplifier
The microphone amplifier (pins 10,11) has the non-inverting input internally connected to VB, while the inverting input and
the output are pinned out. Unlike most op-amps, the amplifier has an all-NPN output stage, which maximizes phase
margin and gain-bandwidth. This feature ensures stability at gains less than unity, as well as with a wide range of reactive
loads. The open loop gain is typically 80dB (f<100Hz), and the gain-bandwidth is typically 1.0MHz (see Figure 16). The
maximum p-p output swing is typically 1.0 volt less than Vcc with an output impedance of <10 Ω until current limited is
reached (typically 1.5mA).Input bias current at MCI is typically 40nA out of the pin.
The muting function (Pin 12), when activated, will reduce the gain of the amplifier to ≈-39dB (with RMI=5.0KΩ) by shorting
output to the inverting input (see Figure 7). The mute input has a threshold of ≈1.5 volts, and the voltage at this pin must
be kept within the range of ground and Vcc (see Figure 17). If the mute function is not used, the pin should be grounded.
TS34118
11-20
2004/09 rev. B
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet TS34118CS.PDF ] | |
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