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參數(shù)資料
| 型號： | U4078B |
| 英文描述： | Tone Ringer Interface with DC/DC Converter |
| 中文描述： | 音鈴聲接口與直流/直流轉(zhuǎn)換器 |
| 文件頁數(shù)： | 2/5頁 |
| 文件大小： | 57K |
| 代理商： | U4078B |
TELEFUNKEN Semiconductors
U4078B
2
Pin Description
Pin
1, 8
2
Symbol
a , b
V
B
Function
AC ringing signal input
Output to charging capacitor
(for supply)
Comparator threshold adjustment
input
Mode selection: inductive or
opto-coupler mode
Switching transistor connection
RC circuit for internal oscillator
input
Ground
3
TH
4
MS
5
6
ST
OSC
7
GND
1
2
3
4
8
7
6
5
a’
VB
TH
MS
GND
b’
OSC
ST
U4078B
94 7902 e
Functional Description
The ringing ac signal, supplied by the exchange via lines
a, b, is identified by a comparator circuit. An integrated
oscillator, generates a 38 kHz clock signal, f
clock
, via a
coupled 2:1 divider. With the help of the external RC
circuit, oscillation frequency is set at Pin 6. A
PNP-transistor connected at Pin 5 enables the power
transmission (transfer) in inductive or opto-coupler mode,
which is selected at Pin 4. For inductive mode, Pin 4 is
open, whereas for opto-coupler mode, Pin 4 is connected
to GND (Pin 7).
Pin 1,8: Power Supply – a , b
Pins 1 and 8 connect the circuit with the ac ringing signal
supplied by the exchange via lines a and b.
A 1
μ
F decoupling capacitor of 1
μ
F value together with a
series resistance (1.5 k
)
protect the circuit from overload
across Pins 1 and 8. The circuit features the following
overload protection across the a , b terminals:
1) It can withstand a voltage of 110 V @ 50 Hz for
maximum time of 15 seconds.
2) Testing of the circuit according to figure 2 does not
destroy the circuit under following conditions:
Charging voltage of surge capacitance: V
CS
= 2 kV
Pulse shape: 10/700
μ
s
Pulse sequence: 30 s
No. of surges: 10
Polarity change after 5 surges
Pin 2: Charging Capacitor
(power supply filtering)
After the rectification of the ringing ac signal across the
bridge circuit, the smoothing of the power supply is
provided by the external capacitance at Pin 2 (22 nF).
Pin 3: Comparator Threshold
TH
Comparator threshold
is set at ca. 12.5 V. Switching threshold can be increased or
decreased by connecting a resistance at Pin 3 w.r.t. GND.
Pin 4: Mode Selection
as regards the ringing voltage
MS
The ringing ac signal transfer (transmission) without
potential loss occurs either via an inductive or opto-coupler
mode. Pin 4 is set to a high state by an internal power source
of 4
μ
A (approximately). This switches the output (Pin 5)
to an operating state for the inductive mode. In case of
opto-coupler mode, Pin 4 is connected to the ground
(Pin 7).
Pin 5: Switching Transistor Connection
An external PNP transistor, whose emitter is at V
S
(Pin 2)
potential, serves to control the inductive or opto-coupler
mode by connecting the base of the transistor with Pin 5.
In case of inductive mode, the signal, f
clock
is interrupted
for the duration of t
pulse
= 32/f
clock
, with every transition
(rise or fall) of the ringing ac
signal, f
ring
. During the
interruption, the setting at Pin 5 is such that the coil is
critically damped (attenuated), whereas a current of 10
μ
A
flows when the transistor at Pin 5 is switched on during the
following t
pulse
up to the next edge of the pulse.
In case of opto-coupler mode, the external transistor is
switched on for a period of t
pulse
= 32/f
clock
with every flank
of the pulse of f
ring
.
Pin 5 is at high resistance upto the next edge (flank) of the
transition pulse of the ringing ac signal.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| U4080B | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:Voice-Switched Circuit for Handsfree Operation |
| U4082B | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Low-voltage Voice-switched IC for Hands-free Operation |
| U4082B-DEV-BOARD | 功能描述:射頻開發(fā)工具 Voice Switched Circuit RoHS:否 制造商:Taiyo Yuden 產(chǎn)品:Wireless Modules 類型:Wireless Audio 工具用于評估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V |
| U4082B-MFLG | 功能描述:射頻無線雜項 COM.CORDED - VOICE SWITCHED CIRCUIT RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| U4082B-MFLG3G | 功能描述:射頻無線雜項 COM.CORDED - VOICE SWITCHED CIRCUIT RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
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