參數(shù)資料
型號(hào)： LT1684IS
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 無(wú)繩電話/電話
英文描述： Micropower Ring Tone Generator
中文描述： TELEPHONE RINGER CKT, PDSO14
封裝： 0.150 INCH, PLASTIC, SOP-14
文件頁(yè)數(shù)： 6/16頁(yè)
文件大?。?/td> 221K
代理商： LT1684IS
6
LT1684
BG
OUT
(Pin 13):
Normalized PWM Buffered Output. PWM
differential input is amplitude normalized to
±
1.25V (refer-
enced to the OUT pin). This signal is used to drive the
active filter/amplifier. Filter resistor values must be chosen
to limit the maximum current load on this pin to less than
2mA. The output is current limit protected to a typical value
of
±
4.5mA.
IN A (Pin 14):
PWM Positive Input. Input is isolated from
digital source by ~100pF series capacitor. A 10k resistor
should be connected to the IN A pin in series with the
isolation capacitor for transient protection. The PWM
receiver implements a diode forward drop of input hyster-
esis (relative to IN B). This hysteresis and internal signal
limiting assure common mode glitch rejection with isola-
tion capacitor mismatches up to 2:1. For maximum perfor-
mance, however, effort should be made to match the two
PWM input isolation capacitors. Pin IN A is differentially
clamped to pin IN B through back-to back isolation-base
diodes. This results in a high impedance differential input
±
100mV beyond the input thresholds. 5k internal input
resistors yield a 10k (nominal) differential overdrive im-
pedance.
LT1684 Block Diagram
–
+
5k
10k
IN A
100pF
+
5k
10k
IN B
100pF
–
IPWM
5k
AMPIN
20pF
(RING RETURN)
100pF
FILTER
ELEMENTS
BG
OUT
COMP1
COMP2
RING
OUTPUT
15k
CURRENT
LIMIT
GATE
–
LIM
–
V
–
V
–
V
+
OUT
LIM
+
AT
REF
14V
14V
GATE
+
V
+
1684 BD
1.25V
–1.25V
PIU
FU
CTIO
AL BLOCK DIAGRAW
U
U
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PDF描述
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