LT1684IS#TRPBF Linear Technology, LT1684IS#TRPBF Datasheet - Page 6

• Manufacturer Part Number: LT1684IS#TRPBF
• Description: IC RING TONE GENERATOR 14-SOIC
• Manufacturer: Linear Technology

Specifications of LT1684IS#TRPBF

• Function: Tone Generator
• Number Of Circuits: 1
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Voltage - Supply: -
• Power (watts): -
• Interface: -

LT1684
PI FU CTIO S
BG
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
FUNCTIONAL BLOCK DIAGRA
6
OUT
U
U
(Pin 13): Normalized PWM Buffered Output. PWM
ELEMENTS
FILTER
OUTPUT
INPUT
U
RING
PWM
–
+
(RING RETURN)
U
U
100pF
100pF
100pF
10k
10k
20pF
IN A
IN B
BG
AMPIN
COMP1
COMP2
OUT
5k
5k
5k
W
–
+
LT1684 Block Diagram
15k
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
resistors yield a 10k (nominal) differential overdrive im-
pedance.
100mV beyond the input thresholds. 5k internal input
CURRENT
LIMIT
–1.25V
1.25V
14V
14V
GATE
GATE
AT
LIM
LIM
OUT
REF
V
V
+
+
+
–
–
–
1684 BD
V
V
+
–