U3761MB-T ATMEL [ATMEL Corporation], U3761MB-T Datasheet - Page 23

• Manufacturer Part Number: U3761MB-T
• Description: Universal Telephone IC - All Functions Integrated
• Manufacturer: ATMEL [ATMEL Corporation]

Electrical Characteristics Tone Ringer
f
Note:
Figure 16. Turn-off Delay Time
Note
4744A–CORD–09/03
RCK
Parameters
Supply current, outputs open
Switch-on threshold
Switch-off threshold
Ringing frequency
Range of external components for
R/C oscillator
Audio sequence frequency
Output voltage swing
Turn-off delay
= 4 kHz, V
Max. current into internal zener diode at pin VRING = 20 mA
VRING
VRIAC
OUT
Volt
RING
0
0
0
= 20 V, T
amb
= 25 ° C, reference point GND, unless otherwise specified
The oscillator frequency is defined by R and C at pin RCK.
The audio sequence frequency f
f
For more information on adjusting ringer melody refer to the document “Application and
Adjustment Hints”.
f
f
1H
Osc
2
Test Conditions
V
V
V
R = 150 k W , C = 1 nF
V
V
See Figure 15
=
are derived from the oscillator by internal deviders. So f
RIAC
RIAC
RIAC
RIAC
Ring
»
f
--------- -
320
Osc
------------------------------------------------------------------ -
1.594 C
, THA = open
= 25 V, C
= 20 V
> V
Melody
;
RON
f
´
1H
=
´
out
[
1
f
--------- -
t
R 3809 W
Osc
off
= 68 nF
4
+
;
f
1L
=
f
--------- -
]
Osc
5
2
and the ratio of low frequency f
Symbol
V
V
I
V
RING
ROFF
f
f
t
RON
C
R
1H
f
1L
off
out
2
1000
Min.
11.5
937
752
2.1
5.0
50
21
8
2
, f
1H
1010
Typ.
12.5
808
5.6
23
65
9
and f
U3761MB-T
1L
and high frequency
1L
t
t
t
1083
2200
Max.
are given by:
14.0
868
330
100
3.8
6.5
10
Unit
mA
V
Hz
Hz
k W
Hz
ms
pF
V
V
pp
23