U4070B-FP TEMIC Semiconductors, U4070B-FP Datasheet - Page 3

• Manufacturer Part Number: U4070B-FP
• Description: Tone Ringer Interface
• Manufacturer: TEMIC Semiconductors

TELEFUNKEN Semiconductors
Rev. A1, 06-May-96
Outputs O
The bridge push-pull outputs are used for direct
connection of a piezo electric sound transducer with a
typical value of 80 nF. The output stage transistors can
process up to 20 mA in both directions.
The output signal without load is 2
R
where R
Volume Adjustment A1, A0
Pin 5 (6), 6 (7)
The ringing volume is adjusted by means of a 2-bit D/A
converter. The maximum volume is achieved with the bit
combination A1 (MSB) = 1 and A0 (LSB) = 1. The
volume can be reduced by approximately 35 dB (A) if a
bit combination of A1 = 0, A0 = 0 is supplied. The volume
is programmed by supplying a ground potential to these
inputs.
Melody, Pin 7 (9)
The melody input inverts the activation phase of the
bridge push-pull output stage. The input is CMOS-
compatible
frequencies.
i
+
V
V
load
(12,11
(12,11)
= 400
and
open
load
1
, O
W
suitable
– 1
2
2 kV
Pin 11, 12
for
R
load
processing
Preliminary Information
(V
10
B
m
- V
F
DD
Figure 2. Test circuit
– 3.5 V)
ringing
110
W
15
Supply Voltage V
An external load, such as a microcomputer, can be
connected to V
maximum load current of 1.5 mA. V
and can block up to 6 V in call and idle states. The typical
value of the back-up capacitor is 47
Frequency Detection 2f, Pin 4 (5)
Frequency detection takes place in the microcomputer.
For this purpose, the output 2f supplies a square wave
signal
microcomputer. The output signal is CMOS-compatible.
This terminal is highly resistive in idle and call states.
Comparator Threshold Adjustment
TH Pin 3 (4)
The on/ off threshold of the 2f comparator can be adjusted
( terminal against ground respectively V
Bundespost specification this terminal should be open.
V
Decoupling diode for dc supply.
W
DC,
Pin 8, 9
with
0.22
25
m
W
F
DD
double
. This value of V
Tone ringing
Figure 1
DD,
ringing
b
a
Pin 10 (12)
U4074B
DD
m
frequency
F.
DD
DD
is highly resistive
is 3.5 V for a
). To fulfill the
to
93 7575 e
3 (6)
the