U4074B
U4074B is Tone Ringer Interface manufactured by TEMIC Semiconductors.
Description
The U4074B is a monolithic integrated circuit that contains all integral ponents of a ringing circuit for telephone sets used in conjunction with a microputer. The bination of a microputer and the U4074B permits flexible programming of the ringing sequence ( melody), tone and volume control. Ringing frequency detection takes place in the microputer. The U4074B is responsible for the interface to the line, driver stages for the piezoelectric sound transducer, volume adjustment, amplitude detection, voltage supply for the microputer and other auxiliary functions.
Features
D Suitable for specifications FTZ 1TR2 and ETR 2 D Rectifier bridge D Z-diode D Amplitude detection D Supply voltage for microputer 3.5 @ D DC operation possible D Bridge push-pull output stage
22 m F V B 2(3) TH 130 k W 3(4) VDD 10 (12) 2f 4(5) 47m F
D CMOS-patible microputer interface D 2-bit log. volume adjustment D High-voltage bipolar technology, 30 V v 1.5 m A
Benefits
D m C controlled melody and volume D Low number of external ponents
On/Off a 0.8m F (1)1 a
2.2 k W Ringing signal b (16)14 b
Ȁ
+V B 12(14) O2
Control
VRef
Ȁ
2f Decoder and DA converter +V B PIEZO O1 Transducer 11(13)
93 7793 e
(15)13 GND 5(6) A1 Volume
6(7) (9)7 Mel A0
VDC 8(10)
9(11)
Figure 1. Block diagram and application circuit ( pin connections for SO16 in brackets )
TELEFUNKEN Semiconductors Rev. A1, 06-May-96
1 (6)
Preliminary Information
Pin Configuration aȀ
1 2 3 4 5 6 7 8
94 7904 e
16 15 14 13 12 11 10 9 bȀ GND O2 O1 VDD aȀ
1 2 3 4 5 6 7
94 7903 e
14 bȀ
NC VB TH 2f A1 A0 NC
VB TH 2f A1
13 GND 12 O2 11 O1 10 VDD 9 8 VDC VDC
VDC VDC Mel A0 Mel
Pin 1, 14 (1,16) 2 (3) 3 (4) 4 (5) 5, 6 (6, 7) 7 (9) 8, 9 (10, 11) 10 (12) 11, 12 (13, 14) 13 (15) (2, 8)
Symbol aȀ, bȀ VB TH 2f A1, A0 Mel VDC VDD O1, O2 GND NC
Function AC ringing signal input Output to charging capacitor parator threshold adjustment input Output for frequency detection Digital volume adjustment input Input for...
