U4037B-NFLY

U4037B-NFLY Datasheet


U4037B-N

Part Datasheet
U4037B-NFLY U4037B-NFLY U4037B-NFLY (pdf)
Related Parts Information
U4037B-NFLG3Y U4037B-NFLG3Y U4037B-NFLG3Y
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• DC Characteristic Adjustable
• Receive Gain Adjustable
• Symmetrical Input of Microphone Amplifier
• Anti-clipping in Transmit Direction
• Automatic Line-loss Compensation
• Symmetrical Output of Earpiece Amplifier
• Built-in Ear Protection
• DTMF and MUTE Input
• Adjustable Sidetone Suppression Independent of Sending and

Receiving Amplification
• Power Down
• Tone-ringer Interface
• 2-bit D/A for Volume Control
• Supply Voltages for All Functional Blocks of a Subscriber Set
• Operation Possible from 8-mA Line Currents

Microcontrollercontrolled Speech and Ringer Circuit

U4037B-N
• Telephone Sets
• Complete System Integration of Analog Signal Processing on One Chip
• Very Few External Components

The microcontroller-controlled telephone circuit U4037B-N is a linear integrated circuit for use in telephone sets. It contains the speech circuit, tone-ringer interface, sidetone equivalent and ear-protection rectifiers. The circuit is line powered and contains all components necessary for amplification of signals and adaptation to the line.

Figure Block Diagram

Speech circuit

Power supply

PWR Microcontroller

Tone ringer

Pin Configuration

Figure Pinning SO24

MICO 1 ST 2

TXACL 3 AGA 4

DTMF 5 VOL1 6 MU/VOL2 7

MEL 8 PD 9

VMP 10 VRING 11

OUT2 12
24 MIC2 23 MIC1 22 RECO2 21 RECO1 20 RIF 19 RECIN 18 VB 17 IMP 16 GND 15 VL 14 IND 13 OUT1
2 U4037B-N

U4037B-N

Table Pin 1 2 3 4 5 6
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Pin Description

Symbol Function

MICO Output of microphone preamplifier

Sidetone reduction input, input resistance is approximately 25

TXACL Time constant of anti-clipping in transmit path

Automatic gain adjustment with line current, a resistor connected from this pin to GND sets the starting point maximum gain change 6 dB

DTMF Input for DTMF signals

VOL1 2-bit volume adjustment for tone ringer

MU/VOL2
1 2-bit volume adjustment for tone ringer 2 Mute of microphone amplifier:
- Speech condition, input MU/VOL2 low - DTMF condition input MU/VOL2 high DTMF signal at pin 5 is fed to the line. A part of the DTMF
signal is passed to the receiving amplifier as a confidence signal during dialing

Input for melody

Active high input for reducing the current consumption of the circuit, VL simultaneously is shorted by an internal switch
3.4V regulated supply voltage for peripheral circuits especially microprocessors , minimum output current 2 mA ringing , 4 mA speech mode

VRING Input for ringer supply voltage
Ordering Information

Extended Type Number U4037B-NFLY U4037B-NFLG3Y

Package Information

Package SO24

Remarks Pb-free Taped and reeled, Pb-free

Package SO24

Dimensions in mm
technical drawings according to DIN specifications
8 U4037B-N

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Datasheet ID: U4037B-NFLY 519487