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ICM7111
SPEECH AND RINGER IC
FEATURES
* * * * * * * Includes Speech and Ringer Circuit in a single chip Operating Range From 15 to 100mA DTMF interface with adjustable gain Mute input for pulse of DTMF dialing Voltage regulator output Ring Frequency Discrimination Ring Melody Generator
ICM7111 is a low cost CMOS Speech and Ringer integrated circuit (IC) that perform all the necessary speech and line interface functions for telephone sets.
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OVERVIEW TYPICAL APPLICATION CIRCUIT
Figure 1: Typical Application Circuit
Rev. 2.1
ICmic reserves the right to change the specifications without prior notice
1
ICM7111
SPEECH AND RINGER IC
PACKAGE
24-Lead SOIC
24 Lead SOIC AGND VDD VDDI GND TXO VL LLC HS OSC1 OSC2 RGD MO 1 2 3 4 5 6 7 8 9 10 11 12 TOP VIEW 24 23 22 21 20 19 18 17 16 15 14 13 STB RXI RXO CI M1 M2 MUTEB DTMF DTMFO VUPB VCLKB N/C
Rev. 2.1
ICmic reserves the right to change the specifications without prior notice
2
ICM7111
SPEECH AND RINGER IC
PIN DESCRIPTION
Pin No 1 2 3 4 5 6 Symbol AGND VDD VDDI GND TXO VL Description
Analog Ground
Analog ground reference.
Regulated Supply Voltage
Can be used to power up external microcontroller. Supply Input Voltage Power for the chip is extracted from this pin.
Ground
Transmit Output Transmit output to be connected to external power transistor for regulating VDDI (dc) and for the modulation of line voltage.
Line Voltage
Line Loss Compensation 0V = No LLC; AGND=Low LLC; VDD=High LLC. Hook Switch Input Must be HIGH to activate the speech network. Must be LOW when line is disconnected to properly reset the speech network. Oscillator Input 3.58MHz ceramic resonator input. Oscillator Output Ring Detection Input Input for ring frequency detection. Melody Output Melody pulse output for tone ringer. Open drain NMOS. No Connection Volume Control Clock Input If VUPB = 0; VCLKB pulse increases the volume in 3 steps to maximum. If VUPB = 1; VCLKB pulse decreases the volume in 4 steps to minimum. Has weak internal pull-up. Should be connected to VDD if not used. Volume Up/Down Determines whether a pulse on VCLKB would increase or decrease the volume. Has weak internal pull-up. Should be connected to VDD if not used. DTMF Input DTMF input (or any analog input signal). Use a series resistor (for input resistance) and a series capacitor (for decoupling) to the DTMF pin. See DTMFO pin. DTMF Feedback Output DTMF feedback output. Connecting a resistor between DTMF and DTMFO pins provides feedback. Referring to Figure 1, DTMFO = (R23/R24) x DTMFin. Mute Transmitter When MUTEB is LOW, the M1/M2 mic input is blocked, and the input from DTMF pin is transmitted. Meant for DTMF dialing. Microphone Inputs Input for electret microphone. Complex Impedance Input Connecting capacitor to this pin results in complex AC impedance. Receive Output These outputs drive a dynamic earpiece. Receive Input Input for received signal. Side Tone Balance Input Side tone cancellation input.
7
LLC
8 9 10 11 12 13 14
HS OSC1 OSC2 RGD MO N/C VCLKB
15
VUPB
16
DTMF
17
DTMFO
18 19 20 21 22 23 24
MUTEB M2 M1 CI RXO RXI STB
Rev. 2.1
ICmic reserves the right to change the specifications without prior notice
3
ICM7111
SPEECH AND RINGER IC
FUNCTIONAL DESCRIPTION SYSTEM STARTUP ICM7111 generates internal power-on-reset when VDD reaches around 1.5V. Power-onreset appropriately initiates the system to a known initial state. ICM7111 stays in shutdown mode so long as HS pin stays LOW. However, the ringer circuitry is activated in this mode to monitor the incoming ringing signal. OSCILLATOR All the timing of ICM7111 is based on a clock frequency of 3.58 MHz. A crystal oscillator or ceramic resonator of this frequency should be connected to oscilator pins of ICM7111. Care has to be taken in selecting this components since in practise minor deviations from the nominal frequency may occur due to the characteristics of the oscillator used. It is recommended to connect a small value capcitors ( 47pF) in parallel with the oscillator to ensure proper start-up and operation at the nominal frequency. TONE RINGER The tone ringer of ICM7111 consists of ring detection circuit and melody generator circuit. Ring Detection Circuit Ring detection circuit will assures the signal that present on RGD pin input is valid. The signal is considered as a valid signal if the signal has frequencies between 13Hz and 70Hz. Melody Generator Once the valid ring signal is detected on the ring detection (RGD) pin and is present for about 75 ms continously, the melody generator will be actived, the ring signal will be monitored continously and the melody generator will be immediately turn on or off according to the momentary presence of a valid or unvalid ring signal respectively until next power on reset or off-hook. The melody generator of ICM7111 creates 2 frequencies of 1250Hz and 1600Hz. SPEECH NETWORK The speech network of ICM7111 consists of a transmitter and a receiver path, side tone cancellation and line loss compensation. The speech network is activated as soon as the phone goes off-hook (i.e. when HS pin goes HIGH). Transmit For 600 ohm termination, the typical transmit gain from microphone input to the line voltage is 35dB. Receive Typical receive path gain is 3dB for 600 ohm termination. Side Tone Cancellation As shown in the typical application circuit, side tone cancellation can be achieved best by balancing the Whitestone bridge of R11, R12, and R13 + R14//C6 (refer to Figure 1). Line Loss Compensation LLC input level is scanned as the phone goes off-hook (i.e. as HS pin goes HIGH). At the same time, the loop current level is sensed and determined. If LLC=0, no compensation scheme is in effect. If LLC=AGND, "low" compensation scheme is in effect. Transmit and receive gains are reduced by as much as 6dB when the loop current exceeds 50mA. If LLC=VDD, "high" compensation scheme is in effect. Transmit and receive gains are reduced by as much as 6dB when the loop current exceeds 75mA. DTMF/Analog Signal Transmission ICM7111 can transmit DTMF (or any analog signal) through DTMF pin. Referring to Figure 1, the typical transmit gain is as follow: DTMFO = (R23/R24) x DTMFin TXO = 4 x DTMFO MUTEB must be LOW for the input thru DTMF pin to be transmitted to TXO.
Rev. 2.1
ICmic reserves the right to change the specifications without prior notice
4
ICM7111
SPEECH AND RINGER IC
ABSOLUTE MAXIMUM RATING Symbol
VDDI VIN_ TSTG TSOL
Parameter
Supply Line Voltage Digital Input Voltage Storage Temperature Soldering Temperature
Value
-0.3 to 7.0 -0.3 to 7.0 -55 to +150 300
Unit
V V o C o C
Note 1: Stress greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
OPERATING RANGE Range
Commercial
o
Ambient Temperature
-25 C to 70 C
o
ELECTRICAL CHARACTERISTICS
(ILINE = 15mA unless otherwise specified) Symbol VDDI VDD AGND IDD IOL VIL VIH Parameter Regulated Line Voltage (DC) Regulated Supply Regulated AGND reference Operating Current Output Current Sink TXO, MO Input Voltage Low Input Voltage High Test Conditions ILINE: 13mA to 100mA ILINE: 13mA to 100mA ILINE: 13mA to 100mA Speech mode Ring mode VDD = 2.5V VOL = 0.4V
HS, RGD TA=25 C o RGD TA=25 C o HS TA=25 C
o
Min
Typ 4.0 3.7 1.5 3 0.3 1.5
Max
Unit V V V mA mA mA
VSS 0.7 2.7 35 12
0.3 1 VDD
VDD VDD V dB dB
Transmit (TX) GTX_M1M2 Transmit Gain (M1/M2) Transmit Gain (DTMFO to GTX_DTMF TXO) THD Distortion ZIN M1M2 Input Impedance (M1/M2) GMUTE Mute Attenuation (M1/M2) Input Voltage Range VIN M1M2 (M1/M2) Receive (RX) GRX Receive Gain (VL to RXO) THD Distortion ZIN_RXI Input Impedance (RXI) ZIN_STB Input Impedance (STB) VIN RXI Input Voltage Range
MUTEB = HIGH MUTEB = LOW VIL < 0.5 VRMS
2 20 60
+/- 1 +/- 0.5
MUTEB = LOW Differential Single Ended
% K dB Vpp Vpp dB % K K VPEAK
3 VRXI < 0.5 VRMS 8 80
+/- 2
2
Rev. 2.1
ICmic reserves the right to change the specifications without prior notice
5
ICM7111
SPEECH AND RINGER IC
Output Driver (BJT) VIN MAX Input Voltage Range VTX Dynamic Range RL Return Loss Side Tone (ST) GST Side Tone Cancellation VIN STB Input Voltage Range HS INPUT tHS-L Low to High Debounce Tone Ringer VMO Melody Output tMD Melody Delay F1 Frequency 1 F2 Frequency 2 tDT Detection Time fMIN Min. Detection Frequency fMAX Max. Detection Frequency
+/- 2 +/- 2
ZRL= 1000
18 26
+/- 2
VPEAK VPEAK dB dB VPEAK
Going off-hook
15
ms
PDM 10 1250 1600 Ring Freq = 20Hz 50 13 80 70 ms Hz Hz ms Hz Hz
Rev. 2.1
ICmic reserves the right to change the specifications without prior notice
6
ICM7111
SPEECH AND RINGER IC
PACKAGE INFORMATION 24-Lead SOIC (Unit: Inches)
Rev. 2.1
ICmic reserves the right to change the specifications without prior notice
8
ICM7111
SPEECH AND RINGER IC
Rev. 2.1
ICmic reserves the right to change the specifications without prior notice
9
ICM7111
SPEECH AND RINGER IC
DISCLAIMER
The information contained herein is current as of the date of publication; however, delivery of this document shall not under any circumstances create any implication that the information contained herein is correct as of any time subsequent to such date. ICmic reserves the right to make changes without notification, even if such changes would render information contained herein inaccurate or incomplete. ICmic makes no representation or warranty that any circuit designed by reference to the information contained herein, will function without errors and as intended by the designer.
Rev. 2.1
ICmic reserves the right to change the specifications without prior notice
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