ETC HC34018

HC34018
Voice Switched Speakerphone Circuit for Hand Free System
HSiN Semiconductor Pte Ltd
www.hsin.com.sg
1. Overview
The HC34018 speakerphone integrated circuit incorporates the necessary amplifiers attenuators
and control functions for a high quality hands-free speakerphone system. Included are microphone
amplifier, audio power Amp for speaker, transmit and receive attenuator, a monitoring system for
background noise level and an attenuation control system which responds to the relative transmit and
receive level as well as background level. Also included are voltage regulator circuits both for internal and
external circuit. A Chip Select pin allows the chip to be powered down when not in use. The CSC34018CP
applications include speakerphone for household and business use, intercom system, automotive telephones
and others. Its features are:
All necessary level detection and attenuation control for hands-free telephone in one single chip
Background level monitoring with long time constant
Wide dynamic operating range with through signal compression
On-chip supply and reference voltage regulation
Typical 100mW output into 25
load and peak level limiting to reduce distortion
Chip Select pin for active/standby switch
Linear volume control
13
10
12
25 11
Microphone
Amp
2
23
3
Transmit
ATT
9
4
Transmit Level
DET
Noise Signal
DET
17
ATT CONT.
6
TX RX
Comparator
8
Receive Level
DET
Peak Limiter
5
7
26
Receive
ATT
15
27
Speaker Amp
14
22
19
Vcc REG
24
1
28
16
Page 1 of 6
18
20
21
2. 2 Pin Description
Pin No.
1
Symbol
CONAA
2
CONATA
3
4
INTA
OUTTA
5
INTD
6
OUTTD
7
INRD
8
OUTRD
9
10
11
12
13
14
INMC
OUTMC
CMPNV
CMPTV
INCMP
GNDP
Description
Pin No.
ATT Gain Control
15
Transmit ATT
16
Gain Control
Transmit ATT Input
17
Transmit ATT Output
18
Transmit Level
19
Detector Input
Transmit Level
20
Detector Output
Receive Level
21
Detector Input
Receive Level
22
Detector Output
Microphone Input
23
Microphone Output
24
Noise Level Compare
25
Signal Level Compare
26
Comparator Input
27
Power Ground
28
Symbol
OUTP
Description
Power Output
Input DC
Supply Voltage
Power AGC Control
Digital Chip Select Input
V+
AGCP
EN
INP
Power Input
REG
Regulation
Bias Voltage
VB
GND
Ground
OUTCMP
CONVOL
FILAC
IUTRA
INRA
CONARA
Comparator Output
Volume Control
ATT Control Filter
Receive ATT Output
Receive ATT Input
Receive ATT Gain
3. Electrical Characteristics
3. 1 Absolute Maximum Ratings
Unless otherwise specified, Tamb= 25
Parameter
V+ Terminal Voltage
Chip Select Terminal Voltage
Speaker Power Ground Voltage
Volume Control Terminal Voltage
Operating Temperature
Storage Temperature
Symbol
V+
VEN
V14
VCON
Tamb
Tstg
Value
12/-1.0
12/-1.0
3.0/-1.0
VCC/-1.0
-20 ~ 70
-65 ~ 150
Unit
V
V
V
V
3. 2 Recommended Operating Conditions
Parameter
Symbol
V+ Terminal Voltage
Chip Select Terminal Voltage
Internal Regulation Current
Volume Control Terminal
Voltage
Receive ATT Input
Signal Voltage
Microphone Amp Input
Signal Voltage
Speaker Power Ground Voltage
V+
VEN
ICC
Recommended
Conditions
Min
6.0
0
0
Value
Typ
Max
11
11
3.0
Unit
V
V
mA
0.55
VB
VIIRA
0
250
mV
VIMC
0
5.0
mV
V14
-10
10
mV
VCON
Page 2 of 6
V
3.3 Electrical Characteristics
Unless otherwise specified, Tamb= 25 , add supply voltage on pin 22, V+=7.5V, VEN=0.7V.
Receiving Mode: V8=5V; Transmitting Mode: V6=5V, V11=0V
Standby Mode: V6=5V, V11=5V
Parameter
Symbol
Test Conditions
Min
Value
Typ
Max
Unit
Supply Voltage
Supply Current
VCC Voltage
Line Regulation
Output Resistance
Dropout Voltage
VB Voltage
Output Resistance
Receive Attenuators
ATT Gain
Range
Idle Mode
IV+
VCC
VCCLIN
RO(VCC)
Vsat
VB
RO(VB)
ARA
ARA
ARAI
Receive Output Voltage
Delta OUTRA
OUTRA Sink Current
OUTRA Source Current
Input Resistance
VRAO
VRAO
ARAOL
IRAOH
RRAOH
Volume Control
VCON
V =11V, V18=0.7V
V =11V, V18=1.6V
V =7.5V
6.5V V+ 11V
ICC=3.0mA
V =5.0V
V =7.5V
VB, IB=1.7ma
Receive, f=1.0kHz
V24=VB, V27=250mV
Receive to Transmit
Receive, f=1.0kHz
V24=VB V27=250mV
Receive
Receive to Transmit
Receive
Receive
Receive
Receive
0.6VB V24 VB
4.9
2.5
5.4
65
6.0
80
2.9
250
9.0
800
5.9
150
20
300
3.3
mA
uA
V
mV
mV
V
2.0
6.0
10
dB
40
44
48
dB
-20
-16
-12
dB
1.8
2.3
3.2
100
75
1.0
3.5
5.0
3.0
8.0
V
mV
uA
mA
k
32.5
dB
24.5
Transmit Attenuators
ATT Gain
Range
Idle Mode
Transmit Output Voltage
Delta OUTRA
OUTRA Sink Current
OUTRA Source Current
Input Resistance
FILAC Terminal Voltage
ATA
ATA
ATAI
VOTA
VRAO
ATAOL
ITAOH
RTAI
VACF
Power Amplifier for Speaker
Gain
AP
Input Resistance
RIP
Output Voltage
VOP
Output High Level
VPOH
Output Low Level
VPOL
Transmit
f=1.0kHz V3=250mV
Transmit to Receive
Standby
f=1.0kHz, V3=250mV
Transmit
Transmit to Receive
Transmit
Transmit
4.0
6.0
8.0
dB
40
44
48
dB
-16.5
-13
-8.5
dB
1.8
2.3
3.2
100
3.0
8.0
V
mV
uA
mA
k
mV
mV
mV
75
1.0
3.5
Receive
Transmit
Standby
V19=20mV
V19 with capacitor to
GND
V19=0.1V,
V15=-100mA
V19= -0.1V, V15=100mA
Page 3 of 6
5.0
150
6.0
75
33
15
34
22
35
37
dB
k
2.4
3.0
3.6
V
5.5
V
600
mV
Parameter
Symbol
Speaker Amplifier
Amp Gain
Input Resistance
LOGAMPS
Receive Leakage Current
Transmit Leakage
Current
Transmit to Receive
Threshold
Transmit Detector
Comparator Output
Voltage
CP2 Current Source
Distortion
Test Conditions
AMC
RIMC
V9=10mV, f=1.0kHz
Min
Value
Typ
Max
32.5
6.5
34
10
35
16
dB
k
Unit
ILKORD
V8=VB -1.0V
2.0
uA
ILKOTD
V6=VB-1.0V
2.0
uA
Ratio of ITLI to IRLI at
20 uA
ITH
0.8
Idle
Transmit
VCCMP
ICP2
Transmit Distortion
DRA
Receive Distortion
DTA
1.2
0
4.0
10
5.0
V
INR to OUTP
V27=10mVrms,1kHz
INMC to OUTTA
V9=5.0mVrms,1kHz
13
uA
1.5
%
2.0
%
4. Test Circuit
OUT MC
Vcc
V+
1000uF
47uF
200k
100k
47k
+
12
+
0.1uF
13
4.7uF
23
11
18
IN
16
9
47uF
+
IN MC
10
+
SW1
+
4.7uF
0.068uF
20
3.3k
5
22
0.068uF
6
+
2.2M
1uF
17
7
4
27
26
19 14
18k
SW2
30k
+
28
0.047uF
1
4.3k
2
0.1uF
3
91k
VB
25
0.1uF
47uF
2.2M
+
1uF
0.0068uF 4.7k
+
24
47uF
21
18k
8
24k
IN RA
OUTTA
Page 4 of 6
+ 47uF
25
0.01uF
VB
1uF
15
OUTp
/1W
Max Gain
Vacf=6.0mV
+10
0
-10 Max Att
-20
Vacf=150mV
-30 RR=30k
-40 Vcc=V B
-50
-60
-70
dB
dB
5. Characteristics Curve
10k
+10
Max Gain
0
Vacf=150mV
-10
-20
-30
-40
RR=30k
-50 Vcc=V B
-60
-70
1M
100k
Max Att
Vacf=6.0mV
10k
0.5
0.1
dB
dB
GTX Vs.RTXRR
+10
Vacf=6.0mV
0
-10
-20
GRX Vs.RRXRR
-30
Vacf=150mV
-40
-50
ARX Vs.RRXRR
-60
Vacf=6.0mV
-70
1M
100k
RRX
RTX
ATX Vs.RTXRR
Vacf=150mV
1.0
Ratio
5.0
RRX=18K
+5
RTX=91K
0
RR=30K
-5
-15
Circuit in
-20
Receive Mode
-25
-30
-35
-40
GTX
GRX
Min
Recommanded
Level
0.2
10
0.8
0.4
0.6
Vcc/V B
0
20
200
GRX
RLO.TLO(mV)
dB
250
+5
GTX
0
-5
RRX=18K
-15 RTX=91K
-20 RR=30K
-25
-30
-35
-40
40
60 80 100 120
Vacf(mV)
0
140 160
30
VSKO MAX(Vp_p)
(RLO.TLO)
2.2uF
RLO.TLO.CPI(mV)
R=4700
C=0.068uF
IN RLI.TLI
I
C R
(1.0KH)
VB
10
(RLI.TLI.XLI)
-20
(RLO.TLO.CPL)
OUT
Vo TAGE
-40
-60
RLI.TLI.XDI.(uA)
-80
10
90
0
IN
I
VB
R=2700
120 C=0.1uF
30
100
50
150
60
150
2.2M
50
8.0
No Load
6.0
25
4.0
Load
2.0
0
70
4.0 5.0
6.0 7.0 8.0
V+(V)
RLI.TLI(mVp-p)
Page 5 of 6
9.0
10
11
1.0
6. Application Circuit
TIP
0.05uF
B
4.7k
IN4007X4
68k
27k
SW1
RING
470k
VB
Vcc
47uF
2.0k
47uF
3
10
100k
4.7k
+
+
+
13
4
5
11
2
1
28
26
4.7uF
SW2
0.068uF
0.1uF
0.068uF
MIC
22k
0.001uF
470k
1000uF
15k
7.5V
IN4737
3.3k
VB 0.05uF
0.0047uF
47k
27
0.068uF
2.2k
0.068uF 8.2k
+
10uF
47k
10k
470k
0.1uF
68k
0.01uF
1M
47k
33k
0.01uF
0.001uF
25
1.0uF
17
4.7k
0.1uF
16
18
7
27
8
22
9
15
0.01uF
7. Package Dimensions
Page 6 of 6
6
2.2M
+
23
+
+
+
1.0uF
12
200k
4.3k
18k
30k
24k
91k
20k
47uF
47uF
VB
+
19
4.7uF
20
4.7uF
21
+
47uF
24
0.05uF
14
25
2.2M