Page 1
.
HOOK SWITCH DRIVER
.
RING INDICATOR
.
LINE INTERFAC E
- DC TERMINATION (4V AT 20mA )
- 2W/4W HYBRID CONVERTER
- FLAT FREQUENCY RESPONSE DOWN TO
10Hz FOR 56Kps MODEM
.
INTERFACE WITH CAPACITIVE ISOLATION
BARRIER
.
CALLER ID INTERFA CE
.
DIGITAL PHONE LINE OR OVER LOOP
CURRENT LIMIT DETECT
.
PHONE LINE IN USE CHECK
APPLICA TIONS
.
MODEMS UP TO V.34, 33.6KBPS A ND 56K bps
.
PCMCIA CARDS
.
FAX MA CHINES
.
PERSONAL DIGITAL ASSISTANTS
.
ANSWERING MACHINES
.
HIGH FEATURE PHONES
.
WEBPHONES AND SET TOP BOXES
DESCRIPTION
ST952 is a line interface designed to implement
Modem application up to 56Kbps and Voice applications.
ST952 interfaces between telephone line and capacitive isolation barrier.
A complete D. A.A. is made with ST75951 which
interfaces between capacitive isolation barrier and
the DSP or HSP signals.
Tip
Digital
ST75951 ST952
Signals
It incorporates Krypton Isolation Inc. patented silicon DAA technology.
The ring burst signal is detected by ST952 and is sent
to ST75951 through the capacitive isolation barrier.
Using t he control signals given by ST7 5951, through
the cap ac itiv e isolation barrier, ST952 ac ti va tes t he
off-hook or the CLID external transistor sw it c h.
Ring
ST952
D.A.A. LINE INTERFACE
PRELIMINARY DATA
TQFP32
(Thin Plastic Quad Flat Pack)
ORDER CODE :
If CLID external transistor switch is enabled, a
limited amount of current, less than 1mA, is drawn
from the line.
In off-hook state, ST952 DC voltage, 4V at a 20mA
line current, allows to interface with most of public
networks in the world.
The return loss is externally adjustable t o real or
complex impedance.
In case of a wrong connection in a digital phone
line, ST952 detects the over current value and
sends to ST75951 an alert signal through the ca pacitive isolation barrier.
Before starting a line connection, ST952 is abled
to check if the line is used by an other terminal
connected on the same telephone line.
PIN CONNECTIONS
16
17TER1
SET
VDR
LINE
IDG
952-02.EPS
IDI
LINI
GAIN
18
19
20
21
22
23
24
25 26 27 28 29
(7 x 7 x 1.4mm)
TER2
VDREF
IREF
AIN
AOUT
LCOM
ST952TQF7
OHC
NC
NCNC
30 31 32
D1
NC
101112131415
COM
D2
IDC
9
8
7
6
5
4
3
2
1
LCOM
LIM1
LIM2
TOFF
D6
D5
RIN
D4
D3
952-01.EPS
December 1998
This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1/12
Page 2
ST952
PIN LIST
Pin Number Name Type Description
1 D3 Output Isolation Signal Output
2 D4 Output Isolation Signal Output
3 RIN Input Ring Signal Input
4 D5 Input Isolation Control Signal Input
5 D6 Input Isolation Control Signal Input
6 TOFF Supply Internal Reference Supply
7 LIM2 Input Loop Current Limiter Control
8 LIM1 Output Loop Current Limiter Control
9 IDC Output Caller ID Control Output
10 COM Output Off-hook & ID Commun Output
11 OHC Output Off-hook Control Output
12 N.C. - Not Connected
13 N.C. - Not Connected
14 IREF Input Current Reference Setting
15 VDREF Supply Internal Reference Pin
16 TER2 Output Current Regulator Control Feedback
17 TER1 Output Current Regulator Control Output
18 SET Input Current Regulator Filter
19 VDR Supply Line DC Voltage Regulator
20 LINE Output Line AC Signal Output
21 IDG Input Caller ID Voltage Reference Input
22 IDI Input Caller ID Signal Input
23 LINI Input Line AC Signal Input
24 GAIN Input Transmit Gain / Trans-Hybrid Loss Set
25 LCOM Ground Line Side Common Ground
26 AIN Input Analog Transmit Signal Input
27 AOUT Output Analog Transmit Signal Output
28 N.C. - Not Connected
29 N.C. - Not Connected
30 D1 Input Isolation Signal Input
31 D2 Input Isolation Signal Input
32 LCOM Ground Line Side Common Ground
Note :
Pins 12, 13, 28 and 29 must be left opened.
952-01.TBL
2/12
Page 3
PIN DESCRIPTION
D1 - D2
These pins input the A C signal modulated at Fmod
coming from ST75951 through the capacitive isolation barrier.
ST952
RIN
During the ring burst, a 1MHz oscillator is pow ered
on this pin and a 6V
and D4 to indicate the ring presence.
/1MHz signal is sent on D3
PP
D3 - D4
These pins output the AC signal modulated at Fmod
in off-hook mode and at Fmod /2 in CLID mode to
ST7 59 51 through t he capacitiv e isolatio n barrier .
In ring mode, these pins out put the ring information,
a differential 6V
/1MHz signal.
PP
D5 - D6
These control pins input a 5V
/Fmod signal com-
PP
ing from ST75951 through the capacitive isolation
barrier.
These signals control the off-hook and CLID external transistor switches and are sent to the internal
transmit demodulator and receive modulator.
Off-hook mode is enabled with a 5V
/Fmod signal
PP
sent on D5 and D6 inputs with an opposite phase
(see Figure 1). With a dedicated application it is
possible to reduce the input level to 3V
CLID mode is enabled with a 5V
.
PP
/Fmod signal
PP
sent on D5 input only ( s ee Figure 2). With a dedicated application it is possible to reduce the input
level to 3V
PP
.
Figure 1
D5
D6
5V
Fmod
5V
Fmod
LINE
DC positive line connection and line AC signal output.
LCOM
Negative line connection.
LINI
Line AC signal input in off-hook mode.
AIN - AOUT
The transmit signal coming from AIN pin is injected
in AOUT pin to the 2W/4W internal converter stage.
The line echo is minimized if R3, connected between LINE and VDR pins is equal to 620Ω.
IREF
Internal reference current source setting, R4 must
be equal to 82kΩ.
VDR
Power supply for the transmit and receive paths in
Off-Hook mode.
VDREF
Internal resistor reference.
SET
Line gyrator AC/DC filter.
OHC
When D5 and D6 inputs a 5V
/Fmod signal in
PP
opposite phase, this pin puts ON the hook swit ch
external Q1/Q2 transistor stage.
IDC
When D5 input a 5V
/Fmod sign al, this pin puts
PP
ON the CLID external Q3/Q4 transistor stage.
R2 limits t he line current in CL ID mode at 1mA
max.
COM
Commun output for off-hook and CLID external
transistor stages
TER1 - TER2
These pins control the external Q5 transistor, in
which the main part of the line current goes
through to meet the line DC, V = f(I
952-03.EPS
), termination
L
requirements.
IDI
Line AC signal input in CLID mode.
IDG
Power supply for the r ec eive path in CLID mode.
LIM1 - LIM2
200mA over current detection for device protection.
TOFF
Internal Reference Supply.
Figure 2
GAIN
R1 connected on this pin fi xes the transm it gain.
The R1 recommanded value, on a 600Ω AC line
termination, is 82Ω.
D5
D6
5V
Fmod
3/12
952-04.EPS
Page 4
ST952
BLOCK DIAGRAM
C8
Tip
2627
R8
Ring
C6
R7
R6
R2
IDG
21
CLID
Q4 Q5
Q2
R3
C3
VDR
191415
VOLTAGE
REFERENCE
C4
R4
DREF
REF
V
I
VOLTAGE
OFF-HOOK
REFERENCE
C5
TER1
TER2
R5
Q3
Q1
C1
R1
LINE
GAIN
20
24
Output
Amplifier
23
C2
LINI
IDI
22
C7
SET
R9
16 17 18
4/12
AOUT AIN
ST952
FILTER
LOW PASS
FILTER
HIGH PASS
30
31
D1
D2
Fmod
2W/4W
& HYBRID
CONVERTER
1
2
D3
D4
ST75951
RING
DETECT
3
RIN
Fmod
LIMITER
CURRENT
CLID & OFF-HOOK
SWITCH CONTROL
4
5
D5
D6
8
LIM1
7
LIM2
IDC
9
OHC
11
COM
10
TOFF
6
LCOM
25
LCOM
32
C9
952-05.EPS
Page 5
ST952
ABSOL UT E MAXIMUM RATING
(AGND = DGND = 0V , all voltages with respect to 0V)
Symbol Parameter Value Unit
V
T
MLINE
oper
Positive Line Voltage Continuous 14 V
Operating Temperature 0, +70 °C
Tstg Storage Temperature -55, +150 °C
THERMAL DATA
Symbol Parameter Value Unit
R
th (j-a)
ELECTRICAL CHARACTERI STICS
Junction-ambient Thermal Resistance Max. 80
= 25oC, unless otherwise specified)
(T
amb
Symbol Parameter Test Conditions Min. Typ. Max. Unit
DC AND AC TERMINATION (see Figure 3)
V
LINE
ZLOSS Return Loss I
RECEIVE PATH (I
Grx Receive Gain V
Grf Receive Frequency Response V
Rxhd Receive 2nd/3th/4th Harmonic Distortion V
Thl Trans-Hybrid Loss V
Rn Receive Noise Floor V
TRANSMIT PATH (IL = 20mA, f = 1kHz, V
Gtx Transmit Gain V
Gtf Transmit Frequency Response V
Txhd Transmit 2nd/3th/4th Harmonic Disto rtion V
Line Voltage IL = 20mA
IL = 120mA
= 20mA, V
L
f = 200 to 4000Hz 24
= 20mA, f = 1kHz, see Figure 4)
L
= 0dBV, V
LAC
= 0dBV, V
LAC
f = 200 to 3400Hz
f = 50 to 200Hz
= 0dBV, V
LAC
f = 150Hz
f = 1000Hz
= 0, V
LAC
Fmod = 1.5MHz
= V
LAC
f = 200-3400Hz, 100Hz BW
= 0, see Figure 4)
LAC
= -6dBV -0.5 0 0.5 dB
TAC
= -6dBV, f = 200 to 4000Hz -0.2 +0.2 dB
TAC
= -6dBV, Fmod = 1.5MHz -82 dBV
TAC
TAC
10.5
= -6dBV
LAC
= 0 -0.5 0 0.5 dB
TAC
= 0
TAC
-0.1
-0.5
= 0
TAC
= -6dBV,
TAC
30 35 dB
= 0,
4.1
-79
-82
-93 dBV
Txmax Max Line Drive Voltage 3 V
Tn Transmit Noise Floor V
= 0,
TAC
f = 200-3400Hz, 100Hz BW
-93 dBv
POWER AND DC LOGIC INPUT (see Figure 5)
V
I
LINE
OFH
Line Current ST952 Line Pin + Ic(Q5) 10 120 mA
Hook Switch Input D5 and D6 Input
Active (Off-hook)
2.7 5.25
Inactive (On-hook)
V
CLID
CLID Input D5 Input
Active (CLID On)
2.7 5.25
Inactive (On-hook)
CALLER ID RECEIVE PATH (see Figure 6)
G
I
LID
CLID Receive Gain V
RID
= -15dBV -1 0 +1 dB
TAC
CLID Line Current 1mA
RING INDICATOR (see Figure 7)
V
V
Note :
RIOF
RION
D3 & D4 Ring indicator D3 = D4 = 0
D3 = D4 = 3VPP 18
D3 and D4 are complementary outputs.
o
C/W
+0.1
+0.5dBdB
0.8VV
0.8VV
8V
V
V
dB
dB
dBV
dBV
PP
V
952-02.TBL
952-03T.BL
952-04.TBL
5/12
Page 6
ST952
Figure 3 :
Test 1
ZTER - 600
W
600
F
m
100
LAC
V
= 20 & 120mA
L
ACLINE
V
ZTER + 600
AC
I
at I
LINE
557
20
L
I
W
47k
82
W
GAIN
24
LINE
S1 opened :
- V
47k
BC
557
F
m
1
LINI
23
ZTER =
S1 closed :
- ZLOSS measured
W
W
47k
1nF
IDI
IDG
22
ZLOSS = 20.log
BC
547
BC
547
BC
547
W
620
21
39
W
F
m
47
VDR
191415
100nF
DREF
V
F
W
m
82k
4.7
REF
I
AC
S1
I
AC
+ I
L
I
ACLINE
V
BC
SET
Output
Amplifier
2627
F
m
1
CLID
VOLTAGE
REFERENCE
OFF-HOOK
REFERENCE
AOUT AIN
FILTER
LOW PASS
2W/4W
& HYBRID
CONVERTER
CURRENT
Fmod
Fmod
FILTER
ST952
HIGH PASS
30
31
D1
D2
D3
RING
DETECT
1
2
D4
3
RIN
CLID & OFF-HOOK
4
D5
TER1
VOLTAGE
TER2
16 17 18
8
LIM1
7
LIM2
LIMITER
IDC
9
OHC
11
COM
10
TOFF
6
SWITCH CONTROL
LCOM
25
LCOM
32
5
D6
100nF
6/12
VD5/1.5MHz
VD6/1.5MHz
952-06.EPS
Page 7
ST952
Figure 4 :
Test 2
= 0
= 0
= 0
LAC
TAC
and V
RAC
ACLINE
V
BC
23
LINI
557
47k
V
Gr = 20.log
W
1nF
IDI
22
LAC
600
F
m
V
W
100
20mA
BC
LINE
557
20
W
47k
F
m
1
82
W
GAIN
24
ACLINE
V
and V
ACLINE
V
Gt = 20.log
TAC
V
W
47k
IDG
LAC
@ V
RAC
ACLINE
V
V
thl = 20.log
BC
547
BC
547
BC
547
W
620
21
39
W
F
m
47
VDR
191415
100nF
DREF
V
F
W
m
82k
4.7
REF
I
SET
Output
Amplifier
2627
F
m
1
CLID
VOLTAGE
REFERENCE
OFF-HOOK
REFERENCE
AOUT AIN
FILTER
LOW PASS
2W/4W
& HYBRID
CONVERTER
CURRENT
Fmod
Fmod
FILTER
ST952
HIGH PASS
30
D1
1.5MHz
DEMODULATOR
RING
DETECT
1
D3
2
D4
31
D2
3
RIN
1.5MHz
DEMODULATOR
CLID & OFF-HOOK
4
D5
5V/1.5MHz
RAC
TAC
V
V
TER1
VOLTAGE
TER2
16 17 18
8
LIM1
7
LIM2
LIMITER
IDC
9
OHC
11
COM
10
TOFF
6
SWITCH CONTROL
LCOM
25
LCOM
32
5
D6
5V/1.5MHz
100nF
952-07.EPS
7/12
Page 8
ST952
Figure 5 :
Test 3
F
m
1
2627
600
W
F
m
100
I
LINE
W
47k
BC
557
82
W
LINE
GAIN
20
24
Output
Amplifier
47k
W
BC
557
F
m
1
23
1nF
LINI
IDI
22
BC
BC
BC
W
47k
IDG
21
CLID
W
620
REFERENCE
547
547
547
191415
VOLTAGE
39
F
m
47
VDR
W
W
82k
100nF
DREF
REF
V
I
VOLTAGE
OFF-HOOK
REFERENCE
F
m
4.7
TER1
TER2
SET
16 17 18
AOUT AIN
ST952
FILTER
LOW PASS
FILTER
HIGH PASS
30
31
D1
D2
Fmod
2W/4W
& HYBRID
CONVERTER
1
2
D3
D4
RING
DETECT
3
RIN
Fmod
LIMITER
CURRENT
CLID & OFF-HOOK
SWITCH CONTROL
4
5
D5
D6
VD5/1.5MHz
VD6/1.5MHz
8
LIM1
7
LIM2
IDC
9
OHC
11
COM
10
TOFF
6
LCOM
25
LCOM
32
100nF
952-08.EPS
8/12
Page 9
ST952
Figure 6 :
Test 4
RAC
ACLINE
V
BC
23
LINI
557
47k
22
Grid = 20.log
IDI
V
W
1nF
BC
BC
BC
W
47k
IDG
21
CLID
39
547
547
547
W
620
F
m
47
VDR
191415
VOLTAGE
REFERENCE
W
100nF
DREF
V
OFF-HOOK
REFERENCE
F
W
m
82k
4.7
REF
I
TER1
VOLTAGE
TER2
16 17 18
SET
LAC
600
F
m
100
1mA
BC
Amplifier
LINE
557
20
W
47k
GAIN
24
ACLINE
V
Output
2627
F
m
1
V
W
F
m
1
82
W
AOUT AIN
ST952
FILTER
LOW PASS
FILTER
HIGH PASS
30
31
D1
D2
8
LIM1
7
2W/4W
& HYBRID
CONVERTER
Fmod
Fmod
RING
DETECT
1
D3
2
0.75MHz
DEMODULATOR
RAC
V
D4
3
RIN
CURRENT
CLID & OFF-HOOK
4
D5
VD5/1.5MHz
LIM2
LIMITER
IDC
9
OHC
11
COM
10
TOFF
6
SWITCH CONTROL
LCOM
25
LCOM
32
5
D6
100nF
952-09.EPS
9/12
Page 10
ST952
Figure 7 :
D1
30
D2
31
D3
D4
RIN
10k
W
Ur
D5
D6
Test 5
ST952
1
2
3
4
5
DETECT
32
LCOM
RING
25
LCOM
HIGH PASS
FILTER
Fmod
Fmod
CLID & OFF-HOOK
SWITCH CONTROL
COM
11
9
OHC
10
6
TOFF
IDC
AOUT AIN
LOW PASS
FILTER
2W/4W
CONVERTER
& HYBRID
CURRENT
LIMITER
8
7
LIM2
LIM1
1mF
2627
Output
Amplifier
CLID
REFERENCE
VOLTAGE
OFF-HOOK
REFERENCE
VOLTAGE
16 17 18
TER2
TER1
SET
20
24
23
22
21
19
15
14
LINE
GAIN
LINI
IDI
IDG
VDR
V
DREF
I
REF
82
W
1mF
1nF
47k
620
47mF
100nF
82k
4.7mF
BC
557
47k
W
BC
557
W
W
W
BC
547
47k
W
BC
547BC547
39
W
100nF
For Ur = V1, no signal on D3/D4
For Ur = V2, 6V
/1MHz on D3/D4
PP
952-10.EPS
10/12
Page 11
ST952
TYPICAL APPLICATION
Tip
W
10
W
22k
47nF
D4
D6
Q4
D5
D7
47k
SMTPA
270
Ring
22k
47nF
W
(5V Supply on ST75951)
W
82k
1mF
82
1nF
47k
W
W
100nF
Q5
W
47k
Q1
W
13V
Q2
Q3
W
620
F
m
47
100nF
W
39
ST952
LINI
23
ST75951
GAIN
24
D1
OHC
11
10
COM
TER1
17
TER2
16
RIN
3
LINE
20
IDI
22
IDG
21
IDC
9
VDR
19
VDREF
15
IREF
14
SET
18
F
m
LCOM
25
4.7
LCOM
32
6
TOFF
D2
D3
D4
D5
D6
LIM2
LIM1
AOUT
AIN
30
31
1
2
4
5
7
8
27
26
1mF
35
34
31
30
27
26
D1
D2
D3
D4
D5
D6
MCLK
SCLK
FS
DIN
DOUT
RESET
PWRDWN
HC1
46
47
43
11
8
2
3
P
R
O
C
E
S
S
O
R
9
952-11.EPS
11/12
Page 12
ST952
PACKAGE MECHANICAL DATA
32 PINS - PLASTIC THIN QUAD FLAT PACK (TQFP)
32 25
1
e
24
E3
E1
E
A
A2
A1
0,10 mm
.004 inch
SEATING PLANE
B
17
L1
c
L
K
0,25 mm
.010 inch
GAGE PLANE
Dimensions
8
916
D3
D1
D
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 1.60 0.063
A1 0.05 0.15 0.002 0.006
A2 1.35 1.40 1.45 0.053 0.055 0.057
B 0.30 0.37 0.45 0.012 0.015 0.018
C 0.09 0.20 0.004 0.008
D 9.00 0.354
D1 7.00 0.276
D3 5.60 0.220
e 0.80 0.031
E 9.00 0.354
E1 7.00 0.276
E3 5.60 0.220
L 0.45 0.60 0.75 0.018 0.024 0.030
L1 1.00 0.039
K0
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No licence is granted by implicat ion or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or sys te ms
without express written approv al of STMi cr oelec troni cs.
Purchase of I
Rights to use these components in a I
Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
The ST logo is a registered trademark of STMicroelectronics
© 1998 STMicroelectronics - All Rights Reserved
2
C Components of STMicroelectronics, conveys a license under the Philips I2C Pate n t .
2
the I
C Standard Specifications as defined by Phili ps.
STMicroelectronics GROUP OF COMPANIES
2
C system, is granted provided that the system conforms to
http://www.st.com
o
(Min.), 7o (Max.)
12/12
PM-5V.EPS
5V.TBL
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