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PDF ST952 Data sheet ( Hoja de datos )
| Número de pieza | ST952 | |
| Descripción | D.A.A. LINE INTERFACE | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ST952 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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ST952
... HOOK SWITCH DRIVER
RING INDICATOR
LINE INTERFACE
- 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 INTERFACE
. DIGITAL PHONE LINE OR OVER LOOP
CURRENT LIMIT DETECT
. PHONE LINE IN USE CHECK
.......APPLICATIONS
MODEMS UP TO V.34, 33.6KBPS AND 56Kbps
PCMCIA CARDS
FAX MACHINES
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 appli-
cations.
ST952 interfaces between telephone line and ca-
pacitive isolation barrier.
A complete D.A.A. is made with ST75951 which
interfaces between capacitive isolation barrier and
the DSP or HSP signals.
Digital
ST75951
Signals
ST952
Tip
Ring
It incorporates Krypton Isolation Inc. patented sili-
con DAA technology.
The ring burst signal is detected by ST952 and is sent
to ST75951 through the capacitive isolation barrier.
Using the control signals given by ST75951, through
the capacitive isolation barrier, ST952 activates the
off-hook or the CLID external transistor switch.
D.A.A. LINE INTERFACE
PRELIMINARY DATA
TQFP32 (7 x 7 x 1.4mm)
(Thin Plastic Quad Flat Pack)
ORDER CODE : ST952TQF7
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 to 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
TER1
SET
VDR
LINE
IDG
IDI
LINI
GAIN
16 15 14 13 12 11 10 9
17 8
18 7
19 6
20 5
21 4
22 3
23 2
24 1
25 26 27 28 29 30 31 32
LIM1
LIM2
TOFF
D6
D5
RIN
D4
D3
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
1 page  
ST952
ABSOLUTE MAXIMUM RATING (AGND = DGND = 0V, all voltages with respect to 0V)
Symbol
Parameter
Value
VMLINE
Toper
Tstg
Positive Line Voltage Continuous
Operating Temperature
Storage Temperature
14
0, +70
-55, +150
Unit
V
°C
°C
THERMAL DATA
Symbol
Rth (j-a)
Parameter
Junction-ambient Thermal Resistance
Max.
Value
80
Unit
oC/W
ELECTRICAL CHARACTERISTICS (Tamb = 25oC, unless otherwise specified)
Symbol
Parameter
Test Conditions
DC AND AC TERMINATION (see Figure 3)
VLINE Line Voltage
ZLOSS Return Loss
IL = 20mA
IL = 120mA
IL = 20mA, VLAC = -6dBV
f = 200 to 4000Hz
RECEIVE PATH (IL = 20mA, f = 1kHz, see Figure 4)
Grx
Grf
Rxhd
Receive Gain
Receive Frequency Response
Receive 2nd/3th/4th Harmonic Distortion
VLAC = 0dBV, VTAC = 0
VLAC = 0dBV, VTAC = 0
f = 200 to 3400Hz
f = 50 to 200Hz
VLAC = 0dBV, VTAC = 0
f = 150Hz
f = 1000Hz
Thl Trans-Hybrid Loss
Rn Receive Noise Floor
VLAC = 0, VTAC = -6dBV,
Fmod = 1.5MHz
VLAC = VTAC = 0,
f = 200-3400Hz, 100Hz BW
TRANSMIT PATH (IL = 20mA, f = 1kHz, VLAC = 0, see Figure 4)
Gtx
Gtf
Txhd
Txmax
Tn
Transmit Gain
Transmit Frequency Response
Transmit 2nd/3th/4th Harmonic Distortion
Max Line Drive Voltage
Transmit Noise Floor
VTAC = -6dBV
VTAC = -6dBV, f = 200 to 4000Hz
VTAC = -6dBV, Fmod = 1.5MHz
VTAC = 0,
f = 200-3400Hz, 100Hz BW
POWER AND DC LOGIC INPUT (see Figure 5)
ILINE
VOFH
Line Current
Hook Switch Input
VCLID CLID Input
ST952 Line Pin + Ic(Q5)
D5 and D6 Input
Active (Off-hook)
Inactive (On-hook)
D5 Input
Active (CLID On)
Inactive (On-hook)
CALLER ID RECEIVE PATH (see Figure 6)
GRID
ILID
CLID Receive Gain
CLID Line Current
VTAC = -15dBV
RING INDICATOR (see Figure 7)
VRIOF
VRION
D3 & D4 Ring indicator
D3 = D4 = 0
D3 = D4 = 3VPP
Note : D3 and D4 are complementary outputs.
Min. Typ. Max.
4.1
10.5
24
-0.5 0 0.5
-0.1 +0.1
-0.5 +0.5
-79
-82
30 35
-93
-0.5 0 0.5
-0.2 +0.2
-82
3
-93
10 120
2.7 5.25
0.8
2.7 5.25
0.8
-1 0 +1
1
8
18
Unit
V
V
dB
dB
dB
dB
dB
dBV
dBV
dB
dBV
dB
dB
dBV
VPP
dBv
mA
V
V
V
V
dB
mA
V
V
5/12
5 Page 
TYPICAL APPLICATION (5V Supply on ST75951)
Tip
ST952
SMTPA
270
Ring
22kW
47nF
47nF
D4 D5
Q1
D6 D7 47kW
13V
Q2
47kW
Q4 Q5
Q3
ST952
1m F
23 LINI
82W
24 GAIN
11 OHC
10 COM
D1 30
D2 31
17 TER1
16 TER2
3 RIN
D3 1
D4 2
1nF
47kW
20 LINE
22 IDI
21 IDG
D5 4
D6 5
9 IDC
19 VDR
LIM2 7
LIM1 8
15 VDREF
14 IREF AOUT 27
18 SET
25 LCOM
AIN 26
32 LCOM
6 TOFF
100nF
ST75951
35 D1
34 D2
MCLK 8
SCLK 2
FS 3
31 D3
30 D4
DIN 46
DOUT 47
RESET 43
PWRDWN 11
27 D5
HC1 9
26 D6
1m F
P
R
O
C
E
S
S
O
R
11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ST952.PDF ] | |
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