TCM1520A_08 [TI]
RING DETECTOR;
| 型号： | TCM1520A_08 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | RING DETECTOR |
| 文件： | 总7页 (文件大小：103K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TCM1520A
RING DETECTOR
SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990
D OR P PACKAGE
(TOP VIEW)
•
•
•
•
•
On-Chip 150-V Bridge Diode Configuration
†
Reliable BIDFET Technology
High Standby Impedance . . . 1 MΩ Typ
AC INPUT
INVERTING OUTPUT
COMMON
AC INPUT
1
2
3
4
8
7
6
5
COMMON
Efficient High-Voltage Operation
C FILTER
Output Compatible With TTL, NMOS, and
CMOS
5-V OUTPUT
BELL TAPPING SENSE
•
•
Built-In 5-V Series Regulator
TCM1520A APPLICATION
Built-In Lightning and Transient Protection
Phone Line
AC Ring
Signal
description
The TCM1520A is a monolithic ring-detection
integrated circuit designed for use in isolated or
nonisolated telephone applications. The device
uses a modified form of the Texas Instruments
TCM1520A
†
BIDFET technology to combine low-voltage
Electronic Telephone
or Accessory
TTL/NMOS/CMOS
Microprocessor
CMOS and high-voltage bipolar input/output
circuitry. It features efficient high-voltage (40 V to
150 V) operation with a typical current drain of
1 mA.
AVAILABLE OPTIONS
PACKAGE
During standby, the input impedance is
approximately 1 MΩ or greater, which prevents
any interference with parallel off-hook telephones
transmitting DTMF or voice frequencies. The
device achieves this high input impedance with an
on-chip series zener diode that does not conduct
until the voltage across AC INPUT (pins 1 and 8)
exceeds 8 V. When the voltage across pins 1 and
T
SMALL OUTLINE
PLASTIC DIP
A
‡
(D)
(P)
–40°C to 85°C
TCM1520AD
TCM1520AP
‡
The D package is available taped and reeled with suffix R
added to the device type (i.e., TCM1520ADR).
8 exceeds 18 V, the internal switch is closed, which bypasses the 6.8-V zener diode series resistor. This allows
more efficient power transfer to the load when the device is in the operating mode. In the operating mode, the
impedance of the device varies from 30 kΩ to 7 kΩ over the ring signal of 40 V at 16 Hz to 150 V at 68 Hz and
is reasonably independent of the output load.
In typical telephone applications, the TCM1520A is activated through the telephone line by a ring voltage of 40 V
at 16 Hz to 150 V at 68 Hz. The TCM1520A generates a signal suitable to drive an optocoupler or TTL, NMOS,
or CMOS logic. The 5-V OUTPUT can be used as a supply source for optocouplers or low-power logic. This
output is noninverting and is at a high level during ringing.
The TCM1520A incorporates lightning and transient protection that is designed to withstand lightning strikes
of 1.5-kV amplitude and 200-µs duration and also features built-in circuitry to avoid tapping or false triggering
due to transients.
Caution. These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive
foam during storage or handling to prevent electrostatic damage to the MOS gates.
†BIDFET – Bipolar, double-diffused, N-channel and P-channel MOS transistors on same chip. This is a patented process.
Copyright 1990, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443
TCM1520A
DUAL DIFFERENTIAL COMPARATORS
SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990
functional block diagram
1
AC INPUT
AC INPUT
Ring-Signal
Voltage Input
Section
High-Input Impedance/
Antitapping Section
5
BELL TAPPING
SENSE
8
6.8 V
Transient
Protection
Section
45 V
1A
200 Ω
8 kΩ
Current
Sensor
V
ref
6
4
C FILTER
Regulated
Voltage
Output Section
5-V OUTPUT
5-V Series
Regulator
18 kΩ
2
INVERTING
OUTPUT
3
7
COMMON
COMMON
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Continuous supply voltage at C FILTER (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V
Continuous differential input voltage, V (AC INPUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V
ID
Continuous output current at 5-V OUTPUT, I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mA
O
Continuous SCR on-state input current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mA
SCR on-state input current, I (duration ≤200 µs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 mA
I(on)
Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to 105°C
A
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to 125°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values, unless otherwise noted, are with respect to COMMON (pin 7).
DISSIPATION RATING TABLE
T
= 25°C
OPERATING FACTOR
T = 85°C
A
POWER RATING
A
PACKAGE
POWER RATING
ABOVE T = 25°C
A
D
P
950 mW
7.6 mW/°C
8.0 mW/°C
494 mW
1000 mW
520 mW
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443
TCM1520A
RING DETECTOR
SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990
recommended operating conditions
MIN
40
MAX
150
85
UNIT
V
Input voltage, V rms (f = 15.3 Hz to 68 Hz) (see Note 2)
I
Operating free-air temperature, T
–40
°C
A
NOTE 2: Input voltage is applied to AC INPUT (pins 1 and 8) through a series 2.2-kΩ ±10% resistor and a 0.47-µF ±10% capacitor. (see
Figures 1, 4, and 5.)
electrical characteristics over recommended operating free-air temperature range, R = open,
L
C
= 10 µF (unless otherwise noted)
(fltr)
detector section
†
‡
TYP
PARAMETER
MIN
MAX
UNIT
TEST CONDITIONS
Collector-emitter output breakdown voltage,
INVERTING OUTPUT
V
V
V
≤ 5 Vrms,
I
I
= 5 µA
45
V
(BR) CEX
ID
O
V
V
V
V
Low-level output voltage, INVERTING OUTPUT
Positive-going input threshold voltage
= 25 Vrms,
= 1.6 mA
1
V
V
OL
ID
O
18
7
25
IT+
IT–
hys
Negative-going input threshold voltage
6
V
Hysteresis (V
– V
)
IT–
11
V
IT+
Shunt voltage, C FILTER
On-state input current, SCR
Output voltage, 5-V OUTPUT
Standby input impedance
I
= 10 mA
38
50
50
100
V
ID
See Note 3
= 40 V,
V
V
V
I(on)
V
R
= 10 kΩ
L
4.25
5.75
V
O
ID
V rms = 3 V,
Z
I(off)
f ≤ 20 kHz
f = 16 Hz
f = 20 Hz
1
30
20
MΩ
I
V rms = 40 V,
I
Impedance when ringing
kΩ
V rms = 130 V,
I
I
See Note 3
See Note 3
55
110
1.6
mA
µA
On-state input current, SCR (see Note 4)
Input holding current, SCR
Operating current
I(on)
I
100
I(hold)
V
ID
= 40 V,
Output open
1
mA
†
All characteristics are measured with a 2.2-kΩ resistor and a 0.47-µF capacitor connected at AC INPUT (pin 1) in series with the input signal,
unless otherwise noted.
All typical values are at T = 25°C.
‡
A
NOTES: 3. These parameters are measured using pulse techniques (t ≤ 200 µs, duty cycle ≤ 5%) with C FILTER grounded.
w
4. This is the input current required to turn on the SCR.
switching characteristics at 25°C operating free-air temperature, f = 20 Hz (unless otherwise noted)
PARAMETER
MIN
MAX
UNIT
TEST CONDITIONS
V rms = 40 V
TYP
100
175
300
t
t
Turn-on time
Turn-off time
ms
on
I
V rms = 40 V
I
ms
(off)
V rms = 60 V to 150 V
I
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443
TCM1520A
RING DETECTOR
SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990
PARAMETER MEASUREMENT INFORMATION
0.47 µF,
350 V
TCM1520A
AC
INPUT
1
4
2
Output
10 kΩ
5-V OUTPUT
2.2 kΩ
V
ID
V rms = 40 V to 150 V
I
AC
INPUT
8
6
INVERTING
OUTPUT
C FILTER
COMMON
10 µF,
50 V
3
7
Figure 1. Switching Test Circuit
TYPICAL CHARACTERISTICS
CAPACITOR VOLTAGE (C FILTER)
vs
DIFFERENTIAL INPUT VOLTAGE
(AC INPUT, PINS 1 AND 8)
OUTPUT VOLTAGE (5-V OUTPUT)
vs
CAPACITOR VOLTAGE (C FILTER)
18
15
12
9
6
5
4
3
2
T
A
= 25°C
T
A
= 25°C
Comparator
Switch Fires
6
6.8-V Zener Diode
Starts to Conduct
Comparator
Switch Fires
3
0
1
0
8
10
V
12
14
16
18
20
4
5
6
7
8
9
10
– Differential Input Voltage – V
Capacitor Voltage – V
ID
Figure 2
Figure 3
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443
TCM1520A
RING DETECTOR
SCTS005B – OCTOBER 1984 – REVISED DECEMBER 1990
APPLICATION INFORMATION
C1 = 0.47 µF,
TCM1520A
TIL181
350 V
1
4
AC
INPUT
5-V OUTPUT
R1 = 2.2 kΩ
To Isolated
Output
V rms = 40 V to 150 V,
I
V
ID
15.3 Hz to 68 Hz
8
6
AC
INPUT
C FILTER
COMMON
R2 = 2.2 kΩ
C2 = 10 µF,
50 V
3
7
Figure 4. Isolated Configuration
C1 = 0.47 µF,
TCM1520A
350 V
1
4
2
AC
5-V OUTPUT
INPUT
R1 = 2.2 kΩ
V rms = 40 V to 150 V,
I
V
ID
10 kΩ
Output
15.3 Hz to 68 Hz
8
6
INVERTING
OUTPUT
AC
INPUT
C FILTER
COMMON
C2 = 10 µF,
50 V
3
7
Figure 5. Nonisolated Configuration
NOTE: See Table 1 for component functions.
TABLE 1. COMPONENT FUNCTIONS
FUNCTION
COMPONENT
R1
R2
Limits current into SCR during high-voltage transients and aids in dial-pulse rejection.
Limits current into light-emitting diode.
Blocks dc-battery voltage in standby and aids in filtering dial pulses. Smaller values of C1
improve tapping immunity.
C1
C2
Stores energy from the ring signal to power the 5-V regulator.
Optocoupler
Provides ground and transient isolation between the host system and the telephone line.
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443
6
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pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
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Copyright 1998, Texas Instruments Incorporated
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