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Data Sheet June 1998
L7590C Telephone Ringing Driver
Features
s
Description
The L7590C Telephone Ringing Driver produces a low-frequency sinusoidal ringing signal for analog telephone loops. This is accomplished by producing an output pulse stream that is an amplified replica of the digital input. The output is then filtered to produce a sine wave. The peak-to-peak output level is determined by the magnitude of the negative high-voltage dc applied to the device (up to -170 V). The required input is a 100 kHz CMOS-compatible pulse stream, pulse-width modulated (PWM) at the desired ringing frequency. The output stage consists of one upper and one lower drive transistor with an internal control circuit. The L7590C IC is optimized for low power dissipation and is available in a 16-pin, surface-mount package.
Applies a battery-backed, single-ended, sinusoidal ringing signal to the telephone loop Ringing capability: -- 40 Vrms into 5 North American REN -- 30 mApeak into 4 German REN Built-in current limiting Low power dissipation in idle and ringing modes Requires 5 V, a high-value negative dc supply, and a digital input sequence
s
s s s
GNDD
VDD
GNDR
CB1
CB2
OUT CURRENT LIMIT EN CLOCK CONTROL CLK LEVEL SHIFT AND OUTPUT TIMING L2 30 L1
BIAS CIRCUIT VNEG
VREF
VNEG
12-3057a (f)
Figure 1. Block Diagram
L7590C Telephone Ringing Driver
Data Sheet June 1998
Pin Information
Pin 14 3 12 8 5 16 7 1 2 9 10 15 Symbol VDD GNDD GNDR VNEG VREF CLK OUT CB1 CB2 L1 L2
EN
Type -- -- -- -- -- I O -- -- -- -- --
Name/Function +5 V Power Supply. Digital Ground. Ringing Ground. Negative Power Supply. Determines the swing of the ringing generator. Connect a 1 F capacitor from VNEG to VREF. Internal Reference Voltage. Connect a 1 F capacitor from VREF to VNEG. Clock. Modulated pulse stream. Low = 0 V. High = VDD. Ringing Generator Output. Connect to ringing relay contact through a filter. Bootstrap Capacitor. Connect a 0.1 F capacitor between CB1 and CB2. Bootstrap Capacitor. Connect a 0.1 F capacitor between CB1 and CB2. Filter Inductor. Connect an inductor to pin L2. Filter Inductor. Connect an inductor to pin L1. Not Enable. A logic low activates the internal circuitry. A logic high puts the device in a low-power powerdown mode.
Absolute Maximum Ratings (TA = 25 C)
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of this data sheet. Exposure to absolute maximum ratings for extended periods may adversely affect device reliability. Parameter VDD VNEG Timing Input Voltage Storage Temperature Range Maximum Junction Temperature Relative Humidity Range Min -- -- -0.5 -40 -- 5 Typ 7.0 -200 -- -- 150 -- Max -- -- 7.0 125 -- 95 Unit V V V C C %
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Lucent Technologies Inc.
Data Sheet June 1998
L7590C Telephone Ringing Driver
Recommended Operating Conditions
Parameter Ambient Temperature VDD Supply Voltage VNEG Supply Voltage Min -40 4.75 -170 Typ -- 5.0 -- Max 85 5.25 -130 Unit C V V
Electrical Characteristics
Electrical characteristics apply for 25 C. Unless noted, VDD = +5 V, VNEG = -170 V, EN = low, L1 = 20 mH (Rdc = 20 , Ceff = 20 pF), CLK = 100 kHz. Positive currents flow into the device. Typical is defined as 25 C. Parameter Power Supply--Idle (CLK = H or L, EN = high, dc): IDD INEG Power Dissipation Power Supply--Active, No Load: IDD INEG Power Dissipation Efficiency = {[(VOUT)2/RLOAD]/(VNEG * INEG)}: Sinking Current, RLOAD = 1400 Load to GND Sourcing Current, RLOAD = 1400 Load to VNEG ON-resistance: CLK = H, IOUT = -20 mA CLK = L, IOUT = +20 mA Current Limit Min -- -- -- -- -- -- 40 40 0 0 25 Typ -- -- -- -- -3.2 -- 80 80 10 10 -- Max 1 -50 13.5 3 -8 1.38 -- -- 20 20 40 Unit mA A mW mA mA W % % mApeak
Lucent Technologies Inc.
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L7590C Telephone Ringing Driver
Data Sheet June 1998 Operation
On the L7590C, the prefiltered output is a highvoltage replica of the PWM digital signal that is applied to the CLK input. The signal at OUT is produced by level shifting and control of the high-voltage transistors. The level is determined by the magnitude of the negative dc voltage applied to the output stage transistors. The output, ideally, should be an exact time replica of the CLK input to faithfully reproduce the modulating waveform. This high-voltage replica of the CLK input is filtered to leave only the low-frequency, high-voltage sine wave ringing signal. Figure 3, parts A and B, illustrates the PWM signal with relation to the modulating signal frequency. The PWM signal is at a 100 kHz rate and modulated at the desired ringing signal frequency, typically 20 Hz to 30 Hz. Laboratory equipment generation of the required signal is shown in Figure 5. Propagation delays and switching parameters associated with the control circuitry and output stage transistors can cause skewing which will produce a distorted output of the modulating waveform. Skewing is illustrated in Figure 4, parts A, B, and C. The skewing can be seen as an increase in the duty cycle of the L7590C output compared to the input signal duty cycle. Using the test arrangement as shown in Figure 5, the harmonic distortion of the filtered output of the L7590C was measured with two different loading circuits. With the North American 5 REN (1386 + 40 F) load, the THD was typically 2.0% to 2.5%. With the Germany 4 REN (450 + 3.4 F) load, the THD was typically 1.5% to 2.0%. The 25 Hz output of the HP* 3311A generator showed a typical THD of 1.5% when supplying a signal to the HP 8116A. A 20 resistor (RILIM) must be added between L1 and OUT for 5 REN loads.
* HP is a registered trademark of Hewlett-Packard Company.
Functional Description
Ringer Requirements
This discussion highlights some of the requirements in the United States and Germany. Beginning with the telephone set ringer to be powered, the United States requires 40 Vrms to be delivered to the equivalent of five parallel telephone sets, or 5 REN (Ringer Equivalence Number), that translates to 1386 + 40 F. In Germany, 30 mApeak must be delivered to four parallel telephone sets. In Germany, 4 REN have an impedance of 450 + 3.4 F. The difference results from the impedance of the telephone-set ringers of the two countries.
Ringing Requirements
In Germany, both single-ended ringing and balanced ringing can be used. This is not so in the United States, where some ringers on older equipment have a ground connection at the telephone set, and the signal lead is either the Tip or Ring wire of the twisted pair. This has led to the recommended use of single-ended ringing. Both administrations allow ringing with a negative dc level, known as battery-backed ringing, but in the United States, there is a constraint that this level cannot be more negative than -75 V. With the exception of the United States, most worldwide administrations require an injection of a pure sine wave. Depending on the country, the distortion requirement is in the range of 3% to 5%. In the United States, the wave does not need to resemble a sine wave, but it cannot be a square wave. The shape requirement of the wave in the United States is expressed as a crest factor (c.f.). This is the ratio of the peak to the rms voltage of the signal. The requirement is 1.2 < c.f. < 1.6.
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Lucent Technologies Inc.
Data Sheet June 1998
L7590C Telephone Ringing Driver
Application
RP 20 TIP 250 V PROT RP 20 RING PR L7581 RELAY PT
XMT RCV
DX DR
SLIC
CODEC
RTS1 400 CB 0.1 F
RING TRIP DETECT
VDD
VDD EN
GNDD
CB1
CB2
OUT CLK RILIM PWM SIGNAL
L7590C RINGING GENERATOR
L2 L1 L1 20 mH GNDR CNEG* 1.0 F C1 1.0 F
VREF C2 1 F
VNEG RX 15
VNEG
* CNEG connects to VNEG pin at chip.
12-3058.E (F)
Figure 2. Basic Battery-Backed Ringing Application Table 1. Parts List for Application, Ringing Driver IC Name L1 C1 C2 CB Rx RILIM Value 20 mH 1 F, 250 V, 20% 1 F, 20 V, 20% 0.1 F, 10 V, 20% 15 , 1 W 20 to 100 Function Part of LC output filter Part of LC output filter VREF filter Voltage doubling capacitor Hot insertion limiter Current-limiter adjustment
Lucent Technologies Inc.
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L7590C Telephone Ringing Driver
Data Sheet June 1998
Application (continued)
12-3381 (F) 12-3380 (F)
A. Upper = PWM Signal Centered at 100 kHz Lower = Modulating Signal
B. Same as A but Expanded
Figure 3. Modulation Waveforms
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Lucent Technologies Inc.
Data Sheet June 1998
L7590C Telephone Ringing Driver
Application (continued)
12-3379 (F)
12-3377 (F)
A. Upper = 10% Duty Cycle--CLK Input Lower = L7590C Output
B. 50% Duty Cycle
12-3376 (F)
C. 90% Duty Cycle
Note: For all three illustrations above, the positive portion of the L7590C output is skewed to be greater than the CLK input.
Figure 4. Skewing Illustration Waveforms
Lucent Technologies Inc.
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L7590C Telephone Ringing Driver
Data Sheet June 1998
Application (continued)
HP 3311A HP 8116A
PULSE/FUNCTION GENERATOR 100 kHz RATE SIGNAL GENERATOR 25 Hz
SIGNAL LEVEL = 0 V TO 5 V
+5 V
0.1 F
100 kHz (PWM)
GNDD VDD CB1 CB2 OUT CLK L7590C EN VREF L2 VNEG GNDR CNEG 1.0 F C2 1 F RX VNEG = -170 V L1 20 mH 3.4 F 40 F RILIM C1 1.0 F 450 1386
HP 3585A
SPECTRUM ANALYZER
12-3375.B(F)
Notes: E2 + E3 + E4 + . . . THD % = ---------------------------------------------------------------------------------x 100. 2 2 2 2 E1 + E2 + E3 + E4 + . . . RX = 15 .
2 2 2
Figure 5. L7590C Test Connections
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Lucent Technologies Inc.
Data Sheet June 1998
L7590C Telephone Ringing Driver
Outline Diagram
16-Pin, Plastic SOG
Dimensions are in millimeters.
L N
B
1 PIN #1 IDENTIFIER ZONE W
H SEATING PLANE 0.10 1.27 TYP 0.51 MAX 0.28 MAX
0.61
Number of Pins (N) 16
Maximum Length (L) 10.49
Maximum Width Without Leads (B) 7.62
Maximum Width Including Leads (W) 10.64
Maximum Height Above Board (H) 2.67
5-4414r2 (C)
Lucent Technologies Inc.
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L7590C Telephone Ringing Driver
Data Sheet June 1998
Ordering Information
Device Part No. LUCL7590CAE-D LUCL7590CAE-DT Description Telephone Ringing Driver Telephone Ringing Driver Package 16-Pin SOG 16-Pin SOG (Tape and Reel) Comcode 108191107 108191115
For additional information, contact your Microelectronics Group Account Manager or the following: INTERNET: http://www.lucent.com/micro E-MAIL: docmaster@micro.lucent.com N. AMERICA: Microelectronics Group, Lucent Technologies Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18103 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA PACIFIC: Microelectronics Group, Lucent Technologies Singapore Pte. Ltd., 77 Science Park Drive, #03-18 Cintech III, Singapore 118256 Tel. (65) 778 8833, FAX (65) 777 7495 CHINA: Microelectronics Group, Lucent Technologies (China) Co., Ltd., A-F2, 23/F, Zao Fong Universe Building, 1800 Zhong Shan Xi Road, Shanghai 200233 P. R. China Tel. (86) 21 6440 0468, ext. 316, FAX (86) 21 6440 0652 JAPAN: Microelectronics Group, Lucent Technologies Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagawa-ku, Tokyo 141, Japan Tel. (81) 3 5421 1600, FAX (81) 3 5421 1700 EUROPE: Data Requests: MICROELECTRONICS GROUP DATALINE: Tel. (44) 1189 324 299, FAX (44) 1189 328 148 Technical Inquiries: GERMANY: (49) 89 95086 0 (Munich), UNITED KINGDOM: (44) 1344 865 900 (Bracknell), FRANCE: (33) 1 48 83 68 00 (Paris), SWEDEN: (46) 8 600 7070 (Stockholm), FINLAND: (358) 9 4354 2800 (Helsinki), ITALY: (39) 2 6608131 (Milan), SPAIN: (34) 1 807 1441 (Madrid)
Lucent Technologies Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.
Copyright (c) 1998 Lucent Technologies Inc. All Rights Reserved
June 1998 DS98-340ALC (Replaces DS97-512ALC)

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