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LITELINK(R) III Phone Line Interface IC (DAA)
CPC5620/CPC5621
Features
* Superior voice solution with low noise, excellent part-to-part gain accuracy * 3 kVrms line isolation * Transmit power of up to +10 dBm into 600 * Data access arrangement (DAA) solution for modems at speeds up to V.92 * 3.3 or 5 V power supply operation * Caller ID signal reception function * Easy interface with modem ICs and voice CODECs * Worldwide dial-up telephone network compatibility * CPC5620 and CPC5621 can be used in circuits that comply with the requirements of TIA/EIA/IS-968 (FCC part 68), UL1950, UL60950, EN/IEC 60950-1 Supplementary Isolation compliant, EN55022B, CISPR22B, EN55024, and TBR-21 * Line-side circuit powered from telephone line * Compared to other silicon DAA solutions, LITELINK: - Uses fewer passive components - Takes up less printed-circuit board space - Uses less telephone line power - Offers simplified operation - Is a single-IC solution
Description
LITELINK III is a single-package silicon phone line interface (PLI) DAA used in voice and data communication applications to make connections between low-voltage equipment and high-voltage telephone networks. LITELINK provides a high-voltage isolation barrier, AC and DC phone line terminations, switch hook, 2-wire to 4-wire hybrid, ring detection, and on-hook signal detection. LITELINK can be used in both differential and single-ended signal applications. LITELINK uses on-chip optical components and a few inexpensive external components to form a complete voice or high-speed data phone line interface. LITELINK eliminates the need for large isolation transformers or capacitors used in other interface configurations. It includes the required high-voltage isolation barrier in a surface-mount SOIC package. The CPC5620 (half-wave ringing detect) and CPC5621 (full-wave ringing detect) build upon Clare's LITELINK product line, with improved insertion loss control, improved noise performance, and lower minimum current draw from the phone line. The new mode pin enables worldwide implementation.
Applications
* * * * * * * Computer telephony and gateways, such as VoIP PBXs Satellite and cable set-top boxes V.92 (and other standard) modems Fax machines Voicemail systems Embedded modems for POS terminals, automated banking, remote metering, vending machines, security, and surveillance
Ordering Information
Part Number CPC5620A CPC5620ATR CPC5621A CPC5621ATR Description 32-pin SOIC, half-wave ring detect, 50/Tube 32-pin SOIC, half-wave ring detect, 1000/Reel 32-pin SOIC, full-wave ring detect, 50/Tube 32-pin SOIC, full-wave ring detect, 1000/Reel
Figure 1. CPC5620/CPC5621 Block Diagram
TIP+ Isolation Barrier Transmit Isolation Amplifier Tx+ TxTransmit Diff. Amplifier Transconductance Stage 2-4 Wire Hybrid AC/DC Termination Hookswitch VI Slope Control AC Impedance Control Current Limit Control
MODE OH Vref Gain Trim Vref Gain Trim Receive Isolation Amplifier Rx+ RxReceive Diff. Amplifier CID/ RING MUX CSNOOP Snoop Amplifier CSNOOP RSNOOP RSNOOP
Isolation
3kVrms
RING CID
RING-
Pb
RoHS
2002/95/EC
e3
DS-CPC5620/CPC5621 - R04
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CPC5620/CPC5621
1 Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Absolute Maximum Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Application Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1 Resistive Termination Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1.1 Resistive Termination Application Circuit Part List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1.2 Reactive Termination Application Circuit Part List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Using LITELINK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1 Switch Hook Control (On-hook and Off-hook States) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 On-hook Operation: OH=1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.1 Ringing Signal Reception via the Snoop Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.2 Polarity Reversal Detection with CPC5621 in On-hook State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.3 On-hook Caller ID Signal Reception . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3 Off-Hook Operation: OH=0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3.1 Receive Signal Path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3.2 Transmit Signal Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4 Start-up Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 DC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5.1 Setting a Current Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6 AC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6.1 Resistive Termination Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6.2 Reactive Termination Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6.3 Mode Pin Usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 3 4 5 6 6 7 9
10 10 10 10 11 11 11 11 12 12 12 13 13 13 13 13
4 Regulatory Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5 LITELINK Design Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6 LITELINK Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 Manufacturing Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1 Mechanical Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 Tape and Reel Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3 Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3.1 Moisture Reflow Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3.2 Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4 Washing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 16 17 17 17 17 17
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CPC5620/CPC5621
1. Electrical Specifications
1.1 Absolute Maximum Ratings
Parameter VDD Logic Inputs Continuous Tip to Ring Current (RZDC = 5.2) Total Package Power Dissipation Isolation Voltage Operating temperature Storage temperature Minimum Maximum -0.3 -0.3 -40 -40 6 VDD + 0.3 150 1 3000 +85 +125 Unit V V mA W Vrms C C
Absolute maximum ratings are stress ratings. Stresses in excess of these ratings can cause permanent damage to the device. Functional operation of the device at conditions beyond those indicated in the operational sections of this data sheet is not implied.
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CPC5620/CPC5621 1.2 Performance
Parameter DC Characteristics Operating Voltage VDD Operating Current IDD Operating Voltage VDDL Operating Current IDDL On-hook Characteristics Metallic DC Resistance Longitudinal DC Resistance Ringing Signal Detect Level Ringing Signal Detect Level Snoop Circuit Frequency Response Snoop Circuit CMRR 1 Ringer Equivalence Longitudinal Balance 1 Off-Hook Characteristics AC Impedance Longitudinal Balance Return Loss Transmit and Receive Characteristics Frequency Response Transhybrid Loss 40 30 600 26 36 4000 dB dB Hz dB Tip to ring, using resistive termination application circuit Per FCC part 68 Into 600 at 1800 Hz -3 dB corner frequency 30 Hz Into 600 at 1800 Hz, with C18 in the resistive termination application circuit 30 Hz to 4 kHz, for resistive termination application circuit with MODE de-asserted and for reactive termination application circuit with MODE asserted. 4 kHz flat bandwidth -3 dBm, 600 Hz, 2nd harmonic Single-tone sine wave. Or 0 dBm into 600 Single-tone sine wave. Or 0 dBm into 600 Sink and source Minimum 3.0 2.8 10 10 5 28 166 60 Typical 9 7 40 0.1B Maximum 5.50 13 3.2 8 >4000 Unit V mA V mA M M Vrms Vrms Hz dB REN dB Conditions Low-voltage side Low-voltage side Line side, derived from tip and ring Line side, drawn from tip and ring while off-hook Tip to ring, 100 VDC applied 150 VDC applied from tip and ring to Earth ground 68 Hz ring signal applied tip to ring 15 Hz ring signal applied tip to ring -3 dB corner frequency @ 166 Hz, in Clare application circuit 120 Vrms 60 Hz common-mode signal across tip and ring Per FCC part 68
Transmit and Receive Insertion Loss
-0.4
0 -126 -80 90 -
0.4 2.2 2.2 0.5 120 0.8 -120 -120 0.4
dB dBm/Hz dB VP-P VP-P mA k Vrms V/S VIL VIH A A V V
Average In-band Noise Harmonic Distortion Transmit Level Receive Level RX+/RX- Output Drive Current TX+/TX- Input Impedance 60 Isolation Characteristics Isolation Voltage 3000 Surge Rise Time 2000 MODE, OH, and CID Control Logic Inputs Input Low Voltage Input High Voltage 2.0 High Level Input Current Low Level Input Current RING Output Logic Levels Output High Voltage Output Low Voltage VDD -0.4 -
Line side to low-voltage side, one minute duration No damage via tip and ring
VIN VDD VIN = GND IOUT = -400 A IOUT = 1 mA
Specifications subject to change without notice. All performance characteristics based on the use of Clare application circuits. Functional operation of the device at conditions beyond those specified here is not implied. All specifications at 25C and VDD = 5V unless otherwise noted. 1) This parameter is layout and component tolerance dependent.
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CPC5620/CPC5621 1.3 Pin Description
Pin 1 2 3 4 5 6 7 8 9 Name VDD TXSM TXTX+ TX MODE GND OH RING Function Low-voltage (CPE) side power supply Transmit summing junction Negative differential transmit signal to DAA from low-voltage side Positive differential transmit signal to DAA from low-voltage side Transmit differential amplifier output When asserted low, changes gain of TX path (-7 dB) and RX path (+7 dB) to accommodate reactive termination networks Low-voltage (CPE) side analog ground Assert logic low for off-hook operation Ringing Detect Output Assert logic low while on hook to allow CID information to be passed to the RX+ and RXoutput pins. Negative differential analog signal received from the telephone line. Must be AC coupled with 0.1 F. Positive differential analog signal received from the telephone line. Must be AC coupled with 0.1 F. Positive differential snoop input Negative differential snoop input Receive photodiode amplifier output Receive photodiode summing junction Power supply for line side, regulated from tip and ring. Receive isolation amp summing junction Receive LED pre-bias current set Bridge rectifier return Electronic inductor DCR/current limit DC feedback output V to I slope control Network amplifier feedback External MOSFET gate control Receive signal input Bridge rectifier return Transmit photodiode summing junction Receiver impedance set Transmit transconductance gain set Transmit photodiode amplifier output 1.25 VDC reference Figure 2. Pinout
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 VDD TXSM TXTX+ TX MODE GND OH RING CID RXRX+ SNP+ SNPRXF RX REFL TXF ZTX ZNT TXSL BRNTS GAT NTF DCS1 DCS2 ZDC BRRPB RXS VDDL 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
10 CID
11 RX-
12 RX+ 13 SNP+ 14 SNP15 RXF 16 RX 17 VDDL 18 RXS 19 RPB 20 BR21 ZDC 22 DCS2 23 DCS1 24 NTF 25 GAT 26 NTS 27 BR28 TXSL 29 ZNT 30 ZTX 31 TXF 32 REFL
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CPC5620/CPC5621
2. Application Circuits
LITELINK can be used with telephone networks worldwide. Some public telephone networks, notably in North America and Japan require resistive line termination. Other telephone networks, as in Europe and elsewhere, require a reactive line termination. The application circuits below address both line termination models. The reactive termination application circuit (see Figure 4 on page 8) describes the TBR-21 implementation. This circuit can be adapted easily for other reactive termination needs.
2.1 Resistive Termination Application Circuit
Figure 3. Resistive Termination Application Circuit Schematic
3.3 or 5V
R23 2 10 C16 10
A
C1 1
FB1 600 200 mA
A
U1 R1 (RTX) 80.6K C13 C2 0.1 0.1 1 VDD 2 TXSM 3 TX4 TX+ 5 TX 6 MODE
A
LITELINK
REFL 32 TXF ZTX ZNT TXSL BR31 30 29 28 27
C9 0.1
BR-
TXTX+
R5 (RTXF) 60.4K
BR-
R75 (RNTX) 261K
7 GND 8 OH 9 RING 10 CID
NTS 26 GAT 25 NTF 24 R12 (RNTF) 499K R15 (RDCS2) 1.69M R16 (R 3 ZDC) 8.2
BRR76 (RHTF) 200K R8 221K (RHTX)
C10 0.01 500V R13 (RNTS) 1M
R22 (RDCS1A) 6.49 M R21 (RDCS1B) 6.49M C12 (CDCS) 0.027
BR-
OH RING CID RXRX+ C14 C4
R14 (RGAT) 47 5%
Q1 CPC5602C C15 0.01 500V BR-
C21 100p BR- (CGAT)
DCS1 23 DCS2 22
0.1 11 RX0.1 12 RX+ 13 SNP+ 14 SNP15 RXF 16 RX R2 (RRXF) 130K
ZDC 21 BR- 20 RPB RXS VDDL 17 19 18
R20 (RVDDL) 2 5% +
DB1 TIP
R18 (RZTX) 3.32K
BRBR-
R4 (RPB) 68.1
BR-
C18 15p 3 R10 (RZNT) 301
BR-
SP1 1 RING
C7 (CSNP-) 4 220pF R3 (RSNPD) 1.5M C8 (CSNP+) 4 220pF
R6 (RSNP-2) 1.8M R7
R44 (RSNP-1) 1.8M R45 (RSNP+1) 1.8M NOTE: Unless otherwise noted: Resistor values are in Ohms All resistors are 1%. Capacitor values are in Farads.
(RSNP+2) 1.8M
This design was tested and found to comply with FCC Part 68 with this Sidactor. Other compliance requirements may require a different part. Higher-noise power supplies may require substitution of a 220 H inductor, Toko 380HB-2215 or similar. See the Power Quality section of Clare application note AN-146, Guidelines for Effective LITELINK Designs for more information. Optional for enhanced transhybrid loss.
4Use
voltage ratings based on the isolation requirements of your application.
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CPC5620/CPC5621
2.1.1 Resistive Termination Application Circuit Part List
Quantity 1 5 2 2 1 1 1 1 1 1 1 1 1 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 2
Reference Designator C1 C2, C4, C9, C13, C14 C7, C8 1 C10, C15 C12 C16 C18 (optional) C21 R1 R2 R3 R4 R5 R6, R7, R44, R45 2 R8 R10 R12 R13 R14 R15 R16 R18 R20 R21, R22 R23 R75 R76 FB1 DB1 SP1 Q1 U1
Description 1 F, 16 V, 10% 0.1 F, 16 V, 10% 220 pF, 5% 0.01 F, 500 V, 10% 0.027 F, 16 V, 10% 10 F, 16 V, 10% 15 pF, 16 V, 10% 100 pF, 16 V, 10% 80.6 k, 1/16 W, 1% 130 k, 1/16 W, 1% 1.5 M, 1/16 W, 1% 68.1 , 1/16 W, 1% 60.4 k, 1/16 W, 1% 1.8 M, 1/10 W, 1%
Supplier(s)
AVX, Murata, Novacap, Panasonic, SMEC, Tecate, etc.
221 k, 1/16 W, 1% 301 , 1/16 W, 1% 499 k, 1/16 W, 1% Panasonic, Electro Films, FMI, Vishay, 1 M, 1/16 W, 1% etc. 47 , 1/16 W, 5% 1.69 M, 1/16 W, 1% 8.2 , 1/8 W, 1% 3.32 k, 1/16 W, 1% 2 , 1/16 W, 5% 6.49 M, 1/16 W, 1% 10 , 1/16 W, 5%, or 220 H inductor 261 k, 1/16 W, 1% 200 k, 1/16 W, 1% 600 , 200 mA ferrite bead Murata BLM11A601S or similar S1ZB60 bridge rectifier Shindengen, Diodes, Inc. Bourns (TISP4350H3) or 350 V Teccor (P3100SC) CPC5602 FET Clare CPC5620/CPC5621 LITELINK
Use voltage ratings based on the isolation requirements of your application. Typical applications will require 2kV to safely hold off the isolation voltage. Use components that allow enough space to account for the possibility of high-voltage arcing.
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CPC5620/CPC5621
Figure 4. Reactive Termination Application Circuit Schematic
3.3 or 5V
R23 2 10 C16 10
A
C1 1
FB1 600 200 mA
A
U1 R1 (RTX) 80.6K C13 C2 0.1 0.1 1 VDD 2 TXSM 3 TX4 TX+ 5 TX 6 MODE
A
LITELINK
REFL 32 TXF ZTX ZNT TXSL BR31 30 29 28 27
C9 0.1
BR-
TXTX+
R5 (RTXF) 60.4K
BR-
R75 (RNTX) 110K
7 GND 8 OH 9 RING 10 CID
NTS 26 GAT 25 NTF 24 R12 (RNTF) 221K R15 (RDCS2) 1.69M R16 (R 3 ZDC) 8.2 R76 (RHTF) 200K R8 (RHTX) 200K R4 (RPB) 68.1
BRBR-
C10 0.01 500V R13 (RNTS) 1M
R22 (RDCS1A) 6.49M R21 (RDCS1B) 6.49M C12 (CDCS) 0.027
BR-
OH RING CID RXRX+ C14 C4
R14 (RGAT) 47 5%
Q1 CPC5602C C15 0.01 500V BR-
C21 100p BR- (CGAT)
DCS1 23 DCS2 22
0.1 11 RX0.1 12 RX+ 13 SNP+ 14 SNP15 RXF 16 RX R2 (RRXF) 130K
ZDC 21 BR- 20 RPB RXS VDDL 17 19 18
R20 (RVDDL) 2 5% +
DB1 TIP
R18 (RZTX) 10K
BRBR-
R10 59 (RZNT1) C20 (CZNT) 0.68
BR-
SP1 1 RING
R11 169 (RZNT2)
C7 (CSNP-) 4 220p R3 (RSNPD) 1.5M C8 (CSNP+) 4 220p
R6 (RSNP-2) 1.8M R7
R44 (RSNP-1) 1.8M R45 (RSNP+1) 1.8M NOTE: Unless otherwise noted: Resistor values are in Ohms All resistors are 1%. Capacitor values are in Farads.
(RSNP+2) 1.8M
This design was tested and found to comply with FCC Part 68 with this Sidactor. Other compliance requirements may require a different part. Higher-noise power supplies may require substitution of a 220 H inductor, Toko 380HB-2215 or similar. See the Power Quality section of Clare application note AN-146, Guidelines for Effective LITELINK Designs for more information.
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RZDC sets the loop-current limit, see "Setting a Current Limit" on page 13. Also see Clare's application note AN-146 for heat sinking recommendations for the CPC5602C FET. Use voltage ratings based on the isolation requirements of your application.
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CPC5620/CPC5621
2.1.2 Reactive Termination Application Circuit Part List
Quantity 1 5 2 2 1 1 1 1 1 1 1 1 1 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
1 2
Reference Designator C1 C2, C4, C9, C13, C14 C7, C8 1 C10, C15 C12 C16 C20 C21 R1 R2 R3 R4 R5 R6, R7, R44, R45 2 R8 R10 R11 R12 R13 R14 R15 R16 R18 R20 R21, R22 R23 R75 R76 FB1 DB1 SP1 Q1 U1
Description 1 F, 16 V, 10% 0.1 F, 16 V, 10% 220 pF, 5% 0.01 F, 500 V, 10% 0.027 F, 16 V, 10% 10 F, 16 V, 10% 0.68 F, 16 V, 10% 100 pF, 16 V, 10% 80.6 k, 1/16 W, 1% 130 k, 1/16 W, 1% 1.5 M, 1/16 W, 1% 68.1 , 1/16 W, 1% 60.4 k, 1/16 W, 1% 1.8 M, 1/10 W, 1% 200 k, 1/16 W, 1% 59 , 1/16 W, 1% 169 , 1/16 W, 1% 221 k, 1/16 W, 1% 1 M, 1/16 W, 1% 47 , 1/16 W, 5% 1.69 M, 1/16 W, 1% 8.2 , 1/8 W, 1% 10 k, 1/16 W, 1% 2 , 1/16 W, 5% 6.49 M, 1/16 W, 1% 10 , 1/16 W, 5%, or 220 H inductor 110 k, 1/16 W, 1% 200 k, 1/16 W, 1% 600 , 200 mA ferrite bead S1ZB60 bridge rectifier 350 V CPC5602 FET CPC5620/CPC5621 LITELINK
Supplier
AVX, Murata, Novacap, Panasonic, SMEC, Tecate, etc.
Panasonic, Electro Films, FMI, Vishay, etc.
Murata BLM11A601S or similar Shindengen, Diodes, Inc. Bourns (TISP4350H3) or Teccor (P3100SC) Clare
Use voltage ratings based on the isolation requirements of your application. Typical applications will require 2kV to safely hold off the isolation voltage. Use components that allow enough space to account for the possibility of high-voltage arcing.
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CPC5620/CPC5621
3. Using LITELINK
As a full-featured telephone line interface, LITELINK performs the following functions: * * * * * * * DC termination and V/I slope control AC impedance control 2-wire to 4-wire conversion (hybrid) Current limiting Ringing signal reception Caller ID signaling reception Switch hook from Tip and Ring to the RX+ and RX- outputs and the ringing detect function. Setting CID to a logic low enables the CID path while placing CID to a logic high configures the LITELINK to detect ringing. Asserting OH low causes LITELINK to answer or originate a call by entering the off-hook state. In the off-hook state, loop current flows through LITELINK.
LITELINK can accommodate specific application features without sacrificing basic functionality and performance. Application features include, but are not limited to: * * * * * * * * High transmit power operation Pulse dialing Ground start Loop start Parallel telephone off-hook detection (line intrusion) Battery reversal detection Line presence detection World-wide programmable operation
3.2 On-hook Operation: OH=1
The LITELINK application circuit leakage current is less than 10 A with 100 V across ring and tip, equivalent to greater than 10 M on-hook resistance.
3.2.1 Ringing Signal Reception via the Snoop Circuit
In the on-hook state (OH and CID not asserted), an internal multiplexer turns on the snoop circuit. This circuit monitors the telephone line for two conditions; an incoming ring signal, and caller ID data bursts. Refer to the application schematic diagram (see Figure 3. on page 6). C7 (CSNP-) and C8 (CSNP+) provide a high-voltage isolation barrier between the telephone line and SNP- and SNP+ on the LITELINK while coupling AC signals to the snoop amplifier. The snoop circuit "snoops" the telephone line continuously while drawing no current. In the LITELINK, ringing signals are compared to a threshold. The comparator output forms the RING signal output from LITELINK. This signal must be qualified by the host system as a valid ringing signal. A low level on RING indicates that the LITELINK ring signal threshold has been exceeded. For the CPC5620 (with the half-wave ring detector), the frequency of the RING output follows the frequency of the ringing signal from the central office (CO), typically 20 Hz. The RING output of the CPC5621 (with the full-wave ring detector) is twice the ringing signal frequency. Hysteresis is employed in the LITELINK ring detector circuit to provide noise immunity. The set-up of the ring detector comparator causes RING output pulses to remain low for most of the ringing signal half-cycle. The RING output returns high for the entire negative half-cycle of the ringing signal for the CPC5620. For the CPC5621, the RING output returns high for a short period near the zero-crossing of the ringing signal before returning low during the positive half-cycle. For both the CPC5620 and CPC5621, the RING output remains high between ringing signal bursts.
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This section of the data sheet describes LITELINK operation in standard configuration for usual operation. Clare offers additional application information on-line (see Section 5 on page 13). These include information on the following topics: * * * * * * Circuit isolation considerations Optimizing LITELINK performance Data Access Arrangement architecture LITELINK circuit descriptions Surge protection EMI considerations
Other specific application materials are also referenced in this section as appropriate.
3.1 Switch Hook Control (On-hook and Off-hook States)
LITELINK operates in one of two conditions, on-hook and off-hook. In the on-hook condition the telephone line is available for calls. In the off-hook condition the telephone line is engaged. The OH control input is used to place LITELINK in one of these two states. With OH high, LITELINK is on-hook and ready to make or receive a call. While on-hook, the CID control is used to select between passing the caller-ID tones
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The ringing detection threshold depends on the values of R3 (RSNPD), R6 & R44 (RSNP-), R7 & R45 (RSNP+), C7 (CSNP-), and C8 (CSNP+). The value of these components shown in the application circuits are recommended for typical operation. The ringing detection threshold can be changed according to the following formula:
750mV V RINGPK = ---------------- R SNPD ( R SNP
2 1 + R SNPD ) + ------------------------------------2 ( f RING C SNP )
4. De-assert CID (high or floating). Note: Taking LITELINK off-hook (via the OH pin) disconnects the snoop path from both the receive outputs and the RING output, regardless of the state of the CID pin. CID gain from tip and ring to RX+ and RX- is determined by:
TOTAL
Where: * RSNPD = R3 in the application circuits shown in this data sheet. * RSNPTOTAL = the total of R6, R7, R44, and R45 in the application circuits shown in this data sheet. * CSNP = C7 = C8 in the application circuits shown in this data sheet. * And RING is the frequency of the ringing signal. Clare Application Note AN-117 Customize Caller ID Gain and Ring Detect Voltage Threshold is a spreadsheet for trying different component values in this circuit. Changing the ringing detection threshold will also change the caller ID gain and the timing of the polarity reversal detection pulse, if used.
6R SNPD GAIN CID ( dB ) = 20 log -----------------------------------------------------------------------------------------------2 1 ( R SNP + R SNPD ) + ------------------------2 TOTAL ( fC SNP )
Where: * RSNPD = R3 in the application circuits in this data sheet * RSNPTOTAL = the total of R6, R7, R44, and R45 in the application circuits in this data sheet * CSNP = C7 = C8 in the application circuits in this data sheet * and where is the frequency of the CID signal The recommended components in the application circuit yield a gain 0.27 dB at 2000 Hz. Clare Application Note AN-117 Customize Caller ID Gain and Ring Detect Voltage Threshold is a spreadsheet for trying different component values in this circuit. Changing the CID gain will also change the ring detection threshold and the timing of the polarity reversal detection pulse, if used. For single-ended receive applications where only one RX output is used, the snoop circuit gain can be adjusted back to 0 dB by changing the value of the snoop series resistors R6, R7, R44 and R45 from 1.8M to 715k. This change results in negligible modification to the ringing detect threshold.
3.2.2 Polarity Reversal Detection with CPC5621 in On-hook State
The full-wave ringing detector in the CPC5621 makes it possible to detect on-hook tip and ring polarity reversal using the RING output. When the polarity of tip and ring reverses, a pulse on RING indicates the event. Your system logic must be able to discriminate this single pulse of approximately 1 msec (using the recommended snoop circuit external components) from a valid ringing signal.
3.2.3 On-hook Caller ID Signal Reception
On-hook caller ID (CID) signals are processed by LITELINK by coupling the CID data burst through the snoop circuit to the LITELINK RX outputs under control of the CID pin. In North America, CID data signals are typically sent between the first and second ringing signal. In North American applications, follow these steps to receive on-hook caller ID data via the LITELINK RX outputs: 1. Detect the first ringing signal outputs on RING. 2. Assert CID low. 3. Process the CID data from the RX outputs.
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3.3 Off-Hook Operation: OH=0
3.3.1 Receive Signal Path
Signals to and from the telephone network appear on the tip and ring connections of the application circuit. Receive signals are extracted from transmit signals by the LITELINK two-wire to four-wire hybrid. Next, the receive signal is converted to infrared light by the receive photodiode amplifier and receive path LED. The intensity of the light is modulated by the receive
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CPC5620/CPC5621
signal and coupled across the electrical isolation barrier by a reflective dome. On the equipment's low voltage side of the barrier, the receive signal is converted by a photodiode into a photocurrent. The photocurrent, a linear representation of the receive signal, is amplified and converted to a differential voltage output on RX+ and RX-. Variations in gain are controlled to within 0.4 dB by factory gain trim, which sets the output to unity gain. To accommodate single-supply operation, LITELINK includes a small DC bias on the RX outputs of 1.0VDC. Most applications should AC couple the RX outputs as shown in Figure 5. LITELINK may be used for differential or single-ended output as shown in Figure 5. Single-ended use will produce 6 dB less signal output amplitude. Do not exceed 0 dBm into 600 (2.2 VP-P) signal input with the standard application circuit. See application note AN-157, Increased LITELINK III Transmit Power for more information. The output of the photodiode amplifier is coupled to a voltage-to-current converter via a transconductance stage where the transmit signal modulates the telephone line loop current. As in the receive path, gain is set to unity at the factory, limiting insertion loss variation to 0.4 dB. Differential and single-ended transmit signals into LITELINK should not exceed a signal level of 0 dBm referenced to 600 (or 2.2 VP-P). For output power levels above 0dBm consult the application note AN-157, Increased LITELINK III Transmit Power for more information.
Figure 6. Differential and Single-ended Transmit Path Connections to LITELINK
Low-Voltage Side CODEC or Transmit Circuit LITELINK
0.1f
TXTX+
TXA1
0.1f
+
TXA2
Low-Voltage Side CODEC or Transmit Circuit
LITELINK
Figure 5. Differential and Single-ended Receive Path Connections to LITELINK
Low-Voltage Side CODEC or Voice Circuit
RX+ RX0.1F 0.1F RX-
LITELINK
0.1f
TXA1
0.1f
TXTX+
+
RX+
3.4 Start-up Requirements
RX 0.1F RX+
OH must be de-asserted (set logic high) once after power-up for at least 50ms to transfer internal gain trim values within LITELINK. This would be normal operation in most applications. Failure to comply with this requirement will result in transmission gain errors and possibly distortion.
3.3.2 Transmit Signal Path
Connect transmit signals from the low-voltage side equipment to the TX+ and TX- pins of LITELINK. Do not exceed a signal level of 0 dBm in 600 (or 2.2 VP-P). Differential transmit signals are converted to single-ended signals in LITELINK. The signal is coupled to the transmit photodiode amplifier in a similar manner to the receive path. See application note AN-157, Increased LITELINK III Transmit Power for more information.
3.5 DC Characteristics
The CPC5620 and CPC5621 are designed for worldwide application, including use under the requirements of TBR-21. The ZDC, DCS1, and DCS2 pins control the VI slope characteristics of LITELINK. Selecting appropriate resistor values for RZDC (R16) and RDCS (R15) in the provided application circuits assure compliance with DC requirements.
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3.5.1 Setting a Current Limit
LITELINK includes a telephone line current limit feature that is selectable by choosing the desired value for RZDC (R16) using the following formula:
1V I CL Amps = ------------ + 0.008A R ZDC
Insertion loss with MODE de-asserted and the resistive termination application circuit is 0 dB. Insertion loss with the reactive termination application circuit and MODE asserted is also 0 dB.
4. Regulatory Information
LITELINK III can be used to build products that comply with the requirements of TIA/EIA/IS-968 (formerly FCC part 68), FCC part 15B, TBR-21, EN60950, UL1950, EN55022B, IEC950/IEC60950, CISPR22B, EN55024, and many other standards. LITELINK provides supplementary isolation. Metallic surge requirements are met through the inclusion of a Sidactor in the application circuit. Longitudinal surge protection is provided by LITELINK's optical barrier technology and the use of high-voltage components in the application circuit as needed. The information provided in this document is intended to inform the equipment designer but it is not sufficient to assure proper system design or regulatory compliance. Since it is the equipment manufacturer's responsibility to have their equipment properly designed to conform to all relevant regulations, designers using LITELINK are advised to carefully verify that their end-product design complies with all applicable safety, EMC, and other relevant standards and regulations. Semiconductor components are not rated to withstand electrical overstress or electro-static discharges resulting from inadequate protection measures at the board or system level.
Clare recommends using 8.2 for RZDC for most applications, limiting telephone line current to 130 mA. Whether using the recommended value above or when setting RZDC higher for a lower loop current limit refer to the guidelines for FET thermal management provided in AN-146, Guidelines for Effective LITELINK Designs.
3.6 AC Characteristics
3.6.1 Resistive Termination Applications
North American and Japanese telephone line AC termination requirements are met with a resistive 600 AC termination. Receive termination is applied to the LITELINK ZNT pin (pin 29) as a 301 resistor, RZNT (R10).
3.6.2 Reactive Termination Applications
Many countries use a single-pole complex impedance to model the telephone network transmission line characteristic impedance as shown in the table below. Line Impedance Model Australia
RS
China 200 680 100 nF
TBR 21 270 750 150 nF
5. LITELINK Design Resources
The Clare, Inc. web site has a wealth of information useful for designing with LITELINK, including application notes and reference designs that already meet all applicable regulatory requirements. See the following links: LITELINK datasheets and reference designs Application note AN-117 Customize Caller ID Gain and Ring Detect Voltage Threshold Application note AN-146, Guidelines for Effective LITELINK Designs Application note AN-152 LITELINK II to LITELINK III Design Conversion Application note AN-155 Understanding LITELINK Display Feature Signal Routing and Applications
RS RP
CP
220 820 120 nF
RP
CP
Proper gain and termination impedance circuits for a complex impedance requires the use of complex network on ZNT as shown in the "Reactive Termination Application Circuit Schematic" on page 8.
3.6.3 Mode Pin Usage
Assert the MODE pin low to introduce a 7 dB pad into the transmit path and add 7 dB of gain to the receive path. These changes compensate for the gain changes made to the transmit and receive paths in reactive termination implementations.
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CPC5620/CPC5621
6. LITELINK Performance
The following graphs show LITELINK performance using the North American application circuit shown in this data sheet.
Figure 7. Receive Frequency Response at RX
2 0
Figure 10.Transmit THD on Tip and Ring
0
-20
-2
-40
-4
Gain -6 dBm
-8
-60 THD+N dB -80
-10
-100
-12
-120
-14 0 500 1000 1500 2000 2500 3000 3500 4000
-140 0 500 1000 1500 2000 Frequency 2500 3000 3500 4000
Frequency
Figure 8. Transmit Frequency Response at TX
2
Figure 11.Transhybrid Loss
0 -5
0
-2
-10
-15
-4
Gain dBm
-6
THL -20 dB
-25
-8
-30
-10
-35
-12 0 500 1000 1500 2000 2500 3000 3500 4000
-40 0 500 1000 1500 2000 2500 3000 3500 4000
Frequency
Frequency
Figure 9. Receive THD on RX
0
Figure 12.Return Loss
60
-20
55
-40
50
-60 THD+N dB -80
Return Loss 45 (dB)
-100
40
-120
35
-140 0 500 1000 1500 2000 Frequency 2500 3000 3500 4000
30 0 500 1000 1500 2000 Frequency (Hz) 2500 3000 3500 4000
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CPC5620/CPC5621
Figure 13.Snoop Circuit Frequency Response
5
0
-5
Gain (dBm ) -10
-15
-20
-25 0 500 1000 1500 2000 2500 3000 3500 4000 Frequency (Hz)
Figure 14.Snoop Circuit THD + N
500
1K
1.5K
2K
2.5K
3K
3.5K
4K
Hz
Figure 15.Snoop Circuit Common Mode Rejection
+0 -2.5 -5 -7.5 -10 -12.5 -15 -17.5 -20 -22.5 -25 -27.5 CMRR -30 (dBm) -32.5 -35 -37.5 -40 -42.5 -45 -47.5 -50 -52.5 -55 -57.5 -60 20 50 100 200 Frequency (Hz) 500 1K 2K 4K
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7. Manufacturing Information
7.1 Mechanical Dimensions
Figure 16. Dimensions
10.287 .254 (0.405 0.010)
7.493 0.127 10.363 0.127 (0.295 0.005) (0.408 0.005)
7.239 0.051 (0.285 0.002) 1.016 Typ. (0.040 Typ.)
0.635 0.076 (0.025 0.003) 1.981 0.051 (0.078 0.002) 2.134 Max (0.084 Typ.) 0.330 0.051 (0.013 0.002) 9.525 0.076 (0.375 0.003)
0.635 x 45o (0.025 x 45o)
0.203 (0.008)
A Coplanar to A 0.08/(0.003) 32 PL.
MIN 0, MAX 0.102 (MIN 0, MAX 0.004)
Figure 17. Recommended Printed Circuit Board Layout
1.90 (0.0748)
0.635 (0.025)
0.40 (0.0157)
9.30 (0.366) Dimensions mm (inches)
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CPC5620/CPC5621 7.2 Tape and Reel Packaging
Figure 18. Tape and Reel Dimensions
Tape and Reel Packaging for 32-Pin SOIC Package
330.2 Dia (13.00 Dia) Top Cover Tape Thickness 0.102 Max (0.004 Max) Top Cover Tape P=12.00 (0.472) A0=10.90 0.15 (0.429 0.006) Dimensions mm (inches) B0=10.70 0.15 (0.421 0.006)
W=16.00 0.30 (0.630 0.012)
K0=3.20 0.15 (0.126 0.006) K1=2.70 0.15 (0.106 0.006)
Embossed Carrier
User Direction of Feed
Embossment
NOTE: Tape dimensions not shown comply with JEDEC Standard EIA-481-2
7.3 Soldering
7.3.1 Moisture Reflow Sensitivity
Clare has characterized the moisture reflow sensitivity of this package, and has determined that this component must be handled in accordance with IPC/JEDEC standard J-STD-033 moisture sensitivity level (MSL), level 3 classification.
recommended guidelines may cause permanent damage to the device resulting in impaired performance and/or a reduced lifetime expectancy.
7.4 Washing
Clare does not recommend ultrasonic cleaning or the use of chlorinated solvents.
7.3.2 Reflow Profile
For proper assembly, the component must be processed in accordance with the current revision of IPC/JEDEC standard J-STD-020. Failure to follow the
Pb
RoHS
2002/95/EC
e3
For additional information please visit www.clare.com
Clare, Inc. makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifications and product descriptions at any time without notice. Neither circuit patent licenses or indemnity are expressed or implied. Except as set forth in Clare's Standard Terms and Conditions of Sale, Clare, Inc. assumes no liability whatsoever, and disclaims any express or implied warranty relating to its products, including, but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement of any intellectual property right. The products described in this document are not designed, intended, authorized, or warranted for use as components in systems intended for surgical implant into the body, or in other applications intended to support or sustain life, or where malfunction of Clare's product may result in direct physical harm, injury, or death to a person or severe property or environmental damage. Clare, Inc. reserves the right to discontinue or make changes to its products at any time without notice. Specification: DS-CPC5620/CPC5621 - R04 Copyright (c) 2008, Clare, Inc. LITELINK(R) is a registered trademark of Clare, Inc. All rights reserved. Printed in USA. 10/10/08
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