Am79467 Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS Optimized for long-loop operation Programmable constant-current feed Programmable loop-current detector Programmable ground-key detector Low standby power On-hook transmission -24 V to -58 V battery operation On-chip relay driver Two-wire impedance set by single external impedance BLOCK DIAGRAM Ring Relay Driver RINGOUT C1 A(TIP) C2 Input Decoder and Control E0 Ground-Key Detector HPA HPB E1 Two-Wire Interface DET VTX Signal Transmission RSN Off-Hook Detector RD B(RING) DA DB Power-Feed Controller RDC CAS Ring-Trip Detector VBAT BGND VCC VEE AGND/DGND Publication# 080144 Rev: D Amendment: /0 Issue Date: October 1999 ORDERING INFORMATION Standard Products Legerity standard products are available in several packages and operating ranges. The order number (Valid Combination) is formed by a combination of the elements below. Am79467 -1 J C OPERATING CONDITIONS C = Commercial (0C to 70C)* PACKAGE TYPE J = 28-Pin Plastic Leaded Chip Carrier (PL 028) PERFORMANCE GRADE -1 = 52 dB Long. Balance -2 = 63 dB Long. Balance DEVICE NUMBER/DESCRIPTION Am79467 Subscriber Line Interface Circuit Valid Combinations Valid Combinations Am79467 -1 -2 JC Valid Combinations list configurations planned to be supported in volume for this device. Consult the local Legerity sales office to confirm availability of specific valid combinations, to check on newly released combinations, and to obtain additional data on Leger ity 's standard militar y-grade products. Note: * Functionality of the device from 0C to +70C is guaranteed by production testing. Performance from -40C to +85C is guaranteed by characterization and periodic sampling of production units. 2 Am79467 Data Sheet CONNECTION DIAGRAMS Top View VCC NC BGND NC B(RING) A(TIP) NC 28-Pin PLCC 4 3 2 1 28 27 26 NC CAS 7 23 DA E1 8 22 RD E0 9 21 HPA NC 10 20 HPB DET 11 19 VTX C2 12 13 14 15 16 17 18 VEE 24 NC 6 RSN VBAT AGND DB RDC 25 C1 RINGOUT 5 Notes: 1. Pin 1 is marked for orientation. 2. NC = No connect SLIC Products 3 PIN DESCRIPTIONS 4 Pin Names Type Description AGND/DGND Ground Analog and digital ground. A(TIP) Output Output of A(TIP) power amplifier. BGND Ground Battery (power) ground. B(RING) Output Output of B(RING) power amplifier. C2-C1 Input CAS Capacitor DA Input Ring-Trip negative. Negative input to ring-trip comparator. DB Input Ring-Trip positive. Positive input to ring-trip comparator. DET Output E0 Input DET enable. A logic High disables DET. A logic Low enables DET. E1 Input Ground-key enable. A logic High connects the off-hook/ring-trip detector to DET, and a logic Low connects the ground-key/ring-trip detector to DET. HPA Capacitor High-pass filter capacitor. A(TIP) side of high-pass filter capacitor. HPB Capacitor High-pass filter capacitor. B(RING) side of high-pass filter capacitor. NC -- RD Resistor Detect resistor. Detector threshold set and filter pin. RDC Resistor DC feed resistor. Connection point for the DC feed current programming network. The other end of the network connects to the receiver summing node (RSN). VRDC is negative for normal polarity and positive for reverse polarity. RINGOUT Output RSN Input VBAT Battery Battery supply. VCC Power +5 V power supply. VEE Power -5 V power supply. VTX Output Transmit audio. This output is a unity gain version of the A(TIP) and B(RING) metallic voltage. VTX also sources the two-wire input impedance programming network. Decoder. SLIC control pins. C2 is MSB and C1 is LSB. TTL compatible. Anti-saturation capacitor pin for capacitor to filter reference voltage when operating in anti-saturation region. Switchhook detector. When enabled, a logic Low indicates that selected condition is detected. The detect condition is selected by the logic inputs (C2-C1 and E0-E1). The output is open-collector with a built-in 15 k pull-up resistor. No connect. This pin not internally connected. Ring relay driver. Open-collector driver with emitter internally connected to BGND. Receiver summing node. The metallic current (AC and DC) between A(TIP) and B(RING) is equal to 1000 times the current into this pin. The networks that program receive gain, two-wire impedance, and feed resistance all connect to this node. Am79467 Data Sheet ABSOLUTE MAXIMUM RATINGS OPERATING RANGES Storage temperature . . . . . . . . . . . . -60C to +150C Commercial (C) Devices VCC with respect to AGND/DGND . . . . . 0.5 V to +7 V Ambient temperature . . . . . . . . . . . . . . 0C to +70C* VEE with respect to AGND/DGND . . . . . 0.5 V to -7 V VCC . . . . . . . . . . . . . . . . . . . . . . . . . . 4.75 V to 5.25 V VBAT with respect to AGND/DGND . . . 0.5 V to -70 V VEE . . . . . . . . . . . . . . . . . . . . . . . . -4.75 V to -5.25 V BGND with respect to AGND/DGND . . . +3 V to -3 V VBAT . . . . . . . . . . . . . . . . . . . . . . . . . . -24 V to -58 V A(TIP) or B(RING) to BGND: AGND/DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V Continuous . . . . . . . . . . . . . . . . . . . VBAT to +2 V 10 ms (f = 0.1 Hz) . . . . . . . . . VBAT - 20 V to +5 V 1 s (f = 0.1 Hz). . . . . . . . . . VBAT - 40 V to +10 V 250 ns (f = 0.1 Hz) . . . . . . . .VBAT - 70 V to +15 V Current from A(TIP) or B(RING). . . . . . . . . . . . 70 mA Current through relay driver . . . . . . . . . . . . . . . 50 mA Ring relay supply voltage . . . . . . . . 0 V to VBAT + 75 V DA and DB inputs: BGND with respect to AGND/DGND . . . . . . . . . . . -100 mV to +100 mV Operating Ranges define those limits between which device functionality is guaranteed. * Functionality of the device from 0C to +70C is guaranteed by production testing. Performance from - 40C to +85C is guaranteed by characterization and periodic sampling of production units. Voltage on ring-trip inputs . . . . . . . . . .VBAT to 0 V Current into ring-trip inputs . . . . . . . . . . . . 5 mA C2-C1, E0, E1, DET Input voltage . . . . . . . . . . . . . . . . . . . . 0 V to VCC Output voltage (DET not active) . . . . . 0 V to VCC Output current (DET) . . . . . . . . . . . . . . . . . . 5 mA Power Dissipation (TA 70C): Continuous . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 W Peak (t < 100 ms, tREP > 1 s). . . . . . . . . . . . . 4 W Note: Thermal limiting circuitry on chip will shut down the circuit at a junction temperature of about 165C. The device should never be exposed to this temperature. Operation above 145C junction temperature may degrade device reliability. See the SLIC Packaging Considerations for more information. Stresses above those listed under Absolute Maximum Ratings may cause permanent device failure. Functionality at or above these limits is not implied. Exposure to Absolute Maximum Ratings for extended periods may affect device reliability. SLIC Products 5 ELECTRICAL CHARACTERISTICS Description Test Conditions (See Note 1) Min Typ Max Unit Note dB 1, 4 20 4 +35 +40 mV -- 4 Transmission Performance 2-wire return loss 200 Hz to 500 Hz 500 Hz to 1 kHz 1.0 kHz to 3.4 kHz 25 27 23 ZVTX, Analog output impedance 3 VVTX, Analog output offset voltage 0C to +70C -40C to +85C -35 -40 Overload level, 2-wire and 4-wire RL = 600 3.1 Overload level Load impedance > 20 k 3.1 THD, Total harmonic distortion 1.0 kHz, 0 dBm THD, on-hook 0 dBm, RL = 900 , Battery = -51 V 2 Vpk -65 -54 dB 5 dB -- 4 -35.5 Longitudinal Performance Longitudinal to metallic L-T, L-4 balance 200 Hz to 3.4 kHz -1 parts* Longitudinal to metallic L-T, L-4 balance 200 Hz to 1 kHz: 0C to +70C -40C to +85C -2 parts* 1 kHz to 3.4 kHz: 0C to +70C -40C to +85C -2 parts* Longitudinal signal generation 4-L 63 55 58 55 200 Hz to 4 kHz, normal polarity Longitudinal current per pin (A or B) Active state Longitudinal impedance (A or B) 52 -- 4 45 55 25 35 0 Hz to 100 Hz mArms 20 35 /pin Idle Channel Noise C-message weighted noise 2-wire: 0C to +70C -40C to +85C +7 +10 +12 4-wire: 0C to +70C -40C to +85C +7 +10 +12 2-wire: 0C to +70C -40C to +85C -83 -80 -78 4-wire: 0C to +70C -40C to +85C -83 -80 -78 -- 4 dBrnC Psophometric weighted noise -- 4 dBmp 4 Receive Summing Node (RSN) RSN DC voltage IRSN = 0 mA 0 RSN impedance 200 Hz to 3.4 kHz 10 20 RSN current to metallic loop-current gain 300 Hz to 3.4 kHz 1000 1000 1012 1020 0C to +70C -40C to +85C Note: * Performance Grade 6 Am79467 Data Sheet 988 980 V 4 ELECTRICAL CHARACTERISTICS (continued) Description Test Conditions (See Note 1) Min Typ Max 0 0 +0.15 +0.20 Unit Note Insertion Loss and Balance Return Signal (2-Wire to 4-Wire, 4-Wire to 2-Wire, and 4-Wire to 4-Wire, See Test Circuits A and B) Gain accuracy over temperature 0 dBm, 1 kHz 0C to +70C -40C to +85C -0.15 -0.20 Gain accuracy over frequency 300 Hz to 3.4 kHz (relative to 1 kHz): 0C to +70C -40C to +85C -0.10 -0.15 +0.10 +0.15 Gain tracking +3 dBm to -55 dBm (relative to 0 dBm): 0C to +70C -40C to +85C -0.10 -0.15 +0.10 +0.15 Group delay 0 dBm, 1 kHz 3 4 dB 3, 4 4 s 5.3 3 4 5 Line Characteristics Long loops, Active state BAT = -50 V, RLDC = 2000 21 IL, Loop current accuracy IL in constant-current region 0.915IL IL 1.085IL 0.8IL IL 1.2IL IL, Accuracy, Standby state IL V BAT - 3 V = ------------------------------R L + 1800 IL, Loop current Disconnect, RL = 0 VAB, Open Circuit voltage VBAT = -50 V TA = 25C 4 100 42.8 mA A V Power Supply Rejection Ratio (VRIPPLE = 100 mVrms), Active Normal State VCC VEE VBAT 50 Hz to 3.4 kHz 50 Hz to 3.4 kHz 50 Hz to 3.4 kHz Effective internal resistance CAS pin to GND 30 30 35 40 36 41 dB 5 60 k 4 Off-Hook Detector On-threshold RD = 33 k 11.3 17.3 Off-threshold RD = 33 k 9.85 14.7 Hysteresis RD = 33 k 0 3.2 mA Power Dissipation, Battery = -58 V On-hook Open Circuit state 25 On-hook Standby state 50 mW On-hook Active state RL = , VBAT = -50 V 145 300 Off-hook Active state RL = 0 RL = 300 RL = 600 1.5 1.4 1.2 1.8 1.6 1.4 SLIC Products W 7 ELECTRICAL CHARACTERISTICS (continued) Description Test Conditions (See Note 1) Min Typ Max Unit Note Supply Currents, Battery = -58 V ICC, on-hook VCC supply current Open Circuit state Standby state Active state, VBAT = -50 V 1.2 1.7 4.8 2.0 2.5 6.5 IEE, on-hook VEE supply current Open Circuit state Standby state Active state, VBAT = -50 V 0.5 0.9 1.9 1.3 1.6 3.0 Open Circuit state Standby state Active state, VBAT = -50 V 0.3 0.7 2.6 1.2 1.6 4.5 IBAT, on-hook VBAT supply current mA Ground-Key Detector Thresholds IA and IB delta to trigger the ground-key detector 8 12 17 IA and IB delta to clear the triggered ground-key detector 3 7 12 Hysteresis 3 5 8 -500 -100 -50 0 mA Ring-Trip Detector Input Bias current Offset voltage Source resistance = 0 to 2 M Input resistance Unbalanced Balanced nA +50 1 3 Input common mode range mV M VBAT -2 V Logic Inputs (C2-C1, E0, E1) VIH, Input High voltage 2.0 V VIL, Input Low voltage 0.8 IIH, Input High current All inputs except E1 -75 40 Input High current Input E1 -75 45 IIL, Input Low current A -500 Logic Output (DET) VOH, Output Low voltage IOUT = 0.8 mA, 15 k to VCC VOL, Output High voltage IOUT = -0.1 mA, 15 k to VCC Internal pull-up resistor 0.40 V 2.4 8 25 k +0.75 V 10 A Relay Driver Output (RINGOUT) On voltage IOL = 25 mA Off leakage VOH = +12 V 8 +0.2 Am79467 Data Sheet 4 RELAY DRIVER SCHEMATIC RINGOUT BGND SWITCHING CHARACTERISTICS Symbol tgkde Parameter Test Conditions E1 Low to DET High (E0 = 1) E1 Low to DET Low (E0 = 1) Ground-Key Detect state RL open, RG connected (See Figures E and F) Temperature Ranges Min Typ Max 0C to +70C -40C to +85C 3.8 4.0 0C to +70C -40C to +85C 1.1 1.6 0C to +70C -40C to +85C 1.1 1.6 tgkdd E0 High to DET Low (E1 = 0) tgkd0 E0 Low to DET High (E1 = 0) 0C to +70C -40C to +85C 3.8 4.0 tshde E1 High to DET Low (E0 = 1) 0C to +70C -40C to +85C 1.2 1.7 0C to +70C -40C to +85C 3.8 4.0 0C to +70C -40C to +85C 1.1 1.6 0C to +70C -40C to +85C 3.8 4.0 E1 High to DET High (E0 = 1) tshdd E0 High to DET Low (E1 = 1) tshd0 E0 Low to DET High (E1 = 1) Switchhook Detect state RL = 600 , RG open (See Figures E and F) SLIC Products Unit Note s 4 9 SWITCHING WAVEFORMS E1 to DET E1 DET tgkde tshde tgkde tshde E0 to DET E1 E0 DET tshdd tshd0 tgkdd Note: All delays measured at 1.4 V level. 10 Am79467 Data Sheet tgkd0 Notes: 1. Unless otherwise noted, test conditions are BAT = -52 V, VCC = +5 V, VEE = -5 V, RL = 600 , CHP = 18 nF, RDC1 = RDC2 = 52.3 k, CDC = 0.68 F, RD = 33 k, no fuse resistors, D1 = 1N400x, two-wire AC input impedance is a 600 resistance synthesized by the programming network shown below. VTX RT1 CT1 RT2 RSN RRX VRX Where: RT1 = RT2 = RRX = 300 k, CT1 = 150 pF* * CT1 is not required when 23 dB two-wire return loss at higher voice frequencies is acceptable. If CT1 is not used, RT1 and RT2 can be combined into one resistor. If this SLIC is used with a DSLACTM device, CT1 is not required. 2. Overload level is defined when THD = 1%. 3. Balance return signal is the signal generated at VTX by VRX. This specification assumes the two-wire AC load impedance matches the programmed impedance. 4. Not tested in production. This parameter is guaranteed by characterization or correlation to other tests. 5. This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization. Table 1. State E1 C1 C2 SLIC Decoding Two-Wire Status Detector Mode DET Output 0 0 0 0 Open Circuit No active detector Logic level High 1 0 0 1 Active Ground-key detector Ground key 2 0 1 0 Ringing No active detector Logic level High 3 0 1 1 Standby Ground-key detector Ground key 4 1 0 0 Open Circuit No active detector Logic level High 5 1 0 1 Active Loop-current detector Loop-current status 6 1 1 0 Ringing Ring-trip detector Ring-trip status 7 1 1 1 Standby Loop-current detector Loop-current status Note: E0 = 1. For E0 = 0, DET = logic level High. SLIC Products 11 Table 2. Z T = 1000 ( Z 2WIN - 2RF ) User-Programmable Components Where ZT is connected between the VTX and RSN pins. The fuse resistors are RF, and Z2WIN is the desired 2-wire AC input impedance. When computing ZT, the internal current amplifier pole and any external stray capacitance between VTX and RSN must be taken into account. Z ZRX = -----T2 Where ZRX is connected from VRX to the RSN pin and ZT is defined above. This equation sets the receive gain to 0 dB when the SLIC is terminated with an impedance equal to Z2WIN. V----------------RDC1 + R DC2 = 2500 I LOOP Where RDC1, RDC2, and CDC form the network connected to the RDC pin. RDC1 and RDC2 are approximately equal. ILOOP is the desired loop current in the constant-current region. 1 1 CDC = 30 ms aee ------------- + -------------oo R DC1 R DC2 365 RD = --------- , IT 0.5 ms C D = ---------------RD 1 CCAS = ------------------------------( 1.2 * 10 5 )fc 12 Where RD and CD form the network connected from RD to -5 V and IT is the threshold current between on hook and off hook. Where CCAS is the regulator filter capacitor and fc is the desired filter cut-off frequency. Am79467 Data Sheet DC FEED CHARACTERISTICS 3 50 5 4 7 2 45 8 40 VAB (V) 35 30 6 1 25 20 15 10 5 0 0 5 10 15 20 25 30 Loop Current (mA) RDC = 104.6 k VBAT = 51.3 V RD = 33 k Notes: 1. Constant-current region: I L = 2500 -----------R DC 2. Anti-sat (battery tracking) turn-on: V AB = 0.96 V BAT - 3.65 3. Open Circuit voltage: VAB = 1.025 V BAT - 6.23 4. Anti-sat region (IL > IDET): R DC 2500 V AB = 0.96 V BAT - 3.65 + ------------ - IL aee -----------oo 600 600 5. Anti-sat region (IL < IDET): R DC V AB = 1.025 V BAT - 6.23 - I L ae -----------o e 600 o 6. Loop-detect (IDET) threshold: 365 I DET = --------RD 7. Anti-sat transition region, off-hook to on-hook 8. Anti-sat transition region, on-hook to off-hook a. VA-VB (VAB) Voltage vs. Loop Current (Typical) SLIC Products 13 DC FEED CHARACTERISTICS (continued) 30 Loop Current (mA) 25 20 15 10 5 0 0 1000 2000 3000 4000 5000 Load Resistance () RDC = 104.6 k VBAT = 51.3 V RD = 33 k b. Loop Current vs. Load Resistance (Typical) A RSN a RL IL RDC1 SLIC b RDC2 RDC B Feed current programmed by RDC1 and RDC2 c. Feed Programming Figure 1. 14 DC Feed Characteristics Am79467 Data Sheet CDC 6000 TEST CIRCUITS A(TIP) A(TIP) VTX RL VTX SLIC 2 SLIC AGND VL AGND RT VAB RL RL VAB RT RRX RRX 2 RSN RSN B(RING) B(RING) IL2-4 = 20 log (VTX / VAB) VRX IL4-2 = 20 log (VAB / VRX) BRS = 20 log (VTX / VRX) A. Two- to Four-Wire Insertion Loss 1 C B. Four- to Two-Wire Insertion Loss and Balance Return Signal ZD << RL A(TIP) A(TIP) RL 2 S1 VTX VTX R SLIC C SLIC AGND AGND VL RT VAB VL S2 RL 2 RT1 VS VM RRX R RSN B(RING) VRX RT2 ZIN CT1 RSN B(RING) RRX S2 Open, S1 Closed: L-T Long. Bal. = 20 log (VAB / VL) L-4 Long. Bal. = 20 log (VTX / VL) S2 Closed, S1 Open: Note: ZD is the desired impedance (e.g., the characteristic impedance of the line). RL = 20 log (2 VM / VS) 4-L Long. Sig. Gen. = 20 log (VL / VRX) D. Two-Wire Return Loss Test Circuit C. Longitudinal Balance SLIC Products 15 TEST CIRCUITS (continued) VCC 6.2 k A(TIP) DET 15 pF RL = 600 B(RING) E1 E. Loop-Detector Switching A(TIP) B(RING) RG RG: 2 k at VBAT = -48 V F. Ground-Key Switching 16 Am79467 Data Sheet TEST CIRCUITS (continued) -5 V +5 V VCC VEE DA RD DB RD VTX 2.2 nF VTX A(TIP) A(TIP) RT HPA CHP HPB B(RING) B(RING) VRX RSN RDC1 2.2 nF RRX RDC2 RDC CDC RINGOUT AGND/ DGND BATTERY GROUND BGND CBAT BAT VBAT D1 E1 E0 C2 C1 ANALOG GROUND DET CAS DIGITAL GROUND CCAS G. Am79467 Test Circuit SLIC Products 17 PHYSICAL DIMENSION PL028 .485 .495 .450 .456 .042 .056 .062 .083 Pin 1 I.D. .485 .495 .450 .456 .300 .390 REF .430 .013 .021 .026 .032 .050 REF .009 .015 TOP VIEW .090 .120 .165 .180 SEATING PLANE SIDE VIEW 16-038-SQ PL 028 DF79 2-29-96 lv REVISION SUMMARY Revision A to Revision B * Minor changes to the data sheet style and format were made to conform to Legerity standards. * Electrical Characteristics--Under Longitudinal Performance, the specifications for Longitudinal to Metallic moved from the Typ column to the Min column. * Table 2--The equation on the second row was revised. Revision B to Revision C * Minor changes to the data sheet style and format were made to conform to Legerity standards. Revision C to Revision D * The physical dimension (PL028) was added to the Physical Dimension section. * Deleted the Ceramic DIP and Plastic DIP packages and references to them. * Updated the Pin Description table to correct inconsistencies. 18 Am79467 Data Sheet The contents of this document are provided in connection with Legerity, Inc. products. Legerity 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. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this publication. Except as set forth in Legerity's Standard Terms and Conditions of Sale, Legerity 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. Legerity's products 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 in any other application in which the failure of Legerity's product could create a situation where personal injury, death, or severe property or environmental damage may occur. Legerity reserves the right to discontinue or make changes to its products at any time without notice. (c) 1999 Legerity, Inc. All rights reserved. Trademarks Legerity, the Legerity logo and combinations thereof, and DSLAC are trademarks of Legerity, Inc. Other product names used in this publication are for identification purposes only and may be trademarks of their respective companies. P.O. Box 18200 Austin, Texas 78760-8200 Telephone: (512) 228-5400 Fax: (512) 228-5510 North America Toll Free: (800) 432-4009 To contact the Legerity Sales Office nearest you, or to download or order product literature, visit our website at www.legerity.com. To order literature in North America, call: (800) 572-4859 or email: americalit@legerity.com To order literature in Europe or Asia, call: 44-0-1179-341607 or email: Europe -- eurolit@legerity.com Asia -- asialit@legerity.com