LE7920-2DJC

™ Le7920 Subscriber Line Interface Circuit VE580 Series The Le7920 Subscriber Line Interface Circuit implements the basic telephone line interface functions, and enables the design of low cost, high performance, POTS line interface cards. DISTINCTIVE CHARACTERISTICS „ Control states: Active, Ringing, Standby, and Disconnect „ „ „ „ Low standby power (35 mW) –19 V to –58 V battery operation On-hook transmission Two-wire impedance set by single external impedance „ „ „ „ „ „ Programmable loop-detect threshold Programmable ring-trip detect threshold No –5 V supply required Current Gain = 500 On-chip Thermal Management (TMG) feature Four on-chip relay drivers and relay snubbers, 1 ringing and 3 general purpose (32 PLCC) „ Programmable constant-current feed BLOCK DIAGRAM TMG A(TIP) HPA HPB B(RING) Relay Driver RYOUT3 Relay Driver RYOUT2 Relay Driver RYOUT1 Ring Relay Driver RINGOUT Input Decoder and Control Two-Wire Interface D1 D2 D3 C1 C2 DET VTX RSN Signal Transmission Off-Hook Detector RD RDC CAS Power-Feed Controller DA DB VBAT BGND Ring-Trip Detector VCC VBREF AGND/DGND Document ID# 080146 Date: Rev: J Version: Distribution: Public Document Sep 19, 2007 2 Le7920 Data Sheet TABLE OF CONTENTS Ordering Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Standard Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Top View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 Operating Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 Electrical Characteristics (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 Electrical Characteristics (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 Relay Driver Schematics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 DC Feed Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 Test Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 Test Circuits (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Test Circuits (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 Physical Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 32-Pin PLCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 Revision Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Revision C to Revision D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Revision D to Revision E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Revision E to Revision F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Revision F to Revision G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Revision G to Revision H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Revision H to Revision I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Revision I1 to Revision J1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Revision J1 to Revision J2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 2 Zarlink Semiconductor Inc. Le7920 Data Sheet ORDERING INFORMATION Standard Products Zarlink standard products are available in several packages and operating ranges. The order number (Valid Combination) is formed by a combination of the elements below. Le7920 J C C = Commercial (0°C to 70°C)* PLCC package PACKAGING MATERIAL Blank= Standard package D= Green package (see note) DEVICE NUMBER/DESCRIPTION Le7920 Subscriber Line Interface Circuit PERFORMANCE GRADE Blank = Standard specification –1 = 53 dB Longitudinal Balance –2 = 63 dB Longitudinal Balance Note: Green package meets RoHS Directive 2002/95/EC of the European Council to minimize the environmental impact of electrical equipment. Valid Combinations Valid Combinations list configurations planned to be supported in volume for this device. Consult the local Zarlink sales office to confirm availability of specific valid combinations, to check on newly released combinations, and to obtain additional data on Zarlink’s standard military–grade products. Valid Combinations Le7920* –1 JC –2 DJC *Zarlink reserves the right to fulfill all orders for this device with parts marked with the "Am" part number prefix, until such time as all inventory bearing this mark has been depleted. It should be noted that parts marked with either the "Am" or the "Le" part number prefix are equivalent devices in terms of form, fit, and function. The only difference between the two is in the part number prefix appearing on the topside mark. 3 Zarlink Semiconductor Inc. Le7920 Data Sheet CONNECTION DIAGRAM RYOUT2 5 RYOUT3 6 RYOUT1 RINGOUT VCC BGND B(RING) A(TIP) DB Top View 4 3 2 1 32 31 30 32-Pin PLCC 29 DA 28 RD 27 HPB VBAT 8 26 HPA D2 9 25 NC D1 10 24 VTX NC 11 23 VBREF NC 12 22 RSN DET 13 21 AGND RDC 19 20 NC 17 18 NC 16 CAS 15 C1 14 C2 7 D3 TMG Notes: 1. Pin 1 is marked for orientation. 2. NC = No Connect 4 Zarlink Semiconductor Inc. Le7920 Data Sheet PIN DESCRIPTIONS Pin Name 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 Inputs Decoder. TTL compatible. C2 is MSB and C1 is LSB. CAS Capacitor Anti-Saturation pin for capacitor to filter reference voltage when operating in antisaturation region. D3–D1 Input Relay Driver Control. D3–D1 control the relay drivers RYOUT1, RYOUT2, and RYOUT3. Logic Low on D1 activates the RYOUT1 relay driver. Logic Low on D2 activates the RYOUT2 relay driver. Logic Low on D3 activates the RYOUT3 relay driver. TTL compatible. DA Input Ring-trip negative. Negative input to ring-trip comparator. DB Input Ring-trip positive. Positive input to ring-trip comparator. DET Output Switchhook detector. Logic Low indicates that selected detector is tripped. Logic inputs C2–C1, E1, and E0 select the detector. Open-collector with a built-in 15 kΩ pull-up resistor. 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 — No Connect. Pin not internally connected. 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). RINGOUT Output Ring Relay Driver. Open-collector driver with emitter internally connected to BGND. RSN Input Receive Summing Node. The metallic current (both AC and DC) between A(TIP) and B(RING) is equal to 500 times the current into this pin. The networks that program receive gain, two-wire impedance, and feed resistance all connect to this node. RYOUT1 Output Relay/Switch Driver. Open-collector driver with emitter internally connected to BGND. RYOUT2 Output Relay/Switch Driver. Open-collector driver with emitter internally connected to BGND (PLCC only). RYOUT3 Output Relay/Switch Driver. Open-collector driver with emitter internally connected to BGND (PLCC only). TMG — Thermal Management. External resistor connects between this pin and VBAT to offload power from SLIC. VBAT Battery Battery supply and connection to substrate. VBREF — This is an Zarlink reserved pin and must always be connected to the VBAT pin. VCC Power +5 V power supply. VTX Output Transmit Audio. This output is a 0.50 gain version of the A(TIP) and B(RING) metallic voltage. VTX also sources the two-wire input impedance programming network. 5 Zarlink Semiconductor Inc. Le7920 Data Sheet ABSOLUTE MAXIMUM RATINGS Storage temperature ......................... –55°C to +150°C VCC with respect to AGND/DGND ..... –0.4 V to +7.0 V VBAT with respect to AGND/DGND: Continuous..................................... +0.4 V to –70 V 10 ms ............................................. +0.4 V to –75 V BGND with respect to AGND/DGND........ +3 V to –3 V A(TIP) or B(RING) to BGND: Continuous ........................................ VBAT to +1 V 10 ms (f = 0.1 Hz) ............................. –70 V to +5 V 1 µs (f = 0.1 Hz) ................................ –80 V to +8 V 250 ns (f = 0.1 Hz) .......................... –90 V to +12 V Current from A(TIP) or B(RING).....................±150 mA RINGOUT/RYOUT1,2,3 current.........................50 mA RINGOUT/RYOUT1,2,3 voltage ........... BGND to +7 V RINGOUT/RYOUT1,2,3 transient ....... BGND to +10 V DA and DB inputs Voltage on ring-trip inputs .....................VBAT to 0 V Current into ring-trip inputs ......................... ±10 mA C2–C1 and D3–D1 Input voltage .........................–0.4 V to VCC + 0.4 V Maximum power dissipation, continuous, TA = 70°C, No heat sink (See note) In 32-pin PLCC package................................1.7 W Thermal Data:................................................................θJA In 32-pin PLCC package....................... 43°C/W typ ESD immunity/pin (HBM) ..................................1500 V Note: Thermal limiting circuitry on chip will shut down the circuit at a junction temperature of about 165°C. Continuous operation above 145°C junction temperature may degrade device reliability. Stresses above those listed under "Absolute Maximum Ratings" can 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. 6 Zarlink Semiconductor Inc. Le7920 Data Sheet OPERATING RANGES The operating ranges define those limits between which the functionality of the device is guaranteed. Commercial (C) Devices Ambient temperature .............................0°C to +70°C* VCC..................................................... 4.75 V to 5.25 V VBAT ..................................................... –19 V to –58 V AGND/DGND ..........................................................0 V BGND with respect to AGND/DGND ....................... –100 mV to +100 mV Load resistance on VTX to ground .............. 20 kΩ min * Zarlink guarantees the performance of this device over commercial (0 to 70º C) and industrial (-40 to 85ºC) temperature ranges by conducting electrical characterization over each range and by conducting a production test with single insertion coupled to periodic sampling. These characterization and test procedures comply with section 4.6.2 of Bellcore GR-357-CORE Component Reliability Assurance Requirements for Telecommunications Equipment. Package Assembly The standard (non-green) package devices are assembled with industry-standard mold compounds, and the leads possess a tin/ lead (Sn/Pb) plating. These packages are compatible with conventional SnPb eutectic solder board assembly processes. The peak soldering temperature should not exceed 225°C during printed circuit board assembly. The green package devices are assembled with enhanced environmental compatible lead (Pb), halogen, and antimony-free materials. The leads possess a matte-tin plating which is compatible with conventional board assembly processes or newer leadfree board assembly processes. The peak soldering temperature should not exceed 245°C during printed circuit board assembly. Refer to IPC/JEDEC J-Std-020B Table 5-2 for the recommended solder reflow temperature profile 7 Zarlink Semiconductor Inc. Le7920 Data Sheet ELECTRICAL CHARACTERISTICS Description Test Conditions (See Note 1) Min Typ Max Unit Note dB 1, 4 Ω 4 Transmission Performance 2-wire return loss 200 Hz to 3.4 kHz 26 Analog output (VTX) impedance 3 Analog (VTX) output offset voltage –50 20 +50 mV Overload level, 2-wire and 4-wire Active state 2.5 Vpk 2a Overload level On hook, RLAC = 600 Ω 0.77 Vrms 2b THD, Total Harmonic Distortion 0 dBm +7 dBm dB 5 THD, On hook –64 –55 0 dBm, RLAC = 600 Ω –50 –40 –36 Longitudinal Capability (See Test Circuit D) Longitudinal to metallic L-T, L-4 balance 200 Hz to 1 kHz 0°C to +70°C 0°C to +70°C –40°C to +85°C –40°C to +85°C –1* –2 –1 –2 52 63 50 58 4 4 dB 1 kHz to 3.4 kHz 0°C to +70°C 0°C to +70°C –40°C to +85°C –40°C to +85°C –1* –2 –1 –2 52 58 50 53 Longitudinal signal generation 4-L 200 Hz to 3.4 kHz 40 Longitudinal current per pin (A or B) Active state 20 Longitudinal impedance at A or B 0 to 100 Hz 4 4 27 35 mArms 8 Ω/pin 25 Idle Channel Noise C-message weighted noise RL = 600 Ω RL = 600 Ω 0°C to +70°C –40°C to +85°C 7 +10 +12 dBrnc Psophometric weighted noise RL = 600 Ω RL = 600 Ω 0°C to +70°C –40°C to +85°C –83 –80 –78 dBmp 4 Insertion Loss and Balance Return Signal (See Test Circuits A and B) Gain accuracy 4- to 2-wire 0 dBm, 1 kHz –0.20 0 +0.20 Gain accuracy 2- to 4-wire, 4- to 4-wire 0 dBm, 1 kHz –6.22 –6.02 –5.82 Gain accuracy, 4- to 2-wire On hook –0.35 Gain accuracy, 2- to 4-wire, 4- to 4-wire On hook –6.37 Gain accuracy over frequency 300 to 3.4 kHz relative to 1 kHz –0.15 +0.15 Gain tracking +3 dBm to –55 dBm relative to 0 dBm –0.15 +0.15 Gain tracking On hook 0 dBm to –37 dBm +3 dBm to 0 dBm –0.15 –0.35 +0.15 +0.35 Group delay 0 dBm, 1 kHz +0.35 –6.02 4 Note: * Performance Grade 8 Zarlink Semiconductor Inc. –5.67 4 dB µs 4, 7 Le7920 Data Sheet ELECTRICAL CHARACTERISTICS (continued) Description Test Conditions (See Note 1) Min Typ Max 26 Unit Note Line Characteristics IL, Short Loops, Active state RLDC = 600 Ω 20 23 IL, Long Loops, Active state RLDC = 1930 Ω, BAT = –42.75 V, TA = 25°C 18 19 IL, Accuracy, Standby state BAT – 3 V I L = ------------------------------R L + 400 0.7IL IL 18 30 T A = 25°C Constant-current region IL, Loop current, Disconnect state RL = 0 ILLIM Active, A and B to ground VAB, Open Circuit voltage VBAT = –52 V 85 –42.75 –44 1.3IL mA 100 µA 120 mA V Power Supply Rejection Ratio (VRIPPLE = 100 mVrms), Active Normal State VCC 50 Hz to 3.4 kHz 30 40 VBAT 50 Hz to 3.4 kHz 28 50 Effective internal resistance CAS pin to VBAT 85 170 255 On hook, Disconnect state 25 70 On hook, Standby state 35 100 dB 5 kΩ 4 Power Dissipation On hook, Active state 125 270 Off hook, Standby state RL = 600 Ω 860 1200 Off hook, Active state RL = 300 Ω, RTMG = 2350 Ω 450 800 ICC, On-hook VCC supply current Disconnect state Standby state Active state, BAT = –48 V 1.7 2.2 6.3 4.0 4.0 8.5 IBAT, On-hook VBAT supply current Disconnect state Standby state Active state, BAT = –48 V 0.25 0.55 2.8 1.0 1.5 4.8 mW Supply Currents, Battery = –48V mA RFI Rejection RFI rejection 100 kHz to 30 MHz, (See Figure F) 1.0 mVrms 4 Receive Summing Node (RSN) RSN DC voltage IRSN = 0 mA 0 RSN impedance 200 Hz to 3.4 kHz 10 V 20 Ω 4 Logic Inputs (C2–C1 and D3–D1) VIH, Input High voltage 2.0 VIL, Input Low voltage 0.8 IIH, Input High current –75 IIL, Input Low current –400 40 V µA Logic Output (DET) VOL, Output Low voltage IOUT = 0.3 mA, 15 kΩ to VCC VOH, Output High voltage IOUT = –0.1 mA, 15 kΩ to VCC 0.40 2.4 V Ring-Trip Detector Input (DA, DB) Bias current Offset voltage Source resistance = 2 MΩ 9 Zarlink Semiconductor Inc. –500 –50 –50 0 nA +50 mV 6 Le7920 Data Sheet ELECTRICAL CHARACTERISTICS (continued) Description Test Conditions (See Note 1) Min Typ Max Unit Note Loop Detector On threshold RD = 35.4 kΩ 11.5 17.3 Off threshold RD = 35.4 kΩ 9.4 14.1 Hysteresis RD = 35.4 kΩ 0 4.4 mA Relay Driver Output (RINGOUT, RYOUT1, RYOUT2, RYOUT3) On voltage IOL = 40 mA Off leakage VOH = +5 V Zener breakover IZ = 100 µA Zener On voltage IZ = 30 mA +0.3 6 +0.7 V 100 µA 7.2 10 V RELAY DRIVER SCHEMATICS RINGOUT RYOUT1, RYOUT2, RYOUT3 BGND BGND Notes: 1. Unless otherwise noted, test conditions are BAT = –52 V, VCC = +5 V, RL = 600 Ω, RDC1 = RDC2 = 27.17 kΩ, RTMG = 2350 Ω, RD = 35.4 kΩ, no fuse resistors, CHP = 0.22 µF, CDC = 0.1 µF, CCAS = 0.33 µF, D1 = 1N400x, two-wire AC input impedance is a 600 Ω resistance synthesized by the programming network shown below. VTX RT1 = 75 kΩ CT1 = 120 pF RT2 = 75 kΩ RSN RRX = 150 kΩ VRX 2. a. Overload level is defined when THD = 1%. b. Overload level is defined when THD = 1.5%. 3. Balance return signal is the signal generated at VTX by VRX. This specification assumes that 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. 6. Tested with 0 Ω source impedance. 2 MΩ is specified for system design only. 7. Group delay can be greatly reduced by using a ZT network such as that shown in Note 1. The network reduces the group delay to less than 2 µs and increases 2WRL. The effect of group delay on linecard performance also may be compensated for by synthesizing complex impedance with the QSLAC™ or DSLAC™ device. 8. Minimum current level guaranteed not to cause a false loop detect. 10 Zarlink Semiconductor Inc. Le7920 Table 1. Data Sheet SLIC Decoding State C2 C1 0 0 0 Disconnect Ring trip 1 0 1 Ringing Ring trip 2 1 0 Active Loop detector 3 1 1 Standby Loop detector Table 2. Two-Wire Status DET Output User-Programmable Components Z T = 250 ( Z 2WIN – 2 R F ) 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. ZL 500 Z T Z RX = -----------• ---------------------------------------------------G 42L Z T + 250 ( Z L + 2 R F ) ZRX is connected from VRX to RSN. ZT is defined above, and G42L is the desired receive gain. 1250R DC1 + R DC2 = -------------I LOOP 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. R DC1 + R DC2 C DC = 1.5 ms • ---------------------------------R DC1 • R DC2 510 415 msRD ON = --------- , RD OFF = --------- , C D = 0.5 ---------------IT IT RD RD and CD form the network connected from RD to AGND/ DGND and IT is the threshold current between on hook and off hook. 1 C CAS = ------------------------------ CCAS is the regulator filter capacitor and fc is the desired filter cut-off frequency. 5 3.4 • 10 π f c V BAT – 3 V I STANDBY = --------------------------------400 Ω + R L Standby loop current (resistive region). Thermal Management Equations (Normal Active and Tip Open States)  V BAT – 6 V  R TMG ≥  --------------------------------- – 70 Ω   I LOOP RTMG is connected from TMG to VBAT and saves power within the SLIC in Active and Disconnect state constant-currents only. 2 ( V BAT – 6 V – ( I L • R L ) ) - • R TMG P RTMG = ----------------------------------------------------------------------( R TMG + 70 Ω ) Power dissipated in the TMG resistor, RTMG, during Active and Disconnect states. 2 2 P SLIC = V BAT • I L – P RTMG – R L ( I L ) + 0.12 W Power dissipated in the SLIC while in Active and Disconnect states. 11 Zarlink Semiconductor Inc. Le7920 Data Sheet DC FEED CHARACTERISTICS 60 3 2 VAB (volts) 1 0 IL (mA) RDC = RDC1 + RDC2 = 54.34 kΩ BAT = –48 V Notes: 1250 1. V AB = I L R L' = ------------ R L' , where R L' = R L + 2 R F R DC R DC 2. V AB = 0.857 ( V BAT + 3.3 ) – I L ----------300 R DC 3. V AB = 0.857 ( V BAT + 1.2 ) – I L ----------300 a. Load Line (Typical) 12 Zarlink Semiconductor Inc. 30 Le7920 Data Sheet A a RL I SLIC L RSN RDC1 b RDC2 B RDC Feed current programmed by RDC1 and RDC2 b. Feed Programming Figure 1. DC Feed Characteristics 13 Zarlink Semiconductor Inc. CDC Le7920 Data Sheet TEST CIRCUITS A(TIP) RL 2 VTX SLIC VAB VL RT AGND RL RRX 2 RSN B(RING) IL2-4 = 20 log (VTX / VAB) A. Two- to Four-Wire Insertion Loss A(TIP) VTX SLIC VAB RL AGND RT RRX B(RING) RSN VRX IL4-2 = 20 log (VAB / VRX) BRS = 20 log (VTX / VRX) B. Four- to Two-Wire Insertion Loss and Balance Return Signal 1 ωC A(TIP)