View AM79M574_516785.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

AM79M574
Metering Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
Programmable loop-detect threshold Ground-key detect Performs polarity reversal Line-feed characteristics independent of battery variations Test relay driver optional Programmable constant-resistance feed Supports 2.2 Vrms metering (12 and 16 kHz) On-chip switching regulator for low-power dissipation Two-wire impedance set by single external impedance Tip Open state for ground-start lines On-hook transmission
BLOCK DIAGRAM
Ring Relay Driver A(TIP) Test Relay Driver Ground-Key Detector HPA Two-Wire Interface HPB Signal Transmission Off-Hook Detector B(RING) DA DB VREG L VBAT BGND CHS QBAT CHCLK VCC VEE AGND
16857C-001
Power-Feed Controller Ring-Trip Detector
Switching Regulator
Notes: 1. AM79M574--E0 and E1 inputs; ring and test relay drivers sourced internally to BGND. 2. Current gain (K1) = 1000.

RINGOUT TESTOUT C1 C2 C3 C4 E1 E0 DET
Input Decoder and Control
VTX RSN
RD RDC
Publication# 080135 Rev: E 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.
AM79M574
J
C
TEMPERATURE RANGE C = Commercial (0C to 70C)*
PACKAGE TYPE J = 32-Pin Plastic Leaded Chip Carrier (PL 032)
PERFORMANCE GRADE Blank = Standard Specification -1 = Performance Grading -2 = Performance Grading
DEVICE NAME/DESCRIPTION AM79M574 Subscriber Line Interface Circuit
Valid Combinations Valid Combinations AM79M574 -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 Legerity's standard military 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
AM79M574 Data Sheet
CONNECTION DIAGRAM Top View
RINGOUT B(RING)
A(TIP) 31
BGND
VREG
VCC
32
30
4
3
2
1
DB
TP TESTOUT L VBAT QBAT CHS CHCLK C4 E1
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
29 28 27 26 25 24 23 22 21
TP DA RD HPB HPA VTX VEE RSN AGND
Notes: 1. Pin 1 is marked for orientation. 2. TP is a thermal conduction pin tied to substrate (QBAT). 3. NC = No connect
SLIC Products
DGND
E0
C2
C3
DET
C1
RDC
3
PIN DESCRIPTIONS
Pin Names AGND A(TIP) BGND B(RING) C3-C1 C4 CHCLK CHS DA DB DET DGND E0 E1 HPA HPB L Type Gnd Output Gnd Output Input Input Input Input Input Input Output Gnd Input Input Capacitor Capacitor Output Analog (quiet) ground Output of A(TIP) power amplifier Battery (power) ground Output of B(RING) power amplifier Decoder. TTL compatible. C3 is MSB and C1 is LSB. Test relay driver command. TTL compatible. A logic Low enables the driver. Chopper clock. Input to switching regulator (TTL compatible). Frequency = 256 kHz (Nominal). Chopper Stabilization. Connection for external stabilization components. Ring-trip negative. Negative input to ring-trip comparator. Ring-trip positive. Positive input to ring-trip comparator. Detector. When enabled, a logic Low indicates that the selected detector is tripped. Logic inputs C3-C1, E1, and E0 select the detector. Open-collector with a built-in 15 k pull-up resistor. Digital ground Read Enable. A logic High enables DET. A logic Low disables DET. Ground enable. When E0 is High, E1 = High connects the ground-key detector to DET, and E1 = Low connects the off-hook or ring-trip detector to DET. High-pass filter capacitor. A(TIP) side of high-pass filter capacitor. High-pass filter capacitor. B(RING) side of high-pass filter capacitor. Switching Regulator Power Transistor. Connection point for filter inductor and anode of catch diode. Has up to 60 V of pulse waveform and must be isolated from sensitive circuits. Keep the diode connections short because of the high currents and high di/dt. Quiet Battery. Filtered battery supply for the signal processing circuits. Detector resistor. Threshold modification and filter point for the off-hook detector. DC feed resistor. Connection point for the DC feed resistance programming network, which also connects to the Receiver Summing Node (RSN). VRDC is negative for normal polarity and positive for reverse polarity. Ring relay driver. Sourcing from BGND with internal diode to QBAT. Receive Summing Node. The metallic current (AC and DC) between A(TIP) and B(RING) = 1000 x the current into this pin. The networks that program receive gain, two-wire impedance, and feed resistance all connect to this node. This node is extremely sensitive. Route the 256 kHz chopper clock and switch lines away from the RSN node. Test relay driver. Sourcing from BGND with internal diode to QBAT. Thermal pin. Connection for heat dissipation. Internally connected to substrate (QBAT). Leave as open circuit or connected to QBAT. In both cases, the TP pins can connect to an area of copper on the board to enhance heat dissipation. Battery supply. Connected to office battery supply through an external protection diode. +5 V power supply -5 V power supply Regulated Voltage. Provides negative power supply for power amplifiers, connection point for inductor, filter capacitor, and chopper stabilization. Transmit Audio.This output is 0.510 times the A(TIP) and B(RING) metallic voltage. The other end of the two-wire input impedance programming network connects here. Description
QBAT RD RDC
Battery Resistor Resistor
RINGOUT RSN
Output Input
TESTOUT TP
Output Thermal
VBAT VCC VEE VREG VTX
Battery Power Power Input Output
4
AM79M574 Data Sheet
ABSOLUTE MAXIMUM RATINGS
Storage temperature . . . . . . . . . . . . -55C to +150C VCC with respect to AGND/DGND . . .-0.4 V to +7.0 V VEE with respect to AGND/DGND . . .+0.4 V to -7.0 V VBAT with respect to AGND/DGND . . . +0.4 V to -70 V Note: Rise time of VBAT (dv/dt) must be limited to 27 V/s or less when QBAT bypass = 0.33 F. BGND with respect to AGND/DGND. . . . . . . . . . . . . . . .+1.0 V to -3.0 V A(TIP) or B(RING) to BGND: Continuous . . . . . . . . . . . . . . . . . -70 V to +1.0 V 10 ms (f = 0.1 Hz) . . . . . . . . . . . . -70 V to +5.0 V 1 s (f = 0.1 Hz). . . . . . . . . . . . . . . -90 V to +10 V 250 ns (f = 0.1 Hz) . . . . . . . . . . . .-120 V to +15 V Current from A(TIP) or B(RING). . . . . . . . . . . .150 mA Voltage on RINGOUT. . . . .BGND to 70 V above QBAT Voltage on TESTOUT. . . . .BGND to 70 V above QBAT Current through relay drivers . . . . . . . . . . . . . . 60 mA Voltage on ring-trip inputs (DA and DB) . . . . . . . . . . . . . . . . . . . . VBAT to 0 V Current into ring-trip inputs . . . . . . . . . . . . . . . . .10 mA Peak current into regulator switch (L pin) . . . . . . . . . . . . . . . . . . . . . . 150 mA Switcher transient peak off voltage on L pin . . . . . . . . . . . . . . . . . . . . . +1.0 V C4-C1, E0, E1, CHCLK to AGND/DGND. . . . . . . . . . . .-0.4 V to VCC + 0.4 V Maximum power dissipation, (see note). . . .TA = 70C In 32-pin PLCC package . . . . . . . . . . . . . . 1.74 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.
OPERATING RANGES
Commercial (C) Devices Ambient temperature . . . . . . . . . . . . . . .0C to +70C VCC . . . . . . . . . . . . . . . . . . . . . . . . . . 4.75 V to 5.25 V VEE . . . . . . . . . . . . . . . . . . . . . . . . -4.75 V to -5.25 V VBAT . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 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 . . . . . . . 10 k min
Operating Ranges define those limits between which the functionality of the device 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.
SLIC Products
5
ELECTRICAL CHARACTERISTICS
Description Analog (VTX) output impedance Analog (VTX) output offset 0C to +70C -1* -40C to +85C -1 Analog (RSN) input impedance 300 Hz to 3.4 kHz Longitudinal impedance at A or B Overload level Z2WIN = 600 to 900 4-wire 2-wire -3.1 -6.0 -35 -30 -40 -35 1 Test Conditions (See Note 1) Min Typ 3 +35 +30 +40 +35 20 35 +3.1 +6.0 Max Unit -- -- 4 4 4 -- -- 2 Note
mV
Vpk
Transmission Performance, 2-Wire Impedance 2-wire return loss (See Test Circuit D) 300 Hz to 500 Hz 500 Hz to 2500 Hz 2500 Hz to 3400 Hz 26 26 20 dB 4, 14
Longitudinal Balance (2-Wire and 4-Wire, See Test Circuit C) RL = 600 , longitudinal to metallic L-T, L-4 (normalized to unity gain) Longitudinal to metallic L-T, L-4 300 Hz to 3400 Hz -1* 48 52 -- -- 4 -- -- -- 4 --
200 Hz to 1 kHz normal polarity 0C to +70C normal polarity -40C to +85C reverse polarity 1 kHz to 3.4 kHz normal polarity 0C to +70C normal polarity -40C to +85C reverse polarity
-2* -2 -2 -2* -2 -2 -1*
63 58 54 58 54 54 40 42 25 18
dB
Longitudinal signal generation 4-L Longitudinal current capability per wire
300 Hz to 800 Hz 300 Hz to 800 Hz Active state OHT state
mArms
4
Insertion Loss (2- to 4-Wire and 4- to 2-Wire, See Test Circuits A and B) Gain accuracy 2- to 4-wire 2- to 4-wire 2- to 4-wire 2- to 4-wire 4- to 2-wire 4- to 2-wire 4- to 2-wire 4- to 2-wire Variation with frequency 0 dBm, 1 kHz, 0C to +70C 0 dBm, 1 kHz, -40C to +85C 0 dBm, 1 kHz, 0C to +70C 0 dBm, 1 kHz, -40C to +85C 0 dBm, 1 kHz, 0C to +70C 0 dBm, 1 kHz, -40C to +85C 0 dBm, 1 kHz, 0C to +70C 0 dBm, 1 kHz, -40C to +85C 300 Hz to 3400 Hz Relative to 1 kHz 0C to +70C -40C to +85C +7 dBm to -55 dBm, ref 0 dBm 0C to +70C -40C to +85C 5.75 5.65 5.75 5.70 -0.15 -0.20 -0.1 -0.15 5.85 5.85 5.85 5.85 6.00 6.05 5.95 6.00 +0.15 +0.20 +0.1 +0.15 -- 4 -- 4 -- 4 -- 4 -- -- -- 4 -- 4 4
-1* -1
-1* -1
dB
-0.1 -0.15 -0.1 -0.15
+0.1 +0.15 +0.1 +0.15
Gain tracking
Notes: * P.G. = Performance Grade -2 grade performance parameters are equivalent to -1 performance parameters except where indicated.
6
AM79M574 Data Sheet
ELECTRICAL CHARACTERISTICS (continued)
Description Test Conditions (See Note 1) Min Typ Max Unit Note Balance Return Signal (4- to 4-Wire, See Test Circuit B) Gain accuracy 0 dBm, 1 kHz, 0C to +70C 0 dBm, 1 kHz, -40C to +85C 0 dBm, 1 kHz, 0C to +70C 0 dBm, 1 kHz, -40C to +85C 300 Hz to 3400 Hz Relative to 1 kHz 0C to +70C -40C to +85C +7 dBm to -55 dBm, ref 0 dBm 0C to +70C -40C to +85C f = 1 kHz -6.00 -6.05 -5.95 -6.00 -5.85 -5.85 -5.85 -5.85 -5.75 -5.65 -5.75 -5.70 dB -0.1 -0.15 -0.1 -0.15 5.3 +0.1 +0.15 +0.1 +0.15 s 3 3, 4 3 3, 4 -- -- 3, 4 3, 4 -- 4 4 4, 15
-1* -1
Variation with frequency
Gain tracking
Group delay
Total Harmonic Distortion (2- to 4-Wire or 4- to 2-Wire, See Test Circuits A and B) Total harmonic distortion Total harmonic distortion with metering Idle Channel Noise C-message weighted noise 2-wire, 0C to +70C 2-wire, 0C to +70C 2-wire, -40C to +85C 4-wire, 0C to +70C 4-wire, 0C to +70C 4-wire, -40C to +85C Psophometric weighted noise 2-wire, 0C to +70C 2-wire, 0C to +70C 2-wire, -40C to +85C 4-wire, 0C to +70C 4-wire, 0C to +70C 4-wire, -40C to +85C Single Frequency Out-of-Band Noise (See Test Circuit E) Metallic 4 kHz to 9 kHz 9 kHz to 1 MHz 256 kHz and harmonics 1 kHz to 15 kHz Above 15 kHz 256 kHz and harmonics -76 -76 -57 dBm Longitudinal -70 -85 -57 4, 5, 9 4, 5, 9 4, 5 4, 5, 9 4, 5, 9 4, 5 -1* +7 +7 +7 +7 +7 +7 -83 -83 -83 -83 -83 -83 +15 +12 +15 dBrnC -1* +15 +12 +15 -75 -78 -75 dBmp -1* -75 -78 -75 7 7 4, 7 7 7 4, 7 4 0 dBm, 300 Hz to 3.4 kHz +9 dBm, 300 Hz to 3.4 kHz -64 -55 -50 -40 dB -35 4, 11
-1*
Line Characteristics (See Figure 1) BAT = -48 V, RL = 600 and 900 , RFEED = 800 Apparent battery voltage Loop-current accuracy Loop current--Tip Open state Active state Active state RL = 600 47 -7.5 50 53 +7.5 1.0 1.0 -20 +20 130 mA % 10 V
Loop current--Open Circuit state RL = 0 Loop-current limit accuracy Fault current limit, ILLIM (IAX + IBX) OHT state Active state A and B shorted to GND
SLIC Products
7
ELECTRICAL CHARACTERISTICS (continued)
Description Test Conditions (See Note 1) Min Typ Max Unit Note Power Dissipation BAT = -48 V, Normal Polarity On-hook Open Circuit state -1* On-hook OHT state -1* On-hook Active state -1* Off-hook OHT state Off-hook Active state Supply Currents VCC On-hook supply current Open Circuit state OHT state Active state Open Circuit state OHT state Active state Open Circuit state OHT state Active state 3.0 6.0 7.5 1.0 2.2 2.7 0.4 3.0 4.0 4.5 10.0 12.0 2.3 3.5 6.0 1.0 5.0 6.0 mA RL = 600 RL = 600 35 35 135 135 200 200 500 650 120 80 250 200 400 300 750 1000 mW
VEE On-hook supply current
VBAT On-hook supply current
Power Supply Rejection Ratio (VRIPPLE = 50 mVrms) VCC 50 Hz to 3400 Hz -1* 3.4 kHz to 50 kHz -1* VEE 50 Hz to 3400 Hz -1* 3.4 kHz to 50 kHz -1* VBAT 50 Hz to 3400 Hz -1* 3.4 kHz to 50 kHz -1* Off-Hook Detector Current threshold accuracy IDET = 365/RD Nominal -20 +20 % 25 30 22 25 20 25 10 10 27 30 20 25 45 45 6, 7 35 35 40 40 dB 25 25 45 45 6, 7 40 40 6, 7
Ground-Key Detector Thresholds, Active State, BAT = -48 V (See Test Circuit F) Ground-key resistance threshold B(RING) to GND Ground-key current threshold Ring-Trip Detector Input Bias current Offset voltage Source resistance 0 to 2 M -5 -50 -0.05 0 +50 A mV 13 B(RING) to GND Midpoint to GND 2.0 5.0 9 9 10.0 k mA 8
8
AM79M574 Data Sheet
ELECTRICAL CHARACTERISTICS (continued)
Description Test Conditions (See Note 1) Min Typ Max Unit Note Logic Inputs (C4-C1, E0, E1, and CHCLK) Input High voltage Input Low voltage Input High current Input High current Input Low current Logic Output (DET) Output Low voltage Output High voltage IOUT = 0.8 mA IOUT = -0.1 mA 2.4 0.4 V All inputs except E1 Input E1 -75 -75 -0.4 2.0 V 0.8 40 45 A mA
Relay Driver Outputs (RINGOUT, TESTOUT) On voltage Off leakage Clamp voltage 50 mA sink QBAT -2 50 mA source BGND -2 BGND -0.95 0.5 100 V A V
RELAY DRIVER SCHEMATICS
BGND
BGND
RINGOUT
TESTOUT
QBAT
QBAT
16857C-002
SLIC Products
9
SWITCHING CHARACTERISTICS
Symbol Parameter E1 Low to DET High (E0 = 1) tgkde E1 Low to DET Low (E0 = 1) tgkdd tgkd0 E0 High to DET Low (E1 = 0) E0 Low to DET High (E1 = 0) E1 High to DET Low (E0 = 1) tshde E1 High to DET High (E0 = 1) tshdd tshd0 E0 High to DET Low (E1 = 1) E0 Low to DET High (E1 = 1) Switchhook Detect state RL = 600 , RG open (See Figure G) 0C to +70C -40C to +85C 0C to +70C -40C to +85C 0C to +70C -40C to +85C 3.8 4.0 1.1 1.6 3.8 4.0 Ground-Key Detect state RL open, RG connected (See Figure H) 0C to +70C -40C to +85C 0C to +70C -40C to +85C 0C to +70C -40C to +85C 0C to +70C -40C to +85C 1.1 1.6 1.1 1.6 3.8 4.0 1.2 1.7 Test Conditions Temperature Range 0C to +70C -40C to +85C Min Typ Max 3.8 4.0 Unit Note
s
4
SWITCHING WAVEFORMS
E1 to DET E1
DET tgkde tshde tgkde tshde
E0 to DET E1
E0
DET
tshdd Note: All delays measured at 1.4 V level.
tshd0
tgkdd
tgkd0
16857C-003
10
AM79M574 Data Sheet
Notes: 1. Unless otherwise noted, test conditions are BAT = -48 V, VCC = +5 V, VEE = -5 V, RL = 600 , CHP = 0.22 F, RDC1 = RDC2 = 20 k, CDC = 0.1 F, Rd = 51.1 k, no fuse resistors, two-wire AC output impedance, programming impedance (ZT) = 306 k resistive, receive input summing impedance (ZRX) = 300 k resistive. (See Table 2 for component formulas.) 2. Overload level is defined when THD = 1%. 3. Balance return signal is the signal generated at VTX by VRX. This specification assumes that the two-wire AC load impedance matches the impedance programmed by ZT. 4. Not tested in production. This parameter is guaranteed by characterization or correlation to other tests. 5. These tests are performed with a longitudinal impedance of 90 and metallic impedance of 300 for frequencies below 12 kHz and 135 for frequencies greater than 12 kHz. These tests are extremely sensitive to circuit board layout. 6. This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization. 7. When the SLIC is in the Anti-sat 2 operating region, this parameter is degraded. The exact degradation depends on system design. The Anti-sat 2 region occurs at high loop resistances whenVBAT-VAX - VBX is less than approximately 17V. 8. "Midpoint" is defined as the connection point between two 300 series resistors connected between A(TIP) and B(RING). 9. Fundamental and harmonics from 256 kHz switch-regulator chopper are not included. 10. Loop-current limit which depends upon the programmed apparent open circuit voltage and the feed resistance is calculated as follows: In OHT state:
I LIMIT = 0.5
V apparent -------------------R FEED
In Active state:
I LIMIT = 0.8
V apparent -------------------R FEED
11. Total harmonic distortion with metering as specified with a metering signal of 2.2 Vrms at the two-wire output, and a transmit signal of +3 dBm or receive signal of -4 dBm. The transmit or receive signals are single-frequency inputs, and the distortion is measured as the highest in-band harmonic at the two-wire or the four-wire output relative to the input signal. 12. Noise with metering is measured by applying a 2.2 Vrms metering signal (measured at the two-wire output) and measuring the psophometric noise at the two-wire and four-wire outputs over a 200 ms time interval. 13. Tested with 0 source impedance. 2 M is specified for system design purposes only. 14. Assumes the following ZT network: VTX 153 k 56 pF 15. Group delay can be considerably reduced by using a ZT network such as that shown in Note 14. The network reduces the group delay to less than 2 s. The effect of group delay on linecard performance may be compensated for by using the QSLACTM or DSLACTM devices. 153 k RSN
Table 1. SLIC Decoding
DET Output State 0 1 2 3 4 5 6 7 C3 C2 C1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 Two-Wire Status Open Circuit Ringing Active On-hook TX (OHT) Tip Open Reserved Active Polarity Reversal OHT Polarity Reversal E0 = 1* E1 = 0 Ring trip Ring trip Loop detector Loop detector Loop detector Loop detector Loop detector Loop detector E0 = 1* E1 = 1 Ring trip Ring trip Ground key Ground key -- -- Ground key Ground key
Note: * Logic Low on E0 disables the DET output into the open-collector state.
SLIC Products
11
Table 2.
Z T = 510 ( Z 2WIN - 2R F )
User-Programmable Components
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. ZRX is connected from VRX to the RSN pin, ZT is defined above, and G42L is the desired receive gain. RDC1, RDC2, and CDC form the network connected to the RDC pin. RDC1 and RDC2 are approximately equal.
ZL 1000 * ZT Z RX = ---------- * ------------------------------------------------G 42L Z T + 510 ( Z L + 2R F ) R DCI + R DC2 = 50 ( R FEED - 2R F ) R DC1 + R DC2 C DC = 1.5 ms * ------------------------------R DC1 * R DC2 365 0.5 ms R D = --------, C D = ---------------IT RD V MG K 1 ( )Z L * Z T Z M = -------------- * -----------------------------------------------------------------------V M2W Z T + 0.51 * K 1 ( ) ( 2R F + Z L )
RD and CD form the network connected from RD to -5 V and IT is the threshold current between on-hook and off-hook. ZM is connected from VMG (metering source) to the RSN pin, VM2W is the desired magnitude of the metering signal at the 2-wire output (usually 2.2 Vrms) and K1 ( ) is defined below. 1000 K 1 ( ) = --------------------------------------------------------------------------------------------------------------9 1 + j ( 11.5 * 10 + CX 2 ) ( 36 + Z L + 2R F ) where: CX = The values of the identical capacitors from A and B to GND = 2 * metering frequency
12
AM79M574 Data Sheet
DC FEED CHARACTERISTICS
6 4
3
5 2
1
7
VBAT = 47.3 V RDC = 40 k Notes: R DC 1. Constant-resistance region: V AB = 50 - I L ---------
Active state OHT state
50
2. Anti-sat-1 turn-on:
V AB = 28.48 V V AB = 0.992 V BAT - 13.8 V AB = 0.44 V BAT + 15.89, V AB = 38.85 V, V BAT < 52.2 V (Anti-sat -2) V BAT 52.2 V (Anti-sat -1)
3. Anti-sat-2 turn-on:
4. Open Circuit voltage:
5. Anti-sat -1 region:
R DC V AB = 38.85 - IL -----------101.3 R DC V AB = 0.44 V BAT + 15.89 - IL -----------173.9 1992 I L = ----------R DC
6. Anti-sat -2 region:
7. Current limit:
a. VA-VB (VAB) Voltage vs. Loop Current (Typical)
SLIC Products
13
DC FEED CHARACTERISTICS (continued)
VBAT = 47.3 V RDC = 40 k b. Loop Current vs. Load Resistance (Typical)
A
a
RL b
IL SLIC
RSN RDC1
RDC2 B RDC
CDC
Feed resistance programmed by RDC1 and RDC2 c. Feed Programming
16857C-004
Figure 1.
DC Feed Characteristics
14
AM79M574 Data Sheet
TEST CIRCUITS
A(TIP) RL 2 VL RL 2 B(RING) RSN VAB VTX RT VAB RL A(TIP) VTX RT SLIC AGND RTMG VMG
SLIC AGND
RRX B(RING) RSN
RRX VRX
IL2-4 = -20 log (VTX / VAB)
IL4-2 = -20 log (VAB / VRX) BRS = 20 log (VTX / VRX) B. Four- to Two-Wire Insertion Loss and Balance Return Signal
A. Two- to Four-Wire Insertion Loss
RL 2 1/C << RL A(TIP) SLIC C S1 VL S2 B(RING) RL 2 RSN VRX RRX VL AGND S2 Closed, S1 Open: 4-L Long. Sig. Gen. = -20 log (VL / VRX) VTX S1 Closed, S2 Open RT L-T Long. Bal. = -20 log (VAB / VL) L-4 Long. Bal. = -20 log (VTX / GTX * VL)
C. Longitudinal Balance ZD A(TIP) VTX Note: ZD is the desired impedance (i.e., the characteristic impedance of the line).
R VS R VM RT SLIC
RL = 20 log (2 VM / VS) B(RING) RSN ZIN RRX
D. Two-Wire Return Loss Test Circuit
SLIC Products
15
TEST CIRCUITS (continued)
RL 68 C A(TIP) 1/C << 90 SM 56 IDC SLIC RL B(RING) A(TIP)
68
C B(RING) SE
RG
Current Feed and Ground Key E. Single-Frequency Noise F. Ground-Key Detection
VCC 6.2 k A(TIP) A(TIP) RL = 600 E0 B(RING) E1 DET 15 pF
B(RING) RG = 2 k
G. Ground-Key Switching
H. Loop-Detector Switching
16
AM79M574 Data Sheet
PHYSICAL DIMENSION
PL032
.447 .453 .485 .495 .009 .015 .125 .140 .080 .095 SEATING PLANE .400 REF. .013 .021 .026 .032 TOP VIEW .050 REF. .490 .530 .042 .056
.585 .595 .547 .553
Pin 1 I.D.
SIDE VIEW
16-038FPO-5 PL 032 DA79 6-28-94 ae
REVISION SUMMARY Revision B to Revision C
* *
Minor changes were made to the data sheet style and format to conform to Legerity standards.
In the Pin Description table, inserted/changed TP pin description to: "Thermal pin. Connection for heat dissipation. Internally connected to substrate (QBAT). Leave as open circuit or connected to QBAT. In both cases, the TP pins can connect to an area of copper on the board to enhance heat dissipation."
Revision C to Revision D
* * * *
Minor changes were made to the data sheet style and format to conform to Legerity standards.
The physical dimension (PL032) was added to the Physical Dimension section. Deleted the Ceramic DIP and Plastic DIP part (Am79570) and references to it. Updated the Pin Description table to correct inconsistencies.
Revision D to Revision E
SLIC Products
17
Legerity provides silicon solutions that enhance the performance, speeds time-to-market, and lowers the system cost of our customers' products. By combining process, design, systems architecture, and a complete set of software and hardware support tools with unparalleled factory and worldwide field applications support, Legerity ensures its customers enjoy a smoother design experience. It is this commitment to our customers that places Legerity in a class by itself.
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, DSLAC and QSLAC 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

▲Up To Search▲

Price & Availability of AM79M574

	To Download AM79M574 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .