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PDF IDT821621 Data sheet ( Hoja de datos )
| Número de pieza | IDT821621 | |
| Descripción | LONG HAUL SLIC | |
| Fabricantes | Integrated Device Technology | |
| Logotipo |  |
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LONG HAUL SLIC
IDT821621
www.DataSheet4U.com
Version 1
October 8, 2003
2975 Stender Way, Santa Clara, California 95054
Telephone: (800) 345-7015 • • FAX: (408) 492-8674
Printed in U.S.A.
© 2003 Integrated Device Technology, Inc.
1 page  
List of Figures
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Loop-Detect Threshold Setting .............................................................................................................................................................. 7
Ring-trip Detection ................................................................................................................................................................................. 8
Relay Drivers Schematic........................................................................................................................................................................ 8
DC Feeding Characteristics ................................................................................................................................................................... 8
DC Feed Programming Circuit............................................................................................................................................................... 8
Two-Wire AC Input Impedance Programming Network ....................................................................................................................... 11
Two-Wire Return Loss ......................................................................................................................................................................... 15
Longitudinal Balance............................................................................................................................................................................ 15
Four-Wire Longitudinal Signal Generation........................................................................................................................................... 16
Two-to-Four Wire Gain......................................................................................................................................................................... 16
Four-to-Two Wire Gain and Four-to-Four Wire Gain ........................................................................................................................... 17
Loop Detector Switching ...................................................................................................................................................................... 17
Basic Application Circuit....................................................................................................................................................................... 18
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List of Figures
3 October 8, 2003
5 Page 
IDT821621
calculated by the equation below:
CCAS = 1---.--7----•----1-1--0---5--π----f-C--
Where, fC is the desired filter cut-off frequency.
IMPEDANCE MATCHING
The two-wire AC input impedance R2WIN is programmed by means
of an external impedance (RT) connected between the RSN and VTX
pins (see Figure 13). RT is calculated by the following equation:
RT = 250(R2WIN – 2RF)
Where, RF is the value of the fuse resistor. Note that when computing
RT, the internal current amplifier pole and any external stray capacitance
between the RSN and VTX pins must be taken into account.
RECEIVE GAIN SETTING
The 4-wire to 2-wire gain (G42L) is defined as the receive gain. It is
calculated by the following equation:
G42L = R---R--R--L--X- • -R----T-----+-----2---5--5--0-0---(-0--R-R---L--T---+-----2----R----F----)
Where, RL is the terminating impedance; RRX is connected between
VRX and RSN; RT is defined above; RF is the fuse resistor. See Figure
11 for details.
LONG HAUL SLIC
THERMAL MANAGEMENT
The IDT821621 uses a power management technique of offloading
the thermal energy from the SLIC to an external resistor RTMG. RTMG is
connected between the TMG and VBAT pins as shown in Figure 13.
This resistor shares some of the loop current and limits the on-chip
power dissipation in Active state.
The selection of RTMG normally needs to satisfy the following
condition: with the programmed loop current being fed into a short circuit
loop from the nominal battery, all of the loop current is supplied by RTMG.
So, RTMG can be calculated by the equation below:
RTMG
≥
--V---B--I-A-L--TO----O--–-P---8---V--
–
70Ω
The power dissipated in the resistor RTMG during Active state is:
PRTMG = (----V----B---A-(--T-R----T–--M---8-G--V--+--–---7--(-0-I--ΩL----•-)--2-R----L--)---)--2- • RTMG
The power dissipated in the SLIC during Active state is:
PSLIC = VBAT • IL – PRTMG – RL(IL)2 + 0.12W
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Functional Description
9
October 8, 2003
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet IDT821621.PDF ] | |
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