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L9217G Datasheet Preview

L9217G Datasheet

Low-Cost Line Interface

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Data Sheet
November 2001
L9217A/G Low-Cost Line Interface
with Reverse Battery and PPM
Features
s Basic forward/reverse battery SLIC functionality at
a low cost
s Pin compatible with Agere Systems Inc. L9218/
L9219 SLIC
s Low active power (typical 154 mW during on-hook
transmission)
s Low-power scan mode for low-power, on-hook
power dissipation (57 mW typical)
s Distortion-free, on-hook transmission
s Convenient operating states:
— Forward powerup
— Reverse powerup
— Low-power scan
— Disconnect (high impedance)
— PPM operational states
s Minimal external components required
s Two gain options to optimize the codec interface
s Adjustable supervision functions:
— Off-hook detector with hysteresis
— Ring trip detector
s Adjustable loop current limit
s Adjustable overhead voltage
s Ramped rate of battery reversal
s Periodic pulse metering (PPM) compatible
s Thermal protection with thermal shutdown indica-
tion
Description
This general-purpose electronic subscriber loop
interface circuit (SLIC) is optimized for low cost, while
still providing a satisfactory set of features. This part
is a pin-for-pin replacement for the Agere L9218/
L9219 SLIC.
The L9217 requires a 5 V power supply and single
battery to operate. This device offers forward and
reverse battery operation. The rate of battery rever-
sal may be ramped to meet international require-
ments. Additionally, a low-power scan mode, wherein
all circuitry except the off-hook supervision is shut
down to conserve power, is available.
The dc current limit may be programmed via a single
external resistor. Both the loop supervision and ring
trip supervision functions are offered with user-
controlled thresholds via external resistors. Over-
head is adequate for 3.14 dBm into 900 of on-hook
transmission.
The device is periodic pulse metering (PPM) compat-
ible, offering a convenient point for meter pulse injec-
tion and filter point for rejection of the meter pulse
signal. In the PPM active modes, overhead voltage is
automatically increased to accommodate on-hook
transmission of meter pulse signals. The level that
the overhead is increased to is set by a single exter-
nal resistor. In this way, the L9217 can accommodate
high-voltage meter pulse signals.
The L9217 is offered with a receive gain that is opti-
mized to interface to a first-generation type codec
(L9217A). It is also offered with a gain option that is
optimized to interface to a third- or fourth-generation
type codec (L9217G). In both cases, minimizing
external components is required at this interface.
Data control is via a parallel data control scheme.
The device is available in a 28-pin PLCC package. It
is built by using a 90 V complementary bipolar
(CBIC) process.




Agere Systems

L9217G Datasheet Preview

L9217G Datasheet

Low-Cost Line Interface

No Preview Available !

L9217A/G Low-Cost Line Interface
with Reverse Battery and PPM
Data Sheet
November 2001
Table of Contents
Contents
Page
Features ......................................................................1
Description...................................................................1
Pin Information ............................................................4
Functional Description .................................................6
Absolute Maximum Ratings (at TA = 25 °C) ................7
Recommended Operating Conditions .........................7
Electrical Characteristics .............................................8
Ring Trip Requirements ..........................................12
Test Configurations ...................................................13
Applications ...............................................................15
dc Applications........................................................19
Battery Feed.........................................................19
Overhead Voltage ................................................19
Rate of Battery Reversal ......................................20
Loop Range..........................................................20
Off-Hook Detection...............................................20
Ring Trip Detection...............................................21
Longitudinal Balance...............................................21
Periodic Pulse Metering (PPM)...............................22
ac Design ................................................................23
Codec Types ........................................................23
ac Interface Network ............................................23
Receive Interface .................................................23
Example 1: Real Termination (First-
Generation Codec) ...............................................24
Example 2: Complex Termination (First-
Generation Codec) ...............................................26
Power Derating .......................................................28
Pin-for-Pin Compatibility with L9218/L9219 ............28
PCB Layout Information ............................................28
Outline Diagram.........................................................29
28-Pin PLCC ...........................................................29
Ordering Information..................................................30
Figures
Page
Figure 13. Loop Current vs. Loop Voltage .............. 19
Figure 14. Off-Hook Detection Circuit ..................... 20
Figure 15. Ring Trip Equivalent Circuit
and Equivalent Application .................... 21
Figure 16. ac Equivalent Circuit .............................. 24
Figure 17. Interface Circuit Using First-
Generation Codec (±5 V Codec) ........... 27
Figure 18. Interface Circuit Using First-
Generation Codec (5 V Only Codec) ..... 27
Tables
Page
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Pin Descriptions ..................................... 4
Input State Coding .................................. 6
Supervision Coding ................................. 6
Power Supply .......................................... 8
2-Wire Port .............................................. 9
Analog Pin Characteristics .................... 10
PPM ...................................................... 10
ac Feed Characteristics ........................ 11
Logic Inputs and Outputs ...................... 12
Parts List for Loop Start Application
Circuit Using T7504-Type Codec .......... 16
900 W Termination, 850 W + 50 nF
Hybrid First-Generation Codec Design
Parameters ........................................... 17
Parts List for Loop Start Application
Circuit Using T8536-Type Codec .......... 18
FB1/FB2 Values vs. Typical Ramp
Time ...................................................... 20
Figures
Page
Figure 1. Functional Diagram...................................3
Figure 2. 28-Pin PLCC.............................................4
Figure 3. Ring Trip Circuits ....................................12
Figure 4. L9217 Basic Test Circuit.........................13
Figure 5. Metallic PSRR.........................................13
Figure 6. Longitudinal PSRR .................................13
Figure 7. Longitudinal Balance ..............................14
Figure 8. RFI Rejection ..........................................14
Figure 9. Longitudinal Impedance..........................14
Figure 10. ac Gains..................................................14
Figure 11. Basic Loop Start Application
Circuit Using T7504-Type Codec............15
Figure 12. Basic Loop Start Application
Circuit Using T8536-Type Codec............17
2 Agere Systems Inc.


Part Number L9217G
Description Low-Cost Line Interface
Maker Agere Systems
Total Page 30 Pages
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