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參數(shù)資料
| 型號(hào)： | L9219A |
| 廠商： | Lineage Power |
| 英文描述： | Low-Cost Line Interface with Reverse Battery and Dual Current Limit(帶反相電池和雙電流限制的低價(jià)格線接口) |
| 中文描述： | 低成本線接口，具有反向電池和雙電流限制（帶反相電池和雙電流限制的低價(jià)格線接口） |
| 文件頁(yè)數(shù)： | 1/2頁(yè) |
| 文件大?。?/td> | 145K |
| 代理商： | L9219A |
Product Brief
June 2000
L9219A/G Low-Cost Line Interface
with Reverse Battery and Dual Current Limit
Features
I
Basic forward/reverse battery SLIC functionality at
a low cost
I
Pin compatible with Lucent L9217 and L9218
SLICs
I
Low active power (typical 135 mW during on-hook
transmission)
I
Low-power scan mode for low-power on-hook
power dissipation (55 mW typical)
I
Distortion-free on-hook transmission
I
Convenient operating states:
— Forward active-low current limit
— Forward active-high current limit
— Reverse active-low current limit
— Reverse active-high current limit
— Low-power scan
— Disconnect (high impedance)
I
Minimal external components required
I
Two gain options to optimize codec interface
I
Adjustable supervision functions:
— Off-hook detector with hysteresis
— Ring trip detector
I
Logic controlled high and low current limit
I
Ramped rate of battery reversal
I
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 Lucent Technolo-
gies L9217 and L9218 SLICs.
The L9219 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. Via the logic table, the current limit
may be increased a nominal 42% above the value
set by the I
PROG
resistor, giving the user a high-low
current limit option.
Device overhead is fixed and is adequate for
3.14 dBm into 900
of on-hook transmission.
Both the loop supervision and ring trip supervision
functions are offered with user-controlled thresholds
via external resistors.
The L9219 is offered with a receive gain that is opti-
mized for interface to a first-generation type codec
(L9219A). It is also offered with a gain option that is
optimized for interface to a third- or fourth-generation
type codec (L9219G); in both cases, minimizing
external components 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.
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