AM79489-2JC 데이터 시트보기 (PDF) - Unspecified

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AM79489-2JC

Subscriber Line Interface Circuit

Unspecified 

PIN DESCRIPTIONS

Pin Names

AGND/DGND

A(TIP)

BGND

B(RING)

BSWEN

Type

Gnd

Output

Gnd

Output

—

BSWOUT

Output

BSWTH

C3–C1

C4

CAS

DA

DB

DET

E1

HPA

HPB

NC

OVH

RD

RDC

Input

Input

Input

Capacitor

Input

Input

Output

Input

Capacitor

Capacitor

—

Input

Resistor

Resistor

RFA

RINGOUT

RSN

RSVD

TESTOUT

TMG

VBAT1

VBAT2

VCC

VTX

—

Output

Input

—

Output

—

Battery

Battery

Power

Output

Description

Analog and Digital ground.

Output of A(TIP) power amplifier.

Battery (power) ground.

Output of B(RING) power amplifier.

Battery Switch Control. Internally connected to automatic battery switch circuitry. BSWEN

can be overridden by external logic. BSWEN Low connects VBAT1 to VBAT2. BSWEN

High disconnects VBAT1 from VBAT2.

Buffered Output. Internally connected to battery switch circuitry. The output is open-

collector with a built-in pull-up resistor. BSWOUT Low indicates VBAT1 is connected to

VBAT2. BSWOUT High indicates VBAT1 is disconnected from VBAT2. This output is

valid only in the Active states.

Input for setting automatic battery switch threshold. Normally tied to Battery 2. Tie to

ground for manual switching.

Decoder. TTL compatible. C3 is MSB and C1 is LSB.

Test Relay Input – Active Low. 1 = Off. 0 = On.

Anti-sat pin for capacitor to filter reference voltage when operating in anti-sat region.

Ring-trip negative. Negative input to ring-trip comparator.

Ring-trip positive. Positive input to ring-trip comparator.

Switchhook detector. When enabled, a logic Low indicates the selected detector is

tripped. The detector is selected by the logic inputs (C3–C1). The output is open-collector

with a built-in 15 kΩ pull-up resistor.

Ground-Key Detect Select. E1 = 1 selects the hook switch detector. E1 = 0 selects the

ground-key detector. In the Tip Open state, ground key is selected independent of E1.

High-Pass Filter Capacitor. A(TIP) side of high-pass filter capacitor.

High-Pass Filter Capacitor. B(RING) side of high-pass filter capacitor.

No connect. This pin not internally connected.

Overhead Control. Logic High enables minimized nonmetering overhead. Logic Low

enables 2.2 V metering DC overhead. TTL-compatible.

Detector resistor. Detector threshold set and filter pin.

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). Connection point

for the DC feed current programming network. The other end of the network connects to

RSN. VRDC is negative for normal polarity and positive for reverse polarity.

Resistive feed adjust. Adjust the DC feed resistance gain coefficient, GDC, with external

resistor connected to ground.

Ring Relay Driver. Open-collector driver with emitter internally connected to BGND.

Receive Summing Node. The metallic current (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 current all connect to this node.

Reserved. These pins are reserved for Legerity use. Make no connection to these pins.

Test Relay Driver. Open collector driver with emitter internally connected to AGND.

Thermal Management. External resistor connects this pin to VBAT2 to offload power dis-

sipation from SLIC. Functions during normal polarity, Active state.

Most negative battery supply and substrate connection.

Battery supply for output power amplifiers. Switched to VBAT1 by BSWEN.

+5 V power supply.

Transmit Audio. This output is a 0.5066 unity gain version of the A(TIP) and B(RING)

metallic voltage. VTX also sources the two-wire input impedance programming network.

4

Am79489 Data Sheet

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