AM7945JC Advanced Micro Devices, AM7945JC Datasheet
AM7945JC
Available stocks
Related parts for AM7945JC
AM7945JC Summary of contents
Page 1
Am7945 Subscriber Line Interface Circuit DISTINCTIVE CHARACTERISTICS Programmable constant-current feed Current gain = 200 Programmable loop-detect threshold Low power Standby state Ground-key detector Tip Open state for ground-start lines – –56.5 V battery operation BLOCK DIAGRAM TMG A(TIP) ...
Page 2
ORDERING INFORMATION Standard Products AMD standard products are available in several packages and operating ranges. The order number (Valid Combination) is formed by a combination of the elements below. Am7945 J Valid Combinations Am7945 Note: * Functionality of the device ...
Page 3
CONNECTION DIAGRAM Top View TP RINGOUT NC TMG VBAT DET Notes: 1. Pin 1 is marked for orientation thermal conduction pin tied to substrate Connect 32-Pin PLCC 4 3 ...
Page 4
PIN DESCRIPTIONS Pin Names Type AGND/DGND Gnd Analog and digital ground A(TIP) Output Output of A(TIP) power amplifier BGND Gnd Battery (power) ground B(RING) Output Output of B(RING) power amplifier C3–C1 Input Decoder. TTL compatible MSB and C1 ...
Page 5
ABSOLUTE MAXIMUM RATINGS Storage temperature . . . . . . . . . . . . –55°C to +150°C With respect to AGND/DGND ...
Page 6
ELECTRICAL CHARACTERISTICS The Am7945 device is tested under the following conditions unless otherwise noted: BAT = – – 900 . The device is not tested in Polarity Reversal state Description Analog ...
Page 7
ELECTRICAL CHARACTERISTICS (continued) Description Idle Channel Noise (2-Wire and 4-Wire) C-message weighted Psophometric weighted Line Characteristics, Active State (See Figure 1) Short loops, Active state Long loops, Active state OHT state Standby state Loop current I LIM ( ...
Page 8
ELECTRICAL CHARACTERISTICS (continued) Description Supply Currents, BAT = – On-hook supply current On-hook supply current V , BAT On-hook supply current Power-Supply Rejection Ratio (V RIPPLE BAT Effective ...
Page 9
ELECTRICAL CHARACTERISTICS (continued) Description Relay Driver Output (RINGOUT) On voltage Off leakage Zener breakover Zener On voltage RELAY DRIVER SCHEMATIC SWITCHING CHARACTERISTICS (32-Pin PLCC only) Symbol Parameter E1 Low to DET High ( tgkde E1 Low to DET ...
Page 10
SWITCHING WAVEFORMS E1 to DET E1 DET tgkde E0 to DET E1 E0 DET tshdd Note: All delays measured at 1.4 V level. Notes: 1. Unless otherwise noted, test conditions are 35 0.33 ...
Page 11
State Note: E0 High enables DET. Table 2. User-Programmable Components Z = 200 ...
Page 12
DC FEED CHARACTERISTICS V = –51 BAT V = –47.3 V BAT 18.52 k DC1 DC2 DC Notes: 1. Constant-current region: Active state: OHT state: 2. Anti-sat (battery tracking) turn-on: 3. Open ...
Page 13
DC FEED CHARACTERISTICS (continued 1000 DC1 DC2 –47.3 V BAT b. Loop Current vs. Load Resistance (Typical 2000 ...
Page 14
TEST CIRCUITS A(TIP) VTX R L SLIC 2 AGND RSN B(RING log ( L2 Two- to Four-Wire Insertion Loss 1 << R A(TIP ...
Page 15
TEST CIRCUITS (continued) HF GEN 50 1.5 Vrms 80% Amplitude Modulated 100 kHz to 30 MHz V CC A(TIP 600 L B(RING) F. Loop-Detector Switching 200 200 RFI Test ...
Page 16
TEST CIRCUITS (continued) 2.2 nF A(TIP B(RING) 2.2 nF BAT 1700 16 VCC DA VEE DB RD VTX A(TIP) HPA RSN HPB B(RING) RDC RINGOUT AGND/ DGND BGND VBAT DET TMG ...
Page 17
PHYSICAL DIMENSION PL032 .485 .495 .447 .453 .585 Pin 1 I.D. .595 .547 .553 .026 .032 TOP VIEW REVISION SUMMARY Revision • Minor changes were made to the data sheet style and format to conform to AMD ...
Page 18
... The contents of this document are provided in connection with Advanced Micro Devices, Inc. ("AMD") products. AMD 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 speci- fications and product descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any in- tellectual property rights is granted by this publication. Except as set forth in AMD’ ...