ml7012-04 Oki Optical Components, ml7012-04 Datasheet - Page 20

• Manufacturer Part Number: ml7012-04
• Description: 2400 Single Chip Full Duplex Data Modem With Protocol
• Manufacturer: Oki Optical Components

Examples of Level Diagram
Connection of Crystal Oscillator
Connect a 11.0592 MHz crystal unit and a 1 M feedback resistor between OSC0 and OSC1.
The values of capacitors C
capacitance of the crystal unit and the wiring capacitance of the board. Set the values by the crystal manufacture’s
matching evaluation.
If an external clock is used, input it to OSC0.
1 Semiconductor
(1) Modem transmit: V
(2) DTMF transmit: V
(3) Modem transmit: V
(4) DTMF transmit: V
(5) Maximum modem receive:
(6) Minimum modem receive
AOUT = –20 dBm, RCAO = –20 dBm, TXAN = –14 dBm, TXAP = –14 dBm, LINE = –16 dBm
(S34 = 2 dB (initial value), R5/R4 = 2, transformer loss = 2 dB)
The low group levels are approximately 1 dB smaller than the values below.
AOUT = –14.5 dBm, RCAO = –14.5dBm, TXAN = –8.5 dBm, TXAP = –8.5 dBm, LINE = –10.5 dBm
(S35 = 0 dB (initial value), R5/R4 = 2, transformer loss = 2 dB)
AOUT = –20 dBm, RCAO = –20 dBm, TXAN = –15.9 dBm, TXAP = –15.9 dBm, LINE = –17.9 dBm
(S34 = 2 dB (initial value), R5/R4 = 1.6, transformer loss = 2 dB)
The low group levels are approximately 1 dB smaller than the values below.
AOUT = –14.5 dBm, RCAO = –14.5 dBm, TXAN = –10.4 dBm, TXAP = –10.4 dBm, LINE = –12.4 dBm
(S35 = 0 dB (initial value), R5/R4 = –1.6, transformer loss 2 dB)
LINE = –9 dBm, connecting point of R6, and R7 = –11 dBm, GSR = –15 dBm
(R8/R7 = 0.63 = –4 dB, transformer loss = 2 dB)
LINE = –40 dBm, connecting point of R6 and R7 = –42 dBm, GSR = –46 dBm
(R8/R7 = 0.63 = –4 dB, transformer loss = 2 dB)
11.0592 MHz
15 pF
C
15 pF
DD
DD
C
01
01
DD
DD
02
and C
3 V: high group level
2.7 V: high group level
3 V
2.7 V
02
connected between OSC0 and GND, and OSC1 and GND vary with the load
1 M
R
OSC
OSC1
OSC0
FEDL 7012-04-01
ML7012-04
20/22