73M1906B-IM/F Maxim Integrated Products, 73M1906B-IM/F Datasheet - Page 59

• Manufacturer Part Number: 73M1906B-IM/F
• Description: Interface - Specialized DAA-FXO VolP SYSTEM HOST SIDE
• Manufacturer: Maxim Integrated Products
• Type: MicroDAA with PCM Highwayr

Specifications of 73M1906B-IM/F

• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: TSSOP-20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS_1x66B_001
Table 36 lists the value of Receive Gain for each value of RXG.
The precise values of the digital gain settings are:
8.8.1.3 Maximum Levels
The 73M1x66B is capable of providing gain attenuation in both the digital and analog domain. It is important
to note that for optimum performance the transmitter output and receiver input should not exceed more than
+7.25 dBm. Signal levels that are greater than this will cause distortion and reduced performance.
This implies that the maximum input signal capable by the transmitter, if adjusted for unity gain, is the
+7.25 dBm, e.g. digital gain of -6.0 dB (ensures analog input is less than +1.25 dBm) and analog gain of
+6 dB gives +7.25 dBm.
8.8.2 Time Slot Assignment Example
Figure 31 shows an example of the timing of transmit and receive time slots with changes in the time slot,
clock slot and edge controls. Refer to Section 8.8, PCM Control Functions.
To program the first transmit time slot after FS, TTC=31, TCS=7 and TPOL=1:
•
•
Rev. 1.6
Gain / Attenuation
Figure 31: Timing Relationships with Various TTS, TCS, TPOL, and RTS, RCS, RPOL Settings
The first receive time slot after FS would be RTS=31, RCS=7 and RPOL=0.
Adjustments of ½ clock period can be made using these registers.
Gain
Bit
PCLK
DX
DX
DR
DR
FS
-12.04dB
0.25
7
-6.02dB
Table 36: Receive Gain Control
0.5
0x14[1]
RXG1
6
0
0
1
1
RTS, RCS = 31, 7
TTS, TCS = 31, 7
RPOL=1
TPOL=0
3.52dB
1.5
RTS, RCS = 31, 7
5
0x14[0]
TTS, TCS = 31, 7
RXG0
RPOL=0
TPOL=1
0
1
0
1
RTS, RCS = 0, 0
1.94dB
TTS, TCS = 0, 0
1.25
RPOL=1
4
TPOL=0
Gain Nom
RTS, RCS = 0, 0
(dB)
+3.0
-6.0
-3.0
0.0
TTS, TCS = 0, 0
RPOL=0
1.02dB
TPOL=1
1.125
3
73M1866B/73M1966B Data Sheet
1.0625
0.53dB
2
1.03125 1.015625
0.27dB
1
0.13dB
0
59