73M1906B-IM/F Maxim Integrated Products, 73M1906B-IM/F Datasheet - Page 68

• 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

73M1866B/73M1966B Data Sheet
10.5 Trans-Hybrid Cancellation
In order to improve performance, the Trans-hybrid Cancellation option allows a replica of the transmit
signal to be created within the 73M1x66B and fed back to the RXM pin via an external circuit at the line
interface. With a well matched AC impedance the amount of cancellation achieved is >26 dB. This
function can be enabled or disabled.
10.6 Direct Access Arrangement Control Functions
These Transmit Control Registers contain control information to set up the line side of the 73M1x66B.
Included are DC-IV characteristics, off-hook control, etc.
68
Function
Mnemonic
ACZ
Register
Location
0x16[3:0]
Type
W
Tx Buf
Figure 38: Trans-hybrid Cancellation
Rx Buf
Active Termination Loop
Controls the selection of the active termination loops per the table
shown below. ATEN must be set to 1 for selection to be enabled.
Table 38: DAA Control Functions
+
-
RXM
RXP
ACZ Field
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
TXM
52.3 kΩ
17.4 kΩ
Rn
Rp
Vin
Vin+
-
21 kΩ
Active Termination Loop Setting
600 Ω
900 Ω
270 Ω + 750 Ω || 150 nF and 275 Ω +
780 Ω || 150 nF (ETSI ES 203 021-2)
220 Ω + 820 Ω || 120 nF and 220 Ω +
820 Ω || 115 nF (Australia)
370 Ω + 620 Ω || 310 nF
320 Ω + 1050 Ω || 230 nF
370 Ω + 820 Ω || 110 nF
275 Ω + 780 Ω || 115 nF
120 Ω + 820 Ω || 110 nF
350 Ω + 1000 Ω || 210 nF
200 Ω + 680 Ω || 100 nF (China)
600 Ω + 2.16 µF
900 Ω + 1 µF
900 Ω + 2.16 µF
220 Ω + 400 Ω || 70 nF (China)
270 Ω + 600 Ω || 150 nF (Global
Impedance)
4.7 uF
Description
From the Line
DS_1x66B_001
Rev. 1.6