73M1866B-IFX Maxim Integrated Products, 73M1866B-IFX Datasheet - Page 58
73M1866B-IFX
Manufacturer Part Number
73M1866B-IFX
Description
KIT EVALUATION FOR 73M1866B
Manufacturer
Maxim Integrated Products
Specifications of 73M1866B-IFX
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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73M1866B/73M1966B Data Sheet
Note 1. Tx Data is assumed small enough that the combination of Tx Data and TXDG is less than 1.25 dBm.
8.8.1.2 Receive Gain Scaling
On the receive side, a 0 dBm receive signal on the line results in ~0 dBm at the PCM interface.
Means is provided to adjust receive signal path gain by use of a digital gain stage. This gain value is
controlled by Register 0x09[7:0] (RXDG). The gain values are explained in Table 33.
The two RXG bits (Register 0x14[1:0]) control the value of the receiver analog gain. The RXG bits must
be set to 10 to enable 0 dB gain in the receive path.
For the best S/N performance it is recommended to use a gain value up front in the analog domain. The
digital control should be used to fine-tune the receiver signal path gain.
58
When the received line signal exceeds a voltage level greater than specified by ITU-T
Recommendation G.711, the receive gain must be reduced to prevent saturation and clipping within
the receive signal processing path.
TX Level
Note (1)
Note (1)
Note (1)
Note (1)
Note (1)
Note (1)
dBm
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
TxBst DAA1 DAA0 dB
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
1
1
1
1
1
1
1
1
Analog Gain
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
1
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
-8
-8
-8
-8
-8
-8
-8
-8
-8
-8
-8
-4
-4
-4
-4
-2
0
0
0
2
3
3
6
6
6
6
6
6
6
6
1001_1010
1010_0110
1010_1110
0100_0010
0100_1010
0101_0010
0101_1010
0110_0110
0110_1110
0000_0010
0000_1010
0110_0110
0110_1110
0000_0010
0000_1010
0000_0010
0110_1110
0000_0010
0000_1010
0000_0010
0000_0010
0000_1010
0110_1110
0000_0010
0000_1010
0001_0010
0001_1010
0010_0110
0010_1110
0011_0110
TXDG
Digital Gain
-8.75
-7.75
-6.75
-5.75
-4.75
-3.75
-2.75
-1.75
-0.75
-1.75
-0.75
-0.75
-0.75
0.25
1.25
0.25
1.25
0.25
0.25
1.25
0.25
0.25
1.25
0.25
1.25
2.25
3.25
4.25
5.25
6.25
dB
Ana+Dig
-16.75
-15.75
-14.75
-13.75
-12.75
-11.75
-10.75
10.25
11.25
12.25
-9.75
-8.75
-7.75
-6.75
-5.75
-4.75
-3.75
-2.75
-1.75
-0.75
0.25
1.25
2.25
3.25
4.25
5.25
6.25
7.25
8.25
9.25
dB
DS_1x66B_001
Rev. 1.6
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