THS6062IDR Datasheet, PDF (18/36 Pages) Texas Instruments – LOW-NOISE ADSL DUAL DIFFERENTIAL RECEIVER

THS6062
SLOS228D – JANUARY 1999 – REVISED OCTOBER 2007
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One client-side terminal circuit implementation, shown in Figure 40, uses a 1:2 transformer ratio. While creating a
power and output voltage advantage for the line drivers, the 1:2 transformer ratio reduces the SNR for the
received signals. The ADSL standard, ANSI T1.413, stipulates a noise power spectral density of –140 dBm/Hz,
which is equivalent to 31.6 nV/√Hz for a 100-Ω system. Although many amplifiers can reach this level of
performance, actual ADSL system testing has indicated that the noise power spectral density may typically be ≤
–150 dBm/Hz, or ≤ 10 nV/√Hz. With a transformer ratio of 1:2, this number reduces to less than 5 nV/√Hz. The
THS6062, with an equivalent input noise of 1.6 nV/√Hz, is an excellent choice for this application. Coupled with a
very low 1.2 pA/√Hz equivalent input current noise and low value resistors, the THS6062 will ensure that the
received signal SNR will be as high as possible.
6V
THS6022
Driver 1
V_I+
+
_
0.1 mF
+
6.8 mF
1 kΩ
−6 V
1 kΩ
0.1 mF
6.8 mF
+
12.5 Ω
1:2
Telephone Line
100 Ω
6V
THS6022
Driver 2
V_I−
+
_
0.1 mF
+
6.8 mF
1 kΩ
−6 V
1 kΩ
0.1 mF
6.8 mF
+
Driver Block
12.5 Ω
1 kΩ
499 Ω
1 kΩ
499 Ω
499 Ω
−
+
THS6062
V_O+
Receiver 1
499 Ω
6V
0.1 mF
−
+ _THS6062
V_O−
Receiver 2
−6 V
0.01 mF
Receiver Block
Figure 40. THS6062 Client-Side ADSL Application
18
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