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TS636IDT View Datasheet(PDF) - STMicroelectronics

Part NameTS636IDT ST-Microelectronics
STMicroelectronics ST-Microelectronics
DescriptionDIFFERENTIAL VARIABLE GAIN AMPLIFIER FOR ADSL LINE INTERFACE
TS636IDT Datasheet PDF : 9 Pages
1 2 3 4 5 6 7 8 9
TS636
GAIN CONTROL
The gain and the power down mode is programmed with a 4 bit digital word :
Digital
Control
GC4....GC1
MSB LSB
$0000
$0001
$0010
$0011
$0100
$0101
$0110
$0111
$1000
$1001
$1010
$1011
$1100
$1101
$1110
$1111
Total Gain
(dB)
-9
-6
-3
0
3
6
9
12
15
18
21
24
27
30
30
30
First Stage
Gain
(dB)
Second Stage
Gain
(dB)
Maximum
Input Level
Bandwidth
Small Signal
0
-9
2.8Vrms
110MHZ
0
-6
2.8Vrms
100MHz
0
-3
2.8Vrms
85MHz
0
0
2.8Vrms
69MHz
3
0
2Vrms
63MHz
6
0
1.4Vrms
58MHz
9
0
1Vrms
56MHz
12
0
0.7Vrms
55MHz
15
0
0.5Vrms
54MHz
18
0
0.35Vrms
52MHz
21
3
0.25Vrms
42MHz
24
6
175mVrms
30MHz
27
9
125mVrms
24MHz
30
12
88mVrms
18MHz
30
12
88mVrms
18MHz
30
12
88mVrms
18MHz
Eq. Input
Noise
(nV/Hz)
29
26
23
22
16
12
9
7
6
4.8
4.7
4.7
4.6
4.6
4.6
4.6
The gain is the same for both channels.
The digital inputs are CMOS compatible. The supply voltage of the logic decoder used to transcode the digital word can be either 3.3V or 5V or VCC.
6/9
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DESCRIPTION
This TS636 is particularly intended for applications such as preamplification in telecommunication systems using multiple carriers. It has been minly designed to fit with ADSL chip-sets such as ASCOT ADSL chip-set for CPE.
The TS636 is a differential digitally controled variable gain amplifier featuring a high slew rate of 90V/µs, a large bandwidth, a very low distortion and a very low current and voltage noise.
The gain can be set from -9dB to +30dB through a 4bit digital word, with 3dB steps.

■ LOW NOISE : 4.7nV/√Hz
■ LOW DISTORTION
■ HIGH SLEW RATE : 90V/µs
■ WIDE BANDWIDTH : 52MHz @ -3dB & 18dB gain
■ GAIN PROGRAMMABLE from -9dB to +30dB with 3dB STEPS
■ POWER DOWN FUNCTION

APPLICATION
■ Preamplifier with automatic gain control for Asymmetric Digital Subscriber Line (ADSL).

 

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