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PDF TS636I Data sheet ( Hoja de datos )
| Número de pieza | TS636I | |
| Descripción | DIFFERENTIAL VARIABLE GAIN AMPLIFIER FOR ADSL LINE INTERFACE | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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TS636
DIFFERENTIAL VARIABLE GAIN AMPLIFIER
FOR ADSL LINE INTERFACE
s LOW NOISE : 4.7nV/√Hz
s LOW DISTORTION
s HIGH SLEW RATE : 90V/µs
s WIDE BANDWIDTH : 52MHz @ -3dB &
18dB gain
s GAIN PROGRAMMABLE from -9dB to +30dB
with 3dB STEPS
s POWER DOWN FUNCTION
DESCRIPTION
This TS636 is particularly intended for applica-
tions such as preamplification in telecommunica-
tion 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 vari-
able 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.
The gain monotonicity is guaranteed by design.
The TS636 comes in SO-14 plastic packages.
APPLICATION
s Preamplifier with automatic gain control for
Asymmetric Digital Subscriber Line (ADSL).
ORDER CODE
Part Number Temperature Range
TS636I
-40, +85°C
Package
D
•
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
D
SO14
(Plastic Micropackage)
PIN CONNECTIONS (top view)
+Vcc1 1
Input 1 2
Input 2 3
LSB GC1 4
GC2 5
GC3 6
7
MSB GC4
14 +Vcc2
13 Output 1
12 Output 2
11 Power Down
10 -Vcc
9 AGND
8 DGND
January 2001
1/9
1 page  
TS636
BANDWIDTH
The small signal bandwidth is almost constant for gains between +18dB to 0dB and is in the order of
52MHz to 70MHz respectively. For 30dB gain the bandwidth is around 18MHz.
The power bandwidth is typically equal to 30MHz for 2V peak to peak signals.
MAXIMUM INPUT LEVEL
The input level must not exceed the following values :
negative peak value: must be greater than -VCC + 1.5V
positive peak value: must be less than +VCC - 1.5V
For example, if a ±6V power supply is used, the input signal can swing between -4.5V and +4.5V.
These values are due to common mode input range limitations of the input stage of the first amplifier.
Some other limitations may occur, due to the slew rate of the first operational amplifier (typically in the or-
der of 300V/µs). This means that the maximum input signal decreases at high frequency.
SINGLE SUPPLY OPERATION
The incoming signal is AC coupled to the inputs.
The TS636 can be used either with a dual or a single supply. If a single supply is used, the inputs are bi-
ased to the mid supply voltage (+VCC/2). This bias network must be carefully designed, in order to reject
any noise present on the supply rail.
The AGND pin (9) must be connected to +VCC/2. The bias current of the second stage (inverting structure)
is 8µA for both amplifiers. A resistor divider structure can be used. Two resistances should be chosen by
considering 8µA as the 1% of the total current through these resistances. For a single +12V supply volt-
age, two resistances of 7.5kΩ can be used. The differential input consists of a high pass circuit, formed by
the 1µF capacitor and a 1kΩ resistance and gives a break frequency of 160Hz.
SINGLE +12V SUPPLY OF THE TS636
1µF
IN+
1k
12V
47k
1k
10nF
47k
1µF
IN-
1µF
10nF 100nF
+Vcc1 1
TS636
Input 1 2
Input 2 3
GC1 4
GC2 5
GC3 6
GC4 7
14 +Vcc2
12V
13 Output 1 10nF
12 Output 2
100nF 10µF
11 Power Down
10 -Vcc
9 AGND
12V
7.5k
8 DGND
10nF
7.5k
1µF
5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet TS636I.PDF ] | |
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