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TS635
DUAL WIDE BAND OPERATIONAL AMPLIFIER FOR ADSL LINE INTERFACE
s LOW NOISE : 3.2nV/Hz, 1.5pA/Hz s HIGH OUTPUT CURRENT : 160mA min. s VERY LOW HARMONIC AND INTERMODULATION DISTORTION
s HIGH SLEW RATE : 40V/s s SPECIFIED FOR 25 LOAD
DESCRIPTION This device is particularly intended for applications where multiple carriers must be amplified simultaneously with very low intermodulation products. It has been mainly designed to fit with ADSL chip-set such as ST70134 or ST70135. The TS635 is a high output current dual operational amplifier, with a large gain-bandwidth product (130MHz) and capable of driving a 25 load at 12V power supply. The TS635 is fitted out with Power Down function in order to decrease the consumption. The TS635 is housed in a SO8 plastic package and a SO8 Exposed-Pad plastic package. APPLICATION
D SO8 (Plastic Micropackage)
DW SO8 Exposed-Pad (Plastic Micropackage)
PIN CONNECTIONS (top view)
Output1 1 Inverting Input1 2 Non Inverting Input1 3 VCC - 4 _ + _ +
8 VCC + 7 Output2 6 Inverting Input2 5 Non Inverting Input2
s UPSTREAM line driver for Asymmetric Digital
Subscriber Line (ADSL) (NT). ORDER CODE
Part Number TS635ID TS635IDW Temperature Range -40, +85C -40, +85C Package D * * DW
Cross Section View Showing Exposed-Pad This pad can be connected to a (-Vcc) copper area on the PCB
D = Small Outline Package (SO) - also available in Tape & Reel (DT) DW = Small Outline Package in Exposed-Pad (SO) - also available in Tape & Reel (DWT)
December 2002
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TS635
ABSOLUTE MAXIMUM RATINGS
Symbol VCC Vid Vin Toper Tstd Tj SO8 Rthjc Rthja Pmax. Supply voltage
1) 2)
Parameter
Value 7 2 6 -40 to + 85 -65 to +150 150 28 175 715 16 60 2000
Unit V V V C C C C/W C/W mW C/W C/W mW
Differential Input Voltage Input Voltage Range
3)
Operating Free Air Temperature Range TS635ID Storage Temperature Maximum Junction Temperature Thermal Resistance Junction to Case Thermal Resistance Junction to Ambient Area
Maximum Power Dissipation (@25C) SO8 Exposed-Pad Rthjc Thermal Resistance Junction to Case Rthja Pmax. Thermal Resistance Junction to Ambient Area Maximum Power Dissipation (@25C)
1. All voltages values, except differential voltage are with respect to network terminal. 2. Differential voltages are non-inverting input terminal with respect to the inverting input terminal. 3. The magnitude of input and output voltages must never exceed VCC +0.3V.
OPERATING CONDITIONS
Symbol VCC Vicm Supply Voltage Common Mode Input Voltage Parameter Value 2.5 to 6 (VCC) +2 to (VCC+) -1 Unit V V
APPLICATION: ADSL LINE INTERFACE
ASCOT ADSL CHIP-SET
TX
emission LP filter (analog signal)
TS635 Line Driver
upstream
ST70135
ST70134
Power Down
HYBRID CIRCUIT
RX
reception (analog signal)
twisted-pair telephone line
VGA
downstream
TS636 Receiver
4-bit Gain Control
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TS635
ELECTRICAL CHARACTERISTICS.
Symbol Parameter Differential Input Offset Voltage Input Offset Current Input Bias Current Common Mode Rejection Ratio Supply Voltage Rejection Ratio Total Supply Current per Operator High Level Output Voltage Low Level Output Voltage Large Signal Voltage Gain
VCC = 6V, Tamb = 25C (unless otherwise specified).
Test Condition Tamb = 25C Tamb Tmin. < Tamb < Tmax. Tamb Tmin. < Tamb < Tmax. Vic = 2V to 2V, Tamb Tmin. < Tamb < Tmax. Vic = 6V to 4V, Tamb Tmin. < Tamb < Tmax. No load, Vout = 0 Iout = 160mA, RL to GND Iout = 160mA, RL to GND Vout = 7V peak RL = 25, Tamb Tmin. < Tamb < Tmax. AVCL = +7, f = 20MHz RL = 100 AVCL = +7, RL = 50 Vid = 1V, Tamb Tmin. < Tamb < Tmax. RL = 25//15pF RL = 25//15pF f = 100kHz f = 100kHz Vout = 4Vpp, f = 100kHz AVCL = -10 RL = 25//15pF F1 = 80kHz, F2 = 70kHz Vout = 8Vpp, AVCL = -10 Load = 25//15pF F1 = 80kHz, F2 = 70kHz Vout = 8Vpp, AVCL = -10 Load = 25//15pF 90 70 70 50 Min. Typ. Max 6 3 5 15 30 Unit mV A A dB dB 15 mA V -4 V V/V
DC PERFORMANCE
Vio
Iio Iib CMR SVR ICC VOH VOL AVD GBP SR Iout Isink Isource M14 M6 en in THD 0.2 5 108 88 11 4 4.5 -4.5 6500 5000 130 23 160 140 60 40 3.2 1.5 -69 40 240 MHz V/s mA mA nV/Hz pA/Hz dB 11000
DYNAMIC PERFORMANCE
Gain Bandwidth Product Slew Rate Output Short Circuit Current Output Current Phase Margin at AVCL = 14dB Phase Margin at AVCL = 6dB Equivalent Input Noise Voltage Equivalent Input Noise Current Total Harmonic Distorsion
NOISE AND DISTORTION
IM2-10
2nd Order Intermodulation Product
-77
dBc
IM3-10
3rd Order Intermodulation Product
-77
dBc
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TS635
INTERMODULATION DISTORTION The curves shown below are the measurements results of a single operator wired as an adder with a gain of 15dB. The operational amplifier is supplied by a symmetric 6V and is loaded with 25. Two synthesizers (Rhode & Schwartz SME) generate two frequencies (tones) (70 & 80kHz ; 180 & 280kHz). An HP3585 spectrum analyzer measures the spurious level at different frequencies. The curves are traced for different output levels (the value in the X ax is the value of each tone). The output levels of the two tones are the same. The generators and spectrum analyzer are phase locked to enhance measurement precision. 3rd ORDER INTERMODULATION Gain=15dB, Vcc=6V, RL=25, 2 tones 70kHz/ 80kHz 3rd ORDER INTERMODULATION Gain=15dB, Vcc=6V, RL=25, 2 tones 180kHz/ 280kHz
0 -10 -20
0 -10 -20 -30
IM3 (dBc)
-30
IM3 (dBc)
-40 -50 -60 -70 -80 -90 -100 1
-40 -50 -60 -70 -80
80kHz 380kHz
90kHz 230kHz
60kHz 220kHz
1,5 2 2,5 3 3,5 4 4,5
640kHz 740kHz
-90 -100 1 1,5 2 2,5
3
3,5
4
4,5
Vout peak (V)
Vout peak (V)
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TS635
Closed Loop Gain and Phase vs. Frequency Gain=+2, Vcc=6V, RL=25 Closed Loop Gain and Phase vs. Frequency Gain=+6, Vcc=6V, RL=25
10
200
20
200
Gain
15 0 100 Phase (degrees) 10
Gain
100 Phase (degrees)
Gain (dB)
-10
Phase
Gain (dB)
5
Phase
0 -5 0
0
-20
-100
-10 -15
-100
-30
-200
-20
-200
10kHz
100kHz
1MHz
10MHz
100MHz
10kHz
100kHz
1MHz
10MHz
100MHz
Frequency
Frequency
Closed Loop Gain and Phase vs. Frequency Gain=+11, Vcc=6V, RL=25
Equivalent Input Voltage Noise Gain=+100, Vcc=6V, no load
30
200
20
Gain
20 100
15 en (nV/VHz)
+ _
10k
10
Phase
0 0
Phase (degrees)
Gain (dB)
10
100
-10 -20 -30
-100
5
-200
0 100Hz 1kHz 10kHz 100kHz 1MHz Frequency
10kHz
100kHz
1MHz 10MHz Frequency
100MHz
Maximum Output Swing Vcc=6V, RL=25
Channel Separation (Xtalk) vs. Frequency XTalk=20Log(V2/V1), Vcc=6V, RL=25
5 4 3 2
-20
VIN
output
-30 -40 -50 -60 -70 -80
+ 49.9 _
V1
1k 25
100
swing (V)
1 0 -1 -2 -3 -4 -5 0 2
input
Xtalk (dB)
+ 49.9 _
V2
1k 25
100
4
6
8
10
10kHz
100kHz
1MHz
10MHz
Time (s)
Frequency
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TS635
THE TS635 AS LINE DRIVER ON ADSL LINE INTERFACE. SINGLE SUPPLY IMPLEMENTATION WITH PASSIVE OR ACTIVE IMPEDANCE MATCHING. THE LINE INTERFACE - ADSL Remote Terminal (RT): The Figure1 shows a typical analog line interface used for ADSL service. On this note, the accent will be made on the emission path. The TS635 is used as a dual line driver for the upstream signal. Figure 1 : Typical ADSL Line Interface namic range between 0 and +12 V. Several options are possible to provide this bias supply (such as a virtual ground using an operational amplifier), such as a two-resistance divider which is the cheapest solution. A high resistance value is required to limit the current consumption. On the other hand, the current must be high enough to bias the inverting input of the TS635. If we consider this bias current (5A) as the 1% of the current through the resistance divider (500A) to keep a stable mid supply, two 47k resistances can be used. The input provides two high pass filters with a break frequency of about 1.6kHz which is necessary to remove the DC component of the input signal. To avoid DC current flowing in the primary of the transformer, an output capacitor is used. The this case the load impedance is 25 for each driver.
HYBRID CIRCUIT
ASCOT ADSL Chip-Set
emission (analog)
high output current
LP filter
upstream impedance matching
ST70135
ST70134
TS635 Line Driver
twisted-pair telephone line
reception (analog)
VGA
TS636 Receiver
downstream
For the ADSL upstream path necessary to avoid any distortion. In this simple non-inverting amplification configuration, it will be easy to implement a Sallen-Key lowpass filter by using the TS635. For ADSL over POTS, a maximum frequency of 135kHz is reached. For ADSL over ISDN, the maximum frequency will be 276kHz. INCREASING THE LINE LEVEL BY USING AN ACTIVE IMPEDANCE MATCHING With passive matching, the output signal amplitude of the driver must be twice the amplitude on the load. To go beyond this limitation an active maching impedance can be used. With this technique it is possible to keep good impedance matching with an amplitude on the load higher than the half of the ouput driver amplitude. This concept is shown in Figure 3 for a differential line. Figure 3 : TS635 as a differential line driver with an active impedance matching
For the remote terminal it is required to create an ADSL modem easy to plug in a PC. In such an application, the driver should be implemented with a +12 volts single power supply. This +12V supply is available on PCI connector of purchase. The Figure 2 shows a single +12V supply circuit that uses the TS635 as a remote terminal transmitter in differential mode. Figure 2 : TS635 as a differential line driver with a +12V single supply
1 100n + +12V 1k _ +12V GND R2 12.5 10n
Vi
1:2
47k
1/2 R1
Vo
Vcc/2
1
25 Vo
Hybrid & Transformer
100n
100
Vcc+ 1k
+ _
Vcc+ GND
Rs1
10n
1/2
R1
Vi
1k
10
47k 100n + _
GND
R3 +12V
GND
Vi
1/2 R1
R2
Vo Vo
1:n
Hybrid & Transformer
12.5
R3 Vcc/2
RL Vo
100
100n
1/2 R1
R5
Vi
1k
10
100n
GND
+ _
R4 Vcc+
GND
Vo
Rs2
The driver is biased with a mid supply (nominaly +6V), in order to maintain the DC component of the signal at +6V. This allows the maximum dy6/10
100n
TS635
Component calculation: Let us consider the equivalent circuit for a single ended configuration, Figure 4. Figure 4 : Single ended equivalent circuit By identification of both equations (2) and (3), the synthesized impedance is, with Rs1=Rs2=Rs:
Rs Ro = ---------------- ,( 4 ) R2 1 - -----R3
+
Rs1 Vi
Figure 5 : Equivalent schematic. Ro is the synthesized impedance
_
R2
Vo
Vo
-1
R3
1/2R1 1/2RL
Ro
Iout
Vi.Gi
1/2RL
Let us consider the unloaded system. Assuming the currents through R1, R2 and R3 as respectively:
2Vi - + -------- , ( Vi Vo ) and ( Vi Vo ) - ----------------------------------------------R1 R2 R3
As Vo equals Vo without load, the gain in this case becomes :
2R2 R2 1 + ---------- + -----R1 R3 Vo ( noload ) G = ------------------------------ = ---------------------------------R2 Vi 1 - -----R3
Unlike the level Vo required for a passive impedance, Vo will be smaller than 2Vo in our case. Let us write Vo=kVo with k the matching factor varying between 1 and 2. Assuming that the current through R3 is negligeable, it comes the following resistance divider:
kVoRL Ro = --------------------------RL + 2Rs1
The gain, for the loaded system will be (1):
2R2 R2 1 + ---------- + -----1 Vo ( withload ) R1 R3 ----------------------------------- = -- ---------------------------------- ,( 1 ) GL = 2 R2 Vi 1 - -----R3
After choosing the k factor, Rs will equal to 1/2RL(k-1). A good impedance matching assumes:
1 R o = -- RL ,( 5 ) 2
As shown in Figure 5, this system is an ideal generator with a synthesized impedance as the internal impedance of the system. From this, the output voltage becomes:
Vo = ( ViG ) - ( RoIout ) ,( 2 )
From (4) and (5) it becomes:
2Rs R2 ------ = 1 - --------- ,( 6 ) R3 RL
with Ro the synthesized impedance and Iout the output current. On the other hand Vo can be expressed as:
2R2 R2 Vi 1 + ---------- + ------ R1 R3 Rs1Iout Vo = ---------------------------------------------- - --------------------- ,( 3 ) R2 R2 1 - -----1 - -----R3 R3
By fixing an arbitrary value for R2, (6) gives:
R2 R3 = ------------------2Rs 1 - --------RL
Finally, the values of R2 and R3 allow us to extract R1 from (1), and it comes:
2R2 R1 = --------------------------------------------------------- ,( 7 ) R2 R2 2 1 - ------ GL - 1 - ----- R3 R3
with GL the required gain.
GL (gain for the loaded system) R1 R2 (=R4) R3 (=R5) Rs GL is fixed for the application requirements GL=Vo/Vi=0.5(1+2R2/R1+R2/R3)/(1-R2/R3) 2R2/[2(1-R2/R3)GL-1-R2/R3] Abritrary fixed R2/(1-Rs/0.5RL) 0.5RL(k-1)
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TS635
CAPABILITIES The table below shows the calculated components for different values of k. In this case R2=1000 and the gain=16dB. The last column displays the maximum amplitude level on the line regarding the TS635 maximum output capabilities (18Vpp diff.) and a 1:2 line transformer ratio.
Active matching R1 () 820 490 360 270 240 Passive R3 () Rs () TS635 Output Level to get 12.4Vpp on the line (Vpp diff) 8 8.7 9.3 9.9 10.5 12.4 Maximum Line level (Vpp diff) 27.5 25.7 25.3 23.7 22.3 18
MEASUREMENT OF THE POWER CONSUMPTION Conditions: Power Supply: 12V Passive impedance matching Transformer turns ratio: 2 Maximun level required on the line: 12.4Vpp Maximum output level of the driver: 12.4Vpp Crest factor: 5.3 (Vp/Vrms) The TS635 power consumption during emission on 900 and 4550 meter twisted pair telephone lines: 360mW
k
1.3 1.4 1.5 1.6 1.7
1500 3.9 1600 5.1 2200 6.2 2400 7.5 3300 9.1 matching
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TS635
PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (SO)
Millimeters Dim. Min. A a1 a2 a3 b b1 C c1 D E e e3 F L M S 0.1 0.65 0.35 0.19 0.25 4.8 5.8 1.27 3.81 3.8 0.4 4.0 1.27 0.6 8 (max.) 0.150 0.016 Typ. Max. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45 (typ.) 5.0 6.2 0.189 0.228 Min. 0.004 0.026 0.014 0.007 0.010
Inches Typ. Max. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.197 0.244 0.050 0.150 0.157 0.050 0.024
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TS635
PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (SO Exposed-Pad)
Millimeters Dim. Min. A A1 A2 B C D E e H h L k ddd 1.350 0.000 1.100 0.330 0.190 4.800 3.800 1.270 5.800 0.250 0.400 0d 6.200 0.500 1.270 8d 0.100 0.228 0.010 0.016 0d Typ. Max. 1.750 0.250 1.650 0.510 0.250 5.000 4.000 Min. 0.053 0.001 0.043 0.013 0.007 0.189 0.150
Inches Typ. Max. 0.069 0.010 0.065 0.020 0.010 0.197 0.157 0.050 0.244 0.020 0.050 8d 0.004
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 2002 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom http://www.st.com
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