TS613_02

TS613 DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT s LOW NOISE : 3nV/√Hz, 1.2pA/√Hz s HIGH OUTPUT CURRENT : 200mA s VERY LOW HARMONIC AND INTERMODULATION DISTORTION s HIGH SLEW RATE : 40V/µs s SPECIFIED FOR 25Ω LOAD DESCRIPTION The TS613 is a dual operational amplifier featuring a high output current (200mA min.), large gain-bandwidth product (130MHz) and capable of driving a 25Ω load with a 160mA output current at ±6V power supply. This device is particularly intended for applications where multiple carriers must be amplified simultaneously with very low intermodulation products. The TS613 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) s UPSTREAM line driver for Asymmetric Digital Subscriber Line (ADSL) (NT). ORDER CODE Part Number TS613ID TS613IDW Temperature Range -40, +85°C -40, +85°C Package D • • DW Output1 1 Inverting Input1 2 Non Inverting Input1 3 VCC - 4 _ + _ + 8 VCC + 7 Output2 6 Inverting Input2 5 Non Inverting Input2 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 inExposed-Pad (SO) - also available in Tape & Reel (DWT) December 2002 1/10 TS613 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 4) Unit V V V °C °C °C Differential Input Voltage Input Voltage Range 3) Operating Free Air Temperature Range Storage Temperature Maximum Junction Temperature Output Short Circuit Duration Thermal Resistance Junction to Case Thermal Resistance Junction to Ambient Area 28 175 715 16 60 2000 °C/W °C/W mW °C/W °C/W mW Maximum Power Dissipation (@25°C) SO8 Exposed-Pad Rthjc Thermal Resistance Junction to Case Rthja Pmax. 1. 2. 3. 4. Thermal Resistance Junction to Ambient Area Maximum Power Dissipation (@25°C) All voltages values, except differential voltage are with respect to network terminal. Differential voltages are non-inverting input terminal with respect to the inverting input terminal. The magnitude of input and output voltages must never exceed VCC +0.3V. An output current limitation protects the circuit from transient currents. Short-circuits can cause excessive heating. Destructive dissipation can result from short circuit on amplifiers. OPERATING CONDITIONS Symbol VCC Vicm Supply Voltage Common Mode Input Voltage Parameter Value ±2.5 to ±6 (VCC) +2 to (VCC +) Unit V -1 V 2/10 TS613 ELECTRICAL CHARACTERISTICS Symbol Parameter VCC = ±6V, Tamb = 25°C (unless otherwise specified). Test Condition Tamb Tmin. < Tamb < Tmax. Tamb = 25°C Tamb Tmin. < Tamb < Tmax. Tamb Tmin. < Tamb < Tmax. Vic = ±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 = 25Ω, Tamb Tmin. < Tamb < Tmax. AVCL = +11, f = 20MHz RL = 100Ω AVCL = +7, RL = 50Ω Vid = ±1V, Tamb Tmin. < Tamb < Tmax. RL = 25Ω//15pF RL = 25Ω//15pF f = 100kHz f = 100kHz Vout = 4Vpp, f = 100kHz AVCL = -10 RL = 25Ω//15pF Vout = 4Vpp, f = 100kHz AVCL = -10 Load =25Ω//15pF Vout = 4Vpp, f = 100kHz AVCL = +2 Load =25Ω//15pF Vout = 4Vpp, f = 100kHz AVCL = -10 Load =25Ω//15pF Vout = 4Vpp, f = 100kHz AVCL = +2 Load =25Ω//15pF F1 = 80kHz, F2 = 70kHz Vout = 8Vpp, AVCL = -10 Load = 25Ω//15pF F1 = 80kHz, F2 = 70kHz Vout = 8Vpp, AVCL = -10 Load = 25Ω//15pF Min. -6 Typ. -1 Max 6 10 6 3 5 15 30 Unit DC PERFORMANCE Vio ∆Vio Iio Iib CMR SVR ICC VOH VOL AVD GBP SR Isink Isource ΦM14 ΦM6 en in THD Input Offset Voltage 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 mV mV µA µA dB dB mA V V V/V 0.2 5 90 70 70 50 108 88 11 4 4.5 -4.5 11000 DYNAMIC PERFORMANCE and OUTPUT CHARACTERISTICS -4 6500 5000 80 23 ±200 ±180 Gain Bandwidth Product Slew Rate Output Short Circuit Current Phase Margin at AVCL = 14dB Phase Margin at AVCL = 6dB Equivalent Input Noise Voltage Equivalent Input Noise Current Total Harmonic Distortion 130 40 ±320 60 40 3 1.2 -69 MHz V/µs mA ° ° nV/√Hz pA/√Hz dB NOISE AND DISTORTION HD2-10 2nd Harmonic Distortion -70 dBc HD2+2 2nd Harmonic Distortion -74 dBc HD3-10 3rd Harmonic Distortion -80 dBc HD3+2 3rd Harmonic Distortion -79 dBc IM2-10 2nd Order Intermodulation Product -77 dBc IM3-10 3rd Order Intermodulation Product -77 dBc 3/10 TS613 THERMAL INFORMATION The TS613 is housed in an Exposed-Pad plastic package. As described on the figures below, this package uses a leadframe upon which the dice is mounted. This leadframe is exposed as a thermal pad on the underside of the package. The thermal contact is direct with the dice. This thermal path provide an excellent thermal performance. The thermal pad is electrically isolated from all pins in the package. It can also be soldered to a copper area of the PCB underneath the package. Through these thermal paths within this copper area, heat can be conducted away from the package. In this case, the copper area must be connected to (-Vcc) 3rd ORDER INTERMODULATION Gain=15dB, Vcc=±6V, RL=25Ω, 2 tones 70kHz/ 80kHz 0 -10 -20 -30 IM3 (dBc) -40 -50 -60 -70 -80 -90 -100 1 90kHz 230kHz 60kHz 220kHz 1,5 2 2,5 3 3,5 4 4,5 Vout peak (V) 2nd ORDER INTERMODULATION Gain=15dB, Vcc=±6V, RL=25Ω, 2 tones 180kHz/ 280kHz, Spurious measurement @100kHz DICE -55 Side View Bottom View IM2 (dBc) -60 -65 DICE Cross Section View -70 1,5 2 2,5 3 3,5 4 4,5 Vout peak (V) 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 25Ω. 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. 4/10 3rd ORDER INTERMODULATION Gain=15dB, Vcc=±6V, RL=25Ω, 2 tones 180kHz/ 280kHz 0 -10 -20 -30 IM3 (dBc) -40 -50 -60 -70 -80 -90 -100 1 1,5 2 2,5 3 3,5 4 4,5 80kHz 380kHz 640kHz 740kHz Vout peak (V) TS613 Closed Loop Gain and Phase vs. Frequency Gain=+2, Vcc=±6V, RL=25Ω Closed Loop Gain and Phase vs. Frequency Gain=+6, Vcc=±6V, RL=25Ω 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=25Ω 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=25Ω Channel Separation (Xtalk) vs. Frequency XTalk=20Log(V2/V1), Vcc=±6V, RL=25Ω 5 4 3 2 -20 VIN output -30 -40 -50 -60 -70 -80 + 49.9Ω _ V1 1k Ω 25Ω 100Ω swing (V) 1 0 -1 -2 -3 -4 -5 0 2 input Xtalk (dB) + 49.9Ω _ V2 1k Ω 25Ω 100Ω 4 6 8 10 10kHz 100kHz 1MHz 10MHz Time (µs) Frequency 5/10 TYPICAL APPLICATION : TS613 AS DRIVER FOR ADSL LINE INTERFACES A SINGLE SUPPLY IMPLEMENTATION WITH PASSIVE OR ACTIVE IMPEDANCE MATCHING by C. PRUGNE ADSL CONCEPT Asymmetric Digital Subscriber Line (ADSL), is a new modem technology, which converts the existing twisted-pair telephone lines into access paths for multimedia and high speed data communications. ADSL transmits more than 8 Mbps to a subscriber, and can reach 1Mbps from the subscriber to the central office. ADSL can literally transform the actual public information network by bringing movies, television, video catalogs, remote CD-ROMs, LANs, and the Internet into homes. An ADSL modem is connected to a twisted-pair telephone line, creating three information channels: a high speed downstream channel (up to 1.1MHz) depending on the implementation of the ADSL architecture, a medium speed upstream channel (up to 130kHz) and a POTS (Plain Old Telephone Service), split off from the modem by filters. THE LINE INTERFACE - ADSL Remote Terminal (RT): The Figure1 shows a typical analog line interface used for ADSL. The upstream and downstream signals are separated from the telephone line by using an hybrid circuit and a line transformer. On this note, the accent will be made on the emission path. Figure 1 : Typical ADSL Line Interface high output current digital to emission LP filter analog (analog) The TS613 is used as a dual line driver for the upstream signal. 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 TS613 as a remote terminal transmitter in differential mode. Figure 2 : TS613 as a differential line driver with a +12V single supply 1µ 100n + +12V 1k _ +12V GND R2 12.5 10n Vi 1:2 47k 1/2 R1 Vo Vcc/2 25Ω Vo Hybrid & Transformer 100Ω 1/2 R1 Vi 1k 10µ 47k 100n + _ GND R3 +12V GND 12.5 100n upstream impedance matching HYBRID CIRCUIT digital treatment TS613 Line Driver analog to digital reception (analog) reception circuits twisted-pair telephone line downstream 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 dynamic 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 TS613. If we consider this bias current (5µA) as the 1% of the current through the resistance divider (500µA) to keep a stable mid supply, two 47kΩ 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 6/10 TS613 1µF capacitance provides a path for low frequencies, the 10nF capacitance provides a path for high end of the spectrum. In differential mode the TS613 is able to deliver a typical amplitude signal of 18V peak to peak. The dynamic line impedance is 100Ω. The typical value of the amplitude signal required on the line is up to 12.4V peak to peak. By using a 1:2 transformer ratio the reflected impedance back to the primary will be a quarter (25Ω) and therefore the amplitude of the signal required with this impedance will be the half (6.2 V peak to peak). Assuming the 25Ω series resistance (12.5 Ω for both outputs) necessary for impedance matching, the output signal amplitude required is 12.4 V peak to peak. This value is acceptable for the TS613. In this case the load impedance is 25Ω for each driver. For the ADSL upstream path, a lowpass filter is absolutely necessary to cutoff the higher frequencies from the DAC analog output. In this simple non-inverting amplification configuration, it will be easy to implement a Sallen-Key lowpass filter by using the TS613. 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 figure3 for a differential line. Figure 3 : TS613 as a differential line driver with an active impedance matching 1µ 100n + Vcc+ 1k _ Vcc+ GND Rs1 10n Component calculation: Let us consider the equivalent circuit for a single ended configuration, figure4. Figure 4 : Single ended equivalent circuit + Rs1 Vi _ R2 Vo° Vo -1 R3 1/2R1 1/2RL Let us consider the unloaded system. Assuming the currents through R1, R2 and R3 as respectively: 2 Vi – + -------- , ( Vi Vo ° ) and ( Vi Vo ) - ----------------------------------------------R2 R3 R1 As Vo° equals Vo without load, the gain in this case becomes : 2R2 R2 1 + ---------- + -----Vo ( noload ) R1 R3 G = ------------------------------ = ---------------------------------Vi R2 1 – -----R3 The gain, for the loaded system will be (1): 2R2 R2 1 + ---------- + -----1 R1 R3 Vo ( withload ) GL = ----------------------------------- = -- ---------------------------------- ,( 1 ) 2 R2 Vi 1 – -----R3 As shown in figure5, 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 ) with Ro the synthesized impedance and Iout the output current. On the other hand Vo can be expressed as: 2R2 R2 Vi  1 + ---------- + ------   R 1 R 3 Rs 1 Iout Vo = ---------------------------------------------- – --------------------- ,( 3 ) R2 R2 1 – -----1 – -----R3 R3 Vi 1/2 R1 R2 Vo° Vo 1:n Hybrid & Transformer R3 Vcc/2 RL Vo 100Ω 1/2 R1 R5 Vi 1k 10µ 100n GND + _ R4 Vcc+ GND Vo° Rs2 100n 7/10 TS613 By identification of both equations (2) and (3), the synthesized impedance is, with Rs1=Rs2=Rs: Rs Ro = ---------------- ,( 4 ) R2 1 – -----R3 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) Figure 5 : Equivalent schematic. Ro is the synthesized impedance CAPABILITIES Ro Iout Vi.Gi 1/2RL The table below shows the calculated components for different values of k. In this case R2=1000Ω and the gain=16dB. The last column displays the maximum amplitude level on the line regarding the TS613 maximum output capabilities (18Vpp diff.) and a 1:2 line transformer ratio. Active matching R1 (Ω) 820 490 360 270 240 Passive R3 (Ω) Rs (Ω) TS613 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 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 + 2 Rs 1 k After choosing the k factor, Rs will equal to 1/2RL(k-1). A good impedance matching assumes: 1 R o = -- RL ,( 5 ) 2 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 From (4) and (5) it becomes: 2 Rs R2 ------ = 1 – --------- ,( 6 ) RL R3 MEASUREMENT OF THE POWER CONSUMPTION IN THE ADSL APPLICATION Conditions: Passive impedance matching Transformer turns ratio: 2 Power Supply: 12V Maximun level required on the line: 12.4Vpp Maximum output level of the driver: 12.4Vpp Crest factor: 5.3 (Vp/Vrms) The TS613 power consumption during emission on 900 and 4550 meter twisted pair telephone lines: 360mW By fixing an arbitrary value for R2, (6) gives: R2 R 3 = ------------------2 Rs 1 – --------RL Finally, the values of R2 and R3 allow us to extract R1 from (1), and it comes: 2R2 R 1 = --------------------------------------------------------- ,( 7 ) R 2 R2 2  1 – ------ GL – 1 – ----- R 3 R3 with GL the required gain. 8/10 TS613 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 9/10 TS613 PACKAGE MECHANICAL DATA 8 PINS - PLASTIC MICROPACKAGE (SO Exposed-Pad) Millimeters Dim. Min. A A1 A2 B C D D1 E E1 e H h L k ddd 1.350 0.000 1.100 0.330 0.190 4.800 3.10 3.800 2.41 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 4.000 0.150 Typ. Max. 1.750 0.250 1.650 0.510 0.250 5.000 Min. 0.053 0.001 0.043 0.013 0.007 0.189 Inches Typ. Max. 0.069 0.010 0.065 0.020 0.010 0.197 0.122 0.157 0.095 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 © 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 10/10