ISL1571 Data Sheet September 3, 2009 FN6387.1 Power Line Communication (PLC) Features The ISL1571 is a dual operational amplifier designed for PLC line driving in OFDM and SSC based solutions. This device features a high drive capability of 750mA while consuming only 6mA of supply current per amplifier and operating from a single 4.5V to 12V supply. The driver achieves a typical distortion of -80dBc, at 150kHz into a 25Ω load. • 21dBm output power capability The ISL1571 is available in the thermally-enhanced 16 Ld QFN or 10 Ld HMSOP package and is specified for operation over the full -40°C to +85°C temperature range. The ISL1571 has control pins BIAS0 and BIAS1 for controlling the bias and enable/disable of the outputs. These controls allow for lowering the power to fit the performance/power ratio for the application. • -80dBc typical driver output distortion at 10MHz The ISL1571 is ideal for line driving applications following the Homeplug 1.0, Homeplug AV and UPA standard based PLC. • 250MHz bandwidth • Drives up to 750mA from a +12V supply • 20VP-P differential output drive into 21Ω • Very low noise floor • -75dBc typical driver output distortion at 4MHz • -79dBc typical driver output distortion at 17MHz • Low quiescent current of 6mA per amplifier • Supply range - For ISL1571IUEZ 4.5V to 12V - For ISL1571IRZ ±2.25V to ±6V, 4.5V to 12V • Thermal shutdown • Pb-free (RoHS compliant) Applications • Homeplug 1.0 • Homeplug AV • UPA digital home standard Ordering Information PART NUMBER (Note) PART MARKING TEMP. RANGE (°C) PACKAGE (Pb-Free) PKG. DWG. # ISL1571IRZ 157 1IRZ -40 to +85 16 Ld QFN MDP0046 ISL1571IRZ-T7* 157 1IRZ -40 to +85 16 Ld QFN (Tape and Reel) MDP0046 ISL1571IUEZ BBBDA -40 to +85 10 Ld HMSOP MDP0050 ISL1571IUEZ-T7* BBBDA -40 to +85 10 Ld HMSOP (Tape and Reel) MDP0050 *Please refer to TB347 for details on reel specifications NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2008, 2009. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. ISL1571 Pinouts NC VS+ OUTB ISL1571 (10 LD HMSOP) TOP VIEW OUTA ISL1571 16 LD QFN TOP VIEW VS+ 1 16 15 14 13 NC 2 NC 1 12 NC INA- 2 11 INB- INA+ 3 GND 4 VS-* OUTA 3 10 INB+ 6 7 8 NC NC VS- BIAS0 9 INB8 INB+ INA- 4 7 BIAS1 INA+ 5 6 BIAS0 BIAS1 9 5 VS-* 10 OUTB *THERMAL PAD MUST BE CONNECTED TO NEGATIVE SUPPLY: VS-. QFN PACKAGE CAN BE USED IN SINGLE AND DUAL SUPPLY APPLICATIONS. *THERMAL PAD MUST BE CONNECTED TO NEGATIVE SUPPLY: VS-. HMSOP PACKAGE CAN BE USED IN SINGLE SUPPLY APPLICATIONS ONLY. Pin Descriptions 16 LD QFN 10 LD HMSOP PIN NAME FUNCTION 1, 5, 6, 12, 15 2 NC No Connect 2 4 INA- Inverting Input of Amplifier A 3 5 INA+ Non-Inverting Input of Amplifier A 4 Thermal Pad GND Ground Connect 7 Thermal Pad VS- Negative Supply 8 6 BIAS0 (Note 1) Current Control Bias Pin 9 7 BIAS1 (Note 1) Current Control Bias Pin 10 8 INB+ Non-Inverting Input of Amplifier B 11 9 INB- Inverting Input of Amplifier B 13 10 OUTB 14 1 VS+ 16 3 OUTA Output of Amplifier B Positive Supply Output of Amplifier A NOTE: 1. Single DSL port is comprised of amplifiers A and B. BIAS0 and BIAS1 control IS settings for the DSL port. 2 FN6387.1 September 3, 2009 ISL1571 pplications Information Absolute Maximum Ratings (TA = +25°C) Thermal Information VS+ Voltage to Ground . . . . . . . . . . . . . . . . . . . . . . -0.3V to +13.2V VIN+ Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND to VS+ Current into any Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8mA Continuous Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 75mA BIAS0, BIAS1 to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6.6V ESD Rating Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1kV* Charge Device Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5kV Ambient Operating Temperature Range . . . . . . . . . .-40°C to +85°C Storage Temperature Range . . . . . . . . . . . . . . . . . .-60°C to +150°C Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +150°C Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . .see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp *Excludes C0 and C1 pins which show less than 1kV of HBM ESD sensitivity. CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and result in failures not covered by warranty. IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA Electrical Specifications PARAMETER VS = 12V, RF = 750Ω, RL-DIFF = 50Ω, BIAS0 = BIAS1 = 0V, TA = +25°C, unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP MAX UNIT AC PERFORMANCE RF = 750Ω, AV = +5 250 MHz RF = 750Ω, AV = +10 200 MHz -75 dBc -80 dBc BW -3dB Bandwidth THD Total Harmonic Distortion, Differential f = 4MHz, VO = 4VP-P_DIFF, RL-DIFF = 100Ω f = 10MHz, VO = 4VP-P_DIFF, RL-DIFF = 100Ω f = 17MHz, VO = 4VP-P_DIFF, RL-DIFF = 100Ω SR Slew Rate, Single-ended VOUT from -3V to +3V 750 -79 dBc 1200 V/µs DC PERFORMANCE VOS_CM Offset Voltage Common Mode -40 +40 mV VOS_DM Offset Voltage Differential Mode -7.5 +7.5 mV ROL Differential Transimpedance VOUT = 12VP-P differential, unloaded 3.0 MΩ INPUT CHARACTERISTICS IB+ Non-Inverting Input Bias Current -7.0 IB- DM Inverting Input Bias Current Differential Mode -75 eN Input Noise Voltage 6 nV√ Hz iN -Input Noise Current 13 pA/√ Hz 3 +7.0 µA +75 µA OUTPUT CHARACTERISTICS VOUT IOUT Loaded Output Swing (single ended) VS = ±6V, RL DIFF = 50Ω ±4.8 ±5.0 V VS = ±6V, RL DIFF = 20Ω ±4.35 ±4.7 V 1000 mA Output Current RL = 0Ω VS Supply Voltage Single supply SUPPLY 4.5 13.2 V 21.5 mA IS+ (Full Bias) Positive Supply Current per Amplifier All outputs at 0V, BIAS0 = BIAS1 = 0V IS+ (Medium Bias) Positive Supply Current per Amplifier All outputs at 0V, BIAS0 = 5V, BIAS1 = 0V 11 mA IS+ (Low Bias) Positive Supply Current per Amplifier All outputs at 0V, BIAS0 = 0V, BIAS1 = 5V 6.0 mA IS+ (Power-down) Positive Supply Current per Amplifier All outputs at 0V, BIAS0 = BIAS1 = 5V 12 IINH, BIAS0 or BIAS1 BIAS0, BIAS1 Input Current, High BIAS0, BIAS1 = 6V 100 IINL, BIAS0 or BIAS1 BIAS0, BIAS1 = 0V -5 BIAS0, BIAS1 Input Current, Low VINH, BIAS0 or BIAS1 BIAS0, BIAS1 Input Voltage, High VINL, BIAS0 or BIAS1 BIAS0, BIAS1 Input Voltage, Low 3 15 0.6 1.0 mA 175 250 µA +5 µA 2.0 V 0.8 V FN6387.1 September 3, 2009 ISL1571 Typical Performance Curves VS = ±6V AV = 5 RL = 100Ω DIFF RF = 500Ω VS = ±6V AV = 5 RL = 100Ω DIFF RF = 750Ω RF = 750Ω RF = 1kΩ RF = 1kΩ FIGURE 1. DIFFERENTIAL FREQUENCY RESPONSE WITH VARIOUS RF (FULL BIAS MODE) VS = ±6V AV = 5 RL = 100Ω DIFF RF = 500Ω RF = 500Ω FIGURE 2. DIFFERENTIAL FREQUENCY RESPONSE WITH VARIOUS RF (MEDIUM BIAS MODE) VS = ±6V AV = 10 RL = 100Ω DIFF RF = 500Ω RF = 750Ω RF = 750Ω RF = 1kΩ RF = 1kΩ FIGURE 3. DIFFERENTIAL FREQUENCY RESPONSE WITH VARIOUS RF (LOW BIAS MODE) VS = ±6V AV = 10 RL = 100Ω DIFF RF = 500Ω RF = 750Ω RF = 1kΩ FIGURE 5. DIFFERENTIAL FREQUENCY RESPONSE WITH VARIOUS RF (MEDIUM BIAS MODE) 4 FIGURE 4. DIFFERENTIAL FREQUENCY RESPONSE WITH VARIOUS RF (FULL BIAS MODE) VS = ±6V AV = 10 RL = 100Ω DIFF RF = 500Ω RF = 750Ω RF = 1kΩ FIGURE 6. DIFFERENTIAL FREQUENCY RESPONSE WITH VARIOUS RF (LOW BIAS MODE) FN6387.1 September 3, 2009 ISL1571 HARMONIC DISTORTION (dBc) c) VS = ±6V AV = 5 RF = 750Ω RL = 100Ω DIFF (Continued) 2ND HD 3RD HD HARMONIC DISTORTION (dBc)c) Typical Performance Curves 2ND HD VS = ±6V AV = 5 RF = 750Ω VO(P-P) = 4V 3RD HD DIFFERENTIAL VOLTAGE OUTPUTP-P VS = ±6V AV = 5 RF = 750Ω RL = 100Ω DIFF FIGURE 8. 2ND AND 3RD HARMONIC DISTORTION vs RLOAD @ 2MHz HARMONIC DISTORTION (dBc) c) HARMONIC DISTORTION (dBc) c) FIGURE 7. HARMONIC DISTORTION @ 2MHz 2ND HD 3RD HD 2ND HD VS = ±6V AV = 5 RF = 750Ω VO(P-P) = 4V 3RD HD DIFFERENTIAL VOLTAGE OUTPUTP-P 2ND HD VS = ±6V AV = 5 RF = 750Ω RL = 100Ω DIFF 3RD HD FIGURE 10. 2ND AND 3RD HARMONIC DISTORTION vs RLOAD @ 3MHz HARMONIC DISTORTION (dBc) c) HARMONIC DISTORTION (dBc) c) FIGURE 9. HARMONIC DISTORTION @ 3MHz VS = ±6V AV = 5 RF = 750Ω VOPP = 4V 2ND HD 3RD HD DIFFERENTIAL VOLTAGE OUTPUTP-P FIGURE 11. HARMONIC DISTORTION @ 5MHz 5 FIGURE 12. 2ND AND 3RD HARMONIC DISTORTION vs RLOAD @ 5MHz FN6387.1 September 3, 2009 ISL1571 VS = ±6V AV = 5 RF = 750Ω RL = 100Ω DIFF (Continued) 2ND HD 3RD HD HARMONIC DISTORTION (dBc) c) HARMONIC DISTORTION (dBc) c) Typical Performance Curves VS = ±6V AV = 5 RF = 750Ω VOPP = 4V 2ND HD 3RD HD DIFFERENTIAL VOLTAGE OUTPUTP-P HARMONIC DISTORTION (dBc)c) FIGURE 13. HARMONIC DISTORTION @ 10MHz VS = ±6V AV = 5 RF = 750Ω RL = 100Ω DIFF FIGURE 14. 2ND AND 3RD HARMONIC DISTORTION vs RLOAD @ 10MHz IS+ IS2ND HD FULL BIAS MEDIUM BIAS 3RD HD LOW BIAS ±VS (V) DIFFERENTIAL VOLTAGE OUTPUTP-P FIGURE 15. HARMONIC DISTORTION @ 17MHz VS = ±6V AV = 5 RF = 750Ω RL= 100Ω CL = 22pF CL = 12pF CL = 0pF FIGURE 17. FREQUENCY RESPONSE WITH VARIOUS CL (FULL BIAS MODE) 6 FIGURE 16. SUPPLY CURRENT vs SUPPLY VOLTAGE VS = ±6V AV = 5 RF = 750Ω RL= 100Ω CL = 22pF CL = 12pF CL = 0pF FIGURE 18. FREQUENCY RESPONSE vs VARIOUS CL (MEDIUM BIAS MODE) FN6387.1 September 3, 2009 ISL1571 Typical Performance Curves VS = ±6V AV = 5 RF = 750Ω RL = 100Ω (Continued) VS = ±6V CL = 22pF PSRR+ CL = 12pF CL = 0pF PSRR- FIGURE 20. PSRR vs FREQUENCY FIGURE 19. FREQUENCY RESPONSE WITH VARIOUS CL (LOW BIAS MODE) JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD - EXPOSED DIEPAD SOLDERED TO PCB PER JESD51-5 4.5 VS = ±6V AV = 1 RF = 750Ω 4.0 POWER DISSIPATION (W) OUTPUT IMPEDANCE (Ω) 100 10 1 0.1 3.5 3.0 2.40W 2.5 2.0 2.02W 1.5 1.0 HMSOP10 θJA = +62°C/W 0.5 0.01 10k QFN16 θJA = +52°C/W 0 100k 1M 10M 100M FREQUENCY (Hz) FIGURE 21. OUTPUT IMPEDANCE vs FREQUENCY Product Description The ISL1571 is a dual operational amplifier designed for line driving in OFDM and PLC solutions. It is a dual current mode feedback amplifier with low distortion while drawing moderately low supply current. It is built using Intersil’s proprietary complimentary bipolar process and is offered in industry standard pinouts. Due to the current feedback architecture, the ISL1571 closed-loop 3dB bandwidth is dependent on the value of the feedback resistor. First the desired bandwidth is selected by choosing the feedback resistor, RF, and then the gain is set by picking the gain resistor, RG. The curves at the beginning of the “Typical Performance Curves” on page 4, show the effect of varying both RF and RG. The 3dB bandwidth is somewhat dependent on the power supply voltage. 7 0 25 50 75 85 100 125 150 AMBIENT TEMPERATURE (°C) FIGURE 22. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE Power Supply Bypassing and Printed Circuit Board Layout As with any high frequency device, good printed circuit board layout is necessary for optimum performance. Ground plane construction is highly recommended. Lead lengths should be as short as possible, below 0.25”. The power supply pins must be well bypassed to reduce the risk of oscillation. A 4.7µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor is adequate for each supply pin. During power-up, it is necessary to limit the slew rate of the rising power supply to within 1V/µs. If the power supply rising time is undetermined, a series 10Ω resistor on the power supply line can be used to ensure the proper power supply rise time. For good AC performance, parasitic capacitances should be kept to a minimum, especially at the inverting input. This implies keeping the ground plane away from this pin. Carbon resistors are acceptable, while use of wire-wound resistors FN6387.1 September 3, 2009 ISL1571 should be avoided because of their parasitic inductance. Similarly, capacitors should be low inductance for best performance. Capacitance at the Inverting Input Due to the topology of the current feedback amplifier, stray capacitance at the inverting input will affect the AC and transient performance of the ISL1571 when operating in the non-inverting configuration. In the inverting gain mode, added capacitance at the inverting input has little effect since this point is at a virtual ground and stray capacitance is therefore not “seen” by the amplifier. Feedback Resistor Values The ISL1571 has been designed and specified with RF = 750Ω for AV = +5. This value of feedback resistor yields extremely flat frequency response with 1dB peaking out to 250MHz. As is the case with all current feedback amplifiers, wider bandwidth, at the expense of slight peaking, can be obtained by reducing the value of the feedback resistor. Inversely, larger values of feedback resistor will cause rolloff to occur at a lower frequency. See the curves in the “Typical Performance Curves” section, beginning on page 4, which show 3dB bandwidth and peaking vs frequency for various feedback resistors and various supply voltages. Bandwidth vs Temperature Whereas many amplifier's supply current and consequently 3dB bandwidth drop off at high temperature, the ISL1571 was designed to have little supply current variations with temperature. An immediate benefit is the 3dB bandwidth does not drop off drastically with temperature. Supply Voltage Range The ISL1571IRZ has been designed to operate with supply voltages from ±2.25V to ±6V nominal. Optimum bandwidth, slew rate, and video characteristics are obtained at higher supply voltages. Single Supply Operation If a single supply is desired, values from +4.5V to +12V nominal can be used as long as the input common mode range is not exceeded. When using a single supply, be sure to either: 1. DC bias the inputs at an appropriate common mode voltage and AC couple the signal, or: 2. Ensure the driving signal is within the common mode range of the ISL1571. ISL1571IUEZ must be used in single supply applications. PLC Modem Applications The ISL1571 is designed as a line driver for PLC modems. It is capable of outputting 450mA of output current with a typical supply voltage headroom of 1.3V. It can achieve -85dBc of distortion at low 7.1mA of supply current per amplifier. The average line power requirement for the PLC application is 13dBm (20mW) into a 100Ω line. The average line voltage is 1.41VRMS. Using a differential drive configuration and transformer coupling with standard back termination, a transformer ratio of 1:2 is selected. The circuit configuration is shown in Figure 23. + - 12.5 TX1 750 AFE 100 250Ω + - 1:2 12.5 750 FIGURE 23. CIRCUIT CONFIGURATION 8 FN6387.1 September 3, 2009 ISL1571 QFN (Quad Flat No-Lead) Package Family MDP0046 QFN (QUAD FLAT NO-LEAD) PACKAGE FAMILY (COMPLIANT TO JEDEC MO-220) A MILLIMETERS D N (N-1) (N-2) B 1 2 3 PIN #1 I.D. MARK E (N/2) 2X 0.075 C 2X 0.075 C N LEADS TOP VIEW 0.10 M C A B (N-2) (N-1) N b L SYMBOL QFN44 QFN38 TOLERANCE NOTES A 0.90 0.90 0.90 0.90 ±0.10 - A1 0.02 0.02 0.02 0.02 +0.03/-0.02 - b 0.25 0.25 0.23 0.22 ±0.02 - c 0.20 0.20 0.20 0.20 Reference - D 7.00 5.00 8.00 5.00 Basic - Reference 8 Basic - Reference 8 Basic - D2 5.10 3.80 5.80 3.60/2.48 E 7.00 7.00 8.00 1 2 3 6.00 E2 5.10 5.80 5.80 4.60/3.40 e 0.50 0.50 0.80 0.50 L 0.55 0.40 0.53 0.50 ±0.05 - N 44 38 32 32 Reference 4 ND 11 7 8 7 Reference 6 NE 11 12 8 9 Reference 5 MILLIMETERS PIN #1 I.D. 3 QFN32 SYMBOL QFN28 QFN24 QFN20 QFN16 A 0.90 0.90 0.90 0.90 0.90 ±0.10 - A1 0.02 0.02 0.02 0.02 0.02 +0.03/ -0.02 - b 0.25 0.25 0.30 0.25 0.33 ±0.02 - c 0.20 0.20 0.20 0.20 0.20 Reference - D 4.00 4.00 5.00 4.00 4.00 Basic - D2 2.65 2.80 3.70 2.70 2.40 Reference - (E2) (N/2) NE 5 7 (D2) BOTTOM VIEW 0.10 C e C SEATING PLANE TOLERANCE NOTES E 5.00 5.00 5.00 4.00 4.00 Basic - E2 3.65 3.80 3.70 2.70 2.40 Reference - e 0.50 0.50 0.65 0.50 0.65 Basic - L 0.40 0.40 0.40 0.40 0.60 ±0.05 - N 28 24 20 20 16 Reference 4 ND 6 5 5 5 4 Reference 6 NE 8 7 5 5 4 Reference 5 Rev 11 2/07 0.08 C N LEADS & EXPOSED PAD SEE DETAIL "X" NOTES: 1. Dimensioning and tolerancing per ASME Y14.5M-1994. 2. Tiebar view shown is a non-functional feature. SIDE VIEW 3. Bottom-side pin #1 I.D. is a diepad chamfer as shown. 4. N is the total number of terminals on the device. (c) C 5. NE is the number of terminals on the “E” side of the package (or Y-direction). 2 A (L) A1 N LEADS DETAIL X 6. ND is the number of terminals on the “D” side of the package (or X-direction). ND = (N/2)-NE. 7. Inward end of terminal may be square or circular in shape with radius (b/2) as shown. 8. If two values are listed, multiple exposed pad options are available. Refer to device-specific datasheet. 9 FN6387.1 September 3, 2009 ISL1571 HMSOP (Heat-Sink MSOP) Package Family E B 0.25 M C A B E1 MDP0050 HMSOP (HEAT-SINK MSOP) PACKAGE FAMILY MILLIMETERS 1 N SYMBOL D (N/2)+1 (N/2) PIN #1 I.D. A HMSOP8 HMSOP10 TOLERANCE NOTES A 1.00 1.00 Max. - A1 0.075 0.075 +0.025/-0.050 - A2 0.86 0.86 ±0.09 - b 0.30 0.20 +0.07/-0.08 - c 0.15 0.15 ±0.05 - D 3.00 3.00 ±0.10 1, 3 D1 1.85 1.85 Reference - E 4.90 4.90 ±0.15 - E1 3.00 3.00 ±0.10 2, 3 E2 1.73 1.73 Reference - e 0.65 0.50 Basic - L 0.55 0.55 ±0.15 - L1 0.95 0.95 Basic - N 8 10 Reference - TOP VIEW E2 EXPOSED THERMAL PAD D1 BOTTOM VIEW Rev. 1 2/07 e NOTES: H 1. Plastic or metal protrusions of 0.15mm maximum per side are not included. C SEATING PLANE 2. Plastic interlead protrusions of 0.25mm maximum per side are not included. 0.08 M C A B b 0.10 C N LEADS 3. Dimensions “D” and “E1” are measured at Datum Plane “H”. 4. Dimensioning and tolerancing per ASME Y14.5M-1994. SIDE VIEW L1 A c END VIEW SEE DETAIL "X" A2 GAUGE 0.25 PLANE L 3¬¨¬®Ð A1 DETAIL X All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements 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 Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 10 FN6387.1 September 3, 2009