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SOC/DAC/Encoder

S-Video

Y’

S-Video

C’

Y'/G'

SD1OUT

SD2OUT

SD3OUT

DisableSD

GND

DisableSF

SF1OUT

SF2OUT

SF3OUT

BypassSF

SD1IN

SD2IN

SD3IN

Filter2

S+

Filter1

SF1IN

SF2IN

SF3IN

BypassSD

THS7360

Bypass

SDLPF

Bypass

SFLPF

P' /B'

CVBS

P' /R'

CVBSOut

Y'Out

75 W

C'Out

75 W

Y'/G'Out

P' /B'Out

P' /R'Out

+2.7Vto

+5V

DisableSF

DisableSD

Filter2

Filter1

75 W

S-Video

THS7360

www.ti.com

SLOS674 –JUNE 2010

6-Channel Video Amplifier with 3-SD and 3-SD/ED/HD/Full-HD Filters and High Gain

Check for Samples: THS7360

FEATURES

DESCRIPTION

2345

• Three SDTV Video Amplifiers for CVBS,

Fabricated using the revolutionary, complementary

S-Video, Y’/P’

/P’

, 480i/576i, Y’U’V’, or G'B'R'

Silicon-Germanium (SiGe) BiCom3X process, the

THS7360 is a low-power, single-supply, 2.7-V to 5-V,

• Three SD/ED/HD/Full-HD Selectable Filters for

six-channel integrated video buffer. It incorporates

Y’/P’

/P’

, G’B’R’, or Computer RGB

three SDTV filter channels and three selectable filter

• Bypassable Sixth-Order Low-Pass Filters:

(SF) channels with SD/ED/HD/Full-HD (also known

– Fixed SD Channels: 9.5-MHz

as True-HD) HDTV filtering. All filters feature

sixth-order Butterworth characteristics that are useful

– Selectable Filter (SF) Channels:

as digital-to-analog converter (DAC) reconstruction

9.2-MHz/17-MHz/35-MHz/70-MHz

filters or as analog-to-digital converter (ADC)

• Versatile Input Biasing:

anti-aliasing filters.

– DC-Coupled with 120-mV Output Shift

The THS7360 also has flexible input coupling

– AC-Coupled with Sync-Tip Clamp or Bias

capabilities that can be configured for either ac- or

• Gain of 5.6 V/V (SD Channels) and

dc-coupled inputs. The 120-mV output level shift

allows for a full sync dynamic range at the output with

4.5 V/V (SF Channels)

0-V input. The ac-coupled modes include a

• +2.7-V to +5-V Single-Supply Operation

transparent sync-tip clamp option for CVBS, Y', and

• Rail-to-Rail Output:

G'B'R' signals. AC-coupled biasing for C'/P'

/P'

– Output Swings Within 100 mV from the

channels can easily be achieved by adding an

external resistor to V

S+

Rails: Allows AC or DC Output Coupling

– Supports Driving Two Video Lines/Channel

The THS7360 is an ideal choice for all video buffer

applications. Its rail-to-rail output stage with 5.6-V/V

• Low Total Quiescent Current: 24.5 mA at 3.3 V

gain (for SD channels) and 4.5-V/V gain (for SF

• Disabled Supply Current Function: 0.1 mA

channels) allows for both ac and dc line driving. The

• Low Differential Gain/Phase: 0.15%/0.35°

ability to drive two lines, or 75-Ω loads, allows for

maximum flexibility as a video line driver. The

• RoHS-Compliant TSSOP-20 Package

24.5-mA total quiescent current at 3.3 V and 0.1 mA

(disabled mode) makes it a good choice for systems

APPLICATIONS

that must meet power-sensitive Energy Star

• Set Top Box Output Video Buffering

standards.

• PVR/DVDR Output Buffering

The THS7360 is available in a TSSOP-20 package

• BluRay™ Output Video Buffering

that is lead-free and green (RoHS-compliant).

Figure 1. Single-Supply, DC-Input/DC-Output Coupled Video Line Driver

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2BluRay is a trademark of Blu-ray Disc Association (BDA).

3Energy Star is a registered trademark of Energy Star.

4Macrovision is a registered trademark of Macrovision Corporation.

5All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (45 pages)

PAGE 1
THS7360 www.ti.com SLOS674 – JUNE 2010 6-Channel Video Amplifier with 3-SD and 3-SD/ED/HD/Full-HD Filters and High Gain Check for Samples: THS7360 FEATURES DESCRIPTION • Three SDTV Video Amplifiers for CVBS, S-Video, Y’/P’B/P’R, 480i/576i, Y’U’V’, or G'B'R' • Three SD/ED/HD/Full-HD Selectable Filters for Y’/P’B/P’R, G’B’R’, or Computer RGB • Bypassable Sixth-Order Low-Pass Filters: – Fixed SD Channels: 9.5-MHz – Selectable Filter (SF) Channels: 9.
PAGE 2
THS7360 SLOS674 – JUNE 2010 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
PAGE 3
THS7360 www.ti.com SLOS674 – JUNE 2010 RECOMMENDED OPERATING CONDITIONS MIN NOM MAX UNIT Supply voltage, VS+ 2.7 5 V Ambient temperature, TA –40 +85 °C ELECTRICAL CHARACTERISTICS: VS+ = +3.3 V At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7360 PARAMETER MAX UNITS TEST LEVEL (1) 8.2 10 MHz B 9.5 11.3 MHz B TEST CONDITIONS MIN TYP Passband bandwidth –1 dB; VO = 0.2 VPP and 2 VPP 6.
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THS7360 SLOS674 – JUNE 2010 www.ti.com ELECTRICAL CHARACTERISTICS: VS+ = +3.3 V (continued) At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7360 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) 6.6 8 9.6 MHz B AC PERFORMANCE (SF (3) CHANNELS, SD FILTER) Passband bandwidth –1 dB; VO = 0.2 VPP and 2 VPP Small- and large-signal bandwidth Attenuation –3 dB; VO = 0.2 VPP and 2 VPP 7.8 9.
PAGE 5
THS7360 www.ti.com SLOS674 – JUNE 2010 ELECTRICAL CHARACTERISTICS: VS+ = +3.3 V (continued) At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7360 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) 26 30 36 MHz B AC PERFORMANCE (SF CHANNELS, HD FILTER) Passband bandwidth –1 dB; VO = 0.2 VPP and 2 VPP Small- and large-signal bandwidth Attenuation –3 dB; VO = 0.
PAGE 6
THS7360 SLOS674 – JUNE 2010 www.ti.com ELECTRICAL CHARACTERISTICS: VS+ = +3.3 V (continued) At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7360 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) AC PERFORMANCE (SF CHANNELS, BYPASS) Passband bandwidth –1 dB; VO = 0.2 VPP 140 180 MHz B Small-signal bandwidth B –3 dB; VO = 0.2 VPP 200 280 MHz Slew rate VO = 2 VPP 650 800 V/µs B Group delay f = 100 kHz 3 ns C 0.
PAGE 7
THS7360 www.ti.com SLOS674 – JUNE 2010 ELECTRICAL CHARACTERISTICS: VS+ = +3.3 V (continued) At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7360 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) 2.6 3.3 5.5 V B POWER SUPPLY Operating voltage Total quiescent current, no load VIN = 0 V, all channels on 18.8 24.5 29.5 mA A VIN = 0 V, SD channels on, SF channels off 5.6 7.
PAGE 8
THS7360 SLOS674 – JUNE 2010 www.ti.com ELECTRICAL CHARACTERISTICS: VS+ = +5 V At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7360 TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) Passband bandwidth –1 dB; VO = 0.2 VPP and 2 VPP 6.7 8.2 10 MHz B Small- and large-signal bandwidth –3 dB; VO = 0.2 VPP and 2 VPP 8 9.5 11.3 MHz B –3 dB; VO = 0.
PAGE 9
THS7360 www.ti.com SLOS674 – JUNE 2010 ELECTRICAL CHARACTERISTICS: VS+ = +5 V (continued) At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7360 PARAMETER MIN TYP MAX UNITS TEST LEVEL (1) –1 dB; VO = 0.2 VPP and 2 VPP 11 15 18.5 MHz B TEST CONDITIONS AC PERFORMANCE (SF CHANNELS, ED FILTER) Passband bandwidth Small- and large-signal bandwidth Attenuation –3 dB; VO = 0.
PAGE 10
THS7360 SLOS674 – JUNE 2010 www.ti.com ELECTRICAL CHARACTERISTICS: VS+ = +5 V (continued) At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7360 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) 53 61 72 MHz B AC PERFORMANCE (SF CHANNELS, FULL/TRUE-HD FILTER) Passband bandwidth –1 dB; VO = 0.2 VPP and 2 VPP Small- and large-signal bandwidth Attenuation –3 dB; VO = 0.
PAGE 11
THS7360 www.ti.com SLOS674 – JUNE 2010 ELECTRICAL CHARACTERISTICS: VS+ = +5 V (continued) At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7360 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) VIN = 0 V, SD channels 35 160 315 mV A VIN = 0 V, SF channels 35 120 300 DC PERFORMANCE Biased output voltage Input voltage range DC input, limited by output range Sync-tip clamp charge current VIN = –0.
PAGE 12
THS7360 SLOS674 – JUNE 2010 www.ti.com PIN CONFIGURATION PW PACKAGE TSSOP-20 (TOP VIEW) SD1 IN 1 20 SD1 OUT SD2 IN 2 19 SD2 OUT SD3 IN 3 18 SD3 OUT Filter 2 4 17 Disable SD VS+ 5 16 GND Filter 1 6 15 Disable SF SF1 IN 7 14 SF1 OUT SF2 IN 8 13 SF2 OUT SF3 IN 9 12 SF3 OUT Bypass SD 10 11 Bypass SF TERMINAL FUNCTIONS TERMINAL NAME NO. I/O SD1 IN 1 I Standard-definition video input, channel 1; LPF = 9.
PAGE 13
THS7360 www.ti.com SLOS674 – JUNE 2010 FUNCTIONAL BLOCK DIAGRAM +VS gm Level Shift SD Channel 1 Input (CVBS) LPF Sync-Tip Clamp (DC Restore) 800 kW Bypass SD 5.6 V/V SD Channel 1 Output (CVBS) 5.6 V/V SD Channel 2 Output (S-Video Y) 5.6 V/V SD Channel 3 Output (S-Video C) 6-Pole 9.5 MHz +VS gm Level Shift SD Channel 2 Input (S-Video Y) LPF Sync-Tip Clamp (DC Restore) 800 kW Bypass SD 6-Pole 9.
PAGE 14
THS7360 SLOS674 – JUNE 2010 www.ti.com TYPICAL CHARACTERISTICS Table 3. Table of Graphs: 3.3 V, Standard-Definition (SD) Channels TITLE FIGURE SD Channels Small-Signal Gain vs Frequency Response Figure 2, Figure 3, Figure 8, Figure 9 SD Channels Phase vs Frequency Response Figure 4 SD Channels Group Delay vs Frequency Response Figure 5 SD Channels Large-Signal Gain vs Frequency Response Figure 6, Figure 7 SD Channels 1.4 VPP THD vs Frequency Figure 10 SD Channels 0.
PAGE 15
THS7360 www.ti.com SLOS674 – JUNE 2010 TYPICAL CHARACTERISTICS: 3.3 V, Standard-Definition (SD) Channels With load = 150 Ω || 5 pF, dc-coupled input and output, unless otherwise noted. SD CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE SD CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE 20 15.5 15.0 0 -10 VS+ = 3.
PAGE 16
THS7360 SLOS674 – JUNE 2010 www.ti.com TYPICAL CHARACTERISTICS: 3.3 V, Standard-Definition (SD) Channels (continued) With load = 150 Ω || 5 pF, dc-coupled input and output, unless otherwise noted. SD CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE 20 SD CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE 15.5 Bypass Mode Bypass Mode 15.0 Filter Mode 0 AC -10 DC -20 VS+ = 3.3 V Load = 150 W || 10 pF AC- vs DC-Coupled Output VO = 0.
PAGE 17
THS7360 www.ti.com SLOS674 – JUNE 2010 TYPICAL CHARACTERISTICS: 3.3 V, Selectable Filter (SF) Channels With load = 150 Ω || 5 pF, dc-coupled input and output, unless otherwise noted. SF CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE SF CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE 20 13.5 Bypass 13.0 SD Filter Small-Signal Gain (dB) Small-Signal Gain (dB) 10 0 ED Filter Full-HD Filter -10 HD Filter -20 VS+ = 3.3 V Load = 150 W || 5 pF DC-Coupled Output VO = 200 mVPP -30 -40 12.
PAGE 18
THS7360 SLOS674 – JUNE 2010 www.ti.com TYPICAL CHARACTERISTICS: 3.3 V, Selectable Filter (SF) Channels (continued) With load = 150 Ω || 5 pF, dc-coupled input and output, unless otherwise noted. SF CHANNELS AC-COUPLED SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE SF CHANNELS LARGE-SIGNAL GAIN vs FREQUENCY RESPONSE 14.5 20 Small-Signal Gain (dB) 13.5 Full-HD Filter Bypass 10 Large-Signal Gain (dB) SD Filter ED Filter HD Filter 14.0 13.0 12.5 12.0 11.5 11.0 10.5 10.0 VS+ = 3.
PAGE 19
THS7360 www.ti.com SLOS674 – JUNE 2010 TYPICAL CHARACTERISTICS: 5 V, Standard-Definition (SD) Channels With load = 150 Ω || 5 pF, dc-coupled input and output, unless otherwise noted. SD CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE SD CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE 20 15.5 15.
PAGE 20
THS7360 SLOS674 – JUNE 2010 www.ti.com TYPICAL CHARACTERISTICS: 5 V, Standard-Definition (SD) Channels (continued) With load = 150 Ω || 5 pF, dc-coupled input and output, unless otherwise noted. SD CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE 20 SD CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE 15.5 Bypass Mode Bypass Mode 15.0 Filter Mode 0 AC -10 DC -20 VS+ = 5 V Load = 150 W || 10 pF AC- vs DC-Coupled Output VO = 0.
PAGE 21
THS7360 www.ti.com SLOS674 – JUNE 2010 TYPICAL CHARACTERISTICS: 5 V, Selectable Filter (SF) Channels With load = 150 Ω || 5 pF, dc-coupled input and output, unless otherwise noted. SF CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE SF CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE 20 13.5 DC-Coupled Output Bypass 13.
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THS7360 SLOS674 – JUNE 2010 www.ti.com APPLICATION INFORMATION The THS7360 is targeted for six-channel video output applications that require three standard-definition (SD) video output buffers and three selectable filter (SF) output buffers. Although it can be used for numerous other applications, the needs and requirements of the video signal are the most important design parameters of the THS7360.
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THS7360 www.ti.com SLOS674 – JUNE 2010 INPUT OVERVOLTAGE PROTECTION These diodes provide moderate protection to input overdrive voltages above and below the supplies as well. The protection diodes can typically support 30 mA of continuous current when overdriven. The THS7360 is built using a very high-speed, complementary, bipolar CMOS process. The internal junction breakdown voltages are relatively low for these very small geometry devices.
PAGE 24
THS7360 SLOS674 – JUNE 2010 www.ti.com Note that the Y’ term is used for the luma channels throughout this document rather than the more common luminance (Y) term. This usage accounts for the definition of luminance as stipulated by the International Commission on Illumination (CIE). Video departs from true luminance because a nonlinear term, gamma, is added to the true RGB signals to form R’G’B’ signals. These R’G’B’ signals are then used to mathematically create luma (Y’).
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THS7360 www.ti.com SLOS674 – JUNE 2010 Because the internal gain is fixed, the gain dictates what the allowable linear input voltage range can be without clipping concerns. For example, if the power supply is set to 3 V, the maximum output is approximately 2.9 V while driving a significant amount of current. Thus, to avoid clipping on the SD channels, the allowable input is (2.9 V - 0.12V)/5.6 = 0.5 V. This range is valid for up to the maximum recommended 5-V power supply that allows approximately a (4.
PAGE 26
THS7360 SLOS674 – JUNE 2010 www.ti.com It should be noted that this STC system is dynamic and does not rely upon timing in any way. It only depends on the voltage that appears at the input pin at any given point in time. The STC filtering helps minimize level shift problems associated with switching noises or very short spikes on the signal line. This architecture helps ensure a very robust STC system. When the ac STC operation is used, there must also be some finite amount of discharge bias current.
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THS7360 www.ti.com SLOS674 – JUNE 2010 The THS7360 allowable input range is approximately 0 V to (VS+ – 1.5 V), allowing for a very wide input voltage range. As such, the input dc bias point is very flexible, with the output dc bias point being the primary factor. For example, if the output dc bias point on a SD channel is desired to be 1.6 V on a 3.3-V supply, then the input dc bias point should be (1.6 V – 120 mV)/5.6 = 0.264 V. Thus, the pull-up resistor calculates to approximately 9.
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THS7360 SLOS674 – JUNE 2010 www.ti.com CVBS 1 Out 75 W CVBS 1 Out 75 W THS7360 CVBS R S-Video Y’ SOC/DAC/Encoder R +2.
PAGE 29
THS7360 www.ti.com SLOS674 – JUNE 2010 filter channels. One way to help ensure this condition is satisfied is to make sure the 75-Ω source resistor is placed within 0.5-inches to each THS7360 output pin. If a large ac-coupling capacitor is used, the capacitor should be placed after this resistor. There are many reasons dc-coupling is desirable, including reduced costs, PCB area, and no line tilt. A common question is whether or not there are any drawbacks to using dc-coupling.
PAGE 30
THS7360 SLOS674 – JUNE 2010 www.ti.com THS7360 (1) 0.1 mF R (1) 0.1 mF +2.7 V to +5 V R (1) 0.1 mF R (1) 0.
PAGE 31
THS7360 www.ti.com SLOS674 – JUNE 2010 9.5-MHz, –3-dB corner frequency was designed to achieve 54 dB of attenuation at 27 MHz—a common sampling frequency between the DAC/ADC second and third Nyquist zones found in many video systems. This consideration is important because any signal that appears around this frequency can also appear in the baseband as a result of aliasing effects of an ADC found in a receiver. The THS7360 SF filters have a nominal corner (–3 dB) frequency at 9.
PAGE 32
THS7360 SLOS674 – JUNE 2010 www.ti.com the source impedance (which includes the source, series resistor, and the filter) must be better than 75 Ω, +9/–8 Ω. The THS7360 is an operational amplifier that approximates an ideal voltage source, which is desirable because the output impedance is very low and can source and sink current. To properly match the transmission line characteristic impedance of a video line, a 75-Ω series resistor is placed on the output.
PAGE 33
THS7360 www.ti.com SLOS674 – JUNE 2010 EVALUATION MODULE To evaluate the THS7360, an evaluation module (EVM) is available. The THS7360EVM allows for testing the THS7360 in many different configurations. Inputs and outputs include BNC connectors and RCA connectors commonly found in video systems, along with 75-Ω input termination resistors, 75-Ω series source termination resistors, and 75-Ω characteristic impedance traces.
PAGE 34
THS7360 www.ti.com + + SLOS674 – JUNE 2010 Figure 49.
PAGE 35
THS7360 www.ti.com SLOS674 – JUNE 2010 + + + + + + Figure 50.
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THS7360 SLOS674 – JUNE 2010 www.ti.com Figure 51.
PAGE 37
THS7360 www.ti.com SLOS674 – JUNE 2010 Figure 52.
PAGE 38
THS7360 SLOS674 – JUNE 2010 www.ti.com THS7360EVM Bill of Materials Table 7. THS7360 EVM 38 ITEM REF DES QTY DESCRIPTION SMD SIZE 1 FB1, FB2 2 Bead, ferrite, 2.5 A, 330 Ω 2 C12 1 Capacitor, 100 µF, tantalum, 10 V, 10%, low ESR 3 C40 1 Capacitor, 22 µF, tantalum, 16 V, 10%, low ESR 4 C1-C6, C13-C18, C31-C36 18 Open 0805 5 C37 1 Capacitor, 0.
PAGE 39
THS7360 www.ti.com SLOS674 – JUNE 2010 EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 24-Jan-2014 TAPE AND REEL INFORMATION *All dimensions are nominal Device THS7360IPWR Package Package Pins Type Drawing TSSOP PW 20 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2000 330.0 16.4 Pack Materials-Page 1 6.95 B0 (mm) K0 (mm) P1 (mm) 7.1 1.6 8.0 W Pin1 (mm) Quadrant 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 24-Jan-2014 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) THS7360IPWR TSSOP PW 20 2000 367.0 367.0 38.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.