1.5 Gbps Differential Buffer

www.DataSheet4U.com DS15BA101 1.5 Gbps Differential Buffer with Adjustable Output Voltage December 2006 DS15BA101 1.5 Gbps Differential Buffer with Adjustable Output Voltage General Description The DS15BA101 is a high-speed differential buffer for cable driving, level translation, signal buffering, and signal repeating applications. Its fully differential signal path ensures exceptional signal integrity and noise immunity and it drives both differential and single-ended transmission lines at data rates up to 1.5 Gbps. Output voltage amplitude is adjustable via a single external resistor for level translation and cable driving applications into 50-ohm single-ended and 100-ohm differential mode impedances. The DS15BA101 is powered from a single 3.3V supply and consumes 150 mW (typ) at 1.5 Gbps. The DS15BA101 operates over the full −40°C to +85°C industrial temperature range and is available in a space saving 3x3 mm LLP-8 package. Features ■ ■ ■ ■ ■ ■ ■ Data rates from DC to 1.5 Gbps Differential or single-ended input Adjustable output amplitude Single 3.3V supply Industrial -40°C to +85°C temperature Low power: 150 mW (typ) at 1.5 Gbps Space-saving 3 x 3 mm LLP-8 package Applications ■ ■ ■ ■ ■ ■ ■ Cable extension applications Level translation Signal buffering and repeating Digital routers and switches Sonet/SDH and ATM interfaces Set top boxes Security cameras Typical Application 20199902 © 2006 National Semiconductor Corporation 201999 www.national.com DS15BA101 Absolute Maximum Ratings (Note 1) Supply Voltage: Input Voltage (all inputs) Output Current Storage Temperature Range Junction Temperature Lead Temperature (Soldering 4 Sec) Package Thermal Resistance  θJA LLP-8  θJC LLP-8 −0.5V to 3.6V −0.3V to VCC+0.3V 28 mA −65°C to +150°C +150°C +260°C +90.7°C/W +41.2°C/W ESD Rating (HBM) ESD Rating (MM) 5 kV 250V Recommended Operating Conditions Supply Voltage (VCC – GND): Operating Free Air Temperature (TA) DS15BA101SD 3.3V ±5% −40°C to +85°C DC Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Notes 2, 3). Symbol Parameter VICM VID VOS VOUT Input Common Mode Voltage Differential Input Voltage Swing Output Common Mode Voltage Output Voltage Single-ended, 50Ω load,RVO = 953Ω 1%, Single-ended, 50Ω load,RVO = 487Ω 1%, ICC Supply Current (Note 5) OUT+, OUTConditions Reference IN+, INMin 1.6 + VID/2 100 VCC – VOUT 400 800 45 49 Typ Max VCC – VID/2 2000 Units V mVP−P V mVP-P mVP-P mA AC Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3). Symbol Parameter DRMAX tLHT tHLT tPLHD tPHLD tTJ Maximum Data Rate Output Low to High Transition Time Output High to Low Transition Time Propagation Low to High Delay Propagation High to Low Delay Total Jitter (Note 4) (Note 4) 1.5 Gbps 0.95 0.95 Conditions (Note 4) 20% – 80%, (Note 6) Reference IN+, INOUT+, OUTMin 1.5 Typ 2.0 120 120 1.10 1.10 26 220 220 1.35 1.35 Max Units Gbps ps ps ns ns psP-P Note 1: "Absolute Maximum Ratings" are those parameter values beyond which the life and operation of the device cannot be guaranteed. The stating herein of these maximums shall not be construed to imply that the device can or should be operated at or beyond these values. The table of "Electrical Characteristics" specifies acceptable device operating conditions. Note 2: Current flow into device pins is defined as positive. Current flow out of device pins is defined as negative. All voltages are stated referenced to GND. Note 3: Typical values are stated for VCC = +3.3V and TA = +25°C. Note 4: Specification is guaranteed by characterization. Note 5: Maximum ICC is measured at VCC = +3.465V and TA = +70°C. Note 6: Specification is guaranteed by characterization and verified by test. www.national.com 2 DS15BA101 Connection Diagram 20199901 8-Pad LLP Order Number DS15BA101SD or DS15BA101SDX See NS Package Number SDA08A Pin Descriptions Pin # 1 2 3 4 5 6 7 8 IN+ INGND RVO VCC GND OUTOUT+ Name Description Non-inverting input pin. Inverting input pin. Circuit common (ground reference). Output voltage amplitude control. Connect a resistor to VCC to set output voltage. Positive power supply (+3.3V). Circuit common (ground reference). Non-inverting output pin. Inverting output pin. Device Operation INPUT INTERFACING The DS15BA101 accepts either differential or single-ended input. The inputs are self-biased, allowing for simple AC or DC coupling. DC-coupled inputs must be kept within the specified common-mode range. The IN+ and IN- are self-biased at approximately 2.1V with VCC = 3.3V. OUTPUT INTERFACING The DS15BA101 uses current mode outputs. Single-ended output levels are 400 mVP-P into AC-coupled 100Ω differential cable (with RVO = 953Ω) or into AC-coupled 50Ω coaxial cable (with RVO = 487Ω). Output level is controlled by the value of the RVO resistor connected between the RVO and VCC. The RVO resistor should be placed as close as possible to the RVO pin. In addition, the copper in the plane layers below the RVO network should be removed to minimize parasitic capacitance. 3 www.national.com DS15BA101 Physical Dimensions inches (millimeters) unless otherwise noted 8-Pad LLP Order Number DS15BA101SD or DS15BA101SDX NS Package Number SDA08A www.national.com 4 DS15BA101 Notes 5 www.national.com DS15BA101 1.5 Gbps Differential Buffer with Adjustable Output Voltage Notes THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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