LMH0024_08 NSC | Alldatasheet

Document overview

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Technical content

Features

■ SMPTE 259M and SMPTE 344M compliant ■ Supports DVB-ASI at 270 Mbps ■ Data rates: 143 Mbps to 540 Mbps ■ Equalizes up to 350 meters of Belden 1694A at 270 Mbps ■ Manual bypass, cable length indicator, and output mute ■ Single-ended or differential input ■ 50Ω differential outputs ■ Single 3.3V supply operation ■ Industrial temperature range: −40°C to +85°C ■ 198mW typical power consumption with 3.3V supply ■ Footprint compatible with the LMH0034 and the GS9064

Applications

■ SMPTE 259M and SMPTE 344M serial digital interfaces ■ Serial digital data equalization and reception ■ Data recovery equalization Typical Application 20172501 © 2008 National Semiconductor Corporation 201725 www.national.com LMH0024 3.3V SMPTE 259M / 344M Adaptive Cable Equalizer

Absolute Maximum Ratings (Note 1) Supply Voltage −0.5V to 3.6V Input Voltage (all inputs) −0.3V to VCC+0.3V Storage Temperature Range −65°C to +150°C Junction Temperature +150°C Lead Temperature (Soldering 4 Sec) +260°C Package Thermal Resistance θJA 16-pin SOIC θJC 16-pin SOIC +115°C/W +105°C/W ESD Rating (HBM) 8kV ESD Rating (MM) 250V Recommended Operating Conditions Supply Voltage (VCC – VEE) 3.3V ±5% Input Coupling Capacitance 1.0 µF AEC Capacitor (Connected between AEC+ and AEC-) 1.0 µF Operating Free Air Temperature (TA) −40°C to +85°C Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Notes 2, 3). Symbol Parameter Conditions Reference Min Typ Max Units VCMIN Input Common Mode Voltage SDI, SDI 1.9 V VSDI Input Voltage Swing At LMH0024 input, (Notes 4, 6) 720 800 950 mVP−P VCMOUT Output Common Mode Voltage SDO, SDO VCC – VSDO/2 V VSDO Output Voltage Swing 50Ω load, differential 750 mVP-P CLI DC Voltage 0m cable CLI 2.5 V no signal 1.2 V MUTE Input Voltage Min to mute outputs MUTE 3.0 V Max to force outputs active 2.0 V ICC Supply Current (Note 7) 60 77 mA www.national.com 2 LMH0024

Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3). Symbol Parameter Conditions Reference Min Typ Max Units BRSDI Input Data Rate SDI, SDI 143 540 Mbps Maximum Equalized Cable Length (with equalizer pathological)

270 Mbps, Belden 1694A,

0.2UI output jitter, (Note 4) 350 m

270 Mbps, Belden 8281,

0.2UI output jitter, (Note 4) 280 m

540 Mbps, Belden 1694A,

0.2UI output jitter, (Note 4) 250 m

540 Mbps, Belden 8281,

0.2UI output jitter, (Note 4) 180 m tr,tf Output Rise Time, Fall Time 20% – 80%, (Note 4) SDO, SDO 100 220 ps Mismatch in Rise/Fall Time (Note 4) 2 15 ps tOS Output Overshoot (Note 4) 1 5 % ROUT Output Resistance single-ended, (Note 5) 50 Ω RLIN Input Return Loss (Note 8) SDI, SDI 15 18-20 dB RIN Input Resistance single-ended 1.3 kΩ CIN Input Capacitance single-ended, (Note 5) 1 pF 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 VEE = 0 Volts. Note 3: Typical values are stated for VCC = +3.3V and TA = +25°C. Note 4: Specification is guaranteed by characterization. Note 5: Specification is guaranteed by design. Note 6: The maximum input voltage swing assumes a nonstressing, DC-balance signal; specifically, the SMPTE-recommended color bar test signal. Pathological or other stressing signals may not be used. This specification is for 0m cable only. Note 7: Supply current depends on the amount of cable being equalized. The current is highest for short cable and decreases as the cable length is increased. Refer to Figure 1. Note 8: Input return loss is dependent on board design. The LMH0024 meets this specification on the SD024 evaluation board from 5MHz to 1.5GHz. 3 www.national.com LMH0024

See NS Package Number M16A Pin Descriptions Pin # Name Description 1 CLI Cable length indicator. Provides a voltage inversely proportional to the cable length being equalized. 2 VCC Positive power supply (+3.3V). 3 VEE Negative power supply (ground). 4 SDI Serial data true input. 5 SDI Serial data complement input. 6 VEE Negative power supply (ground). 7 AEC+ AEC loop filter external capacitor (1µF) positive connection. 8 AEC- AEC loop filter external capacitor (1µF) negative connection. 9 BYPASS Bypasses equalization and DC restoration when high. No equalization occurs in this mode. 10 NC No connect. 11 VEE Negative power supply (ground). 12 SDO Serial data complement output. 13 SDO Serial data true output. 14 VEE Negative power supply (ground). 15 VCC Positive power supply (+3.3V). 16 MUTE Output mute. To force SDO and SDO to mute, tie to VCC. To disable MUTE, tie to GND. Typical application is MUTE tied to GND to enable the outputs. MUTE must be tied either high or low; it may not be left unconnected. www.national.com 4 LMH0024

The Equalizer Filter block is a multi-stage adaptive filter. If Bypass is high, the equalizer filter is disabled. The DC Restoration / Level Control block receives the dif- ferential signals from the equalizer filter block. This block incorporates a self-biasing DC restoration circuit to fully DC restore the signals. If Bypass is high, this function is disabled. The signals before and after the DC Restoration / Level Con- trol block are used to generate the Automatic Equalization Control (AEC) signal. This control signal sets the gain and bandwidth of the equalizer filter. The loop response in the AEC block is controlled by an external 1µF capacitor placed across the AEC+ and AEC- pins. Cable Length Indicator (CLI) is derived from this block. The Output Driver produces SDO and SDO. SDO and SDO may be forced to mute by activating MUTE. CABLE LENGTH INDICATOR (CLI) The cable length indicator provides a voltage to indicate the length of cable being equalized. The CLI voltage decreases as the cable length increases. MUTE MUTE can be used to manually mute or enable the LMH0024 outputs. MUTE must be tied to a low-level input or ground for SDO and SDO to be active. Applying a high input to MUTE will mute the LMH0024 outputs. INPUT INTERFACING The LMH0024 accepts either differential or single-ended in- put. The input must be AC coupled. Transformer coupling is not supported. The LMH0024 correctly handles equalizer pathological sig- nals for standard definition serial digital video, as described in SMPTE RP 178. OUTPUT INTERFACING The SDO and SDO outputs are internally loaded with 50 Ω. They produce a 750 mV P-P differential output, or a 375 mVP-P single-ended output.

Application Information

PCB LAYOUT RECOMMENDATIONS Please refer to the following Application Note for the CLC034 on National's website: AN-1372, “LMH0034 PCB Layout Techniques.” The PCB layout techniques in this application note apply to the LMH0024 as well. REPLACING THE GENNUM GS9064 The LMH0024 is footprint compatible with the Gennum GS9064. Pin 16 (MUTE) of the LMH0024 must be connect to ground for correct operation. SUPPLY CURRENT VS. CABLE LENGTH The supply current (ICC) depends on the amount of cable be- ing equalized. The current is highest for short cable and decreases as the cable length is increased. Figure 1 shows supply current vs. Belden 1694A cable length for 270 Mbps data. 5 www.national.com LMH0024

FIGURE 1. Supply Current vs. Belden 1694A Cable

Physical Dimensions inches (millimeters) unless otherwise noted 16-Pin SOIC Order Number LMH0024MA 7 www.national.com LMH0024

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