LMH0044SQX

LMH0044 www.ti.com SNLS216E – APRIL 2006 – REVISED APRIL 2013 LMH0044 SMPTE 292M / 259M Adaptive Cable Equalizer Check for Samples: LMH0044 FEATURES DESCRIPTION • The LMH0044 SMPTE 292M / 259M adaptive cable equalizer is a monolithic integrated circuit for equalizing data transmitted over cable (or any media with similar dispersive loss characteristics). The equalizer operates over a wide range of data rates from 125 Mbps to 1.485 Gbps and supports SMPTE 292M, SMPTE 344M and SMPTE 259M. 1 2 • • • • • • • • • SMPTE 292M, SMPTE 344M and SMPTE 259M Compliant Supports DVB-ASI at 270 Mbps Data rates: 125 Mbps to 1.485 Gbps Equalizes up to 200 Meters of Belden 1694A at 1.485 Gbps or up to 400 meters of Belden 1694A at 270 Mbps Manual Bypass and Output Mute with a Programmable Threshold Single-Ended or Differential Input 50Ω Differential Outputs Single 3.3V Supply Operation 208 mW Typical Power Consumption with 3.3V Supply Replaces the GS1574 and GS1574A The LMH0044 implements DC restoration to correctly handle pathological data conditions (DC restoration may be bypassed for low data rate applications). The equalizer may be driven in either a single ended or differential configuration. Additional features include separate carrier detect and output mute pins which may be tied together to mute the output when no signal is present. A programmable mute reference is provided to mute the output at a selectable level of signal degradation. APPLICATIONS • • • SMPTE 292M, SMPTE 344M, and SMPTE 259M Serial Digital Interfaces Serial Digital Data Equalization and Reception Data Recovery Equalization Typical Application 6.8 nH Coaxial Cable 1 PF LMH0044 Adaptive Cable Equalizer SDI SDO SDI SDO 4.7 PF 75: Outputs 75: 4.7 PF 1 PF 37.4: MUTE MUTE CD MUTEREF AEC+ AECBYPASS 1 PF CD MUTEREF BYPASS 1 2 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. All 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. Copyright © 2006–2013, Texas Instruments Incorporated LMH0044 SNLS216E – APRIL 2006 – REVISED APRIL 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) (2) −0.5V to 3.6V Supply Voltage −0.3V to VCC+0.3V Input Voltage (all inputs) −65°C to +150°C Storage Temperature Range Junction Temperature +150°C Lead Temperature (Soldering 4 Sec) Package Thermal Resistance +260°C θJA 16-pin WQFN +43°C/W θJC 16-pin WQFN +9°C/W ESD Rating (HBM) 8kV ESD Rating (MM) (1) (2) 250V "Absolute Maximum Ratings" are those parameter values beyond which the life and operation of the device cannot be ensured. 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. If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and specifications. 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) 0°C to +85°C DC Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (1) (2). Parameter VCMIN Test Conditions Input Common Mode Voltage VSDI Input Voltage Swing VCMOUT Output Common Mode Voltage VSDO Output Voltage Swing Reference Min SDI, SDI At LMH0044 input (3) (4) 720 50Ω load, differential MUTEREF MUTEREF Range CD Output Voltage Carrier not present CD 2.6 MUTE 3.0 800 Min to mute outputs (1) (2) (3) (4) (5) 2 Supply Current V 950 750 mVP-P 1.3 V 0.7 V V 0.4 See (5) mVP−P V V V Max to force outputs active ICC Units VCC – VSDO/2 Carrier present MUTE Input Voltage Max 1.9 SDO, SDO MUTEREF DC Voltage (floating) Typ 63 0.8 V 77 mA 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. Typical values are stated for VCC = +3.3V and TA = +25°C. Specification is ensured by characterization. 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. 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 2 and Figure 3. Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LMH0044 LMH0044 www.ti.com SNLS216E – APRIL 2006 – REVISED APRIL 2013 AC Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (1). Parameter BRMIN Minimum Input Data Rate BRMAX Maximum Input Data Rate Jitter for various Cable Lengths (with equalizer pathological) tr,tf tOS Test Conditions Typ Max 125 Units Mbps 1485 Mbps 270 Mbps, Belden 1694A, 400 meters (2) 0.2 UI 270 Mbps, Belden 8281, 280 meters (2) 0.2 UI 1.485 Gbps, Belden 1694A, 140 meters (2) 0.25 UI 1.485 Gbps, Belden 8281, 100 meters (2) 0.25 UI 1.485 Gbps, Belden 1694A, 200 meters (2) 0.3 UI Output Rise Time, Fall Time 20% – 80% (2) 100 220 ps Mismatch in Rise/Fall Time See (2) 2 15 ps Output Overshoot See (2) 1 5 % Output Resistance Single-Ended RLIN Input Return Loss See (4) RIN Input Resistance Single-Ended (1) (2) (3) (4) Min SDI, SDI ROUT CIN Reference Input Capacitance SDO, SDO (3) SDI, SDI Single-Ended 15 (3) 50 Ω 18-20 dB 1.3 kΩ 1 pF Typical values are stated for VCC = +3.3V and TA = +25°C. Specification is ensured by characterization. Specification is ensured by design. Input return loss is dependent on board design. The LMH0044 meets this specification on the SD044 evaluation board from 5 MHz to 1.5 GHz. SDI 3 VEE 4 CD MUTE VCC 13 LMH0044 (top view) 5 6 7 8 MUTEREF 2 14 BYPASS SDI 15 AEC- 1 16 AEC+ VEE VCC Connection Diagram 12 VEE 11 SDO 10 SDO 9 VEE The exposed die attach pad is a negative electrical terminal for this device. It should be connected to the negative power supply voltage. Figure 1. 16-Pin WQFN Package See Package Number RUM0016A Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LMH0044 3 LMH0044 SNLS216E – APRIL 2006 – REVISED APRIL 2013 www.ti.com Table 1. Pin Descriptions Pin No. Name Description 1 VEE Negative power supply (ground). 2 SDI Serial data true input. 3 SDI Serial data complement input. 4 VEE Negative power supply (ground). 5 AEC+ AEC loop filter external capacitor (1µF) positive connection. 6 AEC- AEC loop filter external capacitor (1µF) negative connection. 7 BYPASS Bypasses equalization and DC restoration when high. No equalization occurs in this mode. 8 MUTEREF Mute reference. Sets the threshold for CD and (with CD tied to MUTE) determines the maximum cable to be equalized before muting. MUTEREF may be unconnected for maximum equalization. 9 VEE Negative power supply (ground). 10 SDO Serial data complement output. 11 SDO Serial data true output. 12 VEE Negative power supply (ground). 13 VCC Positive power supply (+3.3V). 14 MUTE Output mute. To disable the mute function and enable the output, MUTE must be tied to GND or a low level signal. To force the outputs to a muted state, tie to VCC. CD may be tied to this pin to inhibit the output when no input signal is present. MUTE has no function in BYPASS mode. 15 CD Carrier detect. CD is high when no signal is present. CD has no function in BYPASS mode. 16 VCC Positive power supply (+3.3V). DAP VEE Connect exposed DAP to negative power supply. Block Diagram BYPASS Output Driver SDI SDI DC Restoration/ Level Control Equalizer Filter Energy Detect SDO SDO Energy Detect 6 Automatic Equalization Control Carrier Detect/ Mute CD MUTE MUTEREF AEC+ 4 AEC- Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LMH0044 LMH0044 www.ti.com SNLS216E – APRIL 2006 – REVISED APRIL 2013 Device Operation BLOCK DESCRIPTION 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 differential 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 Control 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 AECpins. The Carrier Detect / Mute block generates the carrier detect signal and controls the mute function of the output. This block utilizes the CD and MUTE signals along with Mute Reference (MUTEREF). The Output Driver produces SDO and SDO. MUTE REFERENCE (MUTEREF) The mute reference sets the threshold for CD and (with CD tied to MUTE) determines the amount of cable to equalize before automatically muting the outputs. This is set by applying a voltage inversely proportional to the length of cable to equalize. As the applied MUTEREF voltage is increased, the amount of cable that can be equalized before carrier detect is de-asserted and the outputs are muted is decreased. MUTEREF may be left unconnected for maximum equalization before muting. CARRIER DETECT (CD) AND MUTE Carrier detect CD indicates if a valid signal is present at the LMH0044 input. If MUTEREF is used, the carrier detect threshold will be altered accordingly. CD provides a high voltage when no signal is present at the LMH0044 input. CD is low when a valid input signal is detected. MUTE can be used to manually mute or enable SDO and SDO. Applying a high input to MUTE will mute the LMH0044 outputs. Applying a low input will force the outputs to be active. CD and MUTE may be tied together to automatically mute the output when no input signal is present. INPUT INTERFACING The LMH0044 accepts either differential or single-ended input. The input must be AC coupled. Transformer coupling is not supported. The LMH0044 correctly handles equalizer pathological signals for standard definition and high definition serial digital video, as described in SMPTE RP 178 and RP 198, respectively. OUTPUT INTERFACING The SDO and SDO outputs are internally loaded with 50Ω. They produce a 750 mVP-P differential output, or a 375 mVP-P single-ended output. Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LMH0044 5 LMH0044 SNLS216E – APRIL 2006 – REVISED APRIL 2013 www.ti.com APPLICATION INFORMATION PCB LAYOUT RECOMMENDATIONS Refer to the following Application Note on TI's website: AN-1372, “LMH0034 PCB Layout Techniques.” The PCB layout techniques in the application note apply to the LMH0044 as well. REPLACING THE GENNUM GS1574A The LMH0044 is footprint compatible with the Gennum GS1574A. SUPPLY CURRENT VS. CABLE LENGTH The supply current (ICC) depends on the amount of cable being equalized. The current is highest for short cable and decreases as the cable length is increased. Figure 2 shows supply current vs. Belden 1694A cable length for 1.485 Gbps data and Figure 3 shows supply current vs. Belden 1694A cable length for 270 Mbps data. SUPPLY CURRENT (mA) 75 70 65 60 55 0 50 100 150 200 BELDEN 1694A CABLE LENGTH (m) Figure 2. Supply Current vs. Belden 1694A Cable Length, 1.485 Gbps 6 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LMH0044 LMH0044 www.ti.com SNLS216E – APRIL 2006 – REVISED APRIL 2013 SUPPLY CURRENT (mA) 75 70 65 60 55 0 100 200 300 400 BELDEN 1694A CABLE LENGTH (m) Figure 3. Supply Current vs. Belden 1694A Cable Length, 270 Mbps Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LMH0044 7 LMH0044 SNLS216E – APRIL 2006 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision D (April 2013) to Revision E • 8 Page Changed layout of National Data Sheet to TI format ............................................................................................................ 7 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LMH0044 PACKAGE OPTION ADDENDUM www.ti.com 10-Dec-2020 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) (4/5) (6) LMH0044SQ/NOPB ACTIVE WQFN RUM 16 1000 RoHS & Green SN Level-1-260C-UNLIM 0 to 85 L044 LMH0044SQE/NOPB ACTIVE WQFN RUM 16 250 RoHS & Green SN Level-1-260C-UNLIM 0 to 85 L044 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of