LMH1982SQE/NOPB Part Information

Details for LMH1982SQE/NOPB by Texas Instruments

Semiconductors - ICs>Clock Timing & Frequency Management>Clock Synthesizers & Generators

Part Description

The LMH1982 device is a multi-rate video clock generator ideal for use in a wide range of 3-Gbps (3G), high-definition (HD), and standard-definition (SD) video applications, such as video synchronization, serial digital interface (SDI) serializer and deserializer (SerDes), video conversion, video editing, and other broadcast and professional video systems. The LMH1982 can generate two simultaneous SD and HD clocks and a Top of Frame (TOF) pulse. In genlock mode, the device's phase locked loops (PLLs) can synchronize the output signals to H sync and V sync input signals applied to either of the reference ports. The input reference can have analog timing from Texas Instrument's LMH1981 multi-format video sync separator or digital timing from an SDI deserializer and should conform to the major SD and HD standards. When a loss of reference occurs, the device can default to free run operation where the output timing accuracy will be determined by the external bias on the free run control voltage input. The LMH1982 can replace discrete PLLs and fieldprogrammable gate array (FPGA) PLLs with multiple voltage controlled crystal oscillators (VCXOs). Only one 27.0000 MHz VCXO and loop filter are externally required for genlock mode. The external loop filter as well as programmable PLL parameters can provide narrow loop bandwidths to minimize jitter transfer. HD clock output jitter as low as 40 ps peak-to-peak can help designers using FPGA SerDes meet stringent SDI output jitter specifications. The LMH1982 is offered in a space-saving 5 mm x 5 mm 32-pin WQFN package and provides low total power consumption of about 250 mW (typical).

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Part Features

  • 3.3-V and 2.5-V Supplies
  • External Loop Filter Allows Control of Loop Bandwidth, Jitter Transfer, and Lock Time Characteristics
  • Free Run or Holdover Operation on Loss of Reference
  • I2 C Interface and Control Registers
  • Low-Jitter Output Clocks May Be Directly Connected to an FPGA Serializer to Meet SMPTE SDI Jitter Specifications
  • Supports Cross-Locking of Input and Output Timing
  • Top of Frame (TOF) Pulse with Programmable Output Format Timing and Hi-Z Capability
  • Two Simultaneous LVDS Output Clocks with Selectable Frequencies and Hi-Z Capability: u2013 SD Clock: 27 MHz or 67.5 MHz u2013 HD Clock: 74.25 MHz, 74.25/1.001 MHz, 148.5 MHz or 148.5/1.001 MHz
  • Two reference ports (A and B) With H and V Sync Inputs
  • User-Defined Free Run Control Voltage Input

Part Specifications

Clock IC Type Clock Generator
Frequency 27MHz
No. of Outputs 2Outputs
Supply Voltage Min 3.135V
Supply Voltage Max 3.465V
Clock IC Case Style WQFN
No. of Pins 32Pins
Operating Temperature Min 0°C
Operating Temperature Max 70°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant Yes
MSL MSL 1 - Unlimited
SVHC No SVHC (27-Jun-2018)
RoHS Compliant

Alternative Part Descriptions

  • Texas Instruments,LMH1982SQE/NOPB,Clock | RS Components
  • MULTI-RATE VIDEO CLOCK GENERAT; Clock IC Type:Clock Generator; Frequency:27MHz; No. of Outputs:2Outputs; Supply Voltage Min:3.135V; Supply Voltage Max:3.465V; Clock IC Case Style:WQFN; No. of Pins:32Pins; Operating Temperature RoHS Compliant: Yes | Newark Electronics
  • Multi-rate video clock generator with Genlock | Texas Instruments

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