1 Product Description

The LMX1860-SEP⁽¹⁾ is part of TI's family of Space Enhanced Plastic products⁽²⁾ released for space missions with reduced radiation and reliability requirements. The LMX1860-SEP⁽¹⁾ is a radiation hardened low noise, high frequency JESD buffer, multiplier, or divider. The flight grade part is orderable as LMX1860MPAPSEP or V62/24630-01XE ⁽³⁾. A LMX1860PAP/EM prototype (which did not receive full space grade processing and testing) can be ordered for engineering evaluation.

A block diagram of the LMX1860-SEP is shown in Figure 1-1. Each of the four high frequency clock outputs and additional LOGICLK output with a larger divider range is paired with a SYSREF output clock signal. The SYSREF signal for JESD interfaces can either be internally generated or passed in as an input and re-clocked to the device clocks. The main clock outputs are all the same frequency. This frequency can be the same, divided, or multiplied relative to the input clock. Each of these clock outputs features a programmable power level. The LOGICLK output frequency is independent and typically is lower frequency than the other four main clocks and features programmable output formats (CML or LVDS) and power level.

The LMX1860-SEP can be configured with control pins with a limited number of configuration options. The part can also be programmed through a Serial Peripheral Interface (SPI) with an expanded range of configuration options. In SPI mode, the programmed configuration is held in registers which can be read out. The device features an onboard temperature diode that can be read out through the SPI.

The operating voltage of the LMX1860-SEP is 2.4V to 2.6V, and the temperature range is -55°C to +125°C. The LMX1860-SEP is manufactured on a TI BiCMOS process with SiGe NPN bipolar transistors.