ZHCSOB1A october 2021 – june 2023 LMK1D1208P
PRODUCTION DATA
The two inputs of the LMK1D1208P are internally muxed together and can be selected through the control pin (see Table 9-2). Unused inputs can be left floating to reduce overall component cost. Both AC- and DC-coupling schemes can be used with the LMK1D1208P to provide greater system flexibility.
| IN_SEL | ACTIVE CLOCK INPUT |
|---|---|
| 0 | IN0_P, IN0_N |
| 1 | IN1_P, IN1_N |
| Open | None (1) |
The outputs of the LMK1D1208P can be individually enabled or disabled using the OEx hardware pins (see Table 9-3). The disabled state of the outputs is Hi-Z (high impedance) as this reduces the power consumption and also prevents back-biasing of the devices connected to these outputs.
Unused outputs should be disabled to eliminate the need for a termination resistor. In the case of enabled unused outputs, TI recommends a 100-Ω termination for optimal performance.
| OEx | CLOCK OUTPUTS |
|---|---|
| 0 | OUTPx, OUTNx disabled in Hi-Z state |
| 1 (default) | OUTPx, OUTNx enabled |
The output amplitude of the banks of the LMK1D1208P can be selected through the amplitude selection pin (see Table 9-4). The higher output amplitude mode (boosted LVDS swing mode) can be used in applications which require higher amplitude either for better noise performance (higher slew rate) or if the receiver has swing requirements which the standard LVDS swing cannot meet.
| AMP_SEL | OUTPUT AMPLITUDE (mV) |
|---|---|
| 0 | Bank 0: boosted LVDS swing (500 mV) Bank 1: standard LVDS swing (350 mV) |
| OPEN | Bank 0: standard LVDS swing (350 mV) Bank 1: standard LVDS swing (350 mV) |
| 1 | Bank 0: boosted LVDS swing (500 mV) Bank 1: boosted LVDS swing (500 mV) |