LTC2157-14 Datasheet, PDF (14/34 Pages) Linear Technology – Dual 14-Bit 250Msps

LTC2157-14/
LTC2156-14/LTC2155-14
PIN FUNCTIONS
LVDS Outputs
The following pins are differential LVDS outputs. The
output current level is programmable. There is an optional
internal 100Ω termination resistor between the pins of
each LVDS output pair.
OF^–/OF⁺ (Pins 22/23): Over/Underflow Digital Output.
OF⁺ is high when an overflow or underflow has occurred.
The overflows for channel A and channel B are multiplexed
together.
D_{B0_1–}/D_{B0_1+} to D_{B12_13–}/D_{B12_13+} (Pins 24/25, 26/27,
28/29, 30/31, 34/35, 36/37, 38/39): Channel B Double
Data Rate Digital Outputs. Two data bits are multiplexed
onto each differential output pair. The even data bits (DB0,
DB2, DB4, DB6, DB8, DB10, DB12) appear when CLKOUT⁺
is low. The odd data bits (DB1, DB3, DB5, DB7, DB9, DB11,
DB13) appear when CLKOUT⁺ is high.
CLKOUT^–/CLKOUT⁺ (Pins 40/41): Data Output Clock.
The digital outputs normally transition at the same time
as the falling and rising edges of CLKOUT⁺. The phase of
CLKOUT⁺ can also be delayed relative to the digital outputs
by programming the mode control registers.
D_{A0_1–}/D_{A0_1+} to D_{A12_13–}/D_{A12_13+} (Pins 42/43, 44/45,
46/47, 50/51, 52/53, 54/55, 56/57): Channel A Double
Data Rate Digital Outputs. Two data bits are multiplexed
onto each differential output pair. The even data bits (DA0,
DA2, DA4, DA6, DA8, DA10, DA12) appear when CLKOUT⁺
is low. The odd data bits (DA1, DA3, DA5, DA7, DA9, DA11,
DA13) appear when CLKOUT⁺ is high.
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