MAX106CHC Maxim, MAX106CHC Datasheet - Page 22

• Manufacturer Part Number: MAX106CHC
• Description: 5V / 600Msps / 8-Bit ADC with On-Chip 2.2GHz Bandwidth Track/Hold Amplifier
• Manufacturer: Maxim

Finally, the reset signal is presented in differential PECL
format to the last block of the reset signal path.
RSTOUT+/RSTOUT- output the time-aligned reset sig-
nal used for resetting additional external demuxes in
applications where further reduction in the output data
rate is desired. Many demux devices require their reset
signal to be asserted for several clock cycles while they
are clocked. To accomplish this, the MAX106 DREADY
clock will continue to toggle while RSTOUT is asserted.
When a single MAX106 device is used, no synchroniz-
ing reset is required since the order of the samples in
the output ports is unchanged regardless of the phase
of the DREADY clock. In DIV2 mode, the data in the
auxiliary port is delayed by 8.5 clock cycles while the
data in the primary port is delayed by 7.5 clock cycles.
The older data is always in the auxiliary port, regardless
of the phase of the DREADY clock.
The reset output signal, RSTOUT, is delayed by one
fewer clock cycle (6.5 clock cycles) than the primary
port. The reduced latency of RSTOUT serves to mark
±5V, 600Msps, 8-Bit ADC with On-Chip
2.2GHz Bandwidth Track/Hold Amplifier
Figure 18. Reset Output Timing in Demuxed DIV2 Mode (DREADY Aligned)
22
DATA PORT
DATA PORT
DATA PORT
RESET OUT
AUXILIARY
PRIMARY
______________________________________________________________________________________
DREADY
RESET
INPUT
NOTE: THE LATENCY TO THE RESET OUTPUT IS 6.5 CLOCK CYCLES. THE LATENCY TO THE PRIMARY PORT IS 7.5 CLOCK CYCLES, AND
CLK
CLK+
CLK-
THE LATENCY TO THE AUXILIARY PORT IS 8.5 CLOCK CYCLES. ALL DATA PORTS ARE UPDATED ON THE RISING EDGE OF THE DREADY+ CLOCK.
n
RSTIN+
RSTIN-
DREADY+
DREADY-
ADC SAMPLE NUMBER
n+1
t
SU
n+2
RSTOUT+
RSTOUT-
n+3
t
HD
Reset Output
n+4
ADC SAMPLES ON THE RISING EDGE OF CLK+
n+5
n+6
the start of synchronized data in the primary and auxil-
iary ports. When the RSTOUT signal returns to a zero,
the DREADY clock phase is reset.
Since there are two possible phases of the DREADY
clock with respect to the input clock, there are two pos-
sible timing diagrams to consider. The first timing dia-
gram (Figure 18) shows the RSTOUT timing and data
alignment of the auxiliary and primary output ports
when the DREADY clock phase is already reset. For
this example, the RSTIN pulse is two clock cycles long.
Under this condition, the DREADY clock continues
uninterrupted, as does the data stream in the auxiliary
and primary ports.
The second timing diagram (Figure 19) shows the
results when the DREADY phase is opposite from the
reset phase. In this case, the DREADY clock “swallows”
a clock cycle of the sample clock, resynchronizing to
the reset phase. Note that the data stream in the auxil-
iary and primary ports has reversed. Before reset was
n+7
n+8
n-1
n
n+9
n+10
n+1
n+2
n+11
n+12
n+3
n+4
n+13