Figure 4 - Digital Output Characteristics
N
N+1
CLK In
2.4 V
6 ns
typ.
3.5 V
Rise Time
6 nsec
Data Out
(Actual)
2.4 V
(N-2)
0.8 V
0.5 V
Invalid
Data
(N-1)
Invalid
Data
(N)
tpd1
(14 ns typ.)
Data Out
(Equivalent)
(N-2)
Invalid
Data
(N-1)
Invalid
Data
(N-1)
OVERRANGE OUTPUT
The OVERRANGE OUTPUT (D10) is an indication that the
analog input signal has exceeded the positive full scale input
voltage by 1 LSB. When this condition occurs, D10 will switch
to logic 1. All other data outputs (D0 to D9) will remain at
logic 1 as long as D10 remains at logic 1. This feature makes
it possible to include the SPT7820 into higher resolution
systems.
EVALUATION BOARD
The EB7820 evaluation board is available to aid designers in
demonstrating the full performance of the SPT7820. This
board includes a reference circuit, clock driver circuit, output
data latches and an on-board reconstruction of the digital
data. An application note describing the operation of this
board as well as information on the testing of the SPT7820 is
also available. Contact the factory for price and availability.
SPT7820
8
3/11/97
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
