Figure 5 - Digital Output Characteristics
N
N+1
CLK IN
2.4 V
Rise Time
6 ns
6 ns
typ.
3.5 V
DATA OUT
(Actual)
2.4 V
(N-2)
0.8 V
0.5 V
Invalid
Data
(N-1)
Invalid
Data
(N)
t
pd1
(14 ns typ.)
DATA OUT
(Equivalent)
(N-2)
Invalid
Data
(N-1)
Invalid
Data
(N-1)
OVERRANGE OUTPUT
The overrange output (D12) is an indication that the analog
input signal has exceeded the full scale input voltage by
1 LSB. When this condition occurs, the outputs will switch to
logic 1s. All other data outputs are unaffected by this opera-
tion. This feature makes it possible to include the SPT7922
into higher resolution systems.
EVALUATION BOARD
The EB7922 evaluation board is available to aid designers in
demonstrating the full performance of the SPT7922. This
board includes a reference circuit, clock driver circuit, output
data latches and an on-board reconstruction of the digital
data. An application note (AN7922) describing the operation
of this board as well as information on the testing of the
SPT7922 is also available. Contact the factory for price and
availability.
SPT7922
9
3/10/97
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
