DIGITAL
參數(shù)資料
型號(hào): XRD8799EVAL
廠商: Exar Corporation
文件頁(yè)數(shù): 5/24頁(yè)
文件大?。?/td> 0K
描述: EVAL BOARD FOR XRD8799
產(chǎn)品變化通告: Obsolescence Notification 15/Apr/2010
標(biāo)準(zhǔn)包裝: 1
系列: *
XRD8799
xr
LOW POWER, 2 MSPS, 10-BIT, A/D CONVERTER WITH 8-CHANNEL MUX
REV. 1.00
13
1.6
DIGITAL INTERFACES
The logic encodes the outputs of the comparators in-
to a binary code and latches the data in a D-type flip-
flop for output.
The functional equivalent of the XRD8799 (Figure 14)
is composed of:
1. Delay stage (tAP) from the clock to the sampling
phase (fS).
2. An ideal analog switch which samples VIN.
3. An ideal A/D which tracks and converts VIN with
no delay.
4. A series of two DFF's with specified hold (tHLD)
and delay (tDL) times.
tAP, tHLD and tDL are specified in the Electrical Charac-
teristics table.
1.7
POWER DOWN
Figure 15 shows the relationship between the clock,
sampled VIN to output data relationship and the effect
of power down.
FIGURE 14. XRD8799 FUNCTIONAL EQUIVALENT CIR-
CUIT AND
INTERFACE TIMING
FIGURE 15. POWER DOWN TIMING DIAGRAM
φ
VIN
S
A/D
XRD8799
CLK
DB9-DB0
N
N+1
N-1
N
t
DL
t
HLD
D
Q
D
Q
DB9-DB0
CLK
VIN
t
AP
N-2 Valid
DB0-DB9
CLK
VIN
PD
IDD, IVREF(+)
SAMPLE
N
SAMPLE
M
SAMPLE
M+1
N-1 Valid
N Valid
M Valid
t
CLKS1
t
CLKH1
t
PD
t
PU
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