ML2264CCP データシートの表示（PDF） - Micro Linear Corporation
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ML2264CCP Datasheet PDF : 17 Pages
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(a) S/H Mode
WR
ACQUISITION
OR SAMPLING
PERIOD. ALL
COMPARATORS
AUTOZEROED.
MSB
COMPARATORS
DECIDING.
LSB
COMPARATORS
DECIDING.
ML2264
(a) T/H Mode
WR
CONVERSION
STARTS.
VIN SAMPLING
ENDS. HOLD
TIME STARTS.
MSB
COMPARATOR
RESULTS ARE
LATCHED.
RD BROUGHT LOW
LATCHES LSB
COMPARATOR
RESULTS AND
BRINGS INT LOW.
ALL
COMPARATORS
AUTOZEROED.
ACQUISITION
PERIOD. MSB
COMPARATORS
ARE TRACKING
VIN. LSB
COMPARATORS
ARE SAMPLING
VIN.
LSB
COMPARATORS
DECIDING.
CONVERSION
STARTS.
VIN SAMPLING
ENDS. MSB
COMPARATOR
RESULTS ARE
LATCHED.
RD BROUGHT LOW
LATCHES LSB
COMPARATOR
RESULTS AND
BRINGS INT LOW.
Figure 9. Operating Sequence (WR-RD Mode)
1.4 REFERENCE
The +VREF and –VREF inputs are the reference voltages that
determine the full scale and zero input voltages,
respectively, for the A/D converter. Thus, +VREF defines
the analog input which produces a full scale output and
–VREF defines the analog input which produces an output
code of all zeroes. The transfer function for the A/D
converter is shown in Figure 10.
+VREF and –VREF can be set to any voltage between GND
and VCC. This means that the reference voltages can be
offset from GND and the difference between +VREF+ and
–VREF– can be made small to increase the resolution of the
conversion. Note that the total unadjusted error increases
when [+VREF – (–VREF)] decreases.
1.5 POWER SUPPLY AND REFERENCE DECOUPLING
A 0.1µF ceramic disc capacitor is recommended to bypass
VCC to GND, using as short a lead length as possible.
If REF+ and REF– inputs are driven by long lines, they
should be bypassed by 0.1µF ceramic disc capacitors at
the reference input pins.
OUTPUT
CODE
11111111
11111110
11111101
FULL SCALE
TRANSITION
00000011
00000010
00000001
00000000
0
FS
FS – 1LSB
AIN, INPUT VOLTAGE (IN TERMS OF LSB’S)
Figure 10. A/D Transfer Characteristic
11
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