ML2264CCR MICRO-LINEAR [Micro Linear Corporation], ML2264CCR Datasheet - Page 11

• Manufacturer Part Number: ML2264CCR
• Description: 4-Channel High-Speed 8-Bit A/D Converter with T/H (S/H)
• Manufacturer: MICRO-LINEAR [Micro Linear Corporation]

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