LTC1272-3CCS Linear Technology, LTC1272-3CCS Datasheet - Page 4

• Manufacturer Part Number: LTC1272-3CCS
• Description: 12-Bit/ 3us/ 250kHz Sampling A/D Converter
• Manufacturer: Linear Technology

LTC1272
SYMBOL
t
t
t
t
t
t
t
t
t
t
t
t
t
t
The
temperature range; all other limits and typicals T
Note 1: Absolute maximum ratings are those values beyond which the life
of a device may be impaired.
Note 2: All voltage values are with respect to ground with DGND and
AGND wired together, unless otherwise noted.
Note 3: When the analog input voltage is taken below ground it will be
clamped by an internal diode. This product can handle, with no external
diode, input currents of greater than 60mA below ground without latch-up.
Note 4: V
LTC1272-8, t
performance, the LTC1272 clock should be synchronized to the RD and
CS control inputs with at least 40ns separating convert start from the
nearest clock edge.
4
TI
1
2
3
4
5
6
7
8
9
10
11
12
13
CONV
W
indicates specifications which apply over the full operating
I
DD
U
= 5V, f
G
r
= t
PARAMETER
CS to RD Setup Time
RD to BUSY Delay
Data Access Time After RD
RD Pulse Width
CS to RD Hold Time
Data Setup Time After BUSY
Bus Relinquish Time
HBEN to RD Setup Time
HBEN to RD Hold Time
Delay Between RD Operations
Delay Between Conversions
Aperture Delay of Sample and Hold
CLK to BUSY Delay
Conversion Time
f
C
= 5ns unless otherwise specified. For best analog
CLK
HARA TERISTICS
= 4MHz for LTC1272-3, and 1.6MHz for
C
A
= 25 C.
(Note 8)
Jitter < 50ps
CONDITIONS
C
COM Grade
C
COM Grade
C
COM Grade
COM Grade
COM Grade
COM Grade
COM Grade
L
L
L
= 20pF
= 100pF
= 50pF
Note 5: Linearity error is specified between the actual end points of the
A/D transfer curve.
Note 6: The LTC1272 has the same 0V to 5V input range as the AD7572
but, to achieve single supply operation, it provides a 2.42V reference
output instead of the –5.25V of the AD7572. This requires that the polarity
of the reference bypass capacitor be reversed when plugging an LTC1272
into an AD7572 socket.
Note 7: Guaranteed by design, not subject to test.
Note 8: V
ensure compliance. All input control signals are specified with t
(10% to 90% of 5V) and timed from a voltage level of 1.6V. See Figures 13
through 17.
DD
= 5V. Timing specifications are sample tested at 25 C to
200
20
20
12
MIN
t
t
0
0
0
0
1
3
3
LTC1272-XA/C
TYP
80
50
70
40
30
25
80
MAX
190
230
110
125
150
170
220
90
70
90
75
85
13
r
= t
CYCLES
f
UNITS
= 5ns
CLK
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
s