ltc1278-5 Linear Technology Corporation, ltc1278-5 Datasheet - Page 5

• Manufacturer Part Number: ltc1278-5
• Description: 12-bit, 500ksps Sampling A/d Converter With Shutdown
• Manufacturer: Linear Technology Corporation

TI I G CHARACTERISTICS
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 these pin voltages are taken below V
mode) or above V
can handle input currents greater than 60mA below V
unipolar mode) or above V
Note 4: When these pin voltages are taken below V
mode), they will be clamped by internal diodes. This product can handle
input currents greater than 60mA below V
without latch-up. These pins are not clamped to V
Note 5: AV
400kHz (LTC1278-4), 500kHz (LTC1278-5), t
specified.
Note 6: Linearity, offset and full-scale specifications apply for unipolar and
bipolar modes.
TYPICAL PERFORMANCE CHARACTERISTICS
–0.5
–1.0
W U
1.0
0.5
0
indicates specifications which apply over the full operating
0
Integral Nonlinearity vs
Output Code
f
SAMPLE
512 1024 1536 2048
DD
= DV
= 500kHz
DD
DD
, they will be clamped by internal diodes. This product
= V
CODE
DD
DD
= 5V, (V
without latch-up.
2560 3072 3584 4096
W
SS
= – 5V for bipolar mode), f
LT1278 G1
SS
U
(ground for unipolar mode)
r
= t
A
f
DD
= 25 C.
= 5ns unless otherwise
SS
SS
.
–0.5
–1.0
SS
(ground for unipolar
(ground for unipolar
1.0
0.5
0
(ground for
0
Differential Nonlinearity vs
Output Code
f
SAMPLE
(Note 5)
512 1024 1536 2048
SAMPLE
= 500kHz
=
CODE
Note 7: Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve. The
deviation is measured from the center of the quantization band.
Note 8: Bipolar offset is the offset voltage measured from – 1/2LSB when
the output code flickers between 0000 0000 0000 and 1111 1111 1111.
Note 9: Guaranteed by design, not subject to test.
Note 10: Recommended operating conditions.
Note 11: A
specified accuracy. Therefore the minimum supply voltage for the unipolar
mode is 4.95V. The minimum for the bipolar mode is 4.75V, – 2.45V.
Note 12: The falling CONVST edge starts a conversion. If CONVST returns
high at a bit decision point during the conversion it can create small errors.
For best performance ensure that CONVST returns high either within 120ns
after conversion start (i.e., before the first bit decision) or after BUSY rises
(i.e., after the last bit test). See mode 1a and 1b (Figures 12 and 13) timing
diagrams.
2560 3072 3584 4096
IN
LT1278 G2
must not exceed V
12
11
10
4
3
2
1
0
9
8
7
6
5
10k
ENOBs and S/(N D) vs
Input Frequency
f
SAMPLE
DD
or fall below V
= 500kHz
INPUT FREQUENCY (Hz)
100k
FREQUENCY
NYQUIST
SS
by more than 50mV for
LTC1278
1M
LT1278 G4
2M
74
68
62
56
5