Datasheet

20
LTC1274/LTC1277
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX : [phone]
●
TELEX : 499-3977
© LINEAR TECHNOLOGY CORPORATION 1995
LT/GP 1195 10K • PRINTED IN USA
U
S
A
O
PP
L
IC
AT
I
WU
U
I FOR ATIO
U
PACKAGE
D
E
SC
R
I
PTI
O
Dimensions in inches (millimeters) unless otherwise noted.
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
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LTC1278 12-Bit, 500ksps Sampling A/D Converter with Shutdown 70dB SINAD at Nyquist, Low Power
LTC1279 12-Bit, 600ksps Sampling A/D Converter with Shutdown 70dB SINAD at Nyquist, Low Power
LTC1282 12-Bit, 140ksps Sampling A/D Converter with Reference 3V or ±3V ADC with Reference, Clock
LTC1409 12-Bit, 800ksps Sampling A/D Converter with Shutdown Fast, Complete Low Power ADC, 80mV
LTC1410 12-Bit, 1.25Msps Sampling A/D Converter with Shutdown Fast, Complete Wideband ADC, 160mV
In the Sleep mode, the comparator of the ADC will start
consuming power after the rising edge of SLEEP as shown
in Figure 18a. If REFRDY is tied to NAP, the comparator will
be powered up after REFRDY’s rising edge. Hence more
power will be saved as in Figure 18b.
REFRDY
COMPARATOR
STATUS
ON OFF ON
LTC1274/77 • F18a
SLEEP
3ms
(C
REF
= 4.7µF)
NAP = REFRDY
COMPARATOR
STATUS
ON OFF ON
LTC1274/77 • F18b
SLEEP
3ms
(C
REF
= 4.7µF)
Figure 18a. Power Saved in Sleep Mode (NAP = HIGH) Figure 18b. Power Saved in Sleep Mode (NAP = REFRDY)
SW Package
24-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
NOTE 1
0.598 – 0.614*
(15.190 – 15.600)
22 21 20 19 18
17
16 15
1
23
4
5
6
78
0.394 – 0.419
(10.007 – 10.643)
910
1314
11 12
2324
0.037 – 0.045
(0.940 – 1.143)
0.004 – 0.012
(0.102 – 0.305)
0.093 – 0.104
(2.362 – 2.642)
0.050
(1.270)
TYP
0.014 – 0.019
(0.356 – 0.482)
0° – 8° TYP
NOTE 1
0.009 – 0.013
(0.229 – 0.330)
0.016 – 0.050
(0.406 – 1.270)
0.291 – 0.299**
(7.391 – 7.595)
×
45
°
0.010 – 0.029
(0.254 – 0.737)
NOTE:
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS.
DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
*
**