參數(shù)資料
型號(hào)： LTC1285CN8
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 3V Micropower Sampling 12-Bit A/D Converters in SO-8 Packages
中文描述： 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 23/24頁(yè)
文件大?。?/td> 412K
代理商： LTC1285CN8
23
LTC1285/LTC1288
TYPICAL APPLICATIO
S
N
A “Quick Look” Circuit for the LTC1285
Users can get a quick look at the function and timing of the
LT1285 by using the following simple circuit (Figure 13).
V
REF
is tied to V
CC
. V
IN
is applied to the +IN input and the
–IN input is tied to the ground. CS is driven at 1/16 the
clock rate by the 74C161 and D
OUT
outputs the data. The
output data from the D
OUT
pin can be viewed on an
oscilloscope that is set up to trigger on the falling edge of
CS (Figure 14). Note the LSB data is partially clocked out
before CS goes high.
U
39k
2.7V
LT1004-1.2
220k
39k
3
BATTERY MONITOR
INPUT 8V TO 16V
1
μ
F
0.1
μ
F
CS
CLK
D
OUT
LTC1285
LTC1285/88 F15
–IN
V
CC
V
REF
GND
+IN
Figure 15. Micropower Battery Voltage Monitor
Figure 13. “Quick Look” Circuit for the LTC1285
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Micropower Battery Voltage Monitor
A common problem in battery systems is battery voltage
monitoring. This circuit monitors the 10 cell stack of NiCad
or NiMH batteries found in laptop computers. It draws only
40
μ
A from the 2.7V supply at f
SMPL
= 0.1kHz and 30
μ
A to
62
μ
A from the battery. The 12-bits of resolution of the
LTC1285 are positioned over the desired range of 8V to
16V. This is easily accomplished by using the ADC’s
differential inputs. Tying the –input to the reference gives
an ADC input span of V
REF
to 2V
REF
(1.2V to 2.4V). The
resistor divider then scales the input voltage for 8V to 16V.
CLR
CLK
A
B
C
D
P
GND
V
CC
RC
QA
QB
QC
QD
T
LOAD
74HC161
V
IN
TO OSCILLOSCOPE
CLOCK IN 120kHz
LTC1285/88 F13
V
CC
CLK
D
OUT
LTC1285
V
REF
+IN
–IN
GND
4.7
μ
F
2.7V
CS
MSB
(B11)
VERTICAL: 2V/DIV
HORIZONTAL: 20μs/DIV
LSB
(B0)
NULL
BIT
Figure 14. Scope Trace the LTC1285 “Quick Look” Circuit
Showing A/D Output 101010101010 (AAA
HEX
)
相關(guān)PDF資料
PDF描述
LTC1285CS8 3V Micropower Sampling 12-Bit A/D Converters in SO-8 Packages
LTC1288 Single Channel Codec-Bandwidth Independent of Sampling Rate 28-PLCC 0 to 70
LTC1288CS8 3V Micropower Sampling 12-Bit A/D Converters in SO-8 Packages
LTC1289BC 3 Volt Single Chip 12-Bit Data Acquisition System
LTC1289CCJ 3 Volt Single Chip 12-Bit Data Acquisition System
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LTC1285CN8PBF 制造商:Linear Technology 功能描述:LTC1285CN8PBF
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