参数资料
型号: LTC1285IS8#TRPBF
厂商: Linear Technology
文件页数: 16/24页
文件大小: 0K
描述: IC A/D CONV SAMPLING 12BIT 8SOIC
标准包装: 2,500
位数: 12
采样率(每秒): 7.5k
数据接口: MICROWIRE?,串行,SPI?
转换器数目: 1
功率耗散(最大): 480µW
电压电源: 单电源
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 带卷 (TR)
输入数目和类型: 1 个差分,单极
23
LTC1285/LTC1288
TYPICAL APPLICATIONS N
U
39k
2.7V
LT1004-1.2
220k
39k
3
BATTERY MONITOR
INPUT 8V TO 16V
1
F
0.1
F
CS
CLK
DOUT
LTC1285
LTC1285/88 F15
–IN
VCC
VREF
GND
+IN
Figure 15. Micropower Battery Voltage Monitor
Figure 13. “Quick Look” Circuit for the LTC1285
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).
VREF is tied to VCC. VIN 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 DOUT outputs the data. The
output data from the DOUT 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.
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
A from the 2.7V supply at fSMPL = 0.1kHz and 30A to
62
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 VREF to 2VREF (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
VCC
RC
QA
QB
QC
QD
T
LOAD
74HC161
VIN
TO OSCILLOSCOPE
CLOCK IN 120kHz
LTC1285/88 F13
VCC
CLK
DOUT
LTC1285
+IN
–IN
GND
4.7
F
2.7V
VREF
CS
MSB
(B11)
VERTICAL: 2V/DIV
HORIZONTAL: 20s/DIV
LSB
(B0)
NULL
BIT
Figure 14. Scope Trace the LTC1285 “Quick Look” Circuit
Showing A/D Output 101010101010 (AAAHEX)
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