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参数资料
| 型号： | LTC1040CSW#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR LOW PWR DUAL18SOIC |
| 标准包装： | 1,000 |
| 系列： | LTCMOS™ |
| 类型： | 通用 |
| 元件数： | 2 |
| 输出类型： | CMOS，TTL |
| 电压 - 电源，单路/双路(±)： | 2.8 V ~ 16 V，±2.8 V ~ 8 V |
| 电压 - 输入偏移（最小值）： | 4.5mV @ ±8V |
| 电流 - 输入偏压（最小值）： | 300pA @ ±5V |
| 电流 - 静态（最大值）： | 3mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 18-SOIC（0.295"，7.50mm 宽） |
| 安装类型： | 表面贴装 |
| 包装： | 带卷 (TR) |
8
LTC1040
1040fa
Output Logic
In addition to the normal outputs (AOUT and BOUT), two
additional outputs, A + B and ON/0FF, are provided (see
Figure 8 and Table 1). All logic is powered from V+ and
ground, thus input and output logic levels are independent
of the V – supply. The LTC1040 is directly compatible with
CMOS logic and is TTL compatible for 4.75V
≤ V+ ≤ 5.25V.
No external pull-up resistors are required.
ΣA INPUTS
ΣB INPUTS
AOUT
BOUT
A + B
ON/OFF
++
H
L
+–
H
L
–+
L
H
L
H
––
L
H
I*
*I = indeterminate. When both A and B outputs are low, the ON/OFF output
remains in the state it was in prior to entering AOUT = BOUT = L.
Using External Strobe
A positive pulse on the strobe input, with the 0SC input tied
to ground, will initiate a comparison cycle. The STROBE
input is edge-sensitive and pulse widths of 50ns will
typically trigger the device.
APPLICATIO S I FOR ATIO
WU
UU
Because of the sampling nature of the LTC1040, some
sensitivity exists between the offset voltage and the falling
edge of the input strobe. When the falling edge of the
strobe signal falls within the comparator’s active time
(80
safterrisingedge),offsetchangesofasmuchas2mV
can occur. To eliminate this problem, make sure the strobe
pulse width is greater than the response time, tD.
Using Internal Strobe
An internal oscillator allows the LTC1040 to strobe itself.
The frequency of oscillation, and hence sampling rate, is
set by an external RC network (see typical curve of
Sampling Rate vs REXT, CEXT).
For self-oscillation, the STROBE pin must be tied to
ground. The external RC network is connected as shown
in Figure 9.
To assure oscillation, REXT must be between 100k and
10M. There is no limit to the size of CEXT.
REXT is very important in determining the power
consumption. The average voltage at the oscillator pin is
approximately V+/2. The power consumed by REXT is then:
PREXT = (V +/2)2/REXT.
LTC1040 AI08
BOUT
AOUT
A + B
ON/OFF
80
s
COMPARATOR A
OUTPUT
COMPARATOR B
OUTPUT
STROBE
D
C
CQ
Q
2
4
3
15
REXT
CEXT
LTC1040 AI09
1
9
18
17
16
10
LTC1040
V+
Figure 9. External RC Connection
Figure 8. LTC1040 Logic Diagram
Table 1. Output Logic Truth Table
Example: REXT = 1M, V + 5V, PREXT = (2.5)2/106 =
6.25 10–6W.
This is about four times the power consumed by the
LTC1040 at V + = 5V and fS = 1 sample/second. Where
power is a premium REXT should be made as large as
possible. Note that the power consumed by REXT is not a
function of fS or CEXT.
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| LTC1040M | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Micropower Comparator |
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