參數(shù)資料
型號: LT1713CMS8
廠商: Linear Technology
文件頁數(shù): 8/16頁
文件大小: 0K
描述: IC COMP R-R I/O SINGLE LP 8MSOP
標準包裝: 50
系列: UltraFast™
類型: 帶鎖銷
元件數(shù): 1
輸出類型: CMOS,補充型,滿擺幅,TTL
電壓 - 電源,單路/雙路(±): 2.4 V ~ 12 V,±2.4 V ~ 6 V
電壓 - 輸入偏移(最小值): 4mV @ 5V
電流 - 輸入偏壓(最小值): 2µA @ 5V
電流 - 輸出(標準): 20mA
電流 - 靜態(tài)(最大值): 7.5mA
CMRR, PSRR(標準): 70dB CMRR,80dB PSRR
傳輸延遲(最大): 11ns
磁滯: 100mV
工作溫度: -40°C ~ 85°C
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
安裝類型: 表面貼裝
包裝: 管件
16
LT1713/LT1714
LINEAR TECHNOLOGY CORPORATION 2000
171314f LT/TP 0501 4K PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX:(408)434-0507 q www.linear-tech.com
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1016
UltraFast Precision Comparator
Industry Standard 10ns Comparator
LT1116
12ns Single Supply Ground Sensing Comparator
Single Supply Version of the LT1016
LT1394
7ns, UltraFast Single Supply Comparator
6mA Single Supply Comparator
LT1671
60ns, Low Power, Single Supply Comparator
450
A Single Supply Comparator
LT1711/LT1712
Single/Dual, 4.5ns, 3V/5V/
±5V Rail-to-Rail Comparators Faster Versions of LT1713/LT1714
LT1719
4.5ns, Single Supply 3V/5V Comparator
4mA Comparator with Rail-to-Rail Outputs
LT1720/LT1721
Dual/Quad, 4.5ns, Single Supply Comparator
Dual/Quad Version of the LT1719
forte of this particular implementation is that it is rail-to-
rail allowing a full-scale analog input. Once the triangle
wave is achieved, the remainder of the pulse width modu-
lator is easy, and is constituted by doing a simple compari-
son using the second half of the LT1714. The triangle wave
and the relatively slow moving analog signal (the one to be
modulated or to do the modulation, depending on how you
look at it) are fed into the inputs of comparator B, whose
output is then the PWM representation of the analog input
voltage. The higher the analog input voltage, the wider the
output pulse. The time averaged output level is thus
proportional to the analog input voltage. This binary
output can then be fed into power transistors with direct
control over motor or speaker winding current, for
U
TYPICAL APPLICATIO
+
A
1/2 LT1714
2
1
+
2
V+
3
15
16
C2
0.01
F
R6
1k
V+ = 2.7V TO 7V
1MHz
TRIANGLE
WAVE
R5
1k
13
6
1
4
7
14
4
V+
R1
26.1
R4
499
21
1k
10k
1k
C1
500pF
R2
2k
R3
2k
+
B
1/2 LT1714
7
8
6
9
10
171314 F09
12
11
5
V+
C3
100pF
LT1809
C4
0.001
F
C5
0.01
F
C6
0.001
F
ANALOG
INPUT
ANTIALIASING
FILTER
16kHz ANALOG FILTER
FOR LINEARITY MEASUREMENT
COMPLEMENTARY
1MHz PWM
OUTPUTS
Figure 9. Rail-to-Rail 1MHz Pulse Width Modulator
example, with their inherent lowpass characteristic. Care
must be taken to avoid cross conduction in the output
power transistors.
The linearity of the pulse width modulated signal can easily
be ascertained by putting a simple 2-pole RC filter at the
output (as shown in Figure 9). This demodulates the signal
which can then be viewed and compared with the original
input signal on an oscilloscope. Using a spectrum analyzer
and a 1kHz reference signal, this circuit’s distortion prod-
ucts were measured as better than – 50dBc (0.3%) to
about 3.5VP-P, degrading to – 30dBc (3%) as the circuit
clips at 5VP-P on a single 5V supply.
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