参数资料
型号: LT1394CS8
厂商: Linear Technology
文件页数: 6/16页
文件大小: 0K
描述: IC COMPARATOR LOW PWR 7NS 8-SOIC
标准包装: 100
系列: UltraFast™
类型: 带锁销
元件数: 1
输出类型: CMOS,补充型,TTL
电压 - 输入偏移(最小值): 2.5mV @ ±5V
电流 - 输入偏压(最小值): 4.5µA @ ±5V
电流 - 输出(标准): 20mA
电流 - 静态(最大值): 8.5mA
CMRR, PSRR(标准): 100dB CMRR,100dB PSRR
传输延迟(最大): 9ns
工作温度: -40°C ~ 85°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
安装类型: 表面贴装
包装: 管件
14
LT1394
High Speed Adaptive Trigger Circuit
Line and fibre-optic receivers often require an adaptive
trigger to compensate for variations in signal amplitude
and DC offsets. The circuit in Figure 18 triggers on 2mV to
175mV signals from 100Hz to 45MHz while operating from
a single 5V rail. A1, operating at a gain of 15, provides
wideband AC gain. The output of this stage biases a 2-way
peak detector (Q1 through Q4). The maximum peak is
stored in Q2’s emitter capacitor, while the minimum excur-
sion is retained in Q4’s emitter capacitor. The DC value of
the midpoint of A1’s output signal appears at the junction
of the 500pF capacitor and the 3M
units. This point
always sits midway between the signal’s excursions,
egardless of absolute amplitude. This signal-adaptive volt-
age is buffered by A2 to set the trigger voltage at the
LT1394’s positive input. The LT1394’s negative input is
biased directly from A1’s output. The LT1394’s output, the
circuit’s output, is unaffected by >85:1 signal amplitude
variations. Bandwidth limiting in A1 does not affect trigger-
ing because the adaptive trigger threshold varies
ratiometrically to maintain circuit output.
APPLICATIONS INFORMATION
WU
U
Figure 19 shows operating waveforms at 45MHz. Trace A’s
input produces Trace B’s amplified output at A1. The
comparator’s output is Trace C.
Split supply versions of this circuit can achieve band-
widths to 50MHz with wider input operating range.
A = 0.1V/DIV
B = 0.1V/DIV
C = 5V/DIV
50ns/DIV
AN72 F64
Figure 19. Adaptive Trigger Responding to a 40MHz,
5mV Input. Input Amplitude Variations from 2mV to
175mV Are Accommodated
5V
+
A1
LT1227
+
A2
LT1006
INPUT
5V
TRIGGER
OUT
1394 F18
500pF
0.1
F
510
470
470
750
36
1
3
2
4
14
13
15
5
6
12
10
11
2k
10
F
2k
+
0.1
F
0.1
F
0.005
F
0.005
F
100
F
+
Q1, Q2, Q3, Q4 = CA3096 ARRAY:
TIE SUBSTRATE (PIN 16) TO GROUND
= 1N4148
+
LT1394
Q1
Q2
Q3
Q4
3M
Figure 18. 45MHz Single Supply Adaptive Trigger. Output Comparator’s
Threshold Varies Ratiometrically with Input Amplitude, Maintaining Data
Integrity over > 85:1 Input Amplitude Range
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相关代理商/技术参数
参数描述
LT1394CS8#PBF 功能描述:IC COMPARATOR LOW PWR 7NS 8-SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 比较器 系列:UltraFast™ 标准包装:1 系列:- 类型:通用 元件数:1 输出类型:CMOS,开路集电极,TTL 电压 - 电源,单路/双路(±):2.7 V ~ 5.5 V 电压 - 输入偏移(最小值):7mV @ 5V 电流 - 输入偏压(最小值):0.25µA @ 5V 电流 - 输出(标准):84mA @ 5V 电流 - 静态(最大值):120µA CMRR, PSRR(标准):- 传输延迟(最大):600ns 磁滞:- 工作温度:-40°C ~ 85°C 封装/外壳:SC-74A,SOT-753 安装类型:表面贴装 包装:剪切带 (CT) 产品目录页面:1268 (CN2011-ZH PDF) 其它名称:*LMV331M5*LMV331M5/NOPBLMV331M5CT
LT1394CS8#PBF 制造商:Linear Technology 功能描述:High Speed Comparator IC
LT1394CS8#TR 功能描述:IC COMPARATOR 7NS LOW PWR 8SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 比较器 系列:UltraFast™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:通用 元件数:1 输出类型:CMOS,推挽式,满摆幅,TTL 电压 - 电源,单路/双路(±):2.5 V ~ 5.5 V,±1.25 V ~ 2.75 V 电压 - 输入偏移(最小值):5mV @ 5.5V 电流 - 输入偏压(最小值):1pA @ 5.5V 电流 - 输出(标准):- 电流 - 静态(最大值):24µA CMRR, PSRR(标准):80dB CMRR,80dB PSRR 传输延迟(最大):450ns 磁滞:±3mV 工作温度:-40°C ~ 85°C 封装/外壳:6-WFBGA,CSPBGA 安装类型:表面贴装 包装:管件 其它名称:Q3554586
LT1394CS8#TRPBF 功能描述:IC COMPARATOR LOW PWR 7NS 8-SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 比较器 系列:UltraFast™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:通用 元件数:1 输出类型:CMOS,推挽式,满摆幅,TTL 电压 - 电源,单路/双路(±):2.5 V ~ 5.5 V,±1.25 V ~ 2.75 V 电压 - 输入偏移(最小值):5mV @ 5.5V 电流 - 输入偏压(最小值):1pA @ 5.5V 电流 - 输出(标准):- 电流 - 静态(最大值):24µA CMRR, PSRR(标准):80dB CMRR,80dB PSRR 传输延迟(最大):450ns 磁滞:±3mV 工作温度:-40°C ~ 85°C 封装/外壳:6-WFBGA,CSPBGA 安装类型:表面贴装 包装:管件 其它名称:Q3554586
LT1394CS8PBF 制造商:Linear Technology 功能描述:Ground-Sensing Comparator 7ns SOIC8