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参数资料
| 型号： | LT1721IS |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | Dual/Quad, 4.5ns, Single Supply 3V/5V Comparators with Rail-to-Rail Outputs |
| 中文描述： | QUAD COMPARATOR, 4500 uV OFFSET-MAX, 7 ns RESPONSE TIME, PDSO16 |
| 封装： | 0.150 INCH, PLASTIC, SO-16 |
| 文件页数： | 12/28页 |
| 文件大小： | 317K |
| 代理商： | LT1721IS |
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12
LT1720/LT1721
Technology’s rail-to-rail amplifiers and other products.
But the output of a comparator is digital, and this output
stage can drive TTL or CMOS directly. It can also drive ECL,
as described earlier, or analog loads as demonstrated in
the applications to follow.
The bias conditions and signal swings in the output stages
are designed to turn their respective output transistors off
faster than on. This nearly eliminates the surge of current
from V
CC
to ground that occurs at transitions, keeping the
power consumption low even with high output-toggle
frequencies.
The low surge current is what keeps the power consump-
tion low at high output-toggle frequencies. The frequency
dependence of the supply current is shown in the Typical
Performance Characteristics. Just 20pF of capacitive load
on the output more than triples the frequency dependent
rise. The slope of the no-load curve is just 32
μ
A/MHz. With
a 5V supply, this current is the equivalent of charging and
discharging just 6.5pF. The slope of the 20pF load curve is
133
μ
A/MHz, an addition of 101
μ
A/MHz, or 20
μ
A/MHz-V,
units that are equivalent to picoFarads.
The LT1720/LT1721 dynamic current can be estimated by
adding the external capacitive loading to an internal equiva-
lent capacitance of 5pF to 15pF, multiplied by the toggle
frequency and the supply voltage. Because the capaci-
tance of routing traces can easily approach these values,
the dynamic current is dominated by the load in most
circuits.
APPLICATIO
S I
N
FOR
ATIO
U
Circuit Description
The block diagram of one comparator in the LT1720/LT1721
is shown in Figure 6. There are differential inputs
(+IN/–IN), an output (OUT), a single positive supply (V
CC
)
and ground (GND). All comparators are completely inde-
pendent, sharing only the power and ground pins. The
circuit topology consists of a differential input stage, a
gain stage with hysteresis and a complementary
common-emitter output stage. All of the internal signal
paths utilize low voltage swings for high speed at low power.
The input stage topology maximizes the input dynamic
range available without requiring the power, complexity
and die area of two complete input stages such as are
found in rail-to-rail input comparators. With a 2.7V supply,
the LT1720/LT1721 still have a respectable 1.6V of input
common mode range. The differential input voltage range
is rail-to-rail, without the large input currents found in
competing devices. The input stage also features phase
reversal protection to prevent false outputs when the
inputs are driven below the –100mV common mode
voltage limit.
The internal hysteresis is implemented by positive, nonlin-
ear feedback around a second gain stage. Until this point,
the signal path has been entirely differential. The signal
path is then split into two drive signals for the upper and
lower output transistors. The output transistors are con-
nected common emitter for rail-to-rail output operation.
The Schottky clamps limit the output voltages at about
300mV from the rail, not quite the 50mV or 15mV of Linear
W
U
–
+
–
+
–
+
–
+
+IN
–IN
A
V1
A
V2
NONLINEAR STAGE
OUT
GND
1720/21 F06
V
CC
+
Σ
+
Σ
Figure 6. LT1720/LT1721 Block Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1721IS#PBF | 功能描述:IC COMP R-RINOUT QUAD 16-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 |
| LT1721IS#TRPBF | 制造商:Linear Technology 功能描述:Comparator Quad R-R O/P 6V 16-Pin SOIC N T/R 制造商:Linear Technology 功能描述:IC COMP R-RINOUT QUAD 16SOIC |
| LT1722 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Single, Dual, Quad 200MHz Low Noise Precision Op Amps |
| LT1722CS5 | 制造商:Linear Technology 功能描述:OP Amp Single GP ±6.3V/12.6V 5-Pin TSOT-23 |
| LT1722CS5#PBF | 制造商:Linear Technology 功能描述:OP Amp Single GP 制造商:Linear Technology 功能描述:SC-Amps/Industrial Cut Tape 2 制造商:Linear Technology 功能描述:SC-Amps/Industrial, Cut Tape 200MHz Low Noise Precision OP Amp |
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