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PDF LMH7220 Data sheet ( Hoja de datos )
| Número de pieza | LMH7220 | |
| Descripción | High Speed Comparator with LVDS Output | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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www.DataSheet4U.com
September 2006
LMH7220
High Speed Comparator with LVDS Output
General Description
The LMH7220 is a high speed, low power comparator with
an operating supply voltage range of 2.7V to 12V. The
LMH7220 has a differential, LVDS output, driving 325 mV
into a 100Ω symmetrical transmission line. The LMH7220
has a 2.9 ns propagation delay and 0.6 ns rise and fall times
while the supply current is only 6.8 mA at 5V (load current
excluded).
The LMH7220 inputs have a voltage range that extends 200
mV below ground, allowing ground sensing applications. The
LMH7220 is available in the 6-Pin TSOT package. ThIs
package is ideal where space is a critical item.
Features
(VS = 5V TA = 25˚C, Typical values unless otherwise speci-
fied)
n Propagation delay @ 100 mV overdrive
2.9 ns
n Rise and fall times
0.6 ns
n Supply voltage
2.7V to 12V
n Supply current
6.8 mA
n Temperature range
−40˚C to 125˚C
n LVDS output
Applications
n Acquisition trigger
n Fast differential line receiver
n Pulse height analyzer
n Peak detector
n Pulse width modulator
n Remote threshold detection
n Oscilloscope triggering
Typical Schematic
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20137603
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© 2006 National Semiconductor Corporation
DS201376
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1 page  
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+2.7V DC Electrical Characteristics (Continued)
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, VCM = 300 mV, −50 mV < VID < +50 mV and RL = 100Ω.
Boldface limits apply at the temperature extremes. (Note 6)
Symbol
Parameter
Conditions
VOH
VOL
VOD
∆VOD
ISC
IS
Output Voltage High
Average of ‘0’ to ‘1’
Output Voltage Low
Average of ‘0’ to ‘1’
Output Voltage Differential
VOD Change between ‘0’ to ‘1’
Short Circuit Current Output to
GND Pin (Note 4)
Output Shorted Together (Note 4)
Supply Current
VIN Differential = 50 mV
VIN Differential = 50 mV
VIN Differential = 50 mV
VIN Differential = ±50 mV
OUT Q to GND Pin
VIN Differential = 50 mV
OUT Q to GND Pin
VIN Differential = 50 mV
OUT Q to OUT Q
VIN Differential = 50 mV
Load Current Excluded
VIN Differential = 50 mV
Min
(Note 6)
Typ
(Note 5)
1370
Max
(Note 6)
1475
Units
mV
925 1060
mV
250 315 400 mV
−25 +25 mV
5
5
mA
5
6.6 9
mA
12.6
+2.7V AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for TJ = 25˚C, VCM = 300 mV, −50 mV < VID < +50 mV and RL = 100Ω.
Boldface limits apply at the temperature extremes. (Note 6)
Symbol
Parameter
et4U.com TR
Toggle Rate
tPDLH
tOD-disp
Propagation Delay
tPDLH = (tPDH + tPDL ) / 2
(see figure 3 application note)
Input SR = Constant
VID start value = -100mV
Input Overdrive Dispersion
Conditions
Overdrive = ±50 mV; CL = 2 pF @
50% Output Swing
Overdrive 2D0amtaVSheet4U.com
Overdrive 50 mV
Overdrive 100 mV
Overdrive 1V
@Overdrive 20 - 100 mV
@Overdrive 100 mV - 1V
Min
(Note 6)
700
Typ
(Note 5)
880
3.80
3.29
3.0
2.60
0.83
0.37
Max
(Note 6)
7
Units
Mb/s
ns
ns
tSR-disp Input Slew Rate Dispersion
0.05 V/ns to 1 V/ns
Overdrive 100 mV
0.23
ns
tCM-disp Input Common Mode dispersion
∆tPDLH
∆tPDHL
tr
Q to Q Time Skew
| tPDH - tPDL | (Note 8)
Q to Q Time Skew
| tPDL - tPDH | (Note 8)
Output Rise Time (20% - 80%)
(Note 9)
SR = 4 V/ns; Overdrive 100 mV
VCM = 0 to 1.5V
Overdrive = 100 mV; CL = 2 pF
Overdrive = 100 mV; CL = 2 pF
Overdrive = 100 mV; CL = 2 pF
0.16
0.09
0.09
0.64
ns
ns
ns
ns
tf
Output Fall Time (20% - 80%)
Overdrive = 100 mV; CL = 2 pF
(Note 9)
0.59
ns
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Application Information (Continued)
DEFINITIONS
For a good understanding of many parameters of the
LMH7220 it is necessary to perform a lot of measurements.
All of those parameters are listed in the data tables in the first
part of the datasheet. There are different tables for several
supply voltages containing a separate set of data per supply
voltage. In the table below is a list of abbreviations of the
measured parameters and a short description of the condi-
tions which are applied for measuring them . Following this
table several parameters are highlighted to explain more
clearly what it means exactly and what effects such a phe-
nomena can have for any applied electronic circuit.
Symbol
IB
IOS
TC IOS
VOS
TC VOS
CMRR
VRI
PSRR
VO
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∆VO
VOH
VOL
VODH
VODL
VOD
∆VOD
Hyst
ISQG, ISQG
ISQQ
TR
PW
tPDH resp tPDL
tPDL resp tPDH
DataSheet4U.com
Text
Input Bias Current
Input Offset Current
Average Input Offset Current Drift
Input Offset Voltage
Average Input Offset Voltage Drift
Common Mode Rejection Ratio
Input Voltage Range
Power Supply Rejection Ratio
Output Offset Voltage
Change in Output Offset Voltage
Output Voltage High
Output Voltage Low
Output Differential Voltage logic ‘1’
Output Differential Voltage logic ‘0’
Average of VODH and VODL
Change in VOD between ‘0’ and ‘1’
Hysteresis
Short Circuit Current one output to
GND
Short Circuit Current outputs
together
Maximum Toggle Rate
Pulse Width
Propagation Delay
Description
Current flowing in or out the input pins, when both biased at 0.3
Volt above GND
Difference between the positive- and the negative input currents
needed to make the outputs change state, averaged for H to L and
L to H transitions
Temperature Coefficient of IOS
Voltage difference needed between IN+ and IN− to make the
outputs change state, averaged for H to L and L to H transitions
Temperature Coefficient of VOS
Ratio of input offset voltage change and input common mode
voltage change
Upper and lower limits of the input voltage are defined as where
CMRR drops below 50 dB.
Ratio of input offset voltage change and supply voltage change
from VS-MIN to VS-MAX
Output Common Mode Voltage averaged for logic ‘0’ and logic ‘1’
levels (See Figure 12)
Difference in Output Common Mode Voltage between logic ‘0’ and
logic ‘1’ levels (See Figure 13)
High state single ended output voltage (Q or Q) (See Figure 12)
DLoawtasStahteeesti4ngUle.ceonmded output voltage (Q or Q) (See Figure 12)
VOH(Q) – VOL(Q) (logic level ‘1’) (See Figure 13)
VOH(Q) – VOL(Q) (logic level ‘0’) (See Figure 13)
(VODH + VODL) / 2
|VODH – VODL| (See Figure 13)
Difference in input switching levels for L to H and H to L
transitions. (See Figure 11)
Current that flows from one output to GND if shorted single ended
Current flowing between output Q and output Q if shorted
differentially
Maximum frequency at which the outputs can toggle before VOD
drops under 50% of the nominal value.
Time from 50% of the rising edge of a signal to 50% of the falling
edge
Delay time between the moment the input signal crosses the
switching level L to H and the moment the output signal crosses
50% of the rising edge of Q output (tPDH), or delay time between
the moment the input signal crosses the switching level H to L and
the moment the output signal crosses 50% of the falling edge of Q
output (tPDL)
Delay time between the moment the input signal crosses the
switching level L to H and the moment the output signal crosses
50% of the falling edge of Q output (tPDL), or delay time between
the moment the input signal crosses the switching level H to L and
the moment the output signal crosses 50% of the rising edge of Q
output (tPDH)
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| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet LMH7220.PDF ] | |
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