TP1946-VR [3PEAK]
1.8V Micropower, RRIO, Open-Drain Output Comparators;型号: | TP1946-VR |
厂家: | 3PEAK |
描述: | 1.8V Micropower, RRIO, Open-Drain Output Comparators |
文件: | 总20页 (文件大小:655K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
TP1945 / TP1946 / TP1948
3PEAK
1.8V Micropower, RRIO, Open-Drain Output Comparators
Features
Description
The 3PEAK TP194x single/dual/quad micropower
comparators feature rail-to-rail inputs and outputs,
and fully specified single-supply operation down to
+1.8V. The devices draw only 49μA per comparator
while reaching 70ns high-to-low response time, and
have open-drain outputs that can be pulled beyond
V– to 6V (max) above ground for maximum flexibility.
Down to 1.8V Supply Voltage: 1.8V to 5.5V
Low Supply Current: 49 μA per Channel
High-to-Low Propagation Delay: 70 ns
Offset Voltage: ± 3.0 mV Maximum
Offset Voltage Temperature Drift: 0.3 μV/°C
In addition, their rail-to-rail input common-mode
voltage range makes these comparators suitable for
ultra-low-voltage operation. The input common-
mode voltage range extends 200mV below ground
and 200mV above supply, allowing both ground and
supply sensing. The internal input hysteresis
eliminates output switching due to internal input
noise voltage, reducing current draw.
Input Bias Current: 6 pA Typical
Input Common-Mode Range Extends 200 mV
Internal Hysteresis Ensures Clean Switching
No Phase Reversal for Overdriven Inputs
Open-Drain Output for Maximum Flexibility
Green, Space-Saving SC70 Package Available
A +1.8V to +5.5V single-supply operating voltage
range makes the TP194x family of comparators
ideal for 2-cell battery-powered applications.
Applications
The TP1945 single comparator is available in tiny
SC70 package for space-conservative designs. All
chips are specified for the temperature range of
–40°C to +85°C.
Threshold Detectors/Discriminators
Sensing at Ground or Supply Line
Peak and Zero-crossing Detectors
Logic Level Shifting or Translation
Window Comparators
3PEAK and the 3PEAK logo are registered trademarks of
3PEAK INCORPORATED. All other trademarks are the property
of their respective owners.
IR Receivers
Clock and Data Signal Restoration
Telecom, Portable Communications
Portable and Battery Powered Systems
Related Products
DEVICE
DESCRIPTION
Fast 30ns, Low Power, Internal Hysteresis,
± 3mV Maximum VOS, – 0.2V to VDD + 0.2V RRI,
Push-Pull (CMOS/TTL) Output Comparators
TP1951/TP1951N
/TP1952/TP1954
VDD
VPU
R3
TP194x
Fast 30ns, Low Power, Internal Hysteresis,
± 3mV Maximum VOS, – 0.2V to VDD + 0.2V RRI,
Open-Drain Output Comparators
TP1955/TP1955N
/TP1956/TP1958
R1
RPU
Fast 68ns, 46µ A Micropower, Internal Hysteresis,
± 3mV Maximum VOS, – 0.2V to VDD + 0.2V RRI,
Push-Pull (CMOS/TTL) Output Comparators
TP1941/TP1941N
/TP1942/TP1944
VOUT
VIN
TP1931
/TP1932/TP1934
950ns, 3µ A, 1.8V, ± 2.5mV VOS-MAX, Internal
Hysteresis, RRI, Push-Pull Output Comparators
R2
TP1935
/TP1936/TP1938
950ns, 3µ A, 1.8V, ± 2.5mV VOS-MAX, Internal
Hysteresis, RRI, Open-Drain Comparators
Typical Application of the TP194x Comparators
Ultra-low 200nA, 13µ s, 1.6V, ± 2mV VOS-MAX,
Internal Hysteresis, RRI, Push-Pull (CMOS/TTL)
Output Comparators
TP2011
/TP2012/TP2014
Ultra-low 200nA, 13µ s, 1.6V, ± 2mV VOS-MAX
Internal Hysteresis, RRI, Open-Drain Output
Comparators
,
TP2015
/TP2016/TP2018
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TP1945 / TP1946 / TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Pin Configuration (Top View)
TP1945
5-Pin SOT23/SC70
TP1945U
5-Pin SOT23/SC70
TP1946
8-Pin SOT23/SOIC/MSOP
TP1948
14-Pin SOIC/TSSOP
(-T, -S and -V Suffixes)
(-S and -T Suffixes)
(-T and -C Suffixes)
(-T and -C Suffixes)
1
5
4
1
2
3
5
1
2
3
4
8
7
6
5
1
2
3
4
5
6
7
14 Out D
Out
V-
V+
-In
+In
V-
V+
V+
Out A
﹣In A
﹢In A
V+
Out A
﹣In A
﹢In A
V-
﹣In D
﹢In D
2
3
13
12
11
10
9
Out B
A
A
B
D
C
+In
-In
4
Out
﹣In B
﹢In B
B
V-
﹢In C
﹢In B
﹣In B
Out B
TP1945
8-Pin SOIC
(-S Suffix)
﹣In C
TP1945U2
5-Pin SOT23
(-T Suffix)
8
Out C
1
2
3
4
8
7
6
5
NC
NC
﹣In
1
2
3
5
4
V+
Out
V+
V-
Out
NC
﹢In
+In
-In
V-
Order Information
Marking
Information
Model Name
Order Number
Package
Transport Media, Quantity
TP1945-TR
TP1945-CR
TP1945-SR
TP1945U-TR
TP1945U-CR
TP1945U2-TR
TP1946-TR
TP1946-SR
TP1946-VR
TP1948-SR
TP1948-TR
5-Pin SOT23
5-Pin SC70
8-Pin SOIC
5-Pin SOT23
5-Pin SC70
5-Pin SOT23
8-Pin SOT23
8-Pin SOIC
8-Pin MSOP
14-Pin SOIC
14-Pin TSSOP
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 4000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 3000
Tape and Reel, 4000
Tape and Reel, 3000
Tape and Reel, 2500
Tape and Reel, 3000
CT4YW (1)
CC4YW (1)
1945S
CA4YW (1)
CB4YW (1)
CE4YW (1)
C46YW (1)
C46S
TP1945
TP1945U
TP1945U2
TP1946
TP1948
C46V
1948S
1948T
Note (1): ‘YW’ is date coding scheme. 'Y' stands for calendar year, and 'W' stands for single workweek coding scheme.
Pin Functions
–IN: Inverting Input of the Comparator. Voltage
range of this pin can go from V– – 0.3V to V+ + 0.3V.
between power supply pins or between supply pins
and ground.
+IN: Non-Inverting Input of Comparator. This pin has
the same voltage range as –IN.
V– (VSS): Negative Power Supply. It is normally tied to
ground. It can also be tied to a voltage other than
ground as long as the voltage between V+ and V– is
from 1.8V to 5.5V. If it is not connected to ground,
bypass it with a capacitor of 0.1μF as close to the
part as possible.
NC: No Connection.
V+ (VDD): Positive Power Supply. Typically the
voltage is from 1.8V to 5.5V. Split supplies are
possible as long as the voltage between V+ and V–
is between 1.8V and 5.5V. A bypass capacitor of
0.1μF as close to the part as possible should be used
OUT: Comparator Output. The voltage range
extends to within millivolts of each supply rail.
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TP1945/TP1946/TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Note 1
Absolute Maximum Ratings
Supply Voltage: V+ – V–....................................6.0V
Open-Drain Output................................... V– + 6.0V
Input Voltage............................. V– – 0.3 to V+ + 0.3
Difference Input Voltage.............V– – 0.3 to V+ + 0.3
Input Current: +IN, –IN, Note 2..........................±10mA
Output Short-Circuit Current........................ ±45mA
Output Short-Circuit Duration Note 3…......... Indefinite
Current at Output and Supply Pins............... ±50mA
Operating Temperature Range.........–40°C to 85°C
Maximum Junction Temperature................... 150°C
Storage Temperature Range.......... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ......... 260°C
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any
Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
Note 2: The inputs are protected by ESD protection diodes to each power supply. If the input extends more than 500mV beyond the power
supply, the input current should be limited to less than 10mA.
Note 3: A heat sink may be required to keep the junction temperature below the absolute maximum. This depends on the power supply voltage
and how many amplifiers are shorted. Thermal resistance varies with the amount of PC board metal connected to the package. The specified
values are for short traces connected to the leads.
ESD, Electrostatic Discharge Protection
Symbol
HBM
Parameter
Human Body Model ESD
Charged Device Model ESD
Condition
Minimum Level
Unit
kV
kV
MIL-STD-883H Method 3015.8
JEDEC-EIA/JESD22-C101E
8
2
CDM
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TP1945 / TP1946 / TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Electrical Characteristics
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 27° C.
VDD = +1.8V to +5.5V, VIN+ = VDD, VIN- = 1.2V, RPU=10kΩ, CL =15pF.
SYMBOL PARAMETER
CONDITIONS
MIN
1.8
TYP
MAX
5.5
UNITS
V
VDD
VOS
Supply Voltage
●
Input Offset Voltage Note 1
VCM = 1.2V
●
●
-3.0
± 0.6
+3.0
mV
VOS TC
VHYST
VHYST TC
IB
Input Offset Voltage Drift Note 1
Input Hysteresis Voltage Note 1
Input Hysteresis Voltage Drift Note 1
Input Bias Current
VCM = 1.2V
VCM = 1.2V
VCM = 1.2V
VCM = 1.2V
0.3
μV/° C
mV
μV/° C
pA
4
6
20
6
8
●
IOS
Input Offset Current
4
pA
RIN
Input Resistance
> 100
2
4
GΩ
Differential
Common Mode
VCM = VSS to VDD
CIN
Input Capacitance
pF
dB
V
CMRR
VCM
Common Mode Rejection Ratio
Common-mode Input Voltage
Range
Power Supply Rejection Ratio
Low-Level Output Voltage
High Level Output Current leakage
Output Short-Circuit Current
Quiescent Current per Comparator
●
●
50
70
V– - 0.2
60
V+ + 0.2
PSRR
VOL
IOH_leak
ISC
●
●
75
dB
V
nA
mA
μA
IOUT=1mA
V– + 0.3
0.2
Sink or source current
25
49
IQ
60
tF
Falling Time Note 2
5
ns
ns
Propagation Delay (High-to-Low)
tPD-
Input Overdrive=100mV, VIN- = VSS
70
Note 1: The input offset voltage is the average of the input-referred trip points. The input hysteresis is the difference between the input-referred
trip points.
Note 2: Rising time tR and low-to-high propagation delay tPD+ dependent on the pull-up resistor RL and load capacitor CL.
Typical Performance Characteristics
Input Offset Voltage V.S. Temperature
Input Hysteresis Voltage V.S. Temperature
2.0
10.0
8.0
5V
1.0
0.0
1.8V
6.0
5V
4.0
1.8V
-1.0
-2.0
2.0
VCM=1.2V
VCM=1.2V
0.0
-50
0
50
100
-50
0
50
100
Temperature (℃)
Temperature (℃)
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TP1945/TP1946/TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Typical Performance Characteristics
Quiescent Current V.S. Temperature
Propagation Delay V.S. Temperature
70
100
60
50
40
30
20
5V
tpd- @VDD=5V
80
60
40
20
1.8V
tpd- @VDD=1.8V
VCM=1.2V
-50
VCM=VSS
0
50
100
-50
0
50
100
Temperature (℃)
Temperature (℃)
Propagation Delay V.S. Overdrive Voltage
Propagation Delay V.S. Capacitor Loading
10000
400
VCM=VSS
350
300
250
tpd+ @VDD=5V
1000
tpd- @VDD=5V
tpd- @VDD=1.8V
200
150
100
50
100
tpd- @VDD=1.8V
VCM=VSS
10
0
1
10
100
1V
1
10
100
1n
Overdrive (mV)
Capacitive Load (pF)
Quiescent Current V.S. Common mode Voltage
Quiescent Current V.S. Common mode Voltage
100
100
80
80
27℃ 85℃
85℃
27℃
60
60
40
20
0
40
VDD=5V
VDD=5V
Vin-=0V
Vin+=Vcm
-40℃
-40℃
20
Vin-=0V
Vin+=Vcm
0
0
1
2
3
4
5
0.0
0.5
1.0
1.5
2.0
Common Mode Voltage (V)
Common Mode Voltage (V)
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TP1945 / TP1946 / TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Typical Performance Characteristics
Input Offset Voltage V.S. Common mode Voltage
Input Offset Voltage V.S. Common mode Voltage
2
2
-40℃
1
1
0
85℃
27℃
27℃
85℃
0
-1
-2
-40℃
-1
VDD=5V
VDD=1.8V
-2
0
1
2
3
4
5
0.0
0.5
1.0
1.5
2.0
Common Mode Voltage (V)
Common Mode Voltage (V)
Input Hysteresis Voltage V.S. Common mode Voltage
Input Hysteresis Voltage V.S. Common mode Voltage
10
20
16
85℃
8
27℃
6
12
85℃
27℃
4
8
-40℃
2
4
-40℃
VDD=5V
0
VDD=1.8V
0
0
1
2
3
4
5
0.0
0.5
1.0
1.5
2.0
Common Mode Voltage (V)
Common Mode Voltage (V)
Input Offset Voltage Distribution
Input Hysteresis Voltage Distribution
45%
40%
35%
30%
25%
20%
15%
10%
5%
90%
1626 Samples
VCM=1.2V
1626 Samples
VCM=1.2V
80%
70%
60%
50%
40%
30%
20%
10%
0%
100mV overdrive
100mV overdrive
5V
1.8V
5V
1.8V
0%
-6 -5 -4 -3 -2 -1
0
1
2
3
4
5
6
0
1
2
3
4
5
6
7
8
9
10 11 12
Input Offset Voltage (mV)
Input Hysteresis Voltage (mV)
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TP1945/TP1946/TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Typical Performance Characteristics
Quiescent Current Distribution
Input Bias and Offset Current V.S. Temperature
1000
70%
60%
50%
40%
30%
20%
10%
0%
1626 Samples
VCM=1.2V
100mV overdrive
100
10
1
Ibias
1.8V
5V
Ios
VDD=5V
20 25 30 35 40 45 50 55 60 65 70 75 80
Quiscent Current (uA)
-50
0
50
100
TEMPERATURE (℃)
Input Bias&Offset Current V.S. Common mode Voltage
Output Short Circuit Current V.S. Temperature
20
40
Isource@5V
15
20
Isource@1.8V
Ibias
10
0
Isink@1.8V
Ios
-20
5
VDD=5V
0
Isink@5V
60
-40
0
1
2
3
4
-40
-15
10
35
85
Common Mode Voltage (V)
TEMPERATURE (℃)
Output Short Circuit Current V.S. Supply Voltage
Output Voltage Headroom V.S. Output Current
1.0
40
Isource
0.8
85℃
20
27℃
0.6
-40℃
0
-40℃ 27℃
85℃
0.4
-20
-40
0.2
Isink
VDD=5V
0.0
1
2
3
4
5
0
2
4
6
8
10
Supply Voltage (V)
Output Current (mA)
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TP1945 / TP1946 / TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Typical Performance Characteristics
Output Voltage Headroom V.S. Output Current
Input Offset Voltage V.S. Supply Voltage
2
1.0
1
0.8
85℃
27℃
85℃
0.6
0
27℃
-40℃
-40℃
0.4
-1
0.2
VDD=1.8V
0.0
-2
1
2
3
4
5
0
1
2
3
4
5
Supply Voltage (V)
Output Current (mA)
Input Hysteresis Voltage V.S. Supply Voltage
Quiescent Current V.S. Supply Voltage
10
70
85℃
85℃
8
60
27℃
27℃
6
50
- 4 ℃0
4
40
-40℃
2
30
20
0
1
2
3
4
5
1
2
3
4
5
Supply Voltage (V)
S u p p l y V o l t a
High to low Propagation Delay V.S. Supply Voltage
Output Leakage Current V.S. Pull-up Voltage
1000
100
27℃
80
60
40
20
-40℃
100
85℃
10
85℃
27℃
VCM=VSS
VDD=5V
1
1
2
3
4
5
1
2
3
4
5
Supply Voltage (V)
Pull-up Voltage (V)
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TP1945/TP1946/TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Operation
The TP194x family single-supply comparators feature
internal hysteresis, high speed, and low power. Input
signal range extends beyond the negative and
positive power supplies. The output can even extend
all the way to the negative supply. The input stage is
active over different ranges of common mode input
voltage. Rail-to-rail input voltage range and
low-voltage single-supply operation make these
devices ideal for portable equipment.
Applications Information
Inputs
The TP194x comparator family uses CMOS transistors at the input which prevent phase inversion when the input pins
exceed the supply voltages. Figure 1 shows an input voltage exceeding both supplies with no resulting phase
inversion.
6
Input Voltage
4
2
0
Output Voltage
VDD=5V
-2
Time (100μs/div)
Figure 1. Comparator Response to Input Voltage
The electrostatic discharge (ESD) protection input structure of two back-to-back diodes and 1kΩ series resistors are
used to limit the differential input voltage applied to the precision input of the comparator by clamping input voltages
that exceed supply voltages, as shown in Figure 2. Large differential voltages exceeding the supply voltage should be
avoided to prevent damage to the input stage.
1 kΩ
+In
Core
1 kΩ
-In
Chip
Figure 2. Equivalent Input Structure
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TP1945 / TP1946 / TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Internal Hysteresis
Most high-speed comparators oscillate in the linear region because of noise or undesired parasitic feedback. This
tends to occur when the voltage on one input is at or equal to the voltage on the other input. To counter the parasitic
effects and noise, the TP194x implements internal hysteresis.
The hysteresis in a comparator creates two trip points: one for the rising input voltage and one for the falling input
voltage. The difference between the trip points is the hysteresis. When the comparator’s input voltages are equal, the
hysteresis effectively causes one comparator input voltage to move quickly past the other, thus taking the input out of
the region where oscillation occurs. Figure 3 illustrates the case where IN- is fixed and IN+ is varied. If the inputs were
reversed, the figure would look the same, except the output would be inverted.
Vi
Vtr
Vi
Vtr
Vhyst=Vtr-Vtf
Vtr+V
Vhyst=Vtr-Vtf
Vtr+V
Hysteresis
Band
Hysteresis
Band
Vin-
Vin-
tf -Vin-
tf -Vin-
Vos=
2
Vos=
2
Vtf
Vtf
Time
Time
VDD
VDD
0
0
Non-Inverting Comparator Output
Inverting Comparator Output
Figure 3. Comparator’s hysteresis and offset
External Hysteresis
Greater flexibility in selecting hysteresis is achieved by using external resistors. Hysteresis reduces output chattering
when one input is slowly moving past the other. It also helps in systems where it is best not to cycle between high and
low states too frequently (e.g., air conditioner thermostatic control). Output chatter also increases the dynamic supply
current.
Non-Inverting Comparator with Hysteresis
A non-inverting comparator with hysteresis requires a two-resistor network, as shown in Figure 4 and a voltage
reference (Vr) at the inverting input.
VPU
VPU
VPU
R2
R2
R2
TP1945
TP1946
TP1948
TP1945
TP1946
TP1948
TP1945
TP1946
TP1948
RPU
Vo
RPU
Vo
RPU
Vo
R1
Vr
R1
Vr
R1
Vr
Vi
Vtr
Vtf
V+=Vr
V+=Vr
Figure 4. Non-Inverting Configuration with Hysteresis
When Vi is low, the output is also low. For the output to switch from low to high, Vi must rise up to Vtr. When Vi is high,
the output is also high. In order for the comparator to switch back to a low state, Vi must equal Vtf before the
non-inverting input V+ is again equal to Vr.
R
2
V
V
tr
r
R
R
2
1
R
1
V
(V
DD
V
tf
)
V
tf
r
R
PU
R
R
1
2
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TP1945/TP1946/TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
R
1
R
2
V
V
r
tr
R
2
R
R
R
R
1
1
2
PU
V
V
V
r
DD
tf
R
R
R
R
2
PU
2
PU
R
1
V
V
if RPU<<R2
DD
hyst
R
R
2
PU
Inverting Comparator with Hysteresis
The inverting comparator with hysteresis requires a three-resistor network that is referenced to the comparator supply
voltage (VDD), as shown in Figure 5.
VDD
VPU
VDD
VPU
VDD
VPU
R3
R3
R3
R1
R1
R1
TP1945
TP1946
TP1948
TP1945
TP1946
TP1948
TP1945
TP1946
TP1948
RPU
Vo
RPU
Vo
RPU
Vo
V+=Vtr
V+=Vtf
Vi
Vtr
Vtf
R2
R2
R2
Figure 5. Inverting Configuration with Hysteresis
When Vi is greater than V+, the output voltage is low. In this case, the three network resistors can be presented as
paralleled resistor R2 || R3 in series with R1. When Vi at the inverting input is less than V+, the output voltage is high.
The three network resistors can be represented as R1 ||R3 in series with R2.
R
R
2
V
V
DD
tr
||
R
2
R
1
3
||
R
R
3
2
V
V
DD
tf
||
R
1
R
R
2
3
||
R
R
2
1
V
V V
tf
V
tr
DD
hyst
||
R
3
R
R
1
2
Low Input Bias Current
The TP194x family is a CMOS comparator family and features very low input bias current in pA range. The low input
bias current allows the comparators to be used in applications with high resistance sources. Care must be taken to
minimize PCB Surface Leakage. See below section on “PCB Surface Leakage” for more details.
PCB Surface Leakage
In applications where low input bias current is critical, Printed Circuit Board (PCB) surface leakage effects need to be
considered. Surface leakage is caused by humidity, dust or other contamination on the board. Under low humidity
conditions, a typical resistance between nearby traces is 1012Ω. A 5V difference would cause 5pA of current to flow,
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TP1945 / TP1946 / TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
which is greater than the TP194x’s input bias current at +27°C (±6pA, typical). It is recommended to use multi-layer
PCB layout and route the comparator’s -IN and +IN signal under the PCB surface.
The effective way to reduce surface leakage is to use a guard ring around sensitive pins (or traces). The guard ring is
biased at the same voltage as the sensitive pin. An example of this type of layout is shown in Figure 6 for Inverting
configuration application.
1. For Non-Inverting Configuration:
a) Connect the non-inverting pin (VIN+) to the input with a wire that does not touch the PCB surface.
b) Connect the guard ring to the inverting input pin (VIN–). This biases the guard ring to the same reference as the
comparator.
2. For Inverting Configuration:
a) Connect the guard ring to the non-inverting input pin (VIN+). This biases the guard ring to the same reference voltage as
the comparator (e.g., VDD/2 or ground).
b) Connect the inverting pin (VIN–) to the input with a wire that does not touch the PCB surface.
Guard Ring
VI N +
VI N -
+VS
Figure 6. Example Guard Ring Layout for Inverting Comparator
Ground Sensing and Rail to Rail Output
The TP194x family implements a rail-to-rail topology that is capable of swinging to within 10mV of either rail. Since the
inputs can go 300mV beyond either rail, the comparator can easily perform ‘true ground’ sensing.
The maximum output current is a function of total supply voltage. As the supply voltage of the comparator increases,
the output current capability also increases. Attention must be paid to keep the junction temperature of the IC below
150°C when the output is in continuous short-circuit condition. The output of the amplifier has reverse-biased ESD
diodes connected to each supply. The output should not be forced more than 0.5V beyond either supply, otherwise
current will flow through these diodes.
ESD
The TP194x family has reverse-biased ESD protection diodes on all inputs and output. Input and output pins can not
be biased more than 300mV beyond either supply rail.
Power Supply Layout and Bypass
The TP194x family’s power supply pin should have a local bypass capacitor (i.e., 0.01μF to 0.1μF) within 2mm for
good high frequency performance. It can also use a bulk capacitor (i.e., 1μF or larger) within 100mm to provide large,
slow currents. This bulk capacitor can be shared with other analog parts.
Good ground layout improves performance by decreasing the amount of stray capacitance and noise at the
comparator’s inputs and outputs. To decrease stray capacitance, minimize PCB lengths and resistor leads, and place
external components as close to the comparator’ pins as possible.
Proper Board Layout
The TP194x family is a series of fast-switching, high-speed comparator and requires high-speed layout considerations.
For best results, the following layout guidelines should be followed:
1. Use a printed circuit board (PCB) with a good, unbroken low-inductance ground plane.
2. Place a decoupling capacitor (0.1μF ceramic, surface-mount capacitor) as close as possible to supply.
3. On the inputs and the output, keep lead lengths as short as possible to avoid unwanted parasitic feedback
around the comparator. Keep inputs away from the output.
4. Solder the device directly to the PCB rather than using a socket.
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TP1945/TP1946/TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
5. For slow-moving input signals, take care to prevent parasitic feedback. A small capacitor (1000 pF or less)
placed between the inputs can help eliminate oscillations in the transition region. This capacitor causes some
degradation to propagation delay when the impedance is low. The topside ground plane should be placed
between the output and inputs.
6. The ground pin ground trace should run under the device up to the bypass capacitor, thus shielding the inputs
from the outputs.
Typical Applications
IR Receiver
The TP1945 is an ideal candidate to be used as an infrared receiver shown in Figure 7. The infrared photo diode
creates a current relative to the amount of infrared light present. The current creates a voltage across RD. When this
voltage level cross the voltage applied by the voltage divider to the inverting input, the output transitions. Optional Ro
provides additional hysteresis for noise immunity.
VDD
VDD
Ro
R1
R2
RPU
Vo
TP1945
RD
Figure 7. IR Receiver
Logic-Level Translator
Figure 8 shows an application that converts 5V logic to 3V logic levels. The TP1945/TP1946/TP1948 is powered by
the +5V supply voltage, and the pull-up resistor for open-drain output is connected to the +3V supply voltage. This
configuration allows the full 5V logic swing without creating overvoltage on the 3V logic inputs. For 3V to 5V logic-level
translations, simply connect the 3V supply voltage to V+ and the 5V supply voltage to the pullup resistor.
5V(3V)
3V(5V)
R1
TP1945
TP1946
TP1948
RPU
Vo
Vr
R2
Figure 8. Logic-Level Translator
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TP1945 / TP1946 / TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Windowed Comparator
Figure 9 shows one approach to designing a windowed comparator using a single TP201946 chip. Choose different
thresholds by changing the values of R1, R2, and R3. When input voltage Vi reaches the overvoltage threshold VOH, the
OutB gets low. Once Vi falls to the undervoltage threshold VUH, the OutA gets low. When VUH<Vi<VOH, the output
PowerGood gets high.
V
V (R R R )/R
1
(1)
r
OH
1
2
3
V
V (R R R )/(R R
)
(2)
UH
r
1
2
3
1
2
VDD
Vi
R1
R2
R3
RPU
TP1946
+InA
+InB
-InA
-InB
OutA
OutB
Power
Good
Vr
Figure 9. Windowed Comparator
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TP1945/TP1946/TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Package Outline Dimensions
SOT23-5 / SOT23-6
D
A2
A1
θ
L1
e
Dimensions
Dimensions
In Inches
In Millimeters
Symbol
Min
Max
Min
Max
A1
A2
b
0.000
1.050
0.300
2.820
1.500
2.650
0.100
1.150
0.400
3.020
1.700
2.950
0.000
0.041
0.012
0.111
0.059
0.104
0.004
0.045
0.016
0.119
0.067
0.116
E1
D
E
E
E1
e
0.950TYP
0.037TYP
e1
L1
θ
1.800
0.300
0°
2.000
0.460
8°
0.071
0.012
0°
0.079
0.024
8°
b
e1
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TP1945 / TP1946 / TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Package Outline Dimensions
SC-70-5 / SC-70-6 (SOT353 / SOT363)
D
A2
C
A1
θ
L1
e
Dimensions
Dimensions In
Inches
In Millimeters
Symbol
Min
Max
Min
Max
A1
A2
b
0.000
0.900
0.150
0.080
2.000
1.150
2.150
0.100
1.000
0.350
0.150
2.200
1.350
2.450
0.000
0.035
0.006
0.003
0.079
0.045
0.085
0.004
0.039
0.014
0.006
0.087
0.053
0.096
E1
C
D
E
E
E1
e
0.650TYP
0.026TYP
e1
L1
θ
1.200
0.260
0°
1.400
0.460
8°
0.047
0.010
0°
0.055
0.018
8°
b
e1
REV1.0
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16
TP1945/TP1946/TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Package Outline Dimensions
SO-8 (SOIC-8)
A2
C
θ
L1
A1
e
E
D
Dimensions
Dimensions In
Inches
In Millimeters
Symbol
Min
Max
Min
Max
A1
A2
b
0.100
1.350
0.330
0.190
4.780
3.800
5.800
0.250
1.550
0.510
0.250
5.000
4.000
6.300
0.004
0.053
0.013
0.007
0.188
0.150
0.228
0.010
0.061
0.020
0.010
0.197
0.157
0.248
E1
C
D
E
E1
e
1.270TYP
0.050TYP
L1
θ
0.400
0°
1.270
8°
0.016
0°
0.050
8°
b
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TP1945 / TP1946 / TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Package Outline Dimensions
MSOP-8
Dimensions
Dimensions In
Inches
In Millimeters
Symbol
Min
Max
Min
Max
A
0.800
0.000
0.760
0.30 TYP
0.15 TYP
2.900
0.65 TYP
2.900
4.700
0.410
0°
1.200
0.200
0.970
0.031
0.000
0.030
0.012 TYP
0.006 TYP
0.114
0.026
0.114
0.185
0.016
0°
0.047
0.008
0.038
A1
A2
b
E
E1
C
D
3.100
0.122
e
e
b
E
3.100
5.100
0.650
6°
0.122
0.201
0.026
6°
E1
L1
θ
D
A1
R1
R
θ
L
L1
L2
REV1.0
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18
TP1945/TP1946/TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Package Outline Dimensions
SO-14 (SOIC-14)
D
Dimensions
In Millimeters
TYP
Symbol
MIN
1.35
0.10
1.25
0.36
8.53
5.80
3.80
MAX
1.75
0.25
1.65
0.49
8.73
6.20
4.00
A
A1
A2
b
1.60
E1
E
0.15
1.45
D
8.63
6.00
e
b
E
E1
e
3.90
1.27 BSC
0.60
L
0.45
0°
0.80
8°
A2
A
L1
L2
θ
1.04 REF
0.25 BSC
A1
L
L1
θ
L2
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REV1.0
19
TP1945 / TP1946 / TP1948
1.8V Micropower, RRIO, Open-Drain Output Comparators
Package Outline Dimensions
TSSOP-14
Dimensions
In Millimeters
E1
E
Symbol
MIN
-
TYP
MAX
1.20
0.15
1.05
0.28
0.19
5.06
6.60
4.50
A
A1
A2
b
-
0.05
0.90
0.20
0.10
4.86
6.20
4.30
-
1.00
-
e
c
c
-
4.96
D
D
E
6.40
E1
e
4.40
0.65 BSC
0.60
L
0.45
0.75
A1
L1
L2
R
1.00 REF
0.25 BSC
-
0.09
0°
-
R1
θ
-
8°
R
θ
L
L1
L2
REV1.0
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