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LTC1440/LTC1441/LTC1442 Ultralow Power Single/Dual Comparator with Reference
FEATURES
s s
DESCRIPTION
The LTC (R)1440/LTC1441/LTC1442 are ultralow power single and dual comparators with built-in references. The comparators feature less than 3.7A supply current over temperature (LTC1440), a 1.182V 1% reference, programmable hysteresis (LTC1440/LTC1442) and TTL/CMOS outputs that sink and source current. The reference output can drive a bypass capacitor of up to 0.01F without oscillation. The comparators operate from a single 2V to 11V supply or a dual 1V to 5.5V supply (LTC1440). Comparator hysteresis is easily programmed by using two resistors and the HYST pin (LTC1440/LTC1442). Each comparator's input operates from the negative supply to within 1.3V of the positive supply. The comparator output stage can continuously source up to 40mA. By eliminating the cross-conducting current that normally happens when the comparator changes logic states, the power supply glitches are eliminated. The LTC1440 is available in 8-pin PDIP, SO and MSOP packages. The LTC1441/LTC1442 are available in 8-pin PDIP and SO packages.
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Ultralow Quiescent Current: 2.1A Typ (LTC1440) Wide Supply Range: Single: 2V to 11V Dual: 1V to 5.5V Input Voltage Range Includes the Negative Supply Reference Output Drives 0.01F Capacitor Adjustable Hysteresis (LTC1440/LTC1442) TTL/CMOS Compatible Outputs 12s Propagation Delay with 10mV Overdrive No Crowbar Current 40mA Continuous Source Current Pin Compatible Upgrades for MAX921/922/923
APPLICATIONS
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Battery-Powered System Monitoring Threshold Detectors Window Comparators Oscillator Circuits
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Micropower 2.9V VCC Threshold Detector
3.3V
5.0
LTC1440 Supply Current vs Temperature
R1 1.65M 1% R2 1.13M 1%
7 V+
SUPPLY CURRENT (A)
4.5 4.0 3.5 3.0 2.5 2.0
V + = 5V V - = GND = 0V
3 IN +
+
8 OUT
4 IN-
-
5 HYST LTC1440
6 REF
V- 2
GND 1
1440 TA01
1.5 -40 -20
U
U
U
40 20 60 0 TEMPERATURE (C)
80
100
1440/1/2 TA02
1
LTC1440/LTC1441/LTC1442
ABSOLUTE MAXIMUM RATINGS
Voltage V + to V -, V + to GND, GND to V - ...........12V to - 0.3V IN +, IN -, HYST ................. (V + + 0.3V) to (V - - 0.3V) REF ................................... (V + + 0.3V) to (V - - 0.3V) OUT (LTC1440) .............. (V + + 0.3V) to (GND - 0.3V) OUT (LTC1441/LTC1442) ... (V + + 0.3V) to (V - - 0.3V) Current IN +, IN -, HYST ................................................. 20mA REF ................................................................... 20mA OUT .................................................................. 50mA OUT Short-Circuit Duration (V + 5.5V) ...... Continuous Power Dissipation............................................. 500mW Operating Temperature Range LTC144XC .............................................. 0C to 70C LTC144XI .......................................... - 40C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER INFORMATION
TOP VIEW GND 1 V
-
ORDER PART NUMBER
8 7 6 5 OUT V
+
2
IN + 3 IN
-
REF HYST
4
LTC1440CN8 LTC1440CS8 LTC1440IN8 LTC1440IS8 S8 PART MARKING 1440 1440I ORDER PART NUMBER
N8 PACKAGE 8-LEAD PDIP
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 130C/ W (N8) TJMAX = 150C, JA = 175C/ W (S8)
TOP VIEW OUT A 1 V- 2 IN A + 3 IN A
-
8 7 6 5
OUT B V+ IN B + IN B
-
4
LTC1441CN8 LTC1441CS8 LTC1441IN8 LTC1441IS8 S8 PART MARKING 1441 1441I
N8 PACKAGE 8-LEAD PDIP
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 130C/ W (N8) TJMAX = 150C, JA = 175C/ W (S8)
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Power Supply V+ Supply Voltage Range ICC Supply Current CONDITIONS
V + = 5V, V - = GND = 0V, TA = 25C unless otherwise noted.
MIN
q
IN + = IN - = 80mV HYST = REF (LTC1440/LTC1442)
2
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WW U
W
ORDER PART NUMBER
TOP VIEW GND V- IN + IN - 1 2 3 4 8 7 6 5 OUT V+ REF HYST
LTC1440CMS8
MS8 PACKAGE 8-LEAD PLASTIC MSOP
TJMAX = 150C, JA = 250C/ W
MS8 PART MARKING LTBX ORDER PART NUMBER
TOP VIEW OUT A 1 V- 2 IN A+ 3 IN B
-
8 7 6 5
OUT B V+ REF HYST
4
LTC1442CN8 LTC1442CS8 LTC1442IN8 LTC1442IS8 S8 PART MARKING 1442 1442I
N8 PACKAGE 8-LEAD PDIP
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 130C/ W (N8) TJMAX = 150C, JA = 175C/ W (S8)
TYP
MAX 11.0 3.7 5.7 5.7
UNITS V A A A
2.0 2.1 3.5 3.5
LTC1440 LTC1441 LTC1442
q q q
LTC1440/LTC1441/LTC1442
ELECTRICAL CHARACTERISTICS
V + = 5V, V - = GND = 0V, TA = 25C unless otherwise noted.
MIN
q q q q
SYMBOL PARAMETER CONDITIONS Comparator VOS Comparator Input Offset Voltage VCM = 2.5V Input Leakage Current (IN +, IN -) VIN + = VIN - = 2.5V IIN Input Leakage Current (HYST) VCM Comparator Input Common Mode Range CMRR Common Mode Rejection Ratio V - to V + - 1.3V PSRR Power Supply Rejection Ratio V + = 2V to 11V NOISE Voltage Noise 100Hz to 100kHz VHYST Hysteresis Input Voltage Range LTC1440/LTC1442 tPD Propagation Delay COUT = 100pF VOH VOL Output High Voltage Output Low Voltage IO = - 13mA IO = 1.8mA
TYP 3 0.01 0.02
MAX 10 1.0 1.0 V + - 1.3V 1 1 REF
UNITS mV nA nA V mV/V mV/V VRMS V s s V V V V V V A A mV mV mV VRMS
V- 0.1 0.1 100
q
REF - 50mV 15 8
Overdrive = 10mV Overdrive = 100mV
q
V + - 0.4V GND + 0.4V V - + 0.4V 1.170 1.164 1.164 100 10 1.182 1.194 1.200 1.200
LTC1440 LTC1441/LTC1442
q q q q q q q q
Reference VREF Reference Voltage
ISOURCE ISINK VREF
Reference Output Source Current Reference Output Sink Current Reference Source Current Reference Sink Current Voltage Noise
No Load C Temp Range LTC1440/LTC1442 I Temp Range No Load LTC1440 (MSOP) C Temp Range VREF 1mV (LTC1442) VREF 2.5mV (LTC1442) 0 ISOURCE 2mA (LTC1440) 0 ISINK 10A (LTC1440) 100Hz to 100kHz
200 20 0.8 0.5 100
5 1.5 5
NOISE
V + = 3V, V - = GND = 0V, TA = 25C unless otherwise noted. Power Supply V+ Supply Voltage Range ICC Supply Current IN + = IN - = 80mV HYST = REF (LTC1440/LTC1442) Comparator VOS Comparator Input Offset Voltage Input Leakage Current (IN +, IN -) IIN Input Leakage Current (HYST) VCM Comparator Input Common Mode Range CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio NOISE Voltage Noise VHYST Hysteresis Input Voltage Range tPD Propagation Delay VOH VOL Output High Voltage Output Low Voltage
q
2 2 3.5 3.5 3 0.01 0.02 V- 0.1 0.1 100
LTC1440 LTC1441 LTC1442
q q q q q q q
11 3.6 5.7 5.7 10 1 1 V + - 1.3V 1 1 REF
V A A A mV nA nA V mV/V mV/V VRMS V s s V V V
VCM = 1.5V VIN + = VIN - = 1.5V
V - to
V + - 1.3V
V + = 2V to 11V 100Hz to 100kHz LTC1440/LTC1442 COUT = 100pF IO = - 8mA IO = 0.8mA
q
REF - 50mV 14 5
Overdrive = 10mV Overdrive = 100mV
q
V + - 0.4V GND + 0.4V V - + 0.4V
LTC1440 LTC1441/LTC1442
q q
3
LTC1440/LTC1441/LTC1442
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Reference VREF Reference Voltage CONDITIONS No Load C Temp Range LTC1440/LTC1442 I Temp Range No Load LTC1440 (MSOP) C Temp Range VREF 1mV (LTC1442) VREF 2.5mV (LTC1442) 0 ISOURCE 1mA (LTC1440) 0 ISINK 10A (LTC1440) 100Hz to 100kHz
q q q q q q
V + = 3V, V - = GND = 0V, TA = 25C unless otherwise noted. MIN 1.170 1.164 1.164 60 10 TYP 1.182 MAX 1.194 1.200 1.200 UNITS V V V A A mV mV mV VRMS
ISOURCE ISINK VREF
Reference Output Source Current Reference Output Sink Current Reference Source Current Reference Sink Current Voltage Noise
120 20 0.8 0.5 100
5.5 1.5 5
NOISE
The q denotes specifications which apply over the full operating temperature range.
TYPICAL PERFORMANCE CHARACTERISTICS
Comparator Response Time vs Input Overdrive
INPUT VOLTAGE (mV) OUTPUT VOLTAGE (V)
4 3 2 1 0
TA = 25C
OUTPUT VOLTAGE (V)
5 100mV 50mV 10mV 20mV
SINK CURRENT (mA)
INPUT VOLTAGE (mV)
0 100 -1 0 2 4 6 RESPONSE TIME (s) 8 10
Comparator Short-Circuit Source Current vs Supply Voltage
160 140 10 12
SOURCE CURRENT (mA)
RESPONSE TIME (s)
100 80 60 40 20 0 0 1
OUT CONNECTED TO V - = GND = 0V
8
RESPONSE TIME (s)
120
3 SUPPLY VOLTAGE (V)
2
4
UW
1440/1/2 G01
Comparator Response Time vs Input Overdrives
5 4 3 2 1 0 TA = 25C 100mV 50mV 20mV 10mV
Comparator Short-Circuit Sink Current vs Supply Voltage
200 180 160 140 120 100 80 60 40 20 0 OUT CONNECTED TO V + TA = 25C
100 0 -1 0 2 4 6 8 10 12 14 16 18 RESPONSE TIME (s)
1440/1/2 G02
0
1
2
345678 SUPPLY VOLTAGE (V)
9
10
1440/1/2 G03
Comparator Response Time vs Load Capacitance with 100mV Input Overdrive
10000
Comparator Response Time at Low Supply Voltage
t PHL
1000 20mV OVERDRIVE 100
6
t PLH
10
4
100mV OVERDRIVE
2 4 5
1440/1/2 G04
1
0
20
60 80 40 LOAD CAPACITANCE (nF)
100
1440/1/2 G05
1.0
1.1
1.2 1.3 1.4 SUPPLY VOLTAGE (V)
1.5
1.6
1440/1/2 G06
LTC1440/LTC1441/LTC1442 TYPICAL PERFORMANCE CHARACTERISTICS
Comparator Output Voltage High vs Load Current
5 TA = 25C
OUTPUT VOLTAGE HIGH (V)
OUTPUT VOLTAGE HIGH (V)
TA = 25C 2.0 V + = 2V V + = 5V 1.0 V + = 3V
POSITIVE-TO-NEGATIVE INPUT VOLTAGE (mV)
4
V + = 5V
3 V + = 3V 2 V + = 2V
1 0 10 20 30 40 LOAD CURRENT (mA) 50 60
LTC1440 Supply Current vs Temperature
6
1.190
5
SUPPLY CURRENT (A)
REFERENCE OUTPUT VOLTAGE (V)
4
3 V = GND = 0V 2 V = GND = 0V 1 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (C)
1440/1/2 G10
Reference Output Voltage vs Output Load Current (Sink)
1.200
REFERENCE OUTPUT VOLTAGE (V)
1.195
REFERENCE VOLTAGE (V)
1.190 1.185 SINK 1.180 1.175 1.170
0
25 10 15 20 5 OUTPUT LOAD CURRENT (A)
UW
1440/1/2 G07
Comparator Output Voltage Low vs Load Current
2.5 80 60
LTC1440/LTC1442 Hysteresis Control
OUTPUT HIGH 40 20 0 -20 -40 -60 -80 0 10 20 30 VREF - VHYST (mV) 40 50
1440/1/2 G09
1.5
OUTPUT LOW
0.5
0
0
10
20 30 40 50 60 LOAD CURRENT (mA)
70
80
1440/1/2 G08
Reference Output Voltage vs Output Load Current
VCC = 5V 1.185 SOURCE 1.180 1.175 1.170 1.165 1.160 1.155 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT LOAD CURRENT (mA) 3.5
V + = 5V V - = -5V
V + = 3V -
V + = 5V -
1440/1/2 G11
Reference Voltage vs Temperature
1.186 1.184
V CC = 2V V CC = 5V
1.182 1.180 1.178 1.176 1.174 1.172
30
1.170 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (C)
1440/1/2 G13
1440/1/2 G12
5
LTC1440/LTC1441/LTC1442
PIN FUNCTIONS
1 GND LTC1440 OUT 8 7 1 2 OUT A LTC1441 OUT B 8 7 1 OUT A 2 LTC1442 OUT B 8 7
- 2V
+
3 IN+ 4 IN-
-
LTC1440
GND (Pin 1): Ground. Connect to V - for single supply operation. V - (Pin 2): Negative Supply. Connect to ground for single supply operation. Potential should be more negative than GND. IN + (Pin 3): Noninverting Comparator Input. Input common mode range from V - to V + -1.3V. Input current typically 10pA at 25C. IN - (Pin 4): Inverting Comparator Input. Input common mode range from V - to V + -1.3V. Input current typically 10pA at 25C. HYST (Pin 5): Hysteresis Input. Connect to REF if not used. Input voltage range is from VREF to VREF - 50mV. REF (Pin 6): Reference Output. 1.182V with respect to V -. Can source up to 200A and sink 15A at 25C. Drive 0.01F bypass capacitor without oscillation. V + (Pin 7): Positive Supply. 2V to 11V. OUT (Pin 8): Comparator CMOS Output. Swings from GND to V +. Output can source up to 40mA and sink 5mA.
LTC1441
OUT A (Pin 1): Comparator A CMOS Output. Swings from V - to V +. Output can source up to 40mA and sink 5mA. V - (Pin 2): Negative Supply. IN A+ (Pin 3): Noninverting Input of Comparator A. Input common mode range from V - to V + -1.3V. Input current typically 10pA at 25C. IN A- (Pin 4): Inverting Input of Comparator A. Input common mode range from V - to V + -1.3V. Input current typically 10pA at 25C.
6
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V+
V-
V+
V-
A
B
V+
+
REF 6 5 3 IN A+ 4 IN A-
A
-
-
B
+
IN B+ 6 IN B- 5 3 IN A
+
+
-
-
+
REF 6 HYST 5
HYST
4 IN B-
V-
1440/1/2 PD
IN B - (Pin 5): Inverting Input of Comparator B. Input common mode range from V - to V + -1.3V. Input current typically 10pA at 25C. IN B + (Pin 6): Noninverting Input of Comparator B. Input common mode range from V - to V + -1.3V. Input current typically 10pA at 25C. V + (Pin 7): Positive Supply. 2V to 11V. OUT B (Pin 8): Comparator B CMOS Output. Swings from V - to V +. Output can source up to 40mA and sink 5mA.
LTC1442
OUT A (Pin 1): Comparator A CMOS Output. Swings from V - to V +. Output can source up to 40mA and sink 5mA. V - (Pin 2): Negative Supply. IN A+ (Pin 3): Noninverting Input of Comparator A. Input common mode range from V - to V + -1.3V. Input current typically 10pA at 25C. IN B- (Pin 4): Inverting Input of Comparator B. Input common mode range from V - to V + -1.3V. Input current typically 10pA at 25C. HYST (Pin 5): Hysteresis Input. Connect to REF if not used. Input voltage range is from VREF to VREF - 50mV. REF (Pin 6): Reference Output. 1.182V with respect to V -. Can source up to 200A and sink 15A at 25C. Drive 0.01F bypass capacitor without oscillation. V + (Pin 7): Positive Supply. 2V to 11V. OUT B (Pin 8): Comparator B CMOS Output. Swings from V - to V +. Output can source up to 40mA and sink 5mA.
LTC1440/LTC1441/LTC1442
APPLICATIONS INFORMATION
LTC1440/LTC1441/LTC1442 are a family of micropower comparators with built-in 1.182V reference. Features include programmable hysteresis (LTC1440/LTC1442), wide supply voltage range (2V to 11V) and the ability of the reference to drive up to a 0.01F capacitor without oscillation. The comparators' CMOS outputs can source up to 40mA and the supply current glitches, that normally occur when switching logic states, have been eliminated. Power Supplies The comparator family operates from a single 2V to 11V supply. The LTC1440 includes a separate ground for the comparator output stage, allowing a split supply ranging from 1V to 5.5V. Connecting V - to GND on the LTC1440 will allow single supply operation. If the comparator output is required to source more than 1mA, or the supply source impedance is high, V + should be bypassed with a 0.1F capacitor. Comparator Inputs The comparator inputs can swing from the negative supply V - to within 1.3V max of the positive supply V +. The inputs can be forced 300mV below V - or above V + without damage and the typical input leakage current is only 10pA. Comparator Outputs The LTC1440 comparator output swings between GND and V + to assure TTL compatibility with a split supply. The LTC1441 and LTC1442 outputs swing between V - and V +. The outputs are capable of sourcing up to 40mA and sinking up to 5mA while still maintaining microampere quiescent currents. The output stage does not generate crowbar switching currents during transitions which helps minimize parasitic feedback through the supply pins. Voltage Reference The internal bandgap reference has a voltage of 1.182V referenced to V -. The reference accuracy is 1.5% from - 40C to 85C. It can source up to 200A and sink up to 20A with a 5V supply. The reference can drive a bypass
1000
RESISTOR VALUE (k)
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capacitor of up to 0.01F without oscillation and by inserting a series resistor, capacitance values up to 100F can be used (Figure 1). Figure 2 shows the resistor value required for different capacitor values to achieve critical damping. Bypassing the reference can help prevent false tripping of the comparators by preventing glitches on V + or reference load transients from disturbing the reference output voltage. Figure 3 shows the bypassed reference output with a square wave applied to the V + pin. Resistors R2 and R3 set 10mV of hysteresis voltage band while R1 damps the reference response. Note that the comparator output doesn't trip.
REFERENCE OUTPUT REF R1 LTC144X
C1
V-
1440/1/2 F01
Figure 1. Damping the Reference Output
100
10
1
0.1 0.001
0.01 0.1 1 CAPACITOR VALUE (F)
10
1440/1/2 F02
Figure 2. Damping Resistance vs Bypass Capacitor Value
7
LTC1440/LTC1441/LTC1442
APPLICATIONS INFORMATION
7 V+ 3 IN +
+
8 OUT
4 IN- 5V TO 8V
-
IREF 6 R1 5
V- 2 GND 1
1440/1/2 F04
5 HYST R2 10k R3 2.4M R1 430 C1 1F LTC1440
6 REF
Figure 3a. Reference Transient Response Test Circuit
8V V+ 5V 2mV/DIV VREF
OUT 2ms/DIV
1440/1/2 F03b
Figure 3b. Reference and Comparator Output Transient Response
Hysteresis Hysteresis can be added to the LTC1440 by connecting a resistor (R1) between the REF and HYST pins and a second resistor (R2) from HYST to V - (Figure 4). The difference between the upper and lower threshold voltages, or hysteresis voltage band (VHB), is equal to twice the voltage difference between the REF and HYST pins. When more hysteresis is added, the upper threshold increases the same amount as the low threshold decreases. The maximum voltage allowed between REF and HYST pins is 50mV, producing a maximum hysteresis voltage band of 100mV. The hysteresis band could vary by
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up to 15%. If hysteresis is not wanted, the HYST pin should be shorted to REF. Acceptable values for IREF range from 0.1A to 5A. If 2.4M is chosen for R2, then the value of R1 is equal to the value of VHB.
R1 = LTC1440 HYST V
-
REF
VHB (2)(IREF)
R2 = 2
(
1.182V - IREF
VHB 2
)
R2
1440/1/2 F03a
Figure 4. Programmable Hysteresis
Level Detector The LTC1440 is ideal for use as a micropower level detector as shown in Figure 5. R1 and R2 form a voltage divider from VIN to the noninverting comparator input. R3 and R4 set the hysteresis voltage, and R5 and C1 bypass the reference output. The following design procedure can be used to select the component values: 1. Choose the VIN voltage trip level, in this example 4.65V.
V IN R2 3.4M 1% R1 1.18M 1%
5V 7 V+ 3 IN +
+
8 OUT
4
IN-
-
5 HYST R3 15k 1% R4 2.4M 1% R5 430 5% C1 1F LTC1440
6 REF
V- 2
GND 1
1440/1/2 F05
Figure 5. Glitch-Free Level Detector with Hysteresis
LTC1440/LTC1441/LTC1442
APPLICATIONS INFORMATION
2. Calculate the required resistive divider ratio. Ratio = VREF / VIN Ratio = 1.182V/4.65V = 0.254 3. Choose the required hysteresis voltage band at the input VHBIN, in this example 60mV. Calculate the hysteresis voltage band referred to the comparator input VHB. VHB = (VHBIN)(Ratio) VHB = (60mV)(0.254) VHB = 15.24mV 4. Choose the values for R3 and R4 to set the hysteresis. R4 = 2.4M R3(k) = VHB = 15k 5. Choose the values for R1 and R2 to set the trip point.
4.65V R2 = 1.18M - 1 15mV 1.182V + 2 R2 = 3.40M
V 1.182V R1 = REF = = 1.18M IBIAS 1A VIN R2 = R1 - 1 VHB VREF + 2
TYPICAL APPLICATIONS
Low Battery Detect Operates Down to 1.5V
7 2-CELL NiCd 2.6M 3 IN + 1M V+ LTC1440 8 4 IN-
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Low Voltage Operation The guaranteed minimum operating voltage is 2V or (1V). As the total supply voltage is reduced below 2V, the performance degrades and the supply current falls. Both the reference and the comparator are still functioning with supply voltage down to 1.5V. The reference will have slightly worse temperature coefficient. While the comparator would have less output drive and the propagation delay increases. The useful input voltage range extends from the negative supply to a little under 1V below the positive supply, which is slightly closer to the positive rail than the device operating from higher supply voltages.
+
OUT
-
V+
6 REF 20k 5 1.3M HYST GND 1 V- 2
1440 TA06
1M
9
LTC1440/LTC1441/LTC1442
TYPICAL APPLICATIONS
10-Bit 30A A/D Converter
5V
EIN 0V TO 3V LT(R)1034 1.2V 100k
365k* 2N3809
150k
0.033F POLYSTYRENE
1N914 10M 74C00
*TRW-IRC MRT-5/+120ppm/C
10
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+ -
1M 5V 470k
32.768kHz
C2 1/2 LTC1441
+
-
1.2M 10pF C1 1/2 LTC1441
STATUS
VN2222LL 74C00 Q 74C74 D CONV COMMAND CLK
1440/1/2 TA03
74C00
74C00
DATA OUT
Q
32.768kHz "Watch Crystal" Oscillator
1M +V 470k
32.768kHz
+
1/2 LTC1441 OUT
-
1.2M 10pF
1440/1/2 TA05
LTC1440/LTC1441/LTC1442
PACKAGE DESCRIPTION
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381)
(
+0.025 0.325 -0.015 8.255 +0.635 -0.381
)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
0.016 - 0.050 0.406 - 1.270 *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400* (10.160) MAX 8 7 6 5
0.255 0.015* (6.477 0.381)
1
2
3
4 0.130 0.005 (3.302 0.127)
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 0.005 (0.127) MIN 0.100 0.010 (2.540 0.254) 0.125 (3.175) MIN 0.018 0.003 (0.457 0.076) 0.015 (0.380) MIN
N8 0695
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 8 7 6 5
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1
2
3
4
0.053 - 0.069 (1.346 - 1.752)
0.004 - 0.010 (0.101 - 0.254)
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) BSC
SO8 0695
11
LTC1440/LTC1441/LTC1442
TYPICAL APPLICATION
10kHz V/F Converter
+V 6.2V TO 12V
INPUT 0V TO 5V
10kHz TRIM 200k 1.2M* 0.01F
= HP5082-2810 = 1N4148 = 2N2222 * = 1% METAL FILM ** = POLYSTYRENE Q6 Q5 15k Q7
RELATED PARTS
PART NUMBER LT1178/LT1179 LT1351 LT1352/LT1353 LTC1443/LTC1444/LTC1445 DESCRIPTION Dual/Quad 17A Precision Single Supply Op Amps Single 250A, 3MHz, 200V/s Op Amp with Shutdown Dual/Quad 250A, 3MHz, 200V/s Op Amps Micropower Quad Comparator with 1% Reference COMMENTS 70V Max VOS, 5nA Max IBIAS C-LoadTM Op Amp Stable Driving Any Capacitive Load C-Load Op Amps Stable Driving Any Capacitive Load LTC1443 Has 1.182V Reference, LTC1444/LTC1445 Have 1.221V Reference and Adjustable Hysteresis
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 FAX: (408) 434-0507q TELEX: 499-3977 q www.linear-tech.com
q
U
LM334 2k*
+
2.2F
Q1 LT1034-1.2 LT1034-1.2
Q8
+
0.47F
-
C1 1/2 LTC1441
+
50pF
Q2
Q3 100k Q4 2M TYP 100Hz TRIM
100pF** fOUT 0kHz TO 10kHz 10M 74C14 2.7M 0.1F
-
C2 1/2 LTC1441
+
1440/1/2 TA04
C-Load is a trademark of Linear Technology Corporation.
144012fa LT/TP 0298 REV A 2K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1996

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