19-0137; Rev 1; 3/94
Improved Low-Power, CMOS Analog Switches with Latches
_______________General Description
Maxim’s redesigned DG421/DG423/DG425 monolithic analog switches now feature guaranteed on-resistance matching (3Ω max) between switches and on-resistance flatness over the signal range (4Ω max). These low onresistance switches (20Ω typ) conduct equally well in both directions. They guarantee a low charge injection of 15pC maximum and an ESD tolerance of 2000V minimum per Method 3015.7. Off leakage current over temperature has also been reduced (less than 5nA at +85°C).
The DG421/DG423/DG425 are precision, dual CMOS switches with latchable logic inputs that simplify interfacing with microprocessors (µPs). The single-pole/single- throw DG421 and double-pole/single-throw DG425 are normally open dual switches. The dual, single- pole/double-throw DG423 has two normally open and two normally closed switches. Fast switching times (175ns for tON and 145ns for tOFF) and low power consumption (35µW max) make these parts ideal for battery-powered applications requiring µP-compatible switches. Operation is from a single +10V to +30V supply, or bipolar ±4.5V to ±20V supplies. Fabricated with the same 44V silicon-gate process, these switches have rail-to-rail signal handling capabilities.
_______________________Applications
Sample-and-Hold Circuits |
Modems |
Fax Machines |
Test Equipment |
Battery-Operated Systems |
PBX, PABX |
Guidance and Control Systems |
Military Radios |
Audio Signal Routing |
Communication Systems |
______________________New Features
♦Plug-In Upgrades for Industry-Standard DG421/DG423/DG425
♦Improved r(DS)ON Match Between Channels (3Ω max)
♦Guaranteed rFLAT(ON) Over Signal Range (4Ω max)
♦Improved Charge Injection (15pC max)
♦Improved Off Leakage Current Over Temperature (<5nA at +85°C)
♦Withstands Electrostatic Discharge (2000V min) per Method 3015.7
__________________Existing Features
♦Low rDS(ON) (35Ω max)
♦Single-Supply Operation +10V to +30V Bipolar-Supply Operation ±4.5V to ±20V
♦Low Power Consumption (35µW max)
♦Rail-to-Rail Signal Handling Capability
♦TTL/CMOS-Logic Compatible
______________Ordering Information
PART |
TEMP. RANGE |
PIN-PACKAGE |
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DG421CJ |
0°C to +70°C |
16 |
Plastic DIP |
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DG421CY |
0°C to +70°C |
16 |
SO |
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DG421C/D |
0°C to +70°C |
Dice* |
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DG421DJ |
-40°C to +85°C |
16 |
Plastic DIP |
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DG421DY |
-40°C to +85°C |
16 |
SO |
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DG421DK |
-40°C to +85°C |
16 |
CERDIP |
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DG421AK |
-55°C to +125°C |
16 |
CERDIP** |
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Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
**Contact factory for availability and processing to MIL-STD-883B.
__Functional Diagrams/Truth Tables |
_________________Pin Configurations |
S1 |
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D1 |
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WR |
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IN1 |
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CK |
DG421 TRUTH TABLE |
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D |
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Q |
WR RS |
IN |
SWITCH |
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R |
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0 |
Off |
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IN2 |
CK |
DG421 |
0 |
1 |
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D |
Q |
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1 |
On |
RS |
R |
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LOGIC "O" £ 0.8V |
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S2 |
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D2 |
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LOGIC "1" ³ |
2.4V |
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SWITCHES SHOWN FOR |
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TWO SPST SWITCHES |
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LOGIC "1" INPUT |
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PER PACKAGE |
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Functional Diagrams/Truth Tables continued at end of data sheet.
TOP VIEW
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D1 |
1 |
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16 |
S1 |
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WR |
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2 |
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15 |
IN1 |
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N.C. |
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V- |
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3 |
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14 |
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N.C. |
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DG421 |
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GND |
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13 |
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N.C. |
5 |
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12 |
VL |
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N.C. |
6 |
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11 |
V+ |
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RS |
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7 |
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10 |
IN2 |
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D2 |
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S2 |
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8 |
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9 |
DIP
N.C. = No Internal Connection
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
DG421/DG423/DG425
Call toll free 1-800-998-8800 for free samples or literature.
DG421/DG423/DG425
Improved Low-Power,
CMOS Analog Switches with Latches
ABSOLUTE MAXIMUM RATINGS
Voltage Referenced to V- |
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V+ ............................................................ |
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44V |
GND ......................................................... |
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25V |
VL .................................. |
(GND - 0.3V) to (V+ + 0.3V) |
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Digital Inputs, VS, VD (Note 1).............. |
(V- - 2V) to (V+ + 2V) |
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Current (any terminal, except S or D) ................................. |
30mA |
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Continuous Current, S or D ................................................. |
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20mA |
Peak Current, S or D (pulsed at 1ms, 10% duty cycle max)... |
100mA |
Continuous Power Dissipation (TA = +70°C) |
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842mW |
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C) |
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20-Pin PLCC (derate 10.00mW/°C above +70°C) ..... |
800mW |
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16-Pin CERDIP (derate 10.00mW/°C above +70°C) ... |
800mW |
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Operating Temperature Ranges |
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DG42_C_ .......................................... |
0°C to +70°C |
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DG42_D_ ....................................... |
-40°C to +85°C |
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DG42_A_ . ..................................... |
-55°C to +125°C |
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Storage Temperature Ranges |
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DG42_C_/DG42_D_ ........................... |
-65°C to +125°C |
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DG42_A_ ..................................... |
-65°C to +150°C |
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Lead Temperature (soldering, 10sec).................... |
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+300°C |
Note 1: Signals on S, D, or IN exceeding V+ or V- are clamped by internal diodes. Limit forward current to maximum current ratings.
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = 15V, V- = -15V, VL = +5V, GND = 0V, VINH = +2.4V, VINL = +0.8V, TA = TMIN to TMAX, unless otherwise noted.)
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DG42_C, DG42_D |
DG42_A |
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PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
MIN |
TYP |
MAX |
UNITS |
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(Note 2) |
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(Note 2) |
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SWITCH |
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Analog Signal Range |
VANALOG |
(Note 3) |
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-15 |
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15 |
-15 |
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15 |
V |
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V+ = 13.5V, |
TA = +25°C |
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20 |
45 |
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20 |
35 |
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Drain-Source |
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V- = -13.5V, |
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rDS(ON) |
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Ω |
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On-Resistance |
IS = -10mA, |
TA = TMIN to TMAX |
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45 |
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45 |
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VD = ±10V |
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On-Resistance Match |
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V+ = 16.5V, |
TA = +25°C |
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3 |
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3 |
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V- = -16.5V, |
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Between Channels |
rDS(ON) |
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Ω |
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IS = -10mA, |
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(Note 4) |
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TA = TMIN to TMAX |
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4 |
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4 |
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VD = ±10V |
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V+ = 15V, |
TA = +25°C |
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4 |
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4 |
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On-Resistance |
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V- = -15V, |
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rFLAT(ON) |
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Ω |
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Flatness (Note 4) |
IS = -10mA, |
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TA = TMIN to TMAX |
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5 |
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5 |
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VD = ±5V |
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Source-Off |
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V+ = 16.5V, |
TA = +25°C |
-0.50 |
-0.01 |
0.50 |
-0.25 |
-0.01 |
0.25 |
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V- = -16.5V, |
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Leakage Current |
IS(OFF) |
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nA |
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VD = ±15.5V, |
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(Note 5) |
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TA = TMIN to TMAX |
-5 |
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5 |
-10 |
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10 |
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VS = m 15.5V |
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Drain-Off |
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V+ = 16.5V, |
TA = +25°C |
-0.50 |
-0.01 |
0.50 |
-0.25 |
-0.01 |
0.25 |
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V- = -16.5V, |
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Leakage Current |
ID(OFF) |
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nA |
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VD = ±15.5V, |
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(Note 5) |
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TA = TMIN to TMAX |
-5 |
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5 |
-10 |
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10 |
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VS = m 15.5V |
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Drain-On |
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V+ = 16.5V, |
TA = +25°C |
-1.0 |
-0.04 |
1.0 |
-0.40 |
-0.04 |
0.40 |
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V- = -16.5V, |
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Leakage Current |
ID(ON) |
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nA |
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VD = ±15.5V, |
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(Note 5) |
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TA = TMIN to TMAX |
-10 |
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10 |
-20 |
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20 |
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VS = ±15.5V |
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2 _______________________________________________________________________________________
Improved Low-Power, CMOS Analog Switches with Latches
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, V- = -15V, VL = +5V, GND = 0V, VINH = +2.4V, VINL = +0.8V, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER |
SYMBOL |
CONDITIONS |
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MIN |
TYP |
MAX |
UNITS |
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(Note 2) |
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INPUT |
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Input Current with Input Voltage High |
IINH |
IN = 2.4V, all others = 0.8V |
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-0.50 |
0.005 |
0.50 |
µA |
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Input Current with Input Voltage Low |
IINL |
IN = 0.8V, all others = 2.4V |
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-0.50 |
0.005 |
0.50 |
µA |
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SUPPLY |
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Power Supply Range |
V+, V- |
(Note 3) |
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±4.5 |
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±20 |
V |
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All channels on or off, |
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TA = +25°C |
-1.0 |
0.01 |
1.0 |
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Positive Supply Current |
I+ |
V+ = 16.5V, V- = -16.5V, |
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µA |
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TA = TMIN to TMAX |
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-5.0 |
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5.0 |
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VIN = 0V or 5V |
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All channels on or off, |
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TA = +25°C |
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-1.0 |
-0.01 |
1.0 |
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Negative Supply Current |
I- |
V+ = 16.5V, V- = -16.5V, |
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µA |
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TA = TMIN to TMAX |
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-5.0 |
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5.0 |
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VIN = 0V or 5V |
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All channels on or off, |
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TA = +25°C |
-1.0 |
-0.01 |
1.0 |
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Logic Supply Current |
IL |
V+ = 16.5V, V- = -16.5V, |
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µA |
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TA = TMIN to TMAX |
-5.0 |
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5.0 |
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VIN = 0V or 5V |
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All channels on or off, |
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TA = +25°C |
-1.0 |
-0.01 |
1.0 |
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Ground Current |
IGND |
V+ = 16.5V, V- = -16.5V, |
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µA |
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TA = TMIN to TMAX |
-5.0 |
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5.0 |
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VIN = 0V or 5V |
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DYNAMIC |
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Turn-On Time |
tON |
Figure 2 |
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TA = +25°C |
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150 |
250 |
ns |
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TA = TMIN to TMAX |
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300 |
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Turn-Off Time |
tOFF |
Figure 2 |
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200 |
ns |
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tWW |
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TA = +25°C |
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200 |
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VS = ±10V, |
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TA = -55°C to +125°C |
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200 |
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Latch Timing |
tDW |
RL = 300Ω , |
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TA = +25°C |
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100 |
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CL = 35pF, |
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TA = -55°C to +125°C |
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100 |
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tWD |
Figure 3 |
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TA = +25°C |
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60 |
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TA = -55°C to +125°C |
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100 |
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Break-Before-Make Interval (Note 3) |
tD |
DG423, Figure 4 |
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TA = +25°C |
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5 |
25 |
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Charge Injection (Note 3) |
Q |
CL = 10nF, VG = 0V, |
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TA = +25°C |
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10 |
15 |
pC |
RG = 0Ω , Figure 5 |
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Off-Isolation Rejection Ratio |
OIRR |
RL = 100Ω , CL = 5pF, |
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TA = +25°C |
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72 |
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dB |
(Note 6) |
f = 1MHz, Figure 6 |
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Crosstalk (Note 7) |
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RL = 50Ω , CL = 5pF, |
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TA = +25°C |
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90 |
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dB |
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f = 1MHz, Figure 7 |
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Drain-Off Capacitance |
CD(OFF) |
f = 1MHz, Figure 8 |
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TA = +25°C |
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12 |
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pF |
Source-Off Capacitance |
CS(OFF) |
f = 1MHz, Figure 8 |
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TA = +25°C |
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12 |
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pF |
Drain-On Capacitance |
CD(ON) |
f = 1MHz, Figure 9 |
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TA = +25°C |
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39 |
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pF |
Source-On Capacitance |
CS(ON) |
f = 1MHz, Figure 9 |
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TA = +25°C |
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39 |
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pF |
Note 2: Typical values are for design aid only, are not guaranteed, and are not subject to production testing. The algebraic convention, where the most negative value is a minimum and the most positive value a maximum, is used in this data sheet.
Note 3: Guaranteed by design.
Note 4: On-resistance match between channels and flatness are guaranteed only with bipolar-supply operation. Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured at the extremes of the specified analog signal range.
Note 5: Leakage parameters IS(OFF), ID(OFF), and ID(ON) are 100% tested at the maximum rated hot temperature and guaranteed by correlation at +25°C.
Note 6: Off-Isolation Rejection Ratio = 20log (VD/VS), VD = output, VS = input to off switch.
Note 7: Between any two switches.
_______________________________________________________________________________________ 3
DG421/DG423/DG425
DG421/DG423/DG425
Improved Low-Power,
CMOS Analog Switches with Latches
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
ON-RESISTANCE vs. VD |
ON-RESISTANCE vs. VD AND |
ON-RESISTANCE vs. VD |
(DUAL-SUPPLIES) |
TEMPERATURE (DUAL SUPPLIES) |
(SINGLE SUPPLY) |
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55 |
B: V+ = 10V, V- = -10V |
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MAX401-1 |
35 |
MAX401-2 |
140 |
MAX401-3 |
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50 |
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V- = 0V |
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A: V+ = 5V, V- = -5V |
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45 |
C: V+ = 15V, V- = -15V |
A |
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30 |
TA = +125°C |
120 |
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40 |
D: V+ = 20V, V- = -20V |
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TA = +85°C |
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25 |
TA = +25°C |
100 |
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(Ω) |
35 |
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(Ω) |
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(Ω) |
V+ = 5V |
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(ON) |
30 |
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B |
(ON) |
20 |
(ON) |
80 |
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DS |
25 |
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DS |
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DS |
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r |
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r |
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r |
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20 |
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C |
15 |
TA = -55°C |
60 |
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D |
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15 |
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V+ = 10V |
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10 |
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40 |
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10 |
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V+ = 15V, V- = -15V |
V+ = 15V |
V+ = 20V |
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5 |
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5 |
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20 |
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-20 |
-10 |
0 |
10 |
20 |
-20 |
-10 |
0 |
10 |
20 |
0 |
5 |
10 |
15 |
20 |
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VD (V) |
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VD (V) |
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VD (V) |
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rDS (ON) (Ω)
|
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ON-RESISTANCE vs. VD AND |
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TEMPERATURE (SINGLE SUPPLY) |
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||||||||||
70 |
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-4 |
|
60 |
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MAX401 |
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TA = |
+125°C |
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50 |
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TA = |
+85°C |
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40 |
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TA = |
+25°C |
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30 |
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20 |
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V+ = 12V, V- = 0V |
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10 |
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0 |
5 |
10 |
|
15 |
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20 |
VD (V)
|
100 |
|
10 |
(nA) |
1 |
LEAKAGEOFF |
0.01 |
|
0.1 |
|
0.001 |
0.0001
OFF LEAKAGE CURRENTS vs.
TEMPERATURE
|
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|
5- |
|
V+ = 16.5V |
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|
MAX401 |
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||
|
V- = -16.5V |
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VD = ±15V |
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VS = ±15V |
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|
-75 |
25 |
125 |
TEMPERATURE (°C)
|
100 |
|
10 |
(nA) |
1 |
LEAKAGEON |
0.01 |
|
0.1 |
|
0.001 |
0.0001
ON LEAKAGE CURRENTS vs.
TEMPERATURE
|
|
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|
6- |
|
V+ = 16.5V |
|
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|
MAX401 |
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||
|
V- = -16.5V |
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VD = ±15V |
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VS = ±15V |
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|
-75 |
25 |
125 |
TEMPERATURE (°C)
|
|
|
CHARGE INJECTION vs. |
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|
SUPPLY CURRENT vs. |
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|||||||||||
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|
ANALOG VOLTAGE |
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|
TEMPERATURE |
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|||||||||
|
60 |
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|
MAX401-7 |
|
|
100 |
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|
MAX401-8 |
|
40 |
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|
10 |
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||
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||
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||
|
20 |
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|
A) |
|
1 |
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I+ at V+ = 16.5V |
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|
||||
(pC) |
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(μ |
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||||
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||
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|
I |
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0 |
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L |
0.1 |
|
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|
Q |
|
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|
I-, |
|
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|
|
I- at |
V- = -16.5V |
|
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|||
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|
||||||||
|
-20 |
|
|
|
|
|
|
|
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|
|
I+, |
|
0.01 |
|
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|
|
IL |
at VL = 5V |
|
|
|
||
|
-40 |
|
|
|
|
|
|
|
|
|
|
|
0.001 |
|
|
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|
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|
|
|
|
|||
|
|
|
V+ = 15V, V- = -15V |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
|
-60 |
|
|
|
|
|
|
|
|
|
|
0.0001 |
|
|
|
|
|
|
|
|
|
||
|
-20 |
-10 |
0 |
|
10 |
20 |
|
|
-75 |
25 |
|
125 |
|||||||||||
|
|
|
|
|
VD (V) |
|
|
|
|
|
|
|
|
|
TEMPERATURE (°C) |
|
|
4 _______________________________________________________________________________________