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19-3926; Rev 0; 3/91
Quad, SPST Analog Switches
_______________General Description
The DG308A/DG309 are quad, single-pole-single-throw (SPST) analog switches. The DG308A is normally open (SPST, NO), while the DG309 is normally closed (SPST, NC). Both parts feature fast switching speeds and low onresistance over the analog range. Other features include a turn-on time under 120ns, a turn-off time under 90ns, and a channel on-resistance of 60. CMOS inputs provide reduced input loading and very low leakage currents. Both parts feature a 44V maximum breakdown voltage rating that allows 30V peak-to-peak switch-off blocking capacity. The DG308A/DG309 can be used with split supplies (5V to 20V) or a single positive supply (+5V to +30V), while retaining CMOS-logic-compatible inputs.
____________________________Features
o 60 rDS(ON) o Single/Bipolar-Supply Operation o CMOS Logic Compatible o Monolithic, Low-Power CMOS Design
DG308A/DG309
______________Ordering Information
PART DG308ACJ DG308ACY DG308ACK DG308AC/D DG308ADJ DG308ADY DG308ADK DG308AAK DG309CJ DG309CY DG309CK DG309C/D DG309DJ DG309DY DG309DK DG309AK TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C -55C to +125C 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -40C to +85C -55C to +125C PIN-PACKAGE 16 Plastic DIP 16 Narrow SO 16 CERDIP Dice* 16 Plastic DIP 16 Narrow SO 16 CERDIP 16 CERDIP** 16 Plastic DIP 16 Narrow SO 16 CERDIP Dice* 16 Plastic DIP 16 Narrow SO 16 CERDIP 16 CERDIP**
________________________Applications
Sample-and-Hold Circuits Test Equipment Communications Systems PBX, PABX Guidance and Control Systems Heads-Up Displays Military Radios
* Contact factory for dice specifications. ** Contact factory for availability and processing to MIL-STD-883.
__________Typical Operating Circuit
______Pin Configuration/Truth Table
TOP VIEW
IN1 1 D1 2 S1 3 IN2 D2 S2 V+ (SUBSTRATE) N.C. S3 D3 IN3
16 15
VIN 10V
5k
*1 2 3
16 * 15
40k
5k
DG308A DG309
14 13 +15V 12 11 10 9* 20k
DG308A DG309
14 13 12 11 10 9
VOUT
V- 4 GND 5 S4 6 D4 7 IN4 8 DIP/SO
LOGIC 0 1 TRUTH TABLE DG308A OFF ON
-15V 4 5 10k 6 7 *8
PROGRAMMABLE-GAIN AMPLIFIER * PINS 1, 8, 9, AND 16 ARE LOGIC-CONTROL INPUTS.
DG309 ON OFF
________________________________________________________________ Maxim Integrated Products
1
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Quad, SPST Analog Switches DG308A/DG309
ABSOLUTE MAXIMUM RATINGS
Voltage Referenced to VV+ ....................................................................................+44V GND .................................................................................+25V Digital Inputs VS, VD................(V- - 2V) to (V+ + 2V) or 20mA, whichever occurs first Current into Any Terminal (except S or D) ..........................30mA Continuous Current (S or D)................................................20mA Peak Current (S or D) (pulsed at 1ms, 10% duty cycle max) ............................70mA Continuous Power Dissipation (TA = +70C) (Note 1) Plastic DIP (derate 10.53mW/C above +70C)............842mW Narrow SO (derate 8.70mW/C above +70C) .............696mW CERDIP (derate 10.00mW/C above +70C) ................800mW Operating Temperature Ranges DG308AC_/DG309C_ .........................................0C to +70C DG308AD_/DG309D_ ......................................-40C to +85C DG308AAK/DG309AK ...................................-55C to +125C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
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, TA = TMIN to TMAX, unless otherwise noted.) (Note 2) PARAMETER SWITCH Analog Signal Range VANALOG Drain-Source On-Resistance VIN = 11V (DG308A), VIN = 3.5V (DG309), IS = 1mA, VD = 10V or -10V VIN = 3.5V (DG308A), VIN = 11V (DG309), VS = 14V, VD = -14V VIN = 3.5V (DG308A), VIN = 11V (DG309), VS = -14V, VD = 14V VIN = 3.5V (DG308A), VIN = 11V (DG309), VS = 14V, VD = -14V VIN = 3.5V (DG308A), VIN = 11V (DG309), VS = -14V, VD = 14V VIN =11V (DG308A), VIN = 3.5V (DG309), VS = VD = +14V VIN = 11V (DG308A), VIN = 3.5V (DG309), VS = VD = -14V TA = +25C TA = +25C, TMIN TA = TMAX TA = +25C TA = TMAX TA = +25C TA = TMAX TA = +25C TA = TMAX TA = +25C TA = TMAX TA = +25C TA = TMAX TA = +25C TA = TMAX -1 -100 -1 -100 -1 -100 -1 -100 -2 -200 -2 -200 0.1 0.1 0.1 0.1 -0.1 -15 60 95 0.1 15 100 150 1 100 1 100 1 100 1 100 2 200 2 200 -5 -100 -5 -100 -5 -100 -5 -100 -5 -200 -5 -200 0.1 0.1 0.1 0.1 0.1 -15 60 80 0.1 15 100 125 5 100 nA 5 100 5 100 nA 5 100 5 200 nA 5 200 V SYMBOL CONDITIONS DG30_AK MIN TYP MAX DG30_C/D MIN TYP MAX UNITS
rDS(ON)
Source-Off Leakage Current
IS(OFF)
Drain-Off Leakage Current
ID(OFF)
Drain-On Leakage Current
ID(ON)
INPUT Input Current with Input Voltage High Input Current with Input Voltage Low IINH IINL VIN = 15V VIN = 0V TA = +25C, TMAX TA = +25C, TMAX -1 -1 0.001 -0.001 1 1 -1 -1 0.001 0.001 1 1 A A
2
_______________________________________________________________________________________
Quad, SPST Analog Switches
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 15V, V- = -15V, TA = TMIN to TMAX, unless otherwise noted.) (Note 2) PARAMETER SUPPLY Positive Supply Current Negative Supply Current DYNAMIC Turn-On Time Turn-Off Time Charge Injection Off Isolation (Note 3) Source-Off Capacitance Drain-Off Capacitance Channel-On Capacitance tON tOFF Q OIRR CS(OFF) CD(OFF) Figure 1 Figure 1 CL = 0.01F, VGEN = 0V, RGEN = 0 VIN = 0V (DG308A), VIN = 15V (DG309), ZL = 75, VS = 2Vp-p, f = 500kHz VIN = 0V (DG308A), VIN = 15V (DG309), f = 140kHz, VS = 0V VIN = 0V (DG308A), VIN = 15V (DG309), f = 140kHz, VS = 0V 130 90 -10 78 11 8 27 200 150 130 90 -10 78 11 8 27 200 150 ns ns pC dB pF pF pF I+ IAll channels on or off, VIN = 0V or 15V All channels on or off, VIN = 0V or 15V TA = +25C TA = TMAX TA = +25C TA = TMAX -10 -0.001 -100 -10 0.001 10 100 10 -100 -100 0.001 100 100 -100 -0.001 100 A A SYMBOL CONDITIONS DG30_AK MIN TYP MAX DG30_C/D MIN TYP MAX UNITS
DG308A/DG309
CD(ON) + VIN = 0V (DG308A), VIN = 15V (DG309), CS(ON) VD = VS = 0V
Note 1: All leads are soldered or welded to the PC board. Note 2: 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: Off isolation = 20log10 VD/VS, VD = output, VS = input to off switch.
+15V V+ LOGIC INPUT IN1 50% tr < 20ns tf < 20ns OV SWITCH INPUT VS 0.9VO SWITCH OUTPUT VO 0V tOFF SWITCH INPUT VS = +3V
S1
D1 RL 1k
SWITCH OUTPUT VO CL 35pF
IN1 LOGIC INPUT GND 0V V-15V
0.9VO
tON
(REPEAT TEST FOR S2, S3, AND S4)
RL VO = VS RL + r DS(ON)
Figure 1. Switching-Time Test Circuit
_______________________________________________________________________________________
3
Quad, SPST Analog Switches DG308A/DG309
__________________________________________Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
DRAIN-SOURCE ON-RESISTANCE vs. DRAIN VOLTAGE & POWER SUPPLIES
DG308A309 TOC01
DRAIN-SOURCE ON-RESISTANCE vs. DRAIN VOLTAGE & POWER SUPPLIES
TA = +25C V+ = 5V
DG308A309 TOC04 DG308A309 TOC03
500 V+ = 5V 400 rDS(ON) ()
250
TA = +25C V- = GND
200 rDS(ON) ()
300 V+ = 10V 200 V+ = 15V 100 V+ = 20V 0 0 5 10 VD (V) 15 20
150 V+ = 10V
100
50 V+ = 12V 0 -15 -10 -5 0 VD (V)
V+ = 15V
5
10
15
POWER-SUPPLY CURRENT AND VOLTAGE vs. TEMPERATURE
DG308A309 TOC02
LEAKAGE CURRENTS vs. ANALOG VOLTAGE
20 10 0 -10 -20 -30 IS(OFF) ID(OFF) ID(ON) TA = +25C VCC = 15V
800 700 600 ISUPPLY (nA) 500 400
TA = +25C V- = GND V+ = 44V
V+ = 30V 300 200 100 0 -50 -25 0 25 50 75 100 125 V+ = 10V V+ = 5V
IS, ID (pA)
-12
-6
0 VANALOG (V)
6
12
TEMPERATURE (C)
_____________________Pin Description
PIN 1, 8, 9, 16 2, 7, 10, 15 3, 6, 11, 14 4 5 12 13 NAME IN1-IN4 D1-D4 S1-S4 VGND N.C. V+ FUNCTION Logic Control Inputs Drain Output Source Input Negative Supply Voltage Input Ground No Connect. Not internally connected. Positive Supply Voltage Input. Connected to substrate.
__________Applications Information
The DG308A/DG309 switch positive analog signals while using a single positive supply, allowing use in applications where only one supply is available. The disadvantages of using a single supply are slower switching speed and increased r DS(ON) . The Power-Supply Current and Voltage vs. Temperature graph shows the typical curve for a single-supply design. As stated in the Absolute Maximum Ratings, the analog voltage should not go above or below the supply voltages, which are V+ and 0V in single-supply operation.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
4 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1991 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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