ADVANCED LINEAR DEVICES, INC. ALD421/ALD422M CMOS LOW VOLTAGE, LOW CHARGE INJECTION QUAD SPST ANALOG SWITCHES GENERAL DESCRIPTION The ALD421/ALD422M are quad SPST CMOS analog switches specifically developed for 3 to 12 volt applications where low charge injection and low leakage currents are important analog switch operating characteristics. The main features are precision matching, charge compensation circuitry, fast switching, low on-resistance and micropower consumption. The ALD421 operates in break-before-make switching whereas the ALD422M operates in make-before-break switching. The ALD421/ALD422M are designed for precision applications such as charge amplifiers, sample and hold amplifiers, data converter switches, and programmable gain amplifiers. These switches are also excellent for general purpose switching applications for micropower battery operated systems. APPLICATIONS INFORMATION The ALD421/ALD422M are designed to operate with standard single or dual power supplies of +3V to 1V or ±1.5V to ±5V. Functionality extends down to +2V or ±1V power supply, making it suitable for lithium battery or rechargeable battery operated systems where power efficiency and performance are important design parameters. These switches feature na quiescent current and interface directly to CMOS logic levels from microprocessor or logic interface circuits. Built- in level shifters at the input stage provide for dual supply analog signal switching. On the board level, low charge injection and fast operation can be obtained by using short leads, minimizing input and output capacitances, and by adequate bypass capacitors placed on the board at the supply nodes. For more information, see Application Note AN42. The ALD421/422M are manufactured with Advanced Linear Devices' enhanced ACMOS silicon gate CMOS process, and are also part of the linear elements in Advanced Linear Devices' "Function-Specific" ASIC. ORDERING INFORMATION Operating Temperature Range -55 C to +125 C C to +7 C C to +7 C 16-Pin 16-Pin 16-Pin CERDIP Plastic Dip SOIC Package Package Package ALD421 DC ALD421 PC ALD421 SC ALD422M DC ALD422M PC ALD422M SC LOGIC TABLE Input Logic Switch State ALD421 ALD422M On Off 1 Off On * Contact factory for industrial temperature range. FEATURES 3V, 5V & 1V supply operation ±1.5V, ±2.5V & ±5V supply operation.1µw power dissipation 1pC charge injection Rail-to-rail signal range Low on-resistance pa leakage current 421 break-before-make switching 422M make-before-break switching Built-in dual supply level translator BENEFITS Fast effective signal throughput Low switching transients Low signal loss Essentially no DC power consumption Full analog signal range over power supply rail Flexible power supply range for battery operated systems APPLICATIONS Low level signal conditioning circuits Portable battery operated instruments Computer peripherals PCMCIA Fast sample and hold Analog signal multiplexer Programmable gain amplifiers Switched capacitor circuits Micropower based systems Video/audio switches Feedback control systems PIN CONFIGURATION / BLOCK DIAGRAM IN 1 D 1 S 1 V - S 4 D 4 1 2 3 4 5 6 7 DC, PC, SC PACKAGE 14 13 12 11 1 S 2 V + IN 4 8 9 IN 3 16 15 IN 2 D 2 NC S 3 D 3 25.1 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 9489-176 Tel: (48) 747-1155 Fax: (48) 747-1286 http://www.aldinc.com
ABSOLUTE MAXIMUM RATINGS Supply voltage, V+ referenced to V- -.3V to +13.2V -.3V to +13.2V Terminal voltage range (any terminal) Note 1 (V- -.3)V to (V+ +.3)V Power dissipation 6 mw Operating temperature range PC, SC package C to +7 C DC package -55 C to +125 C Storage temperature range -65 C to +15 C Lead temperature, 1 seconds +26 C DC current (any terminal) 1mA POWER SUPPLY RANGE 421/422M (PC,SC) 421/422M (DC) Parameter Symbol Min Typ Max Min Typ Max Unit Supply V SUPPLY ±1.5 ±6. ±1.5 ±6. V Dual Supply Voltage 3. 12. 3. 12. V Single Supply DC ELECTRICAL CHARACTERISTICS T A = 25 C V+ = +5.V, V- = -5.V =.V unless otherwise specified 421/422M (PC,SC) 421/422M (DC) Parameter Symbol Min Typ Max Min Typ Max Unit Test Conditions Analog Signal Range V A -5. 5. -5. 5. V On - Resistance R ON 9 135 9 135 Ω V A = V I A = 1mA 12 18 C to +7 C 14 21-55 C to +125 C Change of On-Resistance R ON 16 16 % from -V S to +V S Change of On-Resistance R ON / T.43.43 %/ C with Temperature R ON Match 2 2 % Between Switches Source Off I S(OFF) 5 1 5 1 pa V S = +/-4.V, V D = -/+4.V Leakage Current 5 pa C to +7 C 4 pa -55 C to +125 C Drain Off I D(OFF) 5 1 5 1 pa V D = +/-4.V, V S = -/+4.V Leakage Current 5 pa C to +7 C 4 pa -55 C to +125 C Channel On I D(ON) 5 1 5 1 pa Leakage Current 5 pa C to +7 C 4 pa -55 C to +125 C Input High Voltage V IH 4. 4. Logic "1" Input Low Voltage V IL.8.8 V Logic "" Input High or I IH Input Low Current I IL 1 1 na ±1.5 V SUPPLY ±5.V Supply Current I SUPPLY.1 1.1 1 µa ALD421/ALD422M Advanced Linear Devices 2
AC ELECTRICAL CHARACTERISTICS T A = 25 C V+ = +5.V, V- = -5.V, =.V unless otherwise specified 421/422M (PC) 421/422M (DC) 421/422M (SC) Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Unit Test Conditions Turn On t ON 15 24 15 24 15 24 ns 421 (Note 2) Delay time 6 11 6 11 6 11 ns 422M Turn Off t OFF 6 13 6 13 6 13 ns 421 (Note 2) Delay time 1 18 1 18 1 18 ns 422M Break-Before-Make t BD 2 9 2 9 2 9 ns 421 (Note 3) Delay Time Make-Before-Break t MD 15 4 15 4 15 4 ns 422M (Note 3) Delay Time Charge Injection Q INJ 2 5 2 5 1 2.5 pc 421 (Note 3) (Note 4) 1 2.5 1 2.5.7 2. pc 422M Off Isolation 75 75 75 db At f = 1KHz, (Note 5) Crosstalk 9 9 9 db At f = 1KHz, (Note 6) Total Harmonic T HD.5.5.5 % 1K Distortion.1.1.1 1K Source/Drain C S(OFF) Off Capacitance C D(OFF) 3. 3. 3. pf Channel On C DS(ON) 5.7 5.7 5.7 pf Capacitance Pin to Pin C PP.5.6.25 pf Capacitance DC ELECTRICAL CHARACTERISTICS T A = 25 C V+= +5.V, V- = =.V unless otherwise specified ALD421/422M (PC,SC) ALD421/422M (DC) Parameter Symbol Min Typ Max Min Typ Max Unit Test Conditions Analog Signal Range V A. +5.. +5. V On - Resistance R ON 195 28 195 28 Ω V A = +2.5V I A = 1mA 24 35 C to +7 C 27 39-55 C to +125 C Change of On-Resistance R ON 2 2 % from -V S to +V S Change of On-Resistance R ON / T.43.43 %/ C with Temperature R ON Match 2 2 % Between Switches Input High Voltage V IH 4. 4. V Input Low Voltage V IL.8.8 V Notes: 1. Voltage on any terminal must be less than (V+) +.3V and greater than (V-) -.3V, at all times including before power is applied and V+ = V- =.V. Vsupply power supply needs to be sequenced on first on power turn-on and sequenced off last during power turn-off. 2. See Switching Time Test Circuit. 3. Guaranteed by design. 4. See Charge Injection Test Circuit 5. See Off Isolation Test Circuit 6. See Crosstalk Test Circuit ALD421/ALD422M Advanced Linear Devices 3
DC ELECTRICAL CHARACTERISTICS T A = 25 C V+ = +3.V, V- = =.V unless otherwise specified 421/422M (PC,SC) 421/422M (DC) Parameter Symbol Min Typ Max Min Typ Max Unit Test Conditions Analog Signal Range V A. 3.. 3. V On - Resistance R ON 5 7 5 7 Ω V A = 1.5V I A = 1mA 62 88 C to +7 C 68 1-55 C to +125 C Change of On-Resistance R ON 43 43 % from -V S to +V S Change of On-Resistance R ON / T.27.27 %/ C with Temperature R ON Match Between Switches 2 2 % Input High Voltage V IH 2.4 2.4 V Input Low Voltage V IL.8.8 V TYPICAL PERFORMANCE CHARACTERISTICS 1. POWER DISSIPATION AS A FUNCTION OF FREQUENCY 24 ON RESISTANCE AS A FUNCTION OF SIGNAL VOLTAGE POWER DISSIPATION (mw).8.6.4.2 ON - RESISTANCE (Ω) 2 16 12 8 V SUPPLY = 1V 125 C 85 C 25 C -25 C -55 C 1 1 1 1 1 FREQUENCY (KHz) 4 2 4 6 8 1 SIGNAL VOLTAGE (V) 5 ON RESISTANCE AS A FUNCTION OF SIGNAL VOLTAGE 85 ON RESISTANCE AS A FUNCTION OF SIGNAL VOLTAGE ON - RESISTANCE (Ω) 4 3 125 C 2 85 C 25 C - 25 C - 55 C 1 1 2 3 4 5 ON - RESISTANCE (Ω) 7 55 V SUPPLY = 3V 125 C 4 85 C 25 25 C - 25 C - 55 C 1.6 1.2 1.8 2.4 3. SIGNAL VOLTAGE (V) SIGNAL VOLTAGE (V) ALD421/ALD422M Advanced Linear Devices 4
TYPICAL PERFORMANCE CHARACTERISTICS 2. SUPPLY CURRENT AS A FUNCTION OF INPUT VOLTAGE 1 SUPPLY CURRENT AS A FUNCTION OF INPUT VOLTAGE SUPPLY CURRENT (ma) 1.6 1.2.8.4 V SUPPLY = 1V SUPPLY CURRENT (µa) 8 6 4 2 2 4 6 8 1 INPUT VOLTAGE (V) 1 2 3 4 5 INPUT VOLTAGE (V) SUPPLY CURRENT (µa) 1 8 6 4 2 SUPPLY CURRENT AS A FUNCTION OF INPUT VOLTAGE V SUPPLY = 3V TOTAL HARMONIC DISTORTION(%) 1 1 1.1.1.1 TOTAL HARMONIC DISTORTION AS A FUNCTION OF FREQUENCY V S =.355 V RMS 1K 1K.6 1.2 1.8 2.4 3..1 1. 1 1 INPUT VOLTAGE (V) FREQUENCY (KHz) 5 SWITCH DELAY TIME AS A FUNCTION OF SUPPLY VOLTAGE 5 SWITCH DELAY TIME AS A FUNCTION OF SUPPLY VOLTAGE SWITCH DELAY TIME (ns) 4 3 2 1 ALD421 TURN ON DELAY TIME TURN OFF DELAY TIME SWITCH DELAY TIME (ns) 4 3 2 1 ALD422M TURN OFF DELAY TIME TURN ON DELAY TIME 3 4 5 6 7 8 9 1 3 4 5 6 7 8 9 1 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) ALD421/ALD422M Advanced Linear Devices 5
TEST CIRCUITS SWITCHING TIME TEST CIRCUIT CROSSTALK TEST CIRCUIT V S = 3V 1KHz 4.5V V RL = C L = 35pF Vi = 1Vrms 1KHz 5Ω S2 D2 C L = 15pF C L = 15pF t r = t f 2ns CCRR = 2 log [ /Vi ] 5% 5% 9% 1% TOTAL HARMONIC DISTORTION TEST CIRCUIT t on / t off toff / t on Vi = 1Vpp 1KHz 5Ω C L = 15pF CHARGE INJECTION TEST CIRCUIT OFF ISOLATION TEST CIRCUIT C L = 1pF 4.5V.5V 1KHz Vi = 1Vrms 1KHz 5Ω C L = 15pF Q = C L ALD421/ALD422M Advanced Linear Devices 6