Phase-Reversal Analog Switches General Description Features The MAX4526/MAX4527 are CMOS analog ICs config- ured as phase-reversal switches. The MAX4526 is optimized for high-speed applications, such as chop- per amplifiers, while the MAX4527 is optimized for low-power applications. The MAX4526/MAX4527 operate from a +4.5V to +36V single supply or +4.5V to +1BV dual supplies. On-resis- Rail-to-Rail Signal Handling tance (175] max) is matched between switches to 8Q maximum, Each switch can handle rail-to-rail analog Transition Time < 100ns with 15V Supplies signals. Maximum leakage current is only 0.5nA at # ipA Current Consumption (MAX4527) +25C and 10nA at +85C. + >2kV ESD Protection per Method 3015.7 All digital inputs have 0.8V to 2.4V logic threshalds, ensuring TTLICMOS-logic compatibility. TTL/CMOS-Compatibie inputs + Available in Small, 8-Pin pMAX Package # 10pC (max) Charge Injection * 2pC (max) Charge-injection Match # 1752 Signal Paths with +15V Supplies Guaranteed Break-Before-Make + Ordering information Applications PART TEMP.RANGE _PIN-PACKAGE Ch Stabilized Ampiil MAX4526CPA OC to +70C 8 Plastic DIP opper-Stabilized Amplitiers MAX4526CSA OCto+70C -BSO Balanced Modulators/Demodulators MAX4526CUA 0C to +70C 8 MAX Data Acquisition MAX4526C/D OC to +70C Dice* Test Equipment MAX4526EPA _-40C to +85C 8 Plastic DIP ows MAX4526ESA __--40C to + 85C 8S0 Audio-Signal Routing MAX4526EUA 40C to +85C_ BMAX Ordering Information continued at end of data sheet. *Contact factory for availability. Pin Configuration/Functional Diagram/Truth Table PAAXLIA TOP VIEW hive a | a) ve i 8 yo TT eno [3] ee 6] Y w > DIP/SO/uMAX . Atl SWITCH POSITIONS SHOWN WITH IN = LOW MAAXLAA Maxim integrated Products 1-21 For free samples & the latest literature: http:/www.maxim-ic.com, or phone 1-800-998-8800 For small orders, phone 408-737-7600 ext. 3468. LESUXVIN/9ZSPXVANMAX4526/MAX4527 Phase-Reversal Analog Switches ABSOLUTE MAXIMUM RATINGS (Voltages Referanced to GND) -O.3V to +44V -25V to +0.3V -0.3V to +44V All Other Pins (Note 1) we 0.3V) to (V4 + 0.3V) Continuous Current into Any Terminal... ee +20MA Continuous Power Dissipation (Ta = +70C) Plastic DIP (derate 9.09mMW/C above +70C) oo... 727mW SO (derate 5.88mMW/C above +70C) MAX (derate 4. 1mW/C above +70C)} Operating Temperature Ranges Peak Current into Any Terminal MAX4E2_ CAL teceteee eer eseceenenenecsseseacencesseans OC to +70C (pulsed at ims, 10% duty cycle)... eee +30MA MAX452_E Aw. 40C to +85C ESD per Method 3016.7 ooo. reece treneeteeacnseeses >2000V Storage Temperature Range........ -65C to +150C Lead Ternperature (soldering, 10sec)... +300C Note 1: Signals on IN, A, B, X, or exceeding V+ or V- are clamped by internal diodes. Limit forward-diode current to maximum current rating. 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 CHARACTERISTICSz15V Supplies (V+ = +15V, V- = -15V, Vind = 2.4V, ViNL = O.8V, Ta = TMIN to Tyax, uniess otherwise noted. Typical values are at Ta = +25C.) PARAMETER SYMBOL CONDITIONS ta | MIN (note 2) MAX | units ANALOG SWITCH Analag-Signal Range vei B (Note 3) C,E Vv Va Vv A-X, A-Y, B-X, B-Y R Va = Vp = 10V, +25C 105 175 2 On-Resistance ON lazla=imA CE 200 A-X, A-Y, B-X, BY AR Va = Vg = 10V, +26C 0.5 8 Q On-Resistance Match (Note 4) ON la=lp= imA C.E 10 A-X, A-Y, B-X, B-Y Va = Ve = -5V. OV, +5V; +25C 12 18 Q On-Resistance Flatness (Note 5) RELATION) | ja = Ip = 1mA CE 30 INOFF) V+ = 16.5V, V- = -16.5V: +25C | -0.5 0.04 0.5 A,B, X, Y Leakage Current (Note 6) ore VIN = OV, 3V; nA WORE Vaz #15.5V.Vg=2155V |] ce | -to 10 LOGIC INPUT IN Input Logic Threshald High VINH c,E 16 2.4 Vv IN Input Logic Threshold Low VINL CLE 0.8 16 IN Input Current Logic High or Low link, lint | Vine = 0.8V or 2.4V CE 1 0.03 1 yA 1-22 MAXLAAPhase-Reversal Analog Switches ELECTRICAL CHARACTERISTICS+15V Supplies (continued) (V+ = +15V, V- = -15V, Vino = 2.4V, VINL = 0.8V, Ta = TMIN to TMAx, unless otherwise noted. Typical values are at Ta = +25C.) PARAMETER SYMBOL CONDITIONS Ta MIN (Note. 2) MAX UNITS SWITCH DYNAMIC CHARACTERISTICS Va=Ve= stv. | maxaseg 728C 100 Transition Ti V+ = 15V, C,E 125 ransition Time TRANS | yo -15V BC 05 500 ns 7B -HOV, + Fi MAX4527 igure 3 CE 250 Break-Before-Make Time Delay BBM BV. Eigure ye = 18V.) J o5eG 1 5 ns Charge Injection (Note 3) Q Re : 00 Figues = OV, +26C 1 10 ec A-X, AY, B-X, B-Y Capacitance CoFF Faure s GND, f= IMH2. | 5506 13 oF yA XY RB. : AL = 500, Cy = 15pF, An A-Y, B-X, B-Y Isolation Viso Va = Ve = 1Vems, 425C 65 cB (Note 7) f = 1MHz, Figure 7 POWER SUPPLY Power-Supply Range Ve, V- CLE 44.5 +20 Vv MAX4526 vesre o7 ' A m V+ Supply Current I+ V+ = 16.5V, GE s VIN = OV or V+ MAX4527 +25C 0.05 1 A CE 10 0 MAX4526 +26C | -400 CLE -600 V- Supply Current i- Y- = -16.5V uA MAX4527 +26C ~1 0.05 C,E -{ Note 2: The algebraic corvention is used in this data sheet; the most negative value is shown in the minimum column. Note 3: Guaranteed by design. Note 4: ARon = ARON@MAX) ~ ARON(MIN). Note 5: Resistance flatness is defined as the difference between the maximum and minimum values of on-resistance as measured aver the specified analog-signal range. Note 6: Leakage current is 100% tested at maximum rated hot temperature, and is quaranteed by correlation at Ta = +25C and minimum rated cold temperature. Note 7: Off-isolation = 20log10 [(Vx or Vy) / (Va or VB)], Vx or Vy = output, Va or VB = input to off switch. PAAXIAA 4-23 LESUXVW/9ESPXVINMAX4526/MAX4527 Phase-Reversal Analog Switches Typical Operating Characteristics (V+ = +15V, V- = -15V, GND = OV, Ta = +25C, unless otherwise noted.) ON-RESISTANCE vs. ON-RESISTANCE vs. Va, Ve Va. Vo, AND TEMPERATURE ON-RESISTANCE vs. Va, Ve (DUAL SUPPLES) (DUAL SUPPLIES} (SINGLE SUPPLY) 10,000 Tast = 485C V2 0 $ & 1000 e & Vex 410V +t Ty 58C Tas 40C ~The Ta 425C Vow +15V Veen Vee H15V Vow 00 16 42 8 4 0 4 8 12 16 0 2 4 6 B 10 12 14 6 18 20 Va, Vp () Va, Va () ON-RESISTANCE vs. Va, Ve, AND TEMPERATURE CHARGE INJECTION, CHARGE- (SINGLE SUPPLY) LEAKAGE vs. TEMPERATURE HAJECTION MATCHING vs. Va, Ve 300 90 . Taz Tae Vea 15V 5 V+ = 15V 1 : 960 Ve a -15V oo je tY i i 200 10 3 ~} 2 = 150 | 2 oc . AQ MATCHING 100 = 40C 40 Tax PC "| i s , ra Veo BV = 25"G UV A) lL Vea 0V : 0 001 -30 0 2 4 6 & 0 12 1 16 $5 35-15 5 25 45 65 85 105 125 18-0 5 OF 5 0 4% Va, Va (4) TEMPERATURE (C) Va ve (W) CHARGE INJECTION, CHARGE-INJECTION MATCHING vs. Va, Vp TRANSITION TIME (SINGLE SUPPLY) vs, SUPPLY VOLTAGE TRANSITION TIME vs. TEMPERATURE 16 7 450 3 300 rot 2 g Ve = 15V Ve = 15V 400 5 Wee -18V V-= OV j i 360 10 Oyo Vy 300 200 = Ww 2 exp 2 3 4 2 150 Ss ; AT) be 3 LA xp 450 MAX4527 100 0 |_| | L_ 100 50 MATCHING AG 50 4 0 0 - 0 2 4 6 8 0 12 4 16 02 4 6 A 1 1 t4 16 18 20 65-35-15 5 25 45 65 85 105 125 Va. Ve (4) V4, Ve {V) TEMPERATURE (C) 1-24 MAXIMAPhase-Reversal Analog Switches Typical Operating Characteristics (continued) (V+ = +15V, V- = -15V, GND = OV, Ta = +25C, unless otherwise noted.) MAX4526 MANG527 SUPPLY CURRENT vs. TEMPERATURE POSITIVE SUPPLY CURRENT vs. Vix POSITIVE SUPPLY CURRENT vs. Vin 200 1000 1000 3s 18 900 i 150 80 " Ve= 15V ; 17 700 Ve= 15 Ve = BV Vem -15V 10 1.25 _ 600 _ = 1.00 3 50 3 * 75 + (MAXA526) 400 500 re) _ 20 oat 0.25 100 0 Q 0.001 5-35-15 5 25 45 @ 85 105 125 02 4 6 8 2 4 6 0 2 4 6 &@ 0 12 4 46 TEMPERATURE /C) Vin V} vin) MAX4526 TOTAL HARMONIC DISTORTION FREQUENCY RESPONSE vs. FREQUENCY 100 * a Va = 15V 8 -10 60002 IN AND OUT| j % 10 -30 @ z 8 -50 1 = 60 5 Tt i -70 | TT a oA = 90 c SH 100 oot TC SCO rr ' 10 100 = 1000 10 100 1k 10k 100k FREQUENCY (MH2} FREQUENCY (H2) PRAAXLAA 4-25 LESPXVW/9ESPXUWMAX4526/MAX4527 Phase-Reversal Analog Switches Pin Configuration PIN NAME FUNCTION Analog-Switch Input Terminal A. Connected to Y when IN is low; con- nected to X when IN is high. Analog-Switch Input Terminal B. Connected to X when IN is low; con- nected to Y when IN is high. Ground. Connect GND to digital ground. (Analog signals have no ground reference; they are limited to V+ and V-.) 3 GND IN Logic-Levei Control Inputs (see Truth Table). Negative Analog Supply-Voltage Input. Connect V- to GND for single- supply operation. 6 Y Analog-Switch Output Terminal Y. Analog-Switch Output Terminal X. Positive Analog/Digital Supply-Voltage Input. Internally connected to sub- strate. 8 V+ Note: A, B, X and Y pins are identical and interchangeable. Either may be considered as an input or output, signals pass equaily well in either direction. However, AC symmetry is best when A and 8 are the input; and X and Y are the output. Reduce AC balance in critical applications by using A and X or A and Y as the input, and B and Y or B and X as the output. Detailed Description The MAX4526/MAX4527 are phase-reversal analog switches, consisting of two normally open and two nor- mally closed CMOS analog switches arranged in a bridge configuration. Analog signals are put into two input pins and taken out of two output pins. A logic- level signal controls whether the input signal is routed through normally or inverted. A low-resistance DC path goes from inputs to outputs at all times, yet isolation between the two signal paths is excellent. Analog sig- nals range from V- to V+. These parts are characterized and optimized with +15V supplies, and they can operate from a single supply. The MAX4526 is optimized for high-frequency opera- tion, and has a higher-speed logic-level transiator and switch driver. The MAX4527 has identical analog switch characteristics, but has a slower logic-level translator and switch driver for lower current consumption. The MAX4526/MAX4527 are designed for DC and low- frequency-signal phase-reversal applications, such as chopper amplifiers, modulator/demodulators, and self- zeroing or seif-calibrating circuits. Unlike conventional CMOS switches externally wired in a bridge configura- tion, both DC and AC symmetry are optimized with a small 8-pin configuration that allows simple board lay- out and isolation of logic signals fram analog signals. ve MAXLM | MAX4526 MAX4527 nS A Ve INPUTS 3 ls * Ix OP a y QUTPUTS i oN LosicLo 1: GND v- to ve MAXIAA | MAX4526 MAX4527 AS A Ve INPUTS , ay x AS | _! ouTPUTS u sn Logic Hi ~J Hs! Figure f. Typical Application Circuits 1-26 PMAAXIIAPhase-Reversal Analog Switches Power-Supply Considerations Overview The MAX4526/MAX4527 construction is typical of most CMOS analog switches. it has three supply pins: V+, V-, and GND. V+ and V- drive the internal CMOS switches and set the analog-voltage limits on any switch. Reverse ESD-protection diodes are internally connect- ed between each analog signal pin, and both V+ and V-. One of these diodes conducts if any analog signal exceeds V+ or V-. Virtually all of the analog leakage current is through the ESD diodes to V+ or V-. Although the ESD diodes on a given signal pin are identical and therefore fairly well balanced, they are reverse biased differently. Each is biased by either V+ or V- and the analog signal. This means their leakages vary as the signal varies. The aif- ference in the two diode leakages from the signal path to the V+ and V- pins constitutes the analog-signal-path leakage current. All analog leakage current flows to the supply terminals, not to the other switch terminal. This explains how both sides of a given switch can show leakage currents of either the same or opposite polarity. There is no connection between the analog-signal paths and GND. The analog-signal paths consist of an N- channel and P-channel MOSFET with their sources and drains paralleled and their gates driven out-of-phase to V+ and V- by the logic-leve! translators. V+ and GND power the internal logic and logic-ievel translator and set the input logic threshold. The logic- level translator converts the logic levels to switched V+ and V- signals to drive the analog switches gates. This drive signal is the only connection between GND and the analog supplies. V+ and V- have ESD-protection diodes to GND. The logic-level input has ESD protec- tion to V+ and to V- but not to GND, so the logic signal can go below GND (as low as V-) when bipolar sup- plies are used. Increasing V- has no effect on the logic-level thresholds, but it does increase the drive to the internal P-channel switches, reducing the overall switch on-resistance. V- also sets the negative limit of the analog-signal voltage. The logic-fevel input pin, IN, has ESD-protection diodes to V+ and V- but not to GND, so if can be safely driven to V+ and V-. The logic-level threshold, Vin, is CMOS/ TTL compatible when V+ is between 4.5V and 36V (see Typical Operating Characteristics). MAAXLMM Bipolar Supplies The MAX4526/MAX4527 operate with bipolar supplies between +4.5V and +18V. However, since all factory characterization is done with +15V supplies, specifica- tions at other supplies are not guaranteed. The V+ and V- supplies need not be symmetrical, but their sum cannot exceed the absolute maximum rating of 44V (see Absolute Maximum Ratings). MODULATOR/DEMODULATOR CIRCUIT Ve | UM V+ INPUT y A yy OUTPUT The =e Ni =n = = || 42 5ex MAXIM LOGIC (CARRIER) | MAX4526 = Vs MAX4527 TIME WAVEFORMS OUTPUT SPECTRUM LOWER UPPER SIDEBAND SIDEBAND \\ | SUPPRESSED CARRIER \ LOGIC {CARRIER) AL voN LON FREQUENCY y Ah. aon WP HY {OUTPUT) r_ Figure 2, Balanced Modulator/Demodviator 1-27 LESPXVIN/9ZSPXVWMAX4526/MAX4527 Phase-Reversal Analog Switches Single Supply The MAX4526/MAX4527 operate from a single supply between +4.5V and +36V when V- is connected to GND. Observe all of the bipolar precautions when operating from a single supply. Applications information The MAX4526/MAX4527 are designed for DC and tow-frequency-signal phase-reversal applications. Both DC and AC symmetry are optimized for use with +15V supplies. Signal Phase/Polarity Reversal The- MAX4526/MAX4527 can reverse the phase or polarity of a pair of signals that are out-of-phase and balanced to ground. This is done by routing signals through the MAX4526/MAX4527 and under controi of the IN pin, reversing the two signals paths inside the switch before sending out to a balanced output. Figure 1 shows a typical example. The MAX4526/MAX4527 cannot reverse the phase or polarity of a single- grounded signal, as can be done with an inverting op amp or transformer. Balanced Modulators/Demodulators The MAX4526/MAX4527 can be used as a balanced modulator/demodulator at carrier frequencies up to 100kHz (Figure 2). Higher frequencies are possible, but as frequency increases, small imbalances in the MAX4526/MAX4527's internal capacitance and resis- tance gradually impair performance. Similarly, imbai- ances in external circuit capacitance and resistance to GND reduce overall carrier suppression. The carrier is applied as a logic-level square wave to IN. (Note that this voltage can go as negative as V-.) For best carrier suppression, the power-supply voit- ages should be equal, the square wave should have a precise 50% duty cycle, and both the input and output signals should be symmetrical about ground. Bypass V+ and V- to GND with 0.1pF ceramic capacitors, as close to the IC pins as possible. Since the logic-levei translator/driver in the MAX4526 is faster than the one in the MAX4527, it gives better results at higher frequencies. In critical applications, carrier suppression can be optimized by trimming duty cycle, DC bias around GND, or external source and load capacitance. In signal lines, balancing both capacitance and resis- tance to GND produces the best carrier suppression. Transformer coupling of input and output signals provides the best isolation and carrier suppression. Transformers can also provide signal filtering, imped- ance maiching, or low-noise voltage gain. Use a center-tapped transformer or high-resistance voltage divider to provide a DC path te GND on either the input signal or output signal. This ensures a DC path to GND and symmetrical operation of the internal switches. Test Circuits/Timing Diagrams V- 1S CONNECTED TO GND (OV) FOR SINGLE-SUPPLY OPERATION. vi wal ve at- -tov san] AAAXLAA Maree +10 MAX4527 = x Vout GND. 3000 L- 35pF V+ y \ 50% bE Vin w / L Ve Vor 90% Va trrans E sox = trans Figure 3. Address Transition Time 1-28 MAAXLMPhase-Reversal Analog Switches Test Circuits/Timing Diagrams (continued) Vin 50 = A +10V MAXIM | V- 1S CONNECTED 10 GND (OV) FOR SINGLE-SUPPLY OPERATION fe < Sns Ve ta < 5ns Vin fas \. ov VOUT nemo 7 90% Ov eBM _ Figure 4. Break-Before-Make Interval Vy; 50 2 Vt a IN Va BORA F- NE. AORB VaR Va AAAXLIAA | MAX4526 MAX4527 XORY ->e_ Vour v- a o GND 4 | TL 1000pF \- V- 1S CONNECTED TO GND (OV) FOR SINGLE-SUPPLY OPERATION. Ve " fo XK ov Yosr So AVout iS THE MEASURED VOLTAGE QUE TO CHARGE TRANSFER ERROR G WHEN THE CHANNEL TURNS OFF. Q = AVou7 xO, Figure 5. Charge Injection MAAXIMA 1-29 LOSPXVIN/9CSPXVINMAX4526/MAX4527 Phase-Reversal Analog Switches Test Circuits/Timing Diagrams (continued) V+ | Ve Aro MAMIAA BL/o V+ MAX4526 x 4 MAxd527 = Xo = SWITCH IN Y O~tO CY CAPACITANCE! SELECT SND Ve tT ANALYZER =~ Lf = V- = Figure 6. A, B, X, Capacitance V+ 40nF = NETWORK ANALYZER vost Ve AB che OFF ISOLATION = 20 fog OUT ANAXLM rT 500 500 t Maxaeor ON<085 = 201g YOUE MAX4527 = cas act Vi IN XY fo ST ~ fT SWITCH ono \ = SELECT _L - co sea tt ~ e = = = Ve = = MEASUREMENTS ARE STANDARDIZED AGAINST SHOAT AT SOCKET TERMINALS. OFF ISOLATION IS MEASURED BETWEEN A, B AND OFF X, Y TERMINAL. ON LOSS IS MEASURED BETWEEN A, B AND ON X, TERMINAL. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED. V- iS CONNECTED TO GND (OV) FOR SINGLE-SUPPLY OPERATION. Figure 7. Off Isolation and On Loss 1-30 PAAXLIAPhase-Reversal Analog Switches _Ordering Information (continued) Chip Topography PART TEMP.RANGE _PIN-PACKAGE A MAX4527CPA OC to+70C _8 Plastic DIP MAX4527CSA OC to +70C 8S0 A MAX4527CUA OC to +70C 8 UMAX MAX4527C/D 0C to +70C Dice* MAX4527EPA -40C to +85C 8 Plastic DIP __f on MAX4527ESA _-40C to 485C B SO ; ; 77" MAX4527EUA -40C to +85C_ 8 UMAX B ee Y i.96mm *Contact factory for availability. GND 0.058" (1.47mm) TRANSISTOR COUNT: 50 SUBSTRATE {8 INTERNALLY CONNECTED TO V+ SA ARKIAA 1-31 LESPXVIN/9CSPXVIN