Not Recommended for New Designs

Transcription

1 Not Recommended for New Designs The MAX99 was manufactured for Maxim by an outside wafer foundry using a process that is no longer available. It is not recommended for new designs. A Maxim replacement or an industry second-source may be available. The data sheet remains available for existing users. The other parts on the following data sheet are not affected. For further information, please see the Quickiew data sheet for this part or contact technical support for assistance.

2 9-9; Rev ; / Dual/Quad/Single, High-Speed, Ultra-Low-Power, General Description The MAX9/MAX98/MAX99 are dual/quad/single, high-speed, ultra-low-power voltage comparators designed for use in systems powered from a single + supply; the MAX99 also accepts dual ± supplies. Their ns propagation delay (with m input overdrive) is achieved with a power consumption of only.mw per comparator. The wide input commonmode range extends from m below ground (below the negative supply rail for the MAX99) to within. of the positive supply rail. Because they are micropower, high-speed comparators that operate from a single + supply and include built-in hysteresis, these devices replace a variety of older comparators in a wide range of applications. MAX9/MAX98/MAX99 outputs are TTL-compatible, requiring no external pullup circuitry. All inputs and outputs can be continuously shorted to either supply rail without damage. These easy-to-use comparators incorporate internal hysteresis to ensure clean output switching even when the devices are driven by a slow-moving input signal. The MAX99 features complementary outputs and an output latch. A separate supply pin for extending the analog input range down to - is also provided. The dual MAX9 and single MAX99 are available in 8-pin DIP and SO packages, and the quad MAX98 is available in -pin DIP and SO packages. These comparators are ideal for single +-supply applications that require the combination of high speed, precision, and ultra-low power dissipation. Battery-Powered Systems High-Speed A/D Converters High-Speed /F Converters Line Receivers Threshold Detectors/Discriminators High-Speed Sampling Circuits Zero-Crossing Detectors Applications TOP IEW OUTA INA+ OUTA INA+ + INB+ INC+ 9 INC- 8 OUTC INB- OUTB Pin Configurations MAX9 DIP/SO MAX98 8 INB+ + OUTB INB- INA- OUTD IND- IND+ INA- Features ns Propagation Delay µa (.mw) Supply Current per Comparator Single. to. Supply Operation (or ±, MAX99 only) Wide Input Range Includes Ground (or -, MAX99 only) Low, µ Offset oltage Internal Hysteresis Provides Clean Switching TTL-Compatible Outputs (Complementary on MAX99) Input and Output Short-Circuit Protection Internal Latch (MAX99 only) PART MAX9CPA MAX9CSA MAX9EPA MAX9ESA MAX9MSA/PR* Ordering Information TEMP RANGE C to + C C to + C - C to +8 C - C to +8 C - C to + C PIN-PACKAGE 8 Plastic DIP 8SO 8 Plastic DIP 8SO 8SO Ordering Information continued at end of data sheet. *Go to for details on high-reliability plastic processing. MAX9/MAX98/MAX99 DIP/SO Pin Configurations continued at end of data sheet. Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at , or visit Maxim s website at

3 MAX9/MAX98/MAX99 Dual/Quad/Single, High-Speed, Ultra-Low-Power, ABSOLUTE MAXIMUM RATINGS Positive Supply oltage (+ to )...+ Negative Supply oltage (- to, MAX99 only)...- Differential Input oltage MAX9/MAX to (+ +.) MAX99...(- -.) to (+ +.) Common-Mode Input oltage MAX9/MAX to (+ +.) MAX99...(- -.) to (+ +.) Latch Input oltage (MAX99 only)...-. to (+ +.) Input/Output Short-Circuit Duration to + or... Continuous ELECTRICAL CHARACTERISTICS (+ =, T A = + C; MAX99 only: - =, LATCH = ; unless otherwise noted.) Continuous Power Dissipation (T A = + C) 8-Pin Plastic DIP (derate 9.9mW/ C above + C)...mW 8-Pin SO (derate.88mw/ C above + C)... mw -Pin Plastic DIP (derate.mw/ C above + C)... 8mW -Pin SO (derate 8.mW/ C above + C)... mw Operating Temperature Ranges: MAX9_C... C to + C MAX9_E...- C to +8 C MAX9MSA/PR...- C to + C Storage Temperature Range...- C to + C Lead Temperature (soldering, s)... + C 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. PARAMETER Positive Trip Point Negative Trip Point Input Offset oltage Input Bias Current Input Offset Current Input oltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Output High oltage Output Low oltage Positive Supply Current per Comparator Negative Supply Current Power Dissipation per Comparator Output Rise Time Output Fall Time SYMBOL TRIP+ TRIP- OS I B I OS CMR CMRR PSRR OH OL I+ I- PD t r t f CONDITIONS (Note ) (Note ) (Note ) CM =, IN = OS CM =, IN = OS MAX9/MAX98/MAX99 (Notes, ) MAX99 only: - = - (Notes, ) (Notes, ) I SOURCE = µa I SINK =.ma I SINK = 8mA MAX9/MAX98 (Note ) MAX99 MAX99 only: - = - MAX9/MAX98 (Note 8) MAX99 OUT =. to., C L = pf OUT =. to., C L = pf MIN TYP MAX UNITS m m m na na µ/ µ/ ma µa mw ns ns

4 Dual/Quad/Single, High-Speed, Ultra-Low-Power, ELECTRICAL CHARACTERISTICS (continued) (+ =, T A = + C; MAX99 only: - =, LATCH = ; unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Propagation Delay t PD+, t PD- IN = m, OD = m (Note 9) ns Differential Propagation Delay t PD IN = m, OD = m (Note ) ns Propagation Delay Skew t PD skew MAX99 only: IN = m, OD = m (Note ) ns Latch Input oltage High IH (Note ). Latch Input oltage Low IL (Note ).8 Latch Input Current I IH, I IL (Note ) µa Latch Setup Time t s (Note ) ns Latch Hold Time t h (Note ) ns ELECTRICAL CHARACTERISTICS (+ =, T A = T MIN to T MAX ; MAX99 only: - =, LATCH = ; unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Positive Trip Point TRIP+ (Note ) m Negative Trip Point TRIP- (Note ) - - m Input Offset oltage OS (Note ). m Input Bias Current I B CM =, IN = OS na Input Offset Current I OS CM =, IN = OS na Input oltage Range CMR C/E temp. ranges MAX9/MAX98/MAX (Notes, ) MAX99 only, - = M temp. range MAX9/MAX98/MAX99 (Notes, ) MAX9MSA/PR Common-Mode Rejection Ratio CMRR (Notes, ) µ/ Power-Supply Rejection Ratio PSRR (Notes, ) µ/ Output High oltage OH I SOURCE = µa.8. Output Low oltage OL I SINK =.ma Positive Supply Current per Comparator I+ (Note ) T A = T MAX. T MIN = C. T MIN = - C. MAX9/MAX98.8. MAX99.. Negative Supply Current I- MAX99 only; - = - µ Power Dissipation per Comparator PD (Note 8) MAX9/MAX98 MAX99 ma mw

5 MAX9/MAX98/MAX99 Dual/Quad/Single, High-Speed, Ultra-Low-Power, ELECTRICAL CHARACTERISTICS (continued) (+ =, T A = T MIN to T MAX ; MAX99 only: - =, LATCH = ; unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Propagation Delay t PD+, t IN = m, OD = m PD- ns (Note 9) Differential Propagation Delay t IN = m, OD = m PD (Note ) ns Propagation Delay Skew t PD skew MAX99 only: IN = m, OD = m (Note ) ns Latch Input oltage High IH (Note ). Latch Input oltage Low IL (Note ).8 Latch Input Current I IH, I IL (Note ) µa Latch Setup Time t s (Note ) ns Latch Hold Time t h (Note ) ns Note : Trip Point is defined as the input voltage required to make the comparator output change state. The difference between upper ( TRIP +) and lower ( TRIP -) trip points is equal to the width of the input-referred hysteresis zone ( HYST ). Specified for an input common-mode voltage ( CM ) of (see Figure ). Note : Input Offset oltage is defined as the center of the input-referred hysteresis zone. Specified for CM = (see Figure ). Note : Inferred from the CMRR test. Note that a correct logic result is obtained at the output, provided that at least one input is within the CMR limits. Note also that either or both inputs can be driven to the upper or lower absolute maximum limit without damage to the part. Note : Tested with + =. (and - = for MAX99). MAX99 also tested over the full analog input range (i.e., with - = -.). Note : Tested over the full input voltage range ( CMR ). Note : Specified over the full tolerance of operating supply voltage: MAX9/MAX98 tested with. < + <.. MAX99 tested with. < + <. and with -. < - <. Note : Positive Supply Current specified with the worst-case condition of all outputs at logic low (MAX9/MAX98), and with + =.. Note 8: Typical power specified with + = ; maximum with + =. (and with - = -. for MAX99). Note 9: Due to difficulties in measuring propagation delay with m of overdrive in automatic test equipment, this parameter is guaranteed by design for the MAX9 and MAX98. Correlation tests show that the specification can be guaranteed if all other DC parameters are within the specified limits. OS must be added to the overdrive voltage for low values of overdrive. For the MAX99, propagation delay is typical only and there is no guaranteed maximum limit. Note : Differential Propagation Delay is specified as the difference between any two channels in the MAX9/MAX98 (both outputs making either a low-to-high or a high-to-low transition). Note : Propagation Delay Skew is specified as the difference between any single channel s output low-to-high transition () and high-to-low transition (), and also between the and transition on the MAX99. Note : Latch specifications apply to MAX99 only (see Figure ).

6 Dual/Quad/Single, High-Speed, Ultra-Low-Power, (+ =, T A = + C, unless otherwise noted.) PROPAGATION DELAY (ns) PROPAGATION DELAY (ns) PROPAGATION DELAY vs. OERDRIE R S = Ω C LOAD = pf OERDRIE (m) OD = m R S = Ω C LOAD = pf PROPAGATION DELAY MAX9 TOC MAX9 TOC PROPAGATION DELAY (ns) OH () OD = m C LOAD = pf PROPAGATION DELAY vs. SOURCE IMPEDANCE k k IN = m SOURCE IMPEDANCE (Ω) HIGH OLTAGE vs. SOURCE CURRENT T A = + C T A = + C T A = - C Typical Operating Characteristics MAX9 TOC MAX9 TOC PROPAGATION DELAY (ns) OL ().... OD = m R S = Ω PROPAGATION DELAY vs. CAPACITIE LOAD 8 IN = m T A = + C CAPACITIE LOAD (pf) LOW OLTAGE vs. SINK CURRENT T A = - C T A = + C MAX9 TOC MAX9 TOC MAX9/MAX98/MAX I SOURCE (µa). 8 I SINK (ma).. MAX9 TOTAL POSITIE SUPPLY CURRENT vs. POSITIE SUPPLY OLTAGE (S AT OL ) T A = + C MAX9 TOC.. MAX9 TOTAL POSITIE SUPPLY CURRENT vs. POSITIE SUPPLY OLTAGE (S AT OH ) T A = + C MAX9 TOC8.. MAX98 TOTAL POSITIE SUPPLY CURRENT vs. POSITIE SUPPLY OLTAGE (S AT OL ) T A = + C MAX9 TOC9 TOTAL I CC (ma). T A = + C T A = - C TOTAL I CC (ma). T A = + C T A = - C TOTAL I CC (ma). T A = + C T A = - C... 8 CC () 8 CC () 8 CC ()

7 MAX9/MAX98/MAX99 Dual/Quad/Single, High-Speed, Ultra-Low-Power, (+ =, T A = + C, unless otherwise noted.) TOTAL I CC (ma) OLTAGE RANGE () MAX98 TOTAL POSITIE SUPPLY CURRENT vs. POSITIE SUPPLY OLTAGE (S AT OH ) 8 CC () T A = + C T A = + C T A = - C OLTAGE RANGE CMR+ CMR MAX9 TOC MAX9 TOC TOTAL I+ (ma) OLTAGE RANGE () Typical Operating Characteristics (continued) MAX99 POSITIE SUPPLY CURRENT vs. POSITIE SUPPLY OLTAGE - = - T A = + C T A = + C T A = - C 8 + () MAX99 OLTAGE RANGE CMR + CMR = + - = - MAX9 TOC MAX9 TOC TOTAL I- (µa) SHORT-CIRCUIT CURRENT (ma) MAX99 NEGATIE SUPPLY CURRENT vs. NEGATIE SUPPLY OLTAGE + = + T A = + C T A = + C T A = - C () SHORT-CIRCUIT CURRENT SHORTED TO + (SINKING) SHORTED TO (SOURCING) MAX9 TOC MAX9 TOC OS (m). OUT =. CM = OFFSET OLTAGE MAX9 TOC CURRENT (na) CM = IN = OS BIAS CURRENT MAX9 TOC OS (m) - CM = TRIP POINT TRIP+ TRIP- MAX9 TOC

8 Dual/Quad/Single, High-Speed, Ultra-Low-Power, (+ =, T A = + C, unless otherwise noted.) m/div m/div MAX9/MAX98 PROPAGATION DELAY () (m OERDRIE) ns/div MAX9 TOC9 MAX99 PROPAGATION DELAY () (m OERDRIE) MAX9 TOC Typical Operating Characteristics (continued) m OERDRIE m/div TTL THRESHOLD (.) m OERDRIE /div m/div m/div MAX9/MAX98 PROPAGATION DELAY () (m OERDRIE) ns/div MAX99 PROPAGATION DELAY () (m OERDRIE) MAX9 TOC MAX9 TOC -m OERDRIE m/div TTL THRESHOLD (.) -m OERDRIE /div MAX9/MAX98/MAX99.. t PD SKEW t PD SKEW ns/div ns/div RESPONSE TO MHz SINE WAE m P-P MHz SINE WAE COMPARATOR MAX9 TOC /div ns/div

9 MAX9/MAX98/MAX99 Dual/Quad/Single, High-Speed, Ultra-Low-Power, MAX9 8 PIN MAX MAX99 NAME OUTA INB- INA- INA+ INB+ IND- OUTB + OUTC INC- INC+ IND+ IN- OUTD IN+ - Comparator A Output Comparator A Inverting Input Comparator A Noninverting Input Ground Comparator B Noninverting Input Comparator B Inverting Input Comparator B Output Positive Supply Comparator C Output Comparator C Inverting Input Comparator C Noninverting Input Comparator D Noninverting Input Comparator D Inverting Input Comparator D Output Noninverting Input Inverting Input Negative Supply or Ground FUNCTION Pin Description LE The latch is transparent when LE is low. The comparator output is stored when LE is high. 8 Comparator Output Inverted Comparator Output Detailed Description Timing Noise or undesired parasitic AC feedback cause most high-speed comparators to oscillate in the linear region (i.e., when the voltage on one input is at or near the voltage on the other input). The MAX9/MAX98/ MAX99 eliminate this problem by incorporating internal hysteresis. When the two comparator input voltages are equal, hysteresis effectively causes one comparator input voltage to move quickly past the other, thus taking the input out of the region where oscillation occurs. Standard comparators require that hysteresis be added through the use of external resistors. The MAX9/MAX98/MAX99 s fixed internal hysteresis eliminates these resistors (and the equations required to determine appropriate values). Adding hysteresis to a comparator creates two trip points: one for the input voltage rising and one for the input voltage falling (Figure ). The difference between these two input-referred trip points is the hysteresis. Figure illustrates the case where IN- is fixed and IN+ is varied. If the inputs were reversed, the figure would look the same, except the output would be inverted. The MAX99 includes an internal latch, allowing the result of a comparison to be stored. If LE is low, the latch is transparent (i.e., the comparator operates as though the latch is not present). The state of the comparator output is stored when LE is high (Figure ). Note that the MAX99 can be operated with - connected to ground or to a negative supply voltage. The MAX99 s input range extends from (- -.) to (+ -.). 8

10 Dual/Quad/Single, High-Speed, Ultra-Low-Power, TRIP+ HYST TRIP- COMPARATOR IN+ TRIP+ + TRIP- OS = IN- = Applications Information Circuit Layout Because of the MAX9/MAX98/MAX99 s high gain bandwidth, special precautions must be taken to realize the full high-speed capability. A printed circuit board with a good, low-inductance ground plane is mandatory. Place the decoupling capacitor (a.µf ceramic capacitor is a good choice) as close to + as possible. Pay close attention to the decoupling capacitor s bandwidth, keeping leads short. Short lead lengths on the inputs and outputs are also essential to avoid unwanted parasitic feedback around the comparators. Solder the device directly to the printed circuit board instead of using a socket. Overdriving the Inputs The inputs to the MAX9/MAX98/MAX99 may be driven beyond the voltage limits given in the Absolute Maximum Ratings, as long as the current flowing into the device is limited to ma. However, if the inputs are overdriven, the output may be inverted. The addition of an external diode prevents this inversion by limiting the input voltage to m to m below ground (Figure ). OH Figure. Input and Output Waveforms, Noninverting Input aried OL LE DIFFERENTIAL OLTAGE () (). COMPARE t s OS OH. OL OH. OL OD IN t h LATCH Figure. MAX99 Timing Diagram t SKEW Battery-Operated Infrared Data Link Figure 's circuit allows reception of infrared data. The MAX converts the photodiode current to a voltage, and the MAX9 determines whether the amplifier output is high enough to be called a. The current consumption of this circuit is minimal: The MAX and MAX9 require typically µa and µa, respectively. MAX9/MAX98/MAX99 9

11 Single/Dual/Quad, High-Speed, Ultra-Low-Power, MAX9/MAX98/MAX99 CLAMP = -m TO -m / MAX9 I SRC - Figure. Schottky Clamp for Input Driven Below Ground Pin Configurations (continued) TOP IEW + MAX99 8 IN+ IN- - LE DIP/SO SIEMENS BP- PHOTODIODE kω pf MAX pf MΩ kω pf + kω +.µf + 8.µF DATA MAX9 Figure. Battery-Operated Infrared Data Link Consumes Only ma Ordering Information (continued) PART TEMP RANGE PIN-PACKAGE MAX98CPD C to + C Plastic DIP MAX98CSD C to + C SO MAX98EPD - C to +8 C Plastic DIP MAX98ESD - C to +8 C SO MAX99CPA C to + C 8 Plastic DIP MAX99CSA C to + C 8 SO MAX99EPA - C to +8 C 8 Plastic DIP MAX99ESA - C to +8 C 8 SO MAX9 TRANSISTOR COUNT: MAX98 TRANSISTOR COUNT: MAX99 TRANSISTOR COUNT: PROCESS: Bipolar Chip Information 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. Maxim Integrated Products, San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.