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| ADVANCED LINEAR DEVICES, INC. ALD2321A/ALD2321B ALD2321 ULTRA LOW VOS EPAD(R) DUAL CMOS ANALOG VOLTAGE COMPARATOR GENERAL DESCRIPTION The ALD2321A/ ALD2321B/ ALD2321 is a monolithic Precision Dual Voltage Comparator, each having integrated dual complementary output drivers. It is constructed using advanced silicon gate CMOS technology. Key features of the ALD2321A/ ALD2321B/ ALD2321 include very high input impedance, very low offset voltage utilizing onchip e-trim (EPAD(R) electronic-trimming) technology, flexible multiple output configurations and fast response time with small overdrive voltage. It is designed for ultra low level signal detection from high impedance sources. For many applications the ALD2321A/ ALD2321B/ ALD2321 can eliminate an input amplification stage, a precision input bias stage, a signal level shift stage and an output buffer stage, and do the entire job from low level input signal detection to high output driver ---- all on a single chip. The input voltage includes ground, making this voltage comparator ideal for single supply +5V or dual supply +/- 5V powered systems. For dual supply applications, GND pin is connected to the most negative supply instead of Ground (0.0V). The negative supply voltage can be at any value between 0.0V and -5V. Each voltage comparator is individually trimmed at the factory for minimum offset voltage at ground voltage potential, making the ALD2321A/ ALD2321B/ ALD2321 at its best offset voltage and ready to compare very low signal level voltages at or near ground potential. Typically a signal less than 1 mV can be resolved and detected reliably without requiring amplification. Sensor or detector signals with signal power as low as 0.004 pW(4 x 10-15 Watt) can be readily detected. Each voltage comparator has two complementary output pins, one for Source Output (OUTH)and the other for Sink Output (OUT). This dual complementary output allows maximum circuit design flexibility. The outputs can be used as Single-Ended Driver, Multiple WIRED-OR Outputs, Push-Pull Outputs or Complementary Outputs. The Sink Output can be used as an open drain output, which has current sink capability of up to 50 mA. It can also be connected to an external voltage higher or lower than V+, which provide level shift of the output swing levels from other than V+ to GND. ORDERING INFORMATION Operating Temperature Range* 0C to +70C 16-pin Small Outline Package (SOIC) ALD2321ASC ALD2321BSC ALD2321SC 0C to +70C 16-Pin Plastic DIP Package (PDIP) ALD2321APC ALD2321BPC ALD2321PC -55C to +125C 16-Pin Ceramic DIP Package (CDIP) ALD2321ADC ALD2321BDC ALD2321DC PRODUCT FEATURES * Ultra low signal power of 4 fW detectable * Ultra low offset voltage of max. 0.2 mV * Ultra low input bias currents of typ. 0.01pA * Low supply current of 110 A typical * Virtually eliminates source impedance effects * Low operating supply voltage of 3V to 10V * Single +5V and dual supply 5V operation * High speed for both small and large level signals 300ns typical for TTL inputs * CMOS, NMOS and TTL compatible * Each comparator has separate push and pull outputs * High output sink current - typically 50mA * Low supply current spikes * Fanout of 30 TTL loads APPLICATIONS * Low level signal detector * Dual limit window comparator * Power supply voltage monitor * Photo-detector sensor circuit * Relay or LED driver * Oscillators * Battery operated instruments * Remote signal detection PIN CONFIGURATION OUT1 OUT1H -IN1 +IN1 GND VE11 VE12 N/C* 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 V+ OUT2 OUT2H -IN2 +IN2 VE21 VE22 N/C* DC, PC, SC PACKAGE * *N/C pins are connected internally. Do not connect externally. * Contact factory for industrial temperature range (c) 2004 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com GENERAL DESCRIPTION (cont'd) The Source Output can source up to 2 mA and can be used to drive the base terminal of an external NPN bipolar device or the gate of a N-channel MOSFET device. Alternatively, the two outputs, Source Output and Sink Output, can be connected together to form a push-pull output which has the combined output capabilities of both channels. In the dual complementary output mode, each comparator can be used to drive separate loads. Due to the complementary nature of the two outputs, only one output is active at any a given time, except for a limited crossover time. When OUT (sink output) is active ON, the OUT pin is sinking current and the OUTH pin is OFF and in high impedance mode. Conversely, if OUTH pin is ON and sourcing current, OUT pin is OFF. To configure push-pull output, simply connect OUT (sink output) pin to OUTH pin. Since each voltage comparator has its own complementary outputs, each comparator can be configured to have a different output type. For example, one comparator output can be connected as Open Drain output while the other comparator can be wired as push-pull output. If used to drive capacitive loads, the output DC current levels are at a very low level, at essentially leakage current levels, which can be a power saving feature. The ALD2321A/ ALD2321B/ ALD2321 can detect and resolve very low voltage levels at high speed, with little or no overdrive voltage. Compared with other voltage comparator devices that require 100 mV overdrive voltages, or multiple stage circuits that include input preamp, etc., the ALD2321A/ ALD2321B/ ALD2321 can perform all input to output functions in one device with minimal delay time and with as low as a 1mV signal. The ALD2321A/ ALD2321B/ ALD2321 is supplied with 4 external e-trim pins, VE11, VE12, VE21 and VE22. These pins are used for trimming of the voltage comparator offset voltages ALD2321 PIN IDENTIFICATION PIN # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SYMBOL OUT1 OUT1H -IN1 +IN1 GND VE11 VE12 N/C N/C VE22 VE21 +IN2 -IN2 OUT2H OUT2 V+ FUNCTION at the factory, and normally should be left open unconnected. However, in some cases these pins can be used as positive/ negative feedback pins, since these pins have a positive/ negative factor on the offset voltage. For example, see TYPICAL APPLICATIONS section titled "Voltage Comparator With Output Feedback to Provide Hysteresis." In printed circuit board layout, it is suggested that these pins, along with no connect (N/C) pins 8 and 9, be surrounded with ground traces to prevent any possible crosstalk and noise coupling from other signal sources. Although not required for most applications, if necessary, small valued capacitors of approximately 1000 pF can be mounted at these pins to ground to further reduce noise. For information on customized trimming under different biasing and power supply conditions, please contact factory. BLOCK DIAGRAM (16) V+ INVERTING INPUT -IN 1 (3) NONINVERTING INPUT +IN 1 (4) (2) OUT1H (1) OUT1 + (7) VE12 (6) VE11 (5) GND INVERTING INPUT -IN 2 (13) NONINVERTING INPUT +IN 2 (12) + (10) VE22 (11) VE21 (14) OUT2H (15) OUT2 (8) N/C (9) N/C SIGNAL PROPAGATION OUTPUT OUTPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT OUTPUT OUTPUT 2 COMPARATOR 1 SINK OUTPUT COMPARATOR 1 SOURCE OUTPUT COMPARATOR 1 INVERTING INPUT COMPARATOR 1 NON-INVERTING INPUT GROUND / V- SUPPLY - VOS E-Trim COMPARATOR 1 + VOS E-Trim COMPARATOR 1 No Connect/Do Not connect externally No Connect/Do Not connect externally +VOS E-Trim COMPARATOR 2 - VOS E-Trim COMPARATOR 2 COMPARATOR 2 NON-INVERTING INPUT COMPARATOR 2 INVERTING INPUT COMPARATOR 2 SOURCE OUTPUT COMPARATOR 2 SINK OUTPUT V+ SUPPLY Advanced Linear Devices ALD2321A/ALD2321B ALD2321 ABSOLUTE MAXIMUM RATINGS Supply voltage, V+ Differential input voltage range Power dissipation Operating temperature range PC, SC package DC package Storage temperature range Lead temperature, 10 seconds +10.6V -0.3V to V+ +0.3V 600 mW 0C to +70C -55C to +125C -65C to +150C +260C OPERATING ELECTRICAL CHARACTERISTICS TA = 25C V+ = +5V unless otherwise specified 2321A Parameter Supply Voltage Supply Current Symbol V+ IS Min 3 110 Typ Max 10 180 Min 3 110 2321B Typ Max 10 180 Min 3 110 2321 Typ Max 10 180 Unit V A No Load Two Comparators RLOAD 15K RLOAD 1.5K Test Conditions Voltage Gain Input Offset Voltage Input Offset Current 1 Input Bias Current1 Common Mode Input 2 Voltage Range Low Level Sink Output Voltage Low Level Sink Output Current High Level Source Output Voltage Source Output Leakage Current Sink Output Leakage Current Response Time2 AVD VOS IOS IB VICR 50 150 0.05 0.01 0.01 0.2 20 20 V+ -1.5 50 150 0.2 0.01 0.01 0.5 20 20 V+ -1.5 50 150 0.5 0.01 0.01 1.0 20 20 V+ -1.5 V/mV mV pA pA V -0.3 -0.3 -0.3 VOL 0.15 0.4 0.15 0.4 0.15 0.4 V ISINK = 12mA VINPUT = 1V Differential VOL = 1.0 V SINK OUTPUT ON ISOURCE = -2mA SOURCE OUTPUT ON VOH = 0.0V SOURCE OUTPUT OFF VOUT = 5.0 V SINK OUTPUT OFF RL = 5.1K, C L = 15pF 5mV Input Step/ 0mV Overdrive RL = 5.1K ,C L =15pF 1mVInput Step/ 0mV Overdrive IOL 24 50 24 50 24 50 mA VOH 3.5 4.5 3.5 4.5 3.5 4.5 V IHL 0.01 1 0.01 1 0.01 1 nA IL 0.01 20 0.01 20 0.01 20 nA tRP 1.1 1.1 1.1 s tRP 2.4 2.4 2.4 s Common Mode Rejection Ratio Power Supply Rejection Ratio Change of Vos / VExx Notes: 1 2 CMRR 80 80 80 dB VINPUT = 0V to 2.5V V+ = 4V to 5V PSRR 75 75 75 dB VOS VE 5 5 5 mV/V VE pins No Load Consists of junction leakage currents Sample test parameter ALD2321A/ALD2321B ALD2321 Advanced Linear Devices 3 TYPICAL PERFORMANCE CHARACTERISTICS SUPPLY CURRENT vs.TEMPERATURE 200 SUPPLY CURRENT vs. SUPPLY VOLTAGE 200 SUPPLY CURRENT (A) SUPPLY CURRENT (A) 180 160 140 120 100 80 60 -55 -25 0 25 50 V = +5V No Load Two Comparators + 180 160 140 120 100 80 60 40 20 0 No Load Two Comparators TA = -550C TA = 250C TA = 1250C 75 100 125 0 2 4 6 8 10 12 AMBIENT TEMPERATURE (C) SUPPLY VOLTAGE (V) INPUT BIAS CURRENT vs. TEMPERATURE 1000 LOW LEVEL OUTPUT VOLTAGE vs. TEMPERATURE LOW LEVEL OUTPUT VOLTAGE (V) 0.5 0.4 0.3 0.2 0.1 0.0 -55 -25 0 25 50 75 100 125 ISINK = 12mA VINPUT = 1V Differential V+ = +3.5V INPUT BIAS CURRENT (pA) V+ = +5V 100 10 V+ = +5V 1 V+ = +10V 0 -55 -25 0 25 50 75 100 125 AMBIENT TEMPERATURE (0C) AMBIENT TEMPERATURE (C) SATURATION VOLTAGE vs. SINK CURRENT OUTPUT SATURATION VOLTAGE (V) HIGH LEVEL OUTPUT VOLTAGE vs. HIGH LEVEL OUTPUT LEAKAGE CURRENT HIGH LEVEL OUTPUT CURRENT (nA) 100.0 VOH = V+ 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 15 30 45 TA = -550C 60 75 V+ = +5V TA = 1250C TA = 850C TA = 250C TA = -250C TA = 1250C 10.0 1.0 TA = 850C 0.1 TA = 250C 0.0 3 4 5 6 7 8 9 10 HIGH LEVEL OUTPUT VOLTAGE (V) 11 OUTPUT SINK CURRENT (mA) ALD2321A/ALD2321B ALD2321 Advanced Linear Devices 4 TYPICAL PERFORMANCE CHARACTERISTICS HIGH LEVEL OUTPUT VOLTAGE vs. TEMPERATURE HIGH LEVEL OUTPUT VOTAGE (V) 10.0 INPUT OFFSET VOLTAGE vs. TEMPERATURE INPUT OFFSET VOLTAGE (mV) 2.0 1.6 1.2 0.8 0.4 0.0 -0.4 -0.8 -1.2 -1.6 -2.0 V+ = +5V RL = 5.1K 8.0 6.0 V+ = +10V IOH = -2mA V = +2.5V + V+ = +5V 4.0 2.0 0.0 -55 -25 0 25 50 75 100 125 V+ = +4V -55 -25 0 25 50 75 100 125 AMBIENT TEMPERATURE (C) AMBIENT TEMPERATURE (C) COMMON MODE REJECTION RATIO vs. TEMPERATURE COMMON MODE REJECTION MODE (dB) RESPONSE TIME FOR VARIOUS INPUT OVERDRIVES 6.0 OUTPUT VOLTAGE (V) 90.0 85.0 80.0 75.0 70.0 65.0 V = +5V RL = 5.1K + RL = 5.1K 50mV 20mV CL = 15pF Input Step 5.0 4.0 3.0 2.0 1.0 0.0 10mV 5mV 2mV 1mV 60.0 -55 -25 0 25 50 75 100 125 V = +5V + TA = 250C -1.0 0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 TIME (S) AMBIENT TEMPERATURE (C) RESPONSE TIME FOR VARIOUS INPUT OVERDRIVES 6.0 5.0 OUTPUT VOLTAGE (V) POWER SUPPLY REJECTION RATIO (dB) POWER SUPPLY REJECTION RATIO vs.TEMPERATURE 90.0 85.0 80.0 75.0 70.0 65.0 60.0 -55 -25 0 25 50 75 100 AMBIENT TEMPERATURE (0C) 125 V+ = +5V RL = 5.1K 1mV 4.0 3.0 2.0 1.0 50mV 0.0 -1.0 0.0 0.3 0.6 0.9 1.2 1.5 1.8 TIME (S) 2.1 2.4 2.7 3.0 20mV 10mV 2mV + V = +5V TA = 250C 5mV RL = 5.1K CL = 15pF Input Step ALD2321A/ALD2321B ALD2321 Advanced Linear Devices 5 TYPICAL PERFORMANCE CHARACTERISTICS TRANSFER FUNCTION COMMON - MODE VOLTAGE LIMITS (V) 0.5 V+ -0.5 -1.0 0.5 V-0.5 -55 -25 0 25 50 75 100 125 VS = 2.5 V COMMON - MODE VOLTAGE REFERRED TO SUPPL VOLTAGE Y +6.0 OUTPUT VOLTAGE (V) TA = 25C VS = 6V 0.0 -6.0 -2.5 0.0 DIFFERENTIAL INPUT VOLTAGE (mV) +2.5 TEMPERATURE (C) OUTPUT HIGH VOLTAGE FROM V+ (V) OUTPUT HIGH VOLTAGE vs. SUPPLY VOLTAGE V+ -0.6 OUTPUT LOW VOLTAGE vs. SUPPLY VOLTAGE 0.6 OUTPUT LOW VOLTAGE (V) V+ -0.5 V+ -0.4 V+ -0.3 V+ -0.2 TA = 25C IOH = -2mA 0.5 0.4 0.3 0.2 0.1 0.0 TA = 25C IOL= 12mA V+ -0.1 V+ 2 4 6 8 SUPPLY VOLTAGE (V) 10 12 2 4 6 8 SUPPLY VOLTAGE (V) 10 12 TYPICAL APPLICATIONS PRECISION SINGLE SUPPLY VOLTAGE COMPARATOR WITH DIRECT RELAY DRIVER VOLTAGE COMPARATOR WITH +/-5V SUPPLY AND +5V RELAY DRIVE +5 +5 5VRELAY VR VIN +5 VINVIN+ + + -5 5VRELAY 1K ALD2321A/ALD2321B ALD2321 Advanced Linear Devices 6 TYPICAL APPLICATIONS VOLTAGE COMPARATOR WITH COMPLEMENTARY OUTPUT DRIVERS VOLTAGE COMPARATOR WITH OUTPUT FEEDBACK TO PROVIDE HYSTERSIS +5V +5V +5V VINVIN+ RLoad1 =200 VA= 1V to +30V +5V RLoad VOUT + OUTH RLoad2=1K VR VIN VE22 OUT OUTH 2N2222 15K 2.2M -5V VOLTAGE COMPARATOR WITH +/-5V SUPPLY AND OUTPUT LEVEL SHIFT VOLTAGE COMPARATOR WITH OUTPUT LEVEL SHIFT AND HIGH CURRENT LOAD DRIVER +5V +5V 100K 0.1F 15K VOUT +5V VOUT 100K 0.1F -5V +5V +5V VINVIN+ R1= 15K VOUT 0.066V 0 + 15K + -5V R2=50 VOUT 200 RLoad -4V VOLTAGE COMPARATOR WITH SINGLE SUPPLY AND OUTPUT LEVEL SHIFT VOLTAGE COMPARATOR WITH COMPLEMENTARY OUTPUTS VA= 0V to +10V +5V VINVIN+ V+ + VOUT +10V VREF VIN Q 1/2 ALD2321 + VOUT - 0 + - Q 1/2 ALD2321 ALD2321A/ALD2321B ALD2321 Advanced Linear Devices 7 TYPICAL APPLICATIONS DUAL LIMIT WINDOW COMPARATOR DUAL LIMIT PHOTO DETECTOR MONITOR VExternal V+ 1/2 ALD2321 VREF(HIGH) RLOAD V+ BUZZER 1/2 ALD2321 LED + - VLIMIT2 + VOUT VLIMIT 1 VIN VREF(LOW) + 1/2 ALD2321 LIGHT PHOTODETECTOR + 1/2 ALD2321 RLOAD = 1.5K OUTPUT HIGH FOR VIN LED turns on as photo-detector voltage reaches VLIMIT1. Both LED and horn turns on as photodetector voltage reachesVLIMIT2. VEXTERNAL= +12V, V+ = +5V RESPONSE TIME MEASUREMENT CIRCUIT Response time is defined as the internal between the application of an input step function and the instant when the output reaches 50% of its maximum value as measured by the following test circuit: +5V 5.1K 10X INPUT STEP 9K VIN 1K PINS OUT1, OUT1H, OUT2, OUT2H, INTERNAL CIRCUIT CONFIGURATIONS V+ V+ OUT1 OUT1H OUT1 OUT OUT2 OUT2H OUT2 + E-TRIM CIRCUIT -IN +IN Level Shift/ Scaling Input Offset Trim Circuit + OUTH OUT VE1x* VE2x* Level Shift/ Scaling Input Offset Trim Circuit * These pins should be isolated by surrounding them with ground trace in user's applications. ALD2321A/ALD2321B ALD2321 Advanced Linear Devices 8 |
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