ADVANCED LINEAR DEVICES, INC. ALD2321A/ALD2321B/ALD2321 ULTRA LOW VOS EPAD® DUAL CMOS ANALOG VOLTAGE COMPARATOR FEATURES 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 on-chip e-trim (EPAD® 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 1mV can be resolved and detected reliably without requiring amplification. Sensor or detector signals with signal power as low as 0.004pW (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 50mA. 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. The Source Output can source up to 2mA and can be used to drive the base terminal of an external NPN bipolar device or the gate of a Nchannel MOSFET device. Alternatively, the two outputs, Source Output and ORDERING INFORMATION (“L” suffix for lead free version) Operating Temperature Range * 0°C to +70°C 0°C to +70°C -55°C to +125°C 16-Pin Small Outline Package (SOIC) 16-Pin Plastic Dip Package 16-Pin CERDIP Package ALD2321ASCL ALD2321BSCL ALD2321SCL ALD2321APCL ALD2321BPCL ALD2321PCL ALD2321ADC ALD2321BDC ALD2321DC • • • • • • • • • • • • • Ultra low signal power of 4fW detectable Ultra low offset voltage of max. 0.2mV Ultra low input bias currents of typ. 0.01pA Low supply current of 110µA typical Virtually eliminates source impedance effects Low operating supply voltage of 4V 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 • • • • • • • 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 1 16 V+ OUT1H 2 15 OUT2 -IN1 3 14 OUT2H +IN1 4 13 -IN2 GND 5 12 +IN2 VE11 6 11 VE21 VE12 7 10 VE22 N/C* 8 9 N/C* SCL, PCL, DC PACKAGES *N/C pins are connected internally. Do not connect externally. * Contact factory for leaded (non-RoHS) or high temperature versions. Rev 2.0 ©2010 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286 www.aldinc.com GENERAL DESCRIPTION (cont'd) 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 etrim pins, VE11, VE12, VE21, and VE22. These pins are used for trimming of the voltage comparator offset voltages 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 a 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 1000pF 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) + (14) OUT2H (15) OUT2 (10) VE22 (11) VE21 (8) N/C (9) N/C 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 SIGNAL PROPAGATION 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 ALD2321A/ALD2321B/ALD2321 Advanced Linear Devices OUTPUT OUTPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT OUTPUT OUTPUT 2 of 11 ABSOLUTE MAXIMUM RATINGS Supply voltage, V+ Differential input voltage range Power dissipation Operating temperature range PCL, SCL packages DC package Storage temperature range Lead temperature, 10 seconds +10.6V -0.3V to V+ +0.3V 600 mW 0°C to +70°C -55°C to +125°C -65°C to +150°C +260°C OPERATING ELECTRICAL CHARACTERISTICS TA = 25°C V+ = +5V unless otherwise specified 2321A Parameter Symbol Min Supply Voltage VS V+ ±2 4 Supply Current Current IS Typ 110 Min ±5 10 ±2 4 180 110 Min ±5 10 ±2 4 180 110 VOS 0.05 0.2 0.2 0.5 0.5 Input Offset Current1 IOS 0.01 20 0.01 20 Input Bias Current1 IB 0.01 20 0.01 20 VOL Low Level Sink Output Current IOL V+ -1.5 -0.3 0.15 150 Typ Input Offset Voltage Low Level Sink Output Voltage 50 2321 Max AVD VICR 150 Typ Voltage Gain Common Mode Input 2 Voltage Range 50 2321B Max V+ -1.5 -0.3 0.4 50 0.15 Unit Test Conditions ±5 10 V V Dual Supply Single Supply 180 µA No Load Two Comparators 150 V/mV RLOAD ≥ 15K 1.0 mV RLOAD ≥ 1.5KΩ 0.01 20 pA 0.01 20 pA V+ -1.5 V 0.4 V -0.3 0.4 Max 0.15 ISINK = 12mA VINPUT = 1V Differential 24 50 24 50 24 50 mA VOL = 1.0 V SINK OUTPUT ON 3.5 4.5 3.5 4.5 3.5 4.5 V ISOURCE = -2mA SOURCE OUTPUT ON High Level Source Output Voltage VOH Source Output Leakage Current IHL 0.01 1 0.01 1 0.01 1 nA VOH = 0.0V SOURCE OUTPUT OFF Sink Output Leakage Current IL 0.01 20 0.01 20 0.01 20 nA VOUT = 5.0 V SINK OUTPUT OFF tRP 1.1 1.1 1.1 µs RL = 5.1KΩ, CL = 15pF 5mV Input Step/ 0mV Overdrive tRP 2.4 2.4 2.4 µs RL = 5.1KΩ ,CL =15pF 1mVInput Step/ 0mV Overdrive 2 Response Time Common Mode Rejection Ratio CMRR 80 80 80 dB VINPUT = 0V to 2.5V Power Supply Rejection Ratio PSRR 75 75 75 dB V+ = 4V to 5V Change of Vos / VExx ∆VOS ∆VE 5 5 5 mV/V Notes: 1 2 VE pins No Load Consists of junction leakage currents Sample test parameter ALD2321A/ALD2321B/ALD2321 Advanced Linear Devices 3 of 11 TYPICAL PERFORMANCE CHARACTERISTICS SUPPLY CURRENT vs.TEMPERATURE SUPPLY CURRENT vs. SUPPLY VOLTAGE 200 V+ = +5V No Load Two Comparators 160 180 SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) 200 180 140 120 100 80 No Load Two Comparators 160 TA = -550C 140 120 TA = 250C 100 80 60 TA = 1250C 40 20 60 0 -55 -25 25 0 50 75 100 125 0 2 4 INPUT BIAS CURRENT vs. TEMPERATURE V+ = +5V 100 10 1 -25 0 25 50 75 100 125 V+ = +3.5V 0.3 + 0.2 V = +5V 0.1 V+ = +10V 0.0 -55 TA = 1250C TA = 850C TA = 250C 1.5 TA = -250C 1.0 0.5 TA = -550C 0.0 0 15 30 45 60 OUTPUT SINK CURRENT (mA) ALD2321A/ALD2321B/ALD2321 75 50 100 125 75 HIGH LEVEL OUTPUT VOLTAGE vs. HIGH LEVEL OUTPUT LEAKAGE CURRENT HIGH LEVEL OUTPUT CURRENT (nA) OUTPUT SATURATION VOLTAGE (V) 3.0 2.0 25 0 -25 AMBIENT TEMPERATURE (°C) SATURATION VOLTAGE vs. SINK CURRENT + 12 ISINK = 12mA VINPUT = 1V Differential 0.4 AMBIENT TEMPERATURE ( C) V = +5V 10 0.5 0 2.5 8 LOW LEVEL OUTPUT VOLTAGE vs. TEMPERATURE LOW LEVEL OUTPUT VOLTAGE (V) INPUT BIAS CURRENT (pA) 1000 0 -55 6 SUPPLY VOLTAGE (V) AMBIENT TEMPERATURE (°C) 100.0 VOH = V+ TA = 1250C 10.0 TA = 850C 1.0 0.1 TA = 250C 0.0 3 4 5 6 7 8 9 10 11 HIGH LEVEL OUTPUT VOLTAGE (V) Advanced Linear Devices 4 of 11 TYPICAL PERFORMANCE CHARACTERISTICS (cont'd) HIGH LEVEL OUTPUT VOLTAGE vs. TEMPERATURE INPUT OFFSET VOLTAGE vs. TEMPERATURE 8.0 INPUT OFFSET VOLTAGE (mV) HIGH LEVEL OUTPUT VOTAGE (V) 10.0 IOH = -2mA V+ = +10V 6.0 V+ = +5V 4.0 2.0 V+ = +4V 0.0 2.0 1.6 RL = 5.1KΩ 0.8 0.4 0.0 + V = +5V -0.4 -0.8 -1.2 -1.6 -2.0 -55 -25 0 25 50 75 100 125 -55 -25 25 50 75 100 125 RESPONSE TIME FOR VARIOUS INPUT OVERDRIVES 90.0 6.0 + OUTPUT VOLTAGE (V) V = +5V RL = 5.1KΩ 80.0 75.0 70.0 5.0 RL = 5.1KΩ CL = 15pF Input Step 50mV 4.0 20mV 3.0 10mV 2.0 5mV 2mV 1mV 1.0 65.0 0.0 0 V+ = +5V TA = 25 C -1.0 0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 60.0 -55 -25 0 25 50 75 100 125 AMBIENT TEMPERATURE (°C) TIME (µS) RESPONSE TIME FOR VARIOUS INPUT OVERDRIVES POWER SUPPLY REJECTION RATIO vs.TEMPERATURE 6.0 5.0 1mV 4.0 RL = 5.1KΩ CL = 15pF Input Step 3.0 2.0 20mV 5mV 10mV 1.0 2mV 50mV 0.0 + 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 POWER SUPPLY REJECTION RATIO (dB) COMMON MODE REJECTION MODE (dB) COMMON MODE REJECTION RATIO vs. TEMPERATURE 85.0 0 AMBIENT TEMPERATURE (°C) AMBIENT TEMPERATURE (°C) OUTPUT VOLTAGE (V) + V = +2.5V 1.2 90.0 V+ = +5V RL = 5.1KΩ 85.0 80.0 75.0 70.0 65.0 60.0 -55 TIME (µS) ALD2321A/ALD2321B/ALD2321 Advanced Linear Devices -25 0 25 50 75 100 AMBIENT TEMPERATURE (0C) 125 5 of 11 TYPICAL PERFORMANCE CHARACTERISTICS (cont'd) COMMON - MODE VOLTAGE REFERRED TO SUPPLY VOLTAGE COMMON - MODE VOLTAGE LIMITS (V) TRANSFER FUNCTION +6.0 OUTPUT VOLTAGE (V) TA = 25°C VS = ±6V 0.0 -6.0 -2.5 +2.5 0.0 0.5 V+ VS = ± 2.5 V -0.5 -1.0 ≈ ≈ 0.5 V-0.5 -55 -25 0 25 50 75 100 125 TEMPERATURE (°C) OUTPUT LOW VOLTAGE vs. SUPPLY VOLTAGE OUTPUT HIGH VOLTAGE vs. SUPPLY VOLTAGE V+ -0.6 0.6 OUTPUT LOW VOLTAGE (V) OUTPUT HIGH VOLTAGE FROM V+ (V) DIFFERENTIAL INPUT VOLTAGE (mV) TA = 25°C IOH = -2mA V+ -0.5 V+ -0.4 V+ -0.3 V+ -0.2 V+ -0.1 TA = 25°C IOL= 12mA 0.5 0.4 0.3 0.2 0.1 0.0 V+ 2 4 6 8 SUPPLY VOLTAGE (V) 12 10 2 4 6 8 SUPPLY VOLTAGE (V) 10 12 TYPICAL APPLICATIONS VOLTAGE COMPARATOR PRECISION SINGLE SUPPLY VOLTAGE COMPARATOR WITH DIRECT RELAY DRIVER WITH +/-5V SUPPLY AND +5V RELAY DRIVE +5 +5 +5 5VRELAY VR - VIN- - VIN + VIN+ + 5VRELAY 1K -5 ALD2321A/ALD2321B/ALD2321 Advanced Linear Devices 6 of 11 TYPICAL APPLICATIONS (cont'd) VOLTAGE COMPARATOR WITH VOLTAGE COMPARATOR WITH OUTPUT COMPLEMENTARY OUTPUT DRIVERS FEEDBACK TO PROVIDE HYSTERSIS +5V +5V +5V VIN- VA= 1V to +30V RLoad +5V RLoad1 =200Ω RLoad2=1K - OUT VR VOUT OUTH VIN+ + OUTH 2N2222 VE22 VIN 15K 2.2M -5V VOLTAGE COMPARATOR WITH +/-5V VOLTAGE COMPARATOR WITH OUTPUT LEVEL SUPPLY AND OUTPUT LEVEL SHIFT SHIFT AND HIGH CURRENT LOAD DRIVER +5V +5V +5V +5V 100K 15K VOUT - 0.1µF +5V + 15K R1= 15K VOUT - VOUT 0.066V VOUT 100K VINVIN+ 0 200Ω R2=50 + RLoad 0.1µF -4V -5V -5V VOLTAGE COMPARATOR WITH SINGLE VOLTAGE COMPARATOR WITH SUPPLY AND OUTPUT LEVEL SHIFT COMPLEMENTARY OUTPUTS VA= 0V to +10V V+ +5V VIN- - VOUT VOUT +10V VIN+ + Q - 1/2 ALD2321 VREF + 0 VIN + - ALD2321A/ALD2321B/ALD2321 Advanced Linear Devices Q 1/2 ALD2321 7 of 11 TYPICAL APPLICATIONS (cont'd) DUAL LIMIT WINDOW COMPARTOR DUAL LIMIT PHOTO DETECTOR MONTOR VExternal V+ V+ 1/2 ALD2321 VREF(HIGH) BUZZER RLOAD + 1/2 ALD2321 LED - VLIMIT2 + VOUT - + VIN VREF(LOW) VLIMIT 1 LIGHT - + PHOTODETECTOR 1/2 ALD2321 - RLOAD = 1.5KΩ OUTPUT HIGH FOR VIN <VREF(HIGH) AND VIN > VREF(LOW) 1/2 ALD2321 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 PINS OUT1, OUT1H, OUT2, OUT2H, INTERNAL CIRCUIT CONFIGURATIONS 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: V+ +5V OUT1 OUT2 5.1KΩ 10X INPUT STEP 9KΩ V+ OUT1H OUT2H OUT1 OUT2 OUT + VIN 1KΩ E-TRIM CIRCUIT -IN - +IN + VE1x* Level Shift/ Scaling Input Offset Trim Circuit VE2x* Level Shift/ Scaling Input Offset Trim Circuit OUTH OUT * These pins should be isolated by surrounding them with ground trace in user's applications. ALD2321A/ALD2321B/ALD2321 Advanced Linear Devices 8 of 11 SOIC-16 PACKAGE DRAWING 16 Pin Plastic SOIC Package E Millimeters S (45°) D Dim Min A 1.35 Max 1.75 0.053 Max 0.069 A1 0.10 0.25 0.004 0.010 b 0.35 0.45 0.014 0.018 C 0.18 0.25 0.007 0.010 D-16 9.80 10.00 0.385 0.394 E 3.50 4.05 0.140 0.160 A1 e Min 1.27 BSC e A Inches 0.050 BSC H 5.70 6.30 0.224 0.248 L 0.60 0.937 0.024 0.037 ø 0° 8° 0° 8° S 0.25 0.50 0.010 0.020 b S (45°) H L ALD2321A/ALD2321B/ALD2321 C ø Advanced Linear Devices 9 of 11 PDIP-16 PACKAGE DRAWING 16 Pin Plastic DIP Package E E1 Millimeters Dim D S A2 A1 e b A L Inches A Min 3.81 Max 5.08 Min 0.105 Max 0.200 A1 0.38 1.27 0.015 0.050 A2 1.27 2.03 0.050 0.080 b 0.89 1.65 0.035 0.065 b1 0.38 0.51 0.015 0.020 c 0.20 0.30 0.008 0.012 D-16 18.93 21.33 0.745 0.840 E 5.59 7.11 0.220 0.280 E1 7.62 8.26 0.300 0.325 e 2.29 2.79 0.090 0.110 e1 L 7.37 7.87 0.290 0.310 2.79 3.81 0.110 0.150 S-16 0.38 1.52 0.015 0.060 ø 0° 15° 0° 15° b1 c e1 ø ALD2321A/ALD2321B/ALD2321 Advanced Linear Devices 10 of 11 CERDIP-16 PACKAGE DRAWING 16 Pin CERDIP Package Millimeters E E1 D A1 s A L L2 b L1 Inches Dim A Min 3.55 Max 5.08 Min 0.140 Max 0.200 A1 1.27 2.16 0.050 0.085 b 0.97 1.65 0.038 0.065 b1 0.36 0.58 0.014 0.023 C 0.20 0.38 0.008 0.015 D-16 -- 21.34 -- 0.840 E 5.59 7.87 0.220 0.310 E1 7.73 8.26 0.290 0.325 e 2.54 BSC 0.100 BSC e1 7.62 BSC 0.300 BSC L 3.81 5.08 0.150 0.200 L1 3.18 -- 0.125 -- L2 0.38 1.78 0.015 0.070 S -- 2.49 -- 0.098 Ø 0° 15° 0° 15° b1 e C e1 ALD2321A/ALD2321B/ALD2321 ø Advanced Linear Devices 11 of 11