ADVANCED LINEAR DEVICES, INC. ALD2321A/ALD2321B ALD2321 ULTRA LOW VOS EPAD® DUAL CMOS ANALOG VOLTAGE COMPARATOR GENERAL DESCRIPTION PRODUCT FEATURES 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® 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. * 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 µA 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 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. 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 1 16 V+ OUT1H 2 15 OUT2 -IN1 3 14 OUT2H +IN1 4 13 -IN2 GND 5 12 +IN2 VE11 6 11 VE21 ORDERING INFORMATION Operating Temperature Range* 0°C to +70°C 0°C to +70°C -55°C to +125°C VE12 7 10 VE22 16-pin Small Outline Package (SOIC) 16-Pin Plastic DIP Package (PDIP) 16-Pin Ceramic DIP Package (CDIP) N/C* 8 9 N/C* ALD2321ASC ALD2321BSC ALD2321SC ALD2321APC ALD2321BPC ALD2321PC ALD2321ADC ALD2321BDC ALD2321DC DC, PC, SC PACKAGE * *N/C pins are connected internally. Do not connect externally. * Contact factory for industrial temperature range © 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. 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 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 (16) V+ INVERTING INPUT -IN 1 (3) - NONINVERTING INPUT +IN 1 (4) + PIN # SYMBOL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 OUT1 OUT1H -IN1 +IN1 GND VE11 VE12 N/C N/C VE22 VE21 +IN2 -IN2 OUT2H OUT2 V+ ALD2321A/ALD2321B ALD2321 (1) OUT1 (7) VE12 (6) VE11 (5) GND INVERTING INPUT -IN 2 (13) - NONINVERTING INPUT +IN 2 (12) + FUNCTION (14) OUT2H (15) OUT2 (10) VE22 (11) VE21 (8) N/C ALD2321 PIN IDENTIFICATION (2) OUT1H (9) N/C 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 Advanced Linear Devices OUTPUT OUTPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT OUTPUT OUTPUT 2 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 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 V+ 3 Supply Current IS Typ 110 50 2321B Max Min 10 3 180 Typ 110 150 50 2321 Max Min 10 3 180 110 V 180 µA No Load Two Comparators mV RLOAD ≥ 1.5KΩ 0.01 20 pA 0.01 20 pA V+ -1.5 V 0.4 V VOS 0.05 0.2 0.2 0.5 0.5 Input Offset Current 1 IOS 0.01 20 0.01 20 Input Bias Current1 IB 0.01 20 0.01 20 V+ -1.5 10 Test Conditions 1.0 Input Offset Voltage 150 Common Mode Input 2 Voltage Range VICR Low Level Sink Output Voltage VOL Low Level Sink Output Current IOL 24 50 24 50 24 50 mA High Level Source Output Voltage VOH 3.5 4.5 3.5 4.5 3.5 4.5 V ISOURCE = -2mA SOURCE OUTPUT ON 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 Response Time2 tRP 1.1 1.1 1.1 µs RL = 5.1KΩ, C L = 15pF 5mV Input Step/ 0mV Overdrive tRP 2.4 2.4 2.4 µs RL = 5.1KΩ ,C L =15pF 1mVInput Step/ 0mV Overdrive 0.15 -0.3 Unit RLOAD ≥ 15K AVD V+ -1.5 50 Max V/mV Voltage Gain -0.3 150 Typ 0.4 0.15 -0.3 0.4 0.15 ISINK = 12mA VINPUT = 1V Differential VOL = 1.0 V SINK OUTPUT ON 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 TYPICAL PERFORMANCE CHARACTERISTICS SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY CURRENT vs.TEMPERATURE 200 180 + 180 V = +5V No Load Two Comparators 160 SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) 200 140 120 100 80 No Load Two Comparators 160 TA = -550C 140 120 TA = 250C 100 80 60 TA = 1250C 40 20 0 60 -55 -25 25 0 50 75 100 0 125 2 AMBIENT TEMPERATURE (°C) INPUT BIAS CURRENT vs. TEMPERATURE V+ = +5V 100 10 1 -25 0 25 50 75 100 125 V+ = +3.5V 0.3 V+ = +5V 0.2 0.1 V+ = +10V 0.0 TA = 250C TA = -250C 1.0 0.5 TA = -550C 0.0 0 15 30 45 60 75 100.0 VOH = V+ 25 50 75 100 125 TA = 1250C 10.0 TA = 850C 1.0 0.1 TA = 250C 0.0 3 OUTPUT SINK CURRENT (mA) ALD2321A/ALD2321B ALD2321 0 -25 HIGH LEVEL OUTPUT VOLTAGE vs. HIGH LEVEL OUTPUT LEAKAGE CURRENT HIGH LEVEL OUTPUT CURRENT (nA) OUTPUT SATURATION VOLTAGE (V) TA = 1250C TA = 850C 1.5 12 AMBIENT TEMPERATURE (°C) 3.0 2.0 10 ISINK = 12mA VINPUT = 1V Differential 0.4 -55 SATURATION VOLTAGE vs. SINK CURRENT V+ = +5V 8 0.5 AMBIENT TEMPERATURE (0C) 2.5 6 LOW LEVEL OUTPUT VOLTAGE vs. TEMPERATURE LOW LEVEL OUTPUT VOLTAGE (V) INPUT BIAS CURRENT (pA) 1000 0 -55 4 SUPPLY VOLTAGE (V) Advanced Linear Devices 4 5 6 7 8 9 10 HIGH LEVEL OUTPUT VOLTAGE (V) 11 4 TYPICAL PERFORMANCE CHARACTERISTICS INPUT OFFSET VOLTAGE vs. TEMPERATURE 10.0 8.0 INPUT OFFSET VOLTAGE (mV) HIGH LEVEL OUTPUT VOTAGE (V) HIGH LEVEL OUTPUT VOLTAGE vs. TEMPERATURE 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 AMBIENT TEMPERATURE (°C) 6.0 RL = 5.1KΩ + V = +5V RL = 5.1KΩ OUTPUT VOLTAGE (V) COMMON MODE REJECTION MODE (dB) 25 50 75 100 125 RESPONSE TIME FOR VARIOUS INPUT OVERDRIVES 90.0 85.0 0 AMBIENT TEMPERATURE (°C) COMMON MODE REJECTION RATIO vs. TEMPERATURE 80.0 75.0 70.0 5.0 CL = 15pF Input Step 50mV 4.0 20mV 3.0 10mV 2.0 5mV 2mV 1mV 1.0 65.0 0.0 60.0 -55 -25 0 25 50 75 100 + V = +5V TIME (µS) POWER SUPPLY REJECTION RATIO (dB) RESPONSE TIME FOR VARIOUS INPUT OVERDRIVES 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 vs.TEMPERATURE 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 TA = 250C -1.0 0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 125 AMBIENT TEMPERATURE (°C) OUTPUT VOLTAGE (V) + V = +2.5V 1.2 Advanced Linear Devices -25 0 25 50 75 100 AMBIENT TEMPERATURE (0C) 125 5 TYPICAL PERFORMANCE CHARACTERISTICS COMMON - MODE VOLTAGE REFERRED TO SUPPLY VOLTAGE COMMON - MODE VOLTAGE LIMITS (V) TRANSFER FUNCTION OUTPUT VOLTAGE (V) +6.0 TA = 25°C VS = ±6V 0.0 -6.0 -2.5 0.5 -0.5 -1.0 ≈ ≈ 0.5 V-0.5 -55 +2.5 0.0 VS = ± 2.5 V V+ -25 0 DIFFERENTIAL INPUT VOLTAGE (mV) 50 75 100 125 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) 25 TEMPERATURE (°C) 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 PRECISION SINGLE SUPPLY VOLTAGE COMPARATOR WITH DIRECT RELAY DRIVER VOLTAGE COMPARATOR 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 TYPICAL APPLICATIONS 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- - VIN+ + VOUT VOUT +10V + Q - 1/2 ALD2321 VREF 0 VIN + - ALD2321A/ALD2321B ALD2321 Advanced Linear Devices Q 1/2 ALD2321 7 TYPICAL APPLICATIONS DUAL LIMIT WINDOW COMPARATOR DUAL LIMIT PHOTO DETECTOR MONITOR VExternal V+ V+ 1/2 ALD2321 + VREF(HIGH) BUZZER RLOAD 1/2 ALD2321 LED - VLIMIT2 + VOUT - + VIN VREF(LOW) VLIMIT 1 LIGHT 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 PINS OUT1, OUT1H, OUT2, OUT2H, INTERNAL CIRCUIT CONFIGURATIONS 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 V+ OUT2 9KΩ V+ OUT1 5.1KΩ 10X INPUT STEP + PHOTODETECTOR 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