LR2903D

LESHAN RADIO COMPANY, LTD. Dual Differential Comparators LR2903D DESCRIPTION The LR2903D consists of two voltage comparators with an offset voltage specification as low as 2.0mV max. These were designed specifically to operate from a single power supply over a wide range of voltages. Operation from split power supplies is also possible, and the low power supply current drain is independent of the magnitude of the power supply voltage. These comparators also have a unique characteristic in that the input common-mode voltage range includes ground, even though operated from a single power supply voltage. SOP-8 FEATURES • • • • • • • • • Wide supply voltage range Low supply current drain independent of the supply voltage Low input biasing current Low input offset current Low input offset voltage Input common-mode voltage range includes GND Differential input voltage range equal to the power supply voltage Low output saturation voltage. Output voltage compatible with TTL, MOS and CMOS logic ORDERING INFORMATION Device Package LR2903D SOP-8 BLOCK DIAGRAM VCC + Input − Input Output PIN CONFIGURATION R2 2.1 k Q3 Q4 R4 Q5 Q6 Q14 2.0 k Output 1 1 F1 -Input 1 2 − +Input 1 3 + Q10 Q1 Q8 Q9 Q16 Q12 Q2 R1 4.6 k Q15 Q11 GND 4 8 Vcc 7 Output 2 6 -Input 2 − + 5 +Input 2 (Top View) NOTE: Diagram shown is for 1 comparator Ver1.0 1/5 LESHAN RADIO COMPANY, LTD. PIN DESCRIPTIONS Description Output 1 -Input1 +Input1 Ground No. 1 2 3 4 Symbol OUT1 IN1˄-˅ IN1˄+˅ GND No. 5 6 7 8 Description +Input2 -Input2 Output 2 Supply Voltage Symbol IN2˄+˅ IN2˄-˅ OUT2 Vcc ELECTRICAL CHARACTERISTICS at specified free-air temperature, VCC=5V (unless otherwise noted) PARAMETER VIO Input offset voltage TEST CONDITIONS1 VCC=5V to 30V, VIC=VICR min, VO=1.4V lIO VO=1.4V Input offset current IIB VO=1.4V Input bias current VICR Common-mode input voltage range2 AVD VCC=15V, Large-signal differential voltage VO=1.4V to 11.4V, RL ≥ 15kΩ to Vcc amplification VOH=5V, VID=1V lOH High-level output current VOH=30V, VID=1V VOL IOL=4mA, VID=-1V Low-level output voltage lOL VOL=1.5V, VID=-1V Low-level output current VCC=5V ICC RL=∞ Supply current VCC=30V Response time RL connected to 5V through 5.1kΩ, CL=15pF3 MIN TYP MAX UNIT 2 25℃ Full range 25℃ Full range 25℃ Full range 25℃ Full range 25℃ 9 5 -25 0 to Vcc-1.5 0 to Vcc-2 50 25℃ Full range 100mV input step with 5mV overdrive TTL-level input step 50 150 -250 -400 mV nA nA V 200 0.1 25℃ Full range 25℃ Full range 25℃ 5 150 V/mV 50 1 400 700 6 nA μA mV mA 0.8 1 2.5 mA 1.3 μs 0.3 NOTE 1. Full range (MIN to MAX) for the LR2903D is -40℃ to 125℃. All characteristics are measured with zero common-mode input voltage unless otherwise specified. 2. The voltage at either input or common-mode should not be allowed to go negative by more than 0.3V. The upper end of the common-mode voltage range is VCC-1.5V, but either or both inputs can go to 30V without damage. 3. CL includes probe and jig capacitance. The response time specified is the interval between the input step function and the instant, when the output crosses 1.4V. Ver1.0 2/5 LESHAN RADIO COMPANY, LTD. TYPICAL PERFORMANCE CHARACTERISTICS Figure 1. Input Bias Current vs Power Supply Voltage Figure 2. Output Saturation Voltage vs Output Sink Current Figure 3. Power Supply Current vs Power Supply Voltage Ver1.0 3/5 LESHAN RADIO COMPANY, LTD. TYPICAL APPLICATION CIRCUITS +15 V Vin R1 8.2 k R4 220 k R1 D1 6.8 k R2 R5 220 k Vin(min) Vin 10 k * LR2903D +VCC )  10 k * 15 k R3 10 M LR2903D Vin VCC ) D1 prevents input from going negative by more than 0.6 V. R1 + R2 = R3 R5 R3 ≤ for small error in zero crossing. 10  VO −VEE Vin(min) [ 0.4 V peak for 1% phase distortion (
). Figure 4. Zero Crossing Detector (Single Supply) Figure 5. Zero Crossing Detector (Split Supply) VCC 1.0 M VCC 0.001 F 51 k 51 k t VCC LR2903D R + LR2903D VC C + VO VO + 51 k RL − LR2903D + Vref ‘‘ON’’ for t ­ tO +
t where: Vref )
t = RC ȏ n ( VCC VCC VO 0 t Figure 6. Free−Running Square−Wave Oscillator Ver1.0 VCC − RL 10 k −
 − VEE Vin Vref 0 VO 0 VC 0 tO Vref ȏ t Figure 7. Time Delay Generator 4/5 LESHAN RADIO COMPANY, LTD. MECHANICAL DIMENSIONS Unit: mm SOP-8 SOP-8 DIM MIN NOR MAX A − 1.75 − A1 0.10 0.15 0.20 A2 1.35 1.45 1.55 b 0.33 0.42 0.51 c 0.15 0.22 0.29 D 4.77 4.90 5.03 E 5.80 6.00 6.20 E1 3.80 3.90 4.00 e 1.27BSC L 0.46 0.66 0.86 L1 0.85 1.05 1.25 θ 0º 5º 8º B − 0.55 − H 0 0.05 0.10 All Dimensions in mm SUGGESTED PAD LAYOUT SOP-8 DIM C1 X Y C1 C2 C2 Ver1.0 (mm) 0.60 1.55 5.40 1.27 X 5/5