Low-power quad voltage comparator

1 LM2901. Low-power quad voltage comparator Features Wide single supply voltage range or dual supplies for all devices: +2 V to +36 V or 1 V N. to 18 V DIP14. Very low supply current ( mA) independent (Plastic package). of supply voltage ( mW/ comparator at +5 V). Low input bias current: 25 nA typ. Low input offset current: 5 nA typ. Input common-mode voltage range includes D. negative rail SO-14. Low output saturation voltage : (Plastic micropackage). 250 mV typ. (IO = 4 mA). Differential input voltage range equal to the supply voltage TTL, DTL, ECL, MOS, CMOS compatible P. outputs TSSOP14. (Thin shrink small outline package). Description This device consists of four independent precision voltage comparators , which are designed specifically to operate from a single supply over a wide range of voltages. Operation from split Q4. power supplies is also possible. QFN16 3x3.

2 (Plastic micropackage). These comparators also have a unique characteristic in that the input common-mode voltage range includes the negative rail even though operated from a single power supply voltage . February 2012 Doc ID 2468 Rev 7 1/17. 17. Pin connection and schematic diagram LM2901. 1 Pin connection and schematic diagram Figure 1. Pin connections (top view). Output 2 1 14 O u tput 3. Output 1 2 13 O u tput 4. VCC+ 3 12 VC C - Inverting input 1 4 11 Non-inverting input 4. Non-inverting input 1 5 10 Inverting input 4. Inverting input 2 6 9 Non-inverting input 3. Non-inverting input 2 7 8 Inverting input 3. Figure 2. Schematic diagram VCC. A 100 A A 100 A. Non-inverting input VO. Inverting input VCC. 2/17 Doc ID 2468 Rev 7. LM2901 Absolute maximum ratings and operating conditions 2 Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings Symbol Parameter Value Unit VCC Supply voltage 18 to 36 V.

3 Vid Differential input voltage 36 V. Vin Input voltage to +36 V. Output short-circuit to ground (1). Thermal resistance junction to ambient(2). DIP14 80. Rthja SO-14 105 C/W. TSSOP14 100. QFN16 3x3 45. Thermal resistance junction to case(2). DIP14 33. Rthjc SO-14 31. TSSOP14 32. QFN16 3x3 14. Tj Maximum junction temperature +150 C. Tstg Storage temperature range -65 to +150 C. HBM: human body model(3) 500 V. ESD (4). MM: machine model 100 V. CDM: charged device model(5) 1500 V. 1. Short-circuits from the output to VCC+ can cause excessive heating and eventual destruction. The maximum output current is approximately 20 mA, independent of the magnitude of VCC+. 2. Short-circuits can cause excessive heating. Destructive dissipation can result from simultaneous short- circuits on all amplifiers. All values are typical. 3. Human body model: a 100 pF capacitor is charged to the specified voltage , then discharged through a k resistor between two pins of the device.

4 This is done for all couples of connected pin combinations while the other pins are floating. 4. Machine model: a 200 pF capacitor is charged to the specified voltage , then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 ). This is done for all couples of connected pin combinations while the other pins are floating. 5. Charged device model: all pins and the package are charged together to the specified voltage and then discharged directly to the ground through only one pin. This is done for all pins. Table 2. Operating conditions Symbol Parameter Value Unit 2 to 32. VCC Supply voltage V. 1 to 16. Common mode input voltage range 0 to (VCC+ ). Vicm V. Tmin Tamb Tmax 0 to (VCC+ -2). Toper Operating free-air temperature range -40 to +125 C. Doc ID 2468 Rev 7 3/17. Electrical characteristics LM2901. 3 Electrical characteristics Table 3.

5 Electrical characteristics at VCC+ = 5 V, VCC- = GND, Tamb = 25 C. (unless otherwise specified). Symbol Parameter Min. Typ. Max. Unit Input offset voltage (1) 1 7. Vio mV. Tmin Tamb Tmax 15. Input offset current 5 50. Iio nA. Tmin Tamb Tmax 150. Input bias current (II+ or II-) (2) 25 250. Iib nA. Tmin Tamb Tmax 400. Large signal voltage gain Avd 25 200 V/mV. (VCC = 15 V, RL = 15 k , Vo = 1 to 11 V). Supply current (all comparators ). ICC VCC = +5 V, no load 2 mA. VCC = +30 V, no load Vid Differential input voltage (3) VCC+ V. Low level output voltage VOL Vid = -1V, Isink = 4 mA 250 400 mV. Tmin Tamb Tmax 700. High level output current IOH (VCC = Vo = 30 V, Vid = 1 V) nA. Tmin Tamb Tmax 1 A. Isink Output sink current (Vid = -1 V,Vo = V) 6 16 mA. Small signal response time(4). tres s (RL = k connected to VCC+). Large signal response time(5). TTL input (Vref = + V, RL = k to trel VCC+).

6 Output signal at 50% of final value 500 ns Output signal at 95% of final value 1 s 1. At output switch point, VO V, RS = 0 with VCC+ from 5 V to 30 V, and over the full input common- mode range (0 V to VCC+ V). 2. The direction of the input current is out of the IC due to the PNP input stage. This current is essentially constant, independent of the state of the output, so there is no loading charge on the reference of input lines. 3. The response time specified is for a 100 mV input step with 5 mV overdrive. 4. Positive excursions of input voltage may exceed the power supply level. As long as the other voltage remains within the common-mode range, the comparator will provide a proper output state. The low input voltage state must not be less than V (or V below the negative power supply, if used). 5. Maximum values are guaranteed by design. 4/17 Doc ID 2468 Rev 7.

7 LM2901 Electrical characteristics Figure 3. Supply current vs. supply voltage Figure 4. Input current vs. supply voltage Figure 5. Output saturation voltage vs. Figure 6. Response time for various input output current overdrives - negative transition Figure 7. Response time for various input overdrives - positive transition Doc ID 2468 Rev 7 5/17. Typical application schematics LM2901. 4 Typical application schematics Figure 8. Basic comparator Figure 9. Driving CMOS. 5V. VCC = 5 V. 15 k 100 k . +V(ref). +V(ref). 1/ 4 &. 1/4 LM2901. LM2901 VO. -V(ref). -V(ref). Figure 10. Driving TTL Figure 11. Low frequency op-amp 5V. 5V. 15 k . 10 k 1/4. LM2901. +V(ref) ~ el 1/ 4 & eo LM2901. -V(ref). 100 k F. & 1 k . AV = 100. Figure 12. Low frequency op-amp with boost Figure 13. Transducer amplifier 5V 5V. (eo = 0 V for el = 0 V). 15 k Magnetic pick-up 10 k 3 k . 1/ 4. LM2901 2N 2222 1/ 4.

8 ~ el LM2901 eo F. 20 M . 100 k . eo 1 k 10 k . AV = 100. 6/17 Doc ID 2468 Rev 7. LM2901 Typical application schematics Figure 14. Low frequency op-amp with Figure 15. Zero crossing detector (single offset adjust power supply). 5V. 5V. Offset adjust 100 k . 5V. 100 k 100 k k . R2 1 M 1 M . k k . RS R1. 15 k el 1/ 4 1/ 4. el ~ LM2901 2N 2222 LM2901. 1N4148. F. R1. 100 k . 1 k 20 M . eo 10 k . Figure 16. Limit comparator Figure 17. Split-supply applications - zero crossing detector VCC (12 V) 15 V. 2RS 10 k . V(ref). high 1/ 4 k . LM2901. Lamp RS. 1/4. LM2901. eo eI ~. eI ~. 1/ 4. LM139 2N 2222. 2RS. V(ref). low 15 V. Figure 18. Crystal controlled oscillator Figure 19. comparator with a negative reference VCC = 15 V 15 V. 200 k 2 k . 100 k . k . VCC. 1/ 4. 0. F LM2901 eo 1/ 4. LM2901. eo eI ~. f = 100 kHz 200 k 5V. 15 V. Doc ID 2468 Rev 7 7/17. Typical application schematics LM2901.

9 Figure 20. Time delay generator VC C = +15 V. 10 k 15 k 200 k 3 k . 10 M . 10 k . 1/4 VCC. LM2901. V03. V3 to t3. 3 k . 10 M . 10 k 51 k . VC1 10 k . 1/4. VCC LM2901. 1/4. 0. to tA LM2901 VO2 VCC. V2. V(ref.) to t2. Input gating signal F. 3 k . VCC. 10 M . 51 k . 10 k . 1/4. V3 LM2901 V VCC. VC1 V2 O1. V1 t0 t1. V1. 0 t t 0 t1 t2 t3 t4 51 k . Figure 21. Two-decade high-frequency VCO. VCC 100 k VCC. 100 k . 500 pF 3 k 3 k . 1/ 4 k . Frequency control 10 k LM2901. voltage input 1/ 4. Vcontrol F LM2901 Output 1. F. VCC /2. 20 k . Output 2. 50 k 20 k . VCC /2. 1/ 4. LM2901. VCC = + 30 V. +250 mV Vcontrol +50 V. 700 Hz fo 100 kHz 8/17 Doc ID 2468 Rev 7. LM2901 Package information 5 Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK.

10 Specifications, grade definitions and product status are available at: ECOPACK is an ST trademark. Doc ID 2468 Rev 7 9/17. Package information LM2901. DIP14 package information Figure 22. DIP14 package mechanical drawing Table 4. DIP14 package mechanical data Dimensions Millimeters Inches Ref. Min. Typ. Max. Min. Typ. Max. A A1 A2 b b2 c D E E1 e e1 eA eB L 10/17 Doc ID 2468 Rev 7. LM2901 Package information QFN16 3 x 3 package information Figure 23. QFN16 3 x 3 mm package mechanical drawing Doc ID 2468 Rev 7 11/17. Package information LM2901. Table 5. QFN16 3 x 3 mm package mechanical data (pitch mm). Dimensions Ref. Millimeters Inches Min. Typ. Max. Min. Typ. Max. A A1 0 0 A3 b D D2 E E2 e L Figure 24. QFN16 3 x 3 mm footprint recommendation 12/17 Doc ID 2468 Rev 7. LM2901 Package information SO-14 package information Figure 25. SO-14 package mechanical drawing Table 6.