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LT1630CN8 Datasheet(PDF) 11 Page - Linear Technology |
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LT1630CN8 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  11 LT1630/LT1631 TYPICAL PERFORMANCE CHARACTERISTICS Harmonic Distortion vs Frequency FREQUENCY (kHz) 100 0 –20 –40 –60 –80 –100 1000 1630/31 G30 1000 200 500 3RD 2ND 2ND 3RD VS = 5V, 0V AV = 1 VIN = 2VP-P RL = 150Ω RL = 1k Harmonic Distortion vs Frequency 5V Large-Signal Response 1630/31 G27 VS = 5V, 0V AV = 1 RL = 1k 5V Small-Signal Response 1630/31 G26 VS = 5V, 0V AV = 1 RL = 1k FREQUENCY (kHz) 100 0 –20 –40 –60 –80 –100 1000 1630/31 G31 1000 200 500 3RD 2ND 3RD VS = 5V, 0V AV = –1 VIN = 2VP-P RL = 150Ω RL = 1k 2ND ±15V Small-Signal Response VS = ±15V AV = 1 RL = 1k ±15V Large-Signal Response 1630/31 G29 VS = ±15V AV = 1 RL = 1k 1630/31 G28 APPLICATIONS INFORMATION Rail-to-Rail Input and Output The LT1630/LT1631 are fully functional for an input and output signal range from the negative supply to the posi- tive supply. Figure 1 shows a simplified schematic of the amplifier. The input stage consists of two differential amplifiers, a PNP stage Q1/Q2 and an NPN stage Q3/Q4 that are active over different ranges of input common mode voltage. The PNP differential input pair is active for input common mode voltages VCM between the negative supply to approximately 1.4V below the positive supply. As VCM moves closer toward the positive supply, the transistor Q5 will steer the tail current I1 to the current mirror Q6/Q7, activating the NPN differential pair and the PNP pair becomes inactive for the rest of the input com- mon mode range up to the positive supply. The output is configured with a pair of complementary common emitter stages Q14/Q15 that enables the output to swing from rail to rail. These devices are fabricated on Linear Technology’s proprietary complementary bipolar process to ensure similar DC and AC characteristics. Capacitors C1 and C2 form local feedback loops that lower the output impedance at high frequencies. |
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