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LT1499 Datasheet(PDF) 11 Page - Linear Technology |
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LT1499 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  11 LT1498/LT1499 TYPICAL PERFORMANCE CHARACTERISTICS APPLICATIONS INFORMATION Rail-to-Rail Input and Output The LT1498/LT1499 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) which are active over different ranges of input com- mon mode voltage. A complementary common emitter output stage (Q14/Q15) is employed allowing the output to swing from rail-to-rail. The devices are fabricated on Linear Technology’s proprietary complementary bipolar process to ensure very similar DC and AC characteristics for the output devices (Q14/Q15). The PNP differential input pair is active for input common mode voltages, VCM, between the negative supply to approximately 1.3V below the positive supply. As VCM moves further 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 differential pair becomes inactive for the rest of the input common mode range up to the positive supply. The output is configured with a pair of complementary common emitter stages that enables the output to swing from rail to rail. Capacitors C1 and C2 form local feedback loops that lower the output impedance at high frequencies. 5V Small-Signal Response 200ns/DIV VS = 5V AV = 1 VIN = 20mVP-P AT 50kHz RL = 1k 1498/99 G27 ±15V Small-Signal Response 200ns/DIV 1498/99 G29 VS = ±15V AV = 1 VIN = 20mVP-P AT 50kHz RL = 1k 5V Large-Signal Response 2 µs/DIV VS = 5V AV = 1 VIN = 4VP-P AT 10kHz RL = 1k 1498/99 G28 ±15V Large-Signal Response 2 µs/DIV VS = ±15V AV = 1 VIN = 20VP-P AT 10kHz RL = 1k 1498/99 G30 |
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