LT1631CS datasheet(14/20 Pages) LINER

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LT1630/LT1631

16301fa

Typical perForMance characTerisTics

Harmonic Distortion vs Frequency

5V Small-Signal Response

5V Large-Signal Response

FREQUENCY (kHz)

100

–20

–40

–60

–80

–100

1000

1630/31 G30

200

500

3RD

2ND

3RD

VS = 5V, 0V

AV = 1

VIN = 2VP-P

RL = 150

RL = 1k

VS = 5V, 0V

AV = 1

RL = 1k

163031 G26

VS = 5V, 0V

AV = 1

RL = 1k

163031 G27

Harmonic Distortion vs Frequency

±15V Small-Signal Response

±15V Large-Signal Response

FREQUENCY (kHz)

100

–20

–40

–60

–80

–100

1000

1630/31 G31

200

500

3RD

2ND

3RD

VS = 5V, 0V

AV = –1

VIN = 2VP-P

RL = 150

RL = 1k

2ND

VS = ±15V

AV = 1

RL = 1k

163031 G28

VS = ±15V

AV = 1

RL = 1k

163031 G29

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 am-

plifiers, 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 transis-

tor 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 common

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. Ca-

pacitors C1 and C2 form local feedback loops that lower

the output impedance at high frequencies.

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