LS509 查看數據表（PDF） - Gennum -> Semtech

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LS509

Class A Amplifier with 3 Gain Blocks & Schottky Diodes

Gennum -> Semtech 

VB = 1.3 V DC

RS ≈ 3k9

7 RMIC

1µ0

CS

0µ22

-A

6

5

8

-B

4

9

50k

21k

0µ1

RMPO

ED1913

RLAC

-C

10

2

RE

3

1

0µ1

56

100k

100k

RGT 0µ1 5k6

All resistors in ohms, all capacitors in farads unless otherwise stated.

RVC

Gain of Stage A = 20 log

RGT

RS

Gain of Stage B = 20 log

RVC

5.6 k

Gain of Stage C = 20 log

RLAC//21K

56//RE

Fig 3 Typical Hearing Instrument Application

5

-5

-15

-25

-35

-45

-55

-65

-75

-140

RVC = 100K

RVC = 47K

RVC = 10K

RVC = 3.3K

RVC = 22K

-120

-100

-80

INPUT (dBV)

-60

-40

Fig. 4 I/O Curves at Various RVC Settings

4

CS = 0.22µ

0

CS = 0.1µ

-4

CS = 0.033µ

-8

CS = 0.047µ

-12

-16

-20

20

200

2k

20k

FREQUENCY (Hz)

Fig. 6 Closed Loop Frequency Response

with Various CS Values

510 - 12 - 08

4

0

-2

-4

-6

-8

-10

-12

-14

-16

-18

-20

-90

-80

RMPO = 50k

RMPO = 22k

RMPO = 10k

RMPO = 0k

RMPO = 3.3k

-70

-60

-50

-40

INPUT (dBV)

Fig. 5 I/O Curves at Various RMPO Values

5

0

-5

-10

-15

-20

-25

-30

0.7

0.8

0.9

1

1.1

1.2

1.3

1.4

SUPPLY VOLTAGE (V)

Fig. 7 Gain vs Supply Voltage

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