GK504 データシートの表示（PDF） - Gennum -> Semtech

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GK504

Low Current Preamplifier with Output Limiting

Gennum -> Semtech 

FEATURES

• designed to drive Class D integrated receivers

• adjustable peak clipper

• low current drain

• low noise and distortion

• low external parts count

• two low noise preamplifiers

• transconductance output stage

• mid supply referenced output

• preamp A for Gain Trim or Telecoil

STANDARD PACKAGING

• 10 pin MICROpac

• 10 pin PLID®

• 10 pin SLT

• Chip ( 56 x 84 mils)

Au Bump

Low Current Preamplifier

with Output Limiting

GK504 - DATA SHEET

DESCRIPTION

The GK504 is Gennum’s proprietary low current preamplifier

designed to drive the Class D series receivers. It consists of

two independent single-ended, low noise inverting amplifiers,

a symmetrical peak clipping, mid-supply referenced,

transconductance output stage, and an on-chip microphone

decoupling resistor.

Blocks A and B typically have an open loop voltage gain of

53 dB, with the closed loop gain set by the ratio of the feedback

resistor to source impedance. It is recommended that the

maximum closed loop gain be 20 dB lower than the open loop

gain. All blocks of the device are internally bias compensated

preventing any DC current flow via external feedback resistors.

Without this compensation, audible scratchiness would be

present during changes in Volume Control settings. It is

acceptable to DC-couple blocks A and B of the device,

however the third stage must be AC coupled in order to

maintain DC bias requirements.

The major advantage of the GK504 over other preamplifiers is

the electronic MPO adjustment. Since conventional MPO is

not possible in the class D receivers, it is provided electronically.

The maximum output swing is easily set using an R resistor.

MPO

The receiver output level is thus limited, preventing it from

exceeding the discomfort level.

VMIC 3

R MIC

AIN 2

A

B

RP1

C

RP2

4 VB

5C

OUT

1

10

A OUT BIN

U.S. Patent No.07/354,327

98

BOUT CIN

7

6

R MPO GND

BLOCK DIAGRAM

Revision Date; May 1998

Document No. 520 - 47 - 05

GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. +1 (905) 632-2996

Web Site: www.gennum.com E-mail: hipinfo@gennum.com

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