Gennum Corporation LD505, LC505 Datasheet



GENNUM

C O R P O R A T I O N 

High Gain Class A Amplifier

LC505/LD505 DATA SHEET

FEATURES

• 71 dB of gain with 1.3 V supply

• 0.2 to 2.0 mA of transducer current adjustment

• 43 dB of volume control range

• 1.0 to 1.6 V supply operating range

• 2.2 k

Ω internal decoupling resistor for microphone

bias (LD505 only)

• output limiting capabilities (LD505 only)

STANDARD PACKAGING

• MINIpac P6 (LC505)

• MINIpac P8 (LD505)

DESCRIPTION

The LC/LD505 are low voltage, linear monolithic integrated
amplifiers with a typical electrical gain of 71 dB. The circuits
are comprised of a compensated, unconditionally stable,
operational amplifier and a low distortion Class A single
transistor output stage with negative feedback for stability
over a wide temperature range.

Current trimming in the output stage for inductive or resistive
loads can be accomplished by connecting an emitter resistor
from RE to ground. The LC/LD505 can operate over a supply
voltage range of 1.0 to 1.6 DC.

The LD505 which is an eight pin device, has an internal 2.2 kΩ
decoupling resistor for microphone bias providing increased
supply line rejection. The base of the output transistor is also
accessible allowing connection of diodes in a feedback
configuration for peak limiting.

VB

3

2

IN

NOT RECOMMENDED

5

VC

4

All resistors in ohms, all capacitors in
microfarads unless otherwise stated

Revision Date: January 1996

GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. [phone] fax: [phone]

Japan Branch: A-302, M iyamae Village, 2–10–42 M iyamae, Suginami–ku, Tokyo 168, Japan tel. [phone] fax [phone]

+

-

FOR NEW DESIGNS

100

LC505 BLOCK DIAGRAM

33k

200

GND

RE

OUT

16

1

IN

VC

MIC

BIAS

6

5

All resistors in ohms, all capacitors in
microfarads unless otherwise stated

+

-

100

LD505 BLOCK DIAGRAM

2.2k

GND

VB 

LIMITER

1

48

33k

200

RE

Document No. 500 - 15 - 09

3

OUT

27

500 - 15 - 09

ABSOLUTE MAXIMUM RATINGS

PIN CONNECTION

PARAMETER VALUE & UNITS

V

3

B

VC

4

Supply Voltage 3 V

OUT

IN

Operating Temperature -10 to +40 °C

Power dissipation 25 mW

R

1

E

GND

6

LC505

CAUTION

CLASS 1 ESD SENSITIVITY

V

OUT

LIMITER

4

B

R

E

1

5

VC

IN

GND

MIC

8

BIAS

LD505

ELECTRICAL CHARACTERISTICS

All switches remain as shown in test circuit unless stated in condition column
Conditions: Temperature 25

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Gain A

Temperature Coefficient of Gain η

Amplifier Current I

Temperature Coefficient of Current η

Transducer Current I

Total Harmonic Distortion

Input Referred Noise Bandwidth at 12 dB/OCT - 0.2 to 10 kHz - 1.2 2.0 µVRMS

o

C, Vcc = 1.55 V

68 72 76 dB

V

A

V

= 1.3 V 66 71 76 dB

CC

- 0.07 - dB/oC

- 0.21 0.28 mA

A

Ι

Vcc = 1.3 V - 0.16 0.23 mA

- -0.002 - mA/oC

1.3 1.5 1.9 mA

L

Vcc = 1.3 V 1.0 1.3 1.7 mA

-25%

V

= 1.3 V - - 6 %

cc

Battery Resistance Stability RVC = 100k (S1-open) 22 - - Ω

Input Impedance

LC505 - 8 - kΩ
LD505 - 27 - kΩ

Low - 100 - Hz

Frequency Response (-3 dB)

High - 5000 - Hz

RVC = 0 to 100kΩ 36 43 - dB
(S1 - closed/open)

Volume Control Range RVC = 0 to 100kΩ 34 42 - dB

(S1 - closed/open) Vcc = 1.3 V
LC505 - -0.4 - dB/Ω

Gain Dependance of RB

500 - 15 - 09

LD505 - +0.16 - dB/Ω

2