Philips Semiconductors

Application note

 

 

 

Using the NE/SA5234 amplifier

AN1651

 

 

 

configuration and its output is squared to swing approximately 5V, the standard TTL level. Again common-mode biasing is passed along from each of the stages up to the last in order minimize parts and simplify circuit layout. The final stage is a simple buffer amplifier to allow the receiver to drive a low impedance long wire line of 600Ω to 900Ω resistance. Some rise time response adjustment may be required. This is easily achieved following stage three by using RT-CTto limit the rate of change of the signal voltage prior to the buffer. Note that the last stage acts as a zero-crossing detector. This maximizes noise immunity by allowing a transition only after the third stage output voltage has risen above 2/3VCC. Phase inversion may be accomplished, if the logic level signals are polarity reversed, by making stage 3 inverting and AC coupling the input signal with a sufficiently large capacitor to reduce droop. Stage 3 must then be biased by connecting its non-inverting node to bias point `A'. This provides a 2.5V threshold for the proper

switching operation of the stage. However, care must be taken not allow the network's time constant to become code dependent as to the average low frequency signal components or errors will result in the output signal.

The advantage of this particular circuit is that it has the simplicity of single supply operation along with the capability of a large output swing making it fully TTL compatible

REFERENCES:

Philips Semiconductors. Linear Data Manual, Volume 2 : Industrial.

Sunnyvale: 1988.

Wong, Alvin K. Companding with the NE577 and NE578..Philips Semiconductors Applications Note AN1762 : September 1990.

 

 

C1

 

 

 

 

10k

 

 

 

EXPIN

 

 

 

GAINCELL

 

 

 

 

+

 

 

1

10k

 

 

 

 

 

 

10μF

 

ΔG

Σ

 

 

 

 

 

R1*

 

RECT.

10k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

5k

 

 

 

 

 

 

RECTIN

 

 

 

 

 

 

 

 

 

 

 

 

 

EXPCAP

 

 

 

3

 

30k

30k

10k

 

 

 

 

 

 

 

+

 

 

 

 

 

 

 

 

C2

2.2μF

 

 

 

 

 

 

 

 

 

 

C3

 

 

EXPANDOR

 

 

 

 

 

 

+

 

4

 

 

 

 

 

EXPOUT

10μF

 

 

 

Σ

 

 

 

 

 

 

RECT.

 

 

 

 

 

10k

 

 

 

C4+

 

 

 

 

 

VREF

 

5

 

 

8.6k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10μF

 

 

 

VREF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

BANDGAP

 

 

 

 

 

 

10k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Δ

 

 

 

 

R2*

 

 

 

 

 

I

REF

 

VCC

 

 

COMP.

 

G

 

 

 

 

 

 

 

 

 

 

 

 

PWRDN

 

 

 

GAINCELL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND MUTE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PWRDN/

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

 

 

 

 

 

 

NE578

 

 

 

 

MUTE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*R1, R2 and R3 are 1% resistors.

16

 

 

 

 

VCC

 

 

 

15

 

COMPCAP2

 

 

 

 

 

C8

 

+

 

 

 

 

 

2.2μF

 

 

C7

14+

10μF COMPIN

13

COMPCAP1

 

 

 

 

+C6

12

 

 

 

 

 

 

2.2μF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RECTIN

 

 

 

 

 

R3*

11GCELLIN

10μF +C5

10 C9 10μFCOMPOUT+

 

1nF C11

TO

9

 

+

PIN 4

R4

 

SUMIN

 

C10

 

 

 

 

 

 

 

10μF

 

SL00652

Figure 24. Block Diagram of NE578 Test and Application Circuit

1991 Oct

15

Page 14 Page 16
Page 15
Image 15
Philips AN1651 manual References, NE578
Page 14 Page 16

AN1651 specifications

The Philips AN1651 is a highly regarded car audio speaker offering an impressive balance of sound quality and performance. Designed primarily for the car audio enthusiast, this model showcases what modern engineering can achieve in automotive sound systems.

One of the main features of the AN1651 is its dual cone structure that produces clear and rich sound across various frequencies. This design aims to enhance both low and mid-range sounds, ensuring that music is delivered with clarity and precision. Whether you're listening to rock, pop, or classical, the AN1651 is built to convey the nuances of music effectively.

The speaker boasts a peak power handling capability of up to 240 watts, which allows for immersive sound experiences without distortion, even at higher volumes. This capability means that the AN1651 can handle the punchy bass lines typical in many contemporary music genres, making it a popular choice among bass enthusiasts.

Philips also incorporates their innovative technologies, such as a reinforced polypropylene cone. This material enhances sound quality by providing better rigidity while remaining lightweight. The result is a responsive speaker with reduced resonance, contributing to more accurate audio playback. Furthermore, the butyl rubber surround is designed to withstand wear and tear, ensuring durability and longevity in automotive conditions.

The AN1651 also features a sensitivity rating of 91 dB, allowing it to produce powerful sound output even with moderate power input. This feature makes it an ideal choice for vehicles with smaller amplifiers or factory stereo units, as it ensures an enjoyable listening experience without requiring significant upgrades.

In terms of installation, the AN1651 is designed for versatility. Its size makes it compatible with a wide range of vehicles, and the mounting accessories included facilitate an easy and secure fit.

With a smart aesthetic that blends well with various car interiors, the Philips AN1651 speaker is more than just a functional audio component; it is a stylish addition to your vehicle.

In conclusion, the Philips AN1651 combines advanced technologies and thoughtful design to deliver a rich audio experience that car enthusiasts will appreciate. Whether for casual listening or serious audio enjoyment, this speaker meets diverse audio needs, proving to be a valuable investment for any car audio system.
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