S4308 KODENSHI | Alldatasheet

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Technical content

◈ Description The S4308 is a single preamplifier IC with built-in ALC circuit, and has been designed for use in stereo radio-cassette recorders and tape recorders. The preamplifier has high gain and low distortion, and can be directly coupled to the tape head without coupling capacitors. This prevents tape head magnetization and pop noise generation. A built-in rectifier means that an ALC dynamic range can be constructed with addition of just an external time constant circuit. The IC also includes power-on mute circuits that suppress pop noise generation. ◈ Features

  • Built-in ALC rectifier diode
  • Wide operating power supply voltage range (VCC=5V to 14V)
  • Low current dissipation (IQ=2.1mA)
  • High gain (GVO=80dB)
  • Low distortion (THD=0.1%)
  • Low noise (VNIN=1μVrms)
  • Input coupling capacitor unnecessary.
  • Power-on mute circuit.
  • ALC dynamic range can be varied by the addition of an external input resistor. ◈ Applications
  • Stereo radio cassette recorders, cassette decks and home stereo systems and music centers. ◈ Ordering Information Type NO. Marking Package Code S4308 308 □ ྙ ྚ SOT-26 ཛDevice Code ཛྷYear&Week Code ◈ Absolute Maximum Ratings Characteristics Symbol Value Unit Power Dissipation Pd 200 ΞΈ Operating Ambient Temperature Ta ͣ͞5 ~ 75 ℃ Storage Temperature Tstg -55 ~ 125 ℃ Maximum Supply Voltage Vcc(max) ͢5 · SSeemm iiccoonndduuccttoorr

◈ Recommended Operating Conditions Parameter Symbol Min Max Unit Power Supply Voltage Vcc 5 14 · ◈ Electrical Characteristics (Ta = 25℃͝ ·ʹʹ=7͝ f=͢kHz aΟd ͳPF : ͣ͡Hz tΠ ͣ͡kHz) Characteristics Symbol Test Condition Min. Typ. Max. Unit Quiescent Current IQ VIN=0Vrms 1.2 2.1 3 mA Open Loop Voltage Gain GVO VOUT=-10dBV(=0.316Vrms) 70 80 dB Close Loop Voltage Gain GVC VOUT=-10dBV, f=1kHz 31 34 37 dB Total Harmonic Distortion THD NAB 34dB, VOUT=40mVrms - 0.1 0.3 % Input Resistance RIN - 15 25 45 kΩ Maximum Output Voltage VOM THD=1% 0.6 1.2 - Vrms Input Conversion Noise Voltage VNIN Conversion with Rg=2.2kΩ and NAB 34dB at 1kHz - 1.0 2.0 uVrms ALC Range ALC Rg=3.9kΩ, VIN=-70dBV Reference, THD=3% 40 45 - dB ◈ Schematic Diagram Pin Symbol Description

1 NF Preamplifier -input

2 GND Ground

3 INPUT Preamplifier +input

4 OUTPUT Preamplifier Output

5 ALC Automatic

6 VCC Supply Voltage

◈ Application Example ◈ Operation notes 1)Recording amplifier (Fig.1) - Input coupling capacitor C1 is not required. - Voltage gain : Gv = R3/R2 - “POP” noise is prevented by DC blocking capacitor C2 connected to pin1. 2) ALC (Automatic Level Control) - The operating point of the S4308 output stage is fixed at 2.1V - When the signal output voltage is 0.75Vrms, the ALC starts operating. - Input signals is attenuated by the ratio of the electronic potentiometer resistance(RIN) and the external resistor R1. - The range of the ALC can be varied by the value of R1. - R1 is too large the S/N ratio will worsen. (Sufficient R1 value is several k ohms) - R4 and C4 connected to pin 5 set the ALC attack and recovery times. the larger the value of time constant, the longer the recovery time, and the smaller the value of C4 the shorter the attack time. For NAB equalizer amplifier 1) Instead of R3. 2)Connect the circuit Between pin 4 and pin 1.

3) NAB equalizer amplifier (Fig.2) - During playback, the S4308 amplifier is used as NAB equalizer amplifiers. - Voltage gain : GV = |R8 + R7 / (1 + jω C7 * R7)| / R2 - The output stage (pin 4) operating point is fixed at 2.1V - Max output voltage : 1.2Vrms(typ). - ALC circuit is not required for playback.(pin 5 is grounded). <Fig. 2> <Fig. 1> RECORDING AMPLIFIER NAB EQUALIZER AMPLIFIER OPERATION CIRCUIT OPERATION CIRCUIT

56789 1 0 1 1 1 2 1 3 1 4 1 5 Quiescent Current IQ [mA] Power Supply Voltage Vcc [V] -50 - 250 2 55 07 5 1 00 Quiescent Current IQ [mA] Ambient Temperature Ta [℃] Vcc=7V 0.01 0.1 1 10 100 Frequency f [khz] Voltage Gain Gv [dB] GVO NAB VCC=7V RL=10K Ω 0.5 1.5 2.5 2.533 .544 .555 .5 Output Voltage VOUT [V] Mute ON/OFF Voltage Vcc [V] Mute ONMute OFF -50 -25 0 25 50 75 100 Ambient Temperature Ta [℃] ALC range [dB] VCC=7V f=1KHz RL=10K Ω -50 -25 0 25 50 75 100 Ambient Temperature Ta [℃] Close Loop Voltage Gain GVC [dB ] VCC=7V f=1KHz RL=10K Ω NAB ◈ Electrical Characteristic Curves Fig. 2 IQ – Ta Fig. 1 IQ – VCC Fig. 3 Gv – f Fig. 4 VOUT – VMUTE Fig. 6 GVC – Ta Fig. 5 ALC range – Ta

0.2 0.4 0.6 0.8 1.2 1.4 0 2 4 6 8 10 12 14 16 18 20 Power Supply Voltage Vcc [V] Maximum Output Voltage VOM [Vrms] f=1KHz RL=10K Ω 0 2 4 6 8 10 12 14 16 18 20 Power Supply Voltage Vcc [V] Voltage Gain Gv [dB] f=1KHz RL=10K Ω NAB S4308 ◈ Electrical Characteristic Curves Fig. 8 GV – VCC Fig. 7 VOM – VCC

Outline Dimension(mm)

The AUK Corp. products are intended for the use as components in general electronic equipment (Office and co mmunication equipment, m easuring equipment, home appliance, etc.). Please make sure that you consult with us before you use these AUK Corp. products in equipments which require high quality and / or reliability, and in equipments which could have major impact to the welfare of human life(atomic energy control, airplane, spaceship, transportation, combustion control, all types of safety device, etc.). AUK Corp. cannot accept liability to any damage which may occur in case these AUK Corp. products were used in the mentioned equipments without prior consultation with AUK Corp.. Specifications mentioned in this publication are subject to change without notice.