BA7655A 查看數據表（PDF） - ROHM Semiconductor

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BA7655A

Dual Voltage-controlled Amplifier

ROHM Semiconductor 

Multimedia ICs

BA7655A / BA7655AF

•Electrical characteristics (unless otherwise noted , Ta = 25°C , VCC = 5.0V)

Parameter

Symbol Min. Typ. Max. Unit Voltage

Conditions

Supply current

One channel

Both channels

ICC1

ICC2

— 4.6 7.0

mA

— 7.8 12.0

3.0

Set control voltage to 1V or less,

when only one channel is used.

Maximum output voltage

VMax. 2.5 2.8 — VP-P

5.0 f = 1kHz, THD = 1%

Frequency characteristics

Gf – 1.0 0.0 1.0 dB

3.0 f = 13MHz / 1MHz, VIN = 0.5VP-P

Minimum voltage gain

GVMin. – 8.0 – 6.0 – 4.0 dB

2.0 f = 1MHz

Maximum voltage gain

GVMax. 4.0 6.0 8.0 dB

5.0 f = 1MHz

Secondary harmonic distortion

2HD — – 40 — dB

3.0 f = 5.0M, VIN = 1VP-P

Audio distortion

AD

— 1.0 —

%

3.0 f = 1kHz, VIN = 1VP-P

Muting output voltage

VMUTE — — 100 mV

1.0 Set control voltage to 1 V or less

Video

S/N ∗

V S / N — – 60 — dB

3.0

Audio

S/N ∗

A S / N — – 60 — dB

3.0

∗ Items marked with an asterisk are rerference values.

᭺ Not designed for radiation resistance.

•Circuit operation

The gain of a VCA (voltage-controlled amplifier) can be

varied by an external control voltage. By varying the

control voltage from 2V to 5V (in the case of a 5V

power supply), the gain of the amplifiers in this IC can

be varied over the range -6dB to +6dB (see Figs. 1

and 2 below).

When only one of the two amplifiers is being used, by

setting the voltage on the CTL pin of the unused ampli-

fier to 1V or less, it can be put into Power Save Mode.

In Power Save Mode, the circuit current for the IC is

cut by 40%, and the output is muted.

8

6

POWER SAVE MODE

4

2

0

–2

–4

–6

–8

– 10

– 12

– 14

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

Control voltage (V)

Fig. 1 Voltage gain vs.

control voltage characteristics

IN

VCA

OUT

Control voltage

CTL Voltage

2V ~ 5V Variable gain

1V or less Power save

Status

Fig. 2

3

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