ELECTRICAL CHARACTERISTICS

Symbol

Parameter

Test Conditions

Min.

Typ. Max.

Unit

MICROPHONE PREAMPLIFIER

Bias Audio Voltage

Pin 26

3.8

V

IN_ref

Micro Input Voltage

Pin 33

2

V

Input Impedance

Pin 33

50

k

Ω

Overall Gain

AGC Mode off

48

50

52

dB

Overall Gain

AGC Mode on

54

56

20

58

34

dB

dB

ALC1

ALC2

Regulated Output Level

AGClevel (Pin 39) = 0

AGClevel (Pin 39) = 5

1.1

0.7

1.5

1

1.9

1.3

Ich

AGC Charge Current

On Pin 29 when signal out above threshold

500

µA

Idis

AGC Discharge Current

All the time with AGC on

-1

µA

Output Response Time

µF5

ms

Output Response Time

µF

2.5

s

OUT_Max Output Clipping Level

Pins 30/31

1.7

1.7

2

2

OUT_DC

Output DC Voltage

Pins 30/31

2.1

V

OUT_OF

Channel DC Mismatch

Pins 30/31

-350

0

350

mV

Output Impedance

Pins 30/31

100

Ω

THD

Overall THD

0.15

0.4

%

PSRR

60

dB

CMRR

60

dB

LFc

Low Cut-off Frequency

250

Hz

HFc

High Cut-off Frequency

20

kHz

Xtalk

Xtalk from video to audio

Measure on Pins 30/31, compared to Pin 38 (2)

60

dB

Notes : 2. On a 20Hz to 10MHz frequency range, with 10

µF filtering capacitors on all supplies, and well splitted supplies and grounds.

INPUT

OUTPUT

+6dB

-6dB

t

DEC

t

ATT

Figure 7

STV0502

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