STV8224B Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

STV8224B

MULTISTANDARD VIDEO AND SOUND IF SYSTEM WITH AUDIO AND VIDEO SWITCHES

STMicroelectronics 

STV8224B

ELECTRICAL CHARACTERISTICS (continued)

(Tamb = 25°C, VCC = 9V, IF input = 10mVRMS sync level at B/G, Peak-white level at L,

Video modulation DSB, D = 90% at B/G, D = 95% at L, fPC = 38.9MHz, fSC = 33.4MHz,

Video BW = 5MHz, Sound carrier input : 5.5MHz, 10mVRMS, fM = 1kHz, Audio BW = 20kHz, ∆f = ±50kHz,

Volume attenuation = 0dB, unless otherwise specified)

Symbol

Parameter

AGC CIRCUIT (L MODE)

I22CL

I22DL

I22 CL+

Charging Current

Discharge Current

Additional Charging Current

I22 DL+

Threshold Voltage Level for

Additional Charging Current

Additional Discharging Current

Threshold Voltage Level for

Additional Discharging Current

TUNER AGC

I2 3

Maximum Sinked Current

S23

Current Slope

I23+

Maximum Tuner Plus Sinked

Current

FM SOUND DEMODULATION

V8S

R8

AMR

SVR

V15

THD

R15

S/N

Input Sensitivity

Limiter Input Resistance

DC Voltage (Pin 8)

Amplitude Modulation Rejection

Supply Voltage Rejection Ratio

Detected Audio Output Signal

Total Harmonic Distortion

Internal Deemphasis Resistor

Signal to Noise Ratio

Black Picture (sync only)

White Picture

250kHz Square Wave

Test Conditions

Min. Typ. Max. Unit

Note 3

L in case of missing, VITS Pulses

and no White in Video Content

Refered to Pin 3

Refered to Pin 3

2 3.3 4.5 mA

0.3

µA

5

µA

2.75

V

28 40 56 µA

2.25

V

R24 = 5kΩ

Note 4

1.5 2 2.5 mA

100 170 230 µA/dB

40

mA

150

µVRMS

600

Ω

4.2

V

Note 5

50 61

dB

Ripple signal : 100Hz, 0.5VPP

28 33

dB

0.85 1.1 1.4 VRMS

0.2 1

%

600 750 900 Ω

See Note 6,

55 60

dB

Weighted CCIR 468-4,

(quasi peak level) input Pin 8

Measurement between IF input 47 52

dB

(Pins 19-20) and audio output (Pin 15)

SAW : K2955

46

50

dB

BPF : SFE5.5MB

47 52

dB

VOLUME CONTROL

VC Range Control Range

See Figure 22

72 77

dB

Notes : 3. Triggered on white level

4. Additional sinked current for large increasing steps of input signal when :

- Voltage Pin 22 > starting point defined Pin 24.

- Output signal (Pin 3) saturated (V3 < V BTH in BG mode, V3 > V WTH in L mode).

5.

AMR

=

20

log

V15 (mVRMS)

VAM

(dB)

where

VAM

=

output amplitude

in

AM

for

fM

=

1kHz

and

m

=

30%

6.

S

N

=

20

log

V15 (mVRMS)

VN (mVRMS)

(dB)

4/12

Share Link: