STV8224B datasheet(4/12 Pages) STMICROELECTRONICS

4 / 12 page

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

Test Conditions

Min.

Typ. Max.

Unit

AGC CIRCUIT (L MODE)

I22CL

Charging Current

Note 3

3.3

4.5

I22DL

Discharge Current

0.3

µA

I22CL+

Additional Charging Current

L in case of missing, VITS Pulses

and no White in Video Content

µA

Threshold Voltage Level for

Additional Charging Current

Refered to Pin 3

2.75

I22DL+

Additional Discharging Current

µA

Threshold Voltage Level for

Additional Discharging Current

Refered to Pin 3

2.25

TUNER AGC

I23

Maximum Sinked Current

1.5

2.5

S23

Current Slope

R24 =5k

Ω

100

170

230

µA/dB

I23+

Maximum Tuner Plus Sinked

Current

Note 4

FM SOUND DEMODULATION

V8S

Input Sensitivity

150

µVRMS

Limiter Input Resistance

600

Ω

DC Voltage (Pin 8)

4.2

AMR

Amplitude Modulation Rejection

Note 5

SVR

Supply Voltage Rejection Ratio

Ripple signal : 100Hz, 0.5VPP

V15

Detected Audio Output Signal

0.85

1.1

1.4

VRMS

THD

Total Harmonic Distortion

0.2

R15

Internal Deemphasis Resistor

600

750

900

Ω

S/N

Signal to Noise Ratio

See Note 6,

Weighted CCIR 468-4,

(quasi peak level) input Pin 8

Black Picture (sync only)

Measurement between I F input

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

SAW : K2955

BPF : SFE5.5MB

White Picture

250kHz Square Wave

VOLUME CONTROL

VC Range

Control Range

See Figure 22

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%

= 20 log

V15

(mVRMS)

(mVRMS

)

(dB)

STV8224B

4/12

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