TDA7421 datasheet(10/38 Pages) STMICROELECTRONICS

Il numero della parte	TDA7421

Spiegazioni elettronici	AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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10 / 38 page

ELECTRICAL CHARACTERISTICS (continued)

Adjacent Channel Station Detector

Ref: FM Test Circuit, measure:

- Input at VFMLIMIN: desired 10.7MHz, 95dBu CW; undesired 10.8MHz CW

- output at VFMSD

- FMRECSEEK set to 1

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

ACSDMAX

Adjacent Channel Detector

Maximum Sensitivity Threshold

amplitude of undesired signal at

which VFMSD = 2.5V, HDM4-0 set

to 11111

92.5

dBu

ACDMIN

Adjacent Channel Detector

Minimum Sensitivity Threshold

amplitude of undesired signal at

which VFMSD = 2.5V, HDM4-0 set

to 00000

94.9

dBu

AM Section Global Performances

Refer to Evaluation Circuit and enclosed curves (S+N/N, THD)

- RF Input: fc = 1MHz, f mod = 1KHz, m = 0.3;

- Audio Output: BPF 20Hz - 20KHz

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

VIN MIN

Maximum Sensitivity

VINRF = 74dBu;

∆VAF = - 20dB

20

dBu

VIN US

Usable Sensitivity

S+N/N = 20dB

31

dBu

∆Vis

AGC Range

VINRF = 74dBu;

∆VAF = -10dB

50

dB

S+N/N

Signal to Noise Ratio

VINRF = 74dBu

46.0

53.0

dB

αIMAG

Image Rejection

f1 = 1.9MHz

f2 = 22.4MHz

dB

αTw

VINRF = 74dBu; f1 = 900KHz;

f2 = 1350KHz

1.2

dB

THD

Total Harmonic Distortion

VINRF = 74dBu; m = 0.3

0.45

1.0

%

VINRF = 74dBu; m = 0.8

1.73

%

VINRF = 120dBu; m = 0.3

0.33

%

VAF

Audio Output Level

VINRF = 74dBu

137

167

197

mVRMS

VAMST

AM IF2 Output level

VINRF = 74dBu

106

dBu

AM Mixer 1

Ref: AM Test Circuit, measure input at VMIX2AMIN, output at VMIXOUT

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

RINMIX1

Input Resistance

1.2

K

Ω

GMIX1

Conversion Gain

fIN = 1MHz

7.5

8.5

9.5

dB

IP3MIX1

3rd Order Intermodulation

Distortion Intercept Point

fd = 1MHz; fu1 = 1.1MHz;

fu2 = 1.2MHz;

115

dBu

CP1MIX1

1dB Compression Point

fIN = 1MHz

98.7

dBu

TDA7421

10/38

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