TDA7421N Datasheet, PDF (13/38 Pages) STMicroelectronics – AM/FM TUNER FOR CAR RADIO AND HI-FI APPLICATIONS

TDA7421N
ELECTRICAL CHARACTERISTICS (Continued)
AM Mixer 2
Ref: AM Test Circuit; measure input at V_MIX2AMIN, output at V_MIX2OUT (switches must be in position 2 for AGC
measurements).
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
R_IN,MIX2 Input Resistance
5
KΩ
G_MIX2 Maximum conversion Gain
f_IN = 10.7MHz
25
dB
IP3_MIX2 3rd Order Intermodulation
Distortion Intercept Point
CP1_MIX2 1dB Compression Point
f_d = 10.7MHz; f_u1 = 10.8MHz;
f_u2 = 10.9MHz
f_IN = 10.7MHz
117
dBµV
107
dBµV
CAdj2
Value of the minimum adjusting T2A3-0 set to 0001
capacitance step
1.57
pF
AGC_MIXSP AGC2 Starting Point on Mixer 2 f_IN = 10.7MHz; Value of
48
dBµV
V_MIX2AMIN for which V_MIX2OUT is
1dB compressed;
IF2A1-0 set to 10
AGC_MIXIS AGC2 intervention slope on
Mixer 2
f_IN = 10.7MHz:∆V_MIX2OUT for
∆V_MIX2AMIN = 1dB;
IF2A1-0 set to 10
0.1
dB/dB
AGC_MIXR AGC2 Range on Mixer 2
f_IN = 10.7MHz; Range of
50
dB
V_MIX2AMIN above AGC_MIXSP for
which V_MIX2OUT is not
increasing linearly with a
1dB/dB slope; IF2A1-0 set to 10
AM IF2 Amplifier
Ref: AM Test Circuit; f_IN = 450KHz, measure input at V_IF2AMPIN, output at V_IF2AMPOUT (switches must be in position 1).
R_IN,IF2AMP Input Resistance
2
KΩ
G_IF2AMPMIN Minimum Gain
V_IF2AMPIN = 10dBµV;
IF2A1-0 set to 00
50
dB
G_IF2AMPMAX Maximum Gain
V_IF2AMPIN = 10dBµV;
IF2A1-0 set to 11
59
dB
AGC_AMPSP AGC2 Starting Point on IF2 Amp Value of V_IF2AMPIN for which
60
dBµV
V_IF2AMPOUT is 1dB compressed,
IF2A1-0 set to 01
AGC_AMPR AGC2 Range on IF2 Amp
f_IN = 10.7MHzRange of
33
dB
V_IF2AMPIN above AGC_AMPSP for
which V_IF2AMPOUT is not
increasing linearly with a
1dB/dB slope; IF2A1-0 set to 01
AGC_AMPIS AGC2 intervention slope on IF2 f_IN = 10.7MHz; ∆V_IF2AMPOUT for
0.1
dB/dB
Amp
∆V_IF2AMPIN = 1dB;
IF2A1-0 set to 1
AGC_TCR AGC2 Time Constant Ratio
Ratio of AGC2 "reception" Time
150/5
s/s
Constant and "seek" Time
Constant
13/38