TDA6508ATT/C3,118 NXP Semiconductors, TDA6508ATT/C3,118 Datasheet - Page 24

• Manufacturer Part Number: TDA6508ATT/C3,118
• Manufacturer: NXP Semiconductors

Specifications of TDA6508ATT/C3,118

• Lead Free Status / Rohs Status: Compliant

Philips Semiconductors
2005 Mar 25
handbook, full pagewidth
handbook, full pagewidth
3-band mixer/oscillator and PLL for
terrestrial tuners
NF = f
V
Wanted output signal at picture carrier frequency f
Unwanted output signal at sound sub-carrier frequency f
Measuring the level of unwanted signal causing 0.3% AM in the wanted signal.
f
f
f
RF(w)
RF(u)
osc
o
= V
= 82.15 MHz (min); 200.15 MHz (max.).
= 48.75 MHz (min); 166.75 MHz (max).
= 43.25 MHz (min); 161.25 MHz (max).
meas
e w
e u
o(meas)
Fig.14 Noise figure measurement in the LOW and MID-bands of the TDA6508A; TDA6509A.
input circuit loss (dB).
+ 15 dB (transformer ratio N1/N2 and transformer loss).
50
50
Fig.15 Cross-modulation measurement in the LOW-band of the TDA6508; TDA6509.
AM = 30%
unwanted
source
wanted
source
signal
signal
SOURCE
NOISE
A
B
HYBRID
C
D
50
RF(w)
V i
BNC
CIRCUIT
; V
INPUT
RF(u)
o(w)
LOW_RFIN
; AM = 30%; AF = 2 kHz.
IFAMP_OUT1
IFAMP_OUT2
= 110 dB V.
D.U.T.
RIM
24
LOW_RFIN or
MID_RFIN
IFAMP_OUT1
D.U.T.
V
o
turns
2 x 5
N1/N2 = 5
2
turns
voltmeter
27
RMS
V
attenuator
TDA6508; TDA6508A;
TDA6509; TDA6509A
18 dB
V o(meas)
FIGURE
METER
NOISE
MDB264
38.9 MHz
FILTER
MDB261
Product specification
modulation
analyzer
50