TDA6508TT NXP Semiconductors, TDA6508TT Datasheet - Page 29

• Manufacturer Part Number: TDA6508TT
• Manufacturer: NXP Semiconductors

Specifications of TDA6508TT

• Pin Count: 32
• Screening Level: Commercial
• Package Type: TSSOP
• 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
Hybrid loss = 1 dB.
NF = NF
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
= 478.15 MHz (min.); 902.15 MHz (max.).
e u
e w
= 444.75 MHz (min.); 868.75 MHz (max.).
50
50
= 439.25 MHz (min.); 863.25 MHz (max.).
o(meas)
meas
AM = 30%
unwanted
wanted
source
source
signal
signal
+ 15 dB (transformer ratio N1/N2 and transformer loss).
hybrid loss.
Fig.25 Cross-modulation measurement in the HIGH-band of the TDA6508; TDA6509.
Fig.24 Noise figure measurement in the HIGH-band of the TDA6508A; 6509A.
A
B
HYBRID
C
D
SOURCE
NOISE
50
V i
50
50
A
B
HYBRID
RF(w)
B
; V
A
HYBRID
C
D
RF(u)
o(w)
; AM = 30%; AF = 2 kHz.
= 110 dB V.
C
D
HIGH_RFIN1
HIGH_RFIN2
IFAMP_OUT1
IFAMP_OUT2
D.U.T.
HIGH_RFIN1
HIGH_RFIN2
29
IFAMP_OUT1
D.U.T.
V
o
turns
2 x 5
N1/N2 = 5
27
2
turns
TDA6508; TDA6508A;
TDA6509; TDA6509A
voltmeter
RMS
V
attenuator
FIGURE
METER
NOISE
18 dB
MDB256
V o(meas)
38.9 MHz
FILTER
Product specification
modulation
analyzer
50
MDB251