VHF I / VHF II / UHF-Tuner IC
Preliminary Data
Features
q
Few external components
q
Frequency and amplitude-stable unbalanced
oscillator for the VHF I-frequency range
q
Frequency and amplitude-stable balanced oscillators
for the VHF II- and UHF-frequency range
q
Optimum decoupling of input frequency from oscillator
q
Double balanced mixer with wide dynamic range and
high-impedance inputs for the VHF I-frequency range
P-DSO-24-1
q
Double balanced mixer with wide dynamic range and
low-impedance inputs for the VHF II- and
UHF-frequency range
q
Low-impedance SAW-filter driver output
q
SAW-filter driver with high signal-handling capability
q
Internal band switch
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Low-noise, internal reference voltage
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Integrated 1st IF-bandpass filter
Type
TUA 2019-5X
TUA 2019-5X
Ordering Code
Q67000-A5150
Q67006-A5150
Package
TUA 2019-5X
Bipolar IC
P-DSO-24-1 (SMD)
P-DSO-24-1 Tape & Reel
Circuit Description
This integrated circuit permits the design of TV-tuners covering the entire frequency
range from 48 … 900 MHz split into 3 frequency bands. The application is suitable for all
tuners in TV- and VCR-sets.
The integrated circuit includes 3 balanced mixers (double balanced mixer/ring mixer),
one unbalanced oscillator for VHF I and two balanced oscillators for VHF II and UHF, a
SAW-filter driver amplifier as well as a reference voltage source and a band switch.
Filters between tuner input and IC separate the TV-frequency signal into three bands.
The band switch ensures that only one band at a time is activated. In the activated band
the signal passes a frontend stage with MOSFET-amplifier, a double-tuned bandpass
filter and is then fed to the balanced mixer input of the IC which is a high-impedance
stage for the VHF I-range and a low-impedance stage for the VHF II- and UHF-range,
respectively. The input signal is mixed there with the oscillator signal from the activated
oscillator section and fed into common IF-stage for all bands. The IF-signal is further
amplified in a SAW-filter driver section in order to drive the SAW-filter with a low
impedance.
Semiconductor Group
1
02.95
TUA 2019-5X
Pin Configuration
(top view)
P-DSO-24-1
Semiconductor Group
2
TUA 2019-5X
Pin Definitions and Functions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Symbol
Osc. output 1
Osc. output 2
GND
VHF I-input 1
VHF I-input 2
VHF II-input 1
VHF II-input 2
UHF-input 1
UHF-input 2
+
V
S
SAW-filter driv.
out 1
SAW-filter driv.
out 2
Band switch
UHF-osc.
input B1
UHF-osc.
output C2
UHF-osc.
output C1
UHF-osc.
input B2
VHF II-osc.
input B1
Function
VHF I/ VHF II/ UHF-osc. signal output to PLL,
symmetrical to pin 2
VHF I/ VHF II/ UHF-osc. signal output to PLL,
symmetrical to pin 1
Ground
VHF I-mixer input high-impedance, symmetrical to pin 5
VHF I-mixer input high-impedance, symmetrical to pin 4
VHF II-mixer input low-impedance, symmetrical to pin 7
VHF II-mixer input low-impedance, symmetrical to pin 6
UHF-mixer input low-impedance, symmetrical to pin 9
UHF-mixer input low-impedance, symmetrical to pin 8
Supply voltage
SAW-filter driver output, low impedance,
symmetrical to pin 12
SAW-filter driver output, low impedance,
symmetrical to pin 11
VHF I/ VHF II/ UHF-band switch
UHF-osc. amplifier, high-impedance base input,
symmetrical to pin 17
UHF-osc. amplifier, high-impedance coll. output,
symmetrical to pin 16
UHF-osc. amplifier, high-impedance coll. output,
symmetrical to pin 15
UHF-osc. amplifier, high-impedance base input,
symmetrical to pin 14
VHF II-osc. amplifier, high-impedance base input,
symmetrical to pin 21
3
Semiconductor Group
TUA 2019-5X
Pin Definitions and Functions
(cont’d)
Pin No.
19
20
21
22
23
24
Symbol
VHF II-osc.
output C2
VHF II-osc.
output C1
VHF II-osc.
input B2
VHF I-osc.
coupling 1
GND
VHF I-osc.
coupling 2
Function
VHF II-osc. amplifier, high-impedance collector output,
symmetrical to pin 20
VHF II-osc. amplifier, high-impedance collector output,
symmetrical to pin 19
VHF II-osc. amplifier, high-impedance base input,
symmetrical to pin 18
VHF I-osc. coupling, collector output
Ground
VHF I-osc. coupling, base input
Semiconductor Group
4
TUA 2019-5X
Block Diagram
Semiconductor Group
5
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