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VHF/ UHF-Tuner-IC
U2305B
Description
This tuner IC requires a power supply of 5 V and performs
the function of three separate oscillators an mixers,
SAWF-driver, L.O.-output and tri-state band switch.
This tuner IC is decigned for high performance tuners for
TV, VCR and PCs.
Features
D 5 V supply voltage
D Frequency range from 48 to 860 MHz
D Band A: balanced high impedance mixer input and
amplitude controlled oscillator
D Band B + C: balanced low impedance mixer input and
symmetrical oscillator
D Balanced L. O.-outputs for prescalers or PLL
D SAW filter driver with low impedance output
D Voltage regulator for stable operating characteristics
D ESD protection on all pins except oscillator pins and
RF-inputs
www.DataSheet4U.com
Benefits
D The integration of 3 bands and the small SSO28
package allows to design very small and economical
3-band tuners with high performance.
Block Diagram
13
4 657
8 10 9 11
Osc. A
Osc. B
Osc. C
19 2
Voltage-
Stabilizer
Band-Switch
12
L.O. 27
28
Mixer-Output
SAW-Driver
17
18
14
Band A
25 24
RF
Band B
Band C
23 22 26 21 20
Figure 1. Block diagram
16 15
13
12504
TELEFUNKEN Semiconductors
Rev. A1, 10-Sep-96
Preliminary Information
1 (8)

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U2305B
Pin Description
Osc A, base 1
GND (common) 2
Osc A, coll. 3
Osc B, base 4
Osc B, coll. 5
Osc B, coll. 6
Osc B, base 7
Osc C, base 8
Osc C, coll. 9
Osc C, coll. 10
Osc C, base 11
Band sw. 12
SAWF, out 13
SAWF, out 14
28 L.O. out
27 L.O. out
26 GND (RF)
25 RF in, A
24 RF in, A
23 RF in, B
22 RF in, B
21 RF in, C
20 RF in, C
19 VS
18 Mix out
17 Mix out
16 SAWF, inp.
15 SAWF, inp.
95 10886
Pin
1
2
3
4, 7
5, 6
8, 11
9, 10
12
13, 14
15, 16
17, 18
19
20, 21
22, 23
24, 25
26
27, 28
Symbol
Function
Osc A, base Oscillator band A, base
GND Ground, common
(common)
Osc A, coll. Oscillator band A, collector
Osc B, base Oscillator band B, bases
Osc B, coll. Oscillator band B, collectors
Osc C, base Oscillator band C, bases
Osc C, coll. Oscillator band C, collectors
Band sw. Tri-state band switch
SAWF, out SAW filter driver outputs
SAWF, inp. SAW filter driver inputs
Mix out Mixer outputs, open collec-
tor
VS Supply voltage Vs
RF in, C RF inputs, band C
RF in, B RF inputs, band B
RF in, A RF inputs, band A
GND (RF) Ground, RF part
L.O. out L.O.-outputs
Ordering Information
Extended Type Number
U2305B-AFSG3
Package
SSO28
Remarks
Taped and reeled
2 (8) TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 10-Sep-96

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Absolute Maximum Ratings
All voltages are referred to GND, Pin 2
Parameters
Supply voltage
Pin 19
RF inputs
Pin (20-25)
IF outputs
Pin 17-18
Tri-state switch voltage
Pin 12
Junction temperature
Storage temperature
U2305B
Symbol Min. Typ. Max. Unit
VS 5.25 V
VS V
5.5 V
ViTRI
Tj
Tstg
–40
VS V
125 °C
125 °C
Operating Range
All voltages are referred to GND, Pin 2
Parameters
Supply voltage
Ambient temperature
Test Conditions / Pins Symbol Min Typ Max Unit
Pin 17-19
VS
4.5
5.0 5.25 V
Tamb
–25
75 °C
Thermal Resistance
Parameters
Junction ambient
Package SSO28 soldered to PCB (see layout page 5)
Symbol
RthJA
Typ
128
Unit
K/W
Electrical Characteristics
Test conditions (unless otherwise specified): Vs = 5 V. Tamb = 25 °C. Reference point Pin 2.
Referred to test circuit page 5.
Parameters
Test Conditions / Pins
Supply voltage
Pin 17-19
Supply current
Pin 17-19
Band switch
Voltage band A
Pin 12
Voltage band B
Pin 12
Voltage band C
Pin 12
Switching current
VSW = 5 V
Pin 12
LO output
LO level each output
RL = 50 W Pin 27, 28
SAW filter driver fi = 36 MHz
Input impedance
Pin 15, 16
Output impedance
Pin 13, 14
Voltage gain
Pin 15, 16 13, 14
Symbol
VS
IS
VSWA
VSWB
VSWC
ISW
PLO
ZiSAW
ZoSAW
GvSAW
Min.
4.5
0
25%
55%
–25
Typ.
5.0
42
450
70
17
Max.
5.25
20%
50%
100%
100
–17
Unit
V
mA
VS
VS
VS
mA
dBm
Ohm
Ohm
dB
TELEFUNKEN Semiconductors
Rev. A1, 10-Sep-96
Preliminary Information
3 (8)

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U2305B
Electrical Characteristics (continued)
Parameters
Band A
Input frequency range
Input impedance
Gain (note 4)
Noise figure DSB (note 2)
Input level for (note 3):
IM3 (interm. of 3rd order
IM2 (interm. of 2nd order)
Band B (note 1)
Input frequency range
Input impedance
Gain (note 4)
Noise figure DSB (note 2)
Input level for (note 3):
IM3 (interm. of 3rd order)
Band C (note 1)
Input frequency range
Input impedance
Gain
Noise figure DSB (note 2)
Input level for IM3
(interm. of 3rd order, note 3)
Test Conditions / Pins
Pin 24
Figure 3
Pin 24
Pin I/P to O/P
Pin I/P to O/P
fiA = 50 MHz
fiA = 150 MHz
Each carrier
fiA = 71 MHz Pin I/P
fiA = 71 MHz Pin I/P
Pin 22, 23
Pin 22, 23
Pin I/P to O/P
Pin I/P to O/P
fiB = 200 MHz
fiB = 450 MHz
Each carrier
fiB = 300 MHz Pin I/P
Pin 20, 21
Figure 3
Pin 20, 21
Pin I/P to O/P
Pin I/P to O/P
fiC = 500 MHZ
fiC = 800 MHz
Each carrier
fiC = 600 MHz Pin I/P
Symbol
fiA
S11A
GA
NF
NF
ViA
ViA
fiA
S11B
GB
NF
NF
ViB
fiC
S11C
GC
NF
NF
ViC
Min Typ Max
48 170
28
11.5
12
–23
–22
170
see Fig. 3
32
9.5
10
470
–28
470 860
32
10.5
11.5
–28
Unit
MHz
dB
dB
dB
dBm
dBm
MHz
dB
dB
dB
dBm
MHz
dB
dB
dB
dBm
Notes
1) The RF inputs B and C are symmetrical driven by means of a hybrid for 180° phase shifting, consequently the
source impedance is 100 W. All other impedance for RF tests is 50 W.
2) The noise figure (NF) is the value for double-side-band measurement.
3) The intermodulation test (2-carrier-method) which is made on IF-centre is in reference to a signal-to-IM ratio
of 60 dB.
4) Gain is the ratio of the voltage at the primary coil of L5 to the available voltage at the input.
4 (8) TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 10-Sep-96

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Test and Principle Application Circuit
U2305B
Band C
UHF
Band B
VHFH
Band A
VHFL
I/P
I/P
I/P
180D
180D
Hybrids 0 / 180 degree
with 50 ohms Z(in)
and 100 ohms (2x50) Z(out)
V(b)
10n
L.O.
100p
100p
1n 1n 1n 1n 1n 1n
IF : PC 38.9 MHz
SC 33.4 MHz
L.O.
25 21 17
The output–voltage of the
IF is calculated back to the
U2305B
primary circuit of L5
15
9 13
Air Coils 0.6 mm
enamelled copper wire
L1 8 Wdg. 3.0 mm 0
L2 3 2.5
L3 3 2.5
L4 3 2.5
1p
2p7 2p2 1p0 1p0
18 2p2
2p7
L2
1p0 1p0
L3
L6
L6
1n
15p
1n
L5
IF–Out
O/P
2p
TOKO–Coils
L5 t.b.d.
L6 t.b.d.
L1
BB620
68p
BB619
2k2 L4
V(Band)
82p 1k
100p
18k 1n
8p2 BB515
18k 18k
18k
10n V(Diode)
Figure 2. Test and principle application circuit
PCB for the RthJA-Measurement
Material: 35 m m one-sided Cu-coated epoxy PCB,
40 mm 40 mm 1.5 mm
95 10719
Figure 3. PCB for the RthJA-measurement
TELEFUNKEN Semiconductors
Rev. A1, 10-Sep-96
Preliminary Information
5 (8)