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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)