Datasheet

UNISONIC TECHNOLOGIES CO., LTD
ULA1145
Preliminary
CMOS IC
FM TUNER IF SYSTEM

DESCRIPTION
The UTC ULA1145 is a high integrated IC for FM tuner IF
stage, special in car radio.

FEATURES
* Built-in IF count buffer circuit and microprocessor-controlled
switch circuit for ETR
* High S/N
* Wide range output
* More simplifies design:
- Built-in SD circuit—regulable sensitivity
independently of soft mute characteristics
- Variable S-meter gradient—output with three pins

ORDERING INFORMATION
Ordering Number
ULA1145G-N20-R

Package
HTSSOP-20
Packing
Tape Reel
MARKING
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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
Preliminary
PIN CONFIGURATION
NC 1

CMOS IC
20 NC
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
PIN DESCRIPTION
PIN NO.
1, 20
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
PIN NAME
NC
IFIN
IFBIAS
IFGND
Msc
MGC
MAC
AFOUT
AFCOUT
IFOUT
QIN
VREG
VCC
IFCT
GND
MDRI
SOUT
SDCT
SDOUT
DESCRIPTION
IF input
IF amp bias
IF amp GND
Mute start control
Mute gradient control
Mute attenuation control
AF output
AFC output
IF output
Quadrature detection input
Voltage regulator output
VCC
IF count output, control
GND for detection circuit
Mute driver
S-meter output
SD sensitivity control
SD output
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Preliminary
CMOS IC
PIN FUNCTIONS
PIN NO.
Function
2
IF input
3
Bias pin
4
GND
5
Soft mute start point
control
Internal Equivalent Circuit
Notes
2
IF limiting amp GND
For setting the soft mute starting
point.
5
6
Can be used for S-meter output.
For setting the mute gradient from
the soft mute starting point to the
noise finishing point.
Soft muting gradient
control pin
6
7
For setting amount of mute
attenuation. The demodulation
level changes when the external
resistance value is varied.
Mute Att
7
8
FM-AF output
9
AFC input
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Preliminary
CMOS IC
PIN FUNCTIONS(Cont.)
PIN NO.
Function
10
IF output
Internal Equivalent Circuit
Notes
Output to the phase circuit
IF input via the phase shift
circuit. The mute circuit
malfunctions and demodulation
output decreases if the voltage
level at this pin drops below
180mV.
11
IF input
12
Vref
4.8V
13
VCC
Supply voltage 7.5~14V
14
IF buffer output
15
GND
16
Mute driver
17
S-meter output
18
SD sensitivity
setting
19
SD output
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Amount of mute attenuation
depends on and is controlled by
the voltage at this pin.
PNP open collector output
Can be used for S-meter output
High active
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Preliminary
CMOS IC
BLOCK DIAGRAM
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Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING (TA=25°C)
PARAMETER
SYMBOL
RATINGS
Maximum Supply Voltage Pin 13
VCC
14
Maximum Supply Current Pin 13
ICC
45
TA=70°C, Mounted On PC Board
630
Allowable Power
TA=25°C, Mounted On PC Board,
PD
630
Dissipation
Independent IC
TA=70°C, Independent IC
360
Operating Temperature
TOPR
-20~+70
Storage Temperature
TSTG
-40~+125
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

mW
mW
°C
°C
OPERATING CONDITIONS (TA=25°C)
PARAMETER
Recommended Supply Voltage
Operating Voltage Range

UNIT
V
mA
mW
SYMBOL
VCC
VCC op
RATINGS
8
7.5~14
UNIT
V
V
ELECTRICAL CHARACTERISTICS (TA=25°C, VCC=8V, fin=10.7MHz)
PARAMETER
Quiescent Current
Current Drain
Demodulation Output
Total Harmonic Distortion
Signal-to-Noise Ratio
Input Limiting Voltage
Muting Sensitivity
Muting Bandwidth
Muting Attenuation
Signal Strength
Indication Output
Muting Drive Output
AM Rejection Ratio
Offset Voltage
SD Sensitivity
IF Count Output Level
SYMBOL
TEST CONDITIONS
ICCO
VIN=0dBμ
ICC
VIN=100dBμ
VO
VIN=100dBμ, 400Hz Tone, 100%
VIN=100dBμ, 400Hz Tone, 100%, Single
THD
Tuning Coil
S/N
VIN=100dBμ, 400Hz Tone, 100%
VIN (lim)
400Hz Tone, 100%, Soft Mute ON
VIN (mute) V16=2V
BW(mute) VIN=100dBμ, V19≤0.3V
VIN=100dBμ, V16=2V, 400Hz Tone,
mute(1)
100%
VIN=100dBμ, V16=4V, 400Hz Tone,
mute(2)
100%
V17-0
VIN=0dBμ, R16=10kΩ, Pin 17
V17-50
VIN=50dBμ, R16=10kΩ, Pin 17
V17-70
VIN=70dBμ, R16=10kΩ, Pin 17
V17-100
VIN=100dBμ, R16=10kΩ, Pin 17
V16-0
VIN=0dBμ, Pin 16
V16-100
VIN=100dBμ, Pin 16
AMR
VIN=100dBμ, 1kHz Tone, 30% AM
V8-12
VIN=0dBμ, Pins 8 to 12
VIN=0dBμ, Pins 9 to 12
V9-12
VSD
Pin 19
VIF-ON
VIN=100dBμ, Pin 14, CL=10pF
VIF-OFF
VIN=100dBμ, Pin 14, CL=10pF
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MIN
18
20
300
TYP
26
29
400
MAX UNIT
36
mA
40
mA
520 mVrms
0.3
0.8
%
75
34
30
140
85
40
36
190
46
42
280
dB
dBμ
dBμ
kHz
10
15
20
dB
25
29
33
dB
0
1.4
2.5
5.0
4.0
0
57
-0.25
-0.5
50
110
0.1
2.3
4.5
5.5
4.8
0
70
0
0
58
180
1
0.6
3.2
5.5
6.0
5.5
0.3
V
V
V
V
V
dB
dB
+0.25
V
+0.5
V
66
dBμ
280 mVrms
3
mVrms
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Preliminary
CMOS IC
SD OUTPUT CIRCUIT
1.
Hole detector
Mute driver
16
Signal meter
Bandmute
19 SD output
Comparator
Exhibit hysteresis
18
As shown, the SD output is the logical AND of the band mute and S-meter comparator outputs.
2. Signal search using the SD output circuit
2-1 The transition response characteristics of the SD output circuit depends on the time constants of pins 16, 17, 18
and 9.
As the SD output transition response characteristics are determined by the pin with the largest time constant,
erroneous stopping will result when a search time is less than the largest one.
2-2 Band mute range circuit time constant (pin 9)
An equivalent circuit to the band circuit is shown below.
VREF 12
RAFC
9
C
Mute switch circuit
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Preliminary
CMOS IC
SD OUTPUT CIRCUIT(Cont.)
(1) Current path during detuning
12
RAFC
12
9
RAFC
9
C
C
(2) Current return path from detuning
12
9
RAFC
C
I=0
As can be seen from the above circuit diagrams, the time constant during detuning is determined by the internal
PNP resistance, the NPN collector resistance and the capacitance of the externally-mounted capacitor. This time
constant is determined by the external resistance RAFC and capacitor
C. This time constant, τ = RAFC×C, must be set depending on the required search time.
3. Narrow-band SD output circuit
An IF count circuit is provided for equipment compatibility for the European marketplace. However, if the band is
made narrow using only the SD circuit, there is a tendency for the number of erroneous stops caused by an
undesired signal to increase. To prevent this, two threshold voltages should be used to control the SD circuit.
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Preliminary
CMOS IC
SOFT MUTE CHARACTERISTICS
1. Control
The S/N setting (C/N) for weak inputs and the -3dB limiting sensitivity can be controlled by obtaining the proper
value for the un-soft muted input/output signal characteristic. However, usable sensitivity cannot be controlled as this
is determined by the front end and IF design which are unrelated to soft muting.
2. Soft mute setting
Soft mute operation depends on the S-meter circuit voltage and the hole detection circuit voltage. As shown in the
graph on the right, the degree of soft muting correlates with the mute drive voltage, V15. The control signal line of
the mute drive voltage switches before and after the 10dBμ ANT divergence point.
When adjusting the soft mute with a weak signal which does not affect the S-meter, first adjust it using the hole
detection input signal. However, as the S-meter output will readjust the soft mute level, also adjust the soft mute
using the S-meter output. At this point, the hole detection output adjusts the gain up to the IF input, causing a
variance. Also, the S-meter output is varied by the value of R16.
(Mute attenuation)
Mute drive voltage V15
Hole detector
S-meter
(Adjust R4, R5)
ANT input level (dBµ)
3. Soft mute transition response characteristic
The degree of soft muting automatically varies according to the change in input field strength. Omitting the
influence of the front end wideband AGC circuit, the UTC ULA1145’s response speed is dependent on the time
constant at pins 16 and 17.
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Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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