TEMIC U4476B

U4476B
IF Amplifier / Converter for DVB (Cable)
Description
The U4476B is a bipolar circuit for the processing of
DVB-Cable IF signals (Digital Video Broadcasting). The
amplifier/ converter is suitable for QAM modulated IF
signals (1st IF) and provides the gain controlled 2nd IF.
With 5 V supply voltage the IC allows application in
RF/IF front ends for DVB-Cable receivers (set top boxes).
Features
D Internal AGC with average detection for the QAM
D Gain controlled amplifier for the 1st IF (36 MHz)
modulated DVB signal, reference level is adjustable
D IF converter for the 2nd IF (7 MHz);
D 5 V supply voltage; low-power consumption
VCO circuit is controlled by external PLL
D Bandwidth of the output signal: 10 MHz (–1 dB)
Package: 28-pin small outline plastic package (SO28)
Block Diagram
I2C
23
22
5
IF 1
20
VCO
PLL
6
18
13
2nd IF
9
IF 2
10
28
Ref
(DVB)
AGC:
QAM
7
12
Tuner
Tuner
AGC
11
VS
24
Control
15
Input
select
Band
Gap
3
8
21
12703
Figure 1. Block diagram
TELEFUNKEN Semiconductors
Rev. A2, 15-Jan-98
1 (7)
Preliminary Information
U4476B
Ordering Information
Extended Type Number
U4476B-MFLG3
Package
SO28
Pin Description
NC
1
28 AGCRef
NC
2
27 NC
CRef
3
26 NC
NC
4
25 NC
Vin1 5
24 VS
6
23 Vvco
CAGC 7
22 Vvco
GND
8
21 GND
Vin2
9
20 LOout
Vin2
10
19 NC
Rtop
11
18 Vtun
Vin1
Itun 12
17 NC
Vout 13
16 NC
NC
15 Vsw
14
14529
Figure 2. Pinning
Absolute Maximum Ratings
Remarks
Taped and reeled, 2000 pcs
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Pin
1, 2
3
Symbol
NC
CRef
4
5, 6
7
8
9, 10
11
12
13
14
15
16
17
18
NC
Vin1
CAGC
GND
Vin2
Rtop
Itun
Vout
NC
Vsw
NC
NC
Vtun
19
20
NC
LOout
21
22, 23
24
25
26
27
28
GND
Vvco
VS
NC
NC
NC
AGCRef
Function
Not connected
Capacitor for internal band gap
reference voltage
Not connected
IF input 1 (symmetrical)
DVB AGC (time constant)
Ground
IF input 2 (symmetrical)
Take-over point, tuner AGC
Tuner AGC output current
Output signal (2nd IF)
Not connected
IF input selector switch
Not connected
Not connected
Input for the external
VCO tuning voltage
Not connected
Local oscillator output
(reference signal)
Ground
VCO circuit (symmetrical)
Supply voltage
Not connected
Not connected
Not connected
External reference voltage
(comparator DVB AGC)
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Parameters
Symbol
VS
IS
Ptot
Iout
Tj
Tstg
VESD
Supply voltage
Supply current
Power dissipation, VS = + 5.5 V
Output currents
Junction temperature
Storage temperature
Electrostatic handling *)
*) Equivalent to discharging a 200-pF capacitor through a 0-
Value
5.5
100
550
5
125
–25 to +125
tbd
Unit
V
mA
mW
mA
°C
°C
V
resistor
2 (7)
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A2, 15-Jan-98
U4476B
Operating Range
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Thermal Resistance
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Parameters
Supply voltage range
Ambient temperature
Parameters
Junction ambient when soldered to PCB
Symbol
Value
Unit
VS
Tamb
4.5 to 5.5
0 to +85
V
°C
Symbol
RthJA
Value
75
Unit
K/W
Electrical Characteristics
VS = 5 V, Tamb = 25°C
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Parameters
Test Conditions / Pins
DC supply
Supply voltage
Supply current
IF inputs
Input sensitivity, rms value
Input impedance
See note 1
Input capacitance
See note 1
DVB AGC (QAM modulation)
IF gain control range
IF2 output voltage
Pin 13 = 1.8 Vpp
VCO
Oscillator frequency
Tuning range
fvco = 43 MHz
Cvco = 8.2 pF
Local oscillator output signal fvco = 43 MHz
Cvco = 8.2 pF
Local oscillator control
fvco = 43 MHz
signal
Cvco = 8.2 pF
2nd IF output
Output current source
Output current sink
Output resistance
See note 1
Output amplitude
Peak-to-peak value
DC output voltage
Bandwidth of 2nd IF (–1 dB) RL ≥ 1 k , CL ≤ 50 pF
Frequency response over
AGC range
IF input switch
Control voltage
See also note 2,
Input 1 is active
‘high’ (IF1 active, Pin 5–6)
Input 2 is active
‘low’ (IF2 active, Pin 9–10)
Switching current
(Pin 15 to ground)
TELEFUNKEN Semiconductors
Rev. A2, 15-Jan-98
Symbol
Min.
Typ.
Max.
Unit
VS
IS
4.5
5.0
80
5.5
100
V
mA
80
1.2
2
120
µVrms
k
pF
vin
Rin
Cin
Gv
60
fvco
65
ftun
±1.5
MHz
MHz
LOout
100
mV
vtun
43
dB
0.5
2.7
±Iout
2
Rout
vo,vid
1.6
B
10
1.8
2.2
4.5
V
5
4
100
2.0
mA
2.0
B
VSW
VSW
ISW
60
2.5
3.5
1.5
30
V
V
MHz
dB
V
V
A
3 (7)
Preliminary Information
U4476B
Electrical Characteristics
Vs = 5 V, Tamb = +25°C
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Parameters
Tuner AGC
Available tuner AGC current
Allowable output voltage
IF slip tuner AGC
IF input signal for minimum
take over point
IF input signal for maximum
take over point
Variation of the take over
point by temperature
(Pin 28 open)
Test Conditions / Pins
Symbol
Min.
Typ.
Max.
Unit
Itun
Vout
1
0.3
2
4
13.5
10
4
mA
V
dB
mV
Current Itun: 10% to 90%
8
GIF
vin
vin
Tamb = 55°C
IF AGC: Gv = 46 dB
40
mV
2
vin
3
dB
Notes:
1.
This parameter is given as an application information and not tested during production.
2.
Without external control voltage (pin not connected) the input 1 is automatically selected.
Basic Application Circuit
DVB
Ref
VCO
Frequency
VS
VCO
Tuning
Input
Switch
22 mF
10 nF
50 kW
+12 V
8.2 pF
28
27
26
25
24
23
10 nF
22
21
20
19
18
17
16
15
9
10
11
12
13
14
U4476B
2.2 mF
1
2
3
4
5
6
8
7
10 nF
50 W
1
2.2 mF
8
IF 1
2.2 mF
IF 2
10 k W
AGC
IF
2
7
U4744B
10 nF
SAW 1
Tuner AGC
take over
point
*)
3
6
4
5
SAW 2
10 nF
*)
U4744B:
Tuner 2 nd IF
AGC
current
13900
SAW driver, device phased out, not for new development
Figure 3.
4 (7)
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A2, 15-Jan-98
U4476B
IM3 Measurements and Application Recommendations
IM3 Measurement
+5 V
For correct measurement of IM3 with the 2-carrier
method, it is necessary to control the internal IF amplifier
via an external voltage at Pin 7. The criteria for a correct
value of the external control voltage is the output
amplitude of 1.8 Vpp (or lower). Please note that
each
change of the input level requests a correction of the
external gain control voltage at Pin 7 in order to achieve
the 1.8-Vpp output level again. In this case, IM3 is nearly
43 dB, independent from the input level. With an output
voltage of 1.5 Vpp only, the IM3 is about –50 dB.
Anyway, if the output amplitude is more than 1.8 Vpp
(specified), the IM3 will decrease rapidly. In the graphic
below, IM3 is shown for two different conditions:
from DSP
S852T
*
50
48
Vout = 1.5 Vpp
46
IM3 ( dB )
44
42
Vout = 1.8 Vpp
40
38
to Pin 7
10 kΩ
100 nF
14581
Figure 5.
External LO Application
If the internal VCO is not used, the LO can be fed
unbalanced or balanced to the VCO Pins 22 and 23. The
application shown below is generating an unbalanced LO
signal by using a 36-MHz third-overtone quartz
reference. The application circuit is taken from IQD
Limited Crystal Product Data Book. The LO signal is fed
unbalanced with 1 nF coupling capacity to Pin 22. Pin 23
has to be blocked to ground with an 1-nF capacitor. The
typical LO amplitude is 100 dBµV. The variation of the
LO input amplitude should not exceed ± 5 dB (better:
±3 dB).
36
+5 V
34
10 kΩ
32
100 pF
30
40
14778
50
60
70
80
90
Input voltage (each carrier) ( dBmV )
Figure 4. IM3 vs. IF input voltage and IF2out voltage
Test conditions: input: f1 = 38 MHz,
f2 = 39 MHz, LO = 43 MHz
490 nH
68 pF
If the gain control of the IC is carried out by an external
DSP, the internal charge pumps of the AGC (Pin 7) have
to be overlapped by an external voltage source. The
internal AGC currents are ± 20 µA. Therefore, the
minimum current capacity of the external voltage source
should be ± 30 µA or more.
The circuitry shown in figure 5 takes some more current.
1 nF
4.7 kΩ
560 Ω
Circuitry for External Gain Control
TELEFUNKEN Semiconductors
Rev. A2, 15-Jan-98
S852T
100
to Pin 22
47 pF
560 Ω
14582
Figure 6.
Note:
With external LO operation, Pin 18 (VCO tuning voltage)
should be connected to the supply voltage, and Pin 20
(LO output) should not be connected to the PCB.
5 (7)
Preliminary Information
U4476B
Package Information
Package SO28
Dimensions in mm
9.15
8.65
18.05
17.80
7.5
7.3
2.35
28
0.25
0.25
0.10
0.4
1.27
10.50
10.20
16.51
15
technical drawings
according to DIN
specifications
13033
1
14
6 (7)
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A2, 15-Jan-98
U4476B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances ( ODSs).
The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and
forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban
on these substances.
TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of
continuous improvements to eliminate the use of ODSs listed in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency ( EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively.
TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain
such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized
application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of,
directly or indirectly, any claim of personal damage, injury or death associated with such unintended or
unauthorized use.
TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
TELEFUNKEN Semiconductors
Rev. A2, 15-Jan-98
7 (7)
Preliminary Information