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U6101B
IF System and I/Q Demodulator for Digital Satellite TV Transmissions
Description
The U6101B is a monolithic integrated circuit in TEMIC's UHF 5 technology for Satellite Digital Video Broadcasting (DVBS) and other digital direct satellite service applications. The circuit operates in a wide frequency range and in a large input level range. Implemented are two orthogonal mixer stages (precise phase-matched by a control loop), a gain-controlled IF amplifier of high input sensitivity with two switchable isolated inputs, and an AGC-system for tuner and IF level control. Alternatively the output level may be controlled automatically, e.g., via the channel decoder AGC signal output. The local oscillator operates at IF input frequency. The oscillator signal is internally doubled and divided again to generate the orthogonal mixer driving signals.
Features
D Frequency range from 390 to 520 MHz D Two unbalanced switchable inputs D High I/Q phase accuracy, based on TEMIC's patented
0/90 control loop circuit
Benefits
D Two switchable IF-inputs to connect a combined
SAW filter
D Oscillator for SAW or LC tank circuit D Adjustable tuner AGC control D Low impedance output driver D Balanced prescaler output D Output signal level adjustable or fixed at typical or
minimum data sheet value by pin programming
D D D D D
Input impedance 50 , gain independent High input sensitivity AGC control range -35 dB Internal AGC detector Additionally external gain control and output level setting possible
D Low power consumption, 5-V supply voltage
Ordering Information
Extended Type Number U6101B-AFSG3 Package SSO20 Remarks Taped and reeled
TELEFUNKEN Semiconductors Rev. A1, 14-May-97
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Preliminary Information
U6101B
Block Diagram
12613
19 9 2 Bias circuit
1
20
12
11 8
4 10 3 17 18 14 15 VCO 16
Figure 1.
32
7 6 f 2f Divider + 90 control 13 5
Pin Description
VCCRF IF1 DECI IF2 TUD 1 2 3 4 5 20 VCC 19 GND 18 PRSO 17 PRSO 16 GNDO 15 FEDO 14 INPO 13 ELS 12 VCCPA 11 OUTI
12634
AGCT 6 AGCS 7 GND 8 INS 9
OUTQ 10
Figure 2. Pinning
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Preliminary Information
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TELEFUNKEN Semiconductors Rev. A1, 14-May-97
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Symbol VCCRF IF1 DECI IF2 TUD AGCT AGCS GND INPS OUTQ OUTI VCCPA ELS INPO FEDO GRDO PRSO PRSO GND VCC
Function RF supply voltage IF input 1 Input decoupling IF input 2 Delayed tuner AGC current out Tuner AGC take over AGC storage capacitor Ground Input select Baseband Q output Baseband I output Supply voltage power amplifier External output level set Oscillator input Oscillator feedback Oscillator ground Prescaler output Prescaler output Ground Supply voltage
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Thermal Resistance
Junction ambient Ambient temperature Input frequency Parameters Pins 13 and 14 Symbol RthJA Min. 0 390 Typ. Max. 70 520 C MHz Unit K/W
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All voltages are referred to GND (Pin 13)
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All voltages are referred to GND (Pin 13)
TELEFUNKEN Semiconductors Rev. A1, 14-May-97
Operation Range
Absolute Maximum Ratings
Supply voltage
Signal inputs external DC current Signal outputs external DC voltage Signal outputs DC current Maximum AGC voltage Tuner AGC current Maximum prescaler output current Junction temperature Storage temperature
Supply voltage
Parameters
Parameters
Pins 1, 12 and 20
Preliminary Information
Pins 1, 12 and 20 Pins 2 and 4 Pins 10 and 11 Pins 10 and 11 Pin 5 Pin 5 Pins 17 and 18 Symbol VCCRF VCCPA VCC IF1, IF2 OUT OUT TUD TUD PRSO Tj Tstg Symbol VCCRF VCCPA VCC Tamb IFin Min. 4.5 Min. -0.3 -0.3 0 -0.2 -0.3 -40 -40 Typ. Typ.
U6101B
0.2 VCC 8.0 VCCRF 2.0 10 150 125
Max. 5.5
Max. 6.0
Unit V
Unit V
mA V mA V mA mA C C
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Test conditions: VSRF = +5 V, Tamb = +25C, unless otherwise specified
3)
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Electrical Characteristics
U6101B
4 (7) Maximum amplitude External level adjust Baseband outputs Amplitude Noise figure SSB AGC range Oscillator phase noise Prescaler output amplitude Parameters Supply current IF input Impedance Operation range Sensitivity Second order intercept Third order intercept p External AGC setting, see application circuit figure 2 AGC set for minimum gain AGC set for maximum gain Note 5 10 kHz offset Pins 17 and 18 Note 4 fIF = 480 MHz Note 1 Note 1 Note 2 Test Conditions / Pins Pins 1, 12 and 20 Pins 2 and 4 Pins 10 and 11 Pin 12 Pins 10 and 11 6) 5) 4) Symbol IS Z0 fIF fIF IP2 IP3 IP3 NF see test circuit Min. -80 1.0 390 76 80 110 1.5 0.6 0.9
Note 3 Bandwidth 0.25 dB, Pins 10 and 11 fout 20 Note 4 1.0 dB, note 4 30 Relative phase error Output I vs. Q, note 3 Pins 10 and 11 Relative amplitude error Output I vs. Q, note 3 Input isolation Input 1 vs. input 2 -30 Pins 2 and 4 Spurious oscillator at outputs (LC tank, 480 MHz, internal leveled, note 6, Pins 10 and 11) Spurious at fosc VCC = 4.5 to 5.5 V <-40 Spurious at 2 fosc <-40 Oscillator frequency drift Dfosc 200
Preliminary Information
Internal AGC function activated, see application circuit figure 1
Load impedance 220 in series to 2,2 k | | 47 pF
TELEFUNKEN Semiconductors Rev. A1, 14-May-97 Typ. 40 10 -35 50 480 57 1.0 Max. 520 0.5 1.0 1.1 3 MHz dBV dBV dBV dBV dB dB dBc/Hz VPP MHz Degree MHz Unit mA dBc dBc kHz VPP VPP VPP dB dB
W
U6101B
Functional Description
The input signal is via two single ended constant gain amplifiers with selectable inputs connected to a gain controlled amplifier. The differential output signal remains of constant amplitude to provide behind splitting up optimised dynamic operation points for a pair of identical mixers. The mixer stages are driven by two orthogonal oscillator signals, to generate the I- and Qcomponents.
*
*
mize tilt. The output stages may drive complex loads up to 220 in series to 2.2 k and 50 pF in a frequency range up to 40 MHz. To avoid fast system lock in time and driving the A/D converters with defined output levels, in one channel the output signal will be peak-level detected and in an internally loop level controlled. So the output signal amplitudes are independent of frequency and characteristic of the QPSK modulation. The output level can be set via an external potentiometer (or at two fixed levels by pin programming) according the actual application. External loop control by a channel decoder generated AGC signal is provided. The DC-component of the AGC loop affects the IF input level. This signal is internally compared with a adjustable threshold and generates a tuner AGC signal. Small tolerances based on high DC operation point stability and good spurious signal suppression are performed by an internal reference voltage source.
The oscillator operates at IF-frequency. Therefore control by an on the shelf SAW resonator is possible. Using the internal 1/32 frequency divider circuit a VCO carrier recovery loop can be closed via the base band decoding system. Excellent accuracy of 0/90 phase shifting between the demodulator switching carriers is provided by a TEMIC patented phase correction circuit, which operates in a wide input frequency range. Two matched amplifiers with second order lowpass characteristic to suppress oscillator spurious ensure small gain and phase errors between both channels and mini-
Basic Application Circuit
4.7 W 10 nF 1 nF 100 pF 19 100 pF 3 2 8 100 pF 4 9 17 18 10 pF 14 15 VCO 2.2 pF 22 nH 10 pF 16 SW 2 +5 V f 2f Divider + 90 control 13 10 A/D Bias circuit 11 100 nF A/D 1 20 12
12608
+5 V 10 nF
Tuner
Channel decoder
B32
100 nF 7 6 5 100 nF
Figure 3. Internal AGC loop, output level optional changeable 0.6 Vpp to 1 Vpp by control voltage at Pin 13, VCO carrier recovery
TELEFUNKEN Semiconductors Rev. A1, 14-May-97
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Preliminary Information
U6101B
4.7 W 10 nF 1 nF 100 pF 100 pF 19 3 Bias circuit 1 20 12
12609
+5 V 10 nF
Tuner
100 pF
11 8
100 nF A/D
2
Channel decoder
100pF 4 10 9 A/D 100 nF
AGC in
SW 1
17 18
B32
VCO 16 4.7 kW f 2f Divider + 90 control 13
AGC out (PWM)
7 6 5 +5 V 100 kW 100 nF
10 pF +5 V 22 nH 10 pF 2.2 pF
14 15
Figure 4. AGC set by channel decoder, fixed VCO frequency SAW resonator carrier recovery, dual bandwidth IF filter, SW1 selects input
Package Information
Package: Super small outline plastic package, 20 pin - SSO20 Dimensions in mm
6.75 6.50 5.7 5.3 4.5 4.3
1.30 0.25 0.65 20 5.85 0.15 0.05 11 0.15 6.6 6.3
technical drawings according to DIN specifications
95 11234
1
10
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Preliminary Information
TELEFUNKEN Semiconductors Rev. A1, 14-May-97
U6101B
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. A1, 14-May-97
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Preliminary Information

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