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TDA 6900, TDA 6920 TDA 6930
Overview TV Front-End Design with ICs TDA 6900/6920/6930 Three new ICs from Siemens for TV front-ends feature a level of integration that goes well beyond the state of the art. Designers can thus cut costs while increasing functionality. For TV front-ends, Siemens now offers three matching ICs which cover the full range of video/audio IF processing, demodulation and crossbar switching functions plus stereo and audio processing (figure 1). The new chips are: * the TDA 6930 multistandard video/audio IF stage, * the TDA 6920 video switch, and * the TDA 6900 multistandard FM-IF/TV stereo decoder and audio processor. A front-end system based on these three ICs matches the TUA 6010 single-chip tuner and processes all TV signals found in multistandard applications. The internal interfaces of the chips also match. The TDA 6900 and TDA 6920 are controlled by an I2C Bus. Two ports are available in the TDA 6900 to control the TDA 6930 and its SAW circuitry. The SAW filters were developed in cooperation with Siemens Matsushita Components. The three chips can support three full SCART jacks and an S-VHS jack as well as another satellite signal source inside the TV set. Interfaces for other signal processing blocks such as teletext, PIP, equalizers or surround sound are also provided. A key design aim was to reduce the number of external components and tuning operations to a minimum. All three ICs have been implemented in the same bipolar technology with a transit frequency of 4 GHz and thus have the same basic electrical parameters and resistance to ESD.
Semiconductor Group
4
10.95
TDA 6900, TDA 6920 TDA 6930
Figure 1 Functional Diagram of the TV Front-End Concept
Semiconductor Group 5 10.95
VAKAT
((6))
Stereo Decoder and Audio Processor Preliminary Data
TDA 6900 S
Features * High decoding performance of mono/stereo/dual sound * 2 x FM demodulator on chip * Interface to NICAM and * Surround sound * Compared to digital systems - Improved S/N ratio - Extended control range - Smoother sound control * 5 Stereo and 1 mono AF input * 3 Stereo SCART outputs * Quasi stereo and stereo base width expansion * Independent headphone control * I2C Bus controlled system * Power-down mode available
Type w TDA 6900 S w New type Ordering Code Q67000-A5196
P-SDIP-64-1
Package P-SDIP-64-1
Semiconductor Group
7
10.95
TDA 6900 S
Pin Definitions and Functions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Function AF output FM 2 Input AF amplifier FM 2 Deemphasis left Deemphasis right SCART input 1 left SCART input 1 right SCART input 2 left SCART input 2 right SCART input 3 left SCART input 3 right SCART input 4 left SCART input 4 right SCART input 5 left SCART input 5 right AF input mono SCART output 1 left SCART output 1 right SCART output 2 left SCART output 2 right SCART output 3 left SCART output 3 right Ground AF output left AF input audioprocessor left AF output right AF input audioprocessor right
Semiconductor Group
8
10.95
TDA 6900 S
Pin Definitions and Functions (cont'd) Pin No. 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 Function Capacitor loudness left Capacitor loudness right Capacitor quasi-St 1 Capacitor quasi-St 2 RC network bass left RC network bass left RC network bass right RC network bass right Capacitor treble left Capacitor treble right AF output left (loudspeaker) AF output right (loudspeaker) AF output left (headphones) AF output right (headphones) Pilot tone filter input Pilot tone filter output Identification tone output Identification decoder input Capacitor identification decoder 1 Capacitor identification decoder 2 7 MHz Crystal oscillator Port output 2 Port output 1 I2C Bus SCL I2C Bus SDA + VS
Semiconductor Group
9
10.95
TDA 6900 S
Pin Definitions and Functions (cont'd) Pin No. 53 54 55 56 57 58 59 60 61 62 63 64 Function FM IF input 22 FM IF input 21 IF-bias 2 IF-bias 1 FM IF input 11 FM IF input 12 FM IF input 13 FM IF input 14 Ground FM IF Bias for AF operating point Input AF amplifier FM 1 AF output FM 1
Semiconductor Group
10
10.95
TDA 6900 S
Figure 1 Block Diagram
Semiconductor Group 11 10.95
TDA 6900 S
Function and Application The TDA 6900 S is a complete system for stereo TV-sound, controlled via I2C Bus. The device can be divided into four functional blocks: 1. Sound IF Section a) Input source selectors b) Two FM limiter amplifiers c) Multi-standard application for sound standards M, B/G, I, and D/K d) Two alignmentfree PLL FM demodulators e) Programmable field strength dependent mute control for 2nd sound carrier 2. TV-ldentification-Signal-Decoder a) Multi-standard operation for G-standard and Korean-standard1) b) Active pilot tone filter c) Incoherent pilot tone demodulator d) Phase independent filter with very narrow bandwidth for identification signal decoding e) Digital integrator for extremely low decoding error rate (no additional software necessary) f) Cyclical scanning multiplexer of stereo- or dual sound identification g) Synchronization with 7 MHz low cost crystal1) 3. Stereo Signal Processing with High Quality (better than DIN 45500; suitable for NICAM and CD) a) Matrix for G-standard and Korean-standard with I2C Bus controlled crosstalk- and level adjustment b) Five stereo AF inputs and one mono input for L-standard c) Three stereo SCART outputs d) Random switching of all inputs to all outputs with level matching stage and attached to it a clipping detector for loudspeaker path e) Independent mute for every output pair (Speaker output with zero cross detector) f) Interface for Equalizer or surroundsound in front of volume control g) Bass- and treble control (+ 16 / - 14 dB; 2 dB steps) with clipping detector h) Quasi stereo and stereo basewidth expansion i) Volume control with programmable bass loudness independent of tone control j) Balance attenuator with 1.25 dB steps k) Stereo headphones signal section with independent Ch1/Ch2 switch and volume control (1.25 dB steps)
1
For Korean Standard a different application circuit has to be used.
Semiconductor Group
12
10.95
TDA 6900 S
4. Control a) I2C Bus interface with Listen/Talk function according to the Fast Bus Specification b) Control of the IF section c) Control of the audio processor d) Control of the identification signal decoder e) Reading of the identification signal decoder, clipping detectors, and field strength detector f) Two switch outputs g) Standby mode (Power down) allows using of the SCART plugs during standby h) Test modes
Semiconductor Group
13
10.95
TDA 6900 S
Operating Range
Within the operational range the IC operates as described in the circuit description. The AC/DC characteristic limits are not guaranteed.
Parameter Supply voltage Ambient temperature Input frequency range AC/DC Characteristics Symbol min. Limit Values max. 13.2 70 20 V C kHz 8.5 0 0.01 Unit
VS TA fI
AC/DC characteristics involve the spread of values guaranteed within the specified supply voltage and ambient temperature range. Typical characteristics are the median of the production.
VS = 8.5 V; TA = 25 C
Parameter Current consumption Symbol Limit Values min. typ. 120 45 max. 150 60 mA mA 90 40 Unit Test Condition
IS
Current consumption ISstb standby mode PLL FM Demodulators Signal to noise ratio Distortion AF Switch Crosstalk attenuation
S/NAF out disAF out
68 0.01 0.1
dB %
CCIR 468 QUASIPK; WTD; Deemph = 50 s
aSW
80
dB
Semiconductor Group
14
10.95
TDA 6900 S
AC/DC Characteristics VS = 8.5 V; TA = 25 C Parameter Symbol Limit Values min. General Audio Data typ. max. Unit Test Conditions
k Noise voltage AF sw. VNSW Noise voltage VNSP
speaker
Distortion
0.1 10 15
% Vrms
Vin = 2 Vrms; f = 1 kHz
Vrms GainBal = 0 dB
Semiconductor Group
15
10.95
TDA 6900 S
Package Outlines P-SDIP-64-1 (Plastic Shrink Dual Inline Package)
Sorts of Packing Package outlines for tubes, trays etc. are contained in our Data Book "Package Information".
Dimensions in mm
Semiconductor Group 16 10.95
GPD05570
7 x 5 Video Matrix Switch Preliminary Data
TDA 6920 X
Features * Fast I2C Bus controlled (max. 400 kHz) * Cascadable (2-bus addresses) * 7 CVBS inputs, 5 outputs, 3 inputs with clamp disable by bus * 1 input selectable as Y-input (S-VHS) * 1 additional C-input (S-VHS) * Y+C operation for S-VHS, selected by bus P-DSO-28-1 * Fully ESD protected * - 60 dB max. crosstalk at 5 MHz * Low operating voltage of 7.5 V * 5 V operation is possible with reduced output signals of max. 2 Vpp * 15 MHz minimum bandwidth * Noise insensitive clamping inputs
Type
w TDA 6920 X w New type
Ordering Code Q67007-A5225
Package P-DSO-28-1
Semiconductor Group
17
10.95
TDA 6920 X
Pin Definitions and Functions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Function PIC carrier / QPT SIF II input a PIC carrier / QPT SIF II input b Ground SIF AM SIF input a AM SIF input b AGC voltage PIC carrier / QPT AM-AF output DF output AGC voltage AM FPLL-loop filter AFC output Ground Supply voltage VS1 VCO tank circuit a VCO tank circuit b Standard switch SSW 1 / AFC adjust Standard switch SSW 2 Reference voltage Video output Supply voltage VS2 (VIF section) Mean value AGC voltage Tuner AGC threshold Tuner AGC output Video IF input a Video IF input b Main AGC voltage PIC carrier / QPT SIF I input a / switch SIF I/II off PIC carrier / QPT SIF I input b / switch SIF I/II off
Semiconductor Group
18
10.95
TDA 6920 X
Figure 1 Block Diagram
Semiconductor Group 19 10.95
TDA 6920 X
Function and Application The TDA 6920 switches 7 video input sources to 5 outputs. Each output can be switched to only one input, but one input can be switched to all outputs. The C-input may be combined with one CVBS input as Y for Y+C (S-VHS) operation. Y+C operation is selected by bus. Operating Range
Within the operational range the IC operates as described in the circuit description. The AC/DC characteristic limits are not guaranteed.
Parameter Supply voltage Absolute minimum supply voltage (only usable with reduced output signals of max. 2 Vpp) Video-input frequency range - 3 dB Video-input AC-voltage (color) Video-input AC-voltage (Y, CVBS) Video-output AC-voltage Input source-impedance (clamping) Ambient temperature during operation Symbol Limit Values min. max. 13.2 V V 20 1.0 1.7 3.4 500 70 MHz Vpp Vpp Vpp C 7.5 4.5 Unit
V27 V27
fin 28, 2 ... 14 0 V28 V2 ... 14 V18 ... 26 R2 ... 14 TA 0
All voltages are referenced to ground, if not stated otherwise.
Semiconductor Group
20
10.95
TDA 6920 X
AC/DC Characteristics
AC/DC characteristics involve the spread of values guaranteed in the specified supply voltage and ambient temperature range. Typical characteristics are the median of the production.
DC Characteristics VCC = 8.5 V; TA = 25 C Parameter Total current consumption Output DC voltage (clamping) Symbol min. Limit Values typ. 42 1.8 1.0 1.8 1.8 2.4 0.33 max. mA V mA V V V A Unit
I27
V18 ... 26 Output current I18 ... 26 Input DC voltage V28 Input DC voltage (clamping) V2 ... 14 Input DC voltage (non-clamping) V 4, 6, 8 Input current (clamping) I2 ... 14
AC Characteristics VCC = 8.5 V; TA = 25 C Parameter Video bandwidth Video gain Crosstalk (0 ... 5 MHz) Input AC-voltage Input AC-voltage Output AC-voltage I2C Bus clock Symbol Limit Values min. typ. 20 2.0 - 65 0.75 1 2 400
Unit MHz dB Vpp Vpp Vpp kHz
Test Condition
max.
Pout/in - 3 dB
Vout/Vin A
Inputs 75 to ground Sinus
V28 V2 ... 14 V18 ... 26 fin 15, 16
Semiconductor Group
21
10.95
TDA 6920 X
AC Characteristics (cont'd) VCC = 8.5 V; TA = 25 C Parameter Output linearity Input resistance (non-clamping) Symbol Limit Values min. typ. 0.2 50 500 50 max. % k Unit Test Condition
DG18 ... 26 R28, 4, 6, 8
RL =
Input source- impedance R2 ... 14 (clamping) Output dyn. impedance
R18 ... 26
Semiconductor Group
22
10.95
TDA 6920 X
Figure 2 Application Circuit
Semiconductor Group 23 10.95
TDA 6920 X
Package Outlines P-DSO-28-1 (Plastic Dual Small Outline Package)
Sorts of Packing Package outlines for tubes, trays etc. are contained in our Data Book "Package Information". SMD = Surface Mounted Device Semiconductor Group 24
Dimensions in mm
10.95
GPS05123
Multistandard Video and Sound IF Preliminary Data
TDA 6930 X
Features * * * * * * * * * Multistandard application for all terrestrial standards FPLL video demodulator Delayed tuner AGC voltage output AFC signal output Quasi parallel sound Separated sound channels for AM/FM High sound performance Excellent picture quality at receipt of TTX Suitable for NICAM in all countries
P-DSO-28-1
Type
w TDA 6930 X w New type
Ordering Code Q67007-A5217
Package P-DSO-28-1
Semiconductor Group
25
10.95
TDA 6930 X
Pin Definitions and Functions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Function PIC carrier / QPT SIF II input a PIC carrier / QPT SIF II input b Ground SIF AM SIF input a AM SIF input b AGC voltage PIC carrier / QPT AM-AF output DF output AGC voltage AM FPLL-loop filter AFC output Ground Supply voltage VS1 VCO tank circuit a VCO tank circuit b Standard switch SSW 1 / AFC adjust Standard switch SSW 2 Reference voltage Video output Supply voltage VS2 (VIF section) Mean value AGC voltage Tuner AGC threshold Tuner AGC output Video IF input a Video IF input b Main AGC voltage PIC carrier / QPT SIF I input a / switch SIF I/II off PIC carrier / QPT SIF I input b / switch SIF I/II off
Semiconductor Group
26
10.95
TDA 6930 X
Figure 1 Block Diagram
Semiconductor Group 27 10.95
TDA 6930 X
Function and Application TDA 6930 X provides high class multistandard TV IF processing. It demodulates positive or negative video IF signals, demodulates AM sound IF signals, and converts FM or NICAM sound IF carriers to their intercarrier frequency. Signals for tuner AGC and AFC are also available. The tuner AGC threshold is set by means of a potentiometer, all other functions can be switched by open collector transistors. The TDA 6930 X is suitable for application in television receivers or video tape recorders for any terrestrial standard. Circuit Description The TDA 6930 X incorporates a video IF demodulation part (VIF), a AM sound demodulation part, and a section for PIC carrier recovery + FM/NICAM SIF conversion (QPT). Each path has its own four-stage capacitively coupled, controlled amplifier. AGCs The AGC for the video IF amplifier (VIF) has a peak detector for both kinds of modulation. An additional mean value detector will increase the control current for positive modulation if the input signal decreases more than 15 dB. A hysteresis keeps the high control current until the mean value increases by ca. 10 dB. The AGCs for the AM sound section and PIC carrier recovery + FM/NICAM section use envelope detectors. They have a quick charge circuit which increases the charge current by a factor of 1500 if the mean value of the signal increases by more than 10 dB. A delayed tuner AGC voltage with positive control direction is derived from the VIF-AGC via a threshold amplifier. Its take over point is set by means of an external potentiometer. The time constants of the AGCs can be set by the according external capacitor. FPLL Carrier Recovery High performance in terms of FM sound, digital sound, and videotext is obtained by means of a combined path for carrier recovery and FM/NICAM SIF (QPT). The input signal for this section is derived from the QPT SIF I/II input to overcome Nyquist slope distortions in all cases. For L'-applications the VCO frequency is switched internally, thus no external tank circuit switching is necessary. Adjustment of the tank circuit (only necessary for the AFC) is achieved by aligning the AFC voltage to a certain value, except in L'-mode. In L'-mode the AFC needs to be adjusted via control voltage at pin 19.
Semiconductor Group
28
10.95
TDA 6930 X
Video IF Demodulation A real synchronous demodulator receives an inphase carrier via an automatic phase control (APC) from the FPLL. Thus, low differential phase and gain, high intermodulation ratio, and good impulse response is achieved without any alignment. Sound Demodulation / Conversion The AM sound section uses the envelope detector of the AGC to demodulate the AM sound signal. In case of L or L' standard the AM-AF output is active, in other standards this output is inactive. The QPT-sound/PIC-carrier section gets its input signal from QPT SIF I except in L'-NICAM mode, then input QPT SIF II is active. The QPT signal is mixed with the 90-carrier from the FPLL to generate the 2nd sound IF at the according output (DF). This output is always active except on Mac standard where both sound outputs are off. According to the standard switches, FM/NICAM and/or AM, processing is performed.
Semiconductor Group
29
10.95
TDA 6930 X
Operating Range
Within the operational range the IC operates in the circuit description. The AC/DC characteristic limits are not guaranteed.
Parameter Supply voltage Supply voltage tuner AGC IF frequency range Ambient temperature during operation AC/DC Characteristics Symbol min. Limit Values max. 10 10 60 70 V V MHz C 7.5 0.6 12 0 Unit
V13/20 V23 fIF TA
AC/DC characteristics involve the spread of values guaranteed within the specified supply voltage and ambient temperature range. Typical characteristics are the median of the production.
VS = 8.5 V; TA = 0 C to 70 C
Parameter Total current Video Output Output current - I19 Output signal AM Output DC level (AM inactive) Output signal THD 0.84 1.5 mA Vpp Symbol min. - I13 + 20 Limit Values typ. 83 max. mA Unit Test Condition
V19
V7 V7
High impedance 800 0.3 mVrms % m = 80 % m = 0.3
Semiconductor Group
30
10.95
TDA 6930 X
AC/DC Characteristics (cont'd)
VS = 8.5 V; TA = 0 C to 70 C
Parameter Symbol min. DF Output Output current I8 Signal level 2.5 100 mA mVrms SC/PC = - 13 dB PC unmod. Limit Values typ. max. Unit Test Condition
V8
AFC Output Slope AFC adjust
I11/kHz V16
0.7 3 5
A/kHz V Switch at pin 16: high z (RV/Ra)
AFC adjust reference IF control range Video bandwidth
V18
V1/2, 24/25, 27/28
6 60 8
V dB MHz
B19
f - 3 dB
Semiconductor Group
31
10.95
TDA 6930 X
Figure 2 Application Circuit
Semiconductor Group 32 10.95
TDA 6930 X
Package Outlines P-DSO-28-1 (Plastic Dual Small Outline Package)
Sorts of Packing Package outlines for tubes, trays etc. are contained in our Data Book "Package Information". SMD = Surface Mounted Device Semiconductor Group 33
Dimensions in mm
10.95
GPS05123

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