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TV-Stereocoder
TDA 6621
Bipolar IC Features
q q q q q q q
P-DIP-18-1
Type TDA 6621
Ordering Code Q67000-A5149
Package P-DIP-18-1
The TDA 6621 is a single-chip TV-A2-Stereosystem Coder. The circuit can be partitioned into two functional blocks: 1. Stereo Matrix a) Mono, Dual, Stereo signal processing 2. Pilottone Generator a) Line locked PLL for generating all necessary frequencies b) External identification tone filter for filtering the square wave identification output signal to sinusoidal waveform c) AM-modulator with adjustment for modulation d) Pilottone filter The status control is handled via two TTL compatible control inputs. Application Headstations of central aerial television (CATV).
Semiconductor Group
1
11.94
TDA 6621
Pin Configuration (top view) P-DIP-18-1
Semiconductor Group
2
TDA 6621
Pin Functions Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Symbol I AF1 Bias AF I AF2 I Pilot Q Pilot Q AM Q AF1 Q AF2 Function AF-input tone 1 Bias for AF-operating point AF-input tone 2 Pilottone filter in (inverting input) Pilottone filter output AM modulator pilottone output AF-output tone 1 AF-output tone 2 Reference voltage output 6 V DC Modulation depth adjustment + VS supply voltage Dual control input Stereo control input Line frequency input Identification tone output (square wave) Identification tone input Loop filter PLL Ground
VREF Q
MOD +VS I Dual I Stereo I Freq Q Tone I Tone PLL GND
Semiconductor Group
3
TDA 6621
Block Diagram
Semiconductor Group 4
TDA 6621
Circuit Description Matrix The audio matrix is generating the correct audio signals for the three possible operation modes. In mono operation the tone 1 input signal is fed to both AF outputs. In dual mode both audiosignals are appearing at both outputs. When stereo operation is selected, a (L+R)/2 signal is generated and fed to the tone 1 output, the right AF-Signal is switched to tone 2 output. Pilottone Generator The pilottone generator consists of a PLL circuitry and an AM modulator. The PLL is locked with the 15625 Hz line frequency and is generating the unmodulated pilottone and a square wave identification tone. This identification tone has to be filtered in an external filter to a sinusoidal wave form. This is fed into the AM modulator, which generates the AM modulated pilottone. A DC control voltage is adjusting the modulation depth. A high speed OP amp is available for filtering the pilottone harmonics and for level matching. The status control of the stereocoder happens via two TTL compatible control inputs. The truth table of the control inputs:
Stereo Control Mono mode Stereo mode Dual mode Not allowed 0 1 0 1
Dual Control 0 0 1 1
Tone 1 Output Mono (L+R)/2 Tone 1 -
Tone 2 Output Mono R Tone 2 -
Pilottone Mod. Not mod. 117 Hz 274 Hz -
Semiconductor Group
5
TDA 6621
Absolute Maximum Ratings TA = 0 to 70 C Parameter Symbol min. Max. DC-voltage Max. DC-voltage Max. DC-voltage Max. DC-voltage Max. DC-current Max. DC-current Max. DC-current Max. DC-current Max. DC-current Max. DC-voltage Supply voltage Max. DC-voltage Max. DC-voltage Max. DC-voltage Max. DC-current Max. DC-voltage Max. DC-current Junction temperature Storage temperature Thermal resistance Operational Range Supply voltage Ambient temperature Input frequency range Limit Values max. 14 14 14 14 2 2 2 2 2 14 14 14 14 14 2 14 1 - 150 + 125 59 V V V V mA mA mA mA mA V V V V V mA V mA C C K/W Unit
V1 V2 V3 V4 I5 I6 I7 I8 I9 V10 V11 V12 V13 V14 I15 V16 I17 Tj Tg RthSU
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
VS TA fl
10 0 0.01
+ 13.2 70 20
V C kHz
Semiconductor Group
6
TDA 6621
AC/DC Characteristics VS = 12 V; TA = 25 C, in accordance with test circuit 1. Parameter Symbol Limit Values min. typ. max. Current consumption A. Matrix Gain Gain Gain Gain Gain Gain Gain Max. input voltage Max. input voltage Max. output voltage Max. output voltage Crosstalk attenuation Distortion Distortion Matrix error Signal/noise ratio Signal/noise ratio Unit Test Test Condition Circuit
I11
26
mA
G7-1 G8-1 G7-1 G8-3 G7-1 G7-3 G8-3 V1 V3 V7 V8 across k7 k8 as/N7 as/N8
2 2 2 2 75
0 0 0 0 -6 -6 0
dB dB dB dB dB dB dB Vrms Vrms Vrms Vrms
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
Mono Mono Mono Mono Stereo Stereo Stereo
k7 1 % k8 1 % k7 1 % k8 1 %
Dual Vin = 250 mVrms Vin = 250 mVrms Stereo V1 = 600 mVrms V3 = 600 mVrms
80 0.2 0.2 2 97 97
VStereo
dB % % % dB dB
Semiconductor Group
7
TDA 6621
AC/DC Characteristics (cont'd) VS = 12 V; TA = 25 C, in accordance with test circuit 1. Parameter Symbol Limit Values min. typ. max. B. Pilottone Generator VCO-voltage PLL Identification tone output voltage Pilot voltage Identification tone input voltage Max. gain pilot filter Threshold line input Threshold line input Threshold control input Threshold control input Reference voltage C. Design Hints Input resistance Output resistance Input resistance Input resistance Output resistance Output resistance Unit Test Test Condition Circuit
V17 V15 V6 V16 G5 V14L V14H V12,13L V12,13H V9
3 2 400
V Vpp mVpp
U9-10 = 1 V Mono
1 12 0 3.5 0 2.4 6 1.5
VS
1 5.5
Vpp dB V V V V V
m = 50 %
R1,3 R7,8 R14 R16 R15 R6
20 200 7 24 200 15
k k k k
Semiconductor Group
8
TDA 6621
Test Circuit
Semiconductor Group 9
TDA 6621
Application Circuit 1
Semiconductor Group 10
TDA 6621
Application Circuit 2
PLL-Filter (pin 17)
Semiconductor Group 11
TDA 6621
Identification Tone In/Out (pin 15/16)
Line Input (pin 14)
Semiconductor Group
12
TDA 6621
Control Inputs (pin 12/13)
Modulation Depth (pin 10)
Semiconductor Group
13
TDA 6621
Reference Voltage (pin 9)
AF-Output (pin 7/8)
Semiconductor Group
14
TDA 6621
Pilot Tone Output (pin 6)
54 kHz-Filter (pin 4/5)
Semiconductor Group
15
TDA 6621
AF-Inputs (pin 1/3)
AF Bias (pin 2)
Semiconductor Group 16
TDA 6621
Package Outlines
P-DIP-18-1 (Plastic Dual In-Line Package)
Sorts of Packing Package outlines for tubes, trays etc. are contained in our Data Book "Package Information" Dimensions in mm
Semiconductor Group
17
GPD05035

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