TEA6100 [NXP]
FM/IF system and microcomputer-based tuning interface; FM / IF系统和微机调节界面
| 型号： | TEA6100 |
| 厂家： | 
NXP |
| 描述： | FM/IF system and microcomputer-based tuning interface |
| 文件： | 总27页 (文件大小：516K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
INTEGRATED CIRCUITS
DATA SHEET
TEA6100
FM/IF system and
microcomputer-based tuning
interface
August 1987
Product specification
File under Integrated Circuits, IC01
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
GENERAL DESCRIPTION
The TEA6100 is a FM/IF system circuit intended for
microcomputer controlled radio receivers. The circuit
includes highly sensitive analogue circuitry. The digital
circuitry, including an I2C bus, controls the analogue
circuitry and the AM/FM tuning and stop information for the
microcomputer.
• Signal dependent 'soft' muting circuit; externally
adjustable
Features
• Reference voltage output (FM mode only)
• 4-stage symmetrical IF limiting amplifier
• Software selectable AM or FM input
• 8-bit AM/FM frequency counter with selectable counter
resolution
• Symmetrical quadrature demodulator
• Possibility to measure the AM IF frequency at 460 kHz
• Single-ended LF output stage
(250 Hz resolution) and 10,7 MHz (500 Hz resolution)
• D.C. output level determined by the input signal
• Semi-adjustable AM and FM level voltage
• Multi-path detector/rectifier/amplifier circuitry
• 3-bit level information and 3-bit multi-path information
• Reference frequency can be directly connected to the
reference frequency output of a frequency synthesizer
(TSA6057, 40 kHz) .
PACKAGE OUTLINE
20-lead DIL; plastic (SOT146); SOT146-1; 1996 August 13.
August 1987
2
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
QUICK REFERENCE DATA
PARAMETER
Supply voltage
CONDITIONS
SYMBOL
VP1, VP2
P1 + IP2
MIN.
TYP.
8,5
MAX.
UNIT
−
−
−
−
V
Supply current
I
35
mA
µV
dB
FM/IF sensitivity
−3 dB before
limiting
Vi
−
−
−
15
−
−
−
Signal plus noise
to noise ratio
∆f = 75 kHz;
VI = 10 mV
(S + N)/N
85
Audio output voltage
after limiting
∆f = 22,5 kHz
Vo
200
mV
AM suppression
VIFM = 600 µV
to 600 mV;
m = 0,3
AMS
−
60
−
dB
Frequency counter
sensitivity
AM
pin 19,
f = 10,7 MHz
f = 460 kHz
pin 18,
Vi(AM)
Vi(AM)
−
−
45
20
−
−
µV
µV
FM
f = 10,7 MHz
reference
Vi(FM)
−
45
−
µV
Resolution of the
frequency counter
frequency of
40 kHz;
AM
FM
IF = 460 kHz
IF = 10,7 MHz
fs (AM)
fs (AM)
fs (FM)
−
−
−
250
500
6,4
−
−
−
Hz
Hz
kHz
August 1987
3
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Fig.1 Block diagram.
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
PINNING
1
VP1
analogue supply voltage
mute input
2
MUTE IN
LA OUT
RT/A IN
RT/A OUT
Fref
3
level amplifier output
rectifier/amplifier input
rectifier/amplifier output
reference frequency input
digital ground
4
5
6
7
DGND
VP2
8
digital supply voltage
serial clock line; I2C bus
serial data line; I2C bus
audio output signal
9
SCL
10
11
12
SDA
LF OUT
Q-DET
phase shift for quadrature
detector
13
Q-DET
phase shift for quadrature
detector
14
15
16
17
18
19
20
LADJ
level amplifier adjustment
reference voltage
decoupled feedback
decoupled feedback
FM/AM IF input
Vref
FB DEC
FB DEC
INPUT 1
INPUT 2
AGND
AM/FM IF input
Fig.2 Pinning diagram.
analogue ground
FUNCTIONAL DESCRIPTION (see Figs 1 and 16)
The IF amplifier consists of four balanced limiting amplifier stages, two separate inputs (AM and FM) and one output.
Software programming (see Table 2; Figs 4 and 5) allows the input signals (AM/FM) to be inserted on either input (pin
18 or 19). The output drives the frequency counter and via the mute stage, drives the quadrature detector. The output of
the quadrature detector is applied to an audio stage (which has a single-ended output). The AM/FM level amplifier, which
is driven by 5 IF level detectors, generates a signal dependent d.c. voltage. The level output voltage is used internally to
control the mute stage and, if required, the signal can be used externally to control the stereo channel separation and
frequency response of a stereo decoder. The signal is also feed to the analogue-to-digital converter (ADC). Due to the
front-end spread in the amplification, the level voltage is made adjustable (LADJ, pin 14). The level voltage amplifier
controls the mute stage and this insures the −3 dB limiting point remains constant, independent of the front-end spread.
AM and FM mode have different front-end circuitry, therefore LADJ must be adjustable for both inputs.
The output voltage of the level amplifier is dependent upon the field strength of the input signal. The multi-path of the FM
signal exists in the AM modulation of the input signal. The following method is used to determine the level information
and the amount of multi-path (as a DC voltage):
• the IF level detector detects the multi-path and feds the signal, via the level amplifiers, to the external bandpass filter
(pin 3) and ADC1
• the signal is then fed to an internal rectifier
• the rectified signal is then fed to an amplifier, so at pin 5 the DC level information is externally available and internally
used by ADC2
In the FM mode, the DC information concerning the multi-path is available at pin 5 and the level information is available
at pin 3.
August 1987
5
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
In the AM mode, the level information at pin 3 cannot be directly used owing to AM modulation on the output signal of
the level amplifier. This signal requires filtering, which is achieved by the following method:
• the multiplexer is switched to a position which causes the signal to be applied to the attenuator
• after attenuation the signal is fed to an amplifier (the resultant gain of attenuator and amplifier is unity), after
amplification the signal is filtered by an internal resistor and external capacitor
• after filtering the signal is applied to ADC2 and is externally available
In AM mode pin 5 contains the level information.
The voltages on pin 3 and 5 are converted into two 3-bit digital words by the ADC, which can then be read out by the
I2C bus. The meaning of the 3- bit words is shown in Table 1.
Table 1 3-bit words
POSITION
WORD
FM
AM
1
2
multipath level without modulation
level level with modulation
The FM modulated signal is converted into an audio signal by the symmetrical quadrature detector. The main advantage
of such a detector is that it requires few external components.
An FM signal requires good AM suppression, and as a result, the IF amplifiers must act as limiters. To achieve good
suppression on small input signals the IF amplifiers must have a high gain and thus a high sensitivity. High sensitivity is
an undesirable property when used in car radio applications, this problem is solved by having an externally adjustable
mute stage to control the overall sensitivity of the device.
The IF mute stage is controlled by the level amplifier (soft muting) and is only active in FM mode. If the input falls below
a predetermined level, the mute stage becomes active. To avoid the 'ON/OFF' effect of the audio signal due to
fluctuations of the input signal, the mute stage is activated rapidly but de-activated slowly. The mute stage is de-activated
slowly, via a current source and an external capacitor at pin 2, to avoid aggressive behaviour of the audio signal. It is
possible to adjust the '−3 dB limiting point' of the audio output via the level voltage due to the level signal being externally
adjustable. If hard muting is required then pin 2 must be switched to ground.
The 8-bit counter allows accurate stop information to be obtained, because exact tuning is achieved when the measured
frequency is equal to the centre frequency of the IF filter.
To measure the input frequency, the number of pulses which occur in a defined time must be counted. This defined time
is refered to as 'window'. A wide window indicates a long measuring time and therefore a high accuracy. The counter
resolution is defined as Hertz per count. Due to the TEA6100 having to measure the IF frequencies of AM and FM, the
counter resolution must be adjustable (different channel spacing). The counter resolution depends on the setting of
dividers 1 (N1), divider 2 (N2) and the reference frequency (Fref). The divider ratios of N1 and N2 are controlled by
software (see section PROGRAMMING INFORMATION). In Table 3 the window and counter resolution has been
calculated for a reference frequency of 40 kHz. The accuracy is controlled by bit 7 of the input word. Although the
resolution is the same for bit 7 = logic 0 and bit 7 = logic 1, the width of the window doubles when bit 7 = logic 1.
• bit 7 = 0, accuracy = ± counter resolution
• bit 7 = 1, accuracy = ± 1⁄2 counter resolution
August 1987
6
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
Communication between TEA6100 and the microcomputer is via a two wire bidirectional I2C bus. The power supply lines
are fully isolated to avoid cross talk between the digital and analogue parts of the circuit.
Fig.3 Input data format waveforms.
Table 2 Input bits
BIT
FUNCTION
LOGIC 0
32 kHz
LOGIC 1
40 kHz
SEE Fig.5 AND 6
1
2
3
4
5
6
7
8
reference frequency
IF mode
A
B
C
D
E
F
AM
FM
IF input
pin 19
460 kHz
AM
pin 18
10,7 MHz
FM
counter input
counter mode
resolution
divide by 8
LOW
divide by 1
HIGH
ON
accuracy
G
H
test mode
OFF
August 1987
7
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Fig.4 Output data format waveforms.
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
Fig.5 Switch positions, analogue part (switches drawn in logic 0 state).
August 1987
9
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Fig.6 Switch positions, digital part (switches drawn in logic 0 state, see Tables 2 and 3).
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
Table 3 Possible window settings and counter resolutions with a 40 kHz reference frequency (see Figs 5 and 6)
POSITION OF
SWITCH
COUNTER
RESOLUTION
Hz / COUNT
IF
READ OUT BY
IF FREQUENCY
(HEX)
WINDOW (ms)
FREQUENCY
(kHz)
RANGE (kHz)
ADEFG
MIN.
MAX.
00000
10000
00001
10001
00100
10100
00101
10101
00010
10010
00011
10011
00110
10110
00111
10111
01000
11000
01001
11001
01100
11100
01101
11101
01010
11010
01011
11011
01110
11110
01111
11111
25,6
32,0
51,2
64,0
128,0
160,0
256,0
320,0
3,2
39,1
460,0
4F
CF
4F
CF
C3
36
C3
36
0F
7F
0F
7F
30
3F
30
3F
2F
E7
2F
E7
C3
36
C3
36
AB
C2
AB
C2
30
7F
30
7F
456,914
453,531
456,914
453,531
265,000
416,800
256,000
416,800
455,312
428,250
455,312
428,250
76,000
466,875
461,500
466,875
461,500
520,000
620,800
520,000
620,800
535,000
492,000
535,000
492,000
2116,000
1688,800
2116,000
1688,800
31,3
460,0
39,1
460,0
31,3
460,0
1000,0
800,0
1000,0
800,0
312,5
250,0
312,5
250,0
8000,0
6400,0
8000,0
6400,0
625,0
500,0
625,0
500,0
1000,0
800,0
1000,0
800,0
5000,0
4000,0
5000,0
4000,0
8000,0
6400,0
8000,0
6400,0
460,0
460,0
460,0
460,0
460,0
4,0
460,0
6,1
460,0
8,0
460,0
16,0
20,0
32,0
40,0
25,6
32,0
51,2
64,0
128,0
160,0
256,0
320,0
3,2
460,0
460,0
56,800
460,0
76,800
460,0
56,800
10700,0
10700,0
10700,0
10700,0
10700,0
10700,0
10700,0
10700,0
10700,0
10700,0
10700,0
10700,0
10700,0
10700,0
10700,0
10700,0
10670,625 10830,000
10584,500 10712,000
10670,625 10830,000
10584,000 10712,000
10505,000 10760,000
10656,800 10860,800
10505,000 10760,000
10656,800 10860,000
9845,000 11120,000
9924,000 10944,000
9845,000 11120,000
9924,000 10944,000
10316,000 12356,000
9887,200 11519,200
10316,000 12356,000
9887,200 11519,200
4,0
6,4
8,0
16,0
20,0
32,0
40,0
August 1987
11
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134)
PARAMETER
CONDITIONS
SYMBOL
VP1, VP2
MIN.
MAX.
13,2
UNIT
Supply voltage
pins 1 and 8
0
V
Total power dissipation
Ptot
see Fig.7
Storage temperature range
Operating ambient temperature range
Tstg
Tamb
−65
−30
+150
+85
°C
°C
THERMAL RESISTANCE
From junction to ambient
Rth j-a
70 K/W
Fig.7 Power derating curve.
DC CHARACTERISTICS (note)
VP1 = VP2 = 8,5 V; Tamb = 25°C; all currents positive into the IC; unless otherwise specified
PARAMETER
Supply voltage
CONDITIONS
SYMBOL
VP1, VP2
MIN.
TYP.
MAX.
UNIT
pins 1 and 8
7,5
8,5
12
V
Supply current
FM mode
V
ADJ > 2,4 V
IP1
IP1
IP2
Pd
−
−
−
−
19
15
25
25
23
−
mA
mA
mA
mW
AM mode
VADJ > 2,4 V
digital part
16
Power dissipation
280
August 1987
12
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
AC CHARACTERISTICS (note 1)
VP = 8,5 V; Vi(FM) = 1 mV; f = 10,7 MHz; ∆f = 22,5 kHz; fm = 1 kHz; FM mode; unless otherwise specified
PARAMETER
CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
IF amplifier, quadrature
detector and LF amplifier
output
pin 11
Sensitivity
−3 dB before limiting;
inactive mute
Vi(FM)
−
−
15
12
30
µV
Sensitivity
S/N = 26 dB;
inactive mute
Vi(FM)
−
µV
Signal plus noise
to noise ratio
Vi(FM) = 10 mV;
bandwidth = 0,3 to
15 kHz;
∆f = 75 kHz
AM suppression
> 40 db
(S + N)/N
−
−
85
−
−
dB
IF input range
Vi(FM)
0,09 to
1000
mV
Audio output
voltage after
limiting
∆f = 22,5 kHz
Vo
160
200
240
mV
%
Total harmonic
distortion for
single tuned
circuit
∆f = 75 kHz
THD
−
0,65
−
AM suppression
note 2; see Figs 8, 9 and 10;
V
i(AM) range = 200 µV
to 600 mV
i(AM) range = 200 µV
AMS
AMS
SVRR
−
60
55
40
−
−
−
dB
dB
dB
V
to 600 µV
−
Supply voltage
ripple rejection
200 Hz; 20 log (Vi / Vo)
38
IF counter inputs
Frequency counter
sensitivity
minimum input voltage
for a readout ±1 bit;
10,7 MHz
FM mode
Vi(FM)
Vi(AM)
Vi(AM)
−
−
−
−
−
−
60
60
45
µV
µV
µV
AM mode
10,7 MHz
AM mode
460 kHz
Maximum input
voltage
Vi
−
−
1
V
August 1987
13
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
PARAMETER
CONDITIONS
see Fig.11
SYMBOL
MIN.
TYP.
MAX.
UNIT
FM level performance
Output voltage
adjustment range
Vi(FM) = 0 V;
pins 3 and 14
VLFM
−
0,1 to 4,6
−
V
V
Maximum output
voltage
pins 3 and 14
VLFM
GADJ
VP−1,5
−
−
−
Adjustable gain
Level voltage slope
V
V
V
i(FM)/VADJ
−
−2
dB
ADJ = 2,4 V;
i(FM) = 100 to 10 mV
Si(FM)
1,4
1,6
1,8
V/dec(6)
Ω
Output impedance
of level amplifier
VLFM > 1 V
|Zo|
−
100
−
see Fig.12
AM level
performance
Output voltage
adjustment range
Vi(AM) = 0 V;
pins 5 and 14
VLFM
−
0,1 to 4,6
−
V
Vi(AM) = 10 mV;
pins 5 and 14
Vi(AM) / VADJ
VLAM
GADJ
6
−
−
−
V
Adjustable gain
−
−2
dB
Level voltage slope
VADJ = 2,4 V;
Vi(FM) = 100 to 10 mV
Si(AM)
1,3
1,5
1,7
V/dec(6)
VLFM; pin 3;
see Fig.13
IF soft muting
Mute operating
range
VLFM
−
0,1 to 2,5
−
V
Mute voltage
−3 dB output
attenuation
VLFM
1,20
1,45
19
1,75
V
Maximum muting
IF hard muting
Mute voltage
VLFM = 0,1 V
MUTE; pin 2
VMUTE
−
−
dB
V
−60 dB output
attenuation
VMUTE
−
460
−
mV
Mute discharge
current
V
MUTE = 1 V;
LEVEL = 0 V;
V
mute ON; pin 2
VMUTE = 0 V;
mute OFF
+I2
−
−
270
1,5
−
−
µA
µA
Mute charging
current
−I2
August 1987
14
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
PARAMETER
CONDITIONS
SYMBOL
MIN.
TYP.
MAX.
UNIT
Rectifier/amplifier
Input impedance
Conversion gain
AC to DC
pin 4
|Zi|
7
10
13
kΩ
pins 4 and 5;
bandwith = 100 Hz to
120 kHz;
20 log VO(MP) (d.c.)/
V
i(MP) (a.c.)
GA
−
−
30
−
−
dB
V
DC output voltage
range
VO(MP)
0,2 to 6
200
see Fig.16; note 3
Output characteristics
Discharge current
Output ripple in
AM mode (peak-
to-peak value)
Io
−
−
−
µA
fm = 200 Hz; m = 0,8;
Vi(AM) range = 100 µV
to 30 mV
Vripple
300
400
mV
see Figs 14 and 15; note 4
Multi-path output
pin 15, FM only
Reference voltage
output
Output voltage
Output sink current
Output impedance
Output charge
current
Vref
+I15
|ZO|
−
−
−
4,4
−
−
V
1,5
10
mA
Ω
−
−I15
Vref
|ZO|
5
−
−
−
−
−
−
mA
V
Output voltage
Output impedance
AM mode
AM mode
0
14
kΩ
I2C bus data format
see Fig.3 and 4;
Table 2
multi-path and level
information, note 5
3-bit ADC
Trip level LOW
Trip level HIGH
VTL
VTH
1,20
4,25
1,45
4,50
1,75
4,75
V
V
pin 6
Reference
frequency input
Reference range
Input voltage LOW
Input current HIGH
Fref
VIL
IIH
−
−
5
−
−
−
40
0,4
−
kHz
V
µA
August 1987
15
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
Notes
1. All characteristics are measured from the circuit shown in Fig.16.
2. Conditions for this parameter are:
20 log Vo(FM); m = 0,3 or 20 log Vo(AM); m = 0,3.
3. Voltage source followed by diode and resistor.
4. A DC shift can be achieved by connecting a 1,8 MΩ resistor between pin 4 and pin 15.
5. Step size between trip levels:
(VTH − VTL) / 6 ± 0,07 V.
6. V/dec = voltage per decade.
August 1987
16
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
(1) Audio (∆f = 22,5 kHz and fmod = 1 kHz) for VADJ = 0 V.
(2) Noise (with dBA filter) for VADJ = 0 V.
(3) AM suppression (m = 0,3 and fmod = 1 kHz) for VADJ = 0 V.
Fig.8 Audio output voltage performance plotted against input signal, Vi(FM)
.
(1) Audio (∆f = 22,5 kHz and fmod = 1 kHz) for VADJ = 2,4 V.
(2) Noise (with dBA filter) for VADJ = 2,4 V.
Fig.9 Audio output voltage performance plotted against input signal, Vi(FM)
.
August 1987
17
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
Fig.10 Total harmonic distortion; ∆f = 75 kHz, fmod = 1 kHz and VADJ = O V.
(1) VADJ = 1,4 V.
(2) ADJ = 2,4 V.
(3) VADJ = 3,4 V.
V
Fig.11 Level voltage output (VLFM) plotted against IF input signal, Vi(FM); IF = 10,7 MHz.
August 1987
18
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
(1) VADJ = 1,4 V.
(2)
VADJ = 2,4 V.
(3) VADJ = 3,4 V.
Fig.12 Level voltage output (VLAM) plotted against IF input signal, Vi(AM); IF = 10,7 MHz or 460 kHz.
Fig.13 Soft muting plotted against level output voltage; Vi(FM) = 1 mV and ∆f = 22,5 kHz.
August 1987
19
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
(1) mod = 0,2
(2) mod = 0,3
(3) mod = 0,4
Fig.14 Multi-path output plotted against IF input signal, Vi(FM); fmod = 3 kHz (AM, no FM modulation), VADJ = 2,4 V
and 1,8 MΩ resistor connected between pin 4 and pin 15.
(1) mod = 0,2
(2) mod = 0,3
(3) mod = 0,4
Fig.15 Multi-path output plotted against IF input signal, Vi(FM); fmod = 3 kHz (AM, no FM modulation), VADJ = 2,4 V.
August 1987
20
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
APPLICATION INFORMATION
Fig.16 Application diagram.
August 1987
21
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
Fig.17 Track side of printed circuit board.
Fig.18 Component side of printed circuit board.
22
August 1987
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
Double tuned circuit
R1 = 5,1 kΩ, R2 = 1,5 kΩ
C1 = C2 = 150 pF (n = 220)
C3 = C4 = 10 pF
L1 = L2 = 1,6 µH
Fig.19 Double tuned demodulator circuit.
Alignment of the circuit is obtained with an IF input signal > 200 µV. Tuning the circuit is performed by, detuning L2,
adjusting L1 to obtain a minimum distortion level and then adjusting L2 to obtain a minimum distortion level.
Fig.20 Total harmonic distortion plotted against IF detuning; for ∆f = ± 75 kHz, fmod = 1 kHz and VO = 500 mV.
August 1987
23
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
PROGRAMMING INFORMATION
Converting the read out of the counters into frequency
The counter resolution at the input is defined as:
• resolution = divider ratio of N2/window
For every increment of the counter the counted frequency increases relative to the resolution in Hertz, as shown in
example:
• window = 20 ms; N2 = 128; IF frequency = 10,7 MHz; resolution = 128/0,02 = 6,4 kHz per count
The counter consists of 8 bits. Therefore, the maximum frequency range that can be counted is
256 × resolution = 1,6384 MHz. In the example the frequency to be counted is 10,7 MHz, therefore, the counter will
overflow (in the example above, 7 times). The real measured frequency is:
• freal = (read out + overflow × 256) × resolution
The overflow indicates the off-set on the frequency scale which must be added to the read out. Due to the bandwidth of
the IF filter, the frequencies at the input to the TEA6100 are known, for example:
• IF filter for FM has a center frequency of 10,7 MHz and −3 dB bandwidth of 300 kHz. Only the frequencies of 10,7 MHz
± 150 kHz occur at the input of the TEA6100. For this reason it is not necessary to count the overflow.
The read out of the counter has to be translated into frequency. This translation depends upon the counter resolution.
The preferred way to calculate the input frequency is to:
• calculate the read out of the target IF frequency. Compare this value with that of the measured read out and multiply
the difference by the resolution.
The formulae for calculating the target IF read out and the resolution are as follows (A, D, E, F and G refer to the bits of
the I2C bus input data as shown in Fig.3 and 4 and to the counter/timer block diagram shown in Fig.6. An, Dn, En, Fn
and Gn are inverted values of the variables A, D, E, F and G. Table 3 shows the following formulae calculated for a
reference frequency of 40 kHz):
• N1 = (An × 4 + A × 5) × (En × 4 + E × 5) × 8 × (2[E × 2 + G × 1]) × (F × 1 + Fn × 8)
• Window (T) = N1/Fref
• N2 = (E × 16 × 8 + En × [Dn × 1 +D × 16]) × (G × 2 + Gn × 1)
• Target decimal read out (TDEC) = T × (TIFF/N2 + (E × 247 + En × 79). TIFF is the symbol for target IF frequency
• Target read out hexadecimal (THEX), convert the target decimal read out to hexadecimal and use the 2 least
significant digits (Do not use overflow value). The symbol for measured hexadecimal is MHEX
• Resolution (R) = N2/T
• Measured frequency (FI) = (TIFF) + R × (MHEX − THEX).
Note
Care should be taken if TIFF + 1⁄2 filter bandwidth is greater than the frequency for the read out of hexadecimal value FF,
or if TIFF − 1⁄2 filter bandwith is less than the frequency at read out for hexadecimal value 00.
• Counter accuracy (AW and AN), with bit 7 (G) the accuracy can be chosen with the same resolution. If bit 7 is logic 1
the accuracy is HIGH and if bit 7 is logic 0 then the accuracy is LOW.
bit 7 = 0, AN = ± (N2/T)
bit 7 = 1, AW = ± (1⁄2 × N2/T)
August 1987
24
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
Example
The example uses the following values:
TIFF = 10,7 MHz; accuracy = LOW (G = 0); Fref = 40 kHz (A = 1); IF frequency = 10, 7 MHz (D = 1);
resolution = N1 (F = 1) and counter mode = FM (E = 1)
N1 = (0 × 4 + 1 × 5) × (0 × 4 + 1 × 5) × 8 × (2[1 × 2 + 0 × 1]) × (1 × 1 + 0 × 8) = 800
T = 800/40 = 20 ms
N2 = (1 × 16 × 8 + 0 × [1 × 1 + 0 × 16]) × (0 × 2 + 1 × 1) = 128
TDEC = 20 × 10,7/128 + (1 × 247 + 0 × 79) = 1919
THEX; 1919 is hexadecimal 77F and the least significant 2 digits are 7F, so THEX = 7 F
R = 128/20 = 6400 Hz/count
Assume the readout is '6E', the measured frequency will be:
• FI = 10,7 + (6E − 7F) × 6400 = 10,59 MHz
Assume the readout is '83', the measured frequency will be:
• FI = 10,7 + (83 − 7F) × 6400 = 10,726
August 1987
25
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
PACKAGE OUTLINE
DIP20: plastic dual in-line package; 20 leads (300 mil)
SOT146-1
D
M
E
A
2
A
A
1
L
c
e
w M
Z
b
1
(e )
1
b
M
H
20
11
pin 1 index
E
1
10
0
5
10 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
(1)
A
A
A
(1)
(1)
Z
1
2
UNIT
mm
b
b
c
D
E
e
e
1
L
M
M
H
w
1
E
max.
min.
max.
max.
1.73
1.30
0.53
0.38
0.36
0.23
26.92
26.54
6.40
6.22
3.60
3.05
8.25
7.80
10.0
8.3
4.2
0.51
3.2
2.54
0.10
7.62
0.30
0.254
0.01
2.0
0.068
0.051
0.021
0.015
0.014
0.009
1.060
1.045
0.25
0.24
0.14
0.12
0.32
0.31
0.39
0.33
inches
0.17
0.020
0.13
0.078
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
REFERENCES
OUTLINE
EUROPEAN
PROJECTION
ISSUE DATE
VERSION
IEC
JEDEC
EIAJ
92-11-17
95-05-24
SOT146-1
SC603
August 1987
26
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
with the joint for more than 5 seconds. The total contact
time of successive solder waves must not exceed
5 seconds.
SOLDERING
Introduction
There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.
The device may be mounted up to the seating plane, but
the temperature of the plastic body must not exceed the
specified maximum storage temperature (Tstg max). If the
printed-circuit board has been pre-heated, forced cooling
may be necessary immediately after soldering to keep the
temperature within the permissible limit.
Repairing soldered joints
This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our “IC Package Databook” (order code 9398 652 90011).
Apply a low voltage soldering iron (less than 24 V) to the
lead(s) of the package, below the seating plane or not
more than 2 mm above it. If the temperature of the
soldering iron bit is less than 300 °C it may remain in
contact for up to 10 seconds. If the bit temperature is
between 300 and 400 °C, contact may be up to 5 seconds.
Soldering by dipping or by wave
The maximum permissible temperature of the solder is
260 °C; solder at this temperature must not be in contact
DEFINITIONS
Data sheet status
Objective specification
Preliminary specification
Product specification
This data sheet contains target or goal specifications for product development.
This data sheet contains preliminary data; supplementary data may be published later.
This data sheet contains final product specifications.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.
PURCHASE OF PHILIPS I2C COMPONENTS
Purchase of Philips I2C components conveys a license under the Philips’ I2C patent to use the
components in the I2C system provided the system conforms to the I2C specification defined by
Philips. This specification can be ordered using the code 9398 393 40011.
August 1987
27
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