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PDF TDA9614H Data sheet ( Hoja de datos )
| Número de pieza | TDA9614H | |
| Descripción | Audio processor for VHS hi-fi and linear audio | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TDA9614H
Audio processor for VHS hi-fi
and linear audio
Preliminary specification
File under Integrated Circuits, IC02
1995 Mar 21
Philips Semiconductors
1 page  
Philips Semiconductors
Audio processor for VHS hi-fi
and linear audio
Preliminary specification
TDA9614H
5 PINNING
SYMBOL
SAP
TUNL
TUNR
CINL
CINR
EXT1L
EXT1R
EXT2L
EXT2R
EXT3L
EXT3R
RAF
VDDD
SDA
SCL
VSSD
RFCAGC
RFCOUT
LINE2L
LINE2R
LINEL
LINER
DCOUTL
DCOUTR
HPOUTL
HPOUTR
LINAGC
LININ
LINOUT
EQSW
RECEQ
LINREC
RECOUT
PBIN
RESSW
PBDC
PIN DESCRIPTION
1 Second Audio Program (SAP) input.
2 Left channel tuner input.
3 Right channel tuner input.
4 Left channel cinch input.
5 Right channel cinch input.
6 Left channel external 1 input.
7 Right channel external 1 input.
8 Left channel external 2 input.
9 Right channel external 2 input.
10 Left channel external 3 input.
11 Right channel external 3 input.
12 Record/playback switch drive output for head amplifier control or input for overruling
the I2C-bit RAF.
13 Digital supply voltage for I2C-bus (+5 V).
14 Data input/output for I2C-bus.
15 Clock input for I2C-bus.
16 Digital ground for I2C-bus.
17 RF converter AGC-time constant.
18 RF converter drive output.
19 Line 2 left output (e.g. decoder output).
20 Line 2 right output (e.g. decoder output).
21 Line output left.
22 Line output right.
23 VU meter drive output left.
24 VU meter drive output right.
25 Headphone drive output left.
26 Headphone drive output right.
27 Linear audio AGC-time constant.
28 Audio input for linear audio to REC equalizer and output select.
29 Audio output from AGC or PB equalizer.
30 Long Play (LP) equalization switch; 15 Ω on resistance and 150 kΩ input impedance.
31 Linear audio recording amplifier negative feedback input for connecting a record
equalization network.
32 Digital output controlled by I2C-bit RN; can be used to drive an external (high voltage)
head switch and possibly the bias oscillator.
33 Linear audio recording amplifier output.
34 Linear audio playback amplifier input; during playback the impedance is 100 kΩ;
during record the impedance is 7 Ω.
35 Long Play equalization switch 50 Ω on and 150 kΩ off impedance to PBIN.
36 Linear audio playback amplifier DC decoupling.
1995 Mar 21
5
5 Page 
Philips Semiconductors
Audio processor for VHS hi-fi
and linear audio
Preliminary specification
TDA9614H
6.1.8 DECODER SELECT (DECODESEL)
The line 2 output is normally connected to a decoder box
or e.g. a second VCR (SCART2). Normally the audio
signal from the output select will be available at this output,
but three extra selections are shown in Table 3.
Table 3 Extra decoder select possibilities
SELECTION
DESCRIPTION
TUNER(1) audio from input TUNER
EXT1(2)
audio from input EXT1
EXT3
audio from input EXT3
Notes
1. Enables the use of a decoder box (connected to line 2
[EXT2]) by the VCR.
2. Decoder box connection to television set
(See Section 6.1.7).
6.1.9 HEADPHONE SELECT (HPSEL)
The headphone output will normally carry the output select
signal, however three more selections are possible and
shown in Table 4.
Table 4 Extra headphone select possibilities
SELECTION
DESCRIPTION
LEFT(1)
left hi-fi channel
RIGHT(1)
right hi-fi channel
NORMAL
linear audio, useful for monitoring the
recording by ‘audio dubbing’
Note
1. The selections LEFT and RIGHT make it possible to
select a different language for the headphone as for
the line outputs. A possible implementation is to invert
always a language selection made at the output select.
6.1.10 HEADPHONE VOLUME
The headphone volume control has a control range of
+16 dB to −47 dB in 1 dB steps and a full mute.
6.1.11 DC SELECT (DCSEL)
The VU meter output is normally connected to the
headphone select, but can also be switched to STEREO
(hi-fi stereo, before the output select). When using the
VU meter output signal to implement a ‘digital AGC’ (read
the level at the DC output, and adjust the VOLUME L/R
controls accordingly) it is necessary to have information of
both hi-fi audio channels, independent from the setting of
output or headphone select. For this mode the selection
STEREO can be made.
6.2 Linear audio circuits
6.2.1 RECORD/LOOP-THROUGH
The signal selected with the normal select can be level
controlled in the AGC block. If wanted this AGC can be
switched off using bit AGCN. The audio signal is thereafter
DC decoupled using a capacitor between pin 29 (LINOUT)
and pin 28 (LININ).
From here on the signal goes to the output select and (in
the event of record mode) to the record equalizer. The
record equalizer is a non-inverting amplifier with a gain of
+12 dB, consisting of an opamp with feedback resistors,
and acts as a pre-correction filter for the tape and head
characteristics. The inverting input of the opamp is
connected to pin 31 (RECEQ), its output to pin 33
(RECOUT). The circuit externally connected between
pin 31 and ground defines the transfer of the record
equalizer with equation: A = 3.98 × -(---1---2----0---Z0-----+-----Z----)-
Where: Z is the complex impedance of the external circuit.
Two equalizings can be used, switching additional circuitry
to ground with pin 30 (EQSW) in long play or extended
play (I2C-bus: LP = 1).
Instead of the hi-fi circuit, linear audio has two
loop-through modes:
• Loop-through playback
• Loop-through record.
The only difference between Loop-through record and
record is the RECOUT output, which is muted.
The LINREC output (pin 32) is used to drive the external
high-voltage switch and possibly the bias oscillator. The
LINREC voltage has a small internal delay to be
non-overlapping with the internal switching to playback
mode. This ensures that no bias voltage will appear at the
PBIN input while the IC is in playback mode.
6.2.2 PLAYBACK
The signal coming from the head is amplified and can be
level controlled in 16 steps of 1 dB. This setting can be
used to adjust for spread or nominal difference in head
output level. Afterwards, the signal is frequency corrected
in the playback equalizer. This equalizer includes the two
standard VHS equalizing settings of 3180 and 120 µs
1995 Mar 21
11
11 Page | ||
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