Philips TDA9605H-N1 Datasheet

DATA SH EET

Product specification
File under Integrated Circuits, IC02

1999 Apr 14

INTEGRATED CIRCUITS

TDA9605H

Audio processor with head amplifier
for VHS hi-fi

1999 Apr 14 2

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

CONTENTS

1 FEATURES
2 GENERAL DESCRIPTION
3 ORDERING INFORMATION
4 BLOCK DIAGRAM
5 PINNING
6 FUNCTIONAL DESCRIPTION

6.1 Record-mute mode or head identification
selection

6.2 Hi-fi audio output level

6.3 Reference current

6.4 Head amplifier

6.4.1 Playback mode

6.4.2 Record-mute mode

6.4.3 Record mode

6.4.4 Head amplifier power supply and ground

6.5 Automatic calibration

6.6 Power muting

6.7 Envelope output

6.8 RF converter output

6.9 Audio dubbing

6.9.1 Output mix

6.9.2 Input mix

7I

2

C-BUS PROTOCOL

7.1 Addresses and data bytes

7.2 Valid transmissions to and from the TDA9605H

7.3 Overview of the TDA9605H I2C-bus control

7.4 Control byte at subaddress 00H

7.4.1 Audio FM mode

7.4.2 Playback mode

7.4.3 Record mode

7.4.4 System standard selection

7.4.5 Head amplifier playback amplification

7.4.6 Head amplifier record current

7.5 Select byte at subaddress 01H

7.5.1 Decoder output select

7.5.2 Head amplifier record current range select

7.5.3 Normal input level

7.6 Input byte at subaddress 02H

7.6.1 Input select

7.6.2 Normal select

7.7 Output byte at subaddress 03H

7.7.1 Line output amplification

7.7.2 Output select

7.7.3 Envelope output select

7.7.4 Line output select

7.7.5 Decoder output select

7.7.6 RF converter mute

7.8 Volume bytes at subaddresses 04H, 05H
and 06H

7.8.1 Left and right volume control

7.9 Power byte at subaddress 07H

7.9.1 Calibration start

7.9.2 DC output voltage selection

7.9.3 Test mode

7.9.4 Power-on reset

7.9.5 Head amplifier disable

7.9.6 Power muting

7.9.7 Standby select

7.10 Read byte

7.10.1 Calibration ready

7.10.2 Auto-normal selection

7.10.3 Calibration error

7.10.4 Power-on reset

8 LIMITING VALUES
9 THERMAL CHARACTERISTICS
10 GENERAL CHARACTERISTICS
11 RECORD-MUTE MODE CHARACTERISTICS
12 RECORD MODE CHARACTERISTICS
13 PLAYBACK MODE CHARACTERISTICS
14 APPLICATION AND TEST INFORMATION

14.1 RM and HID control signals

14.2 Reference current resistor

14.3 Setting line output level

14.4 Test modes

15 INTERNAL CIRCUITRY
16 PACKAGE OUTLINE
17 SOLDERING

17.1 Introduction to soldering surface mount
packages

17.2 Reflow soldering

17.3 Wave soldering

17.4 Manual soldering

17.5 Suitability of surface mount IC packages for
wave and reflow soldering methods

18 DEFINITIONS
19 LIFE SUPPORT APPLICATIONS
20 PURCHASE OF PHILIPS I2C COMPONENTS

1999 Apr 14 3

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

1 FEATURES

• All functions controlled via the serial 2-wire I2C-bus

• Integrated standby modes for low power consumption

• Audio FM head amplifier:

– Programmable recording current
– Programmable playback amplification
– Fast record-mute mode control input.

• Hi-fi signal processing:
– Adjustment free
– High performance
– Low distortion switching noise suppressor
– NTSC and PAL (SECAM) system.

• Linear audio input:
– Programmable (playback) level.

• 5 stereo inputs and additional mono Second Audio
Program (SAP) input

• 2 stereo outputs (line and decoder) with independent
output select function

• RF converter output with overload-protection AGC

• Integrated output power muting

• Audio level meter output

• Extensive input and output select function

• Full support of video recorder feature modes.

2 GENERAL DESCRIPTION

The TDA9605H is a single-chip device in a small package
that contains all the required functions, including the head
amplifier, to realize the audio FM hi-fi stereo system in a
VHS video recorder (see Fig.1). The device is adjustment
free by use of an integrated auto-calibration system.
Extensive signal select functions are offered to support
pay-TV decoding and video recorder feature modes.

The high performance and functionality of the TDA9605H
comprises world-wide system and application
requirements for NTSC, PAL, SECAM and multi-standard
video recorders from basic up to high-end models.

3 ORDERING INFORMATION

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA9605H QFP44 plastic quad flat package; 44 leads (lead length 1.3 mm);

body 10 × 10 × 1.75 mm

SOT307-2

1999 Apr 14 4

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

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4 BLOCK DIAGRAM

n

dbook, full pagewidth

MGR834

M

M

M

M

TUL

SAP

V

CCH

GNDH

PBIN1

PBIN2

RECOUT

HMSW

1

TUNL

2

TUNR

3

CINL

4

40
39

37

35

36

38

CINR

5

EXT1L

6

EXT1R

7

EXT2L

SAP
TUL
TUR

E1L
E1R
E2L
E2R

8

EXT2R

9

AUXL

10

AUXR

N
dub

11

normal select

input select

volume right

M

normal

input
level

RF converter

mute

volume left

decoder

select

+1 dB 12 V

TDA9605H

1.7 or 1.8 MHz

SAP

21 22

LINOUT LININ

TUR

DCL
DCR

HID

HID

SDA SCL

DCFBL

26
25

EMPHL

24

DCL

23

DETL

DCFBR

EMPHR

DCR

DETR

TUL
E1L
SAP

TUR
E1R

E2L

E2R

V

CC

SAP

+

+ ++

+

+

41 44 42 43

standby select

SUPPLY

V

CC

GND

V

refIref

34 27 29 28

playback. +

record-mute,

recording

M

+

E2L
E2R

+

HF LFP

L

DCR

R

N

dub

HF LIMITER

PEAK HOLD

LEVEL

DETECTOR

PLL

CCO

(1.7 or

1.8 MHz)

LEVEL

DETECTOR

DROPOUT

CANCELING

HI-FI

DETECTOR

1.3 or 1.4 MHz

HF LFP

HF AGC

M

carrier ratio select,

record-mute

playback head

amplification,

record head

current

HF LIMITER

PLL

CCO

(1.3 or

1.4 MHz)

envelope output

select + record

envelope

output
select

+ playback

DCL

MUTEL

MUTER

LINEL

DECR

DECL

LINER

RFCOUT
MUTEC

mute

R

L

PEAK HOLD

AUTO-MUTE

line select

output selectAUTN

AUTN

M

NOISE

SUPPRESSION

NOISE

SUPPRESSION

RECTIFIER

NOISE REDUCTION

FM (DE-)MODULATOR

HEAD AMPLIFIER

I/O CONTROL

CCA

W + FM

5th ORDER
AUDIO LPF

COMPRESSOR

EXPANDER

DETECTOR

AUDIO

CLIPPER

I2C-BUS

INTERFACE

M

= mute

I2C-bus
control

HID

RM

RMHID

ENVOUT

RM

19

20

16
15

17
18

13
14

AUDIO

CLIPPER

12

RFCAGC

30
31
32
33

RECTIFIER

CCA

W + FM

5th ORDER
AUDIO LPF

COMPRESSOR

EXPANDER

DETECTOR

Fig.1 Block diagram.

1999 Apr 14 5

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

5 PINNING

SYMBOL PIN DESCRIPTION

SAP 1 tuner input mono
TUNL 2 tuner input left
TUNR 3 tuner input right
CINL 4 CINCH input left
CINR 5 CINCH input right
EXT1L 6 external 1 input left
EXT1R 7 external 1 input right
EXT2L 8 external 2 input left
EXT2R 9 external 2 input right
AUXL 10 auxiliary input left
AUXR 11 auxiliary input right
RFCAGC 12 RF converter AGC timing connection
RFCOUT 13 RF converter output
MUTEC 14 mute for RF converter output
MUTEL 15 mute for line output left
LINEL 16 line output left
LINER 17 line output right
MUTER 18 mute for line output right
DECL 19 decoder output left
DECR 20 decoder output right
LINOUT 21 linear audio output
LININ 22 linear audio input
DCFBL 23 DC feedback noise reduction

connection left

EMPHL 24 emphasis noise reduction connection

left

DCL 25 DC decoupling noise reduction

connection left

DETL 26 detector noise reduction connection

left
GND 27 ground
I

ref

28 reference standard current connection

V

ref

29 reference voltage connection

DETR 30 detector noise reduction connection

right
DCR 31 DC decoupling noise reduction

connection right
EMPHR 32 emphasis noise reduction connection

right
DCFBR 33 DC feedback noise reduction

connection right
V

CC

34 power supply
PBIN2 35 head 2 playback input
RECOUT 36 recording current output
PBIN1 37 head 1 playback input
HMSW 38 head amplifier mode switch connection
GNDH 39 ground of head amplifier
V

CCH

40 power supply of head amplifier
RMHID 41 record-mute mode or head

identification input
SDA 42 I2C-bus data input/output
SCL 43 I

2

C-bus clock input

ENVOUT 44 HF or AF envelope output

SYMBOL PIN DESCRIPTION

1999 Apr 14 6

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

6 FUNCTIONAL DESCRIPTION

Input and output selections for the various modes are given in the following diagrams:

• Standard operating mode (see Fig.3)

• Dub-mix mode (see Fig.4)

• Standby mode: active or passive (see Fig.5).

Fig.2 Pin configuration.

handbook, full pagewidth

1
2
3
4
5
6
7
8

9
10
11

33
32
31
30

29
28
27
26
25
24
23

12

13

14

15

16

17

18

19

20

21

22

44

43

42

41

403938

37

36

35

34

TDA9605H

MGR835

DCFBR
EMPHR
DCR
DETR

I

ref

GND
DETL
DCL
EMPHL
DCFBL

SAP

TUNL

TUNR

CINL

CINR

EXT1L

EXT2L

EXT2R

AUXR

V

ref

SCL

SDA

RMHID

V

CCH

GNDH

HMSW

RECOUT

PBIN2

V

CC

ENVOUT

PBIN1

RFCOUT

MUTEC

MUTEL

LINEL

LINER

MUTER

DECR

LINOUT

LININ

RFCAGC

DECL

EXT1R

AUXL

1999 Apr 14 7

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

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MGR836

TUNL

TUNER

MUTE
(−47 to 0 dB;
0 to +15 dB)

MUTE

(0 to +14 dB)

AUDIO FM

PROCESSING

HI-FI

MUTE
(−47 to 0 dB;
0 to +15 dB)

CINCH

EXT1

EXT2
SAP

(1)

AUX

INPUT SELECT
INPUT LEFT
VOLUME
VOLUME LEFT
SAP

LINOUT

linear audio

processing

LININ

TUNER
EXT2
MUTE

DUB MIX

MUTE
LEFT

EXT2
OUTPUT SELECT

OUTPUT SELECT

ENVOUT

RFCOUT

HF ENVELOPEHF envelope

STEREO

RIGHT
STEREO
NORMAL

TUNER
EXT1
SAP
MUTE
OUTPUT SELECT

NORMAL

TUNR

CINL

CINR

EXT1L

EXT1R

EXT2R

AUXL

SAP

EXT2L

AUXR

volume left

volume right

output select

line select

input select

NORMAL LEFT
NORMAL RIGHT
NORMAL STEREO

decoder select

0 dB AGC

0 dB

+1 dB

MUTE

RF converter AGC

envelope select

normal input levelnormal select

DECL

line output

amplification

DECR

LINEL

LINER

RECOUT

tape

PBIN1
PBIN2

Fig.3 Input and output selections for standard operating mode.

(1) For dub-mix mode signal selections see Fig.4.

1999 Apr 14 8

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

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MGR837

TUNL

MUTE
(−47 to 0 dB;
0 to +15 dB)

MUTE

(0 to +14 dB)

AUDIO FM

PROCESSING

HI-FI

MUTE
(−47 to 0 dB;
0 to +15 dB)

INPUT SELECT
INPUT LEFT

VOLUME

VOLUME LEFT
SAP

LINOUT

linear audio
processing

(record)

LININ

TUNER
EXT2
MUTE

DUB MIX

MUTE
LEFT

EXT2

OUTPUT SELECT

OUTPUT SELECT

ENVOUT

RFCOUT

HF ENVELOPEHF envelope

STEREO

RIGHT
STEREO
NORMAL

TUNER
EXT1
SAP
MUTE
OUTPUT SELECT

TUNR

CINL

CINR

EXT1L

EXT1R

EXT2R

AUXL

SAP

EXT2L

AUXR

RECOUT

tape

volume aux output select

line select

input select

PBIN1
PBIN2

NORMAL
NORMAL
NORMAL

MUTE
LEFT
RIGHT

MUTE

LEFT
RIGHT

LEFT RIGHT

LEFT RIGHT

decoder select

0 dB AGC

0 dB

+1 dB

MUTE

RF converter AGC

envelope select

normal input levelnormal select

DECL

line output

amplification

DECR

LINEL

LINER

volume hi-fi

(playback)

Fig.4 Input and output selections for dub-mix mode.

Dub-mix mode: IS2 = 1, IS1 = 0 and IS0 = 1.
Input mixing of the hi-fi (playback) signal with the auxiliary, used for linear audio dubbing recording.
Selections generally used in combination with dub-mix mode are shown in heavy line type.

1999 Apr 14 9

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

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MGR838

TUNL

MUTE

EXT2
OUTPUT SELECT

RFCOUT

TUNER
EXT1
SAP
MUTE
OUTPUT SELECT

TUNR

CINL

CINR

EXT1L
EXT1R

EXT2R

AUXL

SAP

EXT2L

AUXR

line select

input select

MUTE

output select

TUNL

MUTE

TUNR

CINL

CINR

EXT1L
EXT1R

EXT2R

AUXL

SAP

EXT2L

AUXR

input select

decoder select

0 dB

+1 dB

MUTE

RF converter AGC

DECL

line output

amplification

DECR

LINEL

LINER

Fig.5 Input and output selections for standby modes.

b. Passive standby mode (bit STBP = 1); over 90% power reduction.

a. Active standby mode (bit STBA = 1, bit STBP = 0); over 80% power reduction.

1999 Apr 14 10

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

6.1 Record-mute mode or head identification
selection

Pin RMHID allows input of two independent digital control
signals for selecting the record-mute or head identification
modes which are voltage coded. The RM control signal is
selected via a 10 kΩ resistor and the HID control signal is
selected via a 18 kΩ resistor. This set-up enables the two
signals within the TDA9605H to be separated. The RM
control signal is only in use during the record mode
(bit AFM = 1); during the playback mode (bit AFM = 0) the
RM signal is ignored. Pin RMHID should be connected to
ground when the RM control signal is not used.

The use of the RM control signal is optional since the same
function is available via the I

2

C-bus control in the
record-mute mode. However, accurate timing of recording
start and stop may sometimes be difficult to realize via the
I2C-bus control. In this event the RM control signal can be
used instead. There is also the possibility to use the
record-mute mode control line of the video head amplifier.

6.2 Hi-fi audio output level

When the application circuit is used in accordance with the
application diagram, the standard FM deviation of 50 kHz
equals a 1 kHz audio signal of −8 dBV line output level
(bit LOH = 0). A different standard audio level can be
selected by changing the external filter components of the
noise reduction on pins EMPHL and EMPHR
(see Section 14.3). The standard audio level changes
proportionally to the impedance of the external
de-emphasis filter.

6.3 Reference current

The external resistor connected to pin I

ref

defines the
internal reference currents and determines the
temperature stability of circuits adjusted by the
auto-calibration function.

6.4 Head amplifier

6.4.1 PLAYBACK MODE
The playback mode is selected by setting bit AFM = 0.

During the playback mode the input circuit on pins PBIN2
and PBIN1 is enabled (see Fig.6). Pin RECOUT is
disabled and pin HMSW shows a low impedance to
ground, so realizing an AC ground for the head circuit via
the external capacitor connected between these pins.

The head identification (HID) signal on pin RMHID selects
between the head signals on pins PBIN2 or PBIN1. Head
selection is defined as shown in Table 1.

The state of the RM control signal on pin RMHID is don’t
care in the playback mode.

I

2

C-bus control bits HAC2, HAC1 and HAC0 offer a wide
selection of playback amplification to fit different head and
head transformer specifications. The advised setting of the
playback amplification realizes a level of 24 mV (RMS) for
each carrier signal after the head amplifier to obtain a
17 dB overhead compared to the auto-normal level (hi-fi
detection). However, performance is not critical and a
different setting can be used if desired.

The carrier level can be measured using the HF envelope
output voltage on pin ENVOUT (bit EOS = 1). During
standard operating mode the HF envelope signal is
derived from the left channel carrier amplitude
(1.3 or 1.4 MHz carrier) but the special test 10 of the test
mode also enables the HF envelope output of the right
channel carrier amplitude (1.7 or 1.8 MHz carrier).
The advised carrier playback level of 24 mV (RMS) equals
an HF envelope voltage of 3.3 V.

The head amplifier output signal can be monitored directly
by using test 8 of the test mode. Pin ENVOUT functions as
the test output showing 6 dB attenuation compared to the
actual head amplifier output level (see Section 14.4).

Table 1 Selection of the head signal

6.4.2 R

ECORD-MUTE MODE

The record-mute mode is selected by setting bit AFM = 1
and either setting bits DOC, SHH and DETH to logic 0 or
switching the RM control signal to HIGH-level.

During the record-mute mode no recording current is
present on pin RECOUT (see Fig.6). The head amplifier
status actually equals the playback mode, however, the
second amplifier stage is disabled to minimize power
consumption.

The RM control signal on pin RMHID enables fast
switching between the record and record-mute modes
(see Table 2). If the I2C-bus control is set to the record
mode, the use of record-mute mode control via pin RM
allows for accurate timing of recording start and stop,
independent of the I2C-bus control (see Section 6.1).

HID

SIGNAL

LEVEL ON PIN RMHID

SELECTION OF

HEAD SIGNAL

LOW lower than 0.6 V or

between 2.65 and 3.8 V

pin PBIN2
(head 2)

HIGH between 1.0 and 2.35 V

or higher than 4.3 V

pin PBIN1
(head 1)

1999 Apr 14 11

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

Table 2 Selection of recording modes

6.4.3 R

ECORD MODE

The record mode is selected by setting bit AFM = 1 and
setting bits DOC, SHH and DETH from logic 001 to 111
and switching the RM control signal to LOW-level.

During the record mode actual recording is activated and
the recording current is output on pin RECOUT
(see Fig.6). Pins PBIN2 and PBIN1 form a connection to
the 5 V head amplifier supply voltage (V

CCH

). Pin HMSW
is internally connected to pin RECOUT and the external
capacitor has no function in this mode.

The desired carrier mix ratio is set via I2C-bus control
bits DOC, SHH and DETH. A wide selection of recording
currents is available to fit different head and head
transformer specifications and are set via bits HAC2,
HAC1, HAC0 and range bit HRL. The setting of the carrier
mix ratio does not change the selected recording current.

RM

SIGNAL

LEVEL ON

PIN RMHID

RECORD MODE

LOW lower than 2.35 V record or record-mute

mode as defined by
I

2

C-bus control

HIGH higher than 2.65 V record-mute mode

The DC bias current on pin RECOUT is changed
proportional to the selected recording current for
optimizing the performance and minimizing the power
consumption for each recording current selected.

A Boucherot damping circuit is connected between
pin HMSW and ground to prevent head current resonance
peaking. A capacitor of 10 nF and a resistor of 470 Ω are
specified in Fig.14, but the component values are not
critical.

6.4.4 H

EAD AMPLIFIER POWER SUPPLY AND GROUND

The head amplifier is supplied via a separate 5 V supply
(pin V

CCH

) and ground (pin GNDH).

A capacitor of 100 nF should be placed close to the device
between pins V

CCH

and GNDH for proper decoupling of

the power supply.
The head amplifier ground (pin GNDH) should be

connected to the main ground (pin GND).

Fig.6 Simplified circuit diagrams of the head amplifier modes.

handbook, full pagewidth

MGR841

35 kΩ

GNDH

GNDH

AH2

PBIN2

PBIN1

HMSW

RECOUT

AH1

35 kΩ

GNDH

TDA9605H

38

37

36

35

PBIN2

PBIN1

HMSW

RECOUT

38

37

36

35

5 Ω

GNDH

AH2

AH1

V

CCH

V

CCH

TDA9605H

a. Playback mode and record-mute mode. b. Record mode.

1999 Apr 14 12

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

6.5 Automatic calibration

The integrated auto-calibration system is activated by
means of bit CALS of the power byte (see Fig.7).
The auto-calibration system ensures hi-fi processing is
well in accordance with the VHS hi-fi system standard by
an automated adjustment of carrier frequencies,
band-pass filters and noise reduction filters. Calibration is
only needed after start-up of the video recorder.
The calibration settings remain stable as long as the
supply voltage (VCC) is present.

Auto-calibration is only executed in the record-mute mode
or record mode and no standby mode or test mode should
be selected, i.e. auto-calibration requires the setting of
bit AFM = 1, bit STBP = 0, bit STBA = 0 and bit TEST = 0.
Auto-calibration is started after setting bit CALS = 1.
Calibration is performed fully automatically, using the HID
control signal as a time reference. Audio signals are not
disturbed during the calibration process.

Calibration of the oscillator frequencies is performed by
measuring the number of oscillator cycles within one
period when the HID control signal is at HIGH-level and
comparing this result with an internal value stored in the
Read Only Memory (ROM). Four different ROM values are
available for NTSC or PAL (SECAM) system calibration of
both the left and right channel carrier.

In case of NTSC a special routine is active for the
calibration of the right channel carrier which results in a

frequency difference between the left and right channel
carrier near to 401.2 kHz. This value effectively reduces
the crosstalk from hi-fi carriers to video colour signal as
present during Extended Play (EP) tape speed. NTSC
calibration uses a standard HID control signal of 29.97 Hz
(pulse width =16.683 ms) where PAL calibration uses a
standard HID control signal of 25 Hz (pulse
width = 20 ms). After auto-calibration the maximum
frequency error is ±5 kHz assuming a time error of
maximum of 5 µs when the HID control signal is at
HIGH-level. Jitter on the HID control signal should not
exceed 1 µs to realize EP optimization within ±2 kHz for
NTSC. In general, the crystal based HID control signal
available in the video recorder can be used without
modification.

When the calibration of the oscillators is completed the
band-pass filters are calibrated. The integrated weighting
and FM de-emphasis filters of the noise reduction are
calibrated at the same time.

The total auto-calibration time needed is maximum
17 cycles of the HID control signal. Completion of the
calibration is signalled by bit CALR =1 of the read byte.

The calibration can also be monitored by means of the
envelope output. For this purpose the voltage on
pin ENVOUT is forced to >2.5 V during the calibration.
The audio signal to the audio envelope function (level
meter) should be muted (i.e. output select = mute).

Fig.7 Example of automatic calibration flow.

handbook, full pagewidth

MGR842

logic 1

logic 0

logic 1

logic 0

4 V3 V

5 V

calibration
ready

I

2

C-bus write bit CALS

I

2

C-bus read bit CALR

ENVOUT output

RMHD input

left channel oscillator
right channel oscillator
band-pass and

noise reduction filters

1999 Apr 14 13

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

Otherwise, the audio envelope output voltage may
become >2.5 V which makes it impossible to detect the
completion of the calibration on pin ENVOUT.

Calibration relies upon the frequency accuracy of the HID
control signal. The calibration result may be incorrect
when the HID control signal is disturbed during a critical
part of the calibration. An additional check is incorporated
to detect such a situation by reading bit CALE during
calibration. When bit CALE = 1, the calibration result is
detected to be unreliable due to external causes. A new
auto-calibration can be started by setting bit CALS = 0
followed by setting bit CALS = 1. Bit CALE always reads
logic 1 when bit CALS is logic 0.

The oscillators and band-pass filters can be switched
between NTSC and PAL system frequencies after a
calibration in NTSC or PAL mode without the need of
additional calibration. Switching between these system
modes is executed immediately and can be done in any
operating mode. The frequency accuracy of system
switching is 100 ±3 kHz for both carriers. To obtain the
best possible frequency accuracy in the record mode it is
good practice to recalibrate after system switching.

6.6 Power muting

Switching off and on of the power supply voltage or using
the built-in passive standby mode results in rising and
dropping of the output DC voltages and causes strong
disturbances on the output pins. The TDA9605H includes
three integrated mute switches to block such disturbances
so avoiding the need for an external mute circuit. Pop-free
line and RF converter output signals are realized by
connecting the integrated power mute switches behind the
line and RFC output capacitors.

Power muting is active when bit MUTE = 1 (see Fig.8).
Power muting is automatically activated when V

CC

is
switched on, because this situation is the Power-on reset
default state. The integrated mute switches on
pins MUTEC, MUTEL and MUTER are closed and form a
low-impedance path to ground. Furthermore, the
pins RFCOUT, LINEL and LINER are current limited to

−1 mA to avoid excessive supply currents and to achieve
good noise attenuation without the need for a series
resistor between the output and mute pins. Pins DECL and
DECR are also current limited for using the integrated
power mute switches or for assisting external muting.

Fig.8 Examples of power mute control and the auto-mute function.

handbook, full pagewidth

MGR843

V

CC

auto-mute

(V

CC

< 7 V)

bit MUTE (I

2

C-bus)

(

1)

(

1)

bit STBP (I

2

C-bus)

MUTEC
MUTEL
MUTER

RFCOUT
LINEL
LINER

output signal
with power mute

t

mute

t

mute

t

mute

t

mute

t

mute

auto-mute

active

operation

power

off

power

off

active

operation

power off
(standby)

active

operation

passive
standby

(1) Power-on reset.

1999 Apr 14 14

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

During power muting the internal output signal is also
muted. After the output DC voltage has been established
power muting can be de-activated by setting bit MUTE = 0.
Now the mute switches are opened resulting in a
high-impedance path of 100 kΩ to ground. The output
current limiting is not active.

Power muting is also used in combination with the
integrated passive standby mode (bit STBP = 1). During
this mode the output circuits are switched off and the line,
decoder and RF converter output voltages decrease to 0 V
using a discharge current of 1 mA. Do not set power mute
mode and change the passive standby mode at the same
time. Power mute mode should be activated first, followed
by switching on or off of the passive standby mode to avoid
possible output glitches.

It should be noted that the time needed for stabilizing the
output DC voltage is proportional to the output capacitor
value. A safe mute time is 200 ms using a 10 µF capacitor
(t

mute

=C×20000 s). Power muting consumes
approximately 4 mA additional supply current, so to obtain
minimum power consumption the mute mode should be
de-activated after use. Very good performance is achieved
for power-up, power-down and passive standby mode
switching.

An auto-mute function is included which activates power
muting when the supply voltage drops below 7 V.
The performance of this auto-mute function depends upon
the power voltage drop rate. The voltage drop rate should
not exceed 1 V during 10 ms. The best performance
independent of voltage drop rate is realized by activating
the passive standby mode before switching off the power
supply voltage (by setting bit MUTE = 1 and bit STBP = 1).

6.7 Envelope output

Pin ENVOUT is an analog output for stereo audio level
(e.g. level meter display) and for playback FM carrier level
(e.g. auto-tracking). The functional diagram is given in
Fig.9 and the timing diagram is shown in Fig.10. Only one
ADC input is needed on the microcontroller for reading all
the required information.

During the playback mode the selection between audio
level and carrier level information is realized by setting
I

2

C-bus control bit EOS (see Table 3). The AF envelope
output is defined by the signal selection made at the output
select.

During the record mode bit EOS offers the selection
between the audio level of the output select or the audio
level of the fixed hi-fi stereo signal. This is a helpful setting
when the microcontroller uses the audio level information
to adjust the hi-fi recording level (volume control).

The HF envelope output signal is continuous and is
derived from the left channel carrier. The HF envelope
output exhibits a logarithmic characteristic (see Fig.11).

In a standard application circuit only the left channel carrier
level is required to support auto-tracking or manual
tracking. However, test 10 of the special test mode allows
for the right channel carrier level output instead for
measurement purposes (see Section 14.4).

The AF envelope output as a function of the output level is
given in Fig.12.

The AF envelope circuit uses time multiplexing for the left
and right channel audio level. A peak-hold function and
dynamic range compression (square root function) are
included for easy read out. The peak-hold function and the
left and right channel multiplexing are controlled by the
HID control signal on pin RMHID (see Table 4).

Table 3 Selection of the envelope output

Table 4 AF envelope output with channel multiplexing

MODE BIT AFM BIT EOS ENVELOPE OUTPUT FUNCTION

Playback

0

0 AF envelope: via output select level meter display
1 HF envelope auto-tracking or manual tracking display

Record

1

0 AF envelope: via output select level meter display
1 AF envelope: hi-fi stereo record volume control (and level display)

HID SIGNAL LEVEL ON PIN RMHID AF ENVELOPE OUTPUT

LOW lower than 0.6 V or between 2.65 and 3.8 V left channel audio peak level
HIGH between 1.0 and 2.35 V or higher than 4.3 V right channel audio peak level

1999 Apr 14 15

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

Fig.9 Functional diagram of the envelope output circuit.

handbook, full pagewidth

MGR845

output select
hi-fi

output select

left channel audio:

right channel audio:

hi-fi

EOS • AFM

AF

envelope

FULL-WAVE

RECTIFIER

FULL-WAVE

RECTIFIER

PEAK HOLD

PEAK HOLD

1.3 or 1.4 MHz carrier

RESET

RESET

EOS • AFM

test

10

HF

envelope

SAMPLE-

AND-HOLD

RMHID

RM
HID

ENVOUT

SAMPLE-

AND-HOLD

SAMPLE

SAMPLE

HF LEVEL DETECTOR

1.7 or 1.8 MHz carrier

HF LEVEL DETECTOR

SQUARE ROOT
COMPRESSION

SQUARE ROOT

COMPRESSION

t

d

Fig.10 Timing diagram of the envelope output signal.

handbook, full pagewidth

MGR844

I2C-bus

registers

HID signal

HID period

ENVOUT

level meter

display

EOS = 0 or AFM = 1

EOS = 1 and
AFM = 0

0123

HF envelope

peak right

in period −1

peak right

in period 0

peak right

in period +1

peak right

in period +2

peak left

in period 0

left (period 0)

right (period 0)

tracking level

indication

peak left

in period 1

peak left

in period 2

peak left

in period +3

left (period 1)

right (period 1)

left (period 2)

right (period 2)

1999 Apr 14 16

Philips Semiconductors Product specification

Audio processor with head amplifier for VHS hi-fi TDA9605H

Fig.11 HF envelope output (playback carrier level).

1.3 MHz (NTSC) or 1.4 MHz (PAL) at internal node between head
amplifier and HF AGC.

handbook, halfpage

0

5

1

2

3

4

MGR846

10

−1

11010

2103

ENVOUT

output

voltage

(V)

left channel carrier amplitude (RMS value) (mV)

Fig.12 AF envelope output (audio peak level).

Bit LOH = 0.

handbook, halfpage

5

0

1

MGR847

2

3

4

−40 10−30 −20 −10 0

ENVOUT

output

voltage

(V)

LINEL and LINER output level (dBV)

Fig.13 AGC output of RF converter.

handbook, halfpage

MGR848

RF

converter

output

(dBV)

−3

−3

line output (dBV)

6.8 RF converter output

An AGC function is incorporated to avoid overmodulation
in the RF converter connected to pin RFCOUT. The AGC
limits the maximum signal level on the RF converter output
to −3 dBV (see Fig.13).

The RF converter output can be muted by setting
bit RFCM = 1. When using this RF converter mute, the
AGC control is reset by discharging the capacitor
connected to pin RFACG.