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TDA9605H/N1

Audio processor with head amplifier for VHS hi-fi

Philips Electronics 

Philips Semiconductors

Audio processor with head amplifier for VHS hi-fi

Product specification

TDA9605H

Table 2 Selection of recording modes

RM

SIGNAL

LEVEL ON

PIN RMHID

RECORD MODE

LOW

lower than 2.35 V record or record-mute

mode as defined by

I2C-bus control

HIGH

higher than 2.65 V record-mute mode

6.4.3 RECORD 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 (VCCH). 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.

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 HEAD AMPLIFIER POWER SUPPLY AND GROUND

The head amplifier is supplied via a separate 5 V supply

(pin VCCH) and ground (pin GNDH).

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

between pins VCCH and GNDH for proper decoupling of

the power supply.

The head amplifier ground (pin GNDH) should be

connected to the main ground (pin GND).

handbook, full pagewidth

AH2

AH1

PBIN2 35

35 kΩ

RECOUT 36

GNDH

PBIN1 37

35 kΩ

HMSW 38

GNDH

GNDH

TDA9605H

AH2

AH1

VCCH

PBIN2 35

RECOUT 36

VCCH

PBIN1 37

HMSW 38

5Ω

GNDH

TDA9605H

MGR841

a. Playback mode and record-mute mode.

b. Record mode.

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

1999 Apr 14

11

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