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TDA1566

I²C-bus controlled dual channel 46 W/2Ω, single channel 92 W/1Ωamplifier with load diagnostic features

NXP Semiconductors. 

NXP Semiconductors

TDA1566

I2C-bus controlled dual channel/single channel amplifier

I2C-bus mode

off

0 V 1.0 V

operation mode defined by IB1[D0] and IB2[D0]

2.6 V

VP

non-I2C-bus mode

off

0 V 1.0 V

mute

2.6 V

4.5 V

6.5 V

operating

VP

001aad 008

Fig 5. Enable pin mode switching in I2C-bus and non-I2C-bus mode

6.1.2 Gain selection

The TDA1566 features a 16 dB and a 26 dB gain setting. The 16 dB setting is referred to

as line driver mode, the 26 dB setting is referred to as amplifier mode. Table 6 shows how

the gain is selected.

Table 6. Gain select in I2C-bus and non-I2C-bus mode

Gain select

16 dB

I2C-bus

IB3[D6] = 1

IB3[D5] = 1

Non-I2C-bus

PROG connected with 1.5 kΩ

to GND

26 dB

IB3[D6] = 0[1]

IB3[D5] = 0[2]

PROG open[3]

[1] Channel 1.

[2] Channel 2.

[3] Both channels.

6.1.2.1 I2C-bus mode

The gain is selected with IB3[D6] for channel 1 and IB3[D5] for channel 2. If the gain

select is performed when the amplifier is muted, the gain select will be pop free. See

Section 6.4.2 for the definition of the instruction bytes.

If DC load detection is used, IB1[D1] = 1, auto gain select is activated. Detection of an

open load (see Section 6.2.1) will result in a line driver mode setting. If the load detection

data is invalid, IB3[D5] and IB3[D6] will define the gain setting.

6.1.2.2 Non-I2C-bus mode

The gain for channel 1 and channel 2 is selected with the PROG pin. Leaving the pin

unconnected selects 26 dB gain and connecting a resistor of 1500 Ω between the PROG

pin and GND selects 16 dB gain.

When the amplifier is used in line driver mode loads of 2 Ω and 4 Ω can be driven. With a

load larger than 25 Ω a Zobel network of 33 nF in series with 22 Ω should be connected

between the amplifier output terminals. The Zobel network should be placed close to the

output pins. To prevent instability in 1 Ω mode the amplifier must not be used in line driver

mode with a load larger than 25 Ω.

TDA1566_2

Product data sheet

Rev. 02 — 20 August 2007

© NXP B.V. 2007. All rights reserved.

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