STV-6410-R01 datasheet(87/105 Pages) STMICROELECTRONICS

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CMOS Sensor; Customer Datasheet, Rev 3.0, 28 September 2000

VV5410 & VV6410

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11. Other Features

11.1 Audio Ampliﬁer

VV5410/VV6410 contains an on-chip audio amplifier which can be configured via the serial interface. The amplifier may also be

powered down via the serial interface.

The following document outlines the implementation of audio circuitry on the VV5410/VV6410 sensor.

11.1.1 Audio Ampliﬁer Conﬁguration

The audio circuit is controlled through a single eight bit register on the VV5410/VV6410. This includes bits for power down, output

select, first and second stage gains and current boosting. Table 59 describes the functionality of the control register bits.

The first stage provides a gain of 0dB or 30dB using a low noise amplifier design.

The reference is provided from the on-chip bandgap voltage. This is buffered by a cut down version of the low-noise amplifier

used in the first gain stage.

The output of the first gain stage is fed to two output amplifiers. These can be configured with a 1mA or 2mA output drive current.

The inverting gain stage provides an additional gain between 0dB and 18dB.

The output of the inverting gain stage may be routed through the other output buffer to provide two single ended outputs.

Otherwise, the inverted and non-inverted outputs provide a fully differential output signal.

Some more circuit specifications may be found in Table 60.

Bit

Function

Default

Comments

First stage gain

0 - 0dB

1 - 30dB

Second stage gain[1]

gain[1] gain[0] - gain(dB)

0 0 - 0dB

0 1 - 6dB

1 0 - 12dB

1 1 - 18dB

Second stage gain[0]

Power Down

0 - Powered up

1 - Power down

Output Select

0 - Single ended

1 - Differential

Current Boost

0 - 1mA output drive in output buffers

1 - 2mA output drive in output buffers

7:6

Unused

Table 59 : Control register summary for VV5410/VV6410 audio circuit.

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