STV-6410-R01 datasheet(89/105 Pages) STMICROELECTRONICS

89 / 105 page

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

VV5410 & VV6410

Commercial in confidence

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cd5410-6410f-3-0.fm

11.1.4 Audio Ampliﬁer Bandwidth1

The audio circuit can be bandwidth limited to a first order, through the use of minimum external circuitry. The two outputs, AoutP

and AoutN, require compensation capacitors that may also be used to define the bandwidth of the circuit.

In addition, the inclusion of a resistor (microphone biasing) and decoupling capacitor at the input allows a first order high pass

filter to be realised. This can easily be designed to remove frequencies below 50Hz/60Hz (mains electricity noise).

11.2 Voltage Regulators

VV5410/VV6410 contains three on-chip voltage regulators, two of which are capable of being powered-down via the serial

interface. The third regulator, controlling the band gap references is never powered down. The band gap circuitry is extremely low

power consuming only 30

µA.

11.2.1 Regulator for Digital System

The output of the regulator, Reg3V3, powers the digital logic and can power an external co-processor. The regulator is powered

up by default. The regulator has its own discrete power supply and can source a load of 300

µA -> 150mA and will regulate to

3.0V 10% from an input range of 4-6V. When VV5410/VV6410 is in the USB compatible suspend mode, the clocks to the digital

logic are removed to limit power consumption to approximately 80

µA. If an external 3.3V supply is available, this regulator may

be overdriven by an external 3.3V supply to directly power the logic. This voltage regulator is never powered down.

11.2.2 Regulator for Audio Ampliﬁer

The output of the regulator for the audio amplifier, Aud3V3, drives the load resistor for the microphone and the audio pre-

amplifier. As this regulator is capable of being powered-down via the serial interface, all control signals from the digital logic are

low during low power/standby. This regulator will be powered up by default.

11.2.3 Regulator for Video Supply/Analogue Core

The output of the regulator for the video supply,Vid3V3, powers the analog core. This regulator is capable of being powered-

down via the serial interface but will be powered up by default. Note that the sensor will be in low power mode initially and

therefore

11.3 Valid Supply Voltage Conﬁgurations

The power supplies to the VV5410 and VV6410 sensors can be configured such that the sensor will operate in a number of

systems:

•

USB system (sensor will regulate the nominal 5V supply to 3V3 internally) with optional BJT to provide power for a companion

chip.

•

Direct drive the sensor with 3V3 (internal voltage regulators will be powered down in this mode).

The next 2figures will detail the options described above:

Minimum dynamic range includes dcout (i.e. Vclip- OUT_DC is greater than Vppmin/2)

Assumes 10

µF bypass capacitors on all supplies and well separated supplies and grounds

1. Each audio output must have a capacitor (Ccomp) connected to ground to avoid any oscillation

Compensation Capacitor (nF)

3dB Bandwidth

Units

175

kHz

100

4.2

kHz

Table 62 : Compensation capacitor values

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