SSM2005 datasheet(8/15 Pages) AD

8 / 15 page

SSM2005

–8–

REV. 0

Power-Up

The SSM2005 will be in an undefined mode on power-up. Reset

should be applied to the SSM2005, or the mode control logic

should be loaded to put the device into a definite mode state.

Serial Data Control Inputs

The SSM2005 provides a simple 3- or 4-wire serial interface to

control the mode settings for the device. Data is input on the

DATA IN pin, while CLOCK IN is the serial clock. Data can be

shifted into the SSM2005 at clock rates up to 1 MHz.

STEREO

INPUTS

PRECISION

SUM AND

DIFFERENCE

AMPLIFIERS

CIRCLE

SURROUND

OUTPUTS

L+R = CENTER

L–R = SURROUND

LEFT

RESET

CLOCK

SELECT

LOAD

SERIAL BUS

GND

VACOM

INPUT POWER

NOISE

GENERATOR

RIGHT

CENTER

SURROUND

HIGH BAND

SURROUND

LOW BAND

CROSSOVER

NETWORK

STEERING CONTROL GENERATOR

MODE CONTROL LOGIC

DATA

AUTO BALANCE

AND MUTE

TO SUBWOOFER

FILTER

CENTER CHANNEL

CANCEL

CHANNEL

STEERING

VCAs

OUTPUT

AMPLIFIERS

Figure 6. Block Diagram

The shift register clock at CLOCK IN is enabled when the

WRITE input is low. The WRITE pin can therefore be used as a

chip select input. However, the shift register contents are not

transferred into the register banks until the rising edge of

LOAD.

For a traditional 3-wire serial interface,

WRITE and LOAD

should be tied together. Figure 7 shows the timing diagram and

minimum timing requirements for the digital interface.

To enable a data transfer, the

WRITE and LOAD inputs are

driven low. The 8-bit serial data, formatted MSB first, should

be fed to DATA IN and clocked into the shift register on the

rising edge of CLOCK IN. The new mode setting will then

activate on the rising edge of

WRITE and LOAD.

Table II. Modes List

Modes

Effect

Video

Center Channel Cancellation Active

Music

Center Cancel Cancellation Off; Center Reduced by –4 dB.

5-2-5

5-Channel Circle Surround Enabled

4-2-4

4-Channel Matrix Enabled

Center On

Center Channel Output On

Phantom Center

Center Channel Output Off; Divided and Added to LF and RF

Sound Spread On

Hard Panned Input Steered to Front and Rear Side

Sound Spread Off

Hard Panned Input Steered to Front Side Only

Autobalance On

Balances L and R to

±1 dB

Autobalance Off

Autobalance Disabled

Noise Off

Noise Generator Disabled

Noise On

Noise Generator On; Inputs Muted

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