SSM2160/SSM2161

–5–

REV. 0

PIN DESCRIPTIONS

Pin No.

Pin No.

Name

Function

1

1

V+

V+ is the positive power supply pin. Refer to the Power Supply Connections section for more

information.

2

2

AGND

AGND is the internal ground reference for the audio circuitry. When operating the SSM2160

from dual supplies, AGND should be connected to ground. When operating from a single

may also be connected to an external reference. Refer to the Power Supply Connections section

for more details.

33

divider between V+ and V–. In a dual-supply application with the AGND pin connected to

AGND. Refer to the Power Supply Connections section for more details.

4

4

CH1 OUT

Audio Output from Channel 1.

5

5

CH1 IN

Audio Input to Channel 1.

6

6

CH3 OUT

Audio Output from Channel 3.

7

7

CH3 IN

Audio Input to Channel 3.

8

–

CH5 OUT

Audio Output from Channel 5.

9

–

CH5 IN

Audio Input to Channel 5.

10

8

WRITE

A logic LOW voltage enables the SSM2160 to receive information at the DATA input (Pin 15).

A logic HIGH applied to WRITE retains data at their previous settings. See Timing Diagrams.

Serves as CHIP SELECT.

11

9

LD

Loads the information retained by WRITE into the SSM2160 at logic LOW. See Timing

Diagrams.

12

10

V–

V– is the negative power supply pin. Connect to ground if using in a single supply application.

Refer to the Power Supply Connections section for more details.

13

11

DGND

DGND is the digital ground reference for the SSM2160. This pin should always be connected to

ground. All digital inputs, including WRITE, LD, CLK, and DATA are TTL input compatible;

drive currents are returned to DGND.

14

12

CLK

CLK is the clock input. It is positive edge triggered. See Timing Diagrams.

15

13

DATA

Channel and Master control information flows MSB first into the DATA pin. Refer to Address/

Data Decoding Truth Table, Figure 19, for information on how to control the VCAs.

16

–

CH6 IN

Audio Input to Channel 6.

17

–

CH6 OUT

Audio Output from Channel 6.

18

14

CH4 IN

Audio Input to Channel 4.

19

15

CH4 OUT

Audio Output from Channel 4.

20

16

CH2 IN

Audio Input to Channel 2.

21

17

CH2 OUT

Audio Output from Channel 2.

22

18

MSTR SET

MSTR SET is connected to the inverting input of an I-V converting op amp used to generate a

Master Control voltage from the Master Control DAC current output. A resistor connected

from MSTR OUT to MSTR SET reduces the step size of the Master control. See the Adjusting

Step Sizes section for more details. A 10

µF capacitor should be connected from MSTR OUT to

MSTR SET to eliminate the zipper noise in the Master control.

23

19

MSTR OUT

MSTR OUT is connected to the output of the I-V converting op amp. See MSTR SET

description.

24

20

CH SET

The step size of the Channel Control can be increased by connecting a resistor from CH SET to

V+. No connection to CH SET is required if the default value of 1 dB per step is desired. Mini-

mum of 10

Ω external resistor. See the Adjusting Step Sizes section for more details.