Chip Information

TRANSISTOR COUNT: 12,875

PROCESS: BiCMOS

Dual, Audio, Log Taper Digital Potentiometers

10

______________________________________________________________________________________

MAX5408–

MAX5411

MAX5408–

MAX5411

MAX5408–

MAX541

SDIN

SCLK

CS

DOUT

SDIN

SCLK

CS

DOUT

SDIN

SCLK

CS

DOUT

CS

SCLK

SDIN

MAX5408–

MAX5411

W0A

W1A

L0

L1

H0

H1

Figure 6. Gain Control

Figure 5. Daisy-Chaining of Serial Interfaces

Ordering Information (continued)

PART

TEMP RANGE

PIN-

PACKAGE

WIPERS PER

RESISTOR

MAX5409ETE

-40

°C to +85°C 16 Thin QFN

2

MAX5410EEE -40

°C to +85°C 16 QSOP

1

MAX5410ETE

-40

°C to +85°C 16 Thin QFN

1

MAX5411EEE -40

°C to +85°C 16 QSOP

2

MAX5411ETE

-40

°C to +85°C 16 Thin QFN

2

Power-On Reset

The power-on reset (POR) feature sets all the wipers to

the maximum attenuation (tap position 31, -62dB) at

on reset intiates when one of the supplies is brought

back to the operating voltage.

Mute Function

When mute is enabled, the wipers go to -90dB attenua-

tion. When mute is disabled, the wiper returns to its

position before mute was enabled. All wipers can be

muted simultaneously or independently.

Applications Information

Attenuation Control

Figure 3 shows the application of an attenuation control.

The op amps are connected in a follower configuration

with a fixed gain. The digitally controlled potentiometer

attenuates the input signal.

Stereo Volume Control

Figure 4 shows the application of stereo volume con-

trol using MAX5409/MAX5411. The op amps are con-

nected in a follower configuration with fixed gain. The

digitally controlled potentiometer attenuates the input

signals. The second wiper of each potentiometer con-

trols the signal amplitude at the rear set of speakers.

Daisy-Chaining

Figure 5 shows an application daisy-chaining the

serial-interfaces of the MAX5408–MAX5411. A single-

write command updates multiple devices from a single

digital port in this configuration (see Digital Serial

Interface section).

Gain Control

Figure 6 shows the application of a gain control.

Note: Muting the potentiometer creates unpredictable

behavior at the output of the op amp, and may seriously

degrade the performance of the op amp.