CS3302A-IS 查看數據表（PDF） - Cirrus Logic

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CS3302A-IS

High-Z, Programmable Gain, Differential Amplifier

Cirrus Logic 

CS3302A

DS765PP1

CS3302A

2. GENERAL DESCRIPTION

The CS3302A is a high-impedance, low-noise

CMOS differential input, differential output ampli-

fier for precision analog signals between DC and

2 kHz. It has multiplexed inputs, rough/fine charge

outputs, and programmable gains of x1, x2, x4, x8,

x16, x32, and x64.

The performance of this amplifier makes it ideal

for low-frequency, high-dynamic-range applica-

tions requiring low distortion and minimal power

consumption. It is optimized for use in acquisition

systems designed around the CS5371A/72A sin-

gle/dual ∆Σ modulators and the CS5376A quad

digital filter or the CS5373A ∆Σ modulator and

CS5378 digital filter. Figure 3 shows the system-

level architecture of a 4-channel acquisition system

using four CS3302A, two CS5372A, one

CS4373A, and one CS5376A. Figure 4 shows the

system architecture of a single channel acquisition

system using a CS3302A, CS5373A, and CS5378.

2.1 Analog Signals

2.1.1 Analog Inputs

The amplifier analog inputs are designed for high-

impedance differential sensors. Input multiplexing

simplifies system connections by providing sepa-

rate inputs for a sensor and test DAC (INA, INB) as

well as an internal termination for noise tests. The

MUX0, MUX1 digital pins determine which multi-

plexed input is connected to the amplifier.

2.1.2 Analog Outputs

The amplifier analog outputs are separated into rough

charge / fine charge signals to easily connect to the

CS5371A/72A/73A inputs. Each differential output

Geophone

or

Hydrophone

Sensor

Geophone

or

Hydrophone

Sensor

Geophone

or

Hydrophone

Sensor

Geophone

or

Hydrophone

Sensor

10

CS3301A

CS3302A

M

U

AMP

X

CS5371A

CS5372A

∆Σ

CS3301A

Modulator

CS3302A

M

U

AMP

X

CS3301A

CS3302A

M

U

AMP

CS5371A

X

CS5372A

∆Σ

CS3301A

Modulator

CS3302A

M

U

AMP

X

Switch

SMwUitXch

MUX

CS5376A

Digital Filter

CS4373A

Test

DAC

Figure 3. System Architecture

System Telemetry

µController

or

Configuration

EEPROM

Communication

Interface

DS765PP1

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