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CS3302 датащи(PDF) 10 Page - Cirrus Logic

номер детали CS3302
подробное описание детали  High-Z, Programmable Gain, Differential Amplifier
PDF  16 Pages
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производитель  CIRRUS [Cirrus Logic]
домашняя страница  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS3302 датащи(HTML) 10 Page - Cirrus Logic

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CS3302
10
DS596F3
2.
GENERAL DESCRIPTION
The CS3302 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 amplifier’s performance makes it ideal for
low-frequency, high-dynamic-range applications
requiring low distortion and minimal power con-
sumption. It’s optimized for use in acquisition sys-
tems designed around the CS5371/72 single/dual
∆Σ modulators and the CS5376A quad digital fil-
ter. Figure 3 shows the system-level architecture
of a 4-channel acquisition system using four
CS3302, two CS5372, one CS4373A, and one
CS5376A.
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 CS5371/72 inputs. Each output also includes
a series resistor, requiring only two differential ca-
pacitors to create the CS5371/72 input anti-alias
filter.
∆Σ
M odulator
∆Σ
M odulator
Digital Filter
AM P
AM P
AM P
AM P
Geophone
or
Hydrophone
Sensor
Geophone
or
Hydrophone
Sensor
Geophone
or
Hydrophone
Sensor
Geophone
or
Hydrophone
Sensor
M
U
X
M
U
X
M
U
X
M
U
X
Test
DAC
µController
or
Configuration
EEPROM
Comm unication
Interface
CS3301
CS3302
CS5371
CS5371
CS5376A
CS4373A
System Telemetry
CS3301
CS3302
CS3301
CS3302
CS3301
CS3302
CS5372
CS5372
Switch
MUX
Switch
MUX
Figure 3. System Architecture



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