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PDF CS3302A Data sheet ( Hoja de datos )
| Número de pieza | CS3302A | |
| Descripción | Differential Amplifier | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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CS3302A
High-Z, Programmable Gain, Differential Amplifier
Features & Description
z Signal Bandwidth: DC to 2 kHz
z Selectable Gain: x1, x2, x4, x8, x16, x32, x64
z Differential Inputs, Differential Outputs
• Multiplexed inputs: INA, INB, 800Ω termination
• Rough / fine charge outputs for CS5371A / 72A / 73A
• Max signal amplitude: 5 Vpp differential
• Ultra-low input bias: < 1 pA
z Excellent Noise Performance
• 1 µVp-p between 0.1 Hz and 10 Hz
• 8.5 nV/ √Hz from 200 Hz to 2 kHz
z Low Total Harmonic Distortion
• -118 dB THD typical (0.000126%)
• -112 dB THD maximum (0.000251%)
z Low Power Consumption
• Normal operation: 5 mA
• Power down: 10 µA
z Dual Power Supply Configuration
• VA+ = +2.5 V; VA- = -2.5 V;VD = +3.3 V
Description
The CS3302A is a high input-impedance, differential in-
put, differential output amplifier with programmable
gain, optimized for amplifying signals from high-imped-
ance sensors such as hydrophones. The gain settings
are binary weighted (x1, x2, x4, x8, x16, x32, x64) and
are selected using simple pin settings. Two sets of ex-
ternal inputs, INA and INB, simplify system design as
inputs from a sensor and test DAC. An internal 800Ω
termination can also be selected for noise tests.
Amplifier input impedance is very high, requiring less
than 1 pA of input current. Noise performance is very
good at 1 µVp-p between 0.1 Hz and 10 Hz, and a noise
density of 8.5 nV/ √Hz over the 200 Hz to 2 kHz band-
width. Distortion performance is also extremely good,
typically -118 dB THD. Low input current, low noise, and
low total harmonic distortion make this amplifier ideal for
high-impedance differential sensors requiring maximum
dynamic range.
ORDERING INFORMATION
See page 15.
INA+
INB+
VA+
GUARD
+
-
VD
OUTR+
OUTF+
MUX0
MUX1
GAIN0
GAIN1
GAIN2
INA-
INB-
- OUTF-
OUTR-
+
VA- PWDN GND
Preliminary Product Information
http://www.cirrus.com
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
Copyright © Cirrus Logic, Inc. 2007
(All Rights Reserved)
NOV '07
DS765PP1
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THERMAL CHARACTERISTICS
CS3302A
DS765PP1
Parameter
Storage Temperature Range
Allowable Junction Temperature
Junction to Ambient Thermal Impedance
Ambient Operating Temperature
Symbol
TSTR
ΘJA
TA
CS3302A
CS3302A
Min Typ Max
-65 - 150
- - 125
- 65 -
-40 - +85
Unit
ºC
ºC
ºC / W
ºC
ANALOG CHARACTERISTICS
Parameter
Symbol
Noise Performance
Input Voltage Noise
f0 = 0.1 Hz to 10 Hz VNPP
Input Voltage Noise Density
f0 = 200 Hz to 2 kHz VND
Input Current Noise Density
Distortion Performance
(Note 4) IND
Total Harmonic Distortion (Note 5)
x1
x2
x4
x8 THD
x16
x32
x64
Linearity (Note 5)
x1
x2
x4
x8 LIN
x16
x32
x64
CS3302A
Min Typ
Max
Unit
-1
- 8.5
- 20
3 µVpp
12 nV/ Hz
- fA/ Hz
- -118
- -119
- -119
- -119
- -118
- -115
- -112
-112
-
-
-
-
-
-
- 0.0001259 0.0002512
- 0.0001122
-
- 0.0001122
-
- 0.0001122
-
- 0.0001259
-
- 0.0001778
-
- 0.0002512
-
dB
%
Notes: 4. Guaranteed by design and/or characterization.
5. Tested with a 31.25 Hz sine wave at -1 dB amplitude.
CS3302A In-Band Noise
CS3302A Wide Band Noise
20
15
10
5
0
0 200 400 600 800 1000 1200 1400 1600 1800 2000
Frequency (Hz)
300
250
200
150
100
50
0
0.1
1
10 100 1000 10000 100000 1E+06
Frequency (Hz)
Figure 1. CS3302A Noise Performance
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CS3302A
DS765PP1
CS3302A
Differential
Sensor
CS3301A
CS3302A
M
U AMP
X
CS5373A
∆Σ
Modulator
Test
DAC
CS5378
Digital Filter
µController
or
Configuration
EEPROM
System
Telemetry
Figure 4. System Architecture
requires two series resistors and a differential capaci-
tor to create the modulator anti-alias RC filter.
2.1.3 Differential Signals
Analog signals into and out of the CS3302A are
differential, consisting of two halves with equal but
opposite magnitude varying about a common mode
voltage.
A full scale 5 Vpp differential signal centered on a
-0.15 V common mode can have:
SIG+ = -0.15 V + 1.25 V = 1.1 V
SIG- = -0.15 V - 1.25 V = -1.4 V
SIG+ is +2.5 V relative to SIG-
For the reverse case:
SIG+ = -0.15 V - 1.25 V = -1.4 V
SIG- = -0.15 V + 1.25 V = 1.1 V
SIG+ is -2.5 V relative to SIG-
The total swing for SIG+ relative to SIG- is
(+2.5 V) - (-2.5 V) = 5 Vpp. A similar calculation
can be done for SIG- relative to SIG+. Note that a
5 Vpp differential signal centered on a -0.15 V
common mode voltage never exceeds 1.1 V and
never drops below -1.4 V on either half of the sig-
nal.
By definition, differential voltages are to be mea-
sured with respect to the opposite half, not relative
to ground. A multimeter differentially measuring
between SIG+ and SIG- in the above example
would properly read 1.767 Vrms, or 5 Vpp.
2.1.4 Guard Output
The GUARD pin outputs the common mode volt-
age of the currently selected analog signal input. It
can be used to drive the cable shield between a
high-impedance sensor and the amplifier inputs.
Driving the cable shield with the analog signal
common mode voltage minimizes leakage and im-
proves signal integrity from high-impedance sen-
sors.
The GUARD output is defined as the midpoint
voltage between the + and - halves of the currently
selected differential input signal, and will vary as
the signal common mode varies. The GUARD out-
put will not drive a significant load, it only pro-
vides a shielding voltage.
2.2 Digital Signals
2.2.1 Gain Selection
The CS3302A supports gain ranges of x1, x2, x4,
x8, x16, x32, and x64. They are selected using the
GAIN0, GAIN1, and GAIN2 pins as shown in
Table 1 on page 8.
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