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PDF CS3302 Data sheet ( Hoja de datos )
| Número de pieza | CS3302 | |
| Descripción | HIGH-Z PROGRAMMABLE GAIN DIFFERENTIAL AMPLIFIER | |
| Fabricantes | Cirrus Logic | |
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CS3302
High-Z Programmable Gain Differential Amplifier
Features
Description
Signal bandwidth: DC to 2 kHz
Selectable gain: x1, x2, x4, x8, x16, x32, x64
Differential inputs, differential outputs
• Multiplexed inputs: INA, INB, 800Ω termination
• Rough / fine charge outputs for CS5371/72
• Max signal amplitude: 5 Vp-p differential
• Ultra-low input bias: < 1 pA
Excellent noise performance
• 1 µVp-p between 0.1 Hz and 10 Hz
• 8.5 nV/ √Hz from 200 Hz to 2 kHz
Low total harmonic distortion
• -118 dB THD typical (0.000126%)
• -112 dB THD maximum (0.000251%)
Low power consumption
• Normal / LPWR / PWDN: 5 mA, 3.3 mA, 10 µA
Single or dual power supply configurations
• VA+ = +5 V; VA- = 0 V; VD = +3.3 V to +5 V
• VA+ = +2.5 V;VA- = -2.5 V;VD = +3.3 V
The CS3302 is a high input impedance differential in, dif-
ferential out amplifier with programmable gain, optimized
for amplifying signals from high impedance 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 external inputs, INA and
INB, simplify system design as inputs from a sensor and
test DAC. An internal 800Ω termination can also be se-
lected 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
CS3302-IS -40ºC to +85ºC 24-pin SSOP
VA+
GUARD
VD
INA+
INB+
MUX0
MUX1
+ 570500 Ω
OUTR+
- OUTF+
57050 Ω
GAIN0
GAIN1
GAIN2
INA-
INB-
570500 Ω
- OUTF-
OUTR-
+ 57050 Ω
VA- LPWR PWDN DGND
Preliminary Product Information
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
Cirrus Logic, Inc.
www.cirrus.com
Copyright Cirrus Logic, Inc. 2003
(All Rights Reserved)
JUN ‘03
DS596PP2
1
1 page  
CS3302
THERMAL CHARACTERISTICS
Parameter
Allowable Junction Temperature
Junction to Ambient Thermal Impedance
Ambient Operating Temperature (Power Applied)
Symbol
ΘJA
TA
CS3302
Min Typ Max
- - 135
- 65 -
-40 - +85
Unit
ºC
ºC / W
ºC
ANALOG CHARACTERISTICS
Parameter
Noise Performance, Normal Power
Input Voltage Noise
f0 = 0.1 Hz to 10 Hz
Input Voltage Noise Density
f0 = 200 Hz to 2 kHz
Input Current Noise Density
(Note 4)
Noise Performance, Low Power (LPWR=1)
Input Voltage Noise
f0 = 0.1 Hz to 10 Hz
Input Voltage Noise Density
f0 = 200 Hz to 2 kHz
Input Current Noise Density
(Note 4)
Distortion Performance, Normal Power
Total Harmonic Distortion
(Note 5, 6)
Linearity
(Note 5, 6)
Distortion Performance, Low Power (LPWR=1)
Total Harmonic Distortion
(Note 5, 6)
Linearity
(Note 5, 6)
Symbol
VNPP
VND
IND
VNPP
VND
IND
THD
LIN
THD
LIN
CS3302
Min Typ Max
Unit
- 1 1.5 µVp-p
- 8.5 12 nV/ Hz
- 1 - fA/ Hz
- 1 1.5 µVp-p
- 10 15 nV/ Hz
- 1 - fA/ Hz
- -118 -112
- 0.000126 0.000251
dB
%
- -118 -110
- 0.000126 0.000316
dB
%
Notes: 4. Guaranteed by design and/or characterization.
5. Tested with a full scale input signal of 31.25 Hz.
6. Noise in the harmonic bins dominates THD and linearity measurements for x16, x32, and x64 gains.
CS3302 In-Band Noise
20
15
10
5
0
0 200 400 600 800 1000 1200 1400 1600 1800 2000
Frequency (Hz)
CS3302 Wide Band Noise
300
250
200
150
100
50
0
0.1
1
10 100 1000 10000 100000 1E+06
Frequency (Hz)
Figure 1. CS3302 Noise Performance
5
5 Page 
CS3302
2.1.3 Differential Signals
Analog signals into and out of the CS3302 are dif-
ferential, 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
2.5 V common mode can have:
SIG+ = 2.5 V + 1.25 V = 3.75 V
SIG- = 2.5 V - 1.25 V = 1.25 V
SIG+ is +2.5 V relative to SIG-
For the reverse case:
SIG+ = 2.5 V - 1.25 V = 1.25 V
SIG- = 2.5 V + 1.25 V = 3.75 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 2.5 V com-
mon mode voltage never exceeds 3.75 V and never
drops below 1.25 V on either half of the signal.
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 improves sig-
nal integrity from high impedance sensors.
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 provides
a shielding voltage.
2.2 Digital Signals
2.2.1 Gain Selection
The CS3302 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.
2.2.2 Mux Selection
The analog inputs to the amplifier are multiplexed,
with external signals applied to the INA+, INA- or
INB+, INB- pins. An internal termination is also
available for noise tests. Input mux selection is
made using the MUX0 and MUX1 pins as shown in
Table 1 on page 8.
Although a mux selection is provided to enable the
INA and INB switches simultaneously, significant
current should not be driven through them in this
mode. The CS3302 mux switches will maintain
good linearity only with minimal signal current.
2.2.3 Low Power Selection
For applications where power is critical, a low-
power mode can be selected. This mode reduces
amplifier power consumption at the expense of
slightly degraded performance. Low power mode
is selected using the LPWR pin, which is active
high.
2.2.4 Power Down Selection
A power-down mode is available to shut down the
amplifier when not in use. When enabled, all inter-
nal circuitry is disabled, the analog inputs and out-
puts go high-impedance, and the device enters a
micro-power state. Power down mode is selected
using the PWDN pin, which is active high.
2.3 Power Supplies
2.3.1 Analog Power Supplies
The analog power pins of the CS3302 are to be sup-
plied with a total of 5 V between VA+ and VA-.
This voltage can be from a unipolar +5 V / 0 V sup-
ply or a bipolar +2.5 V / -2.5 V supply. When using
a unipolar supply, analog signal common mode
should be biased to 2.5 V, and when using bipolar
supplies it should be biased to 0 V. The analog
power supplies are recommended to be bypassed to
system ground using 0.1 µF X7R type capacitors.
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet CS3302.PDF ] | |
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