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PDF CS3301 Data sheet ( Hoja de datos )
| Número de pieza | CS3301 | |
| Descripción | Differential Amplifier | |
| Fabricantes | Cirrus Logic | |
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CS3301
Low-noise, Programmable Gain, Differential Amplifier
Features & Desription
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 CS5371/72
• Max signal amplitude: 5 Vpp differential
• Low input bias: 500 pA
z Outstanding Noise Performance
• 0.20 µVp-p between 0.1 Hz and 10 Hz
• 8.5 nV/ Hz from 0.1 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/LPWR/PWDN: 5.5 mA, 3.5 mA, 10 µA
z 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 CS3301 is a low-noise differential input, differential
output amplifier with programmable gain, optimized for
amplifying signals from low-impedance sensors such as
geophones. 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 800 Ω termination can also be selected
for noise tests.
Amplifier noise performance is outstanding with a noise
density of 8.5 nV/ Hz over the 0.1 Hz to 2 kHz band-
width. Distortion performance is also extremely good,
typically -118 dB THD. Flat noise down to 0.1 Hz and
low total harmonic distortion make this amplifier ideal for
low-frequency, low-amplitude, differential signals requir-
ing maximum dynamic range.
ORDERING INFORMATION
See page 15.
INA+
INB+
VA+
MUX0
MUX1
INA-
INB-
VA-
CLK
VD
+ 658000 Ω
OUTR+
- OUTF+
65800 Ω
GAIN0
GAIN1
GAIN2
65800 Ω
- OUTF-
OUTR-
+ 65800 Ω
LPWR PWDN DGND
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2007
(All Rights Reserved)
DEC ‘07
DS595F3
1 page  
CS3301
THERMAL CHARACTERISTICS
Parameter
Allowable Junction Temperature
Junction to Ambient Thermal Impedance
Ambient Operating Temperature (Power Applied)
Symbol Min Typ Max
Unit
-
- 135
ºC
ΘJA - 65 - ºC / W
TA -40 - +85 ºC
ANALOG CHARACTERISTICS
Parameter
Noise Performance, Normal
Input Voltage Noise
f0 = 0.1 Hz to 10 Hz
Input Voltage Noise Density
f0 = 0.1 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 = 0.1 Hz to 2 kHz
Input Current Noise Density
(Note 4)
Distortion Performance, Normal
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
CS3301
Min Typ Max
Unit
-
0.20 0.40
µVp-p
- 8.5 12.0 nV/ Hz
- 200 - fA/ Hz
-
0.25 0.50
µVp-p
-
10.0
15.0
nV/ Hz
- 100 - 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, x64 gains.
CS3301 In-Band Noise
20
15
10
5
0
0 200 400 600 800 1000 1200 1400 1600 1800 2000
Frequency (Hz)
CS3301 Wide Band Noise
300
250
200
150
100
50
0
0.1
1
10 100 1000 10000 100000 1E+06
Frequency (Hz)
Figure 1. CS3301 Noise Performance
DS595F3
5
5 Page 
CS3301
2.1.3 Differential Signals
Analog signals into and out of the CS3301 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
-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.
2.2 Digital Signals
2.2.1 Clock Input
The clock signal is used by the chopper-
stabilization circuitry of the amplifier analog in-
puts. The CLK pin can be driven by an external
clock source for synchronous operation, or CLK
can be grounded to run from its own internally gen-
erated clock signal. The CLK pin is connected to a
clock detect circuit which will disable the internal
clock and use an external clock if one is supplied.
If the internal clock signal is to be used, the CLK
pin should be connected to DGND.
2.2.2 Gain Selection
The CS3301 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.
2.2.3 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 CS3301 mux switches will maintain
good linearity only with minimal signal currents.
2.2.4 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.
2.2.5 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 CS3301 are to be sup-
plied with a total of 5 V between VA+ and VA-.
This voltage is typically from a bipolar ±2.5 V
power supply. When using bipolar power supplies,
the analog signal common mode voltage should be
biased to 0 V. The analog power supplies are rec-
DS595F3
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet CS3301.PDF ] | |
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