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OPA2846 Datasheet(PDF) 10 Page - Texas Instruments

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Part # OPA2846
Description  Quad, Differential I/O, 2X1 Multiplexed High Gain Preamp
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

OPA2846 Datasheet(HTML) 10 Page - Texas Instruments

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MPA4609
10
SBOS252D
www.ti.com
CHANNEL SELECT
Two pins are provided to switch between input channels. Pin
3 controls channels B and D while pin 34 controls channels
A and C. These are normally tied together for tape preamp
applications but can be operated separately if the application
requires it. The channel select is a voltage control that
switches at approximately 1.25V. Voltages less than 0.9V
are guaranteed to select the REV channel while voltages >
1.6V will select the FOR channel. This allows a direct
interface to 3.3V (or lower) logic outputs. Virtually no pin
current is required in the logic high state while a low 70
µA/
pin out of the pin is required in the logic low state. Left
unconnected, the channel select defaults to the forward
selection.
The channels switch in approximately 50ns typically. With no
input present, there is minimal output glitching when switched.
CONNECTING TO LOW IMPEDANCE MR
HEADS FOR TAPE RECORDERS
The MPA4609 is designed to detect and amplify the voltage
signal from a Magneto Resistive (MR) head with minimal
SNR degradation from the SNR intrinsic to the head. A
typical MR head interface is shown in Figure 2. Not consid-
ering any postfiltering, the amplifier’s 0.65nV/
√Hz input noise
voltage and 90MHz bandwidth combine to produce a very
low 7.7
µV
RMS input referred noise floor. Even with a conser-
vative 20dB S/N margin, input signals as low as 77
µV
PP may
be detected. With a maximum differential output of 3VPP and
a 190V/V gain, a maximum input of 15.7mVPP may be
applied. This wide range of inputs translates into 46dB input
dynamic range. Since the MR head is biased through exter-
nal voltages, it is often required to connect the signal through
series blocking capacitors as shown in Figure 2. The high-
pass pole created by these capacitors (CB) and the source
resistance are selected to pass the lowest frequencies re-
quired by the system.
TWISTED PAIR RECEIVER
The extremely high gain and low input noise of the MPA4609
can provide a very capable, multi-channel, twisted pair re-
ceiver. This would be particularly useful for narrowband
higher frequency carriers that suffer from significant cable
loss. For broadband carriers, a high-pass filter should be
included to reduce the low frequency receiver power. Since
the MPA4609 provides a gain constant over frequency, the
lower frequency region, that does not have as much loss in
the twisted pair as the higher frequencies, can easily over-
drive the output without the high-pass filter present.
HIGH PERFORMANCE QUAD ADC DRIVER
The high gain, wide bandwidth, capability of the MPA4609
can provide a very cost effective input stage to quad high
performance ADCs. Figure 3 shows an example implemen-
tation where a 2nd-order passive low-pass filter has been
included in the interface to bandlimit the noise. The filter in
this example is set to approximately 18MHz cutoff with a
Butterworth (maximally flat) response including the internal
470
Ω output resistors in the design. The distortion perfor-
mance of the MPA4609 will support up to 10-bit converters
through approximately 10MHz maximum input analog fre-
quency. For a 2VPP output, the THD shown in the Typical
Characteristic Curves is
≤ 63dBc through 10MHz. The 18MHz
Butterworth filter limits the noise power bandwidth for
the amplifier output noise to approximately 20MHz. With a
0.65nV/
√Hz input voltage noise and 190V/V nominal gain,
this 124nV/
√Hz output noise integrates to approximately
555
µV
RMS at the differential input of the converter. This RMS
noise is approximately 1/2 of an LSB for a 2VPP full-scale
input range.
C
B
+V
B
C
B
R
BIAS
R
BIAS
MR
Element
Preamp
FIGURE 2. Typical MR Head Interface.
FIGURE 3. Quad, ADC Input Driver.
+5V
5.9
µH
470
5.9
µH
1/4
MPA4609
Quad
8
→ 10 Bit
ADC
1 of 4
Channels
Input
67pF
18MHz, 2nd-Order
Butterworth Filter
470


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