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LT1358 Datasheet(PDF) 25 Page - Linear Technology

Part # LT1358
Description  18-Bit, 1Msps 8-Channel Differential 짹10.24V Input SoftSpan ADC with Wide Input Common Mode Range
PDF  40 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1358 Datasheet(HTML) 25 Page - Linear Technology

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LTC2335-18
25
233518f
For more information www.linear.com/LTC2335-18
Buffering Single-Ended Analog Input Signals
While the circuit shown in Figure 6a is capable of buffering
single-ended input signals, the circuit shown in Figure 9 is
preferable when the single-ended signal reference level is
inherently low impedance and doesn't require buffering.
This circuit eliminates one driver and lowpass filter, reduc-
ing part count, power dissipation, and SNR degradation
due to driver noise. Using the recommended driver and
filter combinations in Table 2, the performance of this
circuit with single-ended input signals is on par with the
performance of the circuit in Figure 6a.
applicaTions inForMaTion
Figure 8. Sense Voltage (CH0) and Current (CH1)
Over a Wide Common Mode Range
Figure 7c. IN+/IN– = 450mV 2kHz Fully Differential Sine,
0V ≤ VCM ≤ 24V, 32k Point FFT, fSMPL = 200ksps. Circuit
Shown in Figure 7a
Figure 7b. CMRR vs Input Frequency. Circuit Shown in Figure 7a
Figure 9. Buffering Single-Ended Input Signals. See Table 2 For Recommended Amplifier and Filter Combinations
–15V
15V
LTC2335-18
233518 F08
ONLY CHANNELS 0 AND 1 SHOWN FOR CLARITY
0.1µF
0.1µF
0.1µF
47µF
–10.24V ≤ VS1 ≤ 10.24V
–10.24V ≤ VS2 ≤ 10.24V
VS1 – VS2
RSENSE
ISENSE =
IN0+
IN0–
IN1+
IN1–
VCC
REFIN
REFBUF
VEE
ISENSE
RSENSE
VS2
VS1
–15V
–15V
15V
15V
LTC2335-18
233518 F09
ONLY CHANNEL 0 SHOWN FOR CLARITY
TRUE BIPOLAR
+10V
0V
–10V
+10V
0V
–10V
UNIPOLAR
–
+
0.1µF
0.1µF
0.1µF
47µF
IN0+
IN0–
AMPLIFIER
VCC
REFIN
REFBUF
VEE
OPTIONAL
LOWPASS FILTER
CFILT
RFILT
IN+
IN–
±5V RANGE
IN+ = IN– = 1VP-P SINE
IN+ = IN– = 24VP-P SINE
OP AMPS SLEW fIN > 30kHz
FREQUENCY (Hz)
10
100
1k
10k
100k
50
60
70
80
90
100
110
120
233518 F07b
±5V RANGE
FULLY DIFFERENTIAL DRIVE (IN– = +IN+)
SNR = 90.0dB
THD = –113dB
SINAD = 90.0dB
SFDR = 117dB
FREQUENCY (kHz)
0
20
40
60
80
100
–180
–160
–140
–120
–100
–80
–60
–40
–20
0
233518 F07c



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