LT6203CMS8#TRPBF Linear Technology, LT6203CMS8#TRPBF Datasheet - Page 18
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LT6203CMS8#TRPBF
Manufacturer Part Number
LT6203CMS8#TRPBF
Description
IC OPAMP R-R INOUT DUAL LP 8MSOP
Manufacturer
Linear Technology
Datasheet
1.LT6202CS8PBF.pdf
(24 pages)
Specifications of LT6203CMS8#TRPBF
Amplifier Type
General Purpose
Number Of Circuits
2
Output Type
Rail-to-Rail
Slew Rate
25 V/µs
Gain Bandwidth Product
100MHz
Current - Input Bias
3.8µA
Voltage - Input Offset
2600µV
Current - Supply
2.8mA
Current - Output / Channel
40mA
Voltage - Supply, Single/dual (±)
2.5 V ~ 12.6 V, ±1.25 V ~ 6.3 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
-3db Bandwidth
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
LT6202/LT6203/LT6204
TYPICAL APPLICATIONS
Single-Supply 16-Bit ADC Driver
Figure 5 shows the LT6203 driving an LTC1864 unipolar
16-bit A/D converter. The bottom half of the LT6203 is in
a gain-of-one confi guration and buffers the 0V negative
full-scale signal V
LTC1864. The top half of the LT6203 is in a gain-of-ten
confi guration referenced to the buffered voltage V
drives the positive input of the LTC1864. The input range
of the LTC1864 is 0V to 5V, but for best results the input
range of V
0.82V. Figure 6 shows an FFT obtained with a 10.1318kHz
coherent input waveform, from 8192 samples with no
windowing or averaging. Spurious free dynamic range is
seen to be about 100dB.
18
IN
should be from V
V
LOW
LOW
= 0.4V
V
IN
±200mV
= 0.6V
into the negative input of the
DC
DC
AC
LOW
+
–
1/2 LT6203
(about 0.4V) to about
+
1/2 LT6203
–
–100
–110
–120
–130
–140
–150
Figure 5. Single-Supply 16-Bit ADC Driver
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
Figure 6. FFT Showing 100dB SFDR
0
110Ω
12.5 25
R1
R2
1k
LOW
37.5
and
FREQUENCY (kHz)
100Ω
100Ω
R4
50
R3
62.5
470pF
f
f
Although the LTC1864 has a sample rate far below the
gain bandwidth of the LT6203, using this amplifi er is not
necessarily a case of overkill. The designer is reminded
that A/D converters have sample apertures that are
vanishingly small (ideally, infi nitesimally small) and make
demands on the upstream circuitry far in excess of what is
implied by the innocent-looking sample rate. In addition,
when an A/D converter takes a sample, it applies a small
capacitor to its inputs with a fair amount of glitch energy
and expects the voltage on the capacitor to settle to the
true value very quickly. Finally, the LTC1864 has a 20MHz
analog input bandwidth and can be used in undersampling
applications, again requiring a source bandwidth higher
than Nyquist.
S
IN
75 82.5
C1
= 250ksps
= 10.131836kHz
100
LT6202/03/04 F06
112.5 125
+
–
LTC1864
250ksps
16-BIT
5V
LT6202/03/04 F05
SERIAL
DATA
OUT
620234fb