参数资料
型号: LT6203CDD#TRPBF
厂商: Linear Technology
文件页数: 14/28页
文件大小: 0K
描述: IC OPAMP R-R IN/OUT DUAL LP 8DFN
标准包装: 2,500
放大器类型: 通用
电路数: 2
输出类型: 满摆幅
转换速率: 25 V/µs
增益带宽积: 100MHz
电流 - 输入偏压: 3.8µA
电压 - 输入偏移: 2600µV
电流 - 电源: 2.8mA
电流 - 输出 / 通道: 40mA
电压 - 电源,单路/双路(±): 2.5 V ~ 12.6 V,±1.25 V ~ 6.3 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 8-WFDFN 裸露焊盘
供应商设备封装: 8-DFN-EP(3x3)
包装: 带卷 (TR)
LT6202/LT6203/LT6204
21
620234fd
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 configuration and buffers the 0V nega-
tive full-scale signal VLOW into the negative input of the
LTC1864. The top half of the LT6203 is in a gain-of-ten
configuration referenced to the buffered voltage VLOW and
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 VIN should be from VLOW (about 0.4V) to about
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.
Although the LTC1864 has a sample rate far below the
gain bandwidth of the LT6203, using this amplifier is not
necessarilyacaseofoverkill.Thedesignerisremindedthat
A/D converters have sample apertures that are vanishingly
small (ideally, infinitesimally small) and make demands on
the upstream circuitry far in excess of what is implied by
theinnocent-lookingsamplerate.Inaddition,whenanA/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
bandwidthandcanbeusedinundersamplingapplications,
again requiring a source bandwidth higher than Nyquist.
+
+
+
LTC1864
16-BIT
250ksps
5V
SERIAL
DATA
OUT
C1
470pF
R3
100
R4
100
R1
1k
R2
110
VIN = 0.6VDC
±200mVAC
VLOW = 0.4VDC
1/2 LT6203
LT6202/03/04 F05
Figure 5. Single-Supply 16-Bit ADC Driver
FREQUENCY (kHz)
0
SFDR
(dB)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
37.5
62.5
100
LT6202/03/04 F06
12.5 25
50
75 82.5
112.5 125
fS = 250ksps
fIN = 10.131836kHz
Figure 6. FFT Showing 100dB SFDR
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