参数资料
型号: LTC6254IMS#PBF
厂商: Linear Technology
文件页数: 8/26页
文件大小: 0K
描述: IC OPAMP R-R 720MHZ MSOP-16
标准包装: 37
放大器类型: 通用
电路数: 4
输出类型: 满摆幅
转换速率: 280 V/µs
增益带宽积: 720MHz
-3db带宽: 400MHz
电流 - 输入偏压: 1.4µA
电压 - 输入偏移: 100µV
电流 - 电源: 4.25mA
电流 - 输出 / 通道: 100mA
电压 - 电源,单路/双路(±): 2.5 V ~ 5.25 V,±1.25 V ~ 2.625 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-TFSOP(0.118",3.00mm 宽)
供应商设备封装: 16-MSOP
包装: 管件
LTC6252/LTC6253/LTC6254
16
625234fc
Figure 3. 5V Single Supply 16-Bit ADC Driver
TYPICAL APPLICATIONS
5V Single-Supply 16-Bit ADC Driver
Figure 3 shows the LTC6253 driving an LTC2393-16 16-bit
A/D converter on a single 5V supply. The low wideband
noise of the LTC6253 helps to achieve better than 93dB
SNR. A gain of 1.17V/V is taken in the first amplifier, giv-
ing an input voltage range of 3.5VP-P for a full-scale input
to the ADC. By taking a small amount of gain, a –1dBFS
Figure 4. LTC6253 Driving LTC2393-16
16b ADC 5V Single-Supply Performance
5V
0.1F
10F
5V
~2.08V
0.1F
10F
SER/PAR
BYTESWAP
OB/2C
CS
RD
BUSY
PARALLEL
OR
SERIAL
INTERFACE
OGND
625234 F03
IN
IN+
3900pF
249
100
VIN
27.4mV TO
(3.5V + 27.4mV)
GND
RESET
CNVST PD
SAMPLE CLOCK
REFOUT
REFIN
AVP
DVP
LTC2393-16
OVP
1.8V TO 5V
16 BIT
VCM
1F
10F
2.5k
143
845
4.7F
+
LTC6253
5V
+
LTC6253
FREQUENCY (kHz)
0
AMPLITUDE
(dBFS)
0
–80
–20
–40
–60
–100
–120
–140
–160
200
400
100
300
624678 F04
500
fS = 1Msps
F1 = 20.111kHz
F1 AMPLITUDE
= –1.032dBFS
SNR = 93.28dB
THD = –100.50dB
SINAD = 92.53dB
SFDR = 104.7dB
F2 = –106.39dBc
F3 = –104.70dBc
F4 = –114.13dBc
F5 = –105.48dBc
output can be easily obtained without the amplifier transi-
tioning between input regions, thus minimizing crossover
distortion. Furthermore, by driving VCM with 2.08V from
the ADC’s VCM pin, the LTC6253 is capable of driving the
LTC2393-16 to within 0.1dB of full scale. Figure 4 shows
an FFT obtained with a sampling rate of 1Msps and a
20kHz input waveform. Spurious free dynamic range is
an excellent 104.7dB.
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