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| 型号： | LTC1604CG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/20页 |
| 文件大小： | 0K |
| 描述： | IC A/D CONV 16BIT SAMPLNG 36SSOP |
| 标准包装： | 2,000 |
| 位数： | 16 |
| 采样率（每秒）： | 333k |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 350mW |
| 电压电源： | 双 ± |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 36-SSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 2 个单端，双极；1 个差分，双极 |
LTC1604
12
1604fa
starts (settling time must be 200ns for full throughput
rate).
Choosing an Input Amplifier
Choosing an input amplifier is easy if a few requirements
are taken into consideration. First, to limit the magnitude
of the voltage spike seen by the amplifier from charging
the sampling capacitor, choose an amplifier that has a low
output impedance (<100Ω) at the closed-loop band-width
frequency. For example, if an amplifier is used in a gain
of +1 and has a unity-gain bandwidth of 50MHz, then the
output impedance at 50MHz should be less than 100Ω.
The second requirement is that the closed-loop bandwidth
must be greater than 15MHz to ensure adequate small-
signal settling for full throughput rate. If slower op amps
are used, more settling time can be provided by increasing
the time between conversions.
The best choice for an op amp to drive the LTC1604 will
depend on the application. Generally applications fall into
two categories: AC applications where dynamic specifica-
tions are most critical and time domain applications where
DC accuracy and settling time are most critical. The follow-
ing list is a summary of the op amps that are suitable for
driving the LTC1604. More detailed information is available
in the Linear Technology databooks, the LinearView
CD-ROM and on our web site at: www.linear-tech. com.
LT1007: Low Noise Precision Amplifier. 2.7mA supply
current, ±5V to ±15V supplies, gain bandwidth product
8MHz, DC applications.
LT1097: Low Cost, Low Power Precision Amplifier. 300μA
supply current, ±5V to ±15V supplies, gain bandwidth
product 0.7MHz, DC applications.
LT1227: 140MHz Video Current Feedback Amplifier. 10mA
supply current, ±5V to ±15V supplies, low noise and low
distortion.
LT1360: 37MHz Voltage Feedback Amplifier. 3.8mA supply
current, ±5V to ±15V supplies, good AC/DC specs.
LT1363: 50MHz Voltage Feedback Amplifier. 6.3mA sup-
ply current, good AC/DC specs.
LT1364/LT1365: Dual and Quad 50MHz Voltage Feedback
Amplifiers. 6.3mA supply current per amplifier, good AC/
DC specs.
Input Filtering
The noise and the distortion of the input amplifier and
other circuitry must be considered since they will add to
the LTC1604 noise and distortion. The small-signal band-
width of the sample-and-hold circuit is 15MHz. Any noise
or distortion products that are present at the analog inputs
will be summed over this entire bandwidth. Noisy input
circuitry should be filtered prior to the analog inputs to
minimize noise. A simple 1-pole RC filter is sufficient for
many applications. For example, Figure 11 shows a 3000pF
capacitor from AIN+togroundanda100Ωsourceresistorto
limit the input bandwidth to 530kHz. The 3000pF capacitor
alsoactsasachargereservoirfortheinputsample-and-hold
and isolates the ADC input from sampling glitch sensitive
circuitry. High quality capacitors and resistors should be
used since these components can add distortion. NPO and
silver mica type dielectric capacitors have excellent linearity.
Carbon surface mount resistors can also generate distor-
tion from self heating and from damage that may occur
during soldering. Metal film surface mount resistors are
much less susceptible to both problems.
APPLICATIONS INFORMATION
SOURCE RESISTANCE (Ω)
1
10
100
1k
10k
ACQUISITION
TIME
(μs)
10
1
0.1
0.01
1604 F10
Figure 10. tACQ vs Source Resistance
LinearView is a trademark of Linear Technology Corporation.
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| LTC1604IG#TRPBF | 功能描述:IC A/D CONV 16BIT SAMPLNG 36SSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
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