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| 型号： | LTC1411IG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC A/D CONV 14BIT 2.5MSPS 36SSOP |
| 标准包装： | 1,000 |
| 位数： | 14 |
| 采样率（每秒）： | 2.5M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 325mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°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 |
11
LTC1411
1411f
LT6203: Dual 100MHz, Low Noise, Low Power Op Amp.
Specified at 3V, 5V and
±5V supplies. 1.9nV/√Hz noise
voltage.
Programmable Input Range
The LTC1411 has two logic input pins (PGA0 and PGA1)
that are used to select one of four analog input ranges.
These input ranges are set by changing the reference
voltage that is applied to the internal DAC of the ADC
(REFCOM2). For the “0dB” setting the internal DAC sees
the full reference voltage of 4V. The analog input range is
0.7V to 4.3V with AIN– = 2.5V. This corresponds to an input
span of
±1.8V with respect to the voltage applied to AIN–
. For the “– 3dB” setting the internal reference is reduced
to 0.707 4V = 2.9V. Likewise the input span is reduced
to
±1.28V. The following table lists the input span with
respect to AIN– for the different PGA0 and PGA1 settings.
Table 1. Input Spans for LTC1411
INPUT
REFCOM2
PGA0
PGA1
LEVEL
SPAN
VOLTAGE
5V
0dB
±1.8V
4V
5V
0V
– 3dB
±1.28V
2.9V
0V
5V
– 6dB
±0.9V
2V
0V
– 9dB
±0.64V
1.45V
When changing from one input span to another, more time
is needed for the REFCOM2 pin to reach the correct level
because the bypass capacitor on the pin needs to be charged
or discharged. Figure 6 shows the recommended capaci-
tors at the REFCOM1 and REFCOM2 pins (10
F each).
When – 6dB or – 9dB is selected, the voltage at REFCOM1
(see Figure 2) must first settle before REFCOM2 reaches
the correct level. The typical delay is about 700ms.
When the REFCOM2 level is changed from 2.9V to 4V
(changing PGA setting from – 3dB to 0dB), the typical delay
is 0.6ms. However, if the voltage at REFCOM2 is changed
from 4V to 2.9V (changing PGA setting from 0dB to – 3dB)
only a 60
A sink current is present to discharge the 10F
bypass capacitor. In this case, the delay will be 11ms.
Internal Reference
The LTC1411 has an on-chip, temperature compensated,
curvature corrected, bandgap reference that is factory
trimmed to 2.500V. If this REFOUT pin is used to drive the
AIN– pin, a 22F tantalum bypass capacitor is required and
this REFOUT voltage sets the bipolar zero for the ADC.
The REFIN pin is connected to the reference buffer through
a 2k resistor and two PGA switches. The REFIN pin can be
connected to REFOUT directly or to an external reference.
Figure 6 shows the reference and buffer structure for the
LTC1411. The input to the reference buffer is either REFIN
or 1/2 of REFIN depending on the PGA selection. The
REFCOM1 pin bypassed with a 10
F tantalum capacitor
helps reduce the noise going into the buffer. The reference
buffer has a gain of 1.62 or 1.15 (depends on PGA
selection). It is compensated at the REFCOM2 pin with a
10
F tantalum capacitor. The input span of the ADC is set
by the output voltage of this REFCOM2 voltage. For a 2.5V
input at the REFIN pin, the REFCOM2 will have 4V output
for PGA1 = PGA0 = 5V and the ADC will have a span of 3.6V.
APPLICATIO S I FOR ATIO
WU
UU
Figure 6. Reference Structure for the LTC1411
for PGA1 = PGA0 = 5V
REFCOM2
10
F
1411 F06
REFCOM1
REFIN*
REFOUT
10
F
THIS PIN CAN BE TIED TO REFOUT OR AN EXTERNAL SOURCE
A 22
F CAPACITOR IS NEEDED IF REFOUT IS USED TO DRIVE AIN–
*
**
22
F**
2k
5k
2.5V
BANDGAP
REFERENCE
X1.62
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