参数资料
型号: LTC1606ISW#PBF
厂商: Linear Technology
文件页数: 16/16页
文件大小: 0K
描述: IC A/D CONV 16BIT SAMPLNG 28SOIC
标准包装: 27
位数: 16
采样率(每秒): 250k
数据接口: 并联
转换器数目: 1
功率耗散(最大): 100mW
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: 28-SOIC(0.295",7.50mm 宽)
供应商设备封装: 28-SOIC
包装: 管件
输入数目和类型: 1 个单端,双极
9
LTC1606
1606fa
capacitor as close to the device input pin as possible. If an
amplifier is to be used to drive the input, care should be
taken to select an amplifier with adequate accuracy, linear-
ity and noise for the application. The following list is a
summary of the op amps that are suitable for driving the
LTC1606. More detailed information is available in the
Linear Technology data books and LinearView
TM CD-ROM.
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. 300
A
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 supply
current. Good AC/DC specs.
LT1364/LT1365: Dual and quad 50MHz voltage feedback
amplifiers. 6.3mA supply current per amplifier. Good AC/
DC specs.
LT1468: 90MHz 22V/
s 16-bit accurate amplifier.
LT1469: Dual LT1468
Internal Voltage Reference
The LTC1606 has an on-chip, temperature compensated,
curvature corrected, bandgap reference, which is factory
trimmed to 2.50V. The full-scale range of the ADC is equal
to (
±4 VREF) or nominally ±10V. The output of the
reference is connected to the input of a buffer (1.64x)
through a 4k resistor (see Figure 3). The input to the buffer
or the output of the reference is available at REF (Pin 3).
The internal reference can be overdriven with an external
reference if more accuracy is needed. The buffer output
drives the internal DAC and is available at CAP (Pin 4). The
CAP pin can be used to drive a steady DC load of less than
2mA. Driving an AC load is not recommended because it
can cause the performance of the converter to degrade.
Figure 3. Internal or External Reference Source
+
1606 F03
INTERNAL
CAPACITOR
DAC
BANDGAP
REFERENCE
4k
10
F
CAP
(4.096V)
2.2
F
REF
(2.5V)
4
3
R
0.64R
APPLICATIO S I FOR ATIO
WU
UU
For minimum code transition noise, the REF pin and the
CAP pin should each be decoupled with a capacitor to
filter wideband noise from the reference and the buffer
(2.2
F tantalum for the REF pin and 10F tantalum for the
CAP pin). To prevent the 10
F bypass capacitor from
discharging through the CAP pin if the positive supply
(VDIG and VANA) were to drop, a diode (1N4148 or
equivalent) can be placed between the CAP pin and the
positive supply.
Offset and Gain Adjustments
The LTC1606 offset and full-scale errors have been trimmed
at the factory with the external resistors shown in Figure
4. This allows for external adjustment of offset and full
scale in applications where absolute accuracy is impor-
tant. See Figure 5 for the offset and gain trim circuit. The
100k resistor in parallel with the 33.2k is only needed for
externally trimming the offset. First, adjust the offset to
zero by adjusting resistor R3. Apply an input voltage
of –152.6
V (–0.5LSB) and adjust R3 so the code is
+
5
4
3
2
1
10
F
+ 2.2F
33.2k
1%
±10V INPUT
200
1%
VIN
AGND1
REF
CAP
4.096V
AGND2
LTC1606
1606 F04
Figure 4.
±10V Input Without Trim
LinearView is a trademark of Linear Technology Corporation
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