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参数资料
| 型号： | LTC2226IUH#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 25MSPS SAMPL 32-QFN |
| 标准包装： | 73 |
| 位数： | 12 |
| 采样率（每秒）： | 25M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 90mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 管件 |
| 输入数目和类型： | 1 个单端，双极; 1 个差分，双极 |
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LTC2228/LTC2227/LTC2226
19
222876fb
TYPICAL APPLICATIONS
Reference Operation
Figure 9 shows the LTC2228/LTC2227/LTC2226 refer-
ence circuitry consisting of a 1.5V bandgap reference,
a difference amplier and switching and control circuit.
The internal voltage reference can be congured for two
pin selectable input ranges of 2V (±1V differential) or 1V
(±0.5V differential). Tying the SENSE pin to VDD selects
the 2V range; tying the SENSE pin to VCM selects the 1V
range.
The 1.5V bandgap reference serves two functions: its
output provides a DC bias point for setting the common
mode voltage of any external input circuitry; additionally,
the reference is used with a difference amplier to gener-
ate the differential reference levels needed by the internal
ADC circuitry. An external bypass capacitor is required
for the 1.5V reference output, VCM. This provides a high
frequency low impedance path to ground for internal and
external circuitry.
The difference amplier generates the high and low
reference for the ADC. High speed switching circuits are
connected to these outputs and they must be externally
bypassed. Each output has two pins. The multiple output
pins are needed to reduce package inductance. Bypass
capacitors must be connected as shown in Figure 9.
Other voltage ranges in-between the pin selectable ranges
can be programmed with two external resistors as shown
in Figure 10. An external reference can be used by ap-
plying its output directly or through a resistor divider to
SENSE. It is not recommended to drive the SENSE pin
with a logic device. The SENSE pin should be tied to the
appropriate level as close to the converter as possible. If
the SENSE pin is driven externally, it should be bypassed
to ground as close to the device as possible with a 1μF
ceramic capacitor.
VCM
REFH
SENSE
TIE TO VDD FOR 2V RANGE;
TIE TO VCM FOR 1V RANGE;
RANGE = 2 VSENSE FOR
0.5V < VSENSE < 1V
1.5V
REFL
2.2μF
INTERNAL ADC
HIGH REFERENCE
BUFFER
0.1μF
222876 F09
LTC2228/27/26
4Ω
DIFF AMP
1μF
INTERNAL ADC
LOW REFERENCE
1.5V BANDGAP
REFERENCE
1V
0.5V
RANGE
DETECT
AND
CONTROL
Figure 9. Equivalent Reference Circuit
VCM
SENSE
1.5V
0.75V
2.2μF
12k
1μF
12k
222876 F10
LTC2228/27/26
Figure 10. 1.5V Range ADC
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相关代理商/技术参数 |
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|---|---|
| LTC2226IUH-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:12-Bit, 65/40/25Msps Low Power 3V ADCs |
| LTC2226IUH-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:12-Bit, 65/40/25Msps Low Power 3V ADCs |
| LTC2226LX | 制造商:LINER 制造商全称:Linear Technology 功能描述:12-Bit, 25Msps 125°C ADC in LQFP |
| LTC2227 | 制造商:LINER 制造商全称:Linear Technology 功能描述:14-Bit, 80Msps Low Power 3V ADC |
| LTC2227CUH | 制造商:LINER 制造商全称:Linear Technology 功能描述:12-Bit, 65/40/25Msps Low Power 3V ADCs |
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