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| 型号： | DC1444A-B |
| 厂商： | Linear Technology |
| 文件页数： | 5/26页 |
| 文件大小： | 0K |
| 描述： | BOARD SAR ADC LTC2305 |
| 软件下载： | QuikEval System |
| 设计资源： | DC1444A Design File DC1444A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 2 |
| 位数： | 12 |
| 采样率（每秒）： | 14k |
| 数据接口： | I²C，串行 |
| 在以下条件下的电源（标准）： | 1.5mW @ 1kSPS |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2305 |
| 已供物品： | 板 |
| 相关产品： | LTC2305IMS#TRPBF-ND - IC ADC 12-BIT 2CHN 12-MSOP LTC2305IDE#TRPBF-ND - IC ADC 12-BIT 2CHN 12-DFN LTC2305IDE#PBF-ND - IC ADC 12-BIT 2CHN 12-DFN LTC2305HMS#TRPBF-ND - IC ADC 12-BIT 2CHN 12-MSOP LTC2305HMS#PBF-ND - IC ADC 12-BIT 2CHN 12-MSOP LTC2305CMS#TRPBF-ND - IC ADC 12-BIT 2CHN 12-MSOP LTC2305CMS#PBF-ND - IC ADC 12-BIT 2CHN 12-MSOP LTC2305CDE#TRPBF-ND - IC ADC 12-BIT 2CHN 12-DFN LTC2305CDE#PBF-ND - IC ADC 12-BIT 2CHN 12-DFN LTC2305IMS#PBF-ND - IC ADC 12BIT I2C 12-MSOP |
LTC2301/LTC2305
13
23015fb
APPLICATIONS INFORMATION
Table 2. Channel Conguration for the LTC2301
O/S
IN+
IN–
0+
–
1–
+
Figure 1a. Example MUX Congurations
Figure 1b. Changing the MUX Assignment “On the Fly”
CH0
CH1
GND (
–)
2 Single-Ended
+
1 Differential
+ (–)
+
– (+)
1 Differential
+ (–)
– (+)
{
23015 F01a
CH0
CH1
CH0
CH1
LTC2305
LTC2301
GND (
–)
1st Conversion
2nd Conversion
+
–
+
–
{{
CH0
CH1
CH0
CH1
23015 F01b
LTC2305
Driving the Analog Inputs
The analog inputs of the LTC2301/LTC2305 are easy to
drive. Each of the analog inputs of the LTC2305 (CH0 and
CH1) can be used as single-ended input relative to GND
or as a differential pair. The analog inputs of the LTC2301
(IN+, IN–) are always congured as a differential pair.
Regardless of the MUX conguration, the “+” and “–“
inputs are sampled at the same instant. Any unwanted
signal that is common to both inputs will be reduced by
the common mode rejection of the sample-and-hold cir-
cuit. The inputs draw only one small current spike while
chargingthesample-and-holdcapacitorsduringtheacquire
mode. In conversion mode, the analog inputs draw only
a small leakage current. If the source impedance of the
driving circuit is low, the ADC inputs can be driven directly.
Otherwise, more acquisition time should be allowed for a
source with higher impedance.
Input Filtering
The noise and distortion of the input amplier and other
circuitry must be considered since they will add to the
ADC noise and distortion. Therefore, noisy input circuitry
should be ltered prior to the analog inputs to minimize
noise. A simple 1-pole RC lter is sufcient for many
applications.
The analog inputs of the LTC2301/LTC2305 can be modeled
as a 55pF capacitor (CIN) in series with a 100Ω resistor
(RON), as shown in Figure 2a. CIN gets switched to the
selected input once during each conversion. Large lter
RC time constants will slow the settling of the inputs. It
is important that the overall RC time constants be short
enough to allow the analog inputs to completely settle to
12-bit resolution within the acquisition time (tACQ) if DC
accuracy is important.
When using a lter with a large CFILTER value (e.g. 1μF),
the inputs do not completely settle and the capacitive input
switching currents are averaged into a net DC current
(IDC). In this case, the analog input can be modeled by an
equivalent resistance (REQ = 1/(fSMPL CIN)) in series with
an ideal voltage source (VREFCOMP/2),asshowninFigure2b.
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