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参数资料
| 型号： | LTC2202I |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | ADC |
| 英文描述： | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| 封装： | 7 X 7 MM, PLASTIC, MO-220-WKKD-2, QFN-48 |
| 文件页数： | 13/26页 |
| 文件大小： | 1118K |
| 代理商： | LTC2202I |
PREP
ARED
FOR
LTC2203/LTC2202
20
22032p
Figure 5 demonstrates the use of an LTC1994 differential
amplier to convert a single ended input signal into a
differential input signal. The advantage of this method is
that it provides low frequency input response; however,
the limited gain bandwidth of any op amp will limit the
SFDR at high input frequencies.
The 25Ω resistors and 12pF capacitor on the analog
inputs serve two purposes: isolating the drive circuitry
from the sample-and-hold charging glitches and limiting
the wideband noise at the converter input.
Reference Operation
Figure 6 shows the LTC2203/LTC2202 reference circuitry
consisting of a 2.5V bandgap reference, a programmable
gain amplier and control circuit. The LTC2203/LTC2202
has three modes of reference operation: Internal Refer-
ence, 1.25V external reference or 2.5V external reference.
To use the internal reference, tie the SENSE pin to VDD. To
use the external reference, simply apply either a 1.25V or
2.5V reference voltage to the SENSE input pin. Both 1.25V
and 2.5V applied to SNESE will result in a full scale range
of 2.5 Vp-p (PGA = 0). A 1.25V output, VCM, is provided
for a common mode bias for input drive circuitry. An
external bypass capacitor is required for the VCM output.
This provides a high frequency low impedance path to
ground for internal and external circuitry. This is also the
compensation capacitor for the reference; it will not be
stable without this capacitor. The minimum value required
for stability is 2.2F.
APPLICATIO S I FOR ATIO
W
U
The internal programmable gain amplier provides the
internal reference voltage for the ADC. This amplier has
very stringent settling requirements and is not accessible
for external use.
Figure 5. DC Coupled Input with Differential Amplier
VCM
LTC2203/02
22032 F05
–
+
CM
499
100pF
499
523
499
53.6
AIN+
AIN–
Figure 6. Reference Circuit
PGA
1.25V
SENSE
VCM
BUFFER
INTERNAL
ADC
REFERENCE
RANGE
SELECT
AND GAIN
CONTROL
2.5V
BANDGAP
REFERENCE
2.2
F
TIE TO VDD TO USE
INTERNAL 2.5V
REFERENCE
OR INPUT FOR
EXTERNAL 2.5V
REFERENCE
OR INPUT FOR
EXTERNAL 1.25V
REFERENCE
22032 F07
LTC2203/02
Figure 7. A 2.25V Range ADC with
an External 2.5V Reference
PGA Pin
The PGA pin selects between two gain settings for the ADC
front-end. PGA = 0 selects an input range of 2.5VP-P; PGA
= 1 selects an input range of 1.667VP-P. The 2.5V input
range has the best SNR; however, the distortion will be
VCM
SENSE
1.25V
3.3V
2.2
F
2.2
F
1
F
22032 F08
LTC2203/02
LTC1461-2.5
2
6
4
TheSENSEpincanbedriven±5%aroundthenominal2.5V
or 1.25V external reference input. This adjustment range
can be used to trim the ADC gain error or other system
gain errors. When selecting the internal reference, the
SENSE pin should be tied to VDD 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 at least a 1F ceramic capacitor.
相关PDF资料 |
PDF描述 |
|---|---|
| LTC2202I#PBF | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| LTC2202I#TR | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| LTC2203C#PBF | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| LTC2203I | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| LTC2202C | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC2202IUK | 制造商:Linear Technology 功能描述:ADC Single Pipelined 10Msps 16-bit Parallel 48-Pin QFN EP |
| LTC2202IUK#PBF | 功能描述:IC ADC 16-BIT 10MSPS 48-QFN 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:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| LTC2202IUK#TRPBF | 功能描述:IC ADC 16-BIT 10MSPS 48-QFN 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 |
| LTC2202UK | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Bit, 25Msps/10Msps ADCs |
| LTC2203 | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Bit, 25Msps/10Msps ADCs |
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