DC1012A-C (Linear) PDF资料下载 Datasheet(13/34 页)

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参数资料

型号：	DC1012A-C
厂商：	Linear Technology
文件页数：	13/34页
文件大小：	0K
描述：	BOARD DELTA SIGMA ADC LTC2495
软件下载：	QuikEval System
设计资源：	DC1012A Schematic DC1012A Design File
标准包装：	1
系列：	Easy Drive™, QuikEval™
ADC 的数量：	1
位数：	16
采样率（每秒）：	15
数据接口：	I²C，串行
已用 IC / 零件：	LTC2495
已供物品：	板
相关产品：	LTC2495IUHF#TRPBF-ND - IC ADC 16BIT W/PGA 38-QFN LTC2495CUHF#TRPBF-ND - IC ADC 16BIT W/PGA 38-QFN LTC2495CUHF#PBF-ND - IC ADC 16BIT W/PGA 38-QFN LTC2495IUHF#PBF-ND - IC ADC 16BIT W/PGA 38-QFN

LTC2495

2495fd

Rejection Mode (FA, FB)

The LTC2495 includes a high accuracy on-chip oscillator

with no required external components. Coupled with an

integrated fourth-order digital lowpass filter, the LTC2495

rejects line frequency noise. In the default mode, the

LTC2495 simultaneously rejects 50Hz and 60Hz by at least

87dB. If more rejection is required, the LTC2495 can be

configured to reject 50Hz or 60Hz to better than 110dB.

Speed Mode (SPD)

Every conversion cycle, two conversions are combined

to remove the offset (default mode). This result is free

from offset and drift. In applications where the offset is

not critical, the auto-calibration feature can be disabled

with the benefit of twice the output rate.

While operating in the 2x mode (SPD = 1), the linearity

and full-scale errors are unchanged from the 1x mode

performance. In both the 1x and 2x mode there is no

latency. This enables input steps or multiplexer changes

to settle in a single conversion cycle, easing system over-

head and increasing the effective conversion rate. During

temperature measurements, the 1x mode is always used

independent of the value of SPD.

GAIN (GS2, GS1, GS0)

The input referred gain of the LTC2495 is adjustable

from 1 to 256 (see Tables 5a and 5b). With a gain of 1,

the differential input range is ±VREF/2 and the common

mode input range is rail-to-rail. As the gain is increased,

the differential input range is reduced to ±0.5 VREF/Gain

but the common mode input range remains rail-to-rail.

As the differential gain is increased, low level voltages

are digitized with greater resolution. At a gain of 256, the

LTC2495 digitizes an input signal range of ±9.76mV with

over 16,000 counts.

Temperature Sensor

The LTC2495 includes an integrated temperature sensor.

The temperature sensor is selected by setting IM = 1.

During temperature readings, MUXOUTN/MUXOUTP

remains connected to the selected input channel. The

ADC internally connects to the temperature sensor and

performs a conversion.

The digital output is proportional to the absolute tem-

perature of the device. This feature allows the converter

to perform cold junction compensation for external

thermocouples or continuously remove the temperature

effects of external sensors.

applications inForMation

Table 5a. Performance vs Gain in Normal Speed Mode (VCC = 5V, VREF = 5V)

GAIN

128

256

UNIT

Input Span

±2.5

±0.625

±0.312

±0.156

±78m

±39m

±19.5m

±9.76m

LSB

38.1

9.54

4.77

2.38

1.19

0.596

0.298

0.149

Noise Free Resolution*

65536

32768

16384

Counts

Gain Error

ppm of FS

Offset Error

0.5

Table 5b. Performance vs Gain in 2x Speed Mode (VCC = 5V, VREF = 5V)