Datasheet > DDC118

DDC118

更新时间： 2024-10-28 02:58:15

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
34页	1146K
描述
32-Channel, Current-Input Analog-to-Digital Converter

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DDC118 数据手册

DDC112

SBAS085B – JANUARY 2000 – REVISED OCTOBER 2004

Dual Current Input 20-Bit

ANALOG-TO-DIGITAL CONVERTER

FEATURES

DESCRIPTION

ꢀ MONOLITHIC CHARGE MEASUREMENT A/D

The DDC112 is a dual input, wide dynamic range, charge-

digitizing analog-to-digital (A/D) converter with 20-bit resolu-

tion. Low-level current output devices, such as photosensors,

can be directly connected to its inputs. Charge integration is

continuous as each input uses two integrators; while one is

being digitized, the other is integrating.

CONVERTER

ꢀ DIGITAL FILTER NOISE REDUCTION:

3.2ppm, rms

ꢀ INTEGRAL LINEARITY:

±0.005% Reading ±0.5ppm FSR

For each of its two inputs, the DDC112 combines current-to-

voltage conversion, continuous integration, programmable

full-scale range, A/D conversion, and digital filtering to achieve

a precision, wide dynamic range digital result. In addition to

the internal programmable full-scale ranges, external integrat-

ing capacitors allow an additional user-settable full-scale

range of up to 1000pC.

ꢀ HIGH PRECISION, TRUE INTEGRATING FUNC-

TION

ꢀ PROGRAMMABLE FULL-SCALE

ꢀ SINGLE SUPPLY

ꢀ CASCADABLE OUTPUT

To provide single-supply operation, the internal A/D converter

APPLICATIONS

ꢀ DIRECT PHOTOSENSOR DIGITIZATION

utilizes a differential input, with the positive input tied to V_REF

When the integration capacitor is reset at the beginning of

each integration cycle, the capacitor charges to V_REF. This

charge is removed in proportion to the input current. At the

end of the integration cycle, the remaining voltage is com-

ꢀ CT SCANNER DAS

ꢀ INFRARED PYROMETER

ꢀ PRECISION PROCESS CONTROL

ꢀ LIQUID/GAS CHROMATOGRAPHY

ꢀ BLOOD ANALYSIS

pared to V_REF.

The high-speed serial shift register which holds the result of

the last conversion can be configured to allow multiple DDC112

units to be cascaded, minimizing interconnections. The

DDC112 is available in an SO-28 or TQFP-32 package and is

offered in two performance grades.

Protected by US Patent #5841310

AV_DD

AGND

V_REF

DV_DDDGND

CAP1A

CHANNEL 1

DCLK

IN1

Dual

Switched

Integrator

DVALID

CAP1B

∆Σ

Modulator

DXMIT

DOUT

DIN

Digital

Filter

Digital

Input/Output

CAP2A

CHANNEL 2

RANGE2

RANGE1

RANGE0

IN2

Control

Dual

Switched

Integrator

CAP2B

TEST

CLK

CONV

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

www.ti.com

12 3 4 5 6 7...34

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DDC118 替代型号

型号	品牌	替代类型	描述	数据表
DDC112	TI	功能相似	MONOLITHIC CHARGE MEASUREMENT A/D CONVERTER, DIGITAL FILTER NOISE REDUCTION: 3.2ppm, rms
DDC316	TI	功能相似	16-Channel, Current-Input Analog-to-Digital Converter
DDC232	TI	功能相似	32-Channel, Current-Input Analog-to-Digital Converter

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DDC1205S	CRANE	获取价格	Analog Circuit, Hybrid, PDIP24,
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