DDC118IRTCT Datasheet

IC型號：
DDC118IRTCT
PDF描述：
Octal Current Input 20-Bit Analog-To-Digital Converter
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DDC118

SBAS325A 鈭?JUNE 2004 鈭?REVISED JUNE 2005

Octal Current Input 20-Bit

Analog-To-Digital Converter

FEATURES

SINGLE-CHIP SOLUTION TO DIRECTLY

MEASURE EIGHT LOW-LEVEL CURRENTS

HIGH PRECISION, TRUE INTEGRATING

FUNCTION

INTEGRAL LINEARITY:

鹵0.01%

of Reading

鹵0.5ppm

of FSR

VERY LOW NOISE: 5.2ppm of FSR

LOW POWER: 13.5mW/channel

ADJUSTABLE DATA RATE: Up to 3.125kSPS

PROGRAMMABLE FULL SCALE

DAISY-CHAINABLE SERIAL INTERFACE

AVDD

VREF

DVDD

APPLICATIONS

CT SCANNER DAS

PHOTODIODE SENSORS

INFRARED PYROMETER

LIQUID/GAS CHROMATOGRAPHY

Protected by US Patent #5841310

DESCRIPTION

The DDC118 is a 20-bit octal channel, current-input

analog-to-digital (A/D) converter. It combines both

current-to-voltage and A/D conversion so that eight

low-level current output devices, such as photodiodes, can

be directly connected to its inputs and digitized.

For each of the eight inputs, the DDC118 provides a

dual-switched integrator front-end. This design allows for

continuous current integration: while one integrator is

being digitized by the onboard A/D converter, the other is

integrating the input current. Adjustable full-scale ranges

from 12pC to 350pC and adjustable integration times from

50碌s to 1s allow currents from fAs to

碌As

to be measured

with outstanding precision. Low-level linearity is

鹵0.5ppm

of the full-scale range and noise is 5.2ppm of the full-scale

range.

Two modes of operation are provided. In Low-Power

mode, total power dissipation is only 13.5mW per channel

with a maximum data rate of 2.5kSPS. High-Speed mode

supports data rates up to 3.125kSPS with a corresponding

dissipation of 18mW per channel.

The DDC118 has a serial interface designed for

daisy-chaining in multi-device systems. Simply connect

the output of one device to the input of the next to create

the chain. Common clocking feeds all the devices in the

chain so that the digital overhead in a multi-DDC118

system is minimal.

The DDC118 is a single-supply device using a +5V analog

supply and supporting a +2.7V to +5.25V digital supply.

Operating over the industrial temperature range of 鈭?0擄C

to 85擄C, the DDC118 is offered in a QFN-48 package.

CLK

IN1

Dual

Switched

Integrator

IN3

Dual

Switched

Integrator

鈭單?/div>

Modulator

CONV

RANGE0

Digital

Filter

RANGE1

Control

RANGE2

TEST

CLK_4X

HISPD/LOPWR

RESET

IN2

Dual

Switched

Integrator

IN4

Dual

Switched

Integrator

DCLK

鈭單?/div>

Modulator

Digital

Filter

FORMAT

DCLK

IN5

Dual

Switched

Integrator

IN7

Dual

Switched

Integrator

鈭單?/div>

Modulator

Digital

Input/Output

DVALID

Digital

Filter

DOUT

DIN

IN6

Dual

Switched

Integrator

IN8

Dual

Switched

Integrator

AGND

DGND

鈭單?/div>

Modulator

DIN

Digital

Filter

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.

錚?/div>

2002鈭?005, Texas Instruments Incorporated

www.ti.com

產(chǎn)品培訓模塊
Data Converter Basics
視頻文件
Nuts and Bolts of the Delta-Sigma Converter
標準包裝
1
類別
集成電路 (IC)
家庭
數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器
系列
-
位數(shù)
20
采樣率（每秒）
3.13k
數(shù)據(jù)接口
串行
轉(zhuǎn)換器數(shù)目
4
功率耗散（最大）
200mW
電壓電源
模擬和數(shù)字
工作溫度
-40°C ~ 85°C
安裝類型
表面貼裝
封裝/外殼
48-VFQFN 裸露焊盤
供應商設備封裝
48-VQFN（7x7）
包裝
Digi-Reel®
輸入數(shù)目和類型
8 個單端，單極
其它名稱
296-18258-6

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