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DDC112U Datasheet

  • DDC112U

  • Dual Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTER

  • 24頁(yè)

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廬
DDC112
112
DDC
For most current data sheet and other product
information, visit www.burr-brown.com
Dual Current Input 20-Bit
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q
MONOLITHIC CHARGE MEASUREMENT ADC
q
DIGITAL FILTER NOISE REDUCTION:
3.2ppm, rms
q
INTEGRAL LINEARITY:
鹵
0.005% Reading
鹵
0.5ppm FSR
q
HIGH PRECISION, TRUE INTEGRATING
FUNCTION
q
PROGRAMMABLE FULL SCALE
q
SINGLE SUPPLY
q
CASCADABLE OUTPUT
DESCRIPTION
The DDC112 is a dual input, wide dynamic range,
charge-digitizing analog-to-digital converter (ADC) with
20-bit resolution. 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.
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 program-
mable full-scale ranges, external integrating capacitors
allow an additional user-settable full-scale range of up
to 1000pC.
To provide single-supply operation, the internal ADC
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 compared 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 a SO-28
package and is offered in two performance grades.
V
REF
DV
DD
DGND
APPLICATIONS
q
q
q
q
q
q
DIRECT PHOTOSENSOR DIGITIZATION
CT SCANNER DAS
INFRARED PYROMETER
PRECISION PROCESS CONTROL
LIQUID/GAS CHROMATOGRAPHY
BLOOD ANALYSIS
Protected by US Patent #5841310
AV
DD
CAP1A
CAP1A
IN1
CAP1B
CAP1B
CAP2A
CAP2A
IN2
CAP2B
CAP2B
Dual
Switched
Integrator
Dual
Switched
Integrator
AGND
CHANNEL 1
DCLK
DVALID
DXMIT
DOUT
DIN
RANGE2
RANGE1
RANGE0
鈭單?/div>
Modulator
Digital
Filter
Digital
Input/Output
CHANNEL 2
Control
TEST
CONV
CLK
International Airport Industrial Park 鈥?Mailing Address: PO Box 11400, Tucson, AZ 85734 鈥?Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 鈥?Tel: (520) 746-1111
Twx: 910-952-1111 鈥?Internet: http://www.burr-brown.com/ 鈥?Cable: BBRCORP 鈥?Telex: 066-6491 鈥?FAX: (520) 889-1510 鈥?Immediate Product Info: (800) 548-6132
廬
漏
1997 Burr-Brown Corporation
PDS-1421D
1
Printed in U.S.A. January, 2000
DDC112

DDC112U 產(chǎn)品屬性

  • Data Converter Basics

  • Nuts and Bolts of the Delta-Sigma Converter

  • 20

  • 集成電路 (IC)

  • 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器

  • -

  • 20

  • 3k

  • 串行

  • 1

  • 100mW

  • 模擬和數(shù)字

  • -40°C ~ 85°C

  • 表面貼裝

  • 28-SOIC（0.295"，7.50mm 寬）

  • 28-SOIC

  • 管件

  • 2 個(gè)單端，單極

  • 296-30896-ND - KIT EVAL PERFORMANCE DEMO DDC11X

DDC112U相關(guān)型號(hào)PDF文件下載

  • 型號(hào)
    版本
    描述
    廠商
    下載
  • 英文版
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    BB
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  • 英文版
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  • 英文版
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  • 英文版
    Converter IC
  • 英文版
    Dual Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTER
    BB
  • 英文版
    20 Bit Analog to Digital Converter 2 Input 1 Sigma-Delta 28-...
  • 英文版
    Dual Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTER
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  • 英文版
    NPN PRE-BIASED SMALL SIGNAL SOT-363 DUAL SURFACE MOUNT TRANS...
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