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參數(shù)資料
| 型號： | DDC101U |
| 英文描述： | Analog-to-Digital Converter， 20-Bit |
| 中文描述： | 模擬到數(shù)字轉(zhuǎn)換器，20位 |
| 文件頁數(shù)： | 1/28頁 |
| 文件大?。?/td> | 237K |
| 代理商： | DDC101U |
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20-BIT ANALOG-TO-DIGITAL CONVERTER
DDC101
DESCRIPTION
The DDC101 is a precision, wide dynamic range, charge
digitizing A/D converter with 20-bit resolution. Low
level current output devices, such as photosensors, can be
directly connected to its input. The most stringent accu-
racy requirements of many unipolar output sensor appli-
cations occur at low signal levels. To meet this require-
ment, Burr-Brown developed the adaptive delta modula-
tion architecture of the DDC101 to provide linearly
improving noise and linearity errors as the input signal
level decreases. The DDC101 combines the functions of
current-to-voltage conversion, integration, input program-
mable gain amplification, A/D conversion, and digital
filtering to produce precision, wide dynamic range re-
sults. The input signal can be a low level current con-
nected directly into the unit or a voltage connected
through a user selected resistor. Although the DDC101 is
optimized for unipolar signals, it can also accurately
digitize bipolar input signals. The patented delta modula-
tion topology combines charge integration and digitiza-
tion functions. Oversampling and digital filtering reduce
system noise dramatically. Correlated Double Sampling
(CDS) captures and eliminates steady state and conver-
sion cycle dependent offset and switching errors that are
not eliminated with conventional analog circuits.
The DDC101 block diagram is shown below. During
conversion, the input signal is collected on the internal
integration capacitance for a user determined integration
period. A high precision, autozeroed comparator samples
the analog input node. Tracking logic updates the internal
high resolution D/A converter at a 2MHz rate to maintain
the analog input at virtual ground. A user programmable
digital filter oversamples the tracking logic’s output. The
digital filter passes a low noise, high resolution digital
output to the serial I/O register. The serial outputs of
multiple DDC101 units can be easily connected together
in series or parallel if desired to minimize interconnections.
G
MONOLITHIC CHARGE INPUT ADC
G
DIGITAL FILTER NOISE REDUCTION:
0.9ppm, rms
G
DIGITAL ERROR CORRECTION: CDS
G
CONVERSION RATE: Up to 15kHz
G
USER FRIENDLY EVALUATION FIXTURE
APPLICATIONS
G
DIRECT PHOTOSENSOR DIGITIZATION
G
PRECISION INSTRUMENTATION
G
INFRARED PYROMETRY
G
PRECISION PROCESS CONTROL
G
CT SCANNER DAS
G
CHEMICAL ANALYZERS
FEATURES
C
INT
Digital Integration,
Tracking and
Control Logic
Digital Filter and
Error Correction
Serial I/O
Register
Serial In
Serial Out
Reset
DAC
CDAC
DDC101 Integrated Circuit
Comparator
V
REF
Analog
Input
Ground
Setup
Oversampled
Digital Out
18 Bits
20 Bits
Test In
+V
S
Test Current
1993 Burr-Brown Corporation
PDS-1211E
Printed in U.S.A. March, 1998
International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111
Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
DDC101
SBAS029
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| DDC114 | Quad Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DDC101UG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 20-Bit Anlg-to-Dig Converter RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| DDC1021 | 制造商:MPSIND 制造商全稱:MPS Industries, Inc. 功能描述:3W, Wide Input Range SMD, Single & Dual Output DC/DC Converters |
| DDC1022 | 制造商:MPSIND 制造商全稱:MPS Industries, Inc. 功能描述:3W, Wide Input Range SMD, Single & Dual Output DC/DC Converters |
| DDC1023 | 制造商:MPSIND 制造商全稱:MPS Industries, Inc. 功能描述:3W, Wide Input Range SMD, Single & Dual Output DC/DC Converters |
| DDC1024 | 制造商:MPSIND 制造商全稱:MPS Industries, Inc. 功能描述:3W, Wide Input Range SMD, Single & Dual Output DC/DC Converters |
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