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參數資料
| 型號： | DDC112U |
| 英文描述： | Dual Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 雙路電流輸入20位模擬數字轉換器 |
| 文件頁數： | 1/24頁 |
| 文件大小： | 210K |
| 代理商： | DDC112U |
Printed in U.S.A. January, 2000
DDC112
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/ Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
DDC112
Dual Current Input 20-Bit
ANALOG-TO-DIGITAL CONVERTER
FEATURES
G
MONOLITHIC CHARGE MEASUREMENT ADC
G
DIGITAL FILTER NOISE REDUCTION:
3.2ppm, rms
G
INTEGRAL LINEARITY:
±
0.005% Reading
±
0.5ppm FSR
G
HIGH PRECISION, TRUE INTEGRATING
FUNCTION
G
PROGRAMMABLE FULL SCALE
G
SINGLE SUPPLY
G
CASCADABLE OUTPUT
APPLICATIONS
G
DIRECT PHOTOSENSOR DIGITIZATION
G
CT SCANNER DAS
G
INFRARED PYROMETER
G
PRECISION PROCESS CONTROL
G
LIQUID/GAS CHROMATOGRAPHY
G
BLOOD ANALYSIS
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.
Protected by US Patent #5841310
Dual
Switched
Integrator
Dual
Switched
Integrator
Σ
Modulator
Digital
Filter
Control
Digital
Input/Output
DVALID
DXMIT
DOUT
DIN
DCLK
RANGE2
RANGE1
RANGE0
TEST
CONV
CLK
CAP1A
CAP1A
CAP1B
CAP1B
CAP2A
CAP2A
CAP2B
CAP2B
IN2
IN1
V
REF
DGND
DV
DD
AGND
AV
DD
CHANNEL 1
CHANNEL 2
1997 Burr-Brown Corporation
PDS-1421D
For most current data sheet and other product
information, visit www.burr-brown.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| DDC112U | 制造商:Texas Instruments 功能描述:20BIT ADC DUAL 3KHZ SOIC28 112 制造商:Texas Instruments 功能描述:20BIT ADC, DUAL, 3KHZ, SOIC28, 112 制造商:Texas Instruments 功能描述:20BIT ADC, DUAL, 3KHZ, SOIC28, 112; Resolution (Bits):20bit; Sampling Rate:3kSPS; Supply Voltage Type:Single; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Supply Current:14.8mA; Digital IC Case Style:SOIC; No. of Pins:28; ;RoHS Compliant: Yes |
| DDC112U | 制造商:Texas Instruments 功能描述:20BIT ADC DUAL SMD SOIC28 112 |
| DDC112U | 制造商:Texas Instruments 功能描述:DUAL CURRENT INPUT 20 BIT ANALOG/DIGITAL |
| DDC112U/1K | 功能描述:模數轉換器 - ADC Dual Current Input 20-Bit RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| DDC112U/1KG4 | 功能描述:模數轉換器 - ADC Dual Current Input 20-Bit RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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