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DDC114 Datasheet

  • DDC114

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

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DDC114
SBAS255A 鈭?JUNE 2004 鈭?REVISED NOVEMBER 2004
Quad Current Input 20-Bit
ANALOG-TO-DIGITAL CONVERTER
FEATURES
D
D
D
D
D
D
D
D
D
D
D
D
SINGLE-CHIP SOLUTION TO DIRECTLY
MEASURE FOUR 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
DESCRIPTION
The DDC114 is a 20-bit quad channel, current-input
analog-to-digital (A/D) converter. It combines both
current-to-voltage and A/D conversion so that four
low-level current output devices, such as photodiodes, can
be directly connected to its inputs and digitized.
For each of the four inputs, the DDC114 provides a
dual-switched integrator front-end. This 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A(chǔ)s
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. The High-Speed
mode supports data rates up to 3.125kSPS with a
corresponding dissipation of 18mW per channel.
CLK
APPLICATIONS
CT SCANNER DAS
PHOTODIODE SENSORS
INFRARED PYROMETER
LIQUID/GAS CHROMATOGRAPHY
Protected by US Patent #5841310
AVDD
VREF
DVDD
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
FORMAT
DCLK
The DDC114 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-DDC114
system is minimal.
The DDC114 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 DDC114 is offered in a QFN-48 package.
IN2
DCLK
Dual
Switched
Integrator
IN4
Dual
Switched
Integrator
AGND
DGND
鈭單?/div>
Modulator
Digital
Filter
Digital
Input/Output
DVALID
DOUT
DOUT
DIN
DIN
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.
Copyright
錚?/div>
2004, Texas Instruments Incorporated
www.ti.com

DDC114相關(guān)型號(hào)PDF文件下載

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