DDC316_17 Datasheet, PDF (1/28 Pages) Texas Instruments – 16-Channel, Current-Input Analog-to-Digital Converter

DDC316
www.ti.com......................................................................................................................................................... SBAS370A – MARCH 2008 – REVISED APRIL 2009
16-Channel, Current-Input
Analog-to-Digital Converter
FEATURES
1
•2 SINGLE-CHIP SOLUTION TO MEASURE 16
LOW-LEVEL CURRENTS
• INTEGRATING I-TO-V CONVERSION
FRONT-END
• PROGRAMMABLE FULL-SCALE : 3pC to 12pC
• ADJUSTABLE SPEED:
– Data Rate Up To 100kSPS
– Integration Time Down To 10µs
• ANALOG SUPPLY: +5V
• DIGITAL SUPPLY: +3.3V
APPLICATIONS
• CT SCANNER DAS
• PHOTODIODE SENSORS
• X-RAY DETECTION SYSTEMS
Protected by US Patent #5841310
DESCRIPTION
The DDC316 is a 16-bit, 16-channel, current-input
analog-to-digital converter (ADC). It combines both
current-to-voltage and analog-to-digital (A/D)
conversion so that 16 separate low-level current
output devices (such as photodiodes) can be directly
connected to its inputs and digitized.
For each of the 16 inputs, the DDC316 provides a
dual-switched integrator front-end. This configuration
allows for continuous current integration: while one
integrator is being digitized by the on-chip ADC, the
other is integrating the input current. Adjustable
integration times range from 10µs to 1ms.
The DDC316 provides a serial interface of the output
data, either multiplexed onto a single data output pin
or parallel on four output pins. The output mode can
be selected based on the available integration time.
The DDC316 uses a +5V analog supply and a +3.3V
digital supply. Operating over the temperature range
of 0°C to +70°C, the DDC316 is offered in a BGA-64
package.
IN1
IN2
IN3
IN4
IN16
AVDD
VREF
I to V
I to V
I to V
I to V
ADCs
I to V
DVDD
DDC316
Control
CLK
CONV
DIN_CFG
RESET
Serial
Interface
DVALID
DIN
DCLK
DOUT1
DOUT2
DOUT3
DOUT4
AGND
DGND
1
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2009, Texas Instruments Incorporated