DDC316 Datasheet, PDF (9/24 Pages) Texas Instruments – 16-Channel, Current-Input Analog-to-Digital Converter

DDC316
www.ti.com .................................................................................................................................................................................................. SBAS370 – MARCH 2008
THEORY OF OPERATION
GENERAL DESCRIPTION
The DDC316 contains 16 identical input channels that
perform the function of current-to-voltage integration,
followed by a multiplexed A/D conversion. Integration
time is directly controlled via the CONV pin. Each
input uses a dual-switched integrator so that the
current-to-voltage integration can be continuous over
time. The 16 integrators from one side of the inputs
are digitized, while the other 16 are integrating to
achieve continuous charge collection. The results
from are stored in a serial output shift register. The
DVALID output goes low when the shift register
contains valid data. A block diagram of the DDC316
is shown in Figure 4.
AVDD
VREF VREF_IN DVDD
IN1
IN2
IN3
IN4
IN13
IN14
IN15
IN16
Dual
Switched
Integrator
Dual
Switched
Integrator
ADC 1
Configuration
and
Control
CLK
CONV
DIN_CFG
RESET
Dual
Switched
Integrator
Dual
Switched
Integrator
Dual
Switched
Integrator
Dual
Switched
Integrator
Dual
Switched
Integrator
ADC 4
Digital
Input/Output
DVALID
DIN
DCLK
DOUT1
DOUT2
DOUT3
DOUT4
Dual
Switched
Integrator
AGND
DGND
Figure 4. DDC316 Block Diagram
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): DDC316
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