DDC316 Datasheet, PDF (15/24 Pages) Texas Instruments – 16-Channel, Current-Input Analog-to-Digital Converter

DDC316
www.ti.com .................................................................................................................................................................................................. SBAS370 – MARCH 2008
CONFIGURATION REGISTER
The DDC316 configuration shown in Table 4 is controlled by and configured with an on-chip, 16-bit configuration
register.
Table 4. Configuration Register
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
1
Bit 7
MODE
Bit 6
RES[1]
Bit 5
RES[0]
Bit 4
RANGE[1]
Bit 3
RANGE[0]
Bit 2
0
Bit 1
HI_SPEED
Bit 0
TM[1]
TM[0]
0
BUFDIS
0
0
0
0
The following section gives a brief description of the programmable bits and the method to program the bits. Note
that in the event of an external reset or a power-on reset, all the configuration bits are set to default values. The
bits need to be reprogrammed as needed after a reset.
Bit Descriptions
Bit 15
Bit 14
Unused bit. This bit must always be set to one.
During a power-up or reset event, this bit is set to zero and must be programmed to one.
MODE—Data Output Mode.
This bit selects between the parallel and serial data output (time division multiplexing, or TDM)
modes, as shown in Table 5.
MODE
0
1
Table 5. Data Output Mode
DATA OUTPUT MODE
Parallel, using DOUT1, DOUT2, DOUT3, and DOUT4
(default)
Serial, time division multiplexed (TDM) on DOUT1
Bits 13-12
RES[1:0]—Output Data resolution.
These bits set the output data resolution. The value of the output resolution is the same for
RES[1:0] = '10' and RES[1:0] = '11'.
Table 6. Output Data Resolution
RES[1:0]
00
01
10
11
OUTPUT RESOLUTION
16 Bits (default)
14 Bits
12 Bits
Bits 11-10
RANGE[1:0]—Full-Scale Input Range.
These range bits set the value of the integration capacitors that are used in the dual-switched
integrators. Table 7 shows the three different capacitor values available. The value of the
maximum input charge is the same for RANGE = '10' and RANGE = '11'.
Table 7. Full-Scale Range
RANGE[1:0]
00
01
10
11
MAXIMUM INPUT CHARGE
3pC (default)
6pC
12pC
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): DDC316
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