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參數資料
| 型號： | THS1206IDAR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 4-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO32 |
| 封裝： | GREEN, PLASTIC, TSSOP-32 |
| 文件頁數： | 18/43頁 |
| 文件大?。?/td> | 722K |
| 代理商： | THS1206IDAR |
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THS1206
SLAS217H – MAY 1999 – REVISED JULY 2003#
www.ti.com
25
ADC CONTROL REGISTERS
Control Register 0 (see Table 8)
BIT 11
BIT 10
BIT 9
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
0
TEST1
TEST0
SCAN
DIFF1
DIFF0
CHSEL1
CHSEL0
PD
MODE
VREF
Table 9. Control Register 0 Bit Functions
BITS
RESET
VALUE
NAME
FUNCTION
0
VREF
Vref select:
Bit 0 = 0
→ The internal reference is selected
Bit 0 = 1
→ The external reference voltage is selected
1
0
MODE
Continuous conversion mode/single conversion mode
Bit 1 = 0
→ Continuous conversion mode is selected
An external clock signal is applied to the CONV_CLK input in this mode. With every falling edge of the
CONV_CLK signal a new converted value is written into the FIFO.
Bit 1 = 1
→ Single conversion mode is selected
In this mode, the CONV_CLK input functions as a CONVST input. A single conversion is initiated on the
THS1206 by pulsing the CONVST input. On the falling edge of CONVST, the sample and hold stages of the
selected analog inputs are placed into hold simultaneously, and the conversion sequence for the selected
channels is started. The signal DATA_AV (data available) becomes active when the trigger condition is
satisfied.
2
0
PD
Power down.
Bit 2 = 0
→ The ADC is active
Bit 2 = 1
→ Power down
The reading and writing to and from the digital outputs is possible during power down. It is also possible to
read out the FIFO.
3, 4
0,0
CHSEL0,
CHSEL1
Channel select
Bit 3 and bit 4 select the analog input channel of the ADC. Refer to Table 10.
5,6
1,0
DIFF0, DIFF1
Number of differential channels
Bit 5 and bit 6 contain information about the number of selected differential channels. Refer to Table 10.
7
0
SCAN
Autoscan enable
Bit 7 enables or disables the autoscan function of the ADC. Refer to Table 10.
8,9
0,0
TEST0,
TEST1
Test input enable
Bit 8 and bit 9 control the test function of the ADC. Three different test voltages can be measured. This
feedback allows the check of all hardware connections and the ADC operation.
Refer to Table 11 for selection of the three different test voltages. The control signal DATA_AV is disabled in
the test mode. Test voltage readings have to be done independent from DATA_AV. To get the THS1206 back
to the normal operating mode, apply the the initialization routine.
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