THS1209 Datasheet, PDF (18/33 Pages) Texas Instruments – 12-BIT, 2 ANALOG INPUT, 8MSPS, SIMULTANEOUS SAMPLING ANALOG-TO-DIGITAL CONVERTER

THS1209
SLAS288B – JULY 2000 – REVISED DECEMBER 2002
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ADC CONTROL REGISTER
The THS1209 contains two 10-bit wide control registers (CR0, CR1) in order to program the device into the desired
mode. The bit definitions of both control registers are shown in Table 7.
Table 6. Bit Definitions of Control Register CR0 and CR1
REG
CR0
CR1
BIT 9
TEST1
RBACK
BIT 8
TEST0
OFFSET
BIT 7
SCAN
BIN/2’s
BIT 6
DIFF1
R/W
BIT 5
DIFF0
RES
BIT 4
CHSEL1
RES
BIT 3
CHSEL0
RES
BIT 2
PD
RES
BIT 1
RES
SRST
BIT 0
VREF
RESET
Writing to Control Register 0 and Control Register 1
The 10-bit wide control register 0 and control register 1 can be programmed by addressing the desired control
register and writing the register value to the ADC. The addressing is performed with the upper data bits D10 and D11,
which function in this case as address lines RA0 and RA1. During this write process, the data bits D0 to D9 contain
the desired control register value. Table 8 shows the addressing of each control register.
Table 7. Control Register Addressing
D0 – D9
Desired register value
Desired register value
Desired register value
Desired register value
D10/RA0
0
1
0
1
D11/RA1
0
0
1
1
Addressed Control Register
Control register 0
Control register 1
Reserved for future
Reserved for future
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