THS1207 Datasheet, PDF (18/33 Pages) Texas Instruments – 12 bit 4 ANALOG INPUT 6 MSPS SIMULTANEOUS SAMPLING

THS1207
SLAS284A – AUGUST 2000 – REVISED DECEMBER 2002
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ADC CONTROL REGISTER
The THS1207 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 6.
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
RESERVED
BIT 4
CHSEL1
RESERVED
BIT 3
CHSEL0
RESERVED
BIT 2
PD
RESERVED
BIT 1
RESERVED
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 7 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
Start
Use Default
No
Values?
Yes
Write 0x401 to
THS1207
(Set Reset Bit in CR1)
Clear RESET By
Writing 0x400 to
CR1
Write 0x401 to
THS1207
(Set Reset Bit in CR1)
Clear RESET By
Writing 0x400 to CR1
Write the User
Configuration to CR0
Write the User
Configuration to CR1
(Must Exclude RESET)
Continue
Figure 30. THS1207 Configuration Flow
18