Datasheet

ADS4126 , ADS4129
ADS4146 , ADS4149
SBAS483G – NOVEMBER 2009–REVISED JANUARY 2011 www.ti.com
SERIAL REGISTER MAP
Table 10 summarizes the functions supported by the serial interface.
Table 10. Serial Interface Register Map
(1)
REGISTER DEFAULT VALUE
ADDRESS AFTER RESET REGISTER DATA
A[7:0] (Hex) D[7:0] (Hex) D7 D6 D5 D4 D3 D2 D1 D0
00 00 0 0 0 0 0 0 RESET READOUT
01 00 LVDS SWING 0 0
03 00 0 0 0 0 0 0 HIGH PERF MODE 1
DISABLE
25 00 GAIN TEST PATTERNS
GAIN
LVDS
LVDS DATA
26 00 0 0 0 0 0 0 CLKOUT
STRENGTH
STRENGTH
EN
3D 00 DATA FORMAT OFFSET 0 0 0 0 0
CORR
3F 00 CUSTOM PATTERN HIGH D[13:6]
40 00 CUSTOM PATTERN D[5:0] 0 0
EN EN
CMOS CLKOUT
41 00 LVDS CMOS CLKOUT CLKOUT RISE POSN CLKOUT
STRENGTH
RISE FALL
DIS LOW
42 00 CLKOUT FALL POSN 0 0 STBY 0 0
LATENCY
PDN
43 00 0 0 PDN OBUF 0 0 EN LVDS SWING
GLOBAL
HIGH PERF
4A 00 0 0 0 0 0 0 0
MODE 2
BF 00 OFFSET PEDESTAL 0 0
FREEZE
CF 00 OFFSET 0 OFFSET CORR TIME CONSTANT 0 0
CORR
DF 00 0 0 LOW SPEED 0 0 0 0
(1) Multiple functions in a register can be programmed in a single write operation.
DESCRIPTION OF SERIAL REGISTERS
For best performance, two special mode register bits must be enabled: HI PERF MODE 1 and HI PERF MODE
2.
Register Address 00h (Default = 00h)
7 6 5 4 3 2 1 0
0 0 0 0 0 0 RESET READOUT
Bits[7:2] Always write '0'
Bit 1 RESET: Software reset applied
This bit resets all internal registers to the default values and self-clears to 0 (default = 1).
Bit 0 READOUT: Serial readout
This bit sets the serial readout of the registers.
0 = Serial readout of registers disabled; the OVR_SDOUT pin functions as an over-voltage
indicator.
1 = Serial readout enabled; the OVR_SDOUT pin functions as a serial data readout.
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