Datasheet
www.ti.com
16 x M
MSB LSB LSBMSB
SCLK
SEN
SDATA
t
SLOADS
t
SLOADH
t
SCLK
t
WSCLK
t
WSCLK
t
su(D)
t
h(D)
V
DFS
t
2
12
AV
DD
4
12
AV
DD
t V
DFS
t
5
12
AV
DD
7
12
AV
DD
t V
DFS
t
8
12
AV
DD
V
DFS
u
10
12
AV
DD
ADS5542
SBAS308D – MAY 2004 – REVISED FEBRUARY 2007
Figure 4. Serial Programming Interface Timing Diagram
Table 1. Serial Programming Interface Timing Characteristics
SYMBOL PARAMETER MIN
(1)
TYP
(1)
MAX
(1)
UNIT
t
SCLK
SCLK period 50 ns
t
WSCLK
SCLK duty cycle 25% 50% 75%
t
SLOADS
SEN to SCLK setup time 8 ns
t
SLOADH
SCLK to SEN hold time 6 ns
t
DS
Data setup time 8 ns
t
DH
Data hold time 6 ns
(1) Min, typ, and max values are characterized, but not production tested.
Table 2. Serial Register Table
(1)
A3 A2 A1 A0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 DESCRIPTION
TP<1> TP<0> Test Mode
1 1 1 0 0 0 0 0 0 0 0 0 0 0 X 0 Normal mode of operation
1 1 1 0 0 0 1 0 0 0 0 0 0 0 X 0 All outputs forced to 0
1 1 1 0 0 1 0 0 0 0 0 0 0 0 X 0 All outputs forced to 1
1 1 1 0 0 1 1 0 0 0 0 0 0 0 X 0 Each output bit toggles between 0 and 1.
(2) (3)
PDN Power Down
1 1 1 1 0 0 0 0 0 0 0 0 0 0 X 0 Normal mode of operation
1 1 1 1 1 0 0 0 0 0 0 0 0 0 X 0 Device is put in power-down (low-current) mode.
(1) The register contents default to the appropriate setting for normal operation up on RESET.
(2) The patterns given are applicable to the straight offset binary output format. If two's complement output format is selected, the test mode
outputs will be the binary two's complement equivalent of these patterns as described in the Output Information section.
(3) While each bit toggles between 1 and 0 in this mode, there is no assured phase relationship between the data bits D0 through D13. For
example, when D0 is a 1, D1 in not assured to be a 0, and vice versa.
Table 3. Data Format Select (DFS) Table
DFS-PIN VOLTAGE (V
DFS
) DATA FORMAT CLOCK OUTPUT POLARITY
Straight Binary Data valid on rising edge
Two's Complement Data valid on rising edge
Straight Binary Data valid on falling edge
Two's Complement Data valid on falling edge
8
Submit Documentation Feedback