Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- DESCRIPTION
- ABSOLUTE MAXIMUM RATINGSsecond and third footnotes to Absolute Maximum Ratings table.
- RECOMMENDED OPERATING CONDITIONS
- ELECTRICAL CHARACTERISTICS
- DIGITAL CHARACTERISTICS
- TIMING CHARACTERISTICSrows 5 through 15, and footnotes 5 and 6 to Timing Characteristics table.
- RESET TIMING CHARACTERISTICS
- SERIAL PROGRAMMING INTERFACE CHARACTERISTICS
- PIN CONFIGURATION
- DEFINITION OF SPECIFICATIONSthe Definition of Specifications section.
- TYPICAL CHARACTERISTICS
- TYPICAL CHARACTERISTICS
- APPLICATION INFORMATIONInput Voltage Stress section in Applications Information.

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SERIAL PROGRAMMING INTERFACE CHARACTERISTICS
A3
ADDRESS
SDATA
MSB
DATA
A2 A1 A0 D11 D10 D9 D0
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)
Production Data
ADS5541
SBAS307C – MAY 2004 – REVISED FEBRUARY 2007
The ADS5541 has a three-wire serial interface. The device latches the serial data SDATA on the falling edge of
serial clock SCLK when SEN is active.
• Serial shift of bits is enabled when SEN is low. SCLK shifts serial data at the falling edge.
• Minimum width of data stream for a valid loading is 16 clocks.
• Data is loaded at every 16th SCLK falling edge while SEN is low.
• In case the word length exceeds a multiple of 16 bits, the excess bits are ignored.
• Data can be loaded in multiples of 16-bit words within a single active SEN pulse.
• The first 4-bit nibble is the address of the register while the last 12 bits are the register contents.
Figure 3. DATA Communication is 2-Byte, MSB First
Figure 4. Serial Programming Interface Timing Diagram
Table 1. Serial Programming Interface Timing Characteristics
ADS5541
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
SY(D)
Data setup time 8 ns
t
H(D)
Data hold time 6 ns
(1) Values are characterized, but not production tested.
8
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