adl5243 Analog Devices, Inc., adl5243 Datasheet - Page 11

• Manufacturer Part Number: adl5243
• Manufacturer: Analog Devices, Inc.

Preliminary Datasheet
SPI TIMING SEQUENCE
Figure 19 is the timing sequence for the SPI function using a 6-bit operation. The clock can be as fast as 20MHz. In serial mode operation
register B5 (MSB) comes in first and register B0 (LSB) comes in last.
Table 4. Mode Selection Table
Pin SEL 1
Ground
Supply
Table 5. DSA Attenuation Truth Table – Serial Mode
Attenuation State
Table 6. DSA Attenuation Truth Table – Parallel Mode
Attenuation State
0 dB (reference)
0 dB (reference)
16.0 dB
31.5 dB
0.5 dB
1.0 dB
2.0 dB
4.0 dB
8.0 dB
16.0 dB
31.5 dB
0.5 dB
1.0 dB
2.0 dB
4.0 dB
8.0 dB
B5 (MSB)
D1 (MSB)
1
1
1
1
1
1
0
0
1
1
1
1
1
1
0
0
Functionality
Serial Mode
Parallel Mode
D1/DATA
D2/LE
D6
D0/CLK
MSB
B5
B4
1
1
1
1
1
0
1
0
D2
1
1
1
1
1
0
1
0
B4
Figure 19. SPI Timing Sequence
B3
B3
D3
1
1
1
1
0
1
1
0
1
1
1
1
0
1
1
0
B2
B1
B2
D4
1
1
1
0
1
1
1
0
LSB
1
1
1
0
1
1
1
0
B0
B1
D5
1
1
0
1
1
1
1
0
1
1
0
1
1
1
1
0
ADL5243
B0 (LSB)
D6 (LSB)
1
0
1
1
1
1
1
0
1
0
1
1
1
1
1
0