Rainbow Electronics MAX2063 - Manual (Page 16)

MAX2063
Dual 50MHz to 1000MHz High-Linearity,
Serial/Parallel-Controlled Digital VGA
16
1st Digital Attenuator Programming
D0:D7 Reserved. Set to logic 0.
D8:D12 Preprogrammed Attenuation State 1
D8 = 1dB bit, D9 = 2dB bit, D10 = 4dB bit,
D11 = 8dB bit, D12 = 16dB bit
D13:D17 Preprogrammed Attenuation State 2
D13 = 1dB bit, D14 = 2dB bit, D15 = 4dB bit,
D16 = 8dB bit, D17 = 16dB bit
D18:D22 Preprogrammed Attenuation State 3
D18 = 1dB bit, D19 = 2dB bit, D20 = 4dB bit,
D21 = 8dB bit, D22 = 16dB bit
D23:D27 Preprogrammed Attenuation State 4
D23 = 1dB bit, D24 = 2dB bit, D25 = 4dB bit,
D26 = 8dB bit, D27 = 16dB bit
2nd Digital Attenuator Programming
D28:D35 Reserved. Set to logic 0.
D36:D40 Preprogrammed Attenuation State 1
D36 = 1dB bit, D37 = 2dB bit, D38 = 4dB bit,
D39 = 8dB bit, D40 = 16dB bit
D41:D45 Preprogrammed Attenuation State 2
D41 = 1dB bit, D42 = 2dB bit, D43 = 4dB bit,
D44 = 8dB bit, D45 = 16dB bit
D46:D50 Preprogrammed Attenuation State 3
D46 = 1dB bit, D47 = 2dB bit, D48 = 4dB bit,
D49 = 8dB bit, D50 = 16dB bit
D51:D55 Preprogrammed Attenuation State 4
D51 = 1dB bit, D52 = 2dB bit, D53 = 4dB bit,
D54 = 8dB bit, D55 = 16dB bit
Figure 1. SPI Timing Diagram
t CS
MSB LSB
DN D1 D0 D(N-1)
t CH
t CW
t ES
t EW
t EWS
DATA
CLOCK
CS
DATA ENTERED ON CLOCK RISING EDGE.
ATTENUATOR REGISTER STATE CHANGE ON CS RISING EDGE.
N = NUMBER OF DATA BITS. NOTES: