ADL5201-EVALZ AD [Analog Devices], ADL5201-EVALZ Datasheet - Page 16

• Manufacturer Part Number: ADL5201-EVALZ
• Description: Wide Dynamic Range, High Speed
• Manufacturer: AD [Analog Devices]

ADL5201
Truth Table
Table 7. Gain Code vs. Voltage Gain Lookup Table
6-Bit Binary
Gain Code
000000
000001
000010
000011
000100
000101
000110
000111
001000
001001
001010
001011
001100
001101
001110
001111
010000
010001
010010
010011
010100
010101
010110
010111
011000
011001
011010
011011
011100
011101
011110
011111
SCLK
SDIO
CS
t
t
DS
DS
DNC
Voltage
Gain (dB)
20
19.5
19
18.5
18
17.5
17
16.5
16
15.5
15
14.5
14
13.5
13
12.5
12
11.5
11
10.5
10
9.5
9
8.5
8
7.5
7
6.5
6
5.5
5
4.5
t
DH
DNC
DNC
6-Bit Binary
Gain Code
100000
100001
100010
100011
100100
100101
100110
100111
101000
101001
101010
101011
101100
101101
101110
101111
110000
110001
110010
110011
110100
110101
110110
110111
111000
111001
111010
111011
111100
111101
111110
111111
t
SCLK
DNC
DNC
Figure 51. SPI Interface Read/Write Mode Timing Diagram
DNC
Voltage
Gain (dB)
4
3.5
3
2.5
2
1.5
1
0.5
0
−0.5
−1
−1.5
−2
−2.5
−3
−3.5
−4
−4.5
−5
−5.5
−6
−6.5
−7
−7.5
−8
−8.5
−9
−9.5
−10
−10.5
−11
−11.5
DNC
t
Rev. 0 | Page 16 of 28
PW
R/W
FA1
LOGIC TIMING
To write to the ADL5201, refer to the timing shown in Figure 51.
The write mode uses a 16-bit serial word on the SDIO pin. The
R/W bit of the word must be low to write Bits[D5:D0], which are
the binary weighted codes for the attenuation level (0 = minimum
attenuation, 63 = maximum attenuation). The FA0 and FA1 bits
control the fast attack step size. The DNC bits are nonfunctional,
do not care bits.
Reading the ADL5201 SPI register requires the following two steps:
1.
2.
Set the R/W bit high using a 16-bit word and the timing
shown in Figure 51. All other bits are ignored when the
R/W bit is high.
The SDIO is used as an output during the next sequence.
The written pattern is serially clocked out on SDIO using
16 clocks and the timing shown in Figure 51. The R/W bit
automatically returns low to the write state following the
read sequence.
FA0
D5
D4
D3
D2
D1
Data Sheet
D0
t
DH