參數(shù)資料
型號(hào)： EVAL-ADG2108EBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 13/28頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR ADG2108
產(chǎn)品變化通告： Interface Change Notice 12/Apr/2010
標(biāo)準(zhǔn)包裝： 1
主要目的： 計(jì)時(shí)，頻率合成器
已用 IC / 零件： ADG2108
已供物品： 板
相關(guān)產(chǎn)品： ADG2108BCPZ-REEL7DKR-ND - IC CROSSPOINT SWIT 8X10 32LFCSP
ADG2108YCPZ-HS-RL7-ND - IC CROSSPOINT SWIT 8X10 32LFCSP
ADG2108BCPZ-HS-RL7TR-ND - IC CROSSPOINT SWIT 8X10 32LFCSP
ADG2108YCPZ-REEL7CT-ND - IC CROSSPOINT SWIT 8X10 32LFCSP
ADG2108BCPZ-REEL7CT-ND - IC CROSSPOINT SWIT 8X10 32LFCSP
ADG2108YCPZ-REEL7TR-ND - IC CROSSPOINT SWIT 8X10 32LFCSP
ADG2108BCPZ-REEL7TR-ND - IC CROSSPOINT SWIT 8X10 32LFCSP
ADG2108
Data Sheet
Rev. B | Page 20 of 28
WRITING TO THE ADG2108
INPUT SHIFT REGISTER
The input shift register is 24 bits wide. A 3-byte write is necessary when writing to this register and is done under the control of the serial
clock input, SCL. The contents of the three bytes of the input shift register are shown in Figure 33 and described in Table 6.
X
LDSW
DB0 (LSB)
DB7 (MSB)
DATA BITS
DATA AX3 AX2
AX1
AX0
AY2
AY1 AY0
DB8 (LSB)
DB15 (MSB)
DATA BITS
1
0
A2
A1
A0
R/W
DB16 (LSB)
DEVICE ADDRESS
DB23 (MSB)
05898-
004
Figure 33. Data-Words
Table 6. Input Shift Register Bit Function Descriptions
Bit
Mnemonic
Descriptions
DB23 to DB17
1110xxx
The MSBs of the ADG2108 are set to 1110. The LSBs of the address byte are set by the state of the
three address pins, Pin A0, Pin A1, and Pin A2.
DB16
R/W
Controls whether the ADG2108 slave device is read from or written to.
If R/W = 1, the ADG2108 is being read from.
If R/W = 0, the ADG2108 is being written to.
DB15
Data
Controls whether the switch is to be opened (off) or closed (on).
If Data = 0, the switch is opened/off.
If Data = 1, the switch is closed/on.
DB14 to DB11
AX3 to AX0
Controls I/Os X0 to X9. See Table 7 for the decode truth table.
DB10 to DB8
AY2 to AY0
Controls I/Os Y0 to Y7. See Table 7 for the decode truth table.
DB7 to DB1
X
Don’t care.
DB0
LDSW
This bit is useful when a number of switches need to be updated simultaneously.
If LDSW = 1, the switch position changes after the new word is read.
If LDSW = 0, the input data is latched, but the switch position is not changed.
As shown in Table 6, Bit DB14 to Bit DB11 control the X input/output lines, while Bit DB10 to Bit DB8 control the Y input/output lines.
Table 7 shows the truth table for these bits. Note that the full coding sequence is written out for Channel Y0, and Channel Y1 to Channel Y7
follow a similar pattern. Note also that the RESET pin must be high when writing to the device.
Table 7. Address Decode Truth Table
DB15
DATA
DB14
AX3
DB13
AX2
DB12
AX1
DB11
AX0
DB10
AY2
DB9
AY1
DB8
AY0
Switch Configuration
X
0
Reserved
X
0
1
0
Reserved
1
0
1
0
X0 to Y0 (on)
0
1
0
X0 to Y0 (off)
1
0
1
0
X1 to Y0 (on)
0
1
0
X1 to Y0 (off)
1
0
1
0
X2 to Y0 (on)
0
1
0
X2 to Y0 (off)
1
0
1
0
1
0
X3 to Y0 (on)
0
1
0
1
0
X3 to Y0 (off)
X
0
1
0
Reserved
X
0
1
0
Reserved
1
0
X4 to Y0 (on)
0
1
0
X4 to Y0 (off)
1
0
1
0
X5 to Y0 (on)
0
1
0
1
0
X5 to Y0 (off)
1
0
1
0
X6 to Y0 (on)
0
1
0
1
0
X6 to Y0 (off)
1
0
1
0
X7 to Y0 (on)
0
1
0
1
0
X7 to Y0 (off)
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