参数资料
型号: AD9251BCPZ-20
厂商: Analog Devices Inc
文件页数: 27/36页
文件大小: 0K
描述: IC ADC 14BIT 20MSPS 64LFCSP
标准包装: 1
位数: 14
采样率(每秒): 20M
数据接口: 串行,SPI?
转换器数目: 2
功率耗散(最大): 77mW
电压电源: 模拟和数字
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-VFQFN 裸露焊盘,CSP
供应商设备封装: 64-LFCSP-VQ(9x9)
包装: 托盘
输入数目和类型: 4 个单端,单极;2 个差分,单极
AD9251
Rev. A | Page 33 of 36
Address
(Hex)
Register
Name
Bit 7
(MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSB)
Default
Value
(Hex)
Comments
0x0D
Test mode (local)
User test mode
(local)
00 = single
01 = alternate
10 = single once
11 = alternate
once
Reset PN
long gen
Reset PN
short
gen
Output test mode [3:0] (local)
0000 = off (default)
0001 = midscale short
0010 = positive FS
0011 = negative FS
0100 = alternating checkerboard
0101 = PN 23 sequence
0110 = PN 9 sequence
0111 = one/zero word toggle
1000 = user input
1001 = 1-/0-bit toggle
1010 = 1x sync
1011 = one bit high
1100 = mixed bit frequency
0x00
When set, the
test data is
placed on the
output pins in
place of normal
data
0x0E
BIST enable
Open
BIST
INIT
Open
BIST
enable
0x00
When Bit 0 is
set, the BIST
function is
initiated
0x10
Offset adjust
(local)
8-bit device offset adjustment [7:0] (local)
Offset adjust in LSBs from +127 to 128 (twos complement format)
0x00
Device offset
trim
0x14
Output mode
00 = 3.3 V CMOS
10 = 1.8 V CMOS
Output mux
enable
(interleaved)
Output
disable
(local)
Open
Output
invert
(local)
00 = offset binary
01 = twos
complement
10 = gray code
11 = offset binary
(local)
0x00
Configures the
outputs and
the format of
the data
0x15
OUTPUT_ADJUST
3.3 V DCO
drive strength
00 = 1 stripe
(default)
01 = 2 stripes
10 = 3 stripes
11 = 4 stripes
1.8 V DCO
drive strength
00 = 1 stripe
01 = 2 stripes
10 = 3 stripes (default)
11 = 4 stripes
3.3 V data
drive strength
00 = 1 stripe
(default)
01 = 2 stripes
10 = 3 stripes
11 = 4 stripes
1.8 V data
drive strength
00 = 1 stripe
01 = 2 stripes
10 = 3 stripes
(default)
11 = 4 stripes
0x22
Determines
CMOS output
drive strength
properties
0x16
OUTPUT_PHASE
DCO
output
polarity
0 =
normal
1 =
inverted
(local)
Input clock phase adjust [2:0]
(Value is number of input clock
cycles of phase delay)
000 = no delay
001 = 1 input clock cycle
010 = 2 input clock cycles
011 = 3 input clock cycles
100 = 4 input clock cycles
101 = 5 input clock cycles
110 = 6 input clock cycles
111 = 7 input clock cycles
0x00
On devices that
utilize global
clock divide,
determines
which phase of
the divider
output is used
to supply the
output clock;
internal
latching is
unaffected
0x17
OUTPUT_DELAY
Enable
DCO
delay
Enable
data
delay
DCO/Data delay [2:0]
000 = 0.56 ns
001 = 1.12 ns
010 = 1.68 ns
011 = 2.24 ns
100 = 2.80 ns
101 = 3.36 ns
110 = 3.92 ns
111 = 4.48 ns
0x00
This sets the
fine output
delay of the
output clock
but does not
change internal
timing
0x19
USER_PATT1_LSB
B7
B6
B5
B4
B3
B2
B1
B0
0x00
User-defined
pattern, 1 LSB
0x1A
USER_PATT1_MSB
B15
B14
B13
B12
B11
B10
B9
B8
0x00
User-defined
pattern, 1 MSB
0x1B
USER_PATT2_LSB
B7
B6
B5
B4
B3
B2
B1
B0
0x00
User-defined
pattern, 2 LSB
0x1C
USER_PATT2_MSB
B15
B14
B13
B12
B11
B10
B9
B8
0x00
User-defined
pattern, 2 MSB
0x24
MISR_LSB
Open
B0
0x00
Least
significant byte
of MISR; read
only
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