19 FN7693.2 May 2, 2011 The power-down mode can also be controlled through the SPI port, which overrides the NAPSLP pin setting. Detai" />
參數(shù)資料
型號: KAD5510P-12Q48
廠商: Intersil
文件頁數(shù): 11/31頁
文件大小: 0K
描述: IC ADC 10BIT CMOS 125MSPS 48QFN
標準包裝: 100
系列: FemtoCharge™
位數(shù): 10
采樣率(每秒): 125M
數(shù)據(jù)接口: 串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 205mW
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 48-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 48-QFN(7x7)
包裝: 托盤
輸入數(shù)目和類型: *
KAD5510P
19
FN7693.2
May 2, 2011
The power-down mode can also be controlled through the SPI
port, which overrides the NAPSLP pin setting. Details on this are
indexed function when controlled from the SPI, but a global
function when driven from the pin.
Data Format
Output data can be presented in three formats: two’s complement,
Gray code and offset binary. The data format can be controlled
through the SPI port. Details on this are contained in “Serial
Offset binary coding maps the most negative input voltage to code
0x000 (all zeros) and the most positive input to 0xFFF (all ones). Two’s
complement coding simply complements the MSB of the offset binary
representation.
When calculating Gray code the MSB is unchanged. The
remaining bits are computed as the XOR of the current bit
position and the next most significant bit. Figure 32 shows this
operation.
Converting back to offset binary from Gray code must be done
recursively, using the result of each bit for the next lower bit as
shown in Figure 33.
Mapping of the input voltage to the various data formats is
shown in Table 2.
TABLE 1. NAPSLP PIN SETTINGS
NAPSLP PIN
MODE
AVSS
Normal
Float
Sleep
AVDD
Nap
FIGURE 32. BINARY TO GRAY CODE CONVERSION
8
9
7
0
1
BINARY
8
9
7
0
GRAY CODE
1
FIGURE 33. GRAY CODE TO BINARY CONVERSION
8
9
7
0
1
BINARY
8
9
7
0
GRAY CODE
1
TABLE 2. INPUT VOLTAGE TO OUTPUT CODE MAPPING
INPUT VOLTAGE
OFFSET BINARY
TWO’S COMPLEMENT
GRAY CODE
–Full Scale
000 00 000 00
100 00 000 00
000 00 000 00
–Full Scale + 1LSB
000 00 000 01
100 00 000 01
000 00 000 01
Mid–Scale
100 00 000 00
000 00 000 00
110 00 000 00
+Full Scale – 1LSB
111 11 111 10
011 11 111 10
100 00 000 01
+Full Scale
111 11 111 11
011 11 111 11
100 00 000 00
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