參數資料
型號: AD7927BRUZ
廠商: Analog Devices Inc
文件頁數: 8/28頁
文件大?。?/td> 0K
描述: IC ADC 12BIT 8CH 200KSPS 20TSSOP
標準包裝: 75
位數: 12
采樣率(每秒): 200k
數據接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
轉換器數目: 1
功率耗散(最大): 7.5mW
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: 20-TSSOP(0.173",4.40mm 寬)
供應商設備封裝: 20-TSSOP
包裝: 管件
輸入數目和類型: 8 個單端,單極
產品目錄頁面: 779 (CN2011-ZH PDF)
配用: EVAL-AD7927CBZ-ND - BOARD EVALUATION FOR AD7927
AD7927
Data Sheet
Rev. D | Page 16 of 28
For ac applications, removing high frequency components from
the analog input signal is recommended by use of an RC low-
pass filter on the relevant analog input pin. In applications where
harmonic distortion and signal-to-noise ratio are critical, the
analog input should be driven from a low impedance source. Large
source impedances significantly affect the ac performance of the
ADC. This may necessitate the use of an input buffer amplifier.
The choice of the op amp is a function of the particular application.
When no amplifier is used to drive the analog input, limit
the source impedance to low values. The maximum source
impedance depends on the amount of THD that can be
tolerated. The THD increases as the source impedance
increases, and performance degrades (see Figure 8).
R1
D1
D2
AVDD
VIN
C2
30pF
C1
4pF
CONVERSION PHASE: SWITCH OPEN
TRACK PHASE: SWITCH CLOSED
03
08
8-
01
6
Figure 16. Equivalent Analog Input Circuit
ADC TRANSFER FUNCTION
The output coding of the AD7927 is either straight binary
or twos complement, depending on the status of the LSB in
the control register. The designed code transitions occur at
successive LSB values (that is, 1 LSB, 2 LSBs, and so forth).
The LSB size is REFIN/4096 for the AD7927. The ideal transfer
characteristic for the AD7927 when straight binary coding is
selected is shown in Figure 17, and the ideal transfer characteristic
for the AD7927 when twos complement coding is selected is
000…000
0V
ANALOG INPUT
111…111
000…001
000…010
111…110
111…000
011…111
1LSB
1LSB = VREF/4096
+VREF – 1LSB
NOTES
VREF IS EITHER REFIN OR 2 × REFIN.
03
08
8-
0
17
Figure 17. Straight Binary Transfer Characteristic
A
DC
CO
DE
ANALOG INPUT
100…000
011…111
100…001
100…010
011…110
000…001
111…111
000…000
1LSB = 2 × VREF/4096
+VREF – 1LSB
–VREF + 1LSB
VREF – 1LSB
03
08
8-
01
8
Figure 18. Twos Complement Transfer Characteristic with REFIN ± REFIN
Input Range
HANDLING BIPOLAR INPUT SIGNALS
Figure 19 shows how useful the combination of the 2 × REFIN
input range and the twos complement output coding scheme
is for handling bipolar input signals. If the bipolar input signal
is biased about REFIN and twos complement output coding is
selected, then REFIN becomes the zero code point, REFIN is
negative full scale and +REFIN becomes positive full scale, with
a dynamic range of 2 × REFIN.
R3
R2
R4
AD7927
V
DOUT
011…111
000…000
100…000
(= 0V)
0V
V
VREF
0.1F
R1
R1 = R2 = R3 = R4
AVDD
REFIN
VIN0
VIN7
VDRIVE
TWOS
COMPLEMENT
VDD
DSP/
MICROPROCESSOR
+REFIN
REFIN
–REFIN
(= 2 × REFIN)
03
08
8-
0
19
Figure 19. Handling Bipolar Signals
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AD7927BRUZ 制造商:Analog Devices 功能描述:IC 12BIT ADC SMD 7927 TSSOP20
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