參數(shù)資料
型號(hào): EVAL-AD7661CBZ
廠商: Analog Devices Inc
文件頁(yè)數(shù): 9/28頁(yè)
文件大小: 0K
描述: BOARD EVALUATION FOR AD7661
標(biāo)準(zhǔn)包裝: 1
系列: PulSAR®
ADC 的數(shù)量: 1
位數(shù): 16
采樣率(每秒): 100k
數(shù)據(jù)接口: 串行,并聯(lián)
輸入范圍: ±VREF
在以下條件下的電源(標(biāo)準(zhǔn)): 16mW @ 100kSPS
工作溫度: -40°C ~ 85°C
已用 IC / 零件: AD7661
已供物品: 板,CD
相關(guān)產(chǎn)品: AD7661ACPZRL-ND - IC ADC 16BIT W/REF 48-LFCSP
AD7661ASTZ-ND - IC ADC 16BIT W/REF 48-LQFP
AD7661ACPZ-ND - IC ADC 16BIT W/REF 48LFCSP
AD7661ASTZRL-ND - IC ADC 16BIT W/REF 48LQFP
AD7661
Rev. 0 | Page 17 of 28
Transfer Functions
Table 7. Output Codes and Ideal Input Voltages
Digital Output Code (Hex)
Description
Analog
Input
Straight
Binary
Twos
Complement
FSR –1 LSB
2.499962 V
FFFF1
FSR – 2 LSB
2.499923 V
FFFE
7FFE
Midscale + 1 LSB
1.250038 V
8001
0001
Midscale
1.25 V
8000
0000
Midscale – 1 LSB
1.249962 V
7FFF
FFFF
–FSR + 1 LSB
38 V
0001
8001
–FSR
0 V
00002
Using the OB/2C digital input, the AD7661 offers two output
codings: straight binary and twos complement. The LSB size is
VREF/65536, which is about 38.15 V. The AD7661’s ideal
transfer characteristic is shown in Figure 25 and Table 7.
000...000
000...001
000...010
111...101
111...110
111...111
ADC
CODE
(S
tra
ight
Bina
ry
)
ANALOG INPUT
VREF – 1.5 LSB
VREF – 1 LSB
1LSB
0V
0.5 LSB
1 LSB = V REF/65536
03033-0-021
1This is also the code for overrange analog input (VIN – VINGND above
VREF – VREFGND).
2This is also the code for underrange analog input (VIN below VINGND).
Figure 25. ADC Ideal Transfer Function
NOTES
1THE CONFIGURATION SHOWN IS USING THE INTERNAL REFERENCE AND INTERNAL BUFFER.
2THE AD8021 IS RECOMMENDED. SEE DRIVER AMPLIFIER CHOICE SECTION.
3OPTIONAL LOW JITTER.
4A 10
F CERAMIC CAPACITOR (X5R, 1206 SIZE) IS RECOMMENDED (e.g., PANASONIC ECJ3YB0J106M).
SEE VOLTAGE REFERENCE INPUT SECTION.
AD7661
D3
CLOCK
C/P/DSP
SERIAL
PORT
DIGITAL SUPPLY
(3.3V OR 5V)
DVDD
100nF
+
10
F
100nF
+
10
F
20
100nF
+
10
F
ANALOG
SUPPLY
(5V)
CC
ANALOG INPUT
(0V TO 2.5V)
PD
RESET
SER/PAR
OB/2C
BUSY
SDOUT
SCLK
INGND
IN
REFGND
REF
AGND
AVDD
DGND
DVDD
OVDD
OGND
03033-0-022
U12
PDREF
PDBUF
RD
CS
CNVST
REFBUFIN1
100nF
BYTESWAP
CR4
Figure 26. Typical Connection Diagram
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