參數(shù)資料
型號: AD7660ASTZRL
廠商: Analog Devices Inc
文件頁數(shù): 3/20頁
文件大?。?/td> 0K
描述: IC ADC 16BIT UNIPOLAR 48LQFP
標(biāo)準(zhǔn)包裝: 2,000
系列: PulSAR®
位數(shù): 16
采樣率(每秒): 100k
數(shù)據(jù)接口: 串行,并聯(lián)
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 25mW
電壓電源: 模擬和數(shù)字
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 48-LQFP
供應(yīng)商設(shè)備封裝: 48-LQFP(7x7)
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 2 個(gè)偽差分,單極
配用: EVAL-AD7660CBZ-ND - BOARD EVALUATION FOR AD7660
REV. D
AD7660
–11–
100nF
10 F
100nF
10 F
AVDD
10 F
100nF
AGND
DGND
DVDD
OVDD
OGND
CS
RD
SER/
PAR
CNVST
BUSY
SDOUT
SCLK
RESET
PD
IN
INGND
NOTE 2
U1
REFGND
CREF
NOTE 1
2.5V REF
NOTE 1
REF
100
D
NOTE 3
CLOCK
AD7660
ANALOG INPUT
(0V TO 2.5V)
C/ P/DSP
SERIAL
PORT
DIGITAL SUPPLY
(3.3V OR 5V)
ANALOG
SUPPLY
(5V)
DVDD
OB/
2C
NOTES
1. WITH THE AD780 OR THE ADR291 VOLTAGE REFERENCE, CREF IS 47 F,
SEE VOLTAGE REFERENCE INPUT SECTION.
2. THE OP184 IS RECOMMENDED.
3. OPTIONAL LOW JITTER
CNVST.
Figure 5. Typical Connection Diagram
Transfer Functions
Using the OB/
2C digital input, the AD7660 offers two output
codings: straight binary and twos complement. The LSB size is
VREF/65536, which is about 38.15
mV. The ideal transfer charac-
teristic for the AD7660 is shown in Figure 4 and Table II.
000...000
000...001
000...010
111...101
111...110
111...111
ADC
CODE
Straight
Binary
ANALOG INPUT
VREF –1.5 LSB
VREF –1 LSB
1 LSB
0V
0.5 LSB
1 LSB = VREF/65536
Figure 4. ADC Ideal Transfer Function
Table II. Output Codes and Ideal Input Voltages
Digital Output Code (Hex)
Analog
Straight
Twos
Description
Input
Binary
Complement
FSR – 1 LSB
2.499962 V FFFF
1
7FFF
1
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
mV
0001
8001
–FSR
0 V
0000
2
8000
2
NOTES
1This is also the code for overrange analog input (V
IN – VINGND above
VREF – VREFGND).
2This is also the code for underrange analog input (V
IN below VINGND).
TYPICAL CONNECTION DIAGRAM
Figure 5 shows a typical connection diagram for the AD7660.
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