參數(shù)資料
型號： AD7643BSTZRL
廠商： Analog Devices Inc
文件頁數(shù)： 8/28頁
文件大?。?/td> 0K
描述： IC ADC 18BIT DIFFER W/REF 48LQFP
標(biāo)準(zhǔn)包裝： 2,000
系列： PulSAR®
位數(shù)： 18
采樣率（每秒）： 1.25M
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）： 80mW
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： 1 個(gè)差分，雙極
配用： EVAL-AD7643CBZ-ND - BOARD EVALUATION FOR AD7643
AD7643
Rev. 0 | Page 16 of 28
TRANSFER FUNCTIONS
Using the OB/2C digital input, except in 18-bit interface mode,
the AD7643 offers two output codings: straight binary and twos
complement. The LSB size with VREF = 2.048 V is 2 × VREF/
262,144, which is 15.623 μV. Refer to Figure 22 and Table 8 for
the ideal transfer characteristic.
000...000
000...001
000...010
111...101
111...110
111...111
ADC
CO
DE
(
S
tr
ai
g
h
t
Bi
n
ar
y)
ANALOG INPUT
+FSR – 1.5 LSB
+FSR – 1 LSB
–FSR + 1 LSB
–FSR
–FSR + 0.5 LSB
060
24
-02
2
Figure 22. ADC Ideal Transfer Function
Table 8. Output Codes and Ideal Input Voltages
Digital Output Code (Hex)
Description
Analog Input
VREF = 2.048 V
Straight
Binary
Twos
Complement
FSR 1 LSB
+2.0479844 V
0x3FFFF1
FSR 2 LSB
+2.0479688 V
0x3FFFE
0x1FFFE
Midscale + 1 LSB
+15.625 μV
0x20001
0x00001
Midscale
0 V
0x20000
0x00000
Midscale 1 LSB
15.625 μV
0x1FFFF
0x3FFFF
FSR + 1 LSB
2.0479844 V
0x00001
0x20001
FSR
2.048 V
0x000002
0x200002
1 This is also the code for overrange analog input (VIN+ VIN above
+VREF VREFGND).
2 This is also the code for underrange analog input (VIN+ VIN below
VREF + VREFGND).
RD
CS
100nF
AVDD
10F
100nF
AGND
DGND
DVDD
OVDD
OGND
CNVST
BUSY
SDOUT
SCLK
RESET
PD
REFBUFIN
10
D
CLOCK
AD7643
MICROCONVERTER/
MICROPROCESSOR/
DSP
SERIAL
PORT
DIGITAL
INTERFACE
SUPPLY
(2.5V OR 3.3V)
ANALOG
SUPPLY (2.5V)
OVDD
DIGITAL
SUPPLY (2.5V)
IN+
IN–
U2
15
NOTE 5
50
50pF
NOTE 1
ANALOG
INPUT +
CC
2.7nF
U1
15
NOTE 1
MODE0
MODE1
D0/OB/2C
REFGND
REF
PDBUF
PDREF
100nF
ANALOG
INPUT –
NOTE 2
NOTE 3
NOTE 4
NOTE 3
NOTE 7
NOTE 6
10F
CREF
10F
10k
50pF
1. SEE ANALOG INPUTS SECTION.
2. THE AD8021 IS RECOMMENDED. SEE DRIVER AMPLIFIER CHOICE SECTION.
3. THE CONFIGURATION SHOWN IS USING THE INTERNAL REFERENCE. SEE VOLTAGE REFERENCE INPUT SECTION.
4. A 10F CERAMIC CAPACITOR (X5R, 1206 SIZE) IS RECOMMENDED (FOR EXAMPLE, PANASONIC ECJ3YB0J106M).
SEE VOLTAGE REFERENCE INPUT SECTION.
5. OPTION, SEE POWER SUPPLY SECTION.
6. OPTION, SEE POWER-UP SECTION.
7. OPTIONAL LOW JITTER CNVST, SEE CONVERSION CONTROL SECTION.
06
02
4-
0
23
Figure 23. Typical Connection Diagram
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