參數(shù)資料
型號: AD7621ACPZ
廠商: Analog Devices Inc
文件頁數(shù): 8/32頁
文件大小: 0K
描述: IC ADC 16BIT 2MSPS DIFF 48LFCSP
標(biāo)準(zhǔn)包裝: 1
系列: PulSAR®
位數(shù): 16
采樣率(每秒): 2M
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): 86mW
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-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 48-LFCSP-VQ(7x7)
包裝: 托盤
輸入數(shù)目和類型: 1 個差分,雙極
AD7621
Rev. 0 | Page 16 of 32
TRANSFER FUNCTIONS
Using the OB/2C digital input, the AD7621 offers two output
codings: straight binary and twos complement. The LSB size
with VREF = 2.048 V is 2 × VREF/65536, which is 62.5 μV. Refer to
Figure 22 and Table 7 for the ideal transfer characteristic.
04565-025
000...000
000...001
000...010
111...101
111...110
111...111
ADC
CODE
(S
tra
ight
Bina
ry
)
ANALOG INPUT
+FSR–1.5 LSB
+FSR–1 LSB
–FSR+1 LSB
–FSR
–FSR+0.5 LSB
Figure 22. ADC Ideal Transfer Function
Table 7. Output Codes and Ideal Input Voltages
Digital Output Code
Description
Analog Input
VREF = 2.048 V
Straight
Binary
Twos
Complement
FSR 1 LSB
+2.047938 V
0xFFFF1
0x7FFF1
FSR 2 LSB
+2.047875 V
0xFFFE
0x7FFE
Midscale + 1 LSB
+62.5 μV
0x8001
0x0001
Midscale
0 V
0x8000
0x0000
Midscale 1 LSB
62.5 μV
0x7FFF
0xFFFF
FSR + 1 LSB
2.047938 V
0x0001
0x8001
FSR
2.048 V
0x00002
0x80002
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).
04565-026
RD
CS
100nF
AVDD
10
μF
100nF
AGND
DGND
DVDD
OVDD
OGND
CNVST
BUSY
SDOUT
SCLK
RESET
PD
REFBUFIN
10
Ω
D
CLOCK
AD7621
MICROCONVERTER/
MICROPROCESSOR/
DSP
SERIAL
PORT
DIGITAL
INTERFACE
SUPPLY
(2.5V OR 3.3V)
ANALOG
SUPPLY (2.5V)
OVDD
WARP
DIGITAL
SUPPLY (2.5V)
IN+
IN–
U2
10
Ω
NOTE 5
50
Ω
50pF
NOTE 1
ANALOG
INPUT +
CC
1nF
U1
10
Ω
NOTE 1
SER/PAR
OB/2C
REFGND
REF
PDBUF
PDREF
100nF
ANALOG
INPUT –
NOTE 2
NOTE 3
NOTE 4
NOTE 3
NOTE 7
NOTE 6
IMPULSE
10
μF
10
μF
CREF
10
μF
10k
Ω
50pF
1. SEE ANALOG INPUT 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 10
μF CERAMIC CAPACITOR (X5R, 1206 SIZE) IS RECOMMENDED (e.g., PANASONIC ECJ3YB0J106M).
5. OPTION, SEE POWER SUPPLY SECTION.
7. OPTIONAL LOW JITTER CNVST, SEE CONVERSION CONTROL SECTION.
Figure 23. Typical Connection Diagram
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