參數(shù)資料
型號(hào): AD7622BSTZRL
廠商: Analog Devices Inc
文件頁(yè)數(shù): 8/28頁(yè)
文件大小: 0K
描述: IC ADC 16BIT DIFFERENTL 48-LQFP
標(biāo)準(zhǔn)包裝: 2,000
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): 85mW
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-AD7622CBZ-ND - BOARD EVALUATION FOR AD7622
AD7622
Rev. 0 | Page 16 of 28
TRANSFER FUNCTIONS
Using the OB/2C digital input, the AD7622 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 23 and Table 7 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
23
-02
2
Figure 23. ADC Ideal Transfer Function
Table 7. Output Codes and Ideal Input Voltages
Digital Output Code (Hex)
Description
Analog Input
VREF = 2.048 V
Straight
Binary
Twos
Complement
FSR 1 LSB
+2.047938 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).
06
02
3-
0
23
RD
CS
100nF
AVDD
10F
100nF
AGND
DGND
DVDD
OVDD
OGND
CNVST
BUSY
SDOUT
SCLK
RESET
PD
REFBUFIN
10
D
CLOCK
AD7622
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
15
NOTE 5
50
50pF
NOTE 1
ANALOG
INPUT +
CC
2.7nF
U1
15
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
NORMAL
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.
Figure 24. Typical Connection Diagram
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