- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄8629 > ADA4937-2YCPZ-R7 (Analog Devices Inc)IC ADC DRIVER DIFF DUAL 24LFCSP PDF資料下載
參數(shù)資料
| 型號(hào)： | ADA4937-2YCPZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 14/29頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC DRIVER DIFF DUAL 24LFCSP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | ADC 驅(qū)動(dòng)器 |
| 應(yīng)用： | 數(shù)據(jù)采集 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 24-LFCSP-VQ（4x4） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 765 (CN2011-ZH PDF) |
| 其它名稱： | ADA4937-2YCPZ-R7DKR |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁當(dāng)前第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁
ADA4937-1/ADA4937-2
Data Sheet
Rev. D | Page 20 of 28
2.
For the source termination to be 50 Ω, the termination
resistor (RT) is calculated using RT||RIN = 50 Ω, which
makes RT equal to 61.9 Ω.
06
59
1-
08
2
ADA4937
RL
VO
+VS
–VS
RS
50
RG
200
RG
200
RF
200
RF
200
VOCM
VS
2V
50
RT
61.9
Figure 57. Adding Termination Resistor RT
3.
To compensate for the imbalance of the gain resistors,
a correction resistor (RTS) is added in series with the
inverting Input Gain Resistor RG. RTS is equal to the
Thevenin equivalent of the Source Resistance RS||RT.
06
59
1-
08
3
RS
50
VS
2V
RT
61.9
RTH
27.4
VTH
1.1V
Figure 58. Calculating Thevenin Equivalent
RTS = RTH = RS||RT = 27.4 Ω. Note that VTH is not equal to VS/2,
which would be the case if the termination were not affected by
the amplifier circuit.
06
59
1-
08
4
ADA4937
RL
VO
0.97V
+VS
–VS
RTH
27.4
RG
200
RG
200
RF
200
RF
200
VOCM
VTH
1.1V
RTS
27.4
Figure 59. Balancing Gain Resistor RG
4.
The feedback resistor is calculated to adjust the output
voltage.
a.
To make the output voltage VOUT = 1 V, RF must be
calculated using the following formula:
Ω
207
1
.
1
)
4
.
27
200
(
1
)
(
TH
TS
G
OUT
F
V
R
V
R
b.
To make VO = VS = 2 V to recover the loss due to the
input termination, RF should be
Ω
414
1
.
1
)
4
.
27
200
(
2
)
(
TH
TS
G
OUT
F
V
R
V
R
06
59
1-
085
ADA4937
RL
VO
+VS
–VS
RS
50
RG
200
RG
200
RF
VOCM
VS
2V
RT
61.9
RTS
27.4
Figure 60. Complete Single-Ended-to-Differential System
INPUT COMMON-MODE VOLTAGE RANGE IN
SINGLE-SUPPLY APPLICATIONS
The ADA4937-x is optimized for level-shifting ground-referenced
input signals. As such, the center of the input common-mode
range is shifted approximately 1 V down from midsupply. For
5 V single-supply operation, the input common-mode range at
the summing nodes of the amplifier is 0.3 V to 3.0 V, and 0.3 V
to 1.2 V with a 3.3 V supply. To avoid clipping at the outputs,
the voltage swing at the +IN and IN terminals must be confined
to these ranges.
SETTING THE OUTPUT COMMON-MODE VOLTAGE
approximately equal to the midsupply point, [(+VS) + (VS)]/2.
Relying on this internal bias results in an output common-mode
voltage that is within about 100 mV of the expected value.
In cases where more accurate control of the output common-
mode level is required, it is recommended that an external source,
or resistor divider (10 kΩ or greater resistors), be used. The
output common-mode offset listed in Table 2 and Table 4 assumes
that the VOCM input is driven by a low impedance voltage source.
It is also possible to connect the VOCM input to a common-mode
level (CML) output of an ADC. However, care must be taken to
ensure that the output has sufficient drive capability. The input
impedance of the VOCM pin is approximately 10 kΩ. If multiple
ADA4937-x devices share one reference output, it is recommended
that a buffer be used.
Table 10 and Table 11 list several common gain settings, asso-
ciated resistor values, input impedances, and output noise density
values for both balanced and unbalanced input configurations.
POWER-DOWN OPERATION
The ADA4937-x power-down pin features an internal 25 kΩ
pull-up resistor to the positive supply (+VS). This ensures that,
with the power-down pin left unconnected (floating), the
ADA4937-x turns on. Applying a voltage of ≤1 V turns the
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD5412AREZ | IC DAC 12BIT SER 24TSSOP |
| ADA4938-2ACPZ-R7 | IC ADC DRIVER DIFF DUAL 24LFCSP |
| DAC8043A1ESZ | IC DAC 12BIT MULT SRL INP 8SOIC |
| VI-2WN-IV-F2 | CONVERTER MOD DC/DC 18.5V 150W |
| VI-B3X-MX-S | CONVERTER MOD DC/DC 5.2V 75W |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADA4937-2YCPZ-RL | 功能描述:IC ADC DRIVER DUAL DIFF 24LFCSP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變?cè)鲆娣糯笃?應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| ADA4938-1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultra-Low Distortion Differential ADC Driver |
| ADA4938-1_06 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultra-Low Distortion Differential ADC Driver |
| ADA4938-1_07 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultra-Low Distortion Differential ADC Driver |
| ADA4938-1ACPZ-R2 | 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single ±5.5V/11V 16-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:SP AMP DIFF AMP SGL 5.5V/11V 16LFCSP EP - Tape and Reel 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single }5.5V/11V 16-Pin LFCSP EP Tape & Reel 制造商:Analog Devices 功能描述:IC AMP DIFFADCDR16BIT16LFCSP |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。