参数资料
| 型号： | ADA4937-1YCPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/29页 |
| 文件大小： | 0K |
| 描述： | IC ADC DIFF DRIVER 16-LFCSP |
| 设计资源： | Driving AD9233/46/54 ADCs in AC-Coupled Baseband Appls (CN0051) |
| 标准包装： | 5,000 |
| 类型： | ADC 驱动器 |
| 应用： | 数据采集 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 16-LFCSP-VQ |
| 包装： | 带卷 (TR) |
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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
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| ADA4937-2YCP-EBZ | 功能描述:BOARD EVAL FOR ADA4937-2YCP RoHS:是 类别:编程器，开发系统 >> 评估板 - 运算放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- |
| ADA4937-2YCPZ-R2 | 制造商:Analog Devices 功能描述:SP AMP DIFF AMP DUAL 5.25V 24LFCSP EP - Tape and Reel 制造商:Analog Devices 功能描述:IC DIFF AMP 1.9GHZ 6000V/ LFCSP-24 制造商:Analog Devices 功能描述:IC, DIFF AMP, 1.9GHZ, 6000V/ uS, LFCSP-24, No. of Amplifiers:2, Input Offset Vol |
| ADA4937-2YCPZ-R7 | 功能描述:IC ADC DRIVER DIFF DUAL 24LFCSP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| ADA4937-2YCPZ-RL | 功能描述:IC ADC DRIVER DUAL DIFF 24LFCSP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| ADA4938-1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Ultra-Low Distortion Differential ADC Driver |
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