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| 型号： | ADA4950-1YCPZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC AMP DIFF LP 114MA 16LFCSP |
| 标准包装： | 1 |
| 放大器类型： | 差分 |
| 电路数： | 1 |
| 输出类型： | 差分 |
| 转换速率： | 2900 V/µs |
| -3db带宽： | 750MHz |
| 电压 - 输入偏移： | 200µV |
| 电流 - 电源： | 9.5mA |
| 电流 - 输出 / 通道： | 114mA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 11 V，±1.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°C |
| 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： | 标准包装 |
| 产品目录页面： | 765 (CN2011-ZH PDF) |
| 其它名称： | ADA4950-1YCPZ-R7DKR |
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ADA4950-1/ADA4950-2
Data Sheet
Rev. A | Page 24 of 28
HIGH PERFORMANCE ADC DRIVING
The ADA4950-x is ideally suited for broadband dc-coupled
applications. The circuit in Figure 63 shows a front-end
connection for an ADA4950-1 driving an AD9245 ADC,
with dc coupling on the ADA4950-1 input and output. (The
AD9245 achieves its optimum performance when driven
differentially.) The ADA4950-1 eliminates the need for a
transformer to drive the ADC and performs a single-ended-to-
differential conversion and buffering of the driving signal.
The ADA4950-1 is configured with a single 3.3 V supply and a
gain of 2 for a single-ended input to differential output. The
57.6 Ω termination resistor, in parallel with the single-ended
input impedance of 375 Ω, provides a 50 Ω termination for the
source. The additional 26.7 Ω Thevenin resistance added to the
inverting input balances the parallel impedance of the 50 Ω
source and the termination resistor driving the noninverting
input. The required Thevenin bias voltage of 0.27 VDC applied
to the lower loop is obtained by scaling the VREF output of the
AD9245 and buffering it with the AD8031.
In this example, the 50 Ω signal generator has a 1 V p-p unipolar
open-circuit output voltage, and 0.5 V p-p output voltage when
terminated in 50 Ω. The VOCM input is bypassed for noise reduc-
tion and set externally with 1% resistors to maximize output
dynamic range on the tight 3.3 V supply.
Because the inputs are dc-coupled, dc common-mode current
flows in the feedback loops, and a nominal dc level of 0.76 V is
present at the amplifier input terminals. A fraction of the output
signal is also present at the input terminals as a common-mode
signal; its level is equal to the ac output swing at the noninverting
output, divided down by the feedback factor of the lower loop. In
this example, this ripple is 0.5 V p-p × [276.7/(276.7 + 500)] =
0.18 V p-p. This ac signal is riding on the 0.76 V dc level, producing
a voltage swing between 0.67 V and 0.85 V at the input terminals.
This is well within the specified limits of 0.2 V to 1.5 V.
With an output common-mode voltage of 1.65 V, each ADA4950-1
output swings between 1.4 V and 1.9 V, opposite in phase, provid-
ing a gain of 2 and a 1 V p-p differential signal to the ADC input.
The differential RC section between the ADA4950-1 output and
the ADC provides single-pole low-pass filtering and extra buffering
for the current spikes that are output from the ADC input when
its SHA capacitors are discharged.
The AD9245 is configured for a 1 V p-p full-scale input by
connecting its SENSE pin to VREF, as shown in Figure 63.
33
50
57.6
0.1F
20pF
VIN–
VIN+
AGND
AVDD
AD9245
VREF SENSE
10F
+
0.1F
VOUT, dm = 1V p-p
VOUT, cm = +1.65V
1.0V p-p
UNIPOLAR
SIGNAL
SOURCE
ADA4950-1
+3.3V
500
250
NC
250
NC
26.7
0.1F
0V
1.0V
0.5V
VOCM
10k
0.1F
866
1.0k
0.1F
AD8031
0.1F
10F
+
07
95
7-
2
54
Figure 63. ADA4950-1 Driving an AD9245 ADC with Unipolar DC-Coupled Input and Output, Gain = 2
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| ADA4950-1YCPZ-RL | 功能描述:IC AMP DIFF LP 114MA 16LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:3.5 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:30pA 电压 - 输入偏移:2000µV 电流 - 电源:200µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| ADA4950-2 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3 |
| ADA4950-2YCP-EBZ | 功能描述:BOARD EVAL FOR ADA4950-2YCP 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:- |
| ADA4950-2YCPZ-R2 | 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Dual 制造商:Analog Devices 功能描述:FIXED GAIN 1,2&3 DIFF ADC DRIVER - Tape and Reel 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Dual }5.5V/11V 24-Pin LFCSP EP |
| ADA4950-2YCPZ-R7 | 功能描述:IC AMP DIFF DUAL 114MA 24LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源，单路/双路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
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