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參數(shù)資料
| 型號： | ADA4927-1YCPZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/24頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP CF DIFF 65MA LN 16LFCSP |
| 特色產(chǎn)品： | ADA4927: Ultralow Distortion Current Feedback Differential ADC Driver |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 電流反饋 |
| 電路數(shù)： | 1 |
| 輸出類型： | 差分 |
| 轉(zhuǎn)換速率： | 5000 V/µs |
| -3db帶寬： | 2.3GHz |
| 電流 - 輸入偏壓： | 500nA |
| 電壓 - 輸入偏移： | 300µV |
| 電流 - 電源： | 20mA |
| 電流 - 輸出 / 通道： | 65mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 11 V，±2.25 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 16-LFCSP-VQ |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 765 (CN2011-ZH PDF) |
| 其它名稱： | ADA4927-1YCPZ-R7DKR |
ADA4927-1/ADA4927-2
Rev. A | Page 19 of 24
For an unbalanced, single-ended input signal (see Figure 49),
the input impedance is
()
+
×
=
F
G
F
G
SE
IN
R
2
1
,
ADA4927
RL VOUT, dm
+VS
–VS
RG
RF
VOCM
RIN, SE
0
75
74
-04
9
Figure 49. The ADA4927 with Unbalanced (Single-Ended) Input
The input impedance of the circuit is effectively higher than it
would be for a conventional op amp connected as an inverter
because a fraction of the differential output voltage appears at
the inputs as a common-mode signal, partially bootstrapping
the voltage across the input resistor RG. The common-mode
voltage at the amplifier input terminals can be easily determined
by noting that the voltage at the inverting input is equal to the
noninverting output voltage divided down by the voltage divider
formed by RF and RG in the lower loop. This voltage is present at
both input terminals due to negative voltage feedback and is in
phase with the input signal, thus reducing the effective voltage
across RG in the upper loop and partially bootstrapping RG.
Terminating a Single-Ended Input
This section deals with how to properly terminate a single-
ended input to the ADA4927 with a gain of 1, RF = 348 Ω, and
RG = 348 Ω. An example using an input source with a terminated
output voltage of 1 V p-p and a source resistance of 50 Ω illustrates
the four simple steps that must be followed. Note that, because
the terminated output voltage of the source is 1 V p-p, the open
circuit output voltage of the source is 2 V p-p. The source shown
in Figure 50 indicates this open-circuit voltage.
1. The input impedance must be calculated using the following
formula:
464
)
348
(
2
348
1
348
)
(
2
1
=
+
×
=
+
×
=
F
G
F
G
IN
R
RS
50
VS
2V p-p
RIN
464
ADA4927
RL VOUT, dm
+VS
–VS
RF
348
RG
348
RG
348
VOCM
RF
348
07
57
4-
0
50
Figure 50. Calculating Single-Ended Input Impedance RIN
2.
To match the 50 Ω source resistance, the termination
resistor, RT, is calculated using RT||464 Ω = 50 Ω. The
closest standard 1% value for RT is 56.2 Ω.
ADA4927
RL
VOUT, dm
+VS
–VS
RF
348
RS
50
VS
2V p-p
RIN
50
RG
348
RG
348
RT
56.2
VOCM
RF
348
0
757
4-
05
1
Figure 51. Adding Termination Resistor RT
3.
upper feedback loop is now greater than the RG in the
lower loop due to the addition of the termination resistors.
To compensate for the imbalance of the gain resistors,
a correction resistor (RTS) is added in series with RG in the
lower loop. RTS is equal to the Thevenin equivalent of the
source resistance RS and the termination resistance RT and
is equal to RS||RT.
RS
50
VS
2V p-p
RTH
26.5
RT
56.2
VTH
1.06V p-p
0
75
74
-05
2
Figure 52. Calculating the Thevenin Equivalent
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參數(shù)描述 |
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| ADA4927-1YCPZ-RL | 功能描述:IC OPAMP CF DIFF 65MA LN 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| ADA4927-2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultralow Distortion Current Feedback Differential ADC Driver |
| ADA4927-2YCP-EBZ | 功能描述:BOARD EVAL FOR ADA4927-2YCP RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 運(yùn)算放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- |
| ADA4927-2YCPZ-R2 | 功能描述:IC OPAMP CF DIFF DUAL LN 24LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:帶卷 (TR) |
| ADA4927-2YCPZ-R7 | 功能描述:IC OPAMP CF DIFF DUAL LN 24LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:帶卷 (TR) |
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