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參數(shù)資料
| 型號： | ISL55210IRTZ-T7 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 7/18頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP DIFF 2200MHZ LP 16TQFN |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 輸出類型： | 差分 |
| 轉(zhuǎn)換速率： | 5600 V/µs |
| 增益帶寬積： | 4GHz |
| -3db帶寬： | 2.2GHz |
| 電流 - 輸入偏壓： | 50µA |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 35mA |
| 電流 - 輸出 / 通道： | 45mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 4.2 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-TQFN（3x3） |
| 包裝： | 帶卷 (TR) |
ISL55210
15
FN7811.2
June 6, 2013
any VCM level shifting that needs to take place, the filter shape,
and this ICM issue into the ADC input pins. Here are 4 example
topologies suitable for different situations.
1. AC coupled, broadband RLC interstage filter design. This
approach lets the amplifier operate at its desired output
common mode, then provides the ADC common mode
voltage and current through a bias path as part of the filter
design’s last stage R values. The VB is set to include the IR
loss from that voltage to the ADC inputs due to the ICM
current. This circuit is the one shown on the front page where
we get a usable frequency range from about 500kHz to
150MHz.
2. AC coupled, higher frequency range interstage filter design.
valued inductors and implements the filter just using shunt
resistors at the end of the RLC filter (here, that is just the ADC
internal differential Rin). In this case, the ADC VCM can be tied
to the centerpoint of the bias path inductors (very much like a
Bias-T) to provide the common mode voltage and current to
the ADC inputs. These bias inductors do limit the low
frequency end of the operation where, with 1H values,
operation from 10MHz to 200MHz is supported using the
approach of Figure 35.
3. AC coupled with output side transformer. This design includes
an output side transformer, very similar to ADC
characterization circuits. This approach allows a slightly lower
amplifier output swing (if N > 1 is used) and very easy 2nd
order low pass responses to be implemented. It also provides
the ICM and VCM bias to the ADC through the transformer
centertap. This approach would be attractive for higher ADC
input swing targets and more aggressive noise power
bandwidth control needs.
4. DC coupled with ADC VCM and ICM provided from the
amplifier. Here, DC to very high frequency interstage low pass
filters can be provided. Again, the RS element must be low to
reduce the IR drop from the VCM of the converter, which now
shows up on the output of the ISL55210, to the ADC input
pins. In this case, split supplies are required to satisfy the
amplifier output and input common mode range limits
discussed earlier.
FIGURE 34. AC COUPLED, BROADBAND RLC INTERSTAGE FILTER DE
SIGN
FIGURE 35. AC COUPLED, HIGHER FREQUENCY RLC FILTER DESIGN
FIGURE 36. AC COUPLED WITH OUTPUT SIDE TRANSFORMER
FIGURE 37. DC COUPLED WITH A COMMON VCM VOLTAGE FROM THE
ADC
ISL55210
Vcm1
Rs
Rf
+3.3V
1.2V
Cb
Rt
Icm
Ct
Rin
Cin
ADC
s
R
t
R
>
Vcm2 = 0.535
or 1V
Ls
Vb
2
cm
V
t
R
cm
I
b
V
=
×
IN+
IN-
R
t
R
s
>
v
B
I
cm
R
t
×
–
V
cm2
=
Ls
Lp
>>
ISL55210
VCM1
RS
RF
+3.3V
1.2V
Cb
RT
ICM
Ct
Rin
Cin
ADC
IN+
IN-
VCM2 = 0.535
or 1V
LS
LP
2ICM
Ω
≤30
Rt
ISL55210
VCM1
RS
RF
+3.3V
1.2V
Cb
Rt
ICM
Ct
Rin
Cin
ADC
VCM2 = 0.535
or 1V
IN+
IN-
1:n
Ω
≤30
Rs
ISL55210
Rs
Rf
+3.0V
Rt
Icm
Ct
Rin
Cin
ADC
Vcm = 0.535V
or 1V
Ls
IN+
IN-
Vcm
-1.1V
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