ISL55210IRTZ Intersil, ISL55210IRTZ Datasheet - Page 10

• Manufacturer Part Number: ISL55210IRTZ
• Description: IC OPAMP DIFF 2200MHZ LP 16TQFN
• Manufacturer: Intersil

Specifications of ISL55210IRTZ

• Amplifier Type: Differential
• Number Of Circuits: 1
• Slew Rate: 150 V/µs
• Gain Bandwidth Product: 4GHz
• Current - Input Bias: 50µA
• Voltage - Input Offset: 100µV
• Current - Supply: 35mA
• Current - Output / Channel: 45mA
• Voltage - Supply, Single/dual (±): 3 V ~ 4.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: *
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• -3db Bandwidth: -

Typical Performance Curves
Applications
Basic Operation
The ISL55210 is a very wideband, voltage feedback based,
differential amplifier including an output common mode control
loop and optional power shutdown feature. Intended for very low
distortion differential signal driving, this non-unity gain stable
device also delivers extremely low input noise terms of
0.85nV/√Hz and 5pA/√Hz. Most applications are intended for AC
coupled I/O using a single 3.3V supply. It will operate over a
single supply range of 3.0V to 4.2V. Where DC coupled operation
is desired, using split power supplies will allow the ISL55210 I/O
common mode range limits to be observed while giving either a
differential I/O or single to differential configuration.
Most applications behave as a differential inverting op amp design.
There is, therefore, an input gain resistor on each side of the inputs
that must be driven. To retain overall low output noise, these
resistors are normally of low value. The device can be powered down
to <400µA supply current using the optional disable pin. To operate
normally, this pin should be asserted high using a simple logic gate
to +V
the power dissipation drops to <1mW but, due to the inverting op
amp type architecture, the input signal will feed forward through the
external resistors giving limited isolation.
Application and Characterization Circuits
The circuit of Figure 28 forms a starting point for many of the
characterization curves for the ISL55210. Since most lab sources
and measurement devices are single-ended, this circuit converts
to differential at the input through a wideband transformer and
would also be a typical application circuit coming from a single
ended source. Assuming the source is a 50Ω impedance, the R
resistors are set to provide both the input termination and the
gain. Since the inverting summing nodes act as virtual ground
points for AC signal analysis, the total termination impedance
across the input transformer secondary will be 2 * R
this equal to n
the bandwidth of the transformer (where "n" is the turns ratio).
The amplifier gain is then set by adjusting the feedback resistors
FIGURE 26. DEFAULT V
S
6
5
4
3
2
1
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5
or tied high through a 10kΩ resistor to +V
TEST CIRCUIT #1
INTERNALLY SET V
2
*R
S
will give a matched input impedance inside
CM
SUPPLY VOLTAGE (V)
AND MAX V
CM
10
MAXIMUM DIFFERENTIAL V
OUTPUT USING DEFAULT V
OPP
vs SUPPLY VOLTAGE
S
. When disabled,
G
. Setting
V
S+
ISL55210
P-P
CM
= 3.3V, T
G
A
values. Since the ISL55210 is a VFA design, increasing the
feedback resistor to get higher gain does not directly reduce the
bandwidth as it would with a CFA based design. This gives
increased flexibility in the input turns ratio and overall gain
setting (while holding a matched input impedance) over
alternate solutions.
Working with a transformer coupled input as shown in Figure 28,
or with two DC blocking caps from a differential source, means
the output common mode voltage set by either the default
internal V
will also appear as the input common mode voltage. This
provides a very easy way to control the ISL55210 I/O common
mode operating voltages for an AC coupled signal path. The
internal common mode loop holds the output pins to V
since there is no DC path for an I
input in Figure 28, that V
common mode voltage. It is useful, for this reason, to leave any
input transformer secondary centertap unconnected. The
internally set V
pin. With a single 3.3V supply, it is very close to 1.2V but will
change with total supply voltage across the device as shown in
Figure 26.
≈ +25°C, unless otherwise noted.
50
V
I
1µF
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5
ADT2-1T
1:1.4
TEST CIRCUIT #1
FIGURE 27. SUPPLY CURRENT vs SUPPLY VOLTAGE
CM
setting, or a voltage applied to the V
0.1uF
CM
50
50
R
R
G
G
voltage is referenced from the negative supply
FIGURE 28. TEST CIRCUIT #1
200
SINGLE SUPPLY VOLTAGE (V)
200
200
R
R
V
F
+
F
CM
+3.3V
-
CM
ISL55210
setting will also appear as the input
10k
33mA 110mW
(Continued)
T
A
PD
CM
= -40°C
current back towards the
T
A
1µF
1µF
V
= +85°C
O
200
LOAD
85
85
35
35
CM
T
A
control pin,
= +25°C
ADT1-1WT
March 2, 2011
1:1
CM
FN7811.0
and,
1µF
50
V
M