isl55211 Intersil Corporation, isl55211 Datasheet

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isl55211

Manufacturer Part Number
isl55211
Description
Wideband, Low Noise, Low Distortion, Fixed Gain, Differential Amplifier
Manufacturer
Intersil Corporation
Datasheet
Wideband, Low Noise, Low Distortion, Fixed Gain,
Differential Amplifier
ISL55211
The ISL55211 is a wideband, differential input to differential
output amplifier offering 3 possible internal gain settings.
Using fixed 500Ω internal feedback resistors, the amplifier
may be configured for a differential gain of 2, 4 or 5V/V
depending on which combination of input pins are connected
to the signal source. Internal feedback capacitors controls the
signal bandwidth to be a constant 1.4GHz in all gain settings.
Ideally suited for AC-coupled data acquisition applications, the
output DC common mode voltage is controlled through an
external V
supply pin. Where the differential signal source is AC-coupled,
the input common mode voltage will equal the output
common mode voltage.
Intended for very high dynamic range ADC interface
applications, the ISL55211 offers 5600V/µs differential slew
rate, <12nV/√Hz output noise, and >100dBc SFDR to
>100MHz for 2V
balanced architecture effectively suppresses even order
distortion terms - an important issue for very wide band 1st
Nyquist zone ADC interface applications. Minimum gain
operation of 2V/V (6dB) with <1dB peaking ensures stable
performance over-temperature. It's ultra high differential slew
rate of 5600V/µs provides adequate performance margin for
large signal application through 500MHz.
The ISL55211 requires only a single 3.3V (max. 4.2V) power
supply and 35mA quiescent current, providing a very low
power solution (115mW). Further power savings are possible
using the optional power shutdown control - where the
quiescent current can be reduced to <0.4mA. A companion
device, the ISL55210, offers similar performance where the
feedback and gain resistors are external. Both are available in
a 16 Ld TQFN (Pb-free) package and are specified for
operation over the -40°C to +85°C ambient temperature
range.
June 21, 2011
FN7868.0
180mV
For ADC -1dBFS
V
50
i
CM
HIGH GAIN, VERY LOW POWER, ADC INTERFACE WITH 3
P-P
ADT4-1T
1:2
pin or left to default to 1.2V above the negative
P-P
V
CM
2-tone 3rd order intermodulation. Its
1.2V
+
+3.3V
-
ISL55211
G = 5V/V
1
(115mW)
35mA
20 log
22pF
10
10
V
V
ADC
i
= 20dB
ADT2-1T
1:1.4
FIGURE 1. TYPICAL APPLICATION CIRCUIT
50
50
RD
Intersil (and design) and FemtoCharge are trademarks owned by Intersil Corporation or one of its subsidiaries.
120nH
120nH
ORDER OUTPUT FILTER
V
ADC
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
V
CM
14Bit 500MSPS
1-888-INTERSIL or 1-888-468-3774
300
ISLA214P50
(850mW)
8pF
Features
• 3 Fixed Gain Options . . . . . . . . . . . . . . . . . . . . . . . 2, 4, or 5V/V
• Constant Bandwidth Over Gain . . . . . . . . . . . . . . . . . . 1.4GHz
• Differential Slew Rate . . . . . . . . . . . . . . . . . . . . . . . 5,600V/µs
• 2V
• Low Differential Output Noise (Gain 5V/V) . . . . . . <12nV/√Hz
• Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . 3.0V to 4.2V
• Quiescent Power (3.3V Supply) . . . . . . . . . . . . . . . . . .115mW
Applications
• Low Power, High Dynamic Range ADC Interface
• Differential Mixer Output Amplifier
• SAW Filter Pre/Post Driver
• Fixed Gain Coax Receiver
Related Devices
Related Literature
ISL55210
ISLA112P50
ISLA214P50
AN1649
Evaluation Boards”
All other trademarks mentioned are the property of their respective owners.
P-P
-10
-13
, 2-tone IM3 (200Ω) 100MHz . . . . . . . . . . . . . . -103dBc
23
20
17
14
11
-1
-4
-7
8
5
2
1M
- “Designer’s guide to the ISL55210 and ISL55211
- External Gain Set Version
- 14-bit, 500MSPS ADC (<850mW)
- 12-bit, 500MSPS ADC (<500mW)
MEASURED FREQUENCY RESPONSE
|
Copyright Intersil Americas Inc. 2011. All Rights Reserved
10M
FREQUENCY (Hz)
100M
1G

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isl55211 Summary of contents

Page 1

... It's ultra high differential slew rate of 5600V/µs provides adequate performance margin for large signal application through 500MHz. The ISL55211 requires only a single 3.3V (max. 4.2V) power supply and 35mA quiescent current, providing a very low power solution (115mW). Further power savings are possible using the optional power shutdown control - where the quiescent current can be reduced to < ...

Page 2

... RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL55211. For more information on MSL please see techbrief TB363. 2 ...

Page 3

... Test Circuit 1, 15dB Gain 2nd-order Intermodulation Distortion, Test Circuit 1, 15dB Gain 3rd-order Intermodulation Distortion, Test Circuit 1, 15dB Gain Output Voltage Noise DC PERFORMANCE (Internal Nodes) Input Offset Voltage 3 ISL55211 Thermal Information (T = +25°C) A Thermal Resistance (Typical) +0.3V to GND-0. TQFN Package (Notes Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65° ...

Page 4

... CM Input Voltage Range CM Input Impedance POWER SUPPLY Specified Operation Voltage Quiescent Current Power-supply Rejection (PSRR POWER-DOWN (Pin 7) Enable Voltage Threshold Disable Voltage Threshold 4 ISL55211 = +3.3V Test Conditions 12dB CONDITIONS T = -40°C to +85° +25°C, positive current into the pin ...

Page 5

... G FIGURE 2. INTENDED CONFIGURATION 5 ISL55211 = +3.3V Test Conditions 12dB CONDITIONS T = +25° -40°C to +85° 0V, current positive into pin Measured to output on Measured to output off TABLE 1. ISL55211 INTENDED TRANSFORMER + INTERNAL GAIN ISL55211 INPUT 500 XFMR TURNS RATIO + 1:1.4 1:1 1:1.4 1:2 - 1:2 1:2 500 = open, V ...

Page 6

... GAIN = 9dB GAIN = 17dB GAIN = 15dB 5 TEST CIRCUIT # 100 150 200 250 300 FREQUENCY (MHz) FIGURE 7. NOISE FIGURE WITH ADT2-1T INPUT TRANSFORMER 6 ISL55211 ≈ +25°C, unless otherwise noted 3.3V TEST CIRCUIT #1 ...

Page 7

... TEST CIRCUIT 1 GAIN = 15dB -60 HD2 of 100Ω HD2 of 200Ω -70 -80 -90 -100 HD3 of 100Ω HD3 of 50Ω -110 50M 100M FREQUENCY (Hz) FIGURE 13. HD2, HD3 vs DIFFERENTIAL LOAD 7 ISL55211 ≈ +25°C, unless otherwise noted 3.3V -60 HD2 of 3V P-P -70 -80 -90 -100 -110 P-P HD3 of 1V P-P ...

Page 8

... FIGURE 17. SMALL SIGNAL FREQUENCY RESPONSE 200mV P -12 -15 -18 TEST CIRCUIT 3 COMMON MODE AC OUTPUT - FREQUENCY (MHz) FIGURE 19. V PIN INPUT FREQUENCY RESPONSE TO OUTPUT CM COMMON MODE 8 ISL55211 ≈ +25°C, unless otherwise noted 3.3V 1.7 15 TEST CIRCUIT 1 14 WITH ADT2-1T INPUT 1 1 ...

Page 9

... ENABLED ENABLED PD DISABLED DISABLED 2µs/DIV 2µs/DIV FIGURE 23. ENABLE/DISABLE TIMES (2µs/DIV) 2.5 OUTPUT 2.0 1.5 1.0 INPUT 0.5 0 -0.5 -1.0 -1.5 -2.0 TEST CIRCUIT 1 -2 100 TIME (ns) FIGURE 25. OVERDRIVE RECOVERY 9 ISL55211 ≈ +25°C, unless otherwise noted 3.3V 1.5 OUTPUT 1.0 0.5 0 -0 -14.4 -14.6 -14.8 -15.0 -15.2 -15.4 -15.6 -15.8 -16.0 1M TEST CIRCUIT 1 95 ...

Page 10

... SFDR. Where DC-coupled differential I/O operation is desired, the ISL55211 can be connected directly to the source as long as the internal input common mode range limits are observed (1.1V to 1.7V for a 3.3V single supply operation). For a DC-coupled, single to differential requirement, consider the ISL55210. This device is ...

Page 11

... V CM will also appear as the input common mode voltage. This provides a very easy way to control the ISL55211 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 path for an I ...

Page 12

... Converting to just a differential signal at the amplifier Figure 29, removes any input signal related artifacts from the input common mode making the ISL55211 behave as a differential only VFA amplifier. There is only a very small differential error signal at the inputs set by the loop gain ...

Page 13

... Briefly, the I/O and V limits are as follows Maximum V setting = -Vs + Input common mode operating range (internal summing junction pints of the ISL55211) of - output V + 0.5V 3. Output V minimum (on each side) is either - output Output V maximum (on each side ...

Page 14

... Figure shows the analysis model for just the ISL55211 with no input transformer while Table 3 shows the resulting output and input referred differential spot noise voltages using Equation 1. With equal feedback and gain resistors, the total output noise expression becomes very simple. This is shown as Equation 1. ∗ ...

Page 15

... Driving ADC's 500 Many of the intended applications for the ISL55211 are as a low power, very high dynamic range, last stage interface to high R performance ADC's. The lowest power ADC's, such as the F ISLA214P50 shown on the front page, include an innovative " ...

Page 16

... FIGURE 38. AC-COUPLED WITH OUTPUT SIDE TRANSFORMER 4. DC-coupled with ADC V amplifier. Here very high frequency interstage low pass filter can be provided. Again, the R reduce the IR drop from the shows up on the output of the ISL55211, to the ADC input pins ...

Page 17

... Layout Considerations The ISL55211 pinout is organized to isolate signal I/O along one axis of the package with ground, power and control pins on the other axis. Ground and power should be planes coming into the upper and lower sides of the package (see “Pin Configuration” on page 2). The signal I/O should be laid out as tight as possible. ...

Page 18

... DNP Cterm2 2.2pF R1006 R1007 R1008 R1009 R1010 R1011 0ohm/DNP 0ohm/DNP 0ohm/DNP 0ohm/DNP 0ohm/DNP 0ohm/DNP Pd R22 50ohm FIGURE 40. ISL55210, ISL55211 SINGLE INPUT TRANSFORMER EVALUATION BOARD REV C R21 VCC 200ohm/DNP C3 R19 C2 100nf 1k/DNP 100nF TP1 R17 R18 200ohm 50ohm TEST POINT C9 100nf ...

Page 19

... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see 19 ISL55211 www.intersil.com/askourstaff http://rel.intersil.com/reports/search.php For additional products, see www ...

Page 20

... Package Outline Drawing L16.3x3D 16 LEAD THIN QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 0, 3/10 3.00 6 PIN 1 INDEX AREA (4X) 0.15 TOP VIEW (2.80 TYP) ( 1.60) TYPICAL RECOMMENDED LAND PATTERN 20 ISL55211 4X 1.50 A 12X 0. 16X 0.40±0.10 BOTTOM VIEW 0.75 ±0.05 SIDE VIEW (12X 0.50) (16X 0.23 REF C (16X 0.60) DETAIL "X" ...

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