ISL55211

Wideband, Low Noise, Low Distortion, Fixed Gain, Differential Amplifier

Product Status: Mass Production

OVERVIEW

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 VCM pin or left to default to 1.2V above the negative 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 2VP-P 2-tone 3rd order intermodulation. Its 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.

KEY FEATURES

  • 3 Fixed Gain Options: 2, 4, or 5V/V
  • Constant Bandwidth Over Gain: 1.4GHz
  • Differential Slew Rate: 5,600V/µs
  • 2VP-P, 2-tone IM3 (200Ω) 100MHz: -103dBc
  • Low Differential Output Noise (Gain 5V/V): <12nV/√Hz
  • Supply Voltage Range: 3.0V to 4.2V
  • Quiescent Power (3.3V Supply): 115mW

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL55211
Basic Information
Production Status
Mass Production
# of Devices/ Channels
1
Bandwidth (MHz)
1400
Slew Rate (V/μs)
5600
VS (min)
3.3 V
VS (max)
4.2 V
IS (per amp)
35 mA
Noise VN (nV/√Hz)
12
IBIAS
50 µA
Max Offset Voltage
1.4 mV
IOUT
45 mA
VOUT (V)
2.35
Rail-to-Rail Input
No
Rail-to-Rail Output
No
PSRR (dB)
67
CMRR (dB)
75
Thermal Shutdown
No
Gain Min
2
Enable
Yes
Gain Error/Measurment Error Max
0.02
Topology
FDA
Qualification Level
Standard
Can Sample
YES
Temperature Range
-40 to +85

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