1

Wideband, Low-Power, Ultra-High Dynamic Range

Differential Amplifier

ISL55210

The ISL55210 is a very wide band, Fully Differential Amplifier

(FDA) intended for high dynamic range ADC input interface

applications. This voltage feedback FDA design includes an

independent output common mode voltage control.

Intended for very high dynamic range ADC interface

applications, at the lowest quiescent power (115mW), the

ISL55210 offers a 4.0GHz Gain Bandwidth Product with a very

low input noise of 0.85nV/√(Hz). In a balanced differential I/O

for a gain of 15dB, the IM3 terms are <-100dBc through

110MHz. With a minimum operating gain of 2V/V (6dB), the

ISL55210 supports a wide range of higher gains with minimal

BW or SFDR degradation. Its ultra high differential slew rate of

5,600V/µs ensures clean large signal SFDR performance or a

fast settling step response.

The ISL55210 requires only a single 3.3V (max 4.2V) power

supply with 35mA typical quiescent current. This industry

leading low current solution can be further reduced when

needed using the optional power shutdown to <0.4mA supply

current. External feedback and gain setting resistors give

maximum flexibility and accuracy. A companion device, the

ISL55211, includes on-chip feedback and 3 possible gain

setting connections where an internally fixed gain solution is

preferred. The ISL55210 is available in a leadless, 16 Ld TQFN

package and is specified for operation over the -40ºC to +85ºC

ambient temperature range.

Features

• Gain Bandwidth Product . . . . . . . . . . . . . . . . . . . . . . . . 4.0GHz

• Input Voltage Noise . . . . . . . . . . . . . . . . . . . . . . . 0.85nV/√(Hz)

• Differential Slew Rate . . . . . . . . . . . . . . . . . . . . . . . 5,600V/µs

• 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

• Differential Comms-DAC Output Driver

Related Products

• Coming Soon: ISL55211 - Fixed Gain Version of the

ISL55210

• ISLA112P50 - 12-bit, 500MSPS ADC (<500mW)

• Coming Soon: ISLA214P50 - 14-bit, 500MSPS ADC

(<850mW)

SNRFS = 64.9dBFS

HD2 = -83dBc

HD3 = -84dBc

ENOBFS = 10.5 Bits

FIGURE 1. TYPICAL APPLICATION CIRCUIT

0.1µF

1:2

ISL55210

+3.3V

+

-

Vcm

20pF

20pF

33nH

33nH

V+

V-

ISLA112P50

ADT4-1WT

0.1µF

0.1µF

CLK

500MSPS

105MHz SINGLE TONE

35mA

(115mW)

12 Bit

<500mW

500kHz

= 17.3dB gain

180MHz SPAN

20log (

)

PD

100

50

100

495

495

210

210

40.2

10k

40.2

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

All other trademarks mentioned are the property of their respective owners.

March 2, 2011

FN7811.0