LTC6401-20 - 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF

The LTC6401-20 is a high-speed differential amplifier targeted at processing signals from DC to 140MHz. The part has been specifically designed to drive 12-, 14- and 16-bit ADCs with low noise and low distortion, but can also be used as a general-purpose broadband gain block.

The LTC6401-20 is easy to use, with minimal support circuitry required. The output common mode voltage is set using an external pin, independent of the inputs, which eliminates the need for transformers or AC-coupling capacitors in many applications. The gain is internally fixed at 20dB (10V/V).

The LTC6401-20 saves space and power compared to alternative solutions using IF gain blocks and transformers. The LTC6401-20 is packaged in a compact 16-lead 3mm × 3mm QFN package and operates over the –40°C to 85°C temperature range.

Features

1.3GHz 3dB Bandwidth
Fixed Gain of 10V/V (20dB)
93dBc IMD3 at 70MHz (Equivalent OIP3 = 50.5dBm)
74dBc IMD3 at 140MHz (Equivalent OIP3 = 41dBm)
1nV/√Hz Internal Op Amp Noise
2.1nV/√Hz Total Input Noise
6.2dB Noise Figure
Differential Inputs and Outputs
200 Input Impedance
2.85V to 3.5V Supply Voltage
50mA Supply Current (150mW)
1VΩ to 1.6V Output Common Mode Voltage,
Adjustable
DC- or AC-Coupled Operation
Max Differential Output Swing 4.4VP-P
Small 16-Lead 3mm x 3mm x 0.75mm QFN Package

Typical Application

Applications

Differential ADC Driver
Differential Driver/Receiver
Single Ended to Differential Conversion
IF Sampling Receivers
SAW Filter Interfacing

Packaging

**Order Information**
Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC6401CUD-20#PBF	3x3 QFN-16	C	$4.21	$2.95
LTC6401CUD-20#TRPBF	3x3 QFN-16	C		$3.01
LTC6401IUD-20#PBF	3x3 QFN-16	I	$4.85	$3.40
LTC6401IUD-20#TRPBF	3x3 QFN-16	I		$3.46

Demo Boards


Part Number	Description	Price
DC987B-G	LTC6401-20 3GHz Fully Differential ADC Driver Demo Circuit	$80.00