ADA4937-2 Ultralow Distortion Differential ADC Driver (Dual)

ADC drivers Single-ended-to-differential converters IF and baseband gain blocks Differential buffers Line drivers

The ADA4937-1 / ADA4937-2 are low noise, ultralow distortion, high speed differential amplifiers. They are an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 100 MHz. The adjustable level of the output common mode allows the ADA4937-1/ADA4937-2 to match the input of the ADC. The internal common-mode feedback loop also provides exceptional output balance as well as suppression of even-order harmonic distortion products.

With the ADA4937-1 / ADA4937-2, differential gain configurations are easily realized with a simple external feedback network of four resistors that determine the closed-loop gain of the amplifier.

The ADA4937-1 / ADA4937-2 are fabricated using Analog Devices, Inc., proprietary silicon-germanium (SiGe), complementary bipolar process, enabling them to achieve very low levels of distortion with an input voltage noise of only 2.2 nV/√Hz. The low dc offset and excellent dynamic performance of the ADA4937-1/ADA4937-2 make them well-suited for a wide variety of data acquisition and signal processing applications.

The ADA4937-1 / ADA4937-2 are available in a Pb-free, 3 mm × 3 mm, 16-lead LFCSP (ADA4937-1, single) or a Pb-free, 4 mm × 4 mm, 24-lead LFCSP (ADA4937-2, dual). The pinout has been optimized to facilitate PCB layout and minimize distortion. The ADA4937-1 / ADA4937-2 are specified to operate over the automotive (−40°C to +105°C) temperature range and between 3.3 V and 5 V supplies.

Applications

Features and Benefits

Extremely low harmonic distortion (HD)

−112 dBc HD2 at 10 MHz
−84 dBc HD2 at 70 MHz
−77 dBc HD2 at 100 MHz
−102 dBc HD3 at 10 MHz
−91 dBc HD3 at 70 MHz
−84 dBc HD3 at 100 MHz

−112 dBc HD2 at 10 MHz

−84 dBc HD2 at 70 MHz

−77 dBc HD2 at 100 MHz

−102 dBc HD3 at 10 MHz

−91 dBc HD3 at 70 MHz

−84 dBc HD3 at 100 MHz

Low input voltage noise: 2.2 nV/√Hz

High speed

−3 dB bandwidth of 1.9 GHz, G = 1
Slew rate: 6000 V/μs, 25% to 75%
Fast overdrive recovery of 1 ns

−3 dB bandwidth of 1.9 GHz, G = 1

Slew rate: 6000 V/μs, 25% to 75%

Fast overdrive recovery of 1 ns

0.5 mV typical offset voltage

Externally adjustable gain

Differential-to-differential or single-ended-to-differential

operation

Adjustable output common-mode voltage

Single-supply operation: 3.3 V to 5 V

Amplifiers

SPICE Models

ADA4937 SPICE Macro Model .CIR

Data Sheets

Document	note
ADA4937-1/ADA4937-2: Ultralow Distortion Differential ADC Driver Data Sheet (Rev. F)	PDF 583.97 K

Application Notes

Document	note
AN-1363: Meeting Biasing Requirements of Externally Biased RF/Microwave Amplifiers with Active Bias Controllers (Rev. 0)	PDF 804.11 K
AN-282: Fundamentals of Sampled Data Systems	PDF 2131 kB
AN-0990: Terminating a Differential Amplifier in Single-Ended Input Applications (Rev. 0)	PDF 181 kB
AN-0992: Active Filter Evaluation Board for Differential Amplifiers (Rev. 0)	PDF 85 kB
AN-1026: High Speed Differential ADC Driver Design Considerations (Rev. A)	PDF 355 kB
AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0)	PDF 5.3 M

User Guides

Document	note
UG-018: Evaluation Board for Dual High Speed Differential Amplifiers	PDF 314 kB

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
ADA4937-2YCPZ-R2 Production	24 ld LFCSP (4x4x.75mm w/2.10mm EP)	REEL 250	-40 to 105C	7.69	7.69	Y
ADA4937-2YCPZ-R7 Production	24 ld LFCSP (4x4x.75mm w/2.10mm EP)	REEL 1500	-40 to 105C	0	5.69	Y
ADA4937-2YCPZ-RL Production	24 ld LFCSP (4x4x.75mm w/2.10mm EP)	REEL 5000	-40 to 105C	0	5.69	Y