Frequency (MHz)

0

50 100 150 200 250 300 350 400 450 500 550 600

25

30

35

40

45

50

55

60

D005

Channel A

Channel B

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LMH2832

SBOS709A – JULY 2016 – REVISED JULY 2016

LMH2832 Fully Differential, Dual, 1.1-GHz, Digital Variable-Gain Amplifier

1

1 Features

1

•

Dual-Channel, Individual SPI™-Controlled DVGA

•

Single 5-V Supply

•

–3-dB Bandwidth: 1.1 GHz (Max Gain)

•

Flat Bandwidth Response: 300 MHz

•

Channel-to-Channel Gain Matching: ±0.05 dB

•

Channel-to-Channel Phase Matching: ±0.1°

•

Gain:

–

30 dB to –9 dB

–

1-dB Steps ±0.2 dB

•

Output Third-Order Intercept Point (OIP3):

–

43 dBm at 300 MHz

–

51 dBm at 200 MHz

•

Noise Figure (NF):

–

6.5 dB (Max Gain) at 300 MHz, ZIN = 150 Ω

•

Adjustable Power Consumption:

–

90 mA to 108 mA per Channel

•

Power-Saving, Power-Down Feature:

–

IQ < 4.5 mA per Channel

–

Power-Down Pin and SPI Programmability

•

Input Return Loss at 300 MHz:

–

17 dB (RS = 150 Ω)

2 Applications

•

DOCSIS 3.1 CMTS Upstream Direct Sampling

Receivers

•

CATV Modem Signal Scaling

•

Programmable Gain IF Amplifiers

•

Generic RF, IF Gain Stages

•

ADC Drivers

3 Description

The LMH2832 is a high-linearity, dual-channel, digital

variable-gain amplifier (DVGA) for high-speed signal

chain and data-acquisition systems. The LMH2832 is

optimized to provide high bandwidth, low distortion,

and low noise, thus making the device ideally suited

as a dual, 14-bit, analog-to-digital converter (ADC)

driver. The device consists of one fixed-gain block

and one variable attenuator consisting of a total gain

of 30 dB with a maximum attenuation of 39 dB. The

gain range is from 30 dB to –9 dB in 1-dB gain steps

with a gain accuracy of ±0.2 dB. The input impedance

can be easily matched to 50-Ω or 75-Ω systems using

a 1:3-Ω or 1:2-Ω ratio balun, respectively. The

LMH2832 is designed to drive general-purpose ADCs

and also meets the requirements for both data over

cable service interface specification (DOCSIS) 3.0 32

quadrature amplitude modulation (QAM) carriers and

DOCSIS 3.1 wideband orthogonal frequency-division

multiplexing (OFDM) systems. With excellent NF

(6.5 dB) and linearity, the LMH2832 is designed to

perform

to

within

DOCSIS

specifications.

The

quiescent current in the power-down state is less

than 5 mA per channel with the typical current

consumption during operation at 105 mA per channel.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LMH2832

VQFN (40)

6.00 mm × 6.00 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Output Third-Order Intercept Point (OIP3) Performance