LTM9002 datasheet(16/28 Pages) LINER

16 / 28 page

LTM9002

9002f

Figure 1. Basic Functional Elements

Table 1. Semi-Custom Options

AMPLIFIER IF

RANGE

AMPLIFIER INPUT

IMPEDANCE

AMPLIFIER GAIN

FILTER

ADC SAMPLE

RATE

ADC

RESOLUTION

AUXILIARY

DAC

PART NUMBER

300MHz

50Ω

26dB

170MHz LPF

125Msps

14-Bit

12-Bit, SPI

LTM9002-AA

140MHz

200Ω (Channel A)

400Ω (Channel B)

20dB (Channel A)

8dB (Channel B)

25MHz LPF

65Msps

12-Bit

None

LTM9002-LA

Select Combination of Options from Columns Below

DC-300MHz

50Ω

26dB

TBD

125Msps

14-Bit

12-Bit, I2C

DC-140MHz

200Ω

20dB

105Msps

12-Bit

None

DC-70MHz

200Ω

14dB

80Msps

10-Bit

DC-35MHz

400Ω

8dB

65Msps

40Msps

25Msps

10Msps

9002 F01

AMPLIFIER

ADC

INPUT

NETWORK

AUXILIARY

DAC

Description

The LTM9002 is an integrated system in a package (SiP) that

includes two high-speed 14-bit A/D converters, matching

networks, anti-aliasing ﬁlters and two low noise, differen-

tial ampliﬁers with ﬁxed gain. These ampliﬁers need not

be the same, so that the gains and input impedances of

the two channels are different. Also included is a pair of

auxiliary DACs to allow for digital, full-scale adjustment

of each channel. The LTM9002 is designed for digitizing

high frequency, wide dynamic range signals with input

frequencies up to 300MHz. Typical applications include

digitizing in-phase and quadrature channels or main and

diversity channels in base station applications.

The following sections describe in further detail the op-

eration of each section. The SiP technology allows the

LTM9002 to be customized and this is described in the

ﬁrst section. The outline of the remaining sections follows

the basic functional elements as shown in Figure 1.

Semi-Custom Options

The μModule construction affords a new level of ﬂexibility

in application-speciﬁc standard products. Standard ADC

and ampliﬁer components can be integrated regardless

of their process technology and matched with passive

components to a particular application. The LTM9002-AA,

as the ﬁrst example, is conﬁgured with a dual 14-bit ADC

sampling at rates up to 125Msps. The ampliﬁer gain is

26dB with an input impedance of 50Ω and an input range

of 100mVP-P(–16dBm).Thematchingnetworkisdesigned

to optimize the interface between the ampliﬁer output

and the ADC under these conditions. Additionally, there

is a 3rd order lowpass ﬁlter with a cutoff at 170MHz. The

auxiliary DACs allow adjustment of the full-scale range

with 12-bit resolution.

However, other options are possible through Linear

Technology’s semi-custom development program. Linear

Technology has in place a program to deliver other speed,

resolution, IF range, gain and ﬁlter conﬁgurations for nearly

any speciﬁed application. These semi-custom designs are

based on existing ADCs and ampliﬁers with an appropriately

modiﬁed matching network. The ﬁnal subsystem is then

tested to the exact parameters deﬁned for the application.

The ﬁnal result is a fully integrated, accurately tested and

optimized solution in the same package. For more details

on the semi-custom receiver subsystem program, contact

Linear Technology.

OPERATION

LTM9002 Datasheet(PDF) 16 Page - Linear Technology

LTM9002 Datasheet(HTML) 16 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Datasheet Download

Link URL