LTM9002 datasheet(14/32 Pages) LINER

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LTC2159

2159f

FuncTional block DiagraM

CONVERTER OPERATION

The LTC2159 is a low power, 16-bit, 20Msps A/D converter

that is powered by a single 1.8V supply. The analog inputs

should be driven differentially. The encode input can be

driven differentially or single-ended for lower power con-

sumption. The digital outputs can be CMOS, double data

rate CMOS (to halve the number of output lines), or double

data rate LVDS (to reduce digital noise in the system).

Many additional features can be chosen by programming

the mode control registers through a serial SPI port.

Figure 1. Functional Block Diagram

applicaTions inForMaTion

ANALOG INPUT

The analog inputs are differential CMOS sample-and-hold

circuits(Figure2).Theinputsshouldbedrivendifferentially

around a common mode voltage set by the VCM output

pin, which is nominally VDD/2. For the 2V input range,

the inputs should swing from VCM – 0.5V to VCM + 0.5V.

Thereshouldbe180°phasedifferencebetweentheinputs.

DIFF

REF

AMP

REF

BUF

2.2µF

0.1µF

CLOCK/DUTY

CYCLE

CONTROL

RANGE

SELECT

1.25V

REFERENCE

ENC+

REFH

REFL

ENC–

SDO

OGND

OVDD

D15

CLKOUT–

CLKOUT+

2159 BD

SENSE

VREF

2.2µF

VCM

0.1µF

VDD/2

MODE

CONTROL

REGISTERS

OUTPUT

DRIVERS

SCK

PAR/SER

SDI

•

REFL INTERNAL CLOCK SIGNALS

REFH

S/H

ANALOG

INPUT

16-BIT

ADC CORE

CORRECTION

LOGIC

VDD

GND

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