LT1819 datasheet(11/26 Pages) LINER

Part #	LT1819

Description	Dual, 16-Bit, 2Msps Differential Input ADC with Wide Input Common Mode Range

Download	26 Pages

Scroll/Zoom	100%

Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

Logo

11 / 26 page

LTC2321-16

11

232116fc

For more information www.linear.com/LTC2321-16

applicaTions inForMaTion

OVERVIEW

The LTC2321-16 is a low noise, high speed 16-bit succes-

sive approximation register (SAR) ADC with differential

inputs and a wide input common mode range. Operating

from a single 3.3V or 5V supply, the LTC2321-16 has an

8VP-P differential input range, making it ideal for applica-

tions which require a wide dynamic range. The LTC2321-

16 achieves ±4LSB INL typical, no missing codes at 16

bits and 81dB SNR.

The LTC2321-16 has an onboard reference buffer and low

drift (20ppm/°C max) 4.096V temperature-compensated

reference. The LTC2321-16 also has a high speed SPI-

compatible serial interface that supports CMOS or LVDS.

The fast 2Msps per channel throughput with no cycle

latency makes the LTC2321-16 ideally suited for a wide

variety of high speed applications. The LTC2321-16 dis-

sipates only 31mW per channel. Nap and sleep modes

are also provided to reduce the power consumption of

the LTC2321-16 during inactive periods for further power

savings.

CONVERTER OPERATION

The LTC2321-16 operates in two phases. During the

acquisition phase, the sample capacitor is connected to

the analog input pins AIN+ and AIN– to sample the dif-

ferential analog input voltage, as shown in Figure 3. A

falling edge on the CNV pin initiates a conversion. During

the conversion phase, the 16-bit CDAC is sequenced

through a successive approximation algorithm, effectively

comparing the sampled input with binary-weighted frac-

tions of the reference voltage (e.g., VREFOUT/2, VREFOUT/4

… VREFOUT/32768) using the differential comparator. At

the end of conversion, a CDAC output approximates the

sampled analog input. The ADC control logic then pre-

pares the 16-bit digital output code for serial transfer .

The data is clocked out on each falling edge of the SCK+

input clock.

TRANSFER FUNCTION

The LTC2321-16 digitizes the full-scale voltage of 2 ×

REFOUT into 216 levels, resulting in an LSB size of

125µV with REFBUF = 4.096V. The ideal transfer function

is shown in Figure 2. The output data is in 2’s comple-

ment format.

Analog Input

The differential inputs of the LTC2321-16 provide great

flexibility to convert a wide variety of analog signals with

no configuration required. The LTC2321-16 digitizes the

difference voltage between the AIN+ and AIN– pins while

supporting a wide common mode input range. The analog

input signals can have an arbitrary relationship to each

other, provided that they remain between VDD and GND.

The LTC2321-16 can also digitize more limited classes

of analog input signals such as pseudo-differential uni-

polar/bipolar and fully differential with no configuration

required.

Figure 2. LTC2321-16 Transfer Function

Figure 3. The Equivalent Circuit for the Differential

Analog Input of the LTC2321-16

RON

15

RON

15

BIAS

VOLTAGE

232116 F03

CIN

10pF

VDD

CIN

10pF

VDD

AIN1–

AIN1+

INPUT VOLTAGE (V)

–FSR/2

232116 F02

011...111

011...110

111...111

100...000

100...001

000...000

000...001

–1

LSB

FSR = +FS – –FS

1LSB = FSR/65535

0

1

LSB

+FSR/2

–1

Similar Part No. - LT1819

Manufacturer	Part #	Datasheet	Description
Linear Technology	LT1819	223Kb / 16P	1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF
	LT1819	1Mb / 26P	Dual, 16-Bit, 5Msps Differential Input ADC with Wide Input Common Mode Range
	LT1819	984Kb / 20P	14-Bit, 4.5Msps Serial Sampling ADC in TSOT
	LT1819	1Mb / 30P	Quad, 16-Bit, 5Msps/Ch Simultaneous Sampling ADC
	LT1819	911Kb / 20P	12-Bit, 5Msps Serial Sampling ADC in TSOT

More results

Similar Description - LT1819

Manufacturer	Part #	Datasheet	Description
Linear Technology	LTC2321-16	1,012Kb / 26P	Dual, 16-Bit, 2Msps Differential Input ADC with Wide Input Common Mode Range
	LTC2321-12	995Kb / 26P	Dual, 12-Bit Sign, 2Msps Differential Input ADC with Wide Input Common Mode Range
	LTC2321-14	1Mb / 28P	Dual, 14-Bit Sign, 2Msps Differential Input ADC with Wide Input Common Mode Range
	LTC2323-16	1Mb / 26P	Dual, 16-Bit, 5Msps Differential Input ADC with Wide Input Common Mode Range
	LTC2323-16	1Mb / 26P	Dual, 16-Bit, 5Msps Differential Input ADC with Wide Input Common Mode Range
	LTC2311-16	885Kb / 26P	16-Bit, 5Msps Differential Input ADC with Wide Input Common Mode Range
	LTC2323-14	1Mb / 24P	Dual, 14-Bit Sign, 5Msps Differential Input ADC with Wide Input Common Mode Range
	LTC2323-12	1Mb / 24P	Dual, 12-Bit Sign, 5Msps Differential Input ADC with Wide Input Common Mode Range
	LTC2348-16	1Mb / 40P	Octal, 16-Bit, 200ksps Differential 짹10.24V Input SoftSpan ADC with Wide Input Common Mode Range
	LTC2345-16	1Mb / 40P	Octal, 16-Bit, 200ksps Differential SoftSpan ADC with Wide Input Common Mode Range

More results

LT1819 Datasheet(PDF) 11 Page - Linear Technology

LT1819 Datasheet(HTML) 11 Page - Linear Technology

Similar Part No. - LT1819

Similar Description - LT1819

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

Datasheet Download

Link URL