LTC1098AC datasheet(22/28 Pages) LINER

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LTC1096/LTC1096L

LTC1098/LTC1098L

APPLICATI

I FOR ATIO

Effective Number of Bits

The effective number of bits (ENOBs) is a measurement of

the resolution of an A/D and is directly related to the

S/(N + D) by the equation:

ENOB = [S/(N + D) –1.76]/6.02

where S/(N + D) is expressed in dB. At the maximum

sampling rate of 33kHz the LTC1096 maintains 7.5 ENOBs

or better to 40kHz. Above 40kHz the ENOBs gradually

decline, as shown in Figure 12, due to increasing second

harmonic distortion. The noise floor remains approxi-

mately 70dB.

Figure 12. Dynamic Accuracy Is Maintained Up to an Input

Frequency of 40kHz

INPUT FREQUENCY (kHz)

LTC1096/8 • F12

fSAMPLE = 31.25kHz

APPLICATI

TYPICAL

MICROPROCESSOR INTERFACES

The LTC1096(L)/LTC1098(L) can interface directly (with-

out external hardware to most popular microprocessor

(MPU) synchronous serial formats (see Table 1). If an

MPU without a dedicated serial port is used, then three or

four of the MPU’s parallel port lines can be programmed

to form the serial link to the LTC1096(L)/LTC1098(L).

Included here is one serial interface example and one

example showing a parallel port programmed to form the

serial interface.

Motorola SPI (MC68HC05C4,CM68HC11)

The MC68HC05C4 has been chosen as an example of

an MPU with a dedicated serial port. This MPU transfer

data MSB-first and in 8-bit increments. With two 8-bit

transfers, the A/D result is read into the MPU. The first

8-bit transfer sends the DIN word to the LTC1098(L)

and clocks into the processor. The second 8-bit trans-

fer clocks the A/D conversion result, B7 through B0,

into the MPU.

ANDing the first MUP received byte with 00Hex clears the

first byte. Notice how the position of the start bit in the first

MPU transmit word is used to position the A/D result

right-justified in two memory locations.

Table 1. Microprocessor with Hardware Serial Interfaces

Compatible with the LTC1096(L)/LTC1098(L)

*Requires external hardware

MICROWIRE and MICROWIRE/PLUS are trademarks of

National Semiconductor Corp.

PART NUMBER

TYPE OF INTERFACE

Motorola

MC6805S2,S3

SPI

MC68HC11

SPI

MC68HC05

SPI

RCA

CDP68HC05

SPI

Hitachi

HD6305

SCI Synchronous

HD63705

SCI Synchronous

HD6301

SCI Synchronous

HD63701

SCI Synchronous

HD6303

SCI Synchronous

HD64180

CSI/O

National Semiconductor

COP400 Family

MICROWIRE

COP800 Family

MICROWIRE/PLUS

NS8050U

MICROWIRE/PLUS

HPC16000 Family

MICROWIR/PLUS

Texas Instruments

TMS7002

Serial Port

TMS7042

Serial Port

TMS70C02

Serial Port

TMS70C42

Serial Port

TMS32011*

Serial Port

TMS32020

Serial Port

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