LTC1605-1IG Ver la hoja de datos (PDF) - Linear Technology

Número de pieza

componentes Descripción

Fabricante

LTC1605-1IG

Single Supply 16-Bit, 100ksps, Sampling ADCs

Linear Technology 

LTC1605-1/LTC1605-2

PIN FUNCTIONS

VIN (Pin 1): Analog Input. Connect through a 200Ω

resistor to the analog input. Full-scale input range is 0V

to 4V for the LTC1605-1 and ±4V for the LTC1605-2.

AGND1 (Pin 2): Analog Ground. Tie to analog ground

plane.

REF (Pin 3): 2.5V Reference Output. Bypass with 2.2µF

tantalum capacitor. Can be driven with an external refer-

ence.

CAP (Pin 4): Reference Buffer Output. Bypass with 2.2µF

tantalum capacitor.

AGND2 (Pin 5): Analog Ground. Tie to analog ground

plane.

D15 to D8 (Pins 6 to 13): Three-State Data Outputs.

Hi-Z state when CS is high or when R/C is low.

DGND (Pin 14): Digital Ground.

D7 to D0 (Pins 15 to 22): Three-State Data Outputs.

Hi-Z state when CS is high or when R/C is low.

BYTE (Pin 23): Byte Select. With BYTE low, data will be

output with Pin 6 (D15) being the MSB and Pin 22 (D0)

W

FU CTIO AL BLOCK DIAGRA

being the LSB. With BYTE high the upper eight bits and

the lower eight bits will be switched. The MSB is output

on Pin 15 and bit 8 is output on Pin 22. Bit 7 is output on

Pin 6 and the LSB is output on Pin 13.

R/C (Pin 24): Read/Convert Input. With CS low, a falling

edge on R/C puts the internal sample-and-hold into the

hold state and starts a conversion. With CS low, a rising

edge on R/C enables the output data bits.

CS (Pin 25): Chip Select. Internally OR’d with R/C. With

R/C low, a falling edge on CS will initiate a conversion.

With R/C high, a falling edge on CS will enable the output

data.

BUSY (Pin 26): Output Shows Converter Status. It is low

when a conversion is in progress. Data valid on the rising

edge of BUSY. CS or R/C must be high when BUSY rises

or another conversion will start without time for signal

acquisition.

VANA (Pin 27): 5V Analog Supply. Bypass to ground with

a 0.1µF ceramic and a 10µF tantalum capacitor.

VDIG (Pin 28): 5V Digital Supply. Connect directly to

Pin␣ 27.

4k

6K*

VIN

10k

OPEN*

20k

3.75k*

4k

REF

2.5V REF

REF BUF

CAP

(2.5V)

AGND1

AGND2

DGND

INTERNAL

CLOCK

*RESISTOR VALUES FOR THE LTC1605-2

6

CSAMPLE

CSAMPLE

ZEROING SWITCHES

VANA

VDIG

16-BIT CAPACITIVE DAC

+

COMP

–

16

SUCCESSIVE APPROXIMATION

REGISTER

CONTROL LOGIC

CS

R/C

BYTE BUSY

OUTPUT LATCHES

•••

D15

D0

1605-1/2 BD

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