LTC1272 Просмотр технического описания (PDF) - Linear Technology

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LTC1272

12-Bit, 3µs, 250kHz Sampling A/D Converter

Linear Technology 

LTC1272

PI FU CTI S

AIN (Pin 1): Analog Input, 0V to 5V Unipolar Input.

VREF (Pin 2): 2.42V Reference Output. When plugging into

an AD7572 socket, reverse the reference bypass capacitor

polarity and short the 10Ω series resistor.

AGND (Pin 3): Analog Ground.

D11 to D4 (Pins 4-11): Three-State Data Outputs.

HBEN (Pin 19): High Byte Enable Input. This pin is used to

multiplex the internal 12-bit conversion result into the

lower bit outputs (D7 to D0/8). See table below. HBEN also

disables conversion starts when HIGH.

RD (Pin 20): Read Input. This active low signal starts a

conversion when CS and HBEN are low. RD also enables

the output drivers when CS is low.

DGND (Pin 12): Digital Ground.

D3/11 to D0/8 (Pins 13-16): Three-State Data Outputs.

CLK IN (Pin 17): Clock Input. An external TTL/CMOS

compatible clock may be applied to this pin or a crystal can

be connected between CLK IN and CLK OUT.

CLK OUT (Pin 18): Clock Output. An inverted CLK IN signal

appears at this pin.

CS (Pin 21): The Chip Select Input must be low for the ADC

to recognize RD and HBEN inputs.

BUSY (Pin 22): The BUSY Output is low when a conver-

sion is in progress.

NC (Pin 23): Not Connected Internally. The LTC1272 does

not require negative supply. This pin can accommodate

the –15V required by the AD7572 without problems.

VDD (Pin 24): Positive Supply, 5V.

Data Bus Output, CS and RD = LOW

Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9 Pin 10 Pin 11 Pin 13 Pin 14 Pin 15 Pin 16

MNEMONIC*

D11

D10

D9

D8

D7

D6

D5

D4 D3/11 D2/10 D1/9 D0/8

HBEN = LOW

DB11 DB10 DB9

DB8 DB7 DB6

DB5

DB4 DB3 DB2 DB1

DB0

HBEN = HIGH

DB11 DB10 DB9

DB8 LOW LOW LOW LOW DB11 DB10 DB9

DB8

*D11...D0/8 are the ADC data output pins.

DB11...DB0 are the 12-bit conversion results, DB11 is the MSB.

TYPICAL PERFOR A CE CHARACTERISTICS

Integral Nonlinearity

1.0

VDD = 5V

fCLK = 4MHz

0.5

0

– 0.5

–1.0

0

512 1024 1536 2048 2560 3072 3584 4096

CODE

LTC1272 • TPC01

1272fb

5

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