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LTC1272-3CCN

Description
12-Bit, 3us, 250kHz Sampling A/D Converter
CategoryAnalog mixed-signal IC    converter   
File Size265KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric Compare View All

LTC1272-3CCN Overview

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

LTC1272-3CCN Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeDIP
package instructionDIP, DIP24,.3
Contacts24
Manufacturer packaging codeN
Reach Compliance Code_compli
ECCN codeEAR99
Maximum analog input voltage15 V
Minimum analog input voltage-0.3 V
Maximum conversion time3000 µs
Converter typeADC, SUCCESSIVE APPROXIMATION
JESD-30 codeR-PDIP-T24
JESD-609 codee0
Maximum linear error (EL)0.0244%
Humidity sensitivity level1
Number of analog input channels1
Number of digits12
Number of functions1
Number of terminals24
Maximum operating temperature70 °C
Minimum operating temperature
Output bit codeBINARY
Output formatPARALLEL, WORD
Package body materialPLASTIC/EPOXY
encapsulated codeDIP
Encapsulate equivalent codeDIP24,.3
Package shapeRECTANGULAR
Package formIN-LINE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
power supply5 V
Certification statusNot Qualified
Sampling rate0.25 MHz
Sample and hold/Track and holdSAMPLE
Maximum seat height3.81 mm
Nominal supply voltage5 V
surface mountNO
technologyBICMOS
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formTHROUGH-HOLE
Terminal pitch2.54 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width7.62 mm
LTC1272
12-Bit, 3µs, 250kHz
Sampling A/D Converter
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
AD7572 Pinout
12-Bit Resolution
3µs and 8µs Conversion Times
On-Chip Sample-and-Hold
Up to 250kHz Sample Rates
5V Single Supply Operation
No Negative Supply Required
On-Chip 25ppm/°C Reference
75mW (Typ) Power Consumption
24-Pin Narrow DIP and SOL Packages
ESD Protected on All Pins
The LTC1272 is a 3µs, 12-bit, successive approximation
sampling A/D converter. It has the same pinout as the
industry standard AD7572 and offers faster conversion
time, on-chip sample-and-hold, and single supply opera-
tion. It uses LTBiCMOS
TM
switched-capacitor technology to
combine a high speed 12-bit ADC with a fast, accurate
sample-and-hold and a precision reference.
The LTC1272 operates with a single 5V supply but can also
accept the 5V/–15V supplies required by the AD7572 (Pin
23, the negative supply pin of the AD7572, is not connected
on the LTC1272). The LTC1272 has the same 0V to 5V input
range as the AD7572 but, to achieve single supply opera-
tion, it provides a 2.42V reference output instead of the
– 5.25V of the AD7572. It plugs in for the AD7572 if the
reference capacitor polarity is reversed and a 1µs sample-
and-hold acquisition time is allowed between conversions.
The output data can be read as a 12-bit word or as two
8-bit bytes. This allows easy interface to both 8-bit and
higher processors. The LTC1272 can be used with a
crystal or an external clock and comes in speed grades of
3µs and 8µs.
LTBiCMOS is a trademark of Linear Technology Corporation
APPLICATI
s
s
s
s
S
High Speed Data Acquisition
Digital Signal Processing (DSP)
Multiplexed Data Acquisition Systems
Single Supply Systems
TYPICAL APPLICATI
2.42V
V
REF
OUTPUT
ANALOG INPUT
(0V TO 5V)
A
IN
V
REF
10µF
AGND
Single 5V Supply, 3µs, 12-Bit Sampling ADC
LTC1272
V
DD
NC
BUSY
CS
RD
HBEN
CLK OUT
CLK IN
D0/8
D1/9
D2/10
D3/11
–120
–140
0
1024 Point FFT, f
S
= 250kHz, f
IN
= 10kHz
5V
0
+
0.1µF
10
µ
F
+
–20
0.1
µ
F
–40
AMPLITUDE (dB)
D11 (MSB)
D10
D9
D8
D7
8 OR 12-BIT
PARALLEL
BUS
D6
D5
D4
DGND
µ
P
CONTROL
LINES
–60
–80
–100
20
LTC1272 • TA01
U
S = 72.1
(N+D)
40
60
80
100
120
LTC1272 • TA02
UO
UO
FREQUENCY (kHz)
1

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