LTC1279ISW Linear Technology, LTC1279ISW Datasheet

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LTC1279ISW

Manufacturer Part Number
LTC1279ISW
Description
IC A/DCONV SAMPLNG W/SHTDN24SOIC
Manufacturer
Linear Technology
Datasheet

Specifications of LTC1279ISW

Number Of Bits
12
Sampling Rate (per Second)
600k
Data Interface
Parallel
Number Of Converters
1
Power Dissipation (max)
120mW
Voltage Supply Source
Dual ±
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-SOIC (0.300", 7.50mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
LTC1279IS

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1279ISW
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC1279ISW#PBF
Manufacturer:
LT
Quantity:
1 248
FEATURE
A
TYPICAL
REFERENCE
PPLICATI
OUTPUT
Single Supply 5V or 5V Operation
Sample Rate: 600ksps
70dB S/(N + D) and 74dB THD at Nyquist
Power Dissipation: 60mW Typ
Power Shutdown with Instant Wake-Up
Internal Reference Can Be Overdriven Externally
Internal Synchronized Clock; No Clock Required
High Impedance Analog Input
Input Range: 0V to 5V or 2.5V
New Flexible, Friendly Parallel Interface Eases
Connections to DSPs and FIFOs
24-Pin SO Wide Package
High Speed Data Acquisition
Digital Signal Processing
Multiplexed Data Acquisition Systems
Audio and Telecom Processing
Spectrum Analysis
2.42V
10 F
Single 5V Supply, 600kHz, 12-Bit Sampling A/D Converter
+
S
A
O
PPLICATI
ANALOG INPUT
PARALLEL
U
(0V TO 5V)
0.1 F
12-BIT
S
BUS
10
11
12
1
2
3
4
5
6
7
8
9
O
A
V
AGND
D11(MSB)
D10
D9
D8
D7
D6
D5
D4
DGND
IN
REF
U
LTC1279
CONVST
SHDN
BUSY
AV
DV
V
RD
CS
D0
D1
D2
D3
DD
DD
SS
24
23
22
21
20
19
18
17
16
15
14
13
CONVERSION-START INPUT
POWER SHUTDOWN INPUT
LINES
P CONTROL
10 F
A/D Converter with Shutdown
LTC1279 • TA01
+
D
The LTC
converter which draws only 60mW from a single 5V or
with a 160ns sample-and-hold, a precision reference and
an internally trimmed clock. Unipolar and bipolar conver-
sion modes add to the flexibility of the ADC. The low
power dissipation is reduced even more, drawing only
8.5mW in power shutdown mode. Instant wake-up from
power shutdown allows the converter to be powered
down even during brief inactive periods.
The LTC1279 converts 0V to 5V unipolar inputs from a
single 5V supply and 2.5V bipolar inputs from 5V
supplies. Maximum DC specs include 1LSB INL and
includes 70dB S/(N + D) and 78dB THD at the input
frequency of 100kHz over temperature.
The internal clock is trimmed for 1.4 s conversion time.
The clock automatically synchronizes to each sample
command, eliminating problems with asynchronous clock
noise found in competitive devices. A separate conversion
start input and a data-ready signal (BUSY) ease connec-
tions to FIFOs, DSPs and microprocessors.
5V supplies. This easy-to-use device comes complete
1LSB DNL. Outstanding guaranteed AC performance
5V
ESCRIPTIO
, LTC and LT are registered trademarks of Linear Technology Corporation.
0.1 F
12-Bit, 600ksps Sampling
®
1279 is a 1.4 s, 600ksps, sampling 12-bit A/D
Effective Bits and Signal-to-(Noise + Distortion)
12
11
10
9
8
7
6
5
4
3
2
1
0
U
10k
f
SAMPLE
vs Input Frequency
= 600kHz
FREQUENCY (Hz)
100k
FREQUENCY
NYQUIST
LTC1279
1M
1279 G03
5M
74
68
62
56
50
1

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LTC1279ISW Summary of contents

Page 1

... The clock automatically synchronizes to each sample command, eliminating problems with asynchronous clock noise found in competitive devices. A separate conversion start input and a data-ready signal (BUSY) ease connec- tions to FIFOs, DSPs and microprocessors. , LTC and LT are registered trademarks of Linear Technology Corporation. 5V LTC1279 24 AV ...

Page 2

... OUT(REF) CONDITIONS 4.95V V 5.25V (Unipolar) DD 4.75V V 5.25V, – 5.25V V – 2.45V (Bipolar High Between Conversions (Sample Mode) During Conversions (Hold Mode ORDER TOP VIEW PART NUMBER LTC1279CSW 3 BUSY LTC1279ISW CONVST 7 18 SHDN PACKAGE 24-LEAD PLASTIC SO WIDE = 110 C, = 130 C/W JMAX JA MIN ...

Page 3

ACCURACY SYMBOL PARAMETER S/( Signal-to-Noise Plus Distortion Ratio THD Total Harmonic Distortion First 5 Harmonics Peak Harmonic or Spurious Noise IMD Intermodulation Distortion Full Power Bandwidth Full Linear Bandwidth (S/( 68dB) ...

Page 4

LTC1279 W U POWER REQUIRE E TS SYMBOL PARAMETER V Positive Supply Voltage (Notes 11, 12 Negative Supply Voltage (Note 11, 12 Positive Supply Current DD I Negative Supply Current SS P Power Dissipation D W ...

Page 5

CHARACTERISTICS The indicates specifications which apply over the full operating temperature range; all other limits and typicals T Note 1: Absolute maximum ratings are those values beyond which the life of a device may be ...

Page 6

LTC1279 W U TYPICAL PERFORMANCE CHARACTERISTICS S/( Input Frequency and Amplitude 0dB –20dB –60dB 600kHz SAMPLE 0 10k ...

Page 7

CTIO S A (Pin 1): Analog Input (Unipolar), 2.5V IN (Bipolar). V (Pin 2): 2.42V Reference Output. Bypass to AGND REF (10 F tantalum in parallel with 0.1 F ceramic). AGND (Pin ...

Page 8

LTC1279 TEST CIRCUITS Load Circuits for Access Timing DBN DGND A) HIGH AND DIAGRA ...

Page 9

U U APPLICATIONS INFORMATION pared with the binary-weighted charges supplied by the capacitive DAC. Bit decisions are made by the high speed comparator. At the end of a conversion, the DAC output balances the A input charge. The SAR contents ...

Page 10

LTC1279 U U APPLICATIONS INFORMATION THD = 20log V 1 where V is the RMS amplitude of the fundamental fre- 1 quency and V through V are the amplitudes ...

Page 11

U U APPLICATIONS INFORMATION op amps are used, more settling time can be provided by increasing the time between conversions. Suitable de- vices capable of driving the ADC’s A ® LT 1360, LT1220, LT1223 and LT1224 op amps. Internal Reference ...

Page 12

LTC1279 PPLICATI S I FOR ATIO Unipolar Offset and Full-Scale Error Adjustments In applications where absolute accuracy is important, offset and full-scale errors can be adjusted to zero. Offset error must be adjusted before full-scale error. ...

Page 13

PPLICATI S I FOR ATIO AGND + 3 ANALOG INPUT CIRCUITRY – adequate bypassing for the V pin. The capacitors must SS be located as close to the pins as possible. The traces ...

Page 14

LTC1279 PPLICATI S I FOR ATIO Timing and Control Conversion start and data read operations are controlled by three digital inputs: CS, CONVST and RD. Figure 11 shows the logic structure associated with these inputs. A ...

Page 15

... BUSY t 8 DATA Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights CONV SAMPLE N ...

Page 16

... COMMENTS Single 5V, Sampling 7572 Upgrade Complete with Clock, Reference Complete with Clock, Reference 70dB SINAD at Nyquist, Low Power ADC with Reference, Clock Fast, Complete Low Power ADC Fast, Complete, Wideband ADC LT/GP 0495 10K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1995 ...

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