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LTC1278-4CSW#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
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LTC1278
S
F
EA
T
U
RE
D
U
ESCRIPTIO
The LTC
®
1278 is a 1.6µs, 500ksps, sampling 12-bit A/D
converter that draws only 75mW from a single 5V or ±5V
supplies. This easy-to-use device comes complete with
a 200ns 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 made even more attractive by a
8.5mW power-down feature. Instant wake-up from shut-
down allows the converter to be powered down even
during brief inactive periods.
The LTC1278 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
±1LSB DNL. Outstanding guaranteed AC performance
includes 70dB S/(N + D) and 78dB THD at the input
frequency of 100kHz over temperature.
The internal clock is trimmed for 1.6µs conversion time.
The clock automatically synchronizes to each sample
command, eliminating problems with asynchronous clock
noise found in competitive devices. A separate convert
start input and a data ready signal (BUSY) ease connec-
tions to FIFOs, DSPs and microprocessors.
■
Single Supply 5V or ±5V Operation
■
Two Speed Grades,500ksps (LTC1278-5)
400ksps (LTC1278-4)
■
70dB S/(N + D) and 74dB THD at Nyquist
■
No Missing Codes Over Temperature
■
75mW (Typ) Power Dissipation
■
Power Shutdown with Instant Wake-Up
■
Internal Reference Can Be Overdriven Externally
■
Internal Synchronized Clock; No Clock Required
■
High Impedance Analog Input
■
0V to 5V or ±2.5V Input Range
■
New Flexible, Friendly Parallel Interface to DSPs
and FIFOs
■
24-Pin Narrow PDIP and SW Packages
12-Bit, 500ksps Sampling
A/D Converter with Shutdown
U
A
O
PP
L
IC
AT
ITY
P
I
CA
L
Effective Bits and Signal-to-(Noise + Distortion)
vs Input Frequency
INPUT FREQUENCY (Hz)
10k
0
EFFECTIVE NUMBER OF BITS
S/(N+D) (dB)
3
5
7
10
100k 1M 2M
LT1278 G4
1
4
6
9
12
11
62
56
74
68
8
2
f
SAMPLE
= 500kHz
NYQUIST
FREQUENCY
U
S
A
O
PP
L
IC
AT
I
■
High Speed Data Acquisition
■
Digital Signal Processing
■
Multiplexed Data Acquisition Systems
■
Audio and Telecom Processing
■
Spectrum Analysis
, LTC and LT are registered trademarks of Linear Technology Corporation.
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A
IN
V
REF
AGND
D11(MSB)
D10
D9
D8
D7
D6
D5
D4
DGND
AV
DD
V
SS
BUSY
CS
RD
CONVST
SHDN
DV
DD
D0
D1
D2
D3
LTC1278-5
+
0.1µF
10µF
2.42V
REFERENCE
OUTPUT
ANALOG INPUT
(0V TO 5V)
10µF
0.1µF
5V
12-BIT
PARALLEL
BUS
µP CONTROL
LINES
LTC1278 • TA01
+
CONVERSION START INPUT
POWER DOWN INPUT
Single 5V Supply, 500kHz, 12-Bit Sampling A/D Converter
2
LTC1278
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER
PART NUMBER
AV
DD
= DV
DD
= V
DD
(Notes 1, 2)
Supply Voltage (V
DD
).............................................. 12V
Negative Supply Voltage (V
SS
)
Bipolar Operation Only .......................... –6V to GND
Total Supply Voltage (V
DD
to V
SS
)
Bipolar Operation Only ....................................... 12V
Analog Input Voltage (Note 3)
Unipolar Operation ................... – 0.3V to V
DD
+ 0.3V
Bipolar Operation............... V
SS
– 0.3V to V
DD
+ 0.3V
Digital Input Voltage (Note 4)
Unipolar Operation ................................–0.3V to 12V
Bipolar Operation........................... V
SS
– 0.3V to 12V
Digital Output Voltage
Unipolar Operation ................... –0.3V to V
DD
+ 0.3V
Bipolar Operation................ V
SS
– 0.3V to V
DD
+ 0.3V
Power Dissipation............................................. 500mW
Operating Temperature Range
LTC1278-4C, LTC1278-5C ..................... 0°C to 70°C
LTC1278-4I ....................................... –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
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TOP VIEW
SW PACKAGE
24-LEAD PLASTIC SO WIDE
N PACKAGE
24-LEAD PDIP
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19
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14
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A
IN
V
REF
AGND
D11 (MSB)
D10
D9
D8
D7
D6
D5
D4
DGND
AV
DD
V
SS
BUSY
CS
RD
CONVST
SHDN
DV
DD
D0
D1
D2
D3
T
JMAX
= 110°C, θ
JA
= 100°C/W (N)
T
JMAX
= 110°C, θ
JA
= 130°C/W (SW)
Consult factory for Military grade parts.
LTC1278-4CN
LTC1278-5CN
LTC1278-4IN
LTC1278-4CSW
LTC1278-5CSW
LTC1278-4ISW
LTC1278-4/LTC1278-5
PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution (No Missing Codes) ● 12 Bit
Integral Linearity Error (Note 7) ● ±1 LSB
Differential Linearity Error ● ±1 LSB
Offset Error (Note 8) ±4 LSB
● ±6 LSB
Gain Error ±15 LSB
Gain Error Tempco I
OUT(REF)
= 0 ● ±10 ±45 ppm/°C
CCHARA TERIST
ICS
CO
U
VERTER
With Internal Reference (Notes 5, 6)
LTC1278-4/LTC1278-5
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Analog Input Range (Note 9) 4.95V ≤ V
DD
≤ 5.25V (Unipolar) ● 0 to 5 V
4.75V ≤ V
DD
≤ 5.25V, –5.25V ≤ V
SS
≤ – 2.45V (Bipolar) ● ±2.5 V
I
IN
Analog Input Leakage Current CS = High ● ±1 µA
C
IN
Analog Input Capacitance Between Conversions (Sample Mode) 45 pF
During Conversions (Hold Mode) 5 pF
PUT
U
IA
A
U
LOG
(Note 5)
3
LTC1278
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
S/(N + D) Signal-to-Noise Plus Distortion Ratio 100kHz Input Signal ● 70 72 dB
250kHz Input Signal 70 dB
THD Total Harmonic Distortion 100kHz Input Signal ● –80 –78 dB
First 5 Harmonics 250kHz Input Signal –74 dB
Peak Harmonic or Spurious Noise 100kHz Input Signal ● –84 –78 dB
250kHz Input Signal –74 dB
IMD Intermodulation Distortion f
IN1
= 99.37kHz, f
IN2
= 102.4kHz –82 dB
f
IN1
= 249.37kHz, f
IN2
= 252.4kHz –70 dB
Full Power Bandwidth 4 MHz
Full Linear Bandwidth (S/(N + D) ≥ 68dB) 350 kHz
(Note 5)
LTC1278-4/LTC1278-5
ACCURACY
IC
DY
U
W
A
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
REF
Output Voltage I
OUT
= 0 2.400 2.420 2.440 V
V
REF
Output Tempco I
OUT
= 0 ● ±10 ±45 ppm/°C
V
REF
Line Regulation 4.95V ≤ V
DD
≤ 5.25V 0.01 LSB/V
–5.25V ≤ V
SS
≤ –4.95V 0.01 LSB/V
V
REF
Load Regulation 0V ≤ |I
OUT
| ≤ 1mA 2 LSB/mA
LTC1278-4/LTC1278-5
I TER AL REFERE CE CHARACTERISTICS
U
UU
(Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
High Level Input Voltage V
DD
= 5.25V ● 2.4 V
V
IL
Low Level Input Voltage V
DD
= 4.95V ● 0.8 V
I
IN
Digital Input Current V
IN
= 0V to V
DD
● ±10 µA
C
IN
Digital Input Capacitance 5pF
V
OH
High Level Output Voltage V
DD
= 4.95V
I
O
= –10µA 4.7 V
I
O
= –200µA ● 4V
V
OL
Low Level Output Voltage V
DD
= 4.95V
I
O
= 160µA 0.05 V
I
O
= 1.6mA ● 0.10 0.4 V
I
OZ
High Z Output Leakage D11 to D0 V
OUT
= 0V to V
DD
, CS High ● ±10 µA
C
OZ
High Z Output Capacitance D11 to D0 CS High (Note 9 ) ● 15 pF
I
SOURCE
Output Source Current V
OUT
= 0V –10 mA
I
SINK
Output Sink Current V
OUT
= V
DD
10 mA
LTC1278-4/LTC1278-5
(Note 5)
DIGITAL I PUTS A D DIGITAL OUTPUTS
U
U
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LTC1278-4CSW#PBF

Mfr. #:
Buy LTC1278-4CSW#PBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 12-Bit, 400ksps Sampling A/D Converter with Shutdown
Lifecycle:
New from this manufacturer.
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