1
LTC1419
14-Bit, 800ksps Sampling
A/D Converter with Shutdown
S
FEATURE
s
Sample Rate: 800ksps
s
Power Dissipation: 150mW
s
81.5dB S/(N + D) and 93dB THD
s
No Missing Codes
s
No Pipeline Delay
s
Nap and Sleep Shutdown Modes
s
Operates with 2.5V Internal 15ppm/
C
Reference or External Reference
s
True Differential Inputs Reject Common Mode Noise
s
20MHz Full-Power Bandwidth Sampling
s
Bipolar Input Range:
2.5V
s
28-Pin SSOP and SO Packages
D
U
ESCRIPTIO
The LTC
1419 is a 1
s, 800ksps, 14-bit sampling
A/D converter that draws only 150mW from
5V supplies.
This easy-to-use device includes a high dynamic range
sample-and-hold and a precision reference. Two digitally
selectable power shutdown modes provide flexibility for
low power systems.
The LTC1419 has a full-scale input range of
2.5V. Out-
standing AC performance includes 81.5dB S/(N + D) and
93dB THD with a 100kHz input; 80dB S/(N + D) and 86dB
THD at the Nyquist input frequency of 400kHz.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 20MHz
bandwidth. The 60dB common mode rejection allows
users to eliminate ground loops and common mode noise
by measuring signals differentially from the source.
The ADC has a
P compatible, 14-bit parallel output port.
There is no pipeline delay in the conversion results. A
separate convert start input and data ready signal (BUSY)
ease connections to FIFOs, DSPs and microprocessors.
U
S
A
O
PPLICATI
s
Telecommunications
s
Digital Signal Processing
s
Multiplexed Data Acquisition Systems
s
High Speed Data Acquisition
s
Spectrum Analysis
s
Imaging Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
A
O
PPLICATI
TYPICAL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
+A
IN
A
IN
V
REF
REFCOMP
AGND
D13(MSB)
D12
D11
D10
D9
D8
D7
D6
DGND
AV
DD
DV
DD
V
SS
BUSY
CS
CONVST
RD
SHDN
D0
D1
D2
D3
D4
D5
LTC1419
10
F
1
F
DIFFERENTIAL
ANALOG INPUT
(2.5V TO 2.5V)
10
F
10
F
5V
5V
14-BIT
PARALLEL
BUS
P CONTROL
LINES
1419 TA01
V
REF
OUTPUT
2.50V
800kHz, 14-Bit Sampling A/D Converter
INPUT FREQUENCY (Hz)
EFFECTIVE BITS
S/(N + D) (dB)
10k
100k
1M 2M
1419 TA02
1k
14
13
12
11
10
9
8
7
6
5
4
3
2
86
80
74
68
62
f
SAMPLE
= 800kHz
Effective Bits and Signal-to-(Noise + Distortion)
vs Input Frequency
2
LTC1419
AV
DD
= V
DD
= DV
DD
(Notes 1, 2)
Supply Voltage (V
DD
) ................................................ 6V
Negative Supply Voltage (V
SS
)................................ 6V
Total Supply Voltage (V
DD
to V
SS
) .......................... 12V
Analog Input Voltage (Note 3)
......................................... (V
SS
0.3V) to (V
DD
+ 0.3V)
Digital Input Voltage (Note 4) ......... (V
SS
0.3V) to 10V
Digital Output Voltage ........ (V
SS
0.3V) to (V
DD
+ 0.3V)
Power Dissipation ............................................. 500mW
Operating Temperature Range
LTC1419C............................................... 0
C to 70
C
LTC1419I ........................................... 40
C to 85
C
Storage Temperature Range ................ 65
C to 150
C
Lead Temperature (Soldering, 10 sec)................. 300
C
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
W
U
U
PACKAGE/ORDER I FOR ATIO
ORDER
PART NUMBER
C
C
HARA TERISTICS
CO
U
VERTER
With Internal Reference (Notes 5, 6)
Consult factory for Military grade parts.
T
JMAX
= 110
C,
JA
= 95
C/W (G)
T
JMAX
= 110
C,
JA
= 130
C/W (SW)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
+A
IN
A
IN
V
REF
REFCOMP
AGND
D13(MSB)
D12
D11
D10
D9
D8
D7
D6
DGND
AV
DD
DV
DD
V
SS
BUSY
CS
CONVST
RD
SHDN
D0
D1
D2
D3
D4
D5
SW PACKAGE
28-LEAD PLASTIC SO WIDE
G PACKAGE
28-LEAD PLASTIC SSOP
TOP VIEW
LTC1419ACG
LTC1419ACSW
LTC1419AIG
LTC1419AISW
LTC1419CG
LTC1419CSW
LTC1419IG
LTC1419ISW
LTC1419
LTC1419A
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Resolution (No Missing Codes)
q
13
14
Bits
Integral Linearity Error
(Note 7)
q
0.8
2
0.6
1.25
LSB
Differential Linearity Error
q
0.7
1.5
0.5
1
LSB
Offset Error
(Note 8)
q
5
20
5
20
LSB
Full-Scale Error
Internal Reference
10
60
10
60
LSB
External Reference = 2.5V
5
5
LSB
Full-Scale Tempco
I
OUT(REF)
= 0
15
15
ppm/
C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
IN
Analog Input Range (Note 9)
4.75V
V
DD
5.25V, 5.25
V
SS
4.75V
q
2.5
V
I
IN
Analog Input Leakage Current
CS = High
q
1
A
C
IN
Analog Input Capacitance
Between Conversions
15
pF
During Conversions
5
pF
t
ACQ
Sample-and-Hold Acquisition Time
q
90
300
ns
t
AP
Sample-and-Hold Aperture Delay Time
1.5
ns
t
jitter
Sample-and-Hold Aperture Delay Time Jitter
2
ps
RMS
CMRR
Analog Input Common Mode Rejection Ratio
2.5V < ( A
IN
= A
IN
) < 2.5V
60
dB
PUT
U
I
A
A
U
LOG
(Note 5)
3
LTC1419
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
DD
Positive Supply Voltage
(Notes 10, 11)
4.75
5.25
V
V
SS
Negative Supply Voltage
(Note 10)
4.75
5.25
V
I
DD
Positive Supply Current
q
11
20
mA
Nap Mode
SHDN = 0V, CS = 0V
1.5
mA
Sleep Mode
SHDN = 0V, CS = 5V
250
A
I
SS
Negative Supply Current
q
19
30
mA
Nap Mode
SHDN = 0V, CS = 0V
100
A
Sleep Mode
SHDN = 0V, CS = 5V
1
A
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
S/(N + D)
Signal-to-(Noise + Distortion) Ratio
100kHz Input Signal
q
78
81.5
dB
390kHz Input Signal
80.0
dB
THD
Total Harmonic Distortion
100kHz Input Signal, First 5 Harmonics
q
93
86
dB
390kHz Input Signal, First 5 Harmonics
86
dB
SFDR
Spurious Free Dynamic Range
100kHz Input Signal
q
95
86
dB
IMD
Intermodulation Distortion
f
IN1
= 29.37kHz, f
IN2
= 32.446kHz
86
dB
Full-Power Bandwidth
20
MHz
Full-Linear Bandwidth
S/(N + D)
77dB
1
MHz
(Note 5)
ACCURACY
IC
DY
U
W
A
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
REF
Output Voltage
I
OUT
= 0
2.480
2.500
2.520
V
V
REF
Output Tempco
I
OUT
= 0
15
ppm/
C
V
REF
Line Regulation
4.75V
V
DD
5.25V, 5.25
V
SS
4.75V
0.05
LSB/V
V
REF
Output Resistance
0.1mA
I
OUT
0.1mA
2
k
REFCOMP Output Voltage
I
OUT
= 0
4.06
V
(Note 5)
I TER AL REFERE CE CHARACTERISTICS
U
U
U
DIGITAL I PUTS A D DIGITAL OUTPUTS
U
U
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
IH
High Level Input Voltage
V
DD
= 5.25V
q
2.4
V
V
IL
Low Level Input Voltage
V
DD
= 4.75V
q
0.8
V
I
IN
Digital Input Current
V
IN
= 0V to V
DD
q
10
A
C
IN
Digital Input Capacitance
5
pF
V
OH
High Level Output Voltage
V
DD
= 4.75V
I
O
= 10
A
4.5
V
I
O
= 200
A
q
4.0
V
V
OL
Low Level Output Voltage
V
DD
= 4.75V
I
O
= 160
A
0.05
V
I
O
= 1.6mA
q
0.10
0.4
V
I
OZ
Hi-Z Output Leakage D13 to D0
V
OUT
= 0V to V
DD
, CS High
q
10
A
C
OZ
Hi-Z Output Capacitance D13 to D0
CS High (Note 9 )
q
15
pF
I
SOURCE
Output Source Current
V
OUT
= 0V
10
mA
I
SINK
Output Sink Current
V
OUT
= V
DD
10
mA
POWER REQUIRE E TS
W U
(Note 5)
(Note 5)
4
LTC1419
Note 6: Linearity, offset and full-scale specifications apply for a single-
ended +A
IN
input with A
IN
grounded.
Note 7: Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.
Note 8: Bipolar offset is the offset voltage measured from 0.5LSB
when the output code flickers between 0000 0000 0000 00 and
1111 1111 1111 11.
Note 9: Guaranteed by design, not subject to test.
Note 10: Recommended operating conditions.
Note 11: The falling edge of CONVST starts a conversion. If CONVST
returns high at a critical point during the conversion it can create small
errors. For best performance ensure that CONVST returns high either
within 650ns after the start of the conversion or after BUSY rises.
(Note 5)
TI I G CHARACTERISTICS
W U
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
P
DIS
Power Dissipation
q
150
240
mW
Nap Mode
SHDN = 0V, CS = 0V
7.5
12
mW
Sleep Mode
SHDN = 0V, CS = 5V
1.2
mW
POWER REQUIRE E TS
W U
(Note 5)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
f
SAMPLE(MAX)
Maximum Sampling Frequency
q
800
kHz
t
CONV
Conversion Time
q
950
1150
ns
t
ACQ
Acquisition Time
q
90
300
ns
t
ACQ + CONV
Acquisition + Conversion Time
q
1040
1250
ns
t
1
CS to RD Setup Time
(Notes 9, 10)
q
0
ns
t
2
CS
to CONVST
Setup Time
(Notes 9, 10)
q
40
ns
t
3
CS
to SHDN
Setup Time
(Notes 9, 10)
40
ns
t
4
SHDN
to CONVST
Wake-Up Time
(Note 10)
400
ns
t
5
CONVST
Low Time
(Notes 10, 11)
q
40
ns
t
6
CONVST to BUSY Delay
C
L
= 25pF
20
ns
q
50
ns
t
7
Data Ready Before BUSY
20
50
ns
q
15
ns
t
8
Delay Between Conversions
(Note 10)
q
40
ns
t
9
Wait Time RD
After BUSY
q
5
ns
t
10
Data Access Time After RD
C
L
= 25pF
15
25
ns
q
35
ns
C
L
= 100pF
20
35
ns
q
50
ns
t
11
Bus Relinquish Time
10
20
ns
0
C
T
A
70
C
q
25
ns
40
C
T
A
85
C
q
30
ns
t
12
RD Low Time
q
t
10
ns
t
13
CONVST High Time
q
40
ns
The
q
denotes specifications which apply over the full operating
temperature range; all other limits and typicals T
A
= 25
C.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All voltage values are with respect to ground with DGND and
AGND wired together unless otherwise noted.
Note 3: When these pin voltages are taken below V
SS
or above V
DD
, they
will be clamped by internal diodes. This product can handle input currents
greater than 100mA below V
SS
or above V
DD
without latchup.
Note 4: When these pin voltages are taken below V
SS
, they will be clamped
by internal diodes. This product can handle input currents greater than
100mA below V
SS
without latchup. These pins are not clamped
to V
DD
.
Note 5: V
DD
= 5V, f
SAMPLE
= 800kHz, t
r
= t
f
= 5ns unless otherwise
specified.
5
LTC1419
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
S/(N + D) vs Input Frequency
and Amplitude
Distortion vs Input Frequency
Spurious-Free Dynamic Range
vs Input Frequency
Differential Nonlinearity
vs Output Code
Integral Nonlinearity
vs Output Code
Input Common Mode Rejection
vs Input Frequency
INPUT FREQUENCY (Hz)
SIGNAL/(NOISE + DISTORTION) (dB)
90
80
70
60
50
40
30
20
10
0
1k
100k
1M
2M
1419 G01
10k
V
IN
= 0dB
V
IN
= 20dB
V
IN
= 60dB
INPUT FREQUENCY (Hz)
AMPLITUDE (dB BELOW THE FUNDAMENTAL)
0
10
20
30
40
50
60
70
80
90
100
110
1419 G03
THD
2ND
3RD
1k
100k
1M
2M
10k
Signal-to-Noise Ratio
vs Input Frequency
INPUT FREQUENCY (Hz)
SIGNAL-TO -NOISE RATIO (dB)
1k
0
90
80
70
60
50
40
30
20
10
1419 G02
100k
1M
2M
10k
Intermodulation Distortion Plot
INPUT FREQUENCY (Hz)
10k
SPURIOUS-FREE DYNAMIC RANGE (dB)
0
10
20
30
40
50
60
70
80
90
100
110
100k
1M
2M
1419 G04
FREQUENCY (kHz)
0
120
AMPLITUDE (dB)
100
80
60
40
100
200
300
400
1419 G05
20
0
50
150
250
350
f
SAMPLE
= 800kHz
f
IN1
= 95.8984375kHz
f
IN2
= 104.1015625kHz
OUTPUT CODE
0
1.0
DNL ERROR (LSBs)
0.5
0
0.5
1.0
4096
8192
1419 G06
12288
16384
Power Supply Feedthrough
vs Ripple Frequency
OUTPUT CODE
0
1.0
INL ERROR (LSBs)
0.5
0
0.5
1.0
4096
8192
1419 G07
12288
16384
RIPPLE FREQUENCY (Hz)
AMPLITUDE OF POWER SUPPLY FEEDTHROUGH (dB)
0
10
20
30
40
50
60
70
80
90
100
1k
100k
1M
2M
1419 G08
10k
V
SS
DGND
V
DD
INPUT FREQUENCY (Hz)
1
COMMON MODE REJECTION (dB)
80
70
60
50
40
30
20
10
0
10
100
1419 G09
1000
10000
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