, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1411
Single Supply
14-Bit 2.5Msps ADC
U
DESCRIPTIO
The LTC®1411 is a 2.5Msps sampling 14-bit A/D converter in a 36-pin SSOP package, which typically dissipates only 195mW from a single 5V supply. This device
comes complete with a high bandwidth sample-andhold, a precision reference, programmable input ranges
and an internally trimmed clock. The ADC can be powered
down with either the Nap or Sleep mode for low power
applications.
The LTC1411 converts either differential or single-ended
inputs and presents data in 2’s complement format.
Maximum DC specs include ±2LSB INL and 14-bit no
missing code over temperature. Outstanding dynamic
performance includes 80dB S/(N + D) and 90dB THD at
100kHz input frequency.
The LTC1411 has four programmable input ranges selected by two digital input pins, PGA0 and PGA1. This
provides input spans of ±1.8V, ±1.27V, ±0.9V and ±0.64V.
An out-of-the-range signal together with the D13 (MSB)
will indicate whether a signal is over or under the ADC’s
input range. A simple conversion start input and a data
ready signal ease connections to FIFOs, DSPs and microprocessors.
BLOCK DIAGRA
+
A
IN
1
–
A
IN
2
REFERENCE
5k
5k
X1.62/
X1.15
AGND
2.5V
BANDGAP
2k
AVM
REFOUT
3
REFIN
4
REFCOM1
5
REFCOM2
6
7, 8, 9
W
+
–
INTERNAL
CLOCK
CONTROL LOGIC
NAPSLP
PGA0
10
14-BIT
ADC
AVP
PGA1
30
14
323334353611
DVP
CONVST
OUTPUT
DRIVERS
31
DGND
OV
OGND
D13
BUSY
OTR
DD
29
S/(N + D) and Effective Bits
vs Input Frequency
28
12
•
•
•
D0
25
27
26
1411 BD
86
80
74
68
62
56
50
44
S/(N + D) (dB)
38
32
26
20
14
10
100100010000
INPUT FREQUENCY (kHz)
1411 TA02
14
13
12
11
EFFECTIVE BITS
10
1411f
1
LTC1411
WWWU
ABSOLUTE AXI U RATI GS
AVP = DVP = OV
Supply Voltage (VDD)................................................. 6V
Analog Input Voltage (Note 3) ... – 0.3V to (VDD + 0.3V)
Digital Input Voltage (Note 4) .................. – 0.3V to 10V
Digital Output Voltage............... – 0.3V to (VDD + 0.3V)
Power Dissipation.............................................. 500mW
Operating Temperature Range
LTC1411C ............................................... 0°C to 70°C
LTC1411I............................................ –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Nap ModeNAP = 0V (Note 11)2mA
Sleep ModeSLP = 0V1µA
Power Dissipation●195325mW
Nap ModeNAP = 0V10mW
Sleep ModeSLP = 0V5µW
1411f
3
LTC1411
W
U
TI I G CHARACTERISTICS
range, otherwise specifications are TA = 25°C. (Notes 5) (See Figures 11a, 11b)
SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS
f
SAMPLE(MAX)
t
CONV
t
ACQ
t
0
t
1
t
2
t
3
t
4
t
5
t
6
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, OGND,
AVM and AGND wired together unless otherwise noted.
Note 3: When these pin voltages are taken below AGND or above V
they will be clamped by internal diodes. This product can handle input
currents greater than 100mA without latchup.
Note 4: When these pin voltages are taken below AGND, they will be
clamped by internal diodes. This product can handle input currents greater
than 100mA below AGND without latchup. These pins are not clamped to
V
Note 6: Linearity, offset and full-scale specifications apply for a singleended A
Maximum Sampling Frequency(Note 9)●2.5MHz
Conversion Time●250350ns
Acquisition Time100ns
SLP↑ to CONVST↓ Wake-Up Time10µF Bypass Capacitor at REFCOM2 Pin210ms
NAP↑ to CONVST↓ Wake-Up Time250ns
CONVST Low Time(Note 10)●20ns
CONVST to BUSY DelayCL = 25pF12ns
Data Ready After BUSY↑7ns
CONVST High Time(Note 10)●20ns
Aperture Delay of Sample-and-Hold7ns
= 5V, PGA1 = PGA0 = 5V, f
DD
+
input with A
IN
–
tied to an external 2.5V reference voltage.
IN
= 2.5MHz at 25°C and
SAMPLE
The ● denotes specifications which apply over the full operating temperature
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
DD
,
when the output code flickers between 0000 0000 0000 00 and
1111 1111 1111 11.
Note 9: Recommended operating conditions.
Note 10: The falling CONVST edge 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 within 20ns after
conversion start of after BUSY rises.
Note 11: SLP and NAP have an internal pull-down so the pins will draw
approximately 7µA when tied high and less than 1µA when tied low.
UW
TYPICAL PERFOR A CE CHARACTERISTICS
Signal-to-Noise Ratio
S/(N + D) vs Input Frequency
86
80
74
68
62
56
50
44
S/(N + D) (dB)
38
32
26
20
14
10
100100010000
INPUT FREQUENCY (kHz)
1411 G01
vs Input Frequency
86
80
74
68
62
56
50
SNR (dB)
44
38
32
26
20
14
10
100100010000
INPUT FREQUENCY (kHz)
4
1411 G02
Distortion vs Input Frequency
0
–10
–20
–30
–40
–50
–60
–70
DISTORTION (dB)
–80
–90
–100
–110
10
THD
2ND
3RD
100100010000
INPUT FREQUENCY (kHz)
1411 G03
1411f
UW
VDD (V)
4.5
31.5
SUPPLY CURRENT (mA)
34.0
36.5
39.0
41.5
44.0
46.5
T
A
= 25°C
4.755.05.255.5
1411 G12
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1411
Spurious Free Dynamic Range
vs Input Frequency
0
–10
–20
–30
–40
–50
–60
–70
DISTORTION (dB)
–80
–90
–100
–110
10
100100010000
INPUT FREQUENCY (kHz)
Differential Nonlinearity
vs Output Code
1.0
0.8
0.6
0.4
0.2
0
DNL (LSB)
–0.2
–0.4
–0.6
–0.8
–1.0
4096
0
8192
OUTPUT CODE
12288
1411 G04
16384
1411 G08
S/(N + D) vs Input Frequency
and Amplitude
86
80
74
68
62
56
50
44
SINAD (dB)
38
32
26
20
14
10
100100010000
INPUT FREQUENCY (kHz)
0dB
–20dB
–40dB
Supply Current vs Temperature
45
VDD = 5V
44
43
42
41
40
39
38
SUPPLY CURRENT (mA)
37
36
35
–50
–25
2550
0
TEMPERATURE (°C)
1411 G05
75100
1411 G11
Integral Nonlinearity
vs Output Code
1.0
0.8
0.6
0.4
0.2
0
INL (LSB)
–0.2
–0.4
–0.6
–0.8
–1.0
4096
0
8192
OUTPUT CODE
12288
Supply Current vs Supply Voltage
16384
1411 G07
Histogram for 4096 Conversions
3500
3000
2500
2000
COUNTS
1500
1000
500
0
–1
01
CODE
1411 G13
4096 Points FFT Plot (100kHz)
0
–20
–40
–60
–80
AMPLITUDE (dB)
–100
–120
–140
2505007501250
0
INPUT FREQUENCY (kHz)
SINAD = 78.8dB
SFDR = 95dB
f
= 2.5MHz
SAMPLE
= 100kHz
f
IN
1000
1411 G14
1411f
5
Loading...
+ 11 hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.