LINEAR TECHNOLOGY LTC1411 Technical data

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FEATURES
Sample Rate: 2.5Msps
80dB S/(N + D) and 90dB THD at 100kHz f
Single 5V Operation
No Pipeline Delay
Programmable Input Ranges
Low Power Dissipation: 195mW (Typ)
True Differential Inputs Reject Common Mode Noise
Out-of-Range Indicator
Internal or External Reference
Sleep (1µA) and Nap (2mA) Shutdown Modes
36-Pin SSOP Package
IN
U
APPLICATIO S
Telecommunications
High Speed Data Acquisition
Digital Signal Processing
Multiplexed Data Acquisition Systems
Spectrum Analysis
Imaging Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1411
Single Supply
14-Bit 2.5Msps ADC
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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
100 1000 10000
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
= VDD (Notes 1, 2)
DD
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PACKAGE/ORDER I FOR ATIO
A
IN
A
IN
REFOUT
REFIN REFCOM1 REFCOM2
AGND1 AGND2 AGND3
AVP
AVM
D13 (MSB)
D12 D11 D10
D9 D8 D7
TOP VIEW
+
1
2 3 4 5 6 7 8
9 10 11 12 13 14 15 16 17 18
G PACKAGE
36-LEAD PLASTIC SSOP
T
= 125°C, θJA = 95°C/W
JMAX
36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19
SLP NAP PGA0 PGA1 CONVST DGND DVP OV
DD
OGND BUSY OTR D0 D1 D2 D3 D4 D5 D6
ORDER PART
NUMBER
LTC1411CG LTC1411IG
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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CO VERTER CHARACTERISTICS
temperature range, otherwise specifications are TA = 25°C. (Notes 5, 6)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution (No Missing Codes) 14 Bits Integral Linearity Error (Note 7) ±2 LSB Offset Error (Note 8) ±16 LSB
Full-Scale Error External Reference = 2.5V ±60 LSB Full-Scale Tempco I
W
U
IC
DY
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
S/(N + D) Signal-to-Noise Plus Distortion Ratio 100kHz Input Signal 80.0 dB
THD Total Harmonic Distortion 100kHz Input Signal, Up to 5th Harmonic –90 dB
A
Peak Harmonic or Spurious Noise 100kHz Input Signal 90 dB
Full Linear Bandwidth S/(N + D) 74dB 1.0 MHz Transition Noise 0.66 LSB
ACCURACY
TA = 25°C (Note 5)
OUT(REF)
500kHz Input Signal 77.5 dB
500kHz Input Signal, Up to 5th Harmonic –82 dB
500kHz Input Signal 82 dB
The denotes specifications which apply over the full operating
±24 LSB
= 0 ±15 ppm/°C
RMS
2
1411f
LTC1411
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A ALOG I PUT
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
C
IN
t
ACQ
t
AP
t
jitter
CMRR Analog Input Common Mode Rejection Ratio 0V < (A
Analog Input Range (Note 9) (A
Common Mode Input Range A Analog Input Capacitance Between Conversions (Sample Mode) 10 pF
Sample-and-Hold Acquisition Time 100 ns Sample-and-Hold Aperture Delay Time 7 ns Sample-and-Hold Aperture Delay Time Jitter 1 ps
Input Leakage Current (Pins 1, 2) 0.1 µA
TA = 25°C (Note 5)
+
) – (A
IN
+
(A
IN
+
(A
IN
+
(A
IN
+
or A
IN
During Conversions (Hold Mode) 4 pF
), PGA0 = PGA1 = 5V ±1.8 V
IN
) – (A
), PGA0 = 5V, PGA1 = 0V ±1.27 V
IN
) – (A
), PGA0 = 0V, PGA1 = 5V ±0.9 V
IN
) – (A
), PGA0 = PGA1 = 0V ±0.64 V
IN –
IN
+
= A
IN
) < V
IN
DD
0V
62 dB
DD
RMS
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I TER AL REFERE CE CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
Output Voltage I
REF
V
Output Tempco I
REF
V
Line Regulation 4.75V ≤ VDD 5.25V 0.01 LSB/V
REF
V
Load Regulation 0 I
REF
REFCOM2 Output Voltage I REFIN Input Current REFIN = External Reference 2.5V 250 µA
= 0 2.480 2.500 2.520 V
OUT
= 0 ±15 ppm/°C
OUT
≤ 1mA 2 LSB/mA
OUT
= 0, PGA0 = PGA1 = 5V 4.05 V
OUT
TA = 25°C (Note 5)
V
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DIGITAL I PUTS A D DIGITAL OUTPUTS
The denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
V
IL
I
IN
C
IN
V
OH
V
OL
I
SOURCE
I
SINK
High Level Input Voltage V Low Level Input Voltage VDD = 4.75V 0.8 V Digital Input Current VIN = 0V to VDD, Except SLP, NAP (Note 11) ±10 µA Digital Input Capacitance 2pF High Level Output Voltage VDD = 4.75V, IO = –10µA 4.75 V
Low Level Output Voltage VDD = 4.75V, IO = 160µA 0.05 V
Output Source Current V Output Sink Current V
= 5.25V 2.4 V
DD
VDD = 4.75V, IO = –200µA 4.0 V
VDD = 4.75V, IO = 1.6mA 0.10 0.4 V
= 0V –10 mA
OUT
OUT
= V
DD
10 mA
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POWER REQUIRE E TS
The denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
DD
I
DD
P
D
Supply Voltage (Note 9) 4.75 5.25 V Supply Current 39 65 mA
Nap Mode NAP = 0V (Note 11) 2 mA Sleep Mode SLP = 0V 1 µA
Power Dissipation 195 325 mW
Nap Mode NAP = 0V 10 mW Sleep Mode SLP = 0V 5 µW
1411f
3
LTC1411
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TI I G CHARACTERISTICS
range, otherwise specifications are TA = 25°C. (Notes 5) (See Figures 11a, 11b)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
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
.
DD
Note 5: V tr = tf = 5ns unless otherwise specified.
Note 6: Linearity, offset and full-scale specifications apply for a single­ended A
Maximum Sampling Frequency (Note 9) 2.5 MHz Conversion Time 250 350 ns Acquisition Time 100 ns SLP↑ to CONVST↓ Wake-Up Time 10µF Bypass Capacitor at REFCOM2 Pin 210 ms NAP↑ to CONVST↓ Wake-Up Time 250 ns CONVST Low Time (Note 10) 20 ns CONVST to BUSY Delay CL = 25pF 12 ns Data Ready After BUSY 7ns CONVST High Time (Note 10) 20 ns Aperture Delay of Sample-and-Hold 7 ns
= 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.
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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
100 1000 10000
INPUT FREQUENCY (kHz)
1411 G01
vs Input Frequency
86 80 74 68 62 56 50
SNR (dB)
44 38 32 26 20 14
10
100 1000 10000
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
100 1000 10000
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
4.75 5.0 5.25 5.5
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
100 1000 10000
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
100 1000 10000
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
25 50
0
TEMPERATURE (°C)
1411 G05
75 100
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
250 500 750 1250
0
INPUT FREQUENCY (kHz)
SINAD = 78.8dB SFDR = 95dB f
= 2.5MHz
SAMPLE
= 100kHz
f
IN
1000
1411 G14
1411f
5
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