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LTC1408CUH-12#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LTC1408-12
140812f
6 Channel, 12-Bit, 600ksps
Simultaneous Sampling ADC
with Shutdown
The LTC
®
1408-12 is a 12-bit, 600ksps ADC with six
simultaneously sampled differential inputs. The device
draws only 5mA from a single 3V supply, and comes in a
tiny 32 pin (5mm × 5mm) QFN package. A SLEEP shut-
down feature further reduces power consumption to
6µW. The combination of low power and tiny package
makes the LTC1408-12 suitable for portable applications.
The LTC1408-12 contains six separate differential inputs
that are sampled simultaneously on the rising edge of the
CONV signal. These six sampled inputs are then
converted at a rate of 100ksps per channel.
The 83dB common mode rejection allows users to
eliminate ground loops and common mode noise by
measuring signals differentially from the source.
The device converts 0V to 2.5V unipolar inputs differen-
tially, or ±1.25V bipolar inputs also differentially,
depending on the state of the BIP pin. Any analog input
may swing rail-to-rail as long as the differential input
range is maintained.
The conversion sequence can be abbreviated to convert
fewer than six channels, depending on the logic state of
the SEL2, SEL1 and SEL0 inputs.
The serial interface sends out the six conversion results in
96 clocks for compatibility with standard serial interfaces.
■
600ksps ADC with 6 Simultaneously Sampled
Differential Inputs
■
100ksps Throughput per Channel
■
72dB SINAD
■
Low Power Dissipation: 15mW
■
3V Single Supply Operation
■
2.5V Internal Bandgap Reference, Can be Overdriven
with External Reference
■
3-Wire SPI-Compatible Serial Interface
■
0V to 2.5V Unipolar, or ±1.25V Bipolar Differential
Input Range
■
SLEEP (6µW) Shutdown Mode
■
NAP (3.3mW) Shutdown Mode
■
Internal Conversion Triggered by CONV
■
83dB Common Mode Rejection
■
Tiny 32-Pin (5mm
××
××
×
5mm) QFN Package
■
Multiphase Power Measurement
■
Multiphase Motor Control
■
Data Acquisition Systems
■
Uninterruptable Power Supplies
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
BLOCK DIAGRA
W
–
+
4
5
25
24
–
+
7 6912
13
1619 8
CH0
–
CH0
+
CH1
–
CH1
+
10
11
–
+
1415
CH2
–
CH2
+
CH3
–
CH3
+
–
+
17
18
–
+
2021
S AND H S AND H S AND H S AND H S AND H
CH4
–
CH4
+
CH5
–
CH5
+
MUX
V
REF
10µF
BIP SEL2 SEL1 SEL0
GND
2.5V
REFERENCE
600ksps
12-BIT ADC
12-BIT LATCH 5
12-BIT LATCH 4
12-BIT LATCH 3
12-BIT LATCH 2
12-BIT LATCH 1
12-BIT LATCH 0
10µF3V
V
CC
V
DD
2629232233 27 28
2
1
SD0
0.1µF
3
OV
DD
3V
32
SCK
31
DGND
OGND
30
CONV
THREE-
STATE
SERIAL
OUTPUT
PORT
TIMING
LOGIC
235114 TA01
–
+
S AND H
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6084440, 6522187.
2
LTC1408-12
140812f
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
(Notes 1, 2)
Supply Voltage (V
DD
, V
CC
, OV
DD
) .............................. 4V
Analog and V
REF
Input Voltages
(Note 3) ................................... – 0.3V to (V
DD
+ 0.3V)
Digital Input Voltages .................. – 0.3V to (V
DD
+ 0.3V)
Digital Output Voltage .................. – 0.3V to (V
DD
+ 0.3V)
Power Dissipation.............................................. 100mW
Operation Temperature Range
LTC1408C-12 .......................................... 0°C to 70°C
LTC1408I-12 ...................................... –40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution (No Missing Codes) ● 12 Bits
Integral Linearity Error (Note 5) ● –1 ±0.25 1 LSB
Offset Error (Note 4) ● –4.5 ±1 4.5 mV
Offset Match from CH0 to CH5 –3 ±0.5 3 mV
Range Error (Note 4) ● –12 ±212 mV
Range Match from CH0 to CH5 –5 ±15 mV
Range Tempco Internal Reference (Note 4) ±15 ppm/°C
External Reference ±1 ppm/°C
The ● denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. With internal reference, V
DD
= V
CC
= 3V.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Analog Differential Input Range (Notes 3, 8, 9) 2.7V ≤ V
DD
≤ 3.3V 0 to 2.5 V
V
CM
Analog Common Mode + Differential 0 to V
DD
V
Input Range (Note 8)
I
IN
Analog Input Leakage Current ● 1 µA
C
IN
Analog Input Capacitance 13 pF
t
ACQ
Sample-and-Hold Acquisition Time (Note 6) ● 39 ns
t
AP
Sample-and-Hold Aperture Delay Time 1 ns
t
JITTER
Sample-and-Hold Aperture Delay Time Jitter 0.3 ps
t
SK
Channel to Channel Aperture Skew 200 ps
CMRR Analog Input Common Mode Rejection Ratio f
IN
= 100kHz, V
IN
= 0V to 3V –83 dB
f
IN
= 10MHz, V
IN
= 0V to 3V –67 dB
CO VERTER CHARACTERISTICS
U
A ALOG I PUT
UU
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART
NUMBER
QFN PART MARKING
T
JMAX
= 125°C, θ
JA
= 34°C/ W
EXPOSED PIN IS GND (PAD 33)
MUST BE SOLDERED TO PCB
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
QFN PACKAGE
32-PIN (5mm × 5mm) PLASTIC QFN
16
15
14
13
12
11
10
9
25
26
27
28
29
30
31
32
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
V
CC
V
REF
GND
CH5–
CH5+
GND
CH4–
CH4+
SDO
OGND
OV
DD
CH0
+
CH0
–
GND
CH1
+
CH1
–
GND
CH2+
CH2–
GND
GND
CH3+
CH3–
GND
SCK
DGND
CONV
BIP
SEL0
SEL1
SEL2
V
DD
33
LTC1408CUH-12
LTC1408IUH-12
1408-12
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. With internal reference, V
DD
= V
CC
= 3V.
3
LTC1408-12
140812f
The ● denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. With internal reference, V
DD
= V
CC
= 3V.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SINAD Signal-to-Noise Plus 100kHz Input Signal ● 70 72 dB
Distortion Ratio 300kHz Input Signal 72 dB
THD Total Harmonic 100kHz First 5 Harmonics ● –80 –90 dB
Distortion 300kHz First 5 Harmonics –86 dB
SFDR Spurious Free 100kHz Input Signal 90 dB
Dynamic Range 300kHz Input Signal 86 dB
IMD Intermodulation 0.625V
P-P
, 833kHz into CH0+, 0.625V
P-P
, 841kHz into CH0–. –80 dB
Distortion Bipolar Mode. Also Applicable to Other Channels
Code-to-Code V
REF
= 2.5V (Note 17) 0.2 LSB
RMS
Transition Noise
Full Power Bandwidth V
IN
= 2.5V
P-P
, SDO = 11585LSB
P-P
(–3dBFS) (Note 15) 50 MHz
Full Linear Bandwidth S/(N + D) ≥ 68dB, Bipolar Differential Input 5 MHz
The ● denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. V
DD
= V
CC
= 3V.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
High Level Input Voltage V
DD
= 3.3V ● 2.4 V
V
IL
Low Level Input Voltage V
DD
= 2.7V ● 0.6 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
= 3V, I
OUT
= –200µA ● 2.5 2.9 V
V
OL
Low Level Output Voltage V
DD
= 2.7V, I
OUT
= 160µA 0.05 V
V
DD
= 2.7V, I
OUT
= 1.6mA ● 0.4 V
I
OZ
Hi-Z Output Leakage D
OUT
V
OUT
= 0V and V
DD
● ±10 µA
C
OZ
Hi-Z Output Capacitance D
OUT
1pF
I
SOURCE
Output Short-Circuit Source Current V
OUT
= 0V, V
DD
= 3V 20 mA
I
SINK
Output Short-Circuit Sink Current V
OUT
= V
DD
= 3V 15 mA
DY A IC ACCURACY
U
W
DIGITAL I PUTS A D DIGITAL OUTPUTS
UU
I TER AL REFERE CE CHARACTERISTICS
UU U
T
A
= 25°C. V
DD
= V
CC
= 3V.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
REF
Output Voltage I
OUT
= 0 2.5 V
V
REF
Output Tempco 15 ppm/°C
V
REF
Line Regulation V
DD
= 2.7V to 3.6V, V
REF
= 2.5V 600 µV/V
V
REF
Output Resistance Load Current = 0.5mA 0.2 Ω
V
REF
Settling Time C
REF
= 10µF2ms
External V
REF
Input Range 2.55 V
DD
V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC1408CUH-12#TRPBF

Mfr. #:
Buy LTC1408CUH-12#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 6 Ch, 12-B, 600ksps Simultaneous Smpl AD
Lifecycle:
New from this manufacturer.
Delivery:
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