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LTC2752ACLX#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LTC2752
22
2752f
in 5V or 10V full-scale systems. However, as the circuit
bandwidths increase, filtering the output of the reference
may be required to minimize output noise.
Grounding
As with any high resolution converter, clean grounding
is important. A low impedance analog ground plane is
necessary, as are star grounding techniques. Keep the
board layer used for star ground continuous to minimize
ground resistances; that is, use the star-ground concept
without using separate star traces. The I
OUT2
pins are
of particular concern; INL will be degraded by the code
dependent currents carried by the I
OUT2XF
and I
OUT2XS
pins if voltage drops to ground are allowed to develop.
applicaTions inForMaTion
The best strategy here is to tie the pins to the star ground
plane by multiple vias located directly underneath the part.
Alternatively, the pins may be routed to the star ground
point if necessary; join the force and sense pins together
at the part and route one trace for each channel of no more
than 120 squares of 1oz. copper.
In the rare case in which neither of these alternatives is
practicable, a force/sense amplifier should be used as a
ground buffer (see Typical Applications). Note, however,
that the voltage offset of the ground buffer amp directly
contributes to the effects on accuracy specified in Table
5 under V
OS1
. The combined effects of the offsets can be
calculated by substituting the total offset from I
OUT1X
to
I
OUT2XS
for V
OS1
in the equations.
Figure 5. Optional Circuits for Driving I
OUT2
from GND with a Force/Sense Amplifier
–
+
–
+
1/2 LT1469
1/2 LT1469
DAC A
LTC2752
V
REF
5V
2
1
3
44
45, 46
47, 48
5, 6
4
3
1
1, 2
I
OUT1A
15pF
I
OUT2A
R
FBA
V
OSADJA
REFA
R
COMA
R
INA
R
OFSA
V
OUTA
8, 9
43
2752 F05
150pF
3
2
DAC B
–
+
GE
ADJA
–
+
69
8
1
2 3
I
OUT2AF
I
OUT2AS
2
3
*SCHOTTKY BARRIER DIODE
ZETEX*
BAT54S
LT1012
1000pF
ALTERNATE AMPLIFIER FOR OPTIMUM SETTLING TIME PERFORMANCE
69
1
2 3
8
–
+
LT1468
3
ZETEX
BAT54S
2
200Ω
200Ω
I
OUT2AS
I
OUT2AF
LTC2752
23
2752f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
package DescripTion
LX48 LQFP 0907 REVØ
0° – 7°
11° – 13°
0.45 – 0.75
1.00 REF
11° – 13°
9.00 BSC
A A
7.00 BSC
1
2
7.00 BSC
9.00 BSC
48
1.60
MAX
1.35 – 1.45
0.05 – 0.150.09 – 0.20
0.50
BSC
0.17 – 0.27
GAUGE PLANE
0.25
NOTE:
1. PACKAGE DIMENSIONS CONFORM TO JEDEC #MS-026 PACKAGE OUTLINE
2. DIMENSIONS ARE IN MILLIMETERS
3. DIMENSIONS OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.25mm ON ANY SIDE, IF PRESENT
4. PIN-1 INDENTIFIER IS A MOLDED INDENTATION, 0.50mm DIAMETER
5. DRAWING IS NOT TO SCALE
SEE NOTE: 4
C0.30 – 0.50
R0.08 – 0.20
7.15 – 7.25
5.50 REF
1
2
5.50 REF
7.15 – 7.25
48
PACKAGE OUTLINE
RECOMMENDED SOLDER PAD LAYOUT
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
SECTION A – A
0.50 BSC
0.20 – 0.30
1.30 MIN
LX Package
48-Lead Plastic LQFP (7mm × 7mm)
(Reference LTC DWG # 05-08-1760 Rev Ø)
LTC2752
24
2752f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2010
LT 0510 • PRINTED IN USA
relaTeD parTs
Typical applicaTion
R
OFSA
47, 48 5, 6
45, 46
39, 40
R
INA
REFA
1, 2
R
COMA
3
R
OFSB
R
COMB
REFB
37, 38
11 12 13 14 31, 32 34 35, 36
C5
100pF
2752 TA02
V
OUT
DACB
LT1012A
LT1012A
15V
–15V
–
+
7
6
3
2
4
2
3
4
7
6
I
OUT2B
GND
28, 29
7, 10, 15, 17, 18, 27, 30
C4
27pF
15V
–15V
I
OUT1B
R
FBB
41
+
–
V
OSADJA
GE
ADJA
–15V
15V
–
+
7
6
3
2
4
LTC2752
R
INB
26
V
DD
V
OSADJB
GE
ADJB
5V REFERENCE
16
4
43
33
42
M-SPAN
22
S0
23
S1
24
S2
25
SDI
CS/LD
SCK SRO
SDI
CS1
SCK SRO
LDAC
19
CLR
LT1236-5
IN
OUT
4
62
15V
CS2
SDISPI BUS
SCK
4
6
5
C2
0.1µF
C7
10µF
C6
10µF
10k 10k
REF
V
OUTA
V
OUTB
V
OUTC
V
OUTD
2
3
8
9
V
CC
10, 11
GND
LTC2634-MSELMX12
71
C1
100pF
V
OUT
DACA
2
3
4
7
6
I
OUT2A
8, 9
C3
27pF
15V
–15V
I
OUT1A
R
FBA
44
+
–
LT1468
LT1468
CS/LD
SDI
SCK
SPI BUS
10
7
4
1
6
+
–
LT1991
450k
450k
450k
10
1
6
LT1991
10
1
6
LT1991
10
1
6
LT1991
15V
–15V
Digitally Controlled Offset and Gain Trim Circuit. Powering V
DD
from LT1236 Ensures Quiet Supply
PART NUMBER DESCRIPTION COMMENTS
LTC2757 Single Parallel 18-Bit I
OUT
SoftSpan DAC
±1LSB INL/DNL, Software-Selectable Ranges, 7mm × 7mm LQFP-48 Package
LTC2754 Quad Serial 16-Bit/12-Bit I
OUT
SoftSpan DACs
±1LSB INL/DNL, Software-Selectable Ranges, 7mm × 8mm QFN-52 Package
LTC2751 Single Parallel 16-Bit/14-Bit/12-Bit I
OUT
SoftSpan DAC
±1LSB INL/DNL, Software-Selectable Ranges, 5mm × 7mm QFN-38 Package
LTC2753 Dual Parallel 16-Bit/14-Bit/12-Bit I
OUT
SoftSpan DACs
±1LSB INL/DNL, Software-Selectable Ranges, 7mm × 7mm QFN-48 Package
LTC2755 Quad Parallel 16-Bit/14-Bit/12-Bit I
OUT
SoftSpan DACs
±1LSB INL/DNL, Software-Selectable Ranges, 9mm × 9mm QFN-64 Package
LTC1590 Dual Serial 12-Bit Multiplying I
OUT
DAC ± 0.5LSB INL/DNL 2-Quadrant, 16-Pin Narrow SO and PDIP Packages
LTC1592 Single Serial 16-Bit/14-Bit/12-Bit I
OUT
SoftSpan DAC ±1LSB INL/DNL, Software-Selectable Ranges, 16-Lead SSOP Package
LTC1591/LTC1597 Single Parallel 16-Bit/14-Bit I
OUT
DACs ±1LSB INL/DNL, Integrated 4-Quadrant Resistors, 28-Lead SSOP Package
LTC2704 Quad Serial 16-Bit/14-Bit/12-Bit V
OUT
SoftSpan DACs ±1LSB INL/DNL, Software-Selectable Ranges, Integrated Amplifiers
References
LTC6655 Precision Reference 0.025% Maximum Tolerance, 0.25ppm
P-P
0.1Hz to 10Hz Noise
LT1027 Precision Reference 2ppm/°C Maximum Drift
LT1236A-5 Precision Reference 0.05% Maximum Tolerance, 1ppm
P-P
0.1Hz to 10Hz Noise
Amplifiers
LT1012 Precision Operational Amplifier 25µV Max Offset, 100pA Max Bias Current, 0.5µV
P-P
Noise, 380µA Supply
Current
LT1001 Precision Operational Amplifier 25µV Max Offset, 0.3µV
P-P
Noise, High Output Drive
LT1468/LT1469 Single/Dual 16-Bit Accurate Op-Amp 90MHz GBW, 22V/μs Slew Rate, 0.3µV
P-P
Noise
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

LTC2752ACLX#PBF

Mfr. #:
Buy LTC2752ACLX#PBF
Manufacturer:
Analog Devices Inc.
Description:
Digital to Analog Converters - DAC Dual16-Bit Serial SoftSpan IOUT DACs ( 1LSB INL Max)
Lifecycle:
New from this manufacturer.
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