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LTC1861LCMS#PBF

P1-P3P4-P6P7-P9P10-P12
10
LTC1860L/LTC1861L
18601Lf
Figure 4. LTC1861L Operating Sequence
MUX ADDRESS
Table 1. Multiplexer Channel Selection
SGL/DIFF
1
1
0
0
ODD/SIGN
0
1
0
1
CHANNEL #
0
+
+
–
1
+
–
+
GND
–
–
186465 TBL1
SINGLE-ENDED
MUX MODE
DIFFERENTIAL
MUX MODE
DON'T CARE
CONV
SDI
SCK
121110987654321
SDO
B11
B10B8B6B4B2B0*
Hi-Z
B9
B7 B5 B3 B1
S/D O/S
DON’T CAREDON’T CARE
t
CONV
1860 F04
SLEEP MODE
*AFTER COMPLETING THE DATA TRANSFER, IF FURTHER SCK CLOCKS ARE
APPLIED WITH CONV LOW, THE ADC WILL OUTPUT ZEROS INDEFINITELY
Hi-Z
t
SMPL
Figure 5. LTC1861L Transfer Curve
0V
1LSB
V
CC
– 2LSB
V
CC
– 1LSB
V
CC
V
IN
*
*V
IN
= (SELECTED “+” CHANNEL) –
(SELECTED “–” CHANNEL)
REFER TO TABLE 1
0 0 0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 0
•
•
•
1860 F05
APPLICATIO S I FOR ATIO
WUUU
GENERAL ANALOG CONSIDERATIONS
Grounding
The LTC1860L/LTC1861L should be used with an analog
ground plane and single point grounding techniques. Do
not use wire wrapping techniques to breadboard and
evaluate the device. To achieve the optimum performance,
use a printed circuit board. The ground pins (AGND and
DGND for the LTC1861L MSOP package and GND for the
LTC1860L and LTC1861L SO-8 package) should be tied
directly to the analog ground plane with minimum lead
length.
Bypassing
For good performance, the V
CC
and V
REF
pins must be free
of noise and ripple. Any changes in the V
CC
/V
REF
voltage
with respect to ground during the conversion cycle can
induce errors or noise in the output code. Bypass the V
CC
and V
REF
pins directly to the analog ground plane with a
minimum of 1µF tantalum. Keep the bypass capacitor
leads as short as possible.
Analog Inputs
Because of the capacitive redistribution A/D conversion
techniques used, the analog inputs of the LTC1860L/
LTC1861L have capacitive switching input current spikes.
These current spikes settle quickly and do not cause a
problem if source resistances are less than 200Ω or high
speed op amps are used (e.g., the LT
®
1211, LT1469,
LT1807, LT1810, LT1630, LT1226 or LT1215). But if large
source resistances are used, or if slow settling op amps
drive the inputs, take care to ensure the transients caused
by the current spikes settle completely before the conver-
sion begins.
11
LTC1860L/LTC1861L
18601Lf
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
MS Package
10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661)
U
PACKAGE DESCRIPTIO
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
MSOP (MS8) 0802
0.53 ± 0.015
(.021 ± .006)
SEATING
PLANE
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.18
(.077)
0.254
(.010)
1.10
(.043)
MAX
0.22 – 0.38
(.009 – .015)
TYP
0.13 ± 0.076
(.005 ± .003)
0.86
(.034)
REF
0.65
(.0256)
BSC
0
° – 6° TYP
DETAIL “A”
DETAIL “A”
GAUGE PLANE
12
3
4
4.90
± 0.15
(1.93 ± .006)
8
7
6
5
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
3.00 ± 0.102
(.118 ± .004)
NOTE 4
0.52
(.206)
REF
5.23
(.206)
MIN
3.2 – 3.45
(.126 – .136)
0.889
± 0.127
(.035 ± .005)
RECOMMENDED SOLDER PAD LAYOUT
0.42 ± 0.04
(.0165 ± .0015)
TYP
0.65
(.0256)
BSC
MSOP (MS) 0802
0.53 ± 0.01
(.021 ± .006)
SEATING
PLANE
0.18
(.007)
1.10
(.043)
MAX
0.17 – 0.27
(.007 – .011)
TYP
0.13 ± 0.076
(.005 ± .003)
0.86
(.034)
REF
0.50
(.0197)
BSC
12
3
45
4.90 ± 0.15
(1.93 ± .006)
0.497 ± 0.076
(.0196 ± .003)
REF
8910
7
6
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
3.00 ± 0.102
(.118 ± .004)
NOTE 4
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.254
(.010)
0° – 6° TYP
DETAIL “A”
DETAIL “A”
GAUGE PLANE
5.23
(.206)
MIN
3.2 – 3.45
(.126 – .136)
0.889 ± 0.127
(.035 ± .005)
RECOMMENDED SOLDER PAD LAYOUT
0.305 ± 0.038
(.0120 ± .0015)
TYP
0.50
(.0197)
BSC
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)
× 45°
0°– 8° TYP
.008 – .010
(0.203 – 0.254)
SO8 0303
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
1
2
3
4
.150 – .157
(3.810 – 3.988)
NOTE 3
8
7
6
5
.189 – .197
(4.801 – 5.004)
NOTE 3
.228 – .244
(5.791 – 6.197)
.245
MIN
.160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
.050 BSC
.030 ±.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
12
LTC1860L/LTC1861L
18601Lf
LT/TP 0303 2K • PRINTED IN USA
RELATED PARTS
LINEAR TECHNOLOGY CORPORATION 2001
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
U
TYPICAL APPLICATIO
Tiny 2-Chip Data-Acquistion System
–
+
LTC6910-1
0.1µF
1µF
1µF
3V
3V
AGND
3
8
4
1
2
7
6
5
V
IN
GAIN
CONTROL
ADC
CONTROL
499Ω
270pF
V
REF
IN
+
IN
–
GND
V
CC
SCK
SDO
CONV
LTC1860L
LTC6910-1 (IN TSOT-23 PACKAGE) COMPACTLY ADDS 40dB OF INPUT GAIN
RANGE TO THE LTC1860L (IN MSOP 8-PIN PACKAGE). SINGLE 3V SUPPLY
1860L/61L TA03
PART NUMBER SAMPLE RATE POWER DISSIPATION DESCRIPTION
12-Bit Serial I/O ADCs
LTC1286/LTC1298 12.5ksps/11.1ksps 1.3mW/1.7mW 1-Channel with Ref. Input (LTC1286), 2-Channel (LTC1298), 5V
LTC1400 400ksps 75mW 1-Channel, Bipolar or Unipolar Operation, Internal Reference, 5V
LTC1401 200ksps 15mW SO-8 with Internal Reference, 3V
LTC1402 2.2Msps 90mW Serial I/O, Bipolar or Unipolar, Internal Reference
LTC1404 600ksps 25mW SO-8 with Internal Reference, Bipolar or Unipolar, 5V
LTC1860/LTC1861 250ksps 4.25mW SO-8, MS8, 1-Channel, 5V/SO-8, MS, 2-Channel, 5V
14-Bit Serial I/O ADCs
LTC1417 400ksps 20mW 16-Pin SSOP, Unipolar or Bipolar, Reference, 5V
LTC1418 200ksps 15mW Serial/Parallel I/O, Internal Reference, 5V
16-Bit Serial I/O ADCs
LTC1609 200ksps 65mW Configurable Bipolar or Unipolar Input Ranges, 5V
LTC1864/LTC1865 250ksps 4.25mW SO-8, MS8, 1-Channel, 5V/SO-8, MS, 2-Channel, 5V
LTC1864L/LTC1865L 150ksps 1.22mW SO-8, MS8, 1-Channel, 3V/SO-8, MS, 2-Channel, 3V
References
LT1460 Micropower Precision Series Reference Bandgap, 130µA Supply Current, 10ppm/°C, Available in SOT-23
LT1790 Micropower Low Dropout Reference 60µA Supply Current, 10ppm/°C, SOT-23
P1-P3P4-P6P7-P9P10-P12

LTC1861LCMS#PBF

Mfr. #:
Buy LTC1861LCMS#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Analog to Digital Converters - ADC 12-bit, 3V, 2-ch. 150ksps ADC
Lifecycle:
New from this manufacturer.
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