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LTC1857IG#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
LTC1857/LTC1858/LTC1859
1
185789fb
For more information www.linear.com/LTC1857
100kHz, 12-Bit/14-Bit/16-Bit Sampling ADC
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
8-Channel, 12-/14-/16-Bit,
100ksps SoftSpan A/D
Converters with Shutdown
The LT C
®
1857/LTC1858/LTC1859 are 8-channel, low
power, 12-/14-/16-bit, 100ksps, analog-to-digital convert
-
ers (ADCs). These SoftSpan™ ADCs can be software-
programmed for 0V to 5V, 0V to 10V, ±5V or ±10V input
spans and operate from a single 5V supply. The 8-channel
multiplexer can be programmed for single-ended inputs
or pairs of differential inputs or combinations of both. In
addition, all channels are fault protected to ±25V. A fault
condition on any channel will not affect the conversion
result of the selected channel.
An onboard high performance sample-and-hold and pre
-
cision reference minimize external components. The low
40mW power dissipation is made even more attractive with
two user selectable power shutdown modes. DC specifica
-
tions include ±3LSB INL for the LTC1859, ±1.5LSB INL
for the LTC1858 and ±1LSB for the LTC1857.
The internal clock is trimmed for 5µs maximum conversion
time and the sampling rate is guaranteed at 100ksps. A
separate convert start input and data ready signal (BUSY)
ease connections to FIFOs, DSPs and microprocessors.
n
Sample Rate: 100ksps
n
8-Channel Multiplexer with ±25V Protection
n
Single 5V Supply
n
Software-Programmable Input Ranges:
n
0V to 5V, 0V to 10V, ±5V or ±10V
n
Single-Ended or Differential
n
±3LSB INL for the LTC1859, ±1.5LSB INL for the
LTC1858, ±1LSB INL for the LTC1857
n
Power Dissipation: 40mW (Typ)
n
SPI/MICROWIRE™ Compatible Serial I/O
n
Power Shutdown: Nap and Sleep
n Signal-to-Noise Ratio: 87dB (Typ) for the LTC1859
n Operates with Internal or External Reference
n Internal Synchronized Clock
n 28-Pin SSOP Package
n
Industrial Process Control
n
Multiplexed Data Acquisition Systems
n
High Speed Data Acquisition for PCs
n
Digital Signal Processing
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. SoftSpan is
a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
LTC1859 Typical INL Curve
COM
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
MUXOUT
+
MUXOUT
–
ADC
+
ADC
–
AGND1
CONVST
RD
SCK
SDI
DGND
SDO
BUSY
OV
DD
DV
DD
AV
DD
AGND3
AGND2
REFCOMP
V
REF
LTC1857/
LTC1858/
LTC1859
SOFTWARE-PROGRAMMABLE
SINGLE-ENDED OR
DIFFERENTIAL INPUTS
(0V TO 5V, 0V TO 10V,
±5V OR ±10V)
10µF
10µF1µF
10µF
3V TO 5V
5V
5V
2.5V
10µF
µP
CONTROL
LINES
CODE
–32768
INL (LSB)
0
0.5
1.0
0
1859 TA02
–0.5
–1.0
–2.0
–16384 16384 32767
–1.5
2.0
1.5
LTC1857/LTC1858/LTC1859
2
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For more information www.linear.com/LTC1857
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
Supply Voltage (OV
DD
= DV
DD
= AV
DD
= V
DD
) ............. 6V
Ground Voltage Difference
DGND, AGND1, AGND2, AGND3 ........................±0.3V
Analog Input Voltage
ADC
+
, ADC
–
(Note 3) ................. (AGND1 – 0.3V) to (AV
DD
+ 0.3V)
CH0-CH7, COM ..................................................±25V
Digital Input Voltage (Note 4) .......(DGND – 0.3V) to 10V
Digital Output Voltage ..(DGND – 0.3V) to (DV
DD
+ 0.3V)
Power Dissipation ...............................................500mW
Operating Temperature Range
LTC1857C/LTC1858C/LTC1859C .............. 0°C to 70°C
LTC1857I/LTC1858I/LTC1859I .............. –40°C to 85°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(Note 1)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
G PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
COM
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
MUXOUT
+
MUXOUT
–
ADC
+
ADC
–
AGND1
CONVST
RD
SCK
SDI
DGND
SDO
BUSY
OV
DD
DV
DD
AV
DD
AGND3
AGND2
REFCOMP
V
REF
T
JMAX
= 110°C, θ
JA
= 95°C/W
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC1857CG#PBF LTC1857CG#TRPBF LTC1857CG 28-Lead Plastic SSOP 0°C to 70°C
LTC1857IG#PBF LTC1857IG#TRPBF LTC1857IG 28-Lead Plastic SSOP –40°C to 85°C
LTC1858CG#PBF LTC1858CG#TRPBF LTC1858CG 28-Lead Plastic SSOP 0°C to 70°C
LTC1858IG#PBF LTC1858IG#TRPBF LTC1858IG 28-Lead Plastic SSOP –40°C to 85°C
LTC1859CG#PBF LTC1859CG#TRPBF LTC1859CG 28-Lead Plastic SSOP 0°C to 70°C
LTC1859IG#PBF LTC1859IG#TRPBF LTC1859IG 28-Lead Plastic SSOP –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
LTC1857/LTC1858/LTC1859
3
185789fb
For more information www.linear.com/LTC1857
The l denotes the specifications which
apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C. MUXOUT connected to ADC inputs. (Notes 5, 6)
CONVERTER AND MULTPLEXER CHARACTERISTICS
PARAMETER CONDITIONS
LTC1857 LTC1858 LTC1859
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
Resolution
l
12 14 16 Bits
No Missing Codes
l
12 14 15 Bits
Transition Noise 0.06 0.26 1 LSB
RMS
Integral Linearity Error (Notes 7, 15)
l
±1 ±1.5 ±3 LSB
Differential Linearity Error (Note 15)
l
–1 1 –1 1.5 –2 4 LSB
Bipolar Zero Error (Note 8)
l
±9 ±17 ±28 LSB
Bipolar Zero Error Drift ±0.1 ±0.1 ±0.1 ppm/°C
Bipolar Zero Error Match ±4 ±6 ±10 LSB
Unipolar Zero Error (Note 8)
l
±6 ±15 ±25 LSB
Unipolar Zero Error Drift ±1 ±1 ±1 ppm/°C
Unipolar Zero Error Match ±1.2 ±2 ±8 LSB
Bipolar Full-Scale Error External Reference (Note 11)
Internal Reference (Note 11)
l
±0.35
±0.45
±0.15
±0.4
±0.1
±0.4
%
%
Bipolar Full-Scale Error Drift External Reference
Internal Reference
±2.5
±7
±2.5
±7
±2.5
±7
ppm/°C
ppm/°C
Bipolar Full-Scale Error Match ±5 ±10 ±15 LSB
Unipolar Full-Scale Error External Reference (Note 11)
Internal Reference (Note 11)
l
±0.45
±0.75
±0.25
±0.85
±0.2
±0.75
%
%
Unipolar Full-Scale Error Drift External Reference
Internal Reference
±2.5
±7
±2.5
±7
±2.5
±7
ppm/°C
ppm/°C
Unipolar Full-Scale Error Match ±5 ±12 ±15 LSB
Input Common Mode Range Unipolar Mode
Bipolar Mode
l
l
0 to 10
±10
0 to 10
±10
0 to 10
±10
V
V
Input Common Mode Rejection Ratio 96 96 96 dB
The l denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 5)
ANALOG INPUT
PARAMETER CONDITIONS MIN TYP MAX UNITS
Analog Input Range CH0 to CH7, COM 0 to 5, 0 to 10
±5, ±10
V
V
ADC
+
, ADC
–
(Note 3) 0 to 2.048
0 to 4.096
ADC
–
±1.024
ADC
–
±2.048
V
V
V
V
Impedance CH0 to CH7, COM
Unipolar
Bipolar
42
31
kΩ
kΩ
MUXOUT
+
, MUXOUT
–
Unipolar
Bipolar
10
5
kΩ
kΩ
ADC
+
, ADC
–
Hi-Z kΩ
Capacitance CH0 to CH7, COM 5 pF
Sample Mode ADC
+
, ADC
–
0V to 2.048V, ±1.024V
0V to 4.096V, ±2.048V
24
12
pF
pF
Hold Mode ADC
+
, ADC
–
4 pF
Input Leakage Current ADC
+
, ADC
–
, CONVST = Low
l
±1 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

LTC1857IG#TRPBF

Mfr. #:
Buy LTC1857IG#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 8-Ch, 12-B, 100ksps SoftSpan A/D Convs w
Lifecycle:
New from this manufacturer.
Delivery:
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