12-/16-bit A/D converters with serial I/O, and an internal
reference. The ADCs typically draw only 1.3mA from a
single 5V supply.
The 8-channel input multiplexer can be configured for
either single-ended or differential inputs and unipolar
or bipolar conversions (or combinations thereof). The
automatic nap and sleep modes benefit power sensitive
applications.
The LTC1867’s DC performance is outstanding with a
±2LSB INL specification and no missing codes over tem-
perature. The signal-to-noise ratio (SNR) for the LTC1867
is typically 89dB, with the internal reference.
Housed in a compact, narrow 16-pin SSOP package, the
LTC1863/LTC1867 can be used in space-sensitive as well
as low-power applications.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
n
n
n
n
n
n
n
n
Sample Rate: 200ksps
16-Bit No Missing Codes and ±2LSB Max INL
8-Channel Multiplexer with:
Single Ended or Differential Inputs and
Unipolar or Bipolar Conversion Modes
SPI/MICROWIRE™ Serial I/O
Signal-to-Noise Ratio: 89dB
Single 5V Operation
On-Chip or External Reference
Low Power: 1.3mA at 200ksps, 0.76mA at 100ksps
Sleep Mode
Automatic Nap Mode Between Conversions
16-Pin Narrow SSOP Package
APPLICATIONS
n
n
n
n
n
Industrial Process Control
High Speed Data Acquisition
Battery Operated Systems
Multiplexed Data Acquisition Systems
Imaging Systems
BLOCK DIAGRAM
Integral Nonlinearity vs Output Code
(LTC1867)
2.0
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7/COM
1
2
3
4
5
6
7
8
LTC1863/LTC1867 16 V
15
DD
GND
14
SDI
13
+
12-/16-BIT
SDO
SERIAL
200ksps
12
PORT
–
SCK
ADC
11
CS/CONV
10
V
REF
INTERNAL
2.5V REF
9
18637 BD
1.5
1.0
INL (LSB)
ANALOG
INPUT
MUX
0.5
0
–0.5
–1.0
REFCOMP
–1.5
–2.0
0
16384
32768
49152
OUTPUT CODE
65536
18637 GO1
18637fa
1
LTC1863/LTC1867
ABSOLUTE MAXIMUM RATINGS
(Note 1, 2)
PIN CONFIGURATION
TOP VIEW
CH0 1
CH1 2
CH2 3
CH3 4
CH4 5
CH5 6
CH6 7
CH7/COM 8
16 V
DD
15 GND
14 SDI
13 SDO
12 SCK
11
CS/CONV
10 V
REF
9
REFCOMP
Supply Voltage (V
DD
) ................................... –0.3V to 6V
Analog Input Voltage
CH0-CH7/COM (Note 3) ...........– 0.3V to (V
DD
+ 0.3V)
V
REF
, REFCOMP (Note 4) ......... –0.3V to (V
DD
+ 0.3V)
Digital Input Voltage (SDI, SCK,
CS/CONV)
(Note 4) ................................................. –0.3V to 10V
Digital Output Voltage (SDO) ....... –0.3V to (V
DD
+ 0.3V)
Power Dissipation .............................................. 500mW
Operating Temperature Range
LTC1863C/LTC1867C/LTC1867AC ............ 0°C to 70°C
LTC1863I/LTC1867I/LTC1867AI ...........–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
T
JMAX
= 110°C,
θ
JA
= 95°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC1863CGN#PBF
LTC1863IGN#PBF
LTC1867CGN#PBF
LTC1867IGN#PBF
LTC1867ACGN#PBF
LTC1867AIGN #PBF
TAPE AND REEL
LTC1863CGN#TRPBF
LTC1863IGN#TRPBF
LTC1867CGN#TRPBF
LTC1867IN#TRPBF
LTC1867ACGN#TRPBF
LTC1867AIGN#TRPBF
PART MARKING*
1863
1863
1867
1867
1867
1867
PACKAGE DESCRIPTION
16-Lead Narrow Plastic SSOP
16-Lead Narrow Plastic SSOP
16-Lead Narrow Plastic SSOP
16-Lead Narrow Plastic SSOP
16-Lead Narrow Plastic SSOP
16-Lead Narrow Plastic SSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
CONVERTER CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. With external reference (Notes 5, 6)
LTC1863
PARAMETER
Resolution
No Missing Codes
Integral Linearity Error
Differential Linearity Error
Transition Noise
Offset Error
Offset Error Match
Offset Error Drift
Gain Error
Unipolar
Bipolar
Unipolar (Note 8)
Bipolar
Unipolar
Bipolar
±0.5
±6
±6
l
l
LTC1867
MAX
MIN
16
15
±1
±1
±1
–2
0.74
±3
±4
±1
±1
±0.5
±96
±96
±32
±64
±2
±2
±4
±4
3
–1
TYP
MAX
MIN
16
16
LTC1867A
TYP
MAX
UNITS
Bits
Bits
±2
±2.5
1.75
0.74
±32
±64
±2
±2
±0.5
±64
±64
LSB
LSB
LSB
LSB
RMS
LSB
LSB
LSB
LSB
ppm/°C
LSB
LSB
18637fa
CONDITIONS
l
l
l
l
l
MIN
12
12
TYP
Unipolar (Note 7)
Bipolar
0.1
2
LTC1863/LTC1867
CONVERTER CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. With external reference (Notes 5, 6)
LTC1863
PARAMETER
Gain Error Match
Gain Error Tempco
Power Supply Sensitivity
Internal Reference
External Reference
V
DD
= 4.75V – 5.25V
±15
±2.7
±1
CONDITIONS
MIN
TYP
MAX
±1
±15
±2.7
±5
MIN
LTC1867
TYP
MAX
±4
±15
±2.7
±5
MIN
LTC1867A
TYP
MAX
±2
UNITS
LSB
ppm/°C
ppm/°C
LSB
DYNAMIC ACCURACY
SYMBOL PARAMETER
SNR
S/(N+D)
THD
Signal-to-Noise Ratio
Total Harmonic Distortion
Peak Harmonic or Spurious Noise
Channel-to-Channel Isolation
Full Power Bandwidth
(Note 5)
LTC1863
CONDITIONS
1kHz Input Signal
1kHz Input Signal, Up to 5th Harmonic
1kHz Input Signal
100kHz Input Signal
–3dB Point
MIN
TYP
73.6
73.5
–94.5
–94.5
–100
1.25
MAX
LTC1867/LTC1867A
MIN
TYP
89
88
–95
–95
–117
1.25
MAX
UNITS
dB
dB
dB
dB
dB
MHz
Signal-to-(Noise + Distortion) Ratio 1kHz Input Signal
ANALOG INPUT
SYMBOL
PARAMETER
The
l
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 5)
LTC1863/LTC1867/LTC1867A
CONDITIONS
Unipolar Mode (Note 9)
Bipolar Mode
Between Conversions (Sample Mode)
During Conversions (Hold Mode)
l
l
l
MIN
TYP
0-4.096
±2.048
32
4
MAX
UNITS
V
V
pF
pF
μs
Analog Input Range
C
IN
t
ACQ
Analog Input Capacitance for CH0 to
CH7/COM
Sample-and-Hold Acquisition Time
Input Leakage Current
1.5
1.1
±1
On Channels, CHX = 0V or V
DD
l
μA
INTERNAL REFERENCE CHARACTERISTICS
PARAMETER
V
REF
Output Voltage
V
REF
Output Tempco
V
REF
Line Regulation
V
REF
Output Resistance
REFCOMP Output Voltage
CONDITIONS
I
OUT
= 0
I
OUT
= 0
4.75V ≤ V
DD
≤ 5.25V
⏐I
OUT
⏐
≤0.1mA
I
OUT
= 0
(Note 5)
LTC1863/LTC1867/LTC1867A
MIN
2.48
TYP
2.5
±15
0.43
6
4.096
MAX
2.52
UNITS
V
ppm/°C
mV/V
kΩ
V
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
LTC1863/LTC1867/LTC1867A
SYMBOL
V
IH
V
IL
I
IN
PARAMETER
High Level Input Voltage
Low Level Input Voltage
Digital Input Current
CONDITIONS
V
DD
= 5.25V
V
DD
= 4.75V
V
IN
= 0V to V
DD
l
l
l
DIGITAL INPUTS AND DIGITAL OUTPUTS
MIN
2.4
TYP
MAX
0.8
±10
UNITS
V
V
μA
18637fa
3
LTC1863/LTC1867
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
LTC1863/LTC1867/LTC1867A
SYMBOL
C
IN
V
OH
V
OL
I
SOURCE
I
SINK
PARAMETER
Digital Input Capacitance
High Level Output Voltage (SDO)
Low Level Output Voltage (SDO)
Output Source Current
Output Sink Current
Hi-Z Output Leakage
Hi-Z Output Capacitance
Data Format
V
DD
= 4.75V, I
O
= –10μA
V
DD
= 4.75V, I
O
= –200μA
V
DD
= 4.75V, I
O
= 160μA
V
DD
= 4.75V, I
O
= 1.6mA
SDO = 0V
SDO = V
DD
CS/CONV
= High, SDO = 0V or V
DD
CS/CONV
= High (Note 10)
Unipolar
Bipolar
l
l
l
l
DIGITAL INPUTS AND DIGITAL OUTPUTS
CONDITIONS
MIN
TYP
2
4.75
4.74
0.05
0.1
–32
19
MAX
UNITS
pF
V
V
4
0.4
V
V
mA
mA
±10
15
Straight Binary
Two’s Complement
μA
pF
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
LTC1863/LTC1867/LTC1867A
SYMBOL
V
DD
I
DD
PARAMETER
Supply Voltage
Supply Current
CONDITIONS
(Note 9)
f
SAMPLE
= 200ksps
NAP Mode
SLEEP Mode
l
l
l
POWER REQUIREMENTS
MIN
4.75
TYP
1.3
150
0.2
6.5
MAX
5.25
1.8
3
9
UNITS
V
mA
μA
μA
mW
P
DISS
Power Dissipation
TIMING CHARACTERISTICS
SYMBOL
f
SAMPLE
t
CONV
t
ACQ
f
SCK
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
PARAMETER
Maximum Sampling Frequency
Conversion Time
Acquisition Time
SCK Frequency
CS/CONV
High Time
SDO Valid After SCK↓
SDO Valid Hold Time After SCK↓
SDO Valid After
CS/CONV↓
SDI Setup Time Before SCK↑
SDI Hold Time After SCK↑
SLEEP Mode Wake-Up Time
Bus Relinquish Time After
CS/CONV↑
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
LTC1863/LTC1867/LTC1867A
CONDITIONS
l
l
l
MIN
200
TYP
3
MAX
3.5
40
UNITS
kHz
μs
μs
MHz
ns
ns
ns
ns
ns
ns
ms
1.5
40
5
15
10
1.1
100
13
11
10
–6
4
60
20
40
30
22
Short
CS/CONV
Pulse Mode
C
L
= 25pF (Note 11)
C
L
= 25pF
C
L
= 25pF
l
l
l
l
l
l
C
REFCOMP
= 10μF, C
VREF
= 2.2μF
C
L
= 25pF
l
ns
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime
Note 2:
All voltage values are with respect to GND (unless otherwise noted).
Note 3:
When these pin voltages are taken below GND or above V
DD
, they
will be clamped by internal diodes. This product can handle input currents
of greater than 100mA without latchup.
18637fa
4
LTC1863/LTC1867
TIMING CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
Note 4:
When these pin voltages are taken below GND, they will be
clamped by internal diodes. This product can handle input currents of
greater than 100mA below GND without latchup. These pins are not
clamped to V
DD
.
Note 5:
V
DD
= 5V, f
SAMPLE
= 200ksps at 25°C, t
r
= t
f
= 5ns and
V
IN
– = 2.5V for bipolar mode unless otherwise specified.
Note 6:
Linearity, offset and gain error specifications apply for both
unipolar and bipolar modes. The INL and DNL are tested in bipolar mode.
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:
Unipolar offset is the offset voltage measured from +1/2LSB
when the output code flickers between 0000 0000 0000 0000 and
0000 0000 0000 0001 for LTC1867 and between 0000 0000 0000 and
0000 0000 0001 for LTC1863. Bipolar offset is the offset voltage measured
from –1/2LSB when output code flickers between 0000 0000 0000 0000
and 1111 1111 1111 1111 for LTC1867, and between
0000 0000 0000 and 1111 1111 1111 for LTC1863.
Note 9:
Recommended operating conditions. The input range of ±2.048V
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