1
LTC1197/LTC1197L
LTC1199/LTC1199L
10-Bit, 500ksps ADCs in
MSOP with Auto Shutdown
Single 2.7V Supply, 250ksps, 10-Bit Sampling ADC
Supply Current vs Sampling Frequency
SAMPLING FREQUENCY (kHz)
0.01
SUPPLY CURRENT (
A)
100
1000
10000
100
1197/99 G03
10
1
0.1
0.1
1
10
1000
V
CC
= 5V
f
CLK
= 7.2MHz
V
CC
= 2.7V
f
CLK
= 3.5MHz
1
2
3
4
8
7
6
5
CS
+IN
IN
GND
V
CC
CLK
D
OUT
V
REF
LTC1197L
1197/99 TA01
ANALOG INPUT
0V TO 2.7V RANGE
2.7V
1
F
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP
OR SHIFT REGISTERS
D
U
ESCRIPTIO
S
FEATURE
The LTC
1197/LTC1197L/LTC1199/LTC1199L are
10-bit A/D converters with sampling rates up to 500kHz.
They have 2.7V (L) and 5V versions and are offered in
8-pin MSOP and SO packages. Power dissipation is typi-
cally only 2.2mW at 2.7V (25mW at 5V) during full speed
operation. The automatic power down reduces supply
current linearly as sample rate is reduced. These 10-bit,
switched-capacitor, successive approximation ADCs in-
clude a sample-and-hold. The LTC1197/LTC1197L have a
differential analog input with an adjustable reference pin.
The LTC1199/LTC1199L offer a software-selectable
2-channel MUX.
The 3-wire serial I/O, MSOP and SO-8 packages, 2.7V
operation and extremely high sample rate-to-power ratio
make these ADCs ideal choices for compact, low power
high speed systems.
These circuits can be used in ratiometric applications or
with external references. The high impedance analog
inputs and the ability to operate with reduced spans below
1V full scale (LTC1197/LTC1197L) allow direct connec-
tion to signal sources in many applications, eliminating
the need for gain stages.
s
8-Pin MSOP and SO Packages
s
10-Bit Resolution at 500ksps
s
Single Supply: 5V or 3V
s
Low Power at Full Speed:
25mW Typ at 5V
2.2mW Typ at 2.7V
s
Auto Shutdown Reduces Power Linearly
at Lower Sample Rates
s
10-Bit Upgrade to 8-Bit LTC1196/LTC1198
s
SPI and MICROWIRE
TM
Compatible Serial I/O
s
Low Cost
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
U
A
O
PPLICATI
TYPICAL
s
High Speed Data Acquisition
s
Portable or Compact Instrumentation
s
Low Power or Battery-Operated Instrumentation
U
S
A
O
PPLICATI
2
LTC1197/LTC1197L
LTC1199/LTC1199L
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
Operating Temperature Range
LTC1197C/LTC1197LC
LTC1199C/LTC1199LC ........................... 0
C to 70
C
LTC1197I/LTC1197LI
LTC1199I/LTC1199LI ........................ 45
C to 85
C
Lead Temperature (Soldering, 10 sec) ................. 300
C
Supply Voltage (V
CC
) ............................................... 12V
Voltage
Analog Input ..................... GND 0.3V to V
CC
+ 0.3V
Digital Input ................................ GND 0.3V to 12V
Digital Output .................... GND 0.3V to V
CC
+ 0.3V
Power Dissipation .............................................. 500mW
Storage Temperature Range ................. 65
C to 150
C
(Notes 1, 2)
RECO E DED OPERATI G CO DITIO S
W
U
W
U
U
U
LTC1197
LTC1199
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
CC
Supply Voltage
4
9
4
6
V
V
CC
= 5V Operation
f
CLK
Clock Frequency
q
0.05
7.2
0.05
7.2
MHz
t
CYC
Total Cycle Time
14
16
CLK
t
SMPL
Analog Input Sampling Time
1.5
1.5
CLK
t
hCS
Hold Time CS Low After Last CLK
13
13
ns
W
U
U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
MS8 PART MARKING
S8 PART MARKING
1197L
1197LI
1197
1197I
LTC1197CS8
LTC1197IS8
LTC1197LCS8
LTC1197LIS8
ORDER PART
NUMBER
LTC1197LCMS8
LTBL
T
JMAX
= 150
C,
JA
= 175
C/W
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
CS
+IN
IN
GND
V
CC
CLK
D
OUT
V
REF
ORDER PART
NUMBER
MS8 PART MARKING
S8 PART MARKING
1199L
1199LI
1199
1199I
LTC1199CS8
LTC1199IS8
LTC1199LCS8
LTC1199LIS8
ORDER PART
NUMBER
LTC1199LCMS8
LTCM
T
JMAX
= 150
C,
JA
= 210
C/W
1
2
3
4
CS
+IN
IN
GND
8
7
6
5
V
CC
CLK
D
OUT
V
REF
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
1
2
3
4
CS
CH0
CH1
GND
8
7
6
5
V
CC
CLK
D
OUT
D
IN
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150
C,
JA
= 210
C/W
T
JMAX
= 150
C,
JA
= 175
C/W
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
CS
CH0
CH1
GND
V
CC
CLK
D
OUT
D
IN
Consult factory for Military grade parts.
3
LTC1197/LTC1197L
LTC1199/LTC1199L
RECO E DED OPERATI G CO DITIO S
W
U
W
U
U
U
LTC1197
LTC1199
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
CC
= 5V Operation
t
suCS
Setup Time CS
Before First CLK
26
26
ns
(See Figures 1, 2)
t
hDI
Hold Time D
IN
After CLK
LTC1199
26
ns
t
suDI
Setup Time D
IN
Stable Before CLK
LTC1199
26
ns
t
WHCLK
CLK High Time
f
CLK
= f
CLK(MAX)
40%
40%
1/f
CLK
t
WLCLK
CLK Low Time
f
CLK
= f
CLK(MAX)
40%
40%
1/f
CLK
t
WHCS
CS High Time Between Data Transfer Cycles
32
32
ns
t
WLCS
CS Low Time During Data Transfer
13
15
CLK
V
CC
= 5V, V
REF
= 5V, f
CLK
= f
CLK(MAX)
as defined in Recommended Operating Conditions, unless otherwise noted.
CO
N
VERTER A
N
D
M
ULTIPLEXER CHARACTERISTICS
U
W
U
0.05V to V
CC
+ 0.05V
LTC1197
LTC1199
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Offset Error
q
2
2
LSB
Linearity Error
(Note 3)
q
1
1
LSB
Gain Error
q
4
4
LSB
No Missing Codes Resolution
q
10
10
Bits
Analog Input Range
V
Reference Input Range
LTC1197, V
CC
6V
0.2
V
CC
+ 0.05V
V
LTC1197, V
CC
> 6V
0.2
6
V
Analog Input Leakage Current
(Note 4)
q
1
1
A
LTC1197L
LTC1199L
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
CC
Supply Voltage
2.7
4
2.7
4
V
V
CC
= 2.7V Operation
f
CLK
Clock Frequency
q
0.01
3.5
0.01
3.5
MHz
t
CYC
Total Cycle Time
14
16
CLK
t
SMPL
Analog Input Sampling Time
1.5
1.5
CLK
t
hCS
Hold Time CS Low After Last CLK
40
40
ns
t
suCS
Setup Time CS
Before First CLK
78
78
ns
(See Figures 1, 2)
t
hDI
Hold Time D
IN
After CLK
LTC1199L
78
ns
t
suDI
Setup Time D
IN
Stable Before CLK
LTC1199L
78
ns
t
WHCLK
CLK High Time
f
CLK
= f
CLK(MAX)
40%
40%
1/f
CLK
t
WLCLK
CLK Low Time
f
CLK
= f
CLK(MAX)
40%
40%
1/f
CLK
t
WHCS
CS High Time Between Data Transfer Cycles
96
96
ns
t
WLCS
CS Low Time During Data Transfer
13
15
CLK
4
LTC1197/LTC1197L
LTC1199/LTC1199L
V
CC
= 2.7V, V
REF
= 2.5V (LTC1197L), f
CLK
= f
CLK(MAX)
as defined in Recommended Operating Conditions, unless otherwise noted.
CO
N
VERTER A
N
D
M
ULTIPLEXER CHARACTERISTICS
U
W
U
0.05V to V
CC
+ 0.05V
DY
N
A
M
IC ACCURACY
U
W
V
CC
= 5V, V
REF
= 5V, f
CLK
= f
CLK(MAX)
as defined in Recommended Operating Conditions, unless otherwise noted.
LTC1197
LTC1199
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
S/(N + D) Signal-to-Noise Plus
100kHz Input Signal
60
60
dB
Distortion Ratio
THD
Total Harmonic Distortion
100kHz Input Signal
64
64
dB
First 5 Harmonics
Peak Harmonic or Spurious Noise
100kHz Input Signal
68
68
dB
IMD
Intermodulation Distortion
f
IN1
= 97.046kHz, f
IN2
= 102.905kHz
2nd Order Terms
65
65
dB
3rd Order Terms
70
70
dB
V
CC
= 2.7V, V
REF
= 2.5V, f
CLK
= f
CLK(MAX)
as defined in Recommended Operating Conditions, unless otherwise noted.
LTC1197L
LTC1199L
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
S/(N + D) Signal-to-Noise Plus
50kHz Input Signal
58
58
dB
Distortion Ratio
THD
Total Harmonic Distortion
50kHz Input Signal
60
60
dB
First 5 Harmonics
Peak Harmonic or Spurious Noise
50kHz Input Signal
63
63
dB
IMD
Intermodulation Distortion
f
IN1
= 48.5kHz, f
IN2
= 51.5kHz
2nd Order Terms
60
60
dB
3rd Order Terms
65
65
dB
LTC1197L
LTC1199L
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Offset Error
q
2
2
LSB
Linearity Error
(Note 3)
q
1
1
LSB
Gain Error
q
4
4
LSB
No Missing Codes Resolution
q
10
10
Bits
Analog Input Range
V
Reference Input Range
LTC1197L
0.2
V
CC
+ 0.05V
V
Analog Input Leakage Current
(Note 4)
q
1
1
A
5
LTC1197/LTC1197L
LTC1199/LTC1199L
LTC1197
LTC1199
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
IH
High Level Input Voltage
V
CC
= 5.25V
q
2.4
2.4
V
V
IL
Low Level Input Voltage
V
CC
= 4.75V
q
0.8
0.8
V
I
IH
High Level Input Current
V
IN
= V
CC
q
2.5
2.5
A
I
IL
Low Level Input Current
V
IN
= 0V
q
2.5
2.5
A
V
OH
High Level Output Voltage
V
CC
= 4.75V, I
O
= 10
A
q
4.5
4.74
4.5
4.74
V
V
CC
= 4.75V, I
O
= 360
A
q
2.4
4.72
2.4
4.72
V
V
OL
Low Level Output Voltage
V
CC
= 4.75V, I
O
= 1.6mA
q
0.4
0.4
V
I
OZ
Hi-Z Output Leakage
CS = High
q
3
3
A
I
SOURCE
Output Source Current
V
OUT
= 0V
25
25
mA
I
SINK
Output Sink Current
V
OUT
= V
CC
45
45
mA
I
REF
Reference Current (LTC1197)
CS = V
CC
q
0.001
3
A
f
SMPL
= f
SMPL(MAX)
q
0.5
1
mA
I
CC
Supply Current
CS = V
CC
q
0.001
3
0.001
3
A
f
SMPL
= f
SMPL(MAX)
q
4.5
8
5
8.5
mA
P
D
Power Dissipation
f
SMPL
= f
SMPL(MAX)
22.5
25
mW
V
CC
= 5V, V
REF
= 5V, unless otherwise noted.
DIGITAL A
N
D DC ELECTRICAL CHARACTERISTICS
U
V
CC
= 2.7V, V
REF
= 2.5V, unless otherwise noted.
LTC1197L
LTC1199L
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
IH
High Level Input Voltage
V
CC
= 3.6V
q
1.9
1.9
V
V
IL
Low Level Input Voltage
V
CC
= 2.7V
q
0.45
0.45
V
I
IH
High Level Input Current
V
IN
= V
CC
q
2.5
2.5
A
I
IL
Low Level Input Current
V
IN
= 0V
q
2.5
2.5
A
V
OH
High Level Output Voltage
V
CC
= 2.7V, I
O
= 10
A
q
2.3
2.60
2.3
2.60
V
V
CC
= 2.7V, I
O
= 360
A
q
2.1
2.45
2.1
2.45
V
V
OL
Low Level Output Voltage
V
CC
= 2.7V, I
O
= 400
A
q
0.3
0.3
V
I
OZ
Hi-Z Output Leakage
CS = High
q
3
3
A
I
SOURCE
Output Source Current
V
OUT
= 0V
6.5
6.5
mA
I
SINK
Output Sink Current
V
OUT
= V
CC
11
11
mA
I
REF
Reference Current (LTC1197L)
CS = V
CC
q
0.001
3.0
A
f
SMPL
= f
SMPL(MAX)
q
0.250
0.5
mA
I
CC
Supply Current
CS = V
CC
q
0.001
3
0.001
3
A
f
SMPL
= f
SMPL(MAX)
q
0.8
2
0.8
2
mA
P
D
Power Dissipation
f
SMPL
= f
SMPL(MAX)
2.2
2.2
mW
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