LTC1196/LTC1198
8-Bit, SO-8, 1MSPS ADCs with
Auto-Shutdown Options
FEATURES
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
High Sampling Rates: 1MHz (LTC1196)
750kHz (LTC1198)
Low Cost
SO-8 Plastic Package
Single Supply 3V and 5V Specifications
Low Power: 10mW at 3V Supply
50mW at 5V Supply
Auto-Shutdown: 1nA Typical (LTC1198)
±1/2LSB
Total Unadjusted Error over Temperature
3-Wire Serial I/O
1V to 5V Input Span Range (LTC1196)
Converts 1MHz Inputs to 7 Effective Bits
Differential Inputs (LTC1196)
2-Channel MUX (LTC1198)
The LTC1196/LTC1198 are 600ns, 8-bit A/D converters
with sampling rates up to 1MHz. They are offered in 8-pin
SO packages and operate on 3V to 6V supplies. Power
dissipation is only 10mW with a 3V supply or 50mW with
a 5V supply. The LTC1198 automatically powers down to
a typical supply current of 1nA whenever it is not perform-
ing conversions. These 8-bit switched-capacitor succes-
sive approximation ADCs include sample-and-holds. The
LTC1196 has a differential analog input; the LTC1198
offers a software selectable 2-channel MUX.
The 3-wire serial I/O, SO-8 packages, 3V operation and
extremely high sample rate-to-power ratio make these
ADCs an ideal choice for compact, high speed systems.
These ADCs 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 (LTC1196) allow direct connection to signal sources
in many applications, eliminating the need for gain stages.
The A grade devices are specified with total unadjusted
error of
±1/2LSB
maximum over temperature.
APPLICATI
s
s
s
s
S
High Speed Data Acquisition
Disk Drives
Portable or Compact Instrumentation
Low Power or Battery-Operated Systems
TYPICAL APPLICATI
Single 5V Supply, 1MSPS, 8-Bit Sampling ADC
1µF
5V
Effective Bits and S/(N + D) vs Input Frequency
8
EFFECTIVE NUMBER OF BITS (ENOBs)
7
6
5
4
3
2
1
0
1k
V
REF
= V
CC
= 2.7V
f
SMPL
= 383kHz (LTC1196)
f
SMPL
= 287kHz (LTC1198)
V
REF
= V
CC
= 5V
f
SMPL
= 1MHz (LTC1196)
f
SMPL
= 750kHz (LTC1198)
1
2
ANALOG INPUT
0V TO 5V RANGE
CS
+IN
V
CC
8
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP,
OR SHIFT REGISTERS
7
LTC1196 CLK
(SO-8)
3
6
–IN
D
OUT
4
5
GND
V
REF
1196/98 TA01
T
A
= 25°C
10k
100k
INPUT FREQUENCY (Hz)
1M
1196/98 G24
U
50
44
S/(N + D) (dB)
UO
UO
1
LTC1196/LTC1198
ABSOLUTE
AXI U
RATI GS
(Notes 1, 2)
Operating Temperature Range
LTC1196-1AC, LTC1198-1AC, LTC1196-1BC,
LTC1198-1BC, LTC1196-2AC, LTC1198-2AC,
LTC1196-2BC, LTC1198-2BC................ 0°C to 70°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
Supply Voltage (V
CC
) to GND .................................... 7V
Voltage
Analog Reference ...................... –0.3V to V
CC
+ 0.3V
Digital Inputs.......................................... –0.3V to 7V
Digital Outputs .......................... –0.3V to V
CC
+ 0.3V
Power Dissipation ............................................. 500mW
PACKAGE/ORDER I FOR ATIO
TOP VIEW
CS 1
+IN 2
–IN 3
GND 4
8
7
6
5
V
CC
CLK
D
OUT
V
REF
ORDER PART
NUMBER*
TOP VIEW
LTC1196-1ACS8
LTC1196-1BCS8
LTC1196-2ACS8
LTC1196-2BCS8
S8 PART MARKING
1961A
1961B
1962A
1962B
S8 PACKAGE
8-LEAD PLASTIC SOIC
T
JMAX
= 150°C,
θ
JA
= 175°C/W
*Parts
available in N8 package. Consult factory for N8 samples.
RECO
SYMBOL
V
CC
f
CLK
t
CYC
t
SMPL
t
hCS
t
suCS
t
hDI
E DED OPERATI G CO DITIO S
CONDITIONS
LTC1196-1
LTC1198-1
MIN TYP
MAX
2.7
0.01
0.01
12
16
2.5
10
20
LTC1198
20
6
14.4
12.0
LTC1196-2
LTC1198-2
MIN
TYP
MAX
2.7
0.01
0.01
12
16
2.5
13
26
26
6
12.0
9.6
UNITS
V
MHz
MHz
CLK
CLK
CLK
ns
ns
ns
PARAMETER
Supply Voltage
Clock Frequency
V
CC
= 5V Operation
q
Total Cycle Time
Analog Input Sampling Time
Hold Time CS Low After Last CLK↑
Setup Time CS↓ Before First CLK↑
(See Figures 1, 2)
Hold Time D
IN
After CLK↑
LTC1196
LTC1198
2
U
U
U
U
U
W
W W
U
W
ORDER PART
NUMBER*
CS/ 1
SHUTDOWN
CH0 2
CH1 3
GND 4
8
7
6
5
V
CC
(V
REF
)
CLK
D
OUT
D
IN
LTC1198-1ACS8
LTC1198-1BCS8
LTC1198-2ACS8
LTC1198-2BCS8
S8 PART MARKING
1981A
1981B
1982A
1982B
S8 PACKAGE
8-LEAD PLASTIC SOIC
T
JMAX
= 150°C,
θ
JA
= 175°C/W
U WW
LTC1196/LTC1198
RECO
SYMBOL
t
suDI
t
WHCLK
t
WLCLK
t
WHCS
t
WLCS
E DED OPERATI G CO DITIO S
CONDITIONS
LTC1198
f
CLK
= f
CLK(MAX)
f
CLK
= f
CLK(MAX)
LTC1196
LTC1198
LTC1196-1
LTC1198-1
MIN TYP
MAX
20
40%
40%
25
11
15
LTC1196-2
LTC1198-2
MIN
TYP
MAX
26
40%
40%
32
11
15
UNITS
ns
1/f
CLK
1/f
CLK
ns
CLK
CLK
PARAMETER
Setup Time D
IN
Stable Before CLK↑
CLK High Time
CLK Low Time
CS High Time Between Data Transfer Cycles
CS Low Time During Data Transfer
CO VERTER A D
PARAMETER
No Missing Codes Resolution
Offset Error
Linearity Error
Full-Scale Error
Total Unadjusted Error (Note 4)
Analog and REF Input Range
Analog Input Leakage Current
ULTIPLEXER CHARACTERISTICS
CONDITIONS
q
q
V
CC
= 5V, V
REF
= 5V, f
CLK
= f
CLK(MAX)
as defined in Recommended Operating Conditions, unless otherwise noted.
LTC1196-XA
LTC1198-XA
MIN TYP
MAX
8
±1/2
±1/2
±1/2
±1/2
– 0.05V to V
CC
+ 0.05V
q
(Note 3)
LTC1196, V
REF
= 5.000V
LTC1198, V
CC
= 5.000V
LTC1196
(Note 5)
q
q
q
DIGITAL A D DC ELECTRICAL CHARACTERISTICS
V
CC
= 5V, V
REF
= 5V, unless otherwise noted.
SYMBOL
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
I
OZ
I
SOURCE
I
SINK
I
REF
I
CC
PARAMETER
High Level Input Voltage
Low Level Input Voltage
High Level Input Current
Low Level Input Current
High Level Output Voltage
Low Level Output Voltage
Hi-Z Output Leakage
Output Source Current
Output Sink Current
Reference Current, LTC1196
Supply Current
CONDITIONS
V
CC
= 5.25V
V
CC
= 4.75V
V
IN
= V
CC
V
IN
= 0V
V
CC
= 4.75V, I
O
= 10µA
V
CC
= 4.75V, I
O
= 360µA
V
CC
= 4.75V, I
O
= 1.6mA
CS = High
V
OUT
= 0V
V
OUT
= V
CC
CS = V
CC
f
SMPL
= f
SMPL(MAX)
CS = V
CC
, LTC1198 (Shutdown)
CS = V
CC
, LTC1196
f
SMPL
= f
SMPL(MAX),
LTC1196/LTC1198
q
q
q
q
q
q
q
q
q
q
q
q
q
U
U
U
W U
U WW
U
U
LTC1196-XB
LTC1198-XB
MIN
TYP
MAX
8
±1
±1
±1
±1
UNITS
Bits
LSB
LSB
LSB
LSB
V
±1
±1
µA
MIN
2.0
TYP
MAX
0.8
2.5
– 2.5
UNITS
V
V
µA
µA
V
V
4.5
2.4
4.74
4.71
0.4
±3
– 25
45
0.001
0.5
0.001
7
11
3
1
3
15
20
V
µA
mA
mA
µA
mA
µA
mA
mA
3
LTC1196/LTC1198
DY A IC ACCURACY
V
CC
= 5V, V
REF
= 5V, f
CLK
= f
CLK(MAX)
as defined in Recommended Operating Conditions, unless otherwise noted.
SYMBOL
S/(N + D)
THD
IMD
PARAMETER
Signal-to-Noise Plus Distortion
Total Harmonic Distortion
Peak Harmonic or Spurious Noise
Intermodulation Distortion
Full Power Bandwidth
Full Linear Bandwidth [S/(N + D) > 44dB]
CONDITIONS
500kHz/1MHz Input Signal
500kHz/1MHz Input Signal
500kHz/1MHz Input Signal
f
IN1
= 499.37kHz,
f
IN2
= 502.446kHz
MIN
LTC1196
TYP
MAX
47/45
49/47
55/48
51
8
1
MIN
LTC1198
TYP
MAX
47/45
49/47
55/48
51
8
1
UNITS
dB
dB
dB
dB
MHz
MHz
AC CHARACTERISTICS
V
CC
= 5V, V
REF
= 5V, f
CLK
= f
CLK(MAX)
as defined in Recommended Operating Conditions, unless otherwise noted.
LTC1196-1
LTC1198-1
MIN TYP
MAX
q
SYMBOL
t
CONV
f
SMPL(MAX)
Maximum Sampling Frequency
t
dDO
t
DIS
t
en
t
hDO
t
r
t
f
C
IN
RECO
SYMBOL
f
CLK
t
CYC
t
SMPL
t
hCS
t
suCS
E DED OPERATI G CO DITIO S
CONDITIONS
q
V
CC
= 2.7V Operation
LTC1196-1
LTC1198-1
MIN TYP
MAX
0.01
0.01
12
16
2.5
20
40
5.4
4.6
LTC1196-2
LTC1198-2
MIN
TYP
MAX
0.01
0.01
12
16
2.5
40
78
4
3
PARAMETER
Clock Frequency
Total Cycle Time
Analog Input Sampling Time
Hold Time CS Low After Last CLK↑
Setup Time CS↓ Before First CLK↑
(See Figures 1, 2)
LTC1196
LTC1198
4
U
U
U
U WW
WU
PARAMETER
Conversion Time (See Figures 1, 2)
CONDITIONS
LTC1196-2
LTC1198-2
MIN
TYP
MAX
710
900
1.00
0.80
0.75
0.60
UNITS
ns
ns
MHz
MHz
MHz
MHz
600
710
1.20
1.00
0.90
0.75
55
64
73
120
50
30
15
15
LTC1196
LTC1196
LTC1198
LTC1198
C
LOAD
= 20pF
q
q
q
Delay Time, CLK↑ to D
OUT
Data Valid
Delay Time CS↑ to D
OUT
Hi-Z
Delay Time, CLK↓ to D
OUT
Enabled
Time Output Data Remains Valid
After CLK↑
D
OUT
Fall Time
D
OUT
Rise Time
Input Capacitance
68
88
43
55
10
10
30
5
5
78
94
150
63
ns
ns
ns
ns
ns
q
70
30
30
45
5
5
30
5
5
C
LOAD
= 20pF
C
LOAD
= 20pF
C
LOAD
= 20pF
C
LOAD
= 20pF
Analog Input On Channel
Analog Input Off Channel
Digital Input
q
q
q
q
20
20
ns
ns
pF
pF
pF
UNITS
MHz
MHz
CLK
CLK
CLK
ns
ns
LTC1196/LTC1198
RECO
SYMBOL
t
hDI
t
suDI
t
WHCLK
t
WLCLK
t
WHCS
t
WLCS
E DED OPERATI G CO DITIO S
CONDITIONS
LTC1198
LTC1198
f
CLK
= f
CLK(MAX)
f
CLK
= f
CLK(MAX)
LTC1196
LTC1198
LTC1196-1
LTC1198-1
MIN TYP
MAX
40
40
40%
40%
50
11
15
LTC1196-2
LTC1198-2
MIN
TYP
MAX
78
78
40%
40%
96
11
15
UNITS
ns
ns
1/f
CLK
1/f
CLK
ns
CLK
CLK
V
CC
= 2.7V Operation
PARAMETER
Hold Time D
IN
After CLK↑
Setup Time D
IN
Stable Before CLK↑
CLK High Time
CLK Low Time
CS High Time Between Data Transfer Cycles
CS Low Time During Data Transfer
CO VERTER A D
PARAMETER
No Missing Codes Resolution
Offset Error
Linearity Error
Full-Scale Error
Total Unadjusted Error (Note 4)
Analog and REF Input Range
Analog Input Leakage Current
ULTIPLEXER CHARACTERISTICS
CONDITIONS
q
q
V
CC
= 2.7V, V
REF
= 2.5V, f
CLK
= f
CLK(MAX)
as defined in Recommended Operating Conditions, unless otherwise noted.
LTC1196-XA
LTC1198-XA
MIN TYP
MAX
8
±1/2
±1/2
±1/2
±1/2
– 0.05V to V
CC
+ 0.05V
q
(Note 3)
LTC1196, V
REF
= 2.500V
LTC1198, V
CC
= 2.700V
LTC1196
(Note 5)
q
q
q
DIGITAL A D DC ELECTRICAL CHARACTERISTICS
V
CC
= 2.7V, V
REF
= 2.5V, unless otherwise noted.
SYMBOL
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
I
OZ
I
SOURCE
I
SINK
I
REF
I
CC
PARAMETER
High Level Input Voltage
Low Level Input Voltage
High Level Input Current
Low Level Input Current
High Level Output Voltage
Low Level Output Voltage
Hi-Z Output Leakage
Output Source Current
Output Sink Current
Reference Current, LTC1196
Supply Current
CONDITIONS
V
CC
= 3.6V
V
CC
= 2.7V
V
IN
= V
CC
V
IN
= 0V
V
CC
= 2.7V, I
O
= 10µA
V
CC
= 2.7V, I
O
= 360µA
V
CC
= 2.7V, I
O
= 400µA
CS = High
V
OUT
= 0V
V
OUT
= V
CC
CS = V
CC
f
SMPL
= f
SMPL(MAX)
CS = V
CC
= 3.3V, LTC1198 (Shutdown)
CS = V
CC
= 3.3V, LTC1196
f
SMPL
= f
SMPL(MAX),
LTC1196/LTC1198
q
q
q
q
q
q
q
q
q
q
q
q
q
U
U
U
W U
U WW
U
U
LTC1196-XB
LTC1198-XB
MIN
TYP
MAX
8
±1
±1
±1
±1
UNITS
Bits
LSB
LSB
LSB
LSB
V
±1
±1
µA
MIN
1.9
TYP
MAX
0.45
2.5
– 2.5
UNITS
V
V
µA
µA
V
V
2.3
2.1
2.60
2.45
0.3
±3
– 10
15
0.001
0.25
0.001
1.5
2.0
3.0
0.5
3.0
4.5
6.0
V
µA
mA
mA
µA
mA
µA
mA
mA
5
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