1
LTC1196/LTC1198
S
FEATURE
8-Bit, SO-8, 1MSPS ADCs with
Auto-Shutdown Options
s
High Sampling Rates: 1MHz (LTC1196)
750kHz (LTC1198)
s
Low Cost
s
SO-8 Plastic Package
s
Single Supply 3V and 5V Specifications
s
Low Power: 10mW at 3V Supply
50mW at 5V Supply
s
Auto-Shutdown: 1nA Typical (LTC1198)
s
1/2LSB Total Unadjusted Error over Temperature
s
3-Wire Serial I/O
s
1V to 5V Input Span Range (LTC1196)
s
Converts 1MHz Inputs to 7 Effective Bits
s
Differential Inputs (LTC1196)
s
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.
D
U
ESCRIPTIO
U
S
A
O
PPLICATI
s
High Speed Data Acquisition
s
Disk Drives
s
Portable or Compact Instrumentation
s
Low Power or Battery-Operated Systems
U
A
O
PPLICATI
TYPICAL
Single 5V Supply, 1MSPS, 8-Bit Sampling ADC
Effective Bits and S/(N + D) vs Input Frequency
INPUT FREQUENCY (Hz)
1k
S/(N + D) (dB)
8
7
6
5
4
3
2
1
0
10k
100k
1M
1196/98 G24
50
44
EFFECTIVE NUMBER OF BITS (ENOBs)
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)
T
A
= 25C
5V
1
F
ANALOG INPUT
0V TO 5V RANGE
1196/98 TA01
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP,
OR SHIFT REGISTERS
IN
GND
V
CC
CLK
D
OUT
+IN
CS
1
2
3
4
8
7
6
5
LTC1196
(SO-8)
V
REF
2
LTC1196/LTC1198
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
(Notes 1, 2)
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
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
LTC1196-1
LTC1196-2
LTC1198-1
LTC1198-2
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
CC
Supply Voltage
2.7
6
2.7
6
V
V
CC
= 5V Operation
f
CLK
Clock Frequency
0.01
14.4
0.01
12.0
MHz
q
0.01
12.0
0.01
9.6
MHz
t
CYC
Total Cycle Time
LTC1196
12
12
CLK
LTC1198
16
16
CLK
t
SMPL
Analog Input Sampling Time
2.5
2.5
CLK
t
hCS
Hold Time CS Low After Last CLK
10
13
ns
t
suCS
Setup Time CS
Before First CLK
20
26
ns
(See Figures 1, 2)
t
hDI
Hold Time D
IN
After CLK
LTC1198
20
26
ns
W
U
U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER*
LTC1196-1ACS8
LTC1196-1BCS8
LTC1196-2ACS8
LTC1196-2BCS8
1961A
1961B
1962A
1962B
S8 PART MARKING
ORDER PART
NUMBER*
LTC1198-1ACS8
LTC1198-1BCS8
LTC1198-2ACS8
LTC1198-2BCS8
S8 PART MARKING
1981A
1981B
1982A
1982B
*Parts available in N8 package. Consult factory for N8 samples.
1
2
3
4
8
7
6
5
TOP VIEW
V
CC
(V
REF
)
CLK
D
OUT
D
IN
CH0
CH1
GND
S8 PACKAGE
8-LEAD PLASTIC SOIC
CS/
SHUTDOWN
T
JMAX
= 150
C,
JA
= 175
C/W
T
JMAX
= 150
C,
JA
= 175
C/W
1
2
3
4
8
7
6
5
TOP VIEW
V
CC
CLK
D
OUT
V
REF
S8 PACKAGE
8-LEAD PLASTIC SOIC
CS
+IN
IN
GND
RECO E DED OPERATI G CO DITIO S
W
U
W
U
U
U
3
LTC1196/LTC1198
RECO E DED OPERATI G CO DITIO S
W
U
W
U
U
U
LTC1196-1
LTC1196-2
LTC1198-1
LTC1198-2
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
CO VERTER A D ULTIPLEXER CHARACTERISTICS
U
U W
ELECTRICAL C
C
HARA TER STICS
DIGITAL A D
U
I
DC
V
CC
= 5V, V
REF
= 5V, unless otherwise noted.
0.05V to V
CC
+ 0.05V
t
suDI
Setup Time D
IN
Stable Before CLK
LTC1198
20
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
25
32
ns
t
WLCS
CS Low Time During Data Transfer
LTC1196
11
11
CLK
LTC1198
15
15
CLK
V
CC
= 5V, V
REF
= 5V, f
CLK
= f
CLK(MAX)
as defined in Recommended Operating Conditions, unless otherwise noted.
LTC1196-XA
LTC1196-XB
LTC1198-XA
LTC1198-XB
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
No Missing Codes Resolution
q
8
8
Bits
Offset Error
q
1/2
1
LSB
Linearity Error
(Note 3)
q
1/2
1
LSB
Full-Scale Error
q
1/2
1
LSB
Total Unadjusted Error (Note 4)
LTC1196, V
REF
= 5.000V
q
1/2
1
LSB
LTC1198, V
CC
= 5.000V
Analog and REF Input Range
LTC1196
V
Analog Input Leakage Current
(Note 5)
q
1
1
A
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
IH
High Level Input Voltage
V
CC
= 5.25V
q
2.0
V
V
IL
Low Level Input Voltage
V
CC
= 4.75V
q
0.8
V
I
IH
High Level Input Current
V
IN
= V
CC
q
2.5
A
I
IL
Low Level Input Current
V
IN
= 0V
q
2.5
A
V
OH
High Level Output Voltage
V
CC
= 4.75V, I
O
= 10
A
q
4.5
4.74
V
V
CC
= 4.75V, I
O
= 360
A
q
2.4
4.71
V
V
OL
Low Level Output Voltage
V
CC
= 4.75V, I
O
= 1.6mA
q
0.4
V
I
OZ
Hi-Z Output Leakage
CS = High
q
3
A
I
SOURCE
Output Source Current
V
OUT
= 0V
25
mA
I
SINK
Output Sink Current
V
OUT
= V
CC
45
mA
I
REF
Reference Current, LTC1196
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
, LTC1198 (Shutdown)
q
0.001
3
A
CS = V
CC
, LTC1196
q
7
15
mA
f
SMPL
= f
SMPL(MAX),
LTC1196/LTC1198
q
11
20
mA
4
LTC1196/LTC1198
V
CC
= 5V, V
REF
= 5V, f
CLK
= f
CLK(MAX)
as defined in Recommended Operating Conditions, unless otherwise noted.
DY A IC ACCURACY
U W
RECO E DED OPERATI G CO DITIO S
W
U
W
U
U
U
AC CHARACTERISTICS
V
CC
= 5V, V
REF
= 5V, f
CLK
= f
CLK(MAX)
as defined in Recommended Operating Conditions, unless otherwise noted.
V
CC
= 2.7V Operation
LTC1196
LTC1198
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
S/(N + D)
Signal-to-Noise Plus Distortion
500kHz/1MHz Input Signal
47/45
47/45
dB
THD
Total Harmonic Distortion
500kHz/1MHz Input Signal
49/47
49/47
dB
Peak Harmonic or Spurious Noise
500kHz/1MHz Input Signal
55/48
55/48
dB
IMD
Intermodulation Distortion
f
IN1
= 499.37kHz,
51
51
dB
f
IN2
= 502.446kHz
Full Power Bandwidth
8
8
MHz
Full Linear Bandwidth [S/(N + D) > 44dB]
1
1
MHz
LTC1196-1
LTC1196-2
LTC1198-1
LTC1198-2
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
f
CLK
Clock Frequency
0.01
5.4
0.01
4
MHz
q
0.01
4.6
0.01
3
MHz
t
CYC
Total Cycle Time
LTC1196
12
12
CLK
LTC1198
16
16
CLK
t
SMPL
Analog Input Sampling Time
2.5
2.5
CLK
t
hCS
Hold Time CS Low After Last CLK
20
40
ns
t
suCS
Setup Time CS
Before First CLK
40
78
ns
(See Figures 1, 2)
LTC1196-1
LTC1196-2
LTC1198-1
LTC1198-2
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
t
CONV
Conversion Time (See Figures 1, 2)
600
710
ns
q
710
900
ns
f
SMPL(MAX)
Maximum Sampling Frequency
LTC1196
1.20
1.00
MHz
LTC1196
q
1.00
0.80
MHz
LTC1198
0.90
0.75
MHz
LTC1198
q
0.75
0.60
MHz
t
dDO
Delay Time, CLK
to D
OUT
Data Valid
C
LOAD
= 20pF
55
64
68
78
ns
q
73
94
ns
t
DIS
Delay Time CS
to D
OUT
Hi-Z
q
70
120
88
150
ns
t
en
Delay Time, CLK
to D
OUT
Enabled
C
LOAD
= 20pF
q
30
50
43
63
ns
t
hDO
Time Output Data Remains Valid
C
LOAD
= 20pF
q
30
45
30
55
ns
After CLK
t
r
D
OUT
Fall Time
C
LOAD
= 20pF
q
5
15
10
20
ns
t
f
D
OUT
Rise Time
C
LOAD
= 20pF
q
5
15
10
20
ns
C
IN
Input Capacitance
Analog Input On Channel
30
30
pF
Analog Input Off Channel
5
5
pF
Digital Input
5
5
pF
5
LTC1196/LTC1198
RECO E DED OPERATI G CO DITIO S
W
U
W
U
U
U
V
CC
= 2.7V Operation
CO VERTER A D ULTIPLEXER CHARACTERISTICS
U
U W
V
CC
= 2.7V, V
REF
= 2.5V, f
CLK
= f
CLK(MAX)
as defined in Recommended Operating Conditions, unless otherwise noted.
ELECTRICAL C
C
HARA TER STICS
DIGITAL A D
U
I
DC
V
CC
= 2.7V, V
REF
= 2.5V, unless otherwise noted.
0.05V to V
CC
+ 0.05V
LTC1196-1
LTC1196-2
LTC1198-1
LTC1198-2
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
t
hDI
Hold Time D
IN
After CLK
LTC1198
40
78
ns
t
suDI
Setup Time D
IN
Stable Before CLK
LTC1198
40
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
50
96
ns
t
WLCS
CS Low Time During Data Transfer
LTC1196
11
11
CLK
LTC1198
15
15
CLK
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
IH
High Level Input Voltage
V
CC
= 3.6V
q
1.9
V
V
IL
Low Level Input Voltage
V
CC
= 2.7V
q
0.45
V
I
IH
High Level Input Current
V
IN
= V
CC
q
2.5
A
I
IL
Low Level Input Current
V
IN
= 0V
q
2.5
A
V
OH
High Level Output Voltage
V
CC
= 2.7V, I
O
= 10
A
q
2.3
2.60
V
V
CC
= 2.7V, I
O
= 360
A
q
2.1
2.45
V
V
OL
Low Level Output Voltage
V
CC
= 2.7V, I
O
= 400
A
q
0.3
V
I
OZ
Hi-Z Output Leakage
CS = High
q
3
A
I
SOURCE
Output Source Current
V
OUT
= 0V
10
mA
I
SINK
Output Sink Current
V
OUT
= V
CC
15
mA
I
REF
Reference Current, LTC1196
CS = V
CC
q
0.001
3.0
A
f
SMPL
= f
SMPL(MAX)
q
0.25
0.5
mA
I
CC
Supply Current
CS = V
CC
= 3.3V, LTC1198 (Shutdown)
q
0.001
3.0
A
CS = V
CC
= 3.3V, LTC1196
q
1.5
4.5
mA
f
SMPL
= f
SMPL(MAX),
LTC1196/LTC1198
q
2.0
6.0
mA
LTC1196-XA
LTC1196-XB
LTC1198-XA
LTC1198-XB
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
No Missing Codes Resolution
q
8
8
Bits
Offset Error
q
1/2
1
LSB
Linearity Error
(Note 3)
q
1/2
1
LSB
Full-Scale Error
q
1/2
1
LSB
Total Unadjusted Error (Note 4)
LTC1196, V
REF
= 2.500V
q
1/2
1
LSB
LTC1198, V
CC
= 2.700V
Analog and REF Input Range
LTC1196
V
Analog Input Leakage Current
(Note 5)
q
1
1
A
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