Linear Technology LTC1098LCS8, LTC1098L, LTC1096LAIS8, LTC1096LACS8, LTC1096LIS8 Datasheet
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FEATURES
■Specified at 2.65V Minimum Supply
■Maximum Supply Current: 80μA
■Auto Shutdown to 1nA
■8-Pin SO Package
■On-Chip Sample-and-Hold
■Conversion Time: 32μs
■Sample Rates: 16.5ksps
■I/O Compatible with SPI, MICROWIRETM, etc.
APPLICATIOUS
■Battery-Operated Systems
■Remote Data Acquisition
■Isolated Data Acquisition
■Battery Monitoring
■Temperature Measurement
Final Electrical Specifications
LTC1096L/LTC1098L
Low Voltage, Micropower
Sampling 8-Bit Serial I/O
A/D Converters
December 1995
DESCRIPTIOU
The LTC®1096L/LTC1098L are 3V micropower, 8-bit successive approximation sampling A/D converters. They typically draw only 40μA of supply current when converting and automatically power down to a typical supply current of 1nA between conversions. They are packaged in 8-pin SO packages and operate on a 3V supply. These 8- bit, switched capacitor, successive approximation ADCs include a sample-and-hold. The LTC1096L has a single differential analog input. The LTC1098L offers a software selectable 2-channel multiplexed input.
On-chip serial ports allow efficient data transfer to a wide range of microprocessors and microcontrollers over three wires. This, coupled with micropower consumption, makes remote location possible and facilitates transmitting data through isolation barriers.
The circuits can be used in ratiometric applications or with an external reference. The high impedance analog inputs and the ability to operate with reduced spans (to 1V full scale) allow direct connection to sensors and transducers in many applications, eliminating the need for gain stages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a registered trademark of National Semiconductor Corporation.
TYPICAL APPLICATIOU
10μW, SO-8 Package, 8-Bit A/D Converter
Samples at 200Hz and Runs Off a 3V Battery
1μF 3V
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1 |
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8 |
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MPU |
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CS/ |
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VCC |
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2 |
SHDN |
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7 |
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SERIAL DATA LINK |
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ANALOG INPUT |
+IN |
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CLK |
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(MICROWIRE AND |
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3 |
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LTC1096L |
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6 |
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SPI COMPATIBLE) |
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0V TO 3V RANGE |
–IN |
DOUT |
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4 |
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5 |
SERIAL DATA LINK |
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GND |
VREF |
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1096/8 |
TA01 |
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Supply Current vs Sample Rate
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(μA) |
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CC |
100 |
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I |
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CURRENT, |
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SUPPLY |
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10 |
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1 |
0.1 |
1 |
10 |
100 |
SAMPLE FREQUENCY (kHz)
1096/8 TA02
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. |
1 |
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However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- |
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tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. |
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LTC1096L/LTC1098L
ABSOLUTE
WAXIWUW
RATIUGS (Notes 1 and 2)
Supply Voltage (VCC) to GND |
................................... 12V |
Operating Temperature |
0°C to 70°C |
Voltage |
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LTC1096LAC/LTC1098LAC .................... |
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Analog and Reference ................ |
–0.3V to V CC + 0.3V |
LTC1096LAI/LTC1098LAI .................. |
– 40°C to 85°C |
Digital Inputs......................................... |
–0.3V to 12V |
LTC1096LC/LTC1098LC......................... |
0°C to 70°C |
Digital Outputs ........................... |
–0.3V to V CC + 0.3V |
LTC1096LI/LTC1098LI ....................... |
– 40°C to 85°C |
Power Dissipation.............................................. |
500mW |
Storage Temperature Range ................. |
– 65°c to 150°C |
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Lead Temperature (Soldering, 10 sec.)................ |
300°C |
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PACKAGE/ORDER IUFORWATIOU |
(Note 3) |
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TOP VIEW |
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CS/ |
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1 |
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8 |
VCC |
SHDN |
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+IN |
2 |
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7 |
CLK |
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–IN |
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DOUT |
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3 |
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6 |
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GND |
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VREF |
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4 |
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5 |
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S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 175°C/W
ORDER PART
NUMBER
LTC1096LACS8
LTC1096LAIS8
LTC1096LCS8
LTC1096LIS8
S8 PART MARKING
096LIA
1096LA
1096LI
1096L
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TOP VIEW |
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CS/ |
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1 |
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8 |
VCC(VREF) |
SHDN |
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CH0 |
2 |
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7 |
CLK |
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CH1 |
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DOUT |
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3 |
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6 |
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GND |
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DIN |
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4 |
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5 |
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S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 175°C/W
ORDER PART
NUMBER
LTC1098LACS8
LTC1098LAIS8
LTC1098LCS8
LTC1098LIS8
S8 PART MARKING
098LIA
1098LA
1098LI
1098L
Consult factory for Military grade parts.
RECOWWEUDED OPERATIUG COUDITIOUS
SYMBOL |
PARAMETER |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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VCC |
Supply Voltage |
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2.65 |
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4.0 |
V |
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fCLK |
Clock Frequency |
VCC = 2.65V |
25 |
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250 |
kHz |
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tCYC |
Total Cycle Time |
LTC1096L, fCLK = 250kHz |
58 |
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μs |
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LTC1098L, fCLK = 250kHz |
58 |
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μs |
thDI |
Hold Time, DIN After CLK− |
VCC = 2.65V |
450 |
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ns |
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tsuCS |
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Setup Time |
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↓ Before First CLK− (See Operating Sequence) |
VCC = 2.65V, LTC1096L |
1 |
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μs |
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CS |
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VCC = 2.65V, LTC1098L |
1 |
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μs |
tWAKEUP |
Wakeup Time |
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↓ Before First CLK↓ After First CLK− |
VCC = 2.65V, LTC1096L |
10 |
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μs |
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CS |
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(See Figure 1, LTC1096L Operating Sequence) |
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Wakeup Time |
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↓ Before MSBF Bit CLK↓ |
VCC = 2.65V, LTC1098L |
10 |
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μs |
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CS |
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(See Figure 2, LTC1098L Operating Sequence) |
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tsuDI |
Setup Time, DIN Stable Before CLK− |
VCC = 2.65V |
1 |
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μs |
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tWHCLK |
CLK High Time |
VCC = 2.65V |
1.6 |
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μs |
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tWLCLK |
CLK Low Time |
VCC = 2.65V |
1.6 |
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μs |
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tWHCS |
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High Time Between Data Transfer Cycles |
VCC = 2.65V |
2 |
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μs |
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CS |
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Low Time During Data Transfer |
LTC1096L, fCLK = 250kHz |
56 |
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μs |
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tWLCS |
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CS |
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LTC1098L, fCLK = 250kHz |
56 |
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μs |
2
LTC1096L/LTC1098L
COUVERTER AUD WULTIPLEXER CHARACTERISTICS
VCC = 2.65V, VREF = 2.5V, fCLK = 250kHz, unless otherwise noted.
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LTC1096LA/LTC1098LA |
LTC1096L/LTC1098L |
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PARAMETER |
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CONDITIONS |
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MIN TYP MAX |
MIN TYP MAX |
UNITS |
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Resolution (No Missing Code) |
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● |
8 |
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8 |
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Bits |
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Offset Error |
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(Note 4) |
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±0.5 |
±1 |
LSB |
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Linearity Error |
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±0.5 |
±1 |
LSB |
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Full Scale Error |
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±0.5 |
±1 |
LSB |
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Total Unadjusted Error (Note 5) |
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VREF = 2.5V |
● |
±1 |
±1.5 |
LSB |
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Analog Input Range |
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(Note 6) |
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– 0.05V to VCC + 0.05V |
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V |
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REF Input Range (Note 6) |
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2.65 £ VCC £ 4.0V |
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– 0.05V to VCC + 0.05V |
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V |
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Analog Input Leakage Current |
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(Note 7) |
● |
±1 |
±1 |
mA |
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U |
D DC |
ELECTRICAL CHARACTERISTICS |
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DIGITAL A |
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VCC = 2.65V, VREF = 2.5V, fCLK = 250kHz, unless otherwise noted.
SYMBOL |
PARAMETER |
CONDITIONS |
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MIN |
TYP |
MAX |
UNITS |
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VIH |
High Level Input Voltage |
VCC = 3.6V |
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1.9 |
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V |
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VIL |
Low Level Input Voltage |
VCC = 2.65V |
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0.45 |
V |
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IIH |
High Level Input Current |
VIN = VCC |
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2.5 |
mA |
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IIL |
Low Level Input Current |
VIN = 0V |
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– 2.5 |
mA |
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VOH |
High Level Output Voltage |
VCC = 2.65V, IO = 10mA |
● |
2.4 |
2.64 |
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V |
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IO = 360mA |
● |
2.1 |
2.50 |
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V |
VOL |
Low Level Output Voltage |
VCC = 2.65V, IO = 400mA |
● |
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0.3 |
V |
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IOZ |
Hi-Z Output Leakage |
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±3 |
mA |
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CS |
=High |
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● |
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ISOURCE |
Output Source Current |
VOUT = 0V |
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– 10 |
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mA |
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ISINK |
Output Sink Current |
VOUT = VCC |
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15 |
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mA |
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IREF |
Reference Current |
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0.001 |
2.5 |
mA |
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CS |
= VCC |
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● |
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tCYC ³ 200ms, fCLK £ 50kHz |
● |
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3.500 |
7.5 |
mA |
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tCYC = 58ms, fCLK = 250kHz |
● |
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35.00 |
50.0 |
mA |
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ICC |
Supply Current |
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0.001 |
± 3 |
mA |
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CS |
= VCC |
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● |
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LTC1096L, |
tCYC ³ 200ms, fCLK £ 50kHz |
● |
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40 |
80 |
mA |
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tCYC = 58ms, fCLK = 250kHz |
● |
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120 |
180 |
mA |
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LTC1098L, |
tCYC ³ 200ms, fCLK £ 50kHz |
● |
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44 |
88 |
mA |
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tCYC = 58ms, fCLK = 250kHz |
● |
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155 |
230 |
mA |
3
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