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Linear Technology Electronic Components Datasheet

LTC1851 Datasheet

1.25Msps Sampling ADCs

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LTC1851 pdf
FEATURES
s Flexible 8-Channel Multiplexer
s Single-Ended or Differential Inputs
s Two Gain Ranges Plus Unipolar and Bipolar
Operation
s 1.25Msps Sampling Rate
s Single 5V Supply and 40mW Power Dissipation
s Scan Mode and Programmable Sequencer
wwws.DaPtianSCheoemt4pUa.ctiobmle 10-Bit LTC1850 and 12-Bit LTC1851
s True Differential Inputs Reject Common Mode Noise
s Internal 2.5V Reference
s Parallel Output Includes MUX Address
s Easy Interface to 3V Logic
s Nap and Sleep Shutdown Modes
U
APPLICATIO S
s High Speed Data Acquisition
s Test and Measurement
s Imaging Systems
s Telecommunications
s Industrial Process Control
s Spectrum Analysis
LTC1850/LTC1851
8-Channel, 10-Bit/12-Bit,
1.25Msps Sampling ADCs
DESCRIPTIO
The 10-bit LTC®1850 and 12-bit LTC1851 are complete
8-channel data acquisition systems. They include a flex-
ible 8-channel multiplexer, a 1.25Msps successive approxi-
mation analog-to-digital converter with sample-and-hold,
an internal 2.5V reference and reference buffer amplifier,
and a parallel output interface. The multiplexer can be con-
figured for single-ended or differential inputs, two gain
ranges and unipolar or bipolar operation.
The ADCs have a scan mode that will repeatedly cycle
through all 8 multiplexer channels and can also be
programmed with a sequence of up to 16 addresses and
configurations that can be scanned in succession. The
sequence memory can also be read back. The reference
and buffer amplifier provide pin strappable ranges of
4.096V, 2.5V and 2.048V. The parallel output includes
the 10-bit or 12-bit conversion result plus the 4-bit
multiplexer address. The digital outputs are powered
from a separate supply allowing for easy interface to 3V
digital logic. Typical power consumption is 40mW at
1.25Msps from a single 5V supply.
, LTC and LT are registered trademarks of Linear Technology Corporation.
BLOCK DIAGRA
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
REFOUT
8-CHANNEL
MULTIPLEXER
2.5V
REFERENCE
REFIN
REFCOMP
REF AMP
LTC1851
INTERNAL
CLOCK
12-BIT
1.25Msps ADC
CONTROL LOGIC
AND
PROGRAMMABLE
SEQUENCER
DATA
LATCHES
OUTPUT
DRIVERS
M1
SHDN
CS
CONVST
RD
WR
DIFF
A2
A1
A0
UNI/BIP
PGA
M0
OVDD
BUSY
DIFFOUT/S6
A2OUT/S5
A1OUT/S4
A0OUT/S3
D11/S2
D10/S1
D9/S0
D8
D7
D6
D5
D4
D3
D2
D1
D0
OGND
1851 BD
Integral Linearity, LTC1851
1.00
0.50
0.00
–0.50
–1.00
0 512 1024 1536 2048 2560 3072 3584 4096
CODE
LTC1850/51 G01
18501f
1


Linear Technology Electronic Components Datasheet

LTC1851 Datasheet

1.25Msps Sampling ADCs

No Preview Available !

LTC1851 pdf
LTC1850/LTC1851
ABSOLUTE AXI U RATI GS OVDD = VDD (Notes 1, 2)
Supply Voltage (VDD) ................................................. 6V
Analog Input Voltage (Note 3) ..... – 0.3V to (VDD + 0.3V)
Digital Input Voltage (Note 4) ....................– 0.3V to 10V
Digital Output Voltage .................. – 0.3V to (VDD + 0.3V)
Power Dissipation .............................................. 500mW
Ambient Operating Temperature Range
LTC1850C/LTC1851C ............................ 0°C to 70°C
LTC1850I/LTC1851I .......................... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
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CH0 1
CH1 2
CH2 3
CH3 4
CH4 5
CH5 6
CH6 7
CH7 8
COM 9
REFOUT 10
REFIN 11
REFCOMP 12
GND 13
VDD 14
VDD 15
GND 16
DIFFOUT/S6 17
A2OUT/S5 18
A1OUT/S4 19
A0OUT/S3 20
D9/S2 21
D8/S1 22
D7/S0 23
D6 24
48 M1
47 SHDN
46 CS
45 CONVST
44 RD
43 WR
42 DIFF
41 A2
40 A1
39 A0
38 UNI/BIP
37 PGA
36 M0
35 OVDD
34 OGND
33 BUSY
32 NC
31 NC
30 D0
29 D1
28 D2
27 D3
26 D4
25 D5
FW PACKAGE
48-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 110°C/W
ORDER PART
NUMBER
LTC1850CFW
LTC1850IFW
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
CH0 1
CH1 2
CH2 3
CH3 4
CH4 5
CH5 6
CH6 7
CH7 8
COM 9
REFOUT 10
REFIN 11
REFCOMP 12
GND 13
VDD 14
VDD 15
GND 16
DIFFOUT/S6 17
A2OUT/S5 18
A1OUT/S4 19
A0OUT/S3 20
D11/S2 21
D10/S1 22
D9/S0 23
D8 24
48 M1
47 SHDN
46 CS
45 CONVST
44 RD
43 WR
42 DIFF
41 A2
40 A1
39 A0
38 UNI/BIP
37 PGA
36 M0
35 OVDD
34 OGND
33 BUSY
32 D0
31 D1
30 D2
29 D3
28 D4
27 D5
26 D6
25 D7
FW PACKAGE
48-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 110°C/W
ORDER PART
NUMBER
LTC1851CFW
LTC1851IFW
18501f
2


Part Number LTC1851
Description 1.25Msps Sampling ADCs
Maker Linear Technology
Total Page 28 Pages
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