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LTC1850IFW#TRPBF

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1
LTC1850/LTC1851
18501f
8-Channel, 10-Bit/12-Bit,
1.25Msps Sampling ADCs
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.
■
Flexible 8-Channel Multiplexer
■
Single-Ended or Differential Inputs
■
Two Gain Ranges Plus Unipolar and Bipolar
Operation
■
1.25Msps Sampling Rate
■
Single 5V Supply and 40mW Power Dissipation
■
Scan Mode and Programmable Sequencer
■
Pin Compatible 10-Bit LTC1850 and 12-Bit LTC1851
■
True Differential Inputs Reject Common Mode Noise
■
Internal 2.5V Reference
■
Parallel Output Includes MUX Address
■
Easy Interface to 3V Logic
■
Nap and Sleep Shutdown Modes
■
High Speed Data Acquisition
■
Test and Measurement
■
Imaging Systems
■
Telecommunications
■
Industrial Process Control
■
Spectrum Analysis
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
BLOCK DIAGRA
W
BUSY
DIFF
OUT
/S6
A2
OUT
/S5
A1
OUT
/S4
A0
OUT
/S3
D11/S2
D10/S1
D9/S0
D8
D7
D6
D5
D4
D3
D2
D1
D0
M1
SHDN
CS
CONVST
RD
WR
DIFF
A2
A1
A0
UNI/BIP
PGA
M0
OUTPUT
DRIVERS
DATA
LATCHES
OGND
1851 BD
OV
DD
REF AMP
REFCOMP
REFIN
REFOUT
COM
CH7
CH6
CH5
CH4
CH3
CH2
CH1
CH0
8-CHANNEL
MULTIPLEXER
2.5V
REFERENCE
INTERNAL
CLOCK
LTC1851
CONTROL LOGIC
AND
PROGRAMMABLE
SEQUENCER
12-BIT
1.25Msps ADC
, LTC and LT are registered trademarks of Linear Technology Corporation.
CODE
0
–1.00
INL COC ERROR (LSBs)
–0.50
0.00
0.50
1.00
512 1024 1536 2048
LTC1850/51 G01
2560 3072 3584 4096
Integral Linearity, LTC1851
2
LTC1850/LTC1851
18501f
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
Supply Voltage (V
DD
)................................................. 6V
Analog Input Voltage (Note 3) ..... –0.3V to (V
DD
+ 0.3V)
Digital Input Voltage (Note 4) ....................–0.3V to 10V
Digital Output Voltage..................–0.3V to (V
DD
+ 0.3V)
Power Dissipation.............................................. 500mW
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART
NUMBER
LTC1850CFW
LTC1850IFW
T
JMAX
= 150°C, θ
JA
= 110°C/W
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
TOP VIEW
FW PACKAGE
48-LEAD PLASTIC TSSOP
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
REFOUT
REFIN
REFCOMP
GND
V
DD
V
DD
GND
DIFF
OUT
/S6
A2
OUT
/S5
A1
OUT
/S4
A0
OUT
/S3
D11/S2
D10/S1
D9/S0
D8
M1
SHDN
CS
CONVST
RD
WR
DIFF
A2
A1
A0
UNI/BIP
PGA
M0
OV
DD
OGND
BUSY
D0
D1
D2
D3
D4
D5
D6
D7
OV
DD
= V
DD
(Notes 1, 2)
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
ORDER PART
NUMBER
LTC1851CFW
LTC1851IFW
T
JMAX
= 150°C, θ
JA
= 110°C/W
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
TOP VIEW
FW PACKAGE
48-LEAD PLASTIC TSSOP
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
REFOUT
REFIN
REFCOMP
GND
V
DD
V
DD
GND
DIFF
OUT
/S6
A2
OUT
/S5
A1
OUT
/S4
A0
OUT
/S3
D9/S2
D8/S1
D7/S0
D6
M1
SHDN
CS
CONVST
RD
WR
DIFF
A2
A1
A0
UNI/BIP
PGA
M0
OV
DD
OGND
BUSY
NC
NC
D0
D1
D2
D3
D4
D5
Consult LTC Marketing for parts specified with wider operating temperature ranges.
3
LTC1850/LTC1851
18501f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Analog Input Range (Note 9) 4.75V ≤ V
DD
≤ 5.25V
Unipolar, Gain = 1 (PGA = 1) 0 – REFCOMP V
Unipolar, Gain = 2 (PGA = 0) 0 – REFCOMP/2 V
Bipolar, Gain = 1 (PGA = 1) ±REFCOMP/2 V
Bipolar, Gain = 2 (PGA = 0) ±REFCOMP/4 V
I
IN
Analog Input Leakage Current V
IN
> 0V < V
DD
, All Channels ● ±1 µA
C
IN
Analog Input Capacitance Between Conversions (Gain = 1) 15 pF
Between Conversions (Gain = 2) 25 pF
During Conversions 5 pF
t
ACQ
Sample-and-Hold Acquisition Time ● 50 150 ns
t
S(MUX)
Multiplexer Settling Time (Includes t
ACQ
) ● 50 150 ns
t
AP
Sample-and-Hold Aperture Delay Time –0.5 ns
t
jitter
Sample-and-Hold Aperture Delay Time Jitter 2 ps
RMS
CMRR Analog Input Common Mode Rejection Ratio 0V < (A
IN
–
= A
IN
+
) < 5V 60 dB
The ● denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 5)
A ALOG I PUT
UU
LTC1850 LTC1851
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Resolution (No Missing Codes) ● 10 12 Bits
Integral Linearity Error (Note 7) ● ±0.25 ±0.5 ±0.35 ±1LSB
Differential Linearity Error ● ±0.25 ±0.5 ±0.25 ±1LSB
Offset Error (Bipolar and Unipolar) (Note 8)
Gain = 1 (PGA = 1) REFCOMP ≥ 2V ±2 ±5LSB
Gain = 1 (PGA = 1) REFCOMP ≥ 2V ● ±0.5 ±2 ±1 ±7LSB
Gain = 2 (PGA = 0)
● ±1 ±4 ±2 ±10 LSB
Offset Error Match ±0.5 ±1LSB
Unipolar Gain Error With External 4.096V Reference
Gain = 1 (PGA = 1) Applied to REFCOMP (Note 12) ±2 ±6LSB
Gain = 2 (PGA = 0) ±4 ±10 LSB
Unipolar Gain Error Match ±0.5 ±1LSB
Bipolar Gain Error With External 4.096V Reference
Gain = 1 (PGA = 1) Applied to REFCOMP (Note 12) ±2 ±6LSB
Gain = 2 (PGA = 0) ±4 ±10 LSB
Bipolar Gain Error Match ±0.5 ±1LSB
Full-Scale Error Temperature Coefficient 15 15 ppm/°C
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 5, 6)
CO VERTER CHARACTERISTICS
U
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LTC1850IFW#TRPBF

Mfr. #:
Buy LTC1850IFW#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 10-bit, 8-ch. Parallel 1.25Msps ADC
Lifecycle:
New from this manufacturer.
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