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LTC2448IUHF#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
LTC2444/LTC2445/
LTC2448/LTC2449
4
2444589fc
For more information www.linear.com/LTC2444
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IN
+
Absolute/Common Mode IN
+
Voltage
l
GND – 0.3V V
CC
+ 0.3V V
IN
–
Absolute/Common Mode IN
–
Voltage
l
GND – 0.3V V
CC
+ 0.3V V
V
IN
Input Differential Voltage Range
(IN
+
– IN
–
)
l
–V
REF
/2 V
REF
/2 V
REF
+
Absolute/Common Mode REF
+
Voltage
l
0.1 V
CC
V
REF
–
Absolute/Common Mode REF
–
Voltage
l
GND V
CC
– 0.1V V
V
REF
Reference Differential Voltage Range
(REF
+
– REF
–
)
l
0.1 V
CC
V
C
S(IN
+
)
IN
+
Sampling Capacitance 2 pF
C
S(IN
–
)
IN
–
Sampling Capacitance 2 pF
C
S(REF
+
)
REF
+
Sampling Capacitance 2 pF
C
S(REF
–
)
REF
–
Sampling Capacitance 2 pF
I
DC_LEAK(IN
+
, IN
–
,
REF
+
, REF
–
)
Leakage Current, Inputs and Reference CS = V
CC
, IN
+
= GND, IN
–
= GND,
REF
+
= 5V, REF
–
= GND
l
–15 1 15 nA
I
SAMPLE(IN
+
, IN
–
,
REF
+
, REF
–
)
Average Input/Reference Current
During Sampling
Varies, See Applications Section nA
t
OPEN
MUX Break-Before-Make 50 ns
QIRR MUX Off Isolation V
IN
= 2V
P-P
DC to 1.8MHz 120 dB
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
High Level Input Voltage, CS, F
O
, SDI 4.5V ≤ V
CC
≤ 5.5V
l
2.5 V
V
IL
Low Level Input Voltage, CS, F
O
, SDI 4.5V ≤ V
CC
≤ 5.5V
l
0.8 V
V
IH
High Level Input Voltage SCK 4.5V ≤ V
CC
≤ 5.5V (Note 8)
l
2.5 V
V
IL
Low Level Input Voltage SCK 4.5V ≤ V
CC
≤ 5.5V (Note 8)
l
0.8 V
I
IN
Digital Input Current, CS, F
O
, EXT, SDI 0V ≤ V
IN
≤ V
CC
l
–10 10 µA
I
IN
Digital Input Current, SCK 0V ≤ V
IN
≤ V
CC
(Note 8)
l
–10 10 µA
C
IN
Digital Input Capacitance, CS, F
O
, SDI 10 pF
C
IN
Digital Input Capacitance, SCK (Note 8) 10 pF
V
OH
High Level Output Voltage, SDO, BUSY I
O
= –800µA
l
V
CC
– 0.5V V
V
OL
Low Level Output Voltage, SDO, BUSY I
O
= 1.6mA
l
0.4V V
V
OH
High Level Output Voltage, SCK I
O
= –800µA (Note 9)
l
V
CC
– 0.5V V
V
OL
Low Level Output Voltage, SCK I
O
= 1.6mA (Note 9)
l
0.4V V
I
OZ
Hi-Z Output Leakage, SDO
l
–10 10 µA
analog inpuT anD reFerence
DigiTal inpuTs anD DigiTal ouTpuTs
The l denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
The l denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage
l
4.5 5.5 V
I
CC
Supply Current
Conversion Mode
Sleep Mode
CS = 0V (Note 7)
CS = V
CC
(Note 7)
l
l
8
8
11
30
mA
µA
power requireMenTs
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 3)
LTC2444/LTC2445/
LTC2448/LTC2449
5
2444589fc
For more information www.linear.com/LTC2444
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All voltage values are with respect to GND.
Note 3: V
CC
= 4.5V to 5.5V unless otherwise specified.
V
REF
= REF
+
– REF
–
, V
REFCM
= (REF
+
+ REF
–
)/2;
V
IN
= IN
+
– IN
–
, V
INCM
= (IN
+
+ IN
–
)/2.
Note 4: F
O
pin tied to GND or to external conversion clock source with
f
EOSC
= 10MHz unless otherwise specified.
Note 5: Guaranteed by design, not subject to test.
Note 6: Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
EOSC
External Oscillator Frequency Range
l
0.1 12 MHz
t
HEO
External Oscillator High Period
l
25 10000 ns
t
LEO
External Oscillator Low Period
l
25 10000 ns
t
CONV
Conversion Time OSR = 256 (SDI = 0)
OSR = 32768 (SDI = 1)
External Oscillator, 1X Mode
(Notes 10, 13)
l
l
l
0.99
126
1.13
145
1.33
170
ms
ms
ms
f
ISCK
Internal SCK Frequency Internal Oscillator (Note 9)
External Oscillator (Notes 9, 10)
l
0.8 0.9
f
EOSC
/10
1 MHz
Hz
D
ISCK
Internal SCK Duty Cycle (Note 9)
l
45 55 %
f
ESCK
External SCK Frequency Range (Note 8)
l
20 MHz
t
LESCK
External SCK Low Period (Note 8)
l
25 ns
t
HESCK
External SCK High Period (Note 8)
l
25 ns
t
DOUT_ISCK
Internal SCK 32-Bit Data Output Time Internal Oscillator (Notes 9, 11)
External Oscillator (Notes 9, 10)
l
l
41.6 35.3
320/f
EOSC
30.9 µs
s
t
DOUT_ESCK
External SCK 32-Bit Data Output Time (Note 8)
l
32/f
EOSC
s
t
1
CS ↓ to SDO Low Z
(Note 12)
l
0 25 ns
t
2
CS ↑ to SDO High Z
(Note 12)
l
0 25 ns
t
3
CS ↓ to SCK ↓
(Note 9) 5 µs
t
4
CS ↓ to SCK ↑
(Notes 8, 12)
l
25 ns
t
KQMAX
SCK ↓ to SDO Valid
l
25 ns
t
KQMIN
SDO Hold After SCK ↓
(Note 5)
l
15 ns
t
5
SCK Set-Up Before CS ↓
l
50 ns
t
6
SCK Hold After CS ↓
l
50 ns
t
7
SDI Set-Up Before SCK ↑
(Note 5)
l
10 ns
t
8
SDI Hold After SCK ↑
(Note 5)
l
10 ns
TiMing characTerisTics
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 3)
Note 7: The converter uses the internal oscillator.
Note 8: The converter is in external SCK mode of operation such that the
SCK pin is used as a digital input. The frequency of the clock signal driving
SCK during the data output is f
ESCK
and is expressed in Hz.
Note 9: The converter is in internal SCK mode of operation such that the
SCK pin is used as a digital output. In this mode of operation, the SCK pin
has a total equivalent load capacitance of C
LOAD
= 20pF.
Note 10: The external oscillator is connected to the F
O
pin. The external
oscillator frequency, f
EOSC
, is expressed in Hz.
Note 11: The converter uses the internal oscillator. F
O
= 0V.
Note 12: Guaranteed by design and test correlation.
Note 13: There is an internal reset that adds an additional 5 to 15 f
O
cycles
to the conversion time.
40 • OSR +178
f
EOSC
(kHz)
LTC2444/LTC2445/
LTC2448/LTC2449
6
2444589fc
For more information www.linear.com/LTC2444
pin FuncTions
GND (Pins 1, 4, 5, 6, 31, 32, 33): Ground. Multiple ground
pins internally connected for optimum ground current flow
and V
CC
decoupling. Connect each one of these pins to
a common ground plane through a low impedance con-
nection. All seven pins must be connected to ground for
proper operation.
BUSY (Pin 2): Conversion in Progress Indicator. This pin
is HIGH while the conversion is in progress and goes LOW
indicating the conversion is complete and data is ready.
It remains LOW during the sleep and data output states.
At the conclusion of the data output state, it goes HIGH
indicating a new conversion has begun.
EXT (Pin 3): Internal/External SCK Selection Pin. This
pin is used to select internal or external SCK for output
-
ting/inputting data. If EXT is tied low, the device is in the
external SCK mode and data is shifted out of the device
under the control of a user applied serial clock. If EXT is
tied high, the internal serial clock mode is selected. The
device generates its own SCK signal and outputs this on
the SCK pin. A framing signal BUSY (Pin 2) goes low
indicating data is being output.
COM (Pin 7):
The common negative input (IN
–
) for all
single ended multiplexer configurations. The voltage on
CH0 to CH15 and COM pins can have any value between
GND – 0.3V to V
CC
+ 0.3V. Within these limits, the two
selected inputs (IN
+
and IN
–
) provide a bipolar input range
(V
IN
= IN
+
– IN
–
) from –0.5 • V
REF
to 0.5 • V
REF
. Outside
this input range, the converter produces unique overrange
and underrange output codes.
CH0 to CH15 (Pins 8 to 23): LTC2448/LTC2449 Analog
Inputs. May be programmed for single-ended or differ
-
ential mode.
C
H0 to CH7
(Pins 9, 10, 13, 14, 17, 18, 21, 22): LTC2444/
LTC2445 Analog Inputs. May be programmed for single-
ended or differential mode.
NC (Pins 8, 11, 12, 15, 16, 19, 20, 23): LTC2444/LTC2445
No Connect/Channel Isolation Shield. May be left floating
or tied to any voltage 0 to V
CC
in order to provide isolation
for pairs of differential input channels.
NC (Pins 24, 25, 26, 27): LTC2444/LTC2448 No Connect.
These pins can either be tied to ground or left floating.
MUXOUTP (Pin 24): LTC2445/LTC2449 Positive Mul
-
tiplexer Output. Used to drive the input to an external
buffer/amplifier.
ADCINP (Pin 25): LTC2445/LTC2449 Positive ADC Input.
Tie to output of buffer/amplifier driven by MUXOUTP.
ADCINN (Pin 26): LTC2445/LTC2449 Negative ADC Input.
Tie to output of buffer/amplifier driven by MUXOUTN.
MUXOUTN (Pin 27): LTC2445/LTC2449 Negative Mul
-
tiplexer Output. Used to drive the input to an external
buffer/amplifier.
V
CC
(Pin 28): Positive Supply Voltage. Bypass to GND with
a 10µF tantalum capacitor in parallel with a 0.1µF ceramic
capacitor as close to the part as possible.
REF
+
(Pin 29), REF
–
(Pin 30): Differential Reference Input.
The voltage on these pins can have any value between
GND and V
CC
as long as the reference positive input, REF
+
,
is maintained more positive than the negative reference
input, REF
+
, by at least 0.1V.
SDI (Pin 34): Serial Data Input. This pin is used to select
the speed, 1X or 2X mode, resolution, and input channel,
for the next conversion cycle. At initial power up, the
default mode of operation is CH0 to CH1, OSR of 256,
and 1X mode. The serial data input contains an enable
bit which determines if a new channel/speed is selected.
If this bit is low the following conversion remains at the
same speed and selected channel. The serial data input
is applied to the device under control of the serial clock
(SCK) during the data output cycle. The first conversion
following a new channel/speed is valid.
F
O
(Pin 35): Frequency Control Pin. Digital input that con-
trols the internal conversion clock. When F
O
is connected
to V
CC
or GND, the converter uses its internal oscillator.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30

LTC2448IUHF#TRPBF

Mfr. #:
Buy LTC2448IUHF#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 24-Bit 8-ch. Diff., High Speed Delta-Sigma ADC
Lifecycle:
New from this manufacturer.
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