LTC2439-1.pdf 데이터시트 (총 28 페이지) - 파일 다운로드 LTC2439-1 데이타시트 다운로드

No Preview Available !

www.DataSheet4U.com
LTC2439-1
8-/16-Channel
16-Bit No Latency ∆ΣTM ADC
FEATURES
s 16-Channel Single-Ended or 8-Channel Differential
Inputs
s Low Supply Current (200µA, 4µA in Autosleep)
s Rail-to-Rail Differential Input/Reference
s 16-Bit No Missing Codes
s 1µV RMS Noise, 16-ENOBS Independent of VREF
s Very Low Transition Noise: Less Than 0.02LSB
s Operates with a Reference as Low as 100mV with
1.5µV LSB Step Size
s Guaranteed Modulator Stability and Lock-Up
Immunity for Any Input and Reference Conditions
s Single Supply 2.7V to 5.5V Operation
s Internal Oscillator—No External Components
Required
s 87dB Min, 50Hz and 60Hz Simultaneous Notch Filter
s Pin Compatible with the 24-Bit LTC2418
s 28-Lead SSOP PUackage
APPLICATIO S
s Direct Sensor Digitizer
s Weight Scales
s Direct Temperature Measurement
s Gas Analyzers
s Strain Gauge Transducers
s Instrumentation
s Data Acquisition
s Industrial Process Control
DESCRIPTIO
The LTC®2439-1 is a 16-channel (8-differential)
micropower 16-bit ∆Σ analog-to-digital converter. It op-
erates from 2.7V to 5.5V and includes an integrated
oscillator, 0.12LSB INL and 1µV RMS noise. It uses delta-
sigma technology and provides single cycle settling time
for multiplexed applications. Through a single pin, the
LTC2439-1 can be configured for better than 87dB differ-
ential mode rejection at 50Hz and 60Hz ±2%, or it can be
driven by an external oscillator for a user-defined rejec-
tion frequency. The internal oscillator requires no external
frequency setting components.
The LTC2439-1 accepts any external differential reference
voltage from 0.1V to VCC for flexible ratiometric and remote
sensing measurement applications. It can be configured
to take 8 differential channels or 16 single-ended channels.
The full-scale bipolar input range is from – 0.5VREF to
0.5VREF. The reference common mode voltage, VREFCM, and
the input common mode voltage, VINCM, may be indepen-
dently set between GND and VCC. The DC common mode
input rejection is better than 140dB.
The LTC2439-1 communicates through a flexible
4-wire digital interface that is compatible with SPI and
MICROWIRETM protocols.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No Latency ∆Σ is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
TYPICAL APPLICATIO
THERMOCOUPLE
21 CH0
22 CH1
28 CH7
1 CH8
8 CH15
10 COM
16-CHANNEL
MUX
2.7V TO 5.5V
11 9
REF+ VCC
+ DIFFERENTIAL
16-BIT Σ ADC
1µF
19
FO
20
SDI
SCK 18
17
SDO
16
CS
= EXTERNAL OSCILLATOR
= 50Hz and 60Hz REJECTION
4-WIRE
SPI INTERFACE
12 REF
15 GND
LTC2439-1
241418 TA01a
Minimum Resolvable
Signal vs VREF
90
80
70
60
50
40
30
20
10
0
0 1 2 345
VREF (V)
24361 TA02
*FOR VREF = 0.4V RESOLUTION IS LIMITED BY STEP SIZE
24391f
1

No Preview Available !

LTC2439-1
ABSOLUTE AXI U RATI GS
(Notes 1, 2)
Supply Voltage (VCC) to GND .......................– 0.3V to 7V
Analog Input Voltage to GND ....... – 0.3V to (VCC + 0.3V)
Reference Input Voltage to GND .. – 0.3V to (VCC + 0.3V)
Digital Input Voltage to GND ........ – 0.3V to (VCC + 0.3V)
Digital Output Voltage to GND ..... – 0.3V to (VCC + 0.3V)
Operating Temperature Range
LTC2439-1C ............................................ 0°C to 70°C
LTC2439-1I ........................................ – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
CH8 1
CH9 2
CH10 3
CH11 4
CH12 5
CH13 6
CH14 7
CH15 8
VCC 9
COM 10
REF+ 11
REF12
NC 13
NC 14
28 CH7
27 CH6
26 CH5
25 CH4
24 CH3
23 CH2
22 CH1
21 CH0
20 SDI
19 FO
18 SCK
17 SDO
16 CS
15 GND
GN PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 110°C/W
ORDER PART
NUMBER
LTC2439-1CGN
LTC2439-1IGN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Notes 3, 4)
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Resolution (No Missing Codes) 0.1V VREF VCC, –0.5 • VREF VIN 0.5 • VREF, (Note 5)
q 16
Integral Nonlinearity
4.5V VCC 5.5V, REF+ = 2.5V, REF= GND, VINCM = 1.25V, (Note 6)
5V VCC 5.5V, REF+ = 5V, REF= GND, VINCM = 2.5V, (Note 6)
REF+ = 2.5V, REF= GND, VINCM = 1.25V, (Notes 6, 15)
q
0.06
0.12 1.25
0.30
Offset Error
2.5V REF+ VCC, REF= GND,
GND IN+ = INVCC, (Notes 12,15)
q 5 20
Offset Error Drift
2.5V REF+ VCC, REF= GND,
GND IN+ = INVCC
10
Positive Full-Scale Error
2.5V REF+ VCC, REF= GND,
IN+ = 0.75REF+, IN= 0.25 • REF+ (Note 15)
q 0.16 1.25
Bits
LSB
LSB
LSB
µV
nV/°C
LSB
Positive Full-Scale Error Drift
2.5V REF+ VCC, REF= GND,
IN+ = 0.75REF+, IN= 0.25 • REF+
0.03 ppm of VREF/°C
Negative Full-Scale Error
2.5V REF+ VCC, REF= GND,
IN+ = 0.25 • REF+, IN= 0.75 • REF+ (Note 15)
q 0.16 1.25
LSB
Negative Full-Scale Error Drift 2.5V REF+ VCC, REF= GND,
IN+ = 0.25 • REF+, IN= 0.75 • REF+
0.03 ppm of VREF/°C
Total Unadjusted Error
Output Noise
5V VCC 5.5V, REF+ = 2.5V, REF= GND, VINCM = 1.25V
5V VCC 5.5V, REF+ = 5V, REF= GND, VINCM = 2.5V
REF+ = 2.5V, REF= GND, VINCM = 1.25V, (Note 6)
5V VCC 5.5V, REF+ = 5V, VREF– = GND,
GND IN= IN+ 5V (Note 12)
0.20 LSB
0.20 LSB
0.25 LSB
1 µVRMS
24391f
2

No Preview Available !

LTC2439-1
CO VERTER CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Notes 3, 4)
PARAMETER
Input Common Mode Rejection DC
Input Common Mode Rejection
49Hz to 61.2Hz
Input Normal Mode Rejection
49Hz to 61.2Hz
Reference Common Mode
Rejection DC
Power Supply Rejection, DC
Power Supply Rejection,
Simultaneous 50Hz/60Hz ±2%
CONDITIONS
2.5V REF+ VCC, REF= GND,
GND IN= IN+ VCC (Note 5)
2.5V REF+ VCC, REF= GND,
GND IN= IN+ VCC, (Note 5)
(Note 5)
2.5V REF+ VCC, GND REF2.5V,
VREF = 2.5V, IN= IN+ = GND (Note 5)
REF+ = 2.5V, REF= GND, IN= IN+ = GND
REF+ = 2.5V, REF= GND, IN= IN+ = GND
MIN TYP MAX
q 130 140
q 140
q 87
q 130 140
120
120
UNITS
dB
dB
dB
dB
dB
dB
A ALOG I PUT A D REFERE CE The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
SYMBOL
IN+
IN
VIN
REF+
REF
VREF
CS (IN+)
CS (IN)
CS (REF+)
CS (REF)
IDC_LEAK (IN+)
IDC_LEAK (IN)
IDC_LEAK (REF+)
IDC_LEAK (REF)
PARAMETER
Absolute/Common Mode IN+ Voltage
Absolute/Common Mode INVoltage
Input Differential Voltage Range
(IN+ – IN)
Absolute/Common Mode REF+ Voltage
Absolute/Common Mode REFVoltage
Reference Differential Voltage Range
(REF+ – REF)
IN+ Sampling Capacitance
INSampling Capacitance
REF+ Sampling Capacitance
REFSampling Capacitance
IN+ DC Leakage Current
INDC Leakage Current
REF+ DC Leakage Current
REFDC Leakage Current
Off Channel to On Channel Isolation
(RIN = 100)
tOPEN
IS(OFF)
MUX Break-Before-Make Interval
Channel Off Leakage Current
CONDITIONS
CS = VCC = 5.5V, IN+ = GND
CS = VCC = 5.5V, IN= 5V
CS = VCC = 5.5V, REF+ = 5V
CS = VCC = 5.5V, REF= GND
DC
1Hz
fS = 15,3600Hz
2.7V VCC 5.5V
Channel at VCC and GND
MIN
q GND – 0.3
q GND – 0.3
q – VREF/2
q 0.1
q GND
q 0.1
q –100
q –100
q –100
q –100
q –100
TYP MAX UNITS
VCC + 0.3
VCC + 0.3
VREF/2
V
V
V
VCC
VCC – 0.1
VCC
V
V
V
18
18
18
18
1 100
1 100
1 100
1 100
140
140
140
100
1 100
pF
pF
pF
pF
nA
nA
nA
nA
dB
dB
dB
ns
nA
24391f
3

No Preview Available !

LTC2439-1
DIGITAL I PUTS A D DIGITAL OUTPUTS The q denotes specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIH High Level Input Voltage
CS, FO, SDI
VIL Low Level Input Voltage
CS, FO, SDI
VIH High Level Input Voltage
SCK
VIL Low Level Input Voltage
SCK
IIN Digital Input Current
CS, FO, SDI
IIN Digital Input Current
SCK
2.7V VCC 5.5V
2.7V VCC 3.3V
4.5V VCC 5.5V
2.7V VCC 5.5V
2.7V VCC 5.5V (Note 8)
2.7V VCC 3.3V (Note 8)
4.5V VCC 5.5V (Note 8)
2.7V VCC 5.5V (Note 8)
0V VIN VCC
0V VIN VCC (Note 8)
q 2.5
2.0
q
q 2.5
2.0
q
q –10
q –10
V
V
0.8 V
0.6 V
V
V
0.8 V
0.6 V
10 µA
10 µA
CIN Digital Input Capacitance
CS, FO, SDI
CIN Digital Input Capacitance
SCK
(Note 8)
10 pF
10 pF
VOH High Level Output Voltage
SDO
IO = – 800µA
q VCC – 0.5
V
VOL Low Level Output Voltage
SDO
IO = 1.6mA
q
0.4 V
VOH High Level Output Voltage
SCK
IO = – 800µA (Note 9)
q VCC – 0.5
V
VOL Low Level Output Voltage
SCK
IO = 1.6mA (Note 9)
q
0.4 V
IOZ Hi-Z Output Leakage
SDO
q –10
10 µA
POWER REQUIRE E TS The q denotes specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C. (Note 3)
SYMBOL
VCC
ICC
PARAMETER
Supply Voltage
Supply Current
Conversion Mode
Sleep Mode
Sleep Mode
CONDITIONS
q
CS = 0V (Note 11)
CS = VCC (Note 11)
CS = VCC, 2.7V VCC 3.3V (Note 11, 14)
q
q
MIN
2.7
TYP MAX UNITS
5.5 V
200 300
4 15
2
µA
µA
µA
24391f
4

No Preview Available !

LTC2439-1
WU
TI I G CHARACTERISTICS The q denotes specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 3)
SYMBOL
fEOSC
tHEO
tLEO
tCONV
fISCK
DISCK
fESCK
tLESCK
tHESCK
tDOUT_ISCK
tDOUT_ESCK
t1
t2
t3
t4
tKQMAX
tKQMIN
t5
t6
t7
t8
PARAMETER
CONDITIONS
External Oscillator Frequency Range
External Oscillator High Period
External Oscillator Low Period
Conversion Time
FO = 0V
External Oscillator (Note 10)
Internal SCK Frequency
Internal Oscillator (Note 9)
External Oscillator (Notes 9, 10)
Internal SCK Duty Cycle
(Note 9)
External SCK Frequency Range
(Note 8)
External SCK Low Period
(Note 8)
External SCK High Period
(Note 8)
Internal SCK 19-Bit Data Output Time Internal Oscillator (Notes 9, 11)
External Oscillator (Notes 9, 10)
External SCK 19-Bit Data Output Time (Note 7)
CS to SDO Low
CS to SDO High Z
CS to SCK
(Note 9)
CS to SCK
(Note 8)
SCK to SDO Valid
SDO Hold After SCK
(Note 5)
SCK Set-Up Before CS
SCK Hold After CS
SDI Setup Before SCK
(Note 5)
SDI Hold After SCK
(Note 5)
MIN TYP MAX
q 2.56
2000
q 0.25
390
q 0.25
390
q 143.8
146.7 149.6
q 20510/fEOSC (in kHz)
17.5
fEOSC/8
q 45
55
q 2000
q 250
q 250
q 1.06
1.09 1.11
q 152/fEOSC (in kHz)
q 19/fESCK (in kHz)
q0
200
q0
200
q0
200
q 50
q 220
q 15
q 50
q 50
q 100
q 100
UNITS
kHz
µs
µs
ms
ms
kHz
kHz
%
kHz
ns
ns
ms
ms
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note 1: Absolute Maximum Ratings are those values beyond which the
life of the device may be impaired.
Note 2: All voltage values are with respect to GND.
Note 3: VCC = 2.7V to 5.5V unless otherwise specified.
VREF = REF+ – REF, VREFCM = (REF+ + REF)/2; VIN = IN+ – IN,
VINCM = (IN+ + IN)/2, IN+ and INare defined as the selected positive
and negative input respectively.
Note 4: FO pin tied to GND or to VCC or to external conversion clock
source with fEOSC = 153600Hz 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 precise analog input voltage. Maximum specifications are limited by
the LSB step size (VREF/216) and the single shot measurement. Typical
specifications are measured from the center of the quantization band.
Note 7: FO = GND (internal oscillator) or fEOSC = 139800Hz ±2%
(external oscillator).
Note 8: The converter is in external SCK mode of operation such that
the SCK pin is used as digital input. The frequency of the clock signal
driving SCK during the data output is fESCK and is expressed in kHz.
Note 9: The converter is in internal SCK mode of operation such that
the SCK pin is used as digital output. In this mode of operation the
SCK pin has a total equivalent load capacitance CLOAD = 20pF.
Note 10: The external oscillator is connected to the FO pin. The external
oscillator frequency, fEOSC, is expressed in kHz.
Note 11: The converter uses the internal oscillator.
FO = 0V or FO = VCC.
Note 12: 1µV RMS noise is independent of VREF. Since the noise
performance is limited by the quantization, lowering VREF improves the
effective resolution.
Note 13: Guaranteed by design and test correlation.
Note 14: The low sleep mode current is valid only when CS is high.
Note 15: These parameters are guaranteed by design over the full
supply and temperature range. Automated testing proceedures are
limited by the LSB Step Size (VREF/216).
24391f
5