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Datasheet LTC2377-18 PDF ( 特性, スペック, ピン接続図 )

部品番号 LTC2377-18
部品説明 Low Power SAR ADC
メーカ Linear
ロゴ Linear ロゴ 
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LTC2377-18 Datasheet, LTC2377-18 PDF,ピン配置, 機能
FEATURES
n 500ksps Throughput Rate
n ±1.75LSB INL (Max)
n Guaranteed 18-Bit No Missing Codes
n Low Power: 6.8mW at 500ksps, 6.8μW at 500sps
n 102dB SNR (Typ) at fIN = 2kHz
n 124dB THD (Typ) at fIN = 2kHz
n Digital Gain Compression (DGC)
n Guaranteed Operation to 125°C
n 2.5V Supply
n Fully Differential Input Range ±VREF
n VREF Input Range from 2.5V to 5.1V
n No Pipeline Delay, No Cycle Latency
n 1.8V to 5V I/O Voltages
n SPI-Compatible Serial I/O with Daisy-Chain Mode
n Internal Conversion Clock
n 16-Lead MSOP and 4mm × 3mm DFN Packages
APPLICATIONS
n Medical Imaging
n High Speed Data Acquisition
n Portable or Compact Instrumentation
n Industrial Process Control
n Low Power Battery-Operated Instrumentation
n ATE
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
LTC2377-18
18-Bit, 500ksps, Low Power
SAR ADC with 102dB SNR
DESCRIPTION
The LTC®2377-18 is a low noise, low power, high speed
18-bit successive approximation register (SAR) ADC.
Operating from a 2.5V supply, the LTC2377-18 has a
±VREF fully differential input range with VREF ranging from
2.5V to 5.1V. The LTC2377-18 consumes only 6.8mW and
achieves ±1.75LSB INL maximum, no missing codes at
18 bits with 102dB SNR.
The LTC2377-18 has a high speed SPI-compatible se-
rial interface that supports 1.8V, 2.5V, 3.3V and 5V logic
while also featuring a daisy-chain mode. The fast 500ksps
throughput with no cycle latency makes the LTC2377-18
ideally suited for a wide variety of high speed applications.
An internal oscillator sets the conversion time, easing exter-
nal timing considerations. The LTC2377-18 automatically
powers down between conversions, leading to reduced
power dissipation that scales with the sampling rate.
The LTC2377-18 features a unique digital gain compres-
sion (DGC) function, which eliminates the driver amplifier’s
negative supply while preserving the full resolution of the
ADC. When enabled, the ADC performs a digital scaling
function that maps zero-scale code from 0V to 0.1 • VREF
and full-scale code from VREF to 0.9 • VREF. For a typical
reference voltage of 5V, the full-scale input range is now
0.5V to 4.5V, which provides adequate headroom for
powering the driving amplifier from a single 5.5V supply.
TYPICAL APPLICATION
2.5V 1.8V TO 5V
10μF
0.1μF
VREF
0V
VREF
0V
+
20Ω
6800pF
VDD OVDD CHAIN
IN+ RDL/SDI
SDO
3300pF
LTC2377-18
SCK
20Ω
IN
6800pF
REF
BUSY
CNV
GND REF/DGC
2.5V TO 5.1V
237718 TA01
47μF
(X5R, 0805 SIZE)
SAMPLE CLOCK
VREF
32k Point FFT fS = 500ksps, fIN = 2kHz
0
SNR = 102.3dB
–20 THD = –124dB
SINAD = 102.2dB
–40 SFDR = 125dB
–60
–80
–100
–120
–140
–160
–180
0
50 100 150 200 250
FREQUENCY (kHz)
237718 TA02
237718f
1

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LTC2377-18 pdf, ピン配列
LTC2377-18
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP
MAX UNITS
VIN+ Absolute Input Range (IN+)
VIN– Absolute Input Range (IN)
(Note 5)
(Note 5)
l –0.05
l –0.05
VREF + 0.05
VREF + 0.05
V
V
VIN+ – VIN– Input Differential Voltage Range
VIN = VIN+ – VIN
l –VREF
+VREF
V
VCM Common-Mode Input Range
l VREF/2– VREF/2
0.1
VREF/2+
0.1
V
IIN Analog Input Leakage Current
l ±1 μA
CIN Analog Input Capacitance
Sample Mode
Hold Mode
45 pF
5 pF
CMRR
Input Common Mode Rejection Ratio
fIN = 250kHz
86 dB
CONVERTER CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Resolution
l 18
Bits
No Missing Codes
l 18
Bits
Transition Noise
INL Integral Linearity Error
(Note 6)
l –1.75
0.7
±0.5
LSBRMS
1.75 LSB
DNL Differential Linearity Error
l –0.5 ±0.1
0.5
LSB
BZE Bipolar Zero-Scale Error
(Note 7)
l –8
0
8
LSB
Bipolar Zero-Scale Error Drift
3 mLSB/°C
FSE Bipolar Full-Scale Error
(Note 7)
l –40
±7
40
LSB
Bipolar Full-Scale Error Drift
±0.05
ppm/°C
DYNAMIC ACCURACY The l denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C and AIN = –1dBFS. (Notes 4, 8)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
SINAD Signal-to-(Noise + Distortion) Ratio
SNR Signal-to-Noise Ratio
THD Total Harmonic Distortion
SFDR
Spurious Free Dynamic Range
–3dB Input Bandwidth
Aperture Delay
Aperture Jitter
Transient Response
fIN = 2kHz, VREF = 5V
l 98.5
fIN = 2kHz, VREF = 5V, (H-Grade)
l 98
fIN
fIN
=
=
2kHz,
2kHz,
VREF
VREF
=
=
5V
5V,
REF/DGC
=
GND
fIN = 2kHz, VREF = 2.5V
l 99.3
l 97.5
l 94.1
fIN
fIN
=
=
2kHz,
2kHz,
VREF
VREF
=
=
5V,
5V,
(H-Grade)
REF/DGC =
GND,
(H-Grade)
l
l
98.8
97.1
fIN = 2kHz, VREF = 2.5V, (H-Grade)
l 93.5
fIN
fIN
=
=
2kHz,
2kHz,
VREF
VREF
=
=
5V
5V,
REF/DGC
=
GND
fIN = 2kHz, VREF = 2.5V
l
l
l
fIN
fIN
=
=
2kHz,
2kHz,
VREF
VREF
=
=
5V,
5V,
(H-Grade)
REF/DGC =
GND,
(H-Grade)
fIN = 2kHz, VREF = 2.5V, (H-Grade)
l
l
l
fIN = 2kHz, VREF = 5V
l 105
Full-Scale Step
102
102
102
100
97
102
100
97
–124
–126
–123
–124
–126
–123
125
34
500
4
1.460
–106
–103
–105
–104
–100
–104
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
MHz
ps
ps
μs
237718f
3


3Pages


LTC2377-18 電子部品, 半導体
LTC2377-18
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, VDD = 2.5V, OVDD = 2.5V, VCM = 2.5V,
REF = 5V, fSMPL = 500ksps, unless otherwise noted.
Integral Nonlinearity
vs Output Code
1.5
1.0
0.5
0.0
–0.5
–1.0
–1.5
0
65536 131072 196608 262144
OUTPUT CODE
237718 G01
Differential Nonlinearity
vs Output Code
0.5
0.4
0.3
0.2
0.1
0.0
–0.1
–0.2
–0.3
–0.4
–0.5
0
65536 131072 196608 262144
OUTPUT CODE
237718 G02
DC Histogram
80000
70000
σ = 0.7
60000
50000
40000
30000
20000
10000
0
131069 131070 131071 131072 131073 131074
CODE
237718 G03
32k Point FFT fS = 500ksps,
fIN = 2kHz
0
SNR = 102.3dB
–20 THD = –124dB
SINAD = 102.2dB
–40 SFDR = 125dB
–60
–80
–100
–120
–140
–160
–180
0
50 100 150 200 250
FREQUENCY (kHz)
237718 G04
SNR, SINAD vs Input Frequency
103
102 SNR
101
100 SINAD
99
98
97
96
95
94
93
0 25 50 75 100 125 150 175 200
FREQUENCY (kHz)
237718 G05
THD, Harmonics
vs Input Frequency
–80
THD
2ND
–90 3RD
–100
–110
–120
–130
–140
0
25 50 75 100 125 150 175 200
FREQUENCY (kHz)
237718 G06
SNR, SINAD vs Input level,
fIN = 2kHz
103.0
102.5
102.0
SNR
SINAD
101.5
101.0
–40
–30 –20 –10
0
INPUT LEVEL (dB)
237718 G07
SNR, SINAD vs Reference
Voltage, fIN = 2kHz
103
102
101
SNR
100 SINAD
99
98
97
2.5
3.0 3.5 4.0 4.5 5.0
REFERENCE VOLTAGE (V)
237718 G08
THD, Harmonics vs Reference
Voltage, fIN = 2kHz
–100
–105
–110
–115
–120
–125
–130
–135
THD
3RD
2ND
–140
–145
–150
2.5
3.0 3.5 4.0 4.5 5.0
REFERENCE VOLTAGE (V)
237718 G09
237718f
6

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