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Datasheet LTC2377-20 PDF ( 特性, スペック, ピン接続図 )

部品番号 LTC2377-20
部品説明 Low Power SAR ADC
メーカ Linear Technology
ロゴ Linear Technology ロゴ 
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Total 30 pages
		
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LTC2377-20 Datasheet, LTC2377-20 PDF,ピン配置, 機能
FEATURES
nn 500ksps Throughput Rate
nn ±0.5ppm INL (Typ)
nn Guaranteed 20-Bit No Missing Codes
nn Low Power: 10.5mW at 500ksps, 10.5µW at 500sps
nn 104dB SNR (Typ) at fIN = 2kHz
nn –125dB THD (Typ) at fIN = 2kHz
nn Digital Gain Compression (DGC)
nn Guaranteed Operation to 85°C
nn 2.5V Supply
nn Fully Differential Input Range ±VREF
nn VREF Input Range from 2.5V to 5.1V
nn No Pipeline Delay, No Cycle Latency
nn 1.8V to 5V I/O Voltages
nn SPI-Compatible Serial I/O with Daisy-Chain Mode
nn Internal Conversion Clock
nn 16-Lead MSOP and 4mm × 3mm DFN Packages
APPLICATIONS
nn Medical Imaging
nn High Speed Data Acquisition
nn Portable or Compact Instrumentation
nn Industrial Process Control
nn Low Power Battery-Operated Instrumentation
nn 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. Patents Pending. Protected by U.S. Patents, including
7705765, 7961132, 8319673.
LTC2377-20
20-Bit, 500ksps, Low Power
SAR ADC with 0.5ppm INL
DESCRIPTION
The LTC®2377-20 is a low noise, low power, high speed
20-bit successive approximation register (SAR) ADC. Op-
erating from a 2.5V supply, the LTC2377-20 has a ±VREF
fully differential input range with VREF ranging from 2.5V
to 5.1V. The LTC2377-20 consumes only 10.5mW and
achieves ±2ppm INL maximum, no missing codes at 20
bits with 104dB SNR.
The LTC2377-20 has a high speed SPI-compatible serial
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 LTC2377-20
ideally suited for a wide variety of high speed applications.
An internal oscillator sets the conversion time, easing exter-
nal timing considerations. The LTC2377-20 automatically
powers down between conversions, leading to reduced
power dissipation that scales with the sampling rate.
The LTC2377-20 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
+
10Ω
6800pF
VDD OVDD CHAIN
IN+
RDL/SDI
SDO
3300pF
LTC2377-20
SCK
10Ω
IN
6800pF
REF
BUSY
CNV
GND REF/DGC
2.5V TO 5.1V
237720 TA01
47µF
(X7R, 1210 SIZE)
SAMPLE CLOCK
VREF
For more information www.linear.com/LTC2377-20
Integral Nonlinearity vs Output Code
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
262144 524288 786432 1048576
OUTPUT CODE
237720 TA02
237720fa
1

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LTC2377-20 pdf, ピン配列
LTC2377-20
E LECTRICAL 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
VIN+
VIN
VIN+ – VIN
VCM
Absolute Input Range (IN+)
Absolute Input Range (IN)
Input Differential Voltage Range
Common-Mode Input Range
(Note 5)
(Note 5)
VIN = VIN+ – VIN
l –0.1
l –0.1
l –VREF
l VREF/2–
0.1
VREF/2
VREF + 0.1
VREF + 0.1
+VREF
VREF/2+
0.1
IIN Analog Input Leakage Current
CIN Analog Input Capacitance
Sample Mode
Hold Mode
0.01
45
5
CMRR
Input Common Mode Rejection Ratio
fIN = 250kHz
86
UNITS
V
V
V
V
µA
pF
pF
dB
C ONVERTER 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 20
Bits
No Missing Codes
l 20
Bits
Transition Noise
INL Integral Linearity Error
(Note 6)
REF/DGC = GND, (Note 6)
l –2
l –2
2.3
±0.5
±0.5
ppmRMS
2 ppm
2 ppm
DNL Differential Linearity Error
(Note 10)
l –0.5 ±0.2
0.5
ppm
BZE Bipolar Zero-Scale Error
(Note 7)
l –13
0
13
ppm
Bipolar Zero-Scale Error Drift
±7 ppb/°C
FSE Bipolar Full-Scale Error
(Note 7)
l –100 ±10
100
ppm
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
SNR
Signal-to-(Noise + Distortion) Ratio
Signal-to-Noise Ratio
THD Total Harmonic Distortion
SFDR
Spurious Free Dynamic Range
–3dB Input Bandwidth
fIN = 2kHz, VREF = 5V
fffIIINNN
=
=
=
2kHz,
2kHz,
2kHz,
VVVRRREEEFFF
=
=
=
5V
5V, REF/DGC
2.5V
=
GND
fIN = 2kHz, VREF = 5V
fIN = 2kHz, VREF = 5V, REF/DGC = GND
fIN = 2kHz, VREF = 2.5V
fIN = 2kHz, VREF = 5V
l 101
104
l 101
l 99
l 95.5
104
102
98
l –125 –115
l –125 –114
l –123 –113
l 115
128
34
dB
dB
dB
dB
dB
dB
dB
dB
MHz
Aperture Delay
500 ps
Aperture Jitter
4 ps
Transient Response
Full-Scale Step
0.5 µs
For more information www.linear.com/LTC2377-20
237720fa
3


3Pages


LTC2377-20 電子部品, 半導体
LTC2377-20
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
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
262144 524288 786432 1048576
OUTPUT CODE
237720 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
262144 524288 786432 1048576
OUTPUT CODE
237720 G02
DC Histogram
50000
45000
σ = 2.3
40000
35000
30000
25000
20000
15000
10000
5000
0
524279
524283 524287 524291
OUTPUT CODE
524295
237720 G03
128k Point FFT fS = 500ksps,
fIN = 2kHz
0
SNR = 104dB
–20 THD = –128dB
SINAD = 104dB
–40 SFDR = 132dB
–60
–80
–100
–120
–140
–160
–180
0
50 100 150 200 250
FREQUENCY (kHz)
237720 G04
SNR, SINAD vs Input Frequency
108
106
104 SNR
102
SINAD
100
98
96
94
92
0 25 50 75 100 125 150 175 200
FREQUENCY (kHz)
237720 G05
THD, Harmonics
vs Input Frequency
–90
–95
–100
THD
2ND
3RD
–105
–110
–115
–120
–125
–130
–135
–140
0
25 50 75 100 125 150 175 200
FREQUENCY (kHz)
237720 G06
SNR, SINAD vs Input Level,
fIN = 2kHz
105.0
104.5
104.0
SNR
SINAD
103.5
103.0
–40
–30 –20 –10
INPUT LEVEL (dB)
0
237720 G07
SNR, SINAD vs Reference
Voltage, fIN = 2kHz
105
104
103
102 SNR
101 SINAD
100
99
98
97
96
95
2.5
3.0 3.5 4.0 4.5 5.0
REFERENCE VOLTAGE (V)
237720 G08
THD, Harmonics vs Reference
Voltage, fIN = 2kHz
–110
–115
–120
–125
THD
3RD
–130
–135
–140
2.5
2ND
3.0 3.5 4.0 4.5 5.0
REFERENCE VOLTAGE (V)
237720 G09
6
For more information www.linear.com/LTC2377-20
237720fa

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