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參數資料
| 型號： | LTC2370IMS-16#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數： | 2/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT SRL/SPI 2M 16-MSOP |
| 產品培訓模塊： | LTC2369- 18-/16-bit Pseudo-Differential SAR ADC Family Overview |
| 標準包裝： | 2,500 |
| 位數： | 16 |
| 采樣率（每秒）： | 2M |
| 數據接口： | 串行，SPI? |
| 轉換器數目： | 1 |
| 功率耗散（最大）： | 22mW |
| 電壓電源： | 模擬和數字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-TFSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 16-MSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數目和類型： | 1 個偽差分，單極 |
| 配用： | DC1813A-A-ND - BOARD SAR ADC LTC2370-16 |
LTC2370-16
10
237016fa
OVERVIEW
TheLTC2370-16isalownoise,lowpower,highspeed16-bit
successive approximation register (SAR) ADC. Operating
from a single 2.5V supply, the LTC2370-16 supports a
0V to VREF pseudo-differential unipolar input range with
VREF ranging from 2.5V to 5.1V, making it ideal for high
performance applications which require a wide dynamic
range. The LTC2370-16 achieves ±0.85LSB INL max, no
missing codes at 16 bits and 94dB SNR.
Fast 2Msps throughput with no cycle latency makes the
LTC2370-16 ideally suited for a wide variety of high speed
applications.Aninternaloscillatorsetstheconversiontime,
easing external timing considerations. The LTC2370-16
dissipatesonly19mWat2Msps,whileanautopower-down
feature is provided to further reduce power dissipation
during inactive periods.
CONVERTER OPERATION
The LTC2370-16 operates in two phases. During the ac-
quisition phase, the charge redistribution capacitor D/A
converter (CDAC) is connected to the IN+ and IN– pins to
sample the pseudo-differential analog input voltage. A ris-
ing edge on the CNV pin initiates a conversion. During the
conversionphase,the16-bitCDACissequencedthrougha
successiveapproximationalgorithm,effectivelycomparing
the sampled input with binary-weighted fractions of the
referencevoltage(e.g.VREF/2,VREF/4…VREF/65536)using
the differential comparator. At the end of conversion, the
CDAC output approximates the sampled analog input. The
ADC control logic then prepares the 16-bit digital output
code for serial transfer.
TRANSFER FUNCTION
The LTC2370-16 digitizes the full-scale voltage of REF
into 216 levels, resulting in an LSB size of 76V with
REF = 5V. The ideal transfer function is shown in Figure2.
The output data is in straight binary format.
APPLICATIONS INFORMATION
Figure 2. LTC2370-16 Transfer Function
Figure 3. The Equivalent Circuit for the
Differential Analog Input of the LTC2370-16
ANALOG INPUT
TheanaloginputsoftheLTC2370-16arepseudo-differential
in order to reduce any unwanted signal that is common
to both inputs. The analog inputs can be modeled by the
equivalentcircuitshowninFigure3.Thediodesattheinput
provide ESD protection. In the acquisition phase, each
input sees approximately 45pF (CIN) from the sampling
CDAC in series with 40Ω (RON) from the on-resistance
of the sampling switch. The IN+ input draws a current
spike while charging the CIN capacitor during acquisition.
During conversion, the analog inputs draw only a small
leakage current.
INPUT VOLTAGE (V)
0V
OUTPUT
CODE
237016 F02
111...111
111...110
111...101
111...100
000...001
000...000
000...010
000...011
1
LSB
UNIPOLAR
ZERO
FS – 1LSB
1LSB = FS/65536
RON
40
CIN
45pF
RON
40
REF
CIN
45pF
IN+
IN–
BIAS
VOLTAGE
237016 F03
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