参数资料
| 型号： | LTC2379HMS-18#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 2/26页 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT SPI/SRL 16MSOP |
| 产品培训模块： | LTC2379- 18-/16-bit Fully-Differential SAR ADC Family Overview |
| 标准包装： | 37 |
| 位数： | 18 |
| 采样率（每秒）： | 1.6M |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 21.5mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 16-MSOP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个差分，双极 |
| 配用： | DC1783A-E-ND - BOARD SAR ADC LTC2379-18 |
LTC2379-18
10
237918fa
OVERVIEW
The LTC2379-18 is a low noise, low power, high speed
18-bit successive approximation register (SAR) ADC.
Operating from a single 2.5V supply, the LTC2379-18
supports a large and flexible ±VREF fully differential 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 LTC2379-18 achieves ±2LSB INL max,
no missing codes at 18 bits and 101.2dB SNR.
Fast 1.6Msps throughput with no cycle latency makes
the LTC2379-18 ideally suited for a wide variety of high
speed applications. An internal oscillator sets the con-
version time, easing external timing considerations. The
LTC2379-18 dissipates only 18mW at 1.6Msps, while an
auto power-down feature is provided to further reduce
power dissipation during inactive periods.
The LTC2379-18 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.
CONVERTER OPERATION
The LTC2379-18 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 differential analog input voltage. A rising edge
on the CNV pin initiates a conversion. During the conversion
phase, the 18-bit CDAC is sequenced through a succes-
sive approximation algorithm, effectively comparing the
sampled input with binary-weighted fractions of the refer-
ence voltage (e.g. VREF/2, VREF/4 … VREF/262144) using
the differential comparator. At the end of conversion, the
CDAC output approximates the sampled analog input. The
ADC control logic then prepares the 18-bit digital output
code for serial transfer.
APPLICATIONS INFORMATION
Figure 2. LTC2379-18 Transfer Function
INPUT VOLTAGE (V)
0V
OUTPUT
CODE
(TWO’S
COMPLEMENT)
–1
LSB
237918 F02
011...111
011...110
000...001
000...000
100...000
100...001
111...110
1
LSB
BIPOLAR
ZERO
111...111
FSR/2 – 1LSB
–FSR/2
FSR = +FS – –FS
1LSB = FSR/262144
TRANSFER FUNCTION
The LTC2379-18 digitizes the full-scale voltage of 2
× REF
into 218 levels, resulting in an LSB size of 38μV with
REF = 5V. The ideal transfer function is shown in Figure 2.
The output data is in 2’s complement format.
RON
40Ω
CIN
45pF
RON
40Ω
REF
CIN
45pF
IN+
IN–
BIAS
VOLTAGE
237918 F03
Figure 3. The Equivalent Circuit for the
Differential Analog Input of the LTC2379-18
ANALOG INPUT
The analog inputs of the LTC2379-18 are fully differential
in order to maximize the signal swing that can be digitized.
The analog inputs can be modeled by the equivalent circuit
shown in Figure 3. The diodes at the input provide ESD
protection. In the acquisition phase, each input sees ap-
proximately 45pF (CIN) from the sampling CDAC in series
with 40Ω (RON) from the on-resistance of the sampling
switch. Any unwanted signal that is common to both
inputs will be reduced by the common mode rejection of
the ADC. The inputs draw a current spike while charging
the CIN capacitors during acquisition. During conversion,
the analog inputs draw only a small leakage current.
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相关代理商/技术参数 |
参数描述 |
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| LTC2379IDE-18#PBF | 功能描述:IC ADC 18BIT SPI/SRL 16DFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| LTC2379IDE-18#PBF-ES | 制造商:Linear Technology 功能描述:18-BIT, 1.6MSPS, 101DB SNR, LO |
| LTC2379IDE-18#TRPBF | 功能描述:IC ADC 18BIT SPI/SRL 16DFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| LTC2379IDE-18#TRPBF-ES | 制造商:Linear Technology 功能描述:ADC Single SAR 1.6Msps 18-bit Serial 16-Pin DFN EP T/R |
| LTC2379IMS-18#PBF | 功能描述:IC ADC 18BIT SPI/SRL 16MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 其它有关文件:TSA1204 View All Specifications 标准包装:1 系列:- 位数:12 采样率（每秒）:20M 数据接口:并联 转换器数目:2 功率耗散（最大）:155mW 电压电源:模拟和数字 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-TQFP 供应商设备封装:48-TQFP（7x7） 包装:Digi-Reel® 输入数目和类型:4 个单端，单极；2 个差分，单极 产品目录页面:1156 (CN2011-ZH PDF) 其它名称:497-5435-6 |
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