参数资料
| 型号： | CS5371A-ISZ |
| 厂商： | Cirrus Logic Inc |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | IC MODULATOR LP/HP 1CH 24-SSOP |
| 标准包装： | 59 |
| 类型： | 调制器 |
| 分辨率（位）： | 24 b |
| 采样率（每秒）： | 512k |
| 电压电源： | 模拟和数字 |
| 电源电压： | ±2.5V，3.3 V ~ 5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
| 配用： | 598-1778-ND - EVALUATION BOARD FOR CS5376 |
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CS5371A CS5372A
DS748F3
21
7. VOLTAGE REFERENCE
The CS5371A and CS5372A modulators re-
quire a 2.500 V precision voltage reference to
be supplied to the VREF
± pins.
7.1 VREF Power Supply
To guarantee proper regulation headroom for
the voltage reference device, the voltage refer-
ence GND pin should be connected to VA- in-
stead
of
system
ground,
as
shown
in
Figure 14. This connection results in a VREF-
voltage equal to VA- and a VREF+ voltage
very near ground [(VA-) + 2.500 VREF].
Power supply inputs to the voltage reference
device should be bypassed to system ground
with 0.1
μF capacitors placed as close as pos-
sible to the power and ground pins. In addition
to 0.1
μF local bypass capacitors, at least
100
μF of bulk capacitance to system ground
should be placed on each power supply near
the voltage regulator outputs. Bypass capaci-
tors should be X7R, C0G, tantalum, or other
high-quality dielectric type.
7.2 VREF RC Filter
Technology LT1019AIS8-2.5 voltage refer-
ence yields acceptable noise levels if the out-
put is filtered with a low-pass RC filter.
A separate RC filter is required for each sys-
tem device connected to a given voltage refer-
ence output. By sharing a common RC filter,
signal-dependent sampling of the voltage ref-
erence by one system device could cause un-
wanted tones to appear in the measurement
bandwidth of another system device via com-
mon impedance coupling.
7.3 VREF PCB Routing
To minimize the possibility of outside noise
coupling into the CS5371A and CS5372A volt-
age reference input, the VREF
± traces should
be routed as a differential pair from the large
capacitor of the voltage reference RC filter.
Careful control of the voltage reference source
and return currents by routing VREF
± as a dif-
ferential pair will significantly improve immuni-
ty from external noise.
To further improve noise rejection of the
VREF
± differential route, include 0.1
μF by-
pass capacitors to system ground as close as
possible to the VREF+ and VREF- pins of the
CS5371A and CS5372A.
7.4 VREF Input Impedance
The switched-capacitor input architecture of
the VREF
± inputs results in an input imped-
ance that depends on the internal capacitor
size and the MCLK frequency. With a 15 pF in-
ternal capacitor and a 2.048 MHz MCLK, the
VREF input impedance is approximately
1 / [(2.048 MHz) x (15 pF)] = 32 k
Ω. While the
size of the internal capacitor is fixed, the volt-
10
Ω
To VREF+
+
From VA+
Regulator
2.500 V
VREF
0.1
μF
To VREF-
0.1
μF
100
μF
0.1
μF
0.1
μF
0.1
μF
100
μF
100
μF
From VA-
Regulator
Route VREF
± as a differential pair
from the 100uF RC filter capacitor
Figure 14. Voltage Reference Circuit
相关PDF资料 |
PDF描述 |
|---|---|
| M83723/72A16246 | CONN RCPT 24POS WALL MT W/PINS |
| MS27484T16A6P | CONN PLUG 6POS STRAIGHT W/PINS |
| CS5371A-ISZR | IC MODULATOR LP/HP 1CH 24-SSOP |
| MS3106A32-4P | CONN PLUG 14POS STRAIGHT W/PINS |
| MS27484T18F30P | CONN PLUG 30POS STRAIGHT W/PINS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| CS5371A-ISZR | 功能描述:模数转换器 - ADC LP High Performance Delta Sigma Mod. RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| CS5371-BS | 功能描述:模数转换器 - ADC LP High Performance Delta Sigma Mod. RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| CS5371-BSR | 功能描述:模数转换器 - ADC LP High Performance Delta Sigma Mod. RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| CS5371-BSZ | 功能描述:模数转换器 - ADC IC LP Hgh Prfrmnc Delta Sigma Modultr RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| CS5371-BSZR | 功能描述:模数转换器 - ADC LP High Performance Delta Sigma Mod. RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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