參數(shù)資料
型號： CS5372A-ISZR
廠商： Cirrus Logic Inc
文件頁數(shù)： 14/32頁
文件大?。?/td> 0K
描述： IC MODULATOR LP/HP 2CH 24-SSOP
標(biāo)準(zhǔn)包裝： 1,000
類型： 調(diào)制器
分辨率（位）： 24 b
采樣率（每秒）： 512k
電壓電源： 模擬和數(shù)字，雙 ±
電源電壓： ±2.5V，3.3 V ~ 5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 24-SSOP（0.209"，5.30mm 寬）
供應(yīng)商設(shè)備封裝： 24-SSOP
包裝： 帶卷 (TR)
配用： 598-1778-ND - EVALUATION BOARD FOR CS5376
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
相關(guān)PDF資料
PDF描述
M83723/78R10056 CONN PLUG 5POS STRAIGHT W/PINS
CS5371A-ISZ IC MODULATOR LP/HP 1CH 24-SSOP
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參數(shù)描述
CS5372-BS 功能描述:模數(shù)轉(zhuǎn)換器 - ADC LP High Performance Delta Sigma Mod. RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
CS5372-BSR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC LP High Performance Delta Sigma Mod. RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
CS5372-BSZ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC IC LP Hgh Prfrmnc Delta Sigma Modultr RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
CS5372-BSZR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC LP High Performance Delta Sigma Mod. RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
CS5373A 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:Low-power, High-performance Modulator and Test DAC
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