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| 型號： | AD7452BRT-R2 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/29頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 555KSPS SOT23-8 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 555k |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 7.25mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-8 |
| 供應(yīng)商設(shè)備封裝： | SOT-23-8 |
| 包裝： | 剪切帶 (CT) |
| 輸入數(shù)目和類型： | 2 個單端，單極；1 個差分，單極 |
| 其它名稱： | AD7452BRT-R2CT |
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AD7452
Rev. B | Page 13 of 28
CIRCUIT INFORMATION
The AD7452 is a 12-bit, low power, single-supply, successive
approximation analog-to-digital converter (ADC). It can
operate with a 5 V or 3 V power supply, and is capable of
throughput rates up to 555 kSPS when supplied with a 10 MHz
SCLK. It requires an external reference to be applied to the VREF
pin, with the value of the reference chosen depending on the
power supply and what suits the application.
When operated with a 5 V supply, the maximum reference that
can be applied is 3.5 V. When operated with a 3 V supply, the
maximum reference that can be applied is 2.2 V (see the
Reference section).
The AD7452 has an on-chip differential track-and-hold
amplifier, a successive approximation (SAR) ADC, and a serial
interface, housed in an 8-lead SOT-23 package. The serial clock
input accesses data from the part and provides the clock source
for the successive approximation ADC. The AD7452 features a
power-down option for reduced power consumption between
conversions. The power-down feature is implemented across the
standard serial interface as described in the Modes of Operation
section.
CONVERTER OPERATION
The AD7452 is a successive approximation ADC based around
schematics of the ADC in the acquisition and conversion phase,
respectively. The ADC is comprised of control logic, an SAR,
and two capacitive DACs. In Figure 18 (acquisition phase), SW3
is closed and SW1 and SW2 are in Position A, the comparator is
held in a balanced condition, and the sampling capacitor arrays
acquire the differential signal on the input.
VIN+
VIN–
A
B
SW1
SW3
COMPARATOR
CONTROL
LOGIC
CAPACITIVE
DAC
CAPACITIVE
DAC
CS
VREF
SW2
B
A
03154-A
-018
Figure 18. ADC Acquisition Phase
When the ADC starts a conversion (Figure 19), SW3 opens and
SW1 and SW2 move to Position B, causing the comparator to
become unbalanced. Both inputs are disconnected once the
conversion begins. The control logic and the charge redistribu-
tion DACs are used to add and subtract fixed amounts of charge
from the sampling capacitor arrays to bring the comparator
back into a balanced condition. When the comparator is
rebalanced, the conversion is complete. The control logic
generates the ADC’s output code. The output impedances of the
sources driving the VIN+ and the VIN– pins must be matched;
otherwise, the two inputs will have different settling times,
resulting in errors.
VIN+
VIN–
A
B
SW1
SW3
CONTROL
LOGIC
CAPACITIVE
DAC
CAPACITIVE
DAC
CS
VREF
SW2
B
A
03154-A
-019
COMPARATOR
Figure 19. ADC Conversion Phase
ADC TRANSFER FUNCTION
The output coding for the AD7452 is twos complement. The
designed code transitions occur at successive LSB values
(i.e., 1 LSB, 2 LSBs, and so on). The LSB size is 2 × VREF/4096.
The ideal transfer characteristic of the AD7452 is shown in
100...000
–VREF
AD
C
CO
DE
ANALOG INPUT
(VIN+ –VIN–)
011...111
100...001
000...000
000...001
111...111
1LSB
+ VREF – 1LSB
1LSB = 2
× V
REF/4096
011...110
100...010
03154-A
-020
0 LSB
Figure 20. Ideal Transfer Characteristic
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AD7452BRT-REEL | 制造商:Analog Devices 功能描述:ADC SGL SAR 555KSPS 12-BIT SERL 8PIN SOT-23 - Tape and Reel |
| AD7452BRT-REEL7 | 制造商:Analog Devices 功能描述: |
| AD7452BRTZ-R2 | 功能描述:IC ADC 12BIT 555KSPS SOT23-8 RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個單端，單極；2 個差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7452BRTZ-REEL7 | 功能描述:IC ADC 12BIT DIF 555KSPS SOT23-8 RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:480µW 電壓電源:單電源 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:38-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)目和類型:16 個單端，雙極；8 個差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494 |
| AD7453 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Pseudo Differential, 555 kSPS, 12-Bit ADC in an 8-Lead SOT-23 |
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