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參數(shù)資料
| 型號(hào)： | AD7661ASTZ |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 13/28頁(yè) |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT W/REF 48-LQFP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | PulSAR® |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 100k |
| 數(shù)據(jù)接口： | 串行，并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 25mW |
| 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-LQFP |
| 供應(yīng)商設(shè)備封裝： | 48-LQFP（7x7） |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | 2 個(gè)偽差分，單極 |
| 配用： | EVAL-AD7661CBZ-ND - BOARD EVALUATION FOR AD7661 |
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AD7661
Rev. 0 | Page 20 of 28
For applications that use multiple AD7661s, it is more effective
to use the internal buffer to buffer the reference voltage.
Care should be taken with the voltage reference’s temperature
coefficient, which directly affects the full-scale accuracy if this
parameter matters. For instance, a ±15 ppm/°C temperature
coefficient of the reference changes full scale by ±1 LSB/°C.
Note that VREF can be increased to AVDD – 1.85 V. Since the
input range is defined in terms of VREF, this would essentially
increase the range to 0 V to 3 V with an AVDD above 4.85 V.
The AD780 can be selected with a 3 V reference voltage.
The TEMP pin, which measures the temperature of the
AD7661, can be used as shown in Figure 30. The output of
TEMP pin is applied to one of the inputs of the analog switch
(e.g., ADG779), and the ADC itself is used to measure its own
temperature. This configuration is very useful for improving the
calibration accuracy over the temperature range.
ADG779
AD8021
CC
03033-0-024
ANALOG INPUT
(UNIPOLAR)
AD7661
IN
TEMPERATURE
SENSOR
TEMP
Figure 30. Temperature Sensor Connection Diagram
Power Supply
The AD7661 uses three power supply pins: an analog 5 V supply
AVDD, a digital 5 V core supply DVDD, and a digital input/
output interface supply OVDD. OVDD allows direct interface
with any logic between 2.7 V and DVDD + 0.3 V. To reduce the
supplies needed, the digital core (DVDD) can be supplied
through a simple RC filter from the analog supply, as shown in
Figure 26. The AD7661 is independent of power supply
sequencing once OVDD does not exceed DVDD by more than
0.3 V, and is thus free of supply voltage induced latch-up.
Additionally, it is very insensitive to power supply variations
over a wide frequency range, as shown in Figure 31, which
represents PSRR over frequency with on chip and external
references.
30
40
50
60
70
80
90
1
10
100
1000
10000
FREQUENCY (kHz)
P
S
RR
(dB)
03033-0-044
EXT REF
INT REF
Figure 31. PSRR vs. Frequency
POWER DISSIPATION VERSUS THROUGHPUT
Operating currents are very low during the acquisition phase,
allowing significant power savings when the conversion rate is
reduced (see Figure 32). The AD7661 automatically reduces its
power consumption at the end of each conversion phase. This
makes the part ideal for very low power battery applications.
The digital interface and the reference remain active even
during the acquisition phase. To reduce operating digital supply
currents even further, digital inputs need to be driven close to
the power supply rails (i.e., DVDD or DGND), and OVDD
should not exceed DVDD by more than 0.3 V.
SAMPLE RATE (SPS)
10
03033-0-045
100
10000
100000
1000
10000
100
1000
100000
10
POW
E
R
DISSIPATION
(
W)
PDREF = PDBUF = HIGH
Figure 32. Power Dissipation vs. Sampling Rate
相關(guān)PDF資料 |
PDF描述 |
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| AD7663ACPZ | IC ADC 16BIT CMOS 5V 48LFCSP |
| AD7664ASTZRL | IC ADC 16BIT UNIPOLAR 48LQFP |
| AD7665ACPZ | IC ADC 16BIT CMOS 5V 48LFCSP |
| AD7666ACPZ | IC ADC 16BIT UNIPOLAR 48LFCSP |
| AD7667ASTZ | IC ADC 16BIT UNIPOLAR 48-LQFP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7661ASTZ | 制造商:Analog Devices 功能描述:16BIT ADC INT REF 7661 LQFP48 |
| AD7661ASTZRL | 功能描述:IC ADC 16BIT W/REF 48LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:PulSAR® 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個(gè)單端，單極；1 個(gè)單端，雙極 |
| AD7663 | 制造商:AD 制造商全稱:Analog Devices 功能描述:16-Bit 1 MSPS SAR Unipolar ADC with Ref |
| AD7663ACP | 制造商:Analog Devices 功能描述:ADC Single SAR 250ksps 16-bit Parallel/Serial 48-Pin LFCSP EP |
| AD7663ACPRL | 制造商:Analog Devices 功能描述:ADC Single SAR 250ksps 16-bit Parallel/Serial 48-Pin LFCSP EP T/R |
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